199c55f7dSAlexei Starovoitov /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com 299c55f7dSAlexei Starovoitov * 399c55f7dSAlexei Starovoitov * This program is free software; you can redistribute it and/or 499c55f7dSAlexei Starovoitov * modify it under the terms of version 2 of the GNU General Public 599c55f7dSAlexei Starovoitov * License as published by the Free Software Foundation. 699c55f7dSAlexei Starovoitov * 799c55f7dSAlexei Starovoitov * This program is distributed in the hope that it will be useful, but 899c55f7dSAlexei Starovoitov * WITHOUT ANY WARRANTY; without even the implied warranty of 999c55f7dSAlexei Starovoitov * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 1099c55f7dSAlexei Starovoitov * General Public License for more details. 1199c55f7dSAlexei Starovoitov */ 1299c55f7dSAlexei Starovoitov #include <linux/bpf.h> 13a67edbf4SDaniel Borkmann #include <linux/bpf_trace.h> 14f4364dcfSSean Young #include <linux/bpf_lirc.h> 15f56a653cSMartin KaFai Lau #include <linux/btf.h> 1699c55f7dSAlexei Starovoitov #include <linux/syscalls.h> 1799c55f7dSAlexei Starovoitov #include <linux/slab.h> 183f07c014SIngo Molnar #include <linux/sched/signal.h> 19d407bd25SDaniel Borkmann #include <linux/vmalloc.h> 20d407bd25SDaniel Borkmann #include <linux/mmzone.h> 2199c55f7dSAlexei Starovoitov #include <linux/anon_inodes.h> 2241bdc4b4SYonghong Song #include <linux/fdtable.h> 23db20fd2bSAlexei Starovoitov #include <linux/file.h> 2441bdc4b4SYonghong Song #include <linux/fs.h> 2509756af4SAlexei Starovoitov #include <linux/license.h> 2609756af4SAlexei Starovoitov #include <linux/filter.h> 272541517cSAlexei Starovoitov #include <linux/version.h> 28535e7b4bSMickaël Salaün #include <linux/kernel.h> 29dc4bb0e2SMartin KaFai Lau #include <linux/idr.h> 30cb4d2b3fSMartin KaFai Lau #include <linux/cred.h> 31cb4d2b3fSMartin KaFai Lau #include <linux/timekeeping.h> 32cb4d2b3fSMartin KaFai Lau #include <linux/ctype.h> 339ef09e35SMark Rutland #include <linux/nospec.h> 3499c55f7dSAlexei Starovoitov 3514dc6f04SMartin KaFai Lau #define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY || \ 3614dc6f04SMartin KaFai Lau (map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \ 3714dc6f04SMartin KaFai Lau (map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \ 3814dc6f04SMartin KaFai Lau (map)->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS) 3914dc6f04SMartin KaFai Lau #define IS_FD_HASH(map) ((map)->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) 4014dc6f04SMartin KaFai Lau #define IS_FD_MAP(map) (IS_FD_ARRAY(map) || IS_FD_HASH(map)) 4114dc6f04SMartin KaFai Lau 426e71b04aSChenbo Feng #define BPF_OBJ_FLAG_MASK (BPF_F_RDONLY | BPF_F_WRONLY) 436e71b04aSChenbo Feng 44b121d1e7SAlexei Starovoitov DEFINE_PER_CPU(int, bpf_prog_active); 45dc4bb0e2SMartin KaFai Lau static DEFINE_IDR(prog_idr); 46dc4bb0e2SMartin KaFai Lau static DEFINE_SPINLOCK(prog_idr_lock); 47f3f1c054SMartin KaFai Lau static DEFINE_IDR(map_idr); 48f3f1c054SMartin KaFai Lau static DEFINE_SPINLOCK(map_idr_lock); 49b121d1e7SAlexei Starovoitov 501be7f75dSAlexei Starovoitov int sysctl_unprivileged_bpf_disabled __read_mostly; 511be7f75dSAlexei Starovoitov 5240077e0cSJohannes Berg static const struct bpf_map_ops * const bpf_map_types[] = { 5340077e0cSJohannes Berg #define BPF_PROG_TYPE(_id, _ops) 5440077e0cSJohannes Berg #define BPF_MAP_TYPE(_id, _ops) \ 5540077e0cSJohannes Berg [_id] = &_ops, 5640077e0cSJohannes Berg #include <linux/bpf_types.h> 5740077e0cSJohannes Berg #undef BPF_PROG_TYPE 5840077e0cSJohannes Berg #undef BPF_MAP_TYPE 5940077e0cSJohannes Berg }; 6099c55f7dSAlexei Starovoitov 61752ba56fSMickaël Salaün /* 62752ba56fSMickaël Salaün * If we're handed a bigger struct than we know of, ensure all the unknown bits 63752ba56fSMickaël Salaün * are 0 - i.e. new user-space does not rely on any kernel feature extensions 64752ba56fSMickaël Salaün * we don't know about yet. 65752ba56fSMickaël Salaün * 66752ba56fSMickaël Salaün * There is a ToCToU between this function call and the following 67752ba56fSMickaël Salaün * copy_from_user() call. However, this is not a concern since this function is 68752ba56fSMickaël Salaün * meant to be a future-proofing of bits. 69752ba56fSMickaël Salaün */ 70dcab51f1SMartin KaFai Lau int bpf_check_uarg_tail_zero(void __user *uaddr, 7158291a74SMickaël Salaün size_t expected_size, 7258291a74SMickaël Salaün size_t actual_size) 7358291a74SMickaël Salaün { 7458291a74SMickaël Salaün unsigned char __user *addr; 7558291a74SMickaël Salaün unsigned char __user *end; 7658291a74SMickaël Salaün unsigned char val; 7758291a74SMickaël Salaün int err; 7858291a74SMickaël Salaün 79752ba56fSMickaël Salaün if (unlikely(actual_size > PAGE_SIZE)) /* silly large */ 80752ba56fSMickaël Salaün return -E2BIG; 81752ba56fSMickaël Salaün 82752ba56fSMickaël Salaün if (unlikely(!access_ok(VERIFY_READ, uaddr, actual_size))) 83752ba56fSMickaël Salaün return -EFAULT; 84752ba56fSMickaël Salaün 8558291a74SMickaël Salaün if (actual_size <= expected_size) 8658291a74SMickaël Salaün return 0; 8758291a74SMickaël Salaün 8858291a74SMickaël Salaün addr = uaddr + expected_size; 8958291a74SMickaël Salaün end = uaddr + actual_size; 9058291a74SMickaël Salaün 9158291a74SMickaël Salaün for (; addr < end; addr++) { 9258291a74SMickaël Salaün err = get_user(val, addr); 9358291a74SMickaël Salaün if (err) 9458291a74SMickaël Salaün return err; 9558291a74SMickaël Salaün if (val) 9658291a74SMickaël Salaün return -E2BIG; 9758291a74SMickaël Salaün } 9858291a74SMickaël Salaün 9958291a74SMickaël Salaün return 0; 10058291a74SMickaël Salaün } 10158291a74SMickaël Salaün 102a3884572SJakub Kicinski const struct bpf_map_ops bpf_map_offload_ops = { 103a3884572SJakub Kicinski .map_alloc = bpf_map_offload_map_alloc, 104a3884572SJakub Kicinski .map_free = bpf_map_offload_map_free, 105e8d2bec0SDaniel Borkmann .map_check_btf = map_check_no_btf, 106a3884572SJakub Kicinski }; 107a3884572SJakub Kicinski 10899c55f7dSAlexei Starovoitov static struct bpf_map *find_and_alloc_map(union bpf_attr *attr) 10999c55f7dSAlexei Starovoitov { 1101110f3a9SJakub Kicinski const struct bpf_map_ops *ops; 1119ef09e35SMark Rutland u32 type = attr->map_type; 11299c55f7dSAlexei Starovoitov struct bpf_map *map; 1131110f3a9SJakub Kicinski int err; 11499c55f7dSAlexei Starovoitov 1159ef09e35SMark Rutland if (type >= ARRAY_SIZE(bpf_map_types)) 1161110f3a9SJakub Kicinski return ERR_PTR(-EINVAL); 1179ef09e35SMark Rutland type = array_index_nospec(type, ARRAY_SIZE(bpf_map_types)); 1189ef09e35SMark Rutland ops = bpf_map_types[type]; 1191110f3a9SJakub Kicinski if (!ops) 12040077e0cSJohannes Berg return ERR_PTR(-EINVAL); 12140077e0cSJohannes Berg 1221110f3a9SJakub Kicinski if (ops->map_alloc_check) { 1231110f3a9SJakub Kicinski err = ops->map_alloc_check(attr); 1241110f3a9SJakub Kicinski if (err) 1251110f3a9SJakub Kicinski return ERR_PTR(err); 1261110f3a9SJakub Kicinski } 127a3884572SJakub Kicinski if (attr->map_ifindex) 128a3884572SJakub Kicinski ops = &bpf_map_offload_ops; 1291110f3a9SJakub Kicinski map = ops->map_alloc(attr); 13099c55f7dSAlexei Starovoitov if (IS_ERR(map)) 13199c55f7dSAlexei Starovoitov return map; 1321110f3a9SJakub Kicinski map->ops = ops; 1339ef09e35SMark Rutland map->map_type = type; 13499c55f7dSAlexei Starovoitov return map; 13599c55f7dSAlexei Starovoitov } 13699c55f7dSAlexei Starovoitov 13796eabe7aSMartin KaFai Lau void *bpf_map_area_alloc(size_t size, int numa_node) 138d407bd25SDaniel Borkmann { 139d407bd25SDaniel Borkmann /* We definitely need __GFP_NORETRY, so OOM killer doesn't 140d407bd25SDaniel Borkmann * trigger under memory pressure as we really just want to 141d407bd25SDaniel Borkmann * fail instead. 142d407bd25SDaniel Borkmann */ 143d407bd25SDaniel Borkmann const gfp_t flags = __GFP_NOWARN | __GFP_NORETRY | __GFP_ZERO; 144d407bd25SDaniel Borkmann void *area; 145d407bd25SDaniel Borkmann 146d407bd25SDaniel Borkmann if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) { 14796eabe7aSMartin KaFai Lau area = kmalloc_node(size, GFP_USER | flags, numa_node); 148d407bd25SDaniel Borkmann if (area != NULL) 149d407bd25SDaniel Borkmann return area; 150d407bd25SDaniel Borkmann } 151d407bd25SDaniel Borkmann 15296eabe7aSMartin KaFai Lau return __vmalloc_node_flags_caller(size, numa_node, GFP_KERNEL | flags, 15396eabe7aSMartin KaFai Lau __builtin_return_address(0)); 154d407bd25SDaniel Borkmann } 155d407bd25SDaniel Borkmann 156d407bd25SDaniel Borkmann void bpf_map_area_free(void *area) 157d407bd25SDaniel Borkmann { 158d407bd25SDaniel Borkmann kvfree(area); 159d407bd25SDaniel Borkmann } 160d407bd25SDaniel Borkmann 161bd475643SJakub Kicinski void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr) 162bd475643SJakub Kicinski { 163bd475643SJakub Kicinski map->map_type = attr->map_type; 164bd475643SJakub Kicinski map->key_size = attr->key_size; 165bd475643SJakub Kicinski map->value_size = attr->value_size; 166bd475643SJakub Kicinski map->max_entries = attr->max_entries; 167bd475643SJakub Kicinski map->map_flags = attr->map_flags; 168bd475643SJakub Kicinski map->numa_node = bpf_map_attr_numa_node(attr); 169bd475643SJakub Kicinski } 170bd475643SJakub Kicinski 1716c905981SAlexei Starovoitov int bpf_map_precharge_memlock(u32 pages) 1726c905981SAlexei Starovoitov { 1736c905981SAlexei Starovoitov struct user_struct *user = get_current_user(); 1746c905981SAlexei Starovoitov unsigned long memlock_limit, cur; 1756c905981SAlexei Starovoitov 1766c905981SAlexei Starovoitov memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; 1776c905981SAlexei Starovoitov cur = atomic_long_read(&user->locked_vm); 1786c905981SAlexei Starovoitov free_uid(user); 1796c905981SAlexei Starovoitov if (cur + pages > memlock_limit) 1806c905981SAlexei Starovoitov return -EPERM; 1816c905981SAlexei Starovoitov return 0; 1826c905981SAlexei Starovoitov } 1836c905981SAlexei Starovoitov 1840a4c58f5SRoman Gushchin static int bpf_charge_memlock(struct user_struct *user, u32 pages) 185aaac3ba9SAlexei Starovoitov { 1860a4c58f5SRoman Gushchin unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; 187aaac3ba9SAlexei Starovoitov 1880a4c58f5SRoman Gushchin if (atomic_long_add_return(pages, &user->locked_vm) > memlock_limit) { 1890a4c58f5SRoman Gushchin atomic_long_sub(pages, &user->locked_vm); 190aaac3ba9SAlexei Starovoitov return -EPERM; 191aaac3ba9SAlexei Starovoitov } 192aaac3ba9SAlexei Starovoitov return 0; 193aaac3ba9SAlexei Starovoitov } 194aaac3ba9SAlexei Starovoitov 1950a4c58f5SRoman Gushchin static void bpf_uncharge_memlock(struct user_struct *user, u32 pages) 1960a4c58f5SRoman Gushchin { 1970a4c58f5SRoman Gushchin atomic_long_sub(pages, &user->locked_vm); 1980a4c58f5SRoman Gushchin } 1990a4c58f5SRoman Gushchin 2000a4c58f5SRoman Gushchin static int bpf_map_init_memlock(struct bpf_map *map) 2010a4c58f5SRoman Gushchin { 2020a4c58f5SRoman Gushchin struct user_struct *user = get_current_user(); 2030a4c58f5SRoman Gushchin int ret; 2040a4c58f5SRoman Gushchin 2050a4c58f5SRoman Gushchin ret = bpf_charge_memlock(user, map->pages); 2060a4c58f5SRoman Gushchin if (ret) { 2070a4c58f5SRoman Gushchin free_uid(user); 2080a4c58f5SRoman Gushchin return ret; 2090a4c58f5SRoman Gushchin } 2100a4c58f5SRoman Gushchin map->user = user; 2110a4c58f5SRoman Gushchin return ret; 2120a4c58f5SRoman Gushchin } 2130a4c58f5SRoman Gushchin 2140a4c58f5SRoman Gushchin static void bpf_map_release_memlock(struct bpf_map *map) 215aaac3ba9SAlexei Starovoitov { 216aaac3ba9SAlexei Starovoitov struct user_struct *user = map->user; 2170a4c58f5SRoman Gushchin bpf_uncharge_memlock(user, map->pages); 218aaac3ba9SAlexei Starovoitov free_uid(user); 219aaac3ba9SAlexei Starovoitov } 220aaac3ba9SAlexei Starovoitov 2210a4c58f5SRoman Gushchin int bpf_map_charge_memlock(struct bpf_map *map, u32 pages) 2220a4c58f5SRoman Gushchin { 2230a4c58f5SRoman Gushchin int ret; 2240a4c58f5SRoman Gushchin 2250a4c58f5SRoman Gushchin ret = bpf_charge_memlock(map->user, pages); 2260a4c58f5SRoman Gushchin if (ret) 2270a4c58f5SRoman Gushchin return ret; 2280a4c58f5SRoman Gushchin map->pages += pages; 2290a4c58f5SRoman Gushchin return ret; 2300a4c58f5SRoman Gushchin } 2310a4c58f5SRoman Gushchin 2320a4c58f5SRoman Gushchin void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages) 2330a4c58f5SRoman Gushchin { 2340a4c58f5SRoman Gushchin bpf_uncharge_memlock(map->user, pages); 2350a4c58f5SRoman Gushchin map->pages -= pages; 2360a4c58f5SRoman Gushchin } 2370a4c58f5SRoman Gushchin 238f3f1c054SMartin KaFai Lau static int bpf_map_alloc_id(struct bpf_map *map) 239f3f1c054SMartin KaFai Lau { 240f3f1c054SMartin KaFai Lau int id; 241f3f1c054SMartin KaFai Lau 242b76354cdSShaohua Li idr_preload(GFP_KERNEL); 243f3f1c054SMartin KaFai Lau spin_lock_bh(&map_idr_lock); 244f3f1c054SMartin KaFai Lau id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC); 245f3f1c054SMartin KaFai Lau if (id > 0) 246f3f1c054SMartin KaFai Lau map->id = id; 247f3f1c054SMartin KaFai Lau spin_unlock_bh(&map_idr_lock); 248b76354cdSShaohua Li idr_preload_end(); 249f3f1c054SMartin KaFai Lau 250f3f1c054SMartin KaFai Lau if (WARN_ON_ONCE(!id)) 251f3f1c054SMartin KaFai Lau return -ENOSPC; 252f3f1c054SMartin KaFai Lau 253f3f1c054SMartin KaFai Lau return id > 0 ? 0 : id; 254f3f1c054SMartin KaFai Lau } 255f3f1c054SMartin KaFai Lau 256a3884572SJakub Kicinski void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock) 257f3f1c054SMartin KaFai Lau { 258930651a7SEric Dumazet unsigned long flags; 259930651a7SEric Dumazet 260a3884572SJakub Kicinski /* Offloaded maps are removed from the IDR store when their device 261a3884572SJakub Kicinski * disappears - even if someone holds an fd to them they are unusable, 262a3884572SJakub Kicinski * the memory is gone, all ops will fail; they are simply waiting for 263a3884572SJakub Kicinski * refcnt to drop to be freed. 264a3884572SJakub Kicinski */ 265a3884572SJakub Kicinski if (!map->id) 266a3884572SJakub Kicinski return; 267a3884572SJakub Kicinski 268bd5f5f4eSMartin KaFai Lau if (do_idr_lock) 269930651a7SEric Dumazet spin_lock_irqsave(&map_idr_lock, flags); 270bd5f5f4eSMartin KaFai Lau else 271bd5f5f4eSMartin KaFai Lau __acquire(&map_idr_lock); 272bd5f5f4eSMartin KaFai Lau 273f3f1c054SMartin KaFai Lau idr_remove(&map_idr, map->id); 274a3884572SJakub Kicinski map->id = 0; 275bd5f5f4eSMartin KaFai Lau 276bd5f5f4eSMartin KaFai Lau if (do_idr_lock) 277930651a7SEric Dumazet spin_unlock_irqrestore(&map_idr_lock, flags); 278bd5f5f4eSMartin KaFai Lau else 279bd5f5f4eSMartin KaFai Lau __release(&map_idr_lock); 280f3f1c054SMartin KaFai Lau } 281f3f1c054SMartin KaFai Lau 28299c55f7dSAlexei Starovoitov /* called from workqueue */ 28399c55f7dSAlexei Starovoitov static void bpf_map_free_deferred(struct work_struct *work) 28499c55f7dSAlexei Starovoitov { 28599c55f7dSAlexei Starovoitov struct bpf_map *map = container_of(work, struct bpf_map, work); 28699c55f7dSAlexei Starovoitov 2870a4c58f5SRoman Gushchin bpf_map_release_memlock(map); 288afdb09c7SChenbo Feng security_bpf_map_free(map); 28999c55f7dSAlexei Starovoitov /* implementation dependent freeing */ 29099c55f7dSAlexei Starovoitov map->ops->map_free(map); 29199c55f7dSAlexei Starovoitov } 29299c55f7dSAlexei Starovoitov 293c9da161cSDaniel Borkmann static void bpf_map_put_uref(struct bpf_map *map) 294c9da161cSDaniel Borkmann { 295c9da161cSDaniel Borkmann if (atomic_dec_and_test(&map->usercnt)) { 296ba6b8de4SJohn Fastabend if (map->ops->map_release_uref) 297ba6b8de4SJohn Fastabend map->ops->map_release_uref(map); 298c9da161cSDaniel Borkmann } 299c9da161cSDaniel Borkmann } 300c9da161cSDaniel Borkmann 30199c55f7dSAlexei Starovoitov /* decrement map refcnt and schedule it for freeing via workqueue 30299c55f7dSAlexei Starovoitov * (unrelying map implementation ops->map_free() might sleep) 30399c55f7dSAlexei Starovoitov */ 304bd5f5f4eSMartin KaFai Lau static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock) 30599c55f7dSAlexei Starovoitov { 30699c55f7dSAlexei Starovoitov if (atomic_dec_and_test(&map->refcnt)) { 30734ad5580SMartin KaFai Lau /* bpf_map_free_id() must be called first */ 308bd5f5f4eSMartin KaFai Lau bpf_map_free_id(map, do_idr_lock); 30978958fcaSMartin KaFai Lau btf_put(map->btf); 31099c55f7dSAlexei Starovoitov INIT_WORK(&map->work, bpf_map_free_deferred); 31199c55f7dSAlexei Starovoitov schedule_work(&map->work); 31299c55f7dSAlexei Starovoitov } 31399c55f7dSAlexei Starovoitov } 31499c55f7dSAlexei Starovoitov 315bd5f5f4eSMartin KaFai Lau void bpf_map_put(struct bpf_map *map) 316bd5f5f4eSMartin KaFai Lau { 317bd5f5f4eSMartin KaFai Lau __bpf_map_put(map, true); 318bd5f5f4eSMartin KaFai Lau } 319630a4d38SJakub Kicinski EXPORT_SYMBOL_GPL(bpf_map_put); 320bd5f5f4eSMartin KaFai Lau 321c9da161cSDaniel Borkmann void bpf_map_put_with_uref(struct bpf_map *map) 322c9da161cSDaniel Borkmann { 323c9da161cSDaniel Borkmann bpf_map_put_uref(map); 324c9da161cSDaniel Borkmann bpf_map_put(map); 325c9da161cSDaniel Borkmann } 326c9da161cSDaniel Borkmann 32799c55f7dSAlexei Starovoitov static int bpf_map_release(struct inode *inode, struct file *filp) 32899c55f7dSAlexei Starovoitov { 32961d1b6a4SDaniel Borkmann struct bpf_map *map = filp->private_data; 33061d1b6a4SDaniel Borkmann 33161d1b6a4SDaniel Borkmann if (map->ops->map_release) 33261d1b6a4SDaniel Borkmann map->ops->map_release(map, filp); 33361d1b6a4SDaniel Borkmann 33461d1b6a4SDaniel Borkmann bpf_map_put_with_uref(map); 33599c55f7dSAlexei Starovoitov return 0; 33699c55f7dSAlexei Starovoitov } 33799c55f7dSAlexei Starovoitov 338f99bf205SDaniel Borkmann #ifdef CONFIG_PROC_FS 339f99bf205SDaniel Borkmann static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp) 340f99bf205SDaniel Borkmann { 341f99bf205SDaniel Borkmann const struct bpf_map *map = filp->private_data; 34221116b70SDaniel Borkmann const struct bpf_array *array; 34321116b70SDaniel Borkmann u32 owner_prog_type = 0; 3449780c0abSDaniel Borkmann u32 owner_jited = 0; 34521116b70SDaniel Borkmann 34621116b70SDaniel Borkmann if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) { 34721116b70SDaniel Borkmann array = container_of(map, struct bpf_array, map); 34821116b70SDaniel Borkmann owner_prog_type = array->owner_prog_type; 3499780c0abSDaniel Borkmann owner_jited = array->owner_jited; 35021116b70SDaniel Borkmann } 351f99bf205SDaniel Borkmann 352f99bf205SDaniel Borkmann seq_printf(m, 353f99bf205SDaniel Borkmann "map_type:\t%u\n" 354f99bf205SDaniel Borkmann "key_size:\t%u\n" 355f99bf205SDaniel Borkmann "value_size:\t%u\n" 356322cea2fSDaniel Borkmann "max_entries:\t%u\n" 35721116b70SDaniel Borkmann "map_flags:\t%#x\n" 3584316b409SDaniel Borkmann "memlock:\t%llu\n" 3594316b409SDaniel Borkmann "map_id:\t%u\n", 360f99bf205SDaniel Borkmann map->map_type, 361f99bf205SDaniel Borkmann map->key_size, 362f99bf205SDaniel Borkmann map->value_size, 363322cea2fSDaniel Borkmann map->max_entries, 36421116b70SDaniel Borkmann map->map_flags, 3654316b409SDaniel Borkmann map->pages * 1ULL << PAGE_SHIFT, 3664316b409SDaniel Borkmann map->id); 36721116b70SDaniel Borkmann 3689780c0abSDaniel Borkmann if (owner_prog_type) { 36921116b70SDaniel Borkmann seq_printf(m, "owner_prog_type:\t%u\n", 37021116b70SDaniel Borkmann owner_prog_type); 3719780c0abSDaniel Borkmann seq_printf(m, "owner_jited:\t%u\n", 3729780c0abSDaniel Borkmann owner_jited); 3739780c0abSDaniel Borkmann } 374f99bf205SDaniel Borkmann } 375f99bf205SDaniel Borkmann #endif 376f99bf205SDaniel Borkmann 3776e71b04aSChenbo Feng static ssize_t bpf_dummy_read(struct file *filp, char __user *buf, size_t siz, 3786e71b04aSChenbo Feng loff_t *ppos) 3796e71b04aSChenbo Feng { 3806e71b04aSChenbo Feng /* We need this handler such that alloc_file() enables 3816e71b04aSChenbo Feng * f_mode with FMODE_CAN_READ. 3826e71b04aSChenbo Feng */ 3836e71b04aSChenbo Feng return -EINVAL; 3846e71b04aSChenbo Feng } 3856e71b04aSChenbo Feng 3866e71b04aSChenbo Feng static ssize_t bpf_dummy_write(struct file *filp, const char __user *buf, 3876e71b04aSChenbo Feng size_t siz, loff_t *ppos) 3886e71b04aSChenbo Feng { 3896e71b04aSChenbo Feng /* We need this handler such that alloc_file() enables 3906e71b04aSChenbo Feng * f_mode with FMODE_CAN_WRITE. 3916e71b04aSChenbo Feng */ 3926e71b04aSChenbo Feng return -EINVAL; 3936e71b04aSChenbo Feng } 3946e71b04aSChenbo Feng 395f66e448cSChenbo Feng const struct file_operations bpf_map_fops = { 396f99bf205SDaniel Borkmann #ifdef CONFIG_PROC_FS 397f99bf205SDaniel Borkmann .show_fdinfo = bpf_map_show_fdinfo, 398f99bf205SDaniel Borkmann #endif 39999c55f7dSAlexei Starovoitov .release = bpf_map_release, 4006e71b04aSChenbo Feng .read = bpf_dummy_read, 4016e71b04aSChenbo Feng .write = bpf_dummy_write, 40299c55f7dSAlexei Starovoitov }; 40399c55f7dSAlexei Starovoitov 4046e71b04aSChenbo Feng int bpf_map_new_fd(struct bpf_map *map, int flags) 405aa79781bSDaniel Borkmann { 406afdb09c7SChenbo Feng int ret; 407afdb09c7SChenbo Feng 408afdb09c7SChenbo Feng ret = security_bpf_map(map, OPEN_FMODE(flags)); 409afdb09c7SChenbo Feng if (ret < 0) 410afdb09c7SChenbo Feng return ret; 411afdb09c7SChenbo Feng 412aa79781bSDaniel Borkmann return anon_inode_getfd("bpf-map", &bpf_map_fops, map, 4136e71b04aSChenbo Feng flags | O_CLOEXEC); 4146e71b04aSChenbo Feng } 4156e71b04aSChenbo Feng 4166e71b04aSChenbo Feng int bpf_get_file_flag(int flags) 4176e71b04aSChenbo Feng { 4186e71b04aSChenbo Feng if ((flags & BPF_F_RDONLY) && (flags & BPF_F_WRONLY)) 4196e71b04aSChenbo Feng return -EINVAL; 4206e71b04aSChenbo Feng if (flags & BPF_F_RDONLY) 4216e71b04aSChenbo Feng return O_RDONLY; 4226e71b04aSChenbo Feng if (flags & BPF_F_WRONLY) 4236e71b04aSChenbo Feng return O_WRONLY; 4246e71b04aSChenbo Feng return O_RDWR; 425aa79781bSDaniel Borkmann } 426aa79781bSDaniel Borkmann 42799c55f7dSAlexei Starovoitov /* helper macro to check that unused fields 'union bpf_attr' are zero */ 42899c55f7dSAlexei Starovoitov #define CHECK_ATTR(CMD) \ 42999c55f7dSAlexei Starovoitov memchr_inv((void *) &attr->CMD##_LAST_FIELD + \ 43099c55f7dSAlexei Starovoitov sizeof(attr->CMD##_LAST_FIELD), 0, \ 43199c55f7dSAlexei Starovoitov sizeof(*attr) - \ 43299c55f7dSAlexei Starovoitov offsetof(union bpf_attr, CMD##_LAST_FIELD) - \ 43399c55f7dSAlexei Starovoitov sizeof(attr->CMD##_LAST_FIELD)) != NULL 43499c55f7dSAlexei Starovoitov 435cb4d2b3fSMartin KaFai Lau /* dst and src must have at least BPF_OBJ_NAME_LEN number of bytes. 436cb4d2b3fSMartin KaFai Lau * Return 0 on success and < 0 on error. 437cb4d2b3fSMartin KaFai Lau */ 438cb4d2b3fSMartin KaFai Lau static int bpf_obj_name_cpy(char *dst, const char *src) 439cb4d2b3fSMartin KaFai Lau { 440cb4d2b3fSMartin KaFai Lau const char *end = src + BPF_OBJ_NAME_LEN; 441cb4d2b3fSMartin KaFai Lau 442473d9734SMartin KaFai Lau memset(dst, 0, BPF_OBJ_NAME_LEN); 443473d9734SMartin KaFai Lau 444cb4d2b3fSMartin KaFai Lau /* Copy all isalnum() and '_' char */ 445cb4d2b3fSMartin KaFai Lau while (src < end && *src) { 446cb4d2b3fSMartin KaFai Lau if (!isalnum(*src) && *src != '_') 447cb4d2b3fSMartin KaFai Lau return -EINVAL; 448cb4d2b3fSMartin KaFai Lau *dst++ = *src++; 449cb4d2b3fSMartin KaFai Lau } 450cb4d2b3fSMartin KaFai Lau 451cb4d2b3fSMartin KaFai Lau /* No '\0' found in BPF_OBJ_NAME_LEN number of bytes */ 452cb4d2b3fSMartin KaFai Lau if (src == end) 453cb4d2b3fSMartin KaFai Lau return -EINVAL; 454cb4d2b3fSMartin KaFai Lau 455cb4d2b3fSMartin KaFai Lau return 0; 456cb4d2b3fSMartin KaFai Lau } 457cb4d2b3fSMartin KaFai Lau 458e8d2bec0SDaniel Borkmann int map_check_no_btf(const struct bpf_map *map, 459e8d2bec0SDaniel Borkmann const struct btf_type *key_type, 460e8d2bec0SDaniel Borkmann const struct btf_type *value_type) 461e8d2bec0SDaniel Borkmann { 462e8d2bec0SDaniel Borkmann return -ENOTSUPP; 463e8d2bec0SDaniel Borkmann } 464e8d2bec0SDaniel Borkmann 465e8d2bec0SDaniel Borkmann static int map_check_btf(const struct bpf_map *map, const struct btf *btf, 466e8d2bec0SDaniel Borkmann u32 btf_key_id, u32 btf_value_id) 467e8d2bec0SDaniel Borkmann { 468e8d2bec0SDaniel Borkmann const struct btf_type *key_type, *value_type; 469e8d2bec0SDaniel Borkmann u32 key_size, value_size; 470e8d2bec0SDaniel Borkmann int ret = 0; 471e8d2bec0SDaniel Borkmann 472e8d2bec0SDaniel Borkmann key_type = btf_type_id_size(btf, &btf_key_id, &key_size); 473e8d2bec0SDaniel Borkmann if (!key_type || key_size != map->key_size) 474e8d2bec0SDaniel Borkmann return -EINVAL; 475e8d2bec0SDaniel Borkmann 476e8d2bec0SDaniel Borkmann value_type = btf_type_id_size(btf, &btf_value_id, &value_size); 477e8d2bec0SDaniel Borkmann if (!value_type || value_size != map->value_size) 478e8d2bec0SDaniel Borkmann return -EINVAL; 479e8d2bec0SDaniel Borkmann 480e8d2bec0SDaniel Borkmann if (map->ops->map_check_btf) 481e8d2bec0SDaniel Borkmann ret = map->ops->map_check_btf(map, key_type, value_type); 482e8d2bec0SDaniel Borkmann 483e8d2bec0SDaniel Borkmann return ret; 484e8d2bec0SDaniel Borkmann } 485e8d2bec0SDaniel Borkmann 4869b2cf328SMartin KaFai Lau #define BPF_MAP_CREATE_LAST_FIELD btf_value_type_id 48799c55f7dSAlexei Starovoitov /* called via syscall */ 48899c55f7dSAlexei Starovoitov static int map_create(union bpf_attr *attr) 48999c55f7dSAlexei Starovoitov { 49096eabe7aSMartin KaFai Lau int numa_node = bpf_map_attr_numa_node(attr); 49199c55f7dSAlexei Starovoitov struct bpf_map *map; 4926e71b04aSChenbo Feng int f_flags; 49399c55f7dSAlexei Starovoitov int err; 49499c55f7dSAlexei Starovoitov 49599c55f7dSAlexei Starovoitov err = CHECK_ATTR(BPF_MAP_CREATE); 49699c55f7dSAlexei Starovoitov if (err) 49799c55f7dSAlexei Starovoitov return -EINVAL; 49899c55f7dSAlexei Starovoitov 4996e71b04aSChenbo Feng f_flags = bpf_get_file_flag(attr->map_flags); 5006e71b04aSChenbo Feng if (f_flags < 0) 5016e71b04aSChenbo Feng return f_flags; 5026e71b04aSChenbo Feng 50396eabe7aSMartin KaFai Lau if (numa_node != NUMA_NO_NODE && 50496e5ae4eSEric Dumazet ((unsigned int)numa_node >= nr_node_ids || 50596e5ae4eSEric Dumazet !node_online(numa_node))) 50696eabe7aSMartin KaFai Lau return -EINVAL; 50796eabe7aSMartin KaFai Lau 50899c55f7dSAlexei Starovoitov /* find map type and init map: hashtable vs rbtree vs bloom vs ... */ 50999c55f7dSAlexei Starovoitov map = find_and_alloc_map(attr); 51099c55f7dSAlexei Starovoitov if (IS_ERR(map)) 51199c55f7dSAlexei Starovoitov return PTR_ERR(map); 51299c55f7dSAlexei Starovoitov 513ad5b177bSMartin KaFai Lau err = bpf_obj_name_cpy(map->name, attr->map_name); 514ad5b177bSMartin KaFai Lau if (err) 515ad5b177bSMartin KaFai Lau goto free_map_nouncharge; 516ad5b177bSMartin KaFai Lau 51799c55f7dSAlexei Starovoitov atomic_set(&map->refcnt, 1); 518c9da161cSDaniel Borkmann atomic_set(&map->usercnt, 1); 51999c55f7dSAlexei Starovoitov 520e8d2bec0SDaniel Borkmann if (attr->btf_key_type_id || attr->btf_value_type_id) { 521a26ca7c9SMartin KaFai Lau struct btf *btf; 522a26ca7c9SMartin KaFai Lau 5239b2cf328SMartin KaFai Lau if (!attr->btf_key_type_id || !attr->btf_value_type_id) { 524a26ca7c9SMartin KaFai Lau err = -EINVAL; 525a26ca7c9SMartin KaFai Lau goto free_map_nouncharge; 526a26ca7c9SMartin KaFai Lau } 527a26ca7c9SMartin KaFai Lau 528a26ca7c9SMartin KaFai Lau btf = btf_get_by_fd(attr->btf_fd); 529a26ca7c9SMartin KaFai Lau if (IS_ERR(btf)) { 530a26ca7c9SMartin KaFai Lau err = PTR_ERR(btf); 531a26ca7c9SMartin KaFai Lau goto free_map_nouncharge; 532a26ca7c9SMartin KaFai Lau } 533a26ca7c9SMartin KaFai Lau 534e8d2bec0SDaniel Borkmann err = map_check_btf(map, btf, attr->btf_key_type_id, 5359b2cf328SMartin KaFai Lau attr->btf_value_type_id); 536a26ca7c9SMartin KaFai Lau if (err) { 537a26ca7c9SMartin KaFai Lau btf_put(btf); 538a26ca7c9SMartin KaFai Lau goto free_map_nouncharge; 539a26ca7c9SMartin KaFai Lau } 540a26ca7c9SMartin KaFai Lau 541a26ca7c9SMartin KaFai Lau map->btf = btf; 5429b2cf328SMartin KaFai Lau map->btf_key_type_id = attr->btf_key_type_id; 5439b2cf328SMartin KaFai Lau map->btf_value_type_id = attr->btf_value_type_id; 544a26ca7c9SMartin KaFai Lau } 545a26ca7c9SMartin KaFai Lau 546afdb09c7SChenbo Feng err = security_bpf_map_alloc(map); 547aaac3ba9SAlexei Starovoitov if (err) 54820b2b24fSDaniel Borkmann goto free_map_nouncharge; 549aaac3ba9SAlexei Starovoitov 5500a4c58f5SRoman Gushchin err = bpf_map_init_memlock(map); 551afdb09c7SChenbo Feng if (err) 552afdb09c7SChenbo Feng goto free_map_sec; 553afdb09c7SChenbo Feng 554f3f1c054SMartin KaFai Lau err = bpf_map_alloc_id(map); 555f3f1c054SMartin KaFai Lau if (err) 556f3f1c054SMartin KaFai Lau goto free_map; 557f3f1c054SMartin KaFai Lau 5586e71b04aSChenbo Feng err = bpf_map_new_fd(map, f_flags); 559bd5f5f4eSMartin KaFai Lau if (err < 0) { 560bd5f5f4eSMartin KaFai Lau /* failed to allocate fd. 561bd5f5f4eSMartin KaFai Lau * bpf_map_put() is needed because the above 562bd5f5f4eSMartin KaFai Lau * bpf_map_alloc_id() has published the map 563bd5f5f4eSMartin KaFai Lau * to the userspace and the userspace may 564bd5f5f4eSMartin KaFai Lau * have refcnt-ed it through BPF_MAP_GET_FD_BY_ID. 565bd5f5f4eSMartin KaFai Lau */ 566bd5f5f4eSMartin KaFai Lau bpf_map_put(map); 567bd5f5f4eSMartin KaFai Lau return err; 568bd5f5f4eSMartin KaFai Lau } 56999c55f7dSAlexei Starovoitov 57099c55f7dSAlexei Starovoitov return err; 57199c55f7dSAlexei Starovoitov 57299c55f7dSAlexei Starovoitov free_map: 5730a4c58f5SRoman Gushchin bpf_map_release_memlock(map); 574afdb09c7SChenbo Feng free_map_sec: 575afdb09c7SChenbo Feng security_bpf_map_free(map); 57620b2b24fSDaniel Borkmann free_map_nouncharge: 577a26ca7c9SMartin KaFai Lau btf_put(map->btf); 57899c55f7dSAlexei Starovoitov map->ops->map_free(map); 57999c55f7dSAlexei Starovoitov return err; 58099c55f7dSAlexei Starovoitov } 58199c55f7dSAlexei Starovoitov 582db20fd2bSAlexei Starovoitov /* if error is returned, fd is released. 583db20fd2bSAlexei Starovoitov * On success caller should complete fd access with matching fdput() 584db20fd2bSAlexei Starovoitov */ 585c2101297SDaniel Borkmann struct bpf_map *__bpf_map_get(struct fd f) 586db20fd2bSAlexei Starovoitov { 587db20fd2bSAlexei Starovoitov if (!f.file) 588db20fd2bSAlexei Starovoitov return ERR_PTR(-EBADF); 589db20fd2bSAlexei Starovoitov if (f.file->f_op != &bpf_map_fops) { 590db20fd2bSAlexei Starovoitov fdput(f); 591db20fd2bSAlexei Starovoitov return ERR_PTR(-EINVAL); 592db20fd2bSAlexei Starovoitov } 593db20fd2bSAlexei Starovoitov 594c2101297SDaniel Borkmann return f.file->private_data; 595c2101297SDaniel Borkmann } 596c2101297SDaniel Borkmann 59792117d84SAlexei Starovoitov /* prog's and map's refcnt limit */ 59892117d84SAlexei Starovoitov #define BPF_MAX_REFCNT 32768 59992117d84SAlexei Starovoitov 60092117d84SAlexei Starovoitov struct bpf_map *bpf_map_inc(struct bpf_map *map, bool uref) 601c9da161cSDaniel Borkmann { 60292117d84SAlexei Starovoitov if (atomic_inc_return(&map->refcnt) > BPF_MAX_REFCNT) { 60392117d84SAlexei Starovoitov atomic_dec(&map->refcnt); 60492117d84SAlexei Starovoitov return ERR_PTR(-EBUSY); 60592117d84SAlexei Starovoitov } 606c9da161cSDaniel Borkmann if (uref) 607c9da161cSDaniel Borkmann atomic_inc(&map->usercnt); 60892117d84SAlexei Starovoitov return map; 609c9da161cSDaniel Borkmann } 610630a4d38SJakub Kicinski EXPORT_SYMBOL_GPL(bpf_map_inc); 611c9da161cSDaniel Borkmann 612c9da161cSDaniel Borkmann struct bpf_map *bpf_map_get_with_uref(u32 ufd) 613c2101297SDaniel Borkmann { 614c2101297SDaniel Borkmann struct fd f = fdget(ufd); 615c2101297SDaniel Borkmann struct bpf_map *map; 616c2101297SDaniel Borkmann 617c2101297SDaniel Borkmann map = __bpf_map_get(f); 618c2101297SDaniel Borkmann if (IS_ERR(map)) 619c2101297SDaniel Borkmann return map; 620c2101297SDaniel Borkmann 62192117d84SAlexei Starovoitov map = bpf_map_inc(map, true); 622c2101297SDaniel Borkmann fdput(f); 623db20fd2bSAlexei Starovoitov 624db20fd2bSAlexei Starovoitov return map; 625db20fd2bSAlexei Starovoitov } 626db20fd2bSAlexei Starovoitov 627bd5f5f4eSMartin KaFai Lau /* map_idr_lock should have been held */ 628bd5f5f4eSMartin KaFai Lau static struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map, 629bd5f5f4eSMartin KaFai Lau bool uref) 630bd5f5f4eSMartin KaFai Lau { 631bd5f5f4eSMartin KaFai Lau int refold; 632bd5f5f4eSMartin KaFai Lau 633bfc18e38SMark Rutland refold = atomic_fetch_add_unless(&map->refcnt, 1, 0); 634bd5f5f4eSMartin KaFai Lau 635bd5f5f4eSMartin KaFai Lau if (refold >= BPF_MAX_REFCNT) { 636bd5f5f4eSMartin KaFai Lau __bpf_map_put(map, false); 637bd5f5f4eSMartin KaFai Lau return ERR_PTR(-EBUSY); 638bd5f5f4eSMartin KaFai Lau } 639bd5f5f4eSMartin KaFai Lau 640bd5f5f4eSMartin KaFai Lau if (!refold) 641bd5f5f4eSMartin KaFai Lau return ERR_PTR(-ENOENT); 642bd5f5f4eSMartin KaFai Lau 643bd5f5f4eSMartin KaFai Lau if (uref) 644bd5f5f4eSMartin KaFai Lau atomic_inc(&map->usercnt); 645bd5f5f4eSMartin KaFai Lau 646bd5f5f4eSMartin KaFai Lau return map; 647bd5f5f4eSMartin KaFai Lau } 648bd5f5f4eSMartin KaFai Lau 649b8cdc051SAlexei Starovoitov int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value) 650b8cdc051SAlexei Starovoitov { 651b8cdc051SAlexei Starovoitov return -ENOTSUPP; 652b8cdc051SAlexei Starovoitov } 653b8cdc051SAlexei Starovoitov 654c9d29f46SMauricio Vasquez B static void *__bpf_copy_key(void __user *ukey, u64 key_size) 655c9d29f46SMauricio Vasquez B { 656c9d29f46SMauricio Vasquez B if (key_size) 657c9d29f46SMauricio Vasquez B return memdup_user(ukey, key_size); 658c9d29f46SMauricio Vasquez B 659c9d29f46SMauricio Vasquez B if (ukey) 660c9d29f46SMauricio Vasquez B return ERR_PTR(-EINVAL); 661c9d29f46SMauricio Vasquez B 662c9d29f46SMauricio Vasquez B return NULL; 663c9d29f46SMauricio Vasquez B } 664c9d29f46SMauricio Vasquez B 665db20fd2bSAlexei Starovoitov /* last field in 'union bpf_attr' used by this command */ 666db20fd2bSAlexei Starovoitov #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD value 667db20fd2bSAlexei Starovoitov 668db20fd2bSAlexei Starovoitov static int map_lookup_elem(union bpf_attr *attr) 669db20fd2bSAlexei Starovoitov { 670535e7b4bSMickaël Salaün void __user *ukey = u64_to_user_ptr(attr->key); 671535e7b4bSMickaël Salaün void __user *uvalue = u64_to_user_ptr(attr->value); 672db20fd2bSAlexei Starovoitov int ufd = attr->map_fd; 673db20fd2bSAlexei Starovoitov struct bpf_map *map; 6748ebe667cSAlexei Starovoitov void *key, *value, *ptr; 67515a07b33SAlexei Starovoitov u32 value_size; 676592867bfSDaniel Borkmann struct fd f; 677db20fd2bSAlexei Starovoitov int err; 678db20fd2bSAlexei Starovoitov 679db20fd2bSAlexei Starovoitov if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM)) 680db20fd2bSAlexei Starovoitov return -EINVAL; 681db20fd2bSAlexei Starovoitov 682592867bfSDaniel Borkmann f = fdget(ufd); 683c2101297SDaniel Borkmann map = __bpf_map_get(f); 684db20fd2bSAlexei Starovoitov if (IS_ERR(map)) 685db20fd2bSAlexei Starovoitov return PTR_ERR(map); 686db20fd2bSAlexei Starovoitov 6876e71b04aSChenbo Feng if (!(f.file->f_mode & FMODE_CAN_READ)) { 6886e71b04aSChenbo Feng err = -EPERM; 6896e71b04aSChenbo Feng goto err_put; 6906e71b04aSChenbo Feng } 6916e71b04aSChenbo Feng 692c9d29f46SMauricio Vasquez B key = __bpf_copy_key(ukey, map->key_size); 693e4448ed8SAl Viro if (IS_ERR(key)) { 694e4448ed8SAl Viro err = PTR_ERR(key); 695db20fd2bSAlexei Starovoitov goto err_put; 696e4448ed8SAl Viro } 697db20fd2bSAlexei Starovoitov 69815a07b33SAlexei Starovoitov if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || 6998f844938SMartin KaFai Lau map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || 700b741f163SRoman Gushchin map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY || 701b741f163SRoman Gushchin map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) 70215a07b33SAlexei Starovoitov value_size = round_up(map->value_size, 8) * num_possible_cpus(); 70314dc6f04SMartin KaFai Lau else if (IS_FD_MAP(map)) 70414dc6f04SMartin KaFai Lau value_size = sizeof(u32); 70515a07b33SAlexei Starovoitov else 70615a07b33SAlexei Starovoitov value_size = map->value_size; 70715a07b33SAlexei Starovoitov 7088ebe667cSAlexei Starovoitov err = -ENOMEM; 70915a07b33SAlexei Starovoitov value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); 710db20fd2bSAlexei Starovoitov if (!value) 7118ebe667cSAlexei Starovoitov goto free_key; 7128ebe667cSAlexei Starovoitov 713a3884572SJakub Kicinski if (bpf_map_is_dev_bound(map)) { 714a3884572SJakub Kicinski err = bpf_map_offload_lookup_elem(map, key, value); 715a3884572SJakub Kicinski } else if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || 7168f844938SMartin KaFai Lau map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { 71715a07b33SAlexei Starovoitov err = bpf_percpu_hash_copy(map, key, value); 71815a07b33SAlexei Starovoitov } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { 71915a07b33SAlexei Starovoitov err = bpf_percpu_array_copy(map, key, value); 720b741f163SRoman Gushchin } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) { 721b741f163SRoman Gushchin err = bpf_percpu_cgroup_storage_copy(map, key, value); 722557c0c6eSAlexei Starovoitov } else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) { 723557c0c6eSAlexei Starovoitov err = bpf_stackmap_copy(map, key, value); 72414dc6f04SMartin KaFai Lau } else if (IS_FD_ARRAY(map)) { 72514dc6f04SMartin KaFai Lau err = bpf_fd_array_map_lookup_elem(map, key, value); 72614dc6f04SMartin KaFai Lau } else if (IS_FD_HASH(map)) { 72714dc6f04SMartin KaFai Lau err = bpf_fd_htab_map_lookup_elem(map, key, value); 7285dc4c4b7SMartin KaFai Lau } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) { 7295dc4c4b7SMartin KaFai Lau err = bpf_fd_reuseport_array_lookup_elem(map, key, value); 730f1a2e44aSMauricio Vasquez B } else if (map->map_type == BPF_MAP_TYPE_QUEUE || 731f1a2e44aSMauricio Vasquez B map->map_type == BPF_MAP_TYPE_STACK) { 732f1a2e44aSMauricio Vasquez B err = map->ops->map_peek_elem(map, value); 73315a07b33SAlexei Starovoitov } else { 7348ebe667cSAlexei Starovoitov rcu_read_lock(); 7358ebe667cSAlexei Starovoitov ptr = map->ops->map_lookup_elem(map, key); 736509db283SPrashant Bhole if (IS_ERR(ptr)) { 737509db283SPrashant Bhole err = PTR_ERR(ptr); 738509db283SPrashant Bhole } else if (!ptr) { 739509db283SPrashant Bhole err = -ENOENT; 740509db283SPrashant Bhole } else { 741509db283SPrashant Bhole err = 0; 74215a07b33SAlexei Starovoitov memcpy(value, ptr, value_size); 743509db283SPrashant Bhole } 7448ebe667cSAlexei Starovoitov rcu_read_unlock(); 74515a07b33SAlexei Starovoitov } 7468ebe667cSAlexei Starovoitov 74715a07b33SAlexei Starovoitov if (err) 7488ebe667cSAlexei Starovoitov goto free_value; 749db20fd2bSAlexei Starovoitov 750db20fd2bSAlexei Starovoitov err = -EFAULT; 75115a07b33SAlexei Starovoitov if (copy_to_user(uvalue, value, value_size) != 0) 7528ebe667cSAlexei Starovoitov goto free_value; 753db20fd2bSAlexei Starovoitov 754db20fd2bSAlexei Starovoitov err = 0; 755db20fd2bSAlexei Starovoitov 7568ebe667cSAlexei Starovoitov free_value: 7578ebe667cSAlexei Starovoitov kfree(value); 758db20fd2bSAlexei Starovoitov free_key: 759db20fd2bSAlexei Starovoitov kfree(key); 760db20fd2bSAlexei Starovoitov err_put: 761db20fd2bSAlexei Starovoitov fdput(f); 762db20fd2bSAlexei Starovoitov return err; 763db20fd2bSAlexei Starovoitov } 764db20fd2bSAlexei Starovoitov 7651ae80cf3SDaniel Colascione static void maybe_wait_bpf_programs(struct bpf_map *map) 7661ae80cf3SDaniel Colascione { 7671ae80cf3SDaniel Colascione /* Wait for any running BPF programs to complete so that 7681ae80cf3SDaniel Colascione * userspace, when we return to it, knows that all programs 7691ae80cf3SDaniel Colascione * that could be running use the new map value. 7701ae80cf3SDaniel Colascione */ 7711ae80cf3SDaniel Colascione if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS || 7721ae80cf3SDaniel Colascione map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS) 7731ae80cf3SDaniel Colascione synchronize_rcu(); 7741ae80cf3SDaniel Colascione } 7751ae80cf3SDaniel Colascione 7763274f520SAlexei Starovoitov #define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags 777db20fd2bSAlexei Starovoitov 778db20fd2bSAlexei Starovoitov static int map_update_elem(union bpf_attr *attr) 779db20fd2bSAlexei Starovoitov { 780535e7b4bSMickaël Salaün void __user *ukey = u64_to_user_ptr(attr->key); 781535e7b4bSMickaël Salaün void __user *uvalue = u64_to_user_ptr(attr->value); 782db20fd2bSAlexei Starovoitov int ufd = attr->map_fd; 783db20fd2bSAlexei Starovoitov struct bpf_map *map; 784db20fd2bSAlexei Starovoitov void *key, *value; 78515a07b33SAlexei Starovoitov u32 value_size; 786592867bfSDaniel Borkmann struct fd f; 787db20fd2bSAlexei Starovoitov int err; 788db20fd2bSAlexei Starovoitov 789db20fd2bSAlexei Starovoitov if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM)) 790db20fd2bSAlexei Starovoitov return -EINVAL; 791db20fd2bSAlexei Starovoitov 792592867bfSDaniel Borkmann f = fdget(ufd); 793c2101297SDaniel Borkmann map = __bpf_map_get(f); 794db20fd2bSAlexei Starovoitov if (IS_ERR(map)) 795db20fd2bSAlexei Starovoitov return PTR_ERR(map); 796db20fd2bSAlexei Starovoitov 7976e71b04aSChenbo Feng if (!(f.file->f_mode & FMODE_CAN_WRITE)) { 7986e71b04aSChenbo Feng err = -EPERM; 7996e71b04aSChenbo Feng goto err_put; 8006e71b04aSChenbo Feng } 8016e71b04aSChenbo Feng 802c9d29f46SMauricio Vasquez B key = __bpf_copy_key(ukey, map->key_size); 803e4448ed8SAl Viro if (IS_ERR(key)) { 804e4448ed8SAl Viro err = PTR_ERR(key); 805db20fd2bSAlexei Starovoitov goto err_put; 806e4448ed8SAl Viro } 807db20fd2bSAlexei Starovoitov 80815a07b33SAlexei Starovoitov if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || 8098f844938SMartin KaFai Lau map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH || 810b741f163SRoman Gushchin map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY || 811b741f163SRoman Gushchin map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) 81215a07b33SAlexei Starovoitov value_size = round_up(map->value_size, 8) * num_possible_cpus(); 81315a07b33SAlexei Starovoitov else 81415a07b33SAlexei Starovoitov value_size = map->value_size; 81515a07b33SAlexei Starovoitov 816db20fd2bSAlexei Starovoitov err = -ENOMEM; 81715a07b33SAlexei Starovoitov value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); 818db20fd2bSAlexei Starovoitov if (!value) 819db20fd2bSAlexei Starovoitov goto free_key; 820db20fd2bSAlexei Starovoitov 821db20fd2bSAlexei Starovoitov err = -EFAULT; 82215a07b33SAlexei Starovoitov if (copy_from_user(value, uvalue, value_size) != 0) 823db20fd2bSAlexei Starovoitov goto free_value; 824db20fd2bSAlexei Starovoitov 8256710e112SJesper Dangaard Brouer /* Need to create a kthread, thus must support schedule */ 826a3884572SJakub Kicinski if (bpf_map_is_dev_bound(map)) { 827a3884572SJakub Kicinski err = bpf_map_offload_update_elem(map, key, value, attr->flags); 828a3884572SJakub Kicinski goto out; 82999ba2b5aSJohn Fastabend } else if (map->map_type == BPF_MAP_TYPE_CPUMAP || 83099ba2b5aSJohn Fastabend map->map_type == BPF_MAP_TYPE_SOCKHASH || 83199ba2b5aSJohn Fastabend map->map_type == BPF_MAP_TYPE_SOCKMAP) { 8326710e112SJesper Dangaard Brouer err = map->ops->map_update_elem(map, key, value, attr->flags); 8336710e112SJesper Dangaard Brouer goto out; 8346710e112SJesper Dangaard Brouer } 8356710e112SJesper Dangaard Brouer 836b121d1e7SAlexei Starovoitov /* must increment bpf_prog_active to avoid kprobe+bpf triggering from 837b121d1e7SAlexei Starovoitov * inside bpf map update or delete otherwise deadlocks are possible 838b121d1e7SAlexei Starovoitov */ 839b121d1e7SAlexei Starovoitov preempt_disable(); 840b121d1e7SAlexei Starovoitov __this_cpu_inc(bpf_prog_active); 8418f844938SMartin KaFai Lau if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH || 8428f844938SMartin KaFai Lau map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) { 84315a07b33SAlexei Starovoitov err = bpf_percpu_hash_update(map, key, value, attr->flags); 84415a07b33SAlexei Starovoitov } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) { 84515a07b33SAlexei Starovoitov err = bpf_percpu_array_update(map, key, value, attr->flags); 846b741f163SRoman Gushchin } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) { 847b741f163SRoman Gushchin err = bpf_percpu_cgroup_storage_update(map, key, value, 848b741f163SRoman Gushchin attr->flags); 8499c147b56SMickaël Salaün } else if (IS_FD_ARRAY(map)) { 850d056a788SDaniel Borkmann rcu_read_lock(); 851d056a788SDaniel Borkmann err = bpf_fd_array_map_update_elem(map, f.file, key, value, 852d056a788SDaniel Borkmann attr->flags); 853d056a788SDaniel Borkmann rcu_read_unlock(); 854bcc6b1b7SMartin KaFai Lau } else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) { 855bcc6b1b7SMartin KaFai Lau rcu_read_lock(); 856bcc6b1b7SMartin KaFai Lau err = bpf_fd_htab_map_update_elem(map, f.file, key, value, 857bcc6b1b7SMartin KaFai Lau attr->flags); 858bcc6b1b7SMartin KaFai Lau rcu_read_unlock(); 8595dc4c4b7SMartin KaFai Lau } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) { 8605dc4c4b7SMartin KaFai Lau /* rcu_read_lock() is not needed */ 8615dc4c4b7SMartin KaFai Lau err = bpf_fd_reuseport_array_update_elem(map, key, value, 8625dc4c4b7SMartin KaFai Lau attr->flags); 863f1a2e44aSMauricio Vasquez B } else if (map->map_type == BPF_MAP_TYPE_QUEUE || 864f1a2e44aSMauricio Vasquez B map->map_type == BPF_MAP_TYPE_STACK) { 865f1a2e44aSMauricio Vasquez B err = map->ops->map_push_elem(map, value, attr->flags); 86615a07b33SAlexei Starovoitov } else { 867db20fd2bSAlexei Starovoitov rcu_read_lock(); 8683274f520SAlexei Starovoitov err = map->ops->map_update_elem(map, key, value, attr->flags); 869db20fd2bSAlexei Starovoitov rcu_read_unlock(); 87015a07b33SAlexei Starovoitov } 871b121d1e7SAlexei Starovoitov __this_cpu_dec(bpf_prog_active); 872b121d1e7SAlexei Starovoitov preempt_enable(); 8731ae80cf3SDaniel Colascione maybe_wait_bpf_programs(map); 8746710e112SJesper Dangaard Brouer out: 875db20fd2bSAlexei Starovoitov free_value: 876db20fd2bSAlexei Starovoitov kfree(value); 877db20fd2bSAlexei Starovoitov free_key: 878db20fd2bSAlexei Starovoitov kfree(key); 879db20fd2bSAlexei Starovoitov err_put: 880db20fd2bSAlexei Starovoitov fdput(f); 881db20fd2bSAlexei Starovoitov return err; 882db20fd2bSAlexei Starovoitov } 883db20fd2bSAlexei Starovoitov 884db20fd2bSAlexei Starovoitov #define BPF_MAP_DELETE_ELEM_LAST_FIELD key 885db20fd2bSAlexei Starovoitov 886db20fd2bSAlexei Starovoitov static int map_delete_elem(union bpf_attr *attr) 887db20fd2bSAlexei Starovoitov { 888535e7b4bSMickaël Salaün void __user *ukey = u64_to_user_ptr(attr->key); 889db20fd2bSAlexei Starovoitov int ufd = attr->map_fd; 890db20fd2bSAlexei Starovoitov struct bpf_map *map; 891592867bfSDaniel Borkmann struct fd f; 892db20fd2bSAlexei Starovoitov void *key; 893db20fd2bSAlexei Starovoitov int err; 894db20fd2bSAlexei Starovoitov 895db20fd2bSAlexei Starovoitov if (CHECK_ATTR(BPF_MAP_DELETE_ELEM)) 896db20fd2bSAlexei Starovoitov return -EINVAL; 897db20fd2bSAlexei Starovoitov 898592867bfSDaniel Borkmann f = fdget(ufd); 899c2101297SDaniel Borkmann map = __bpf_map_get(f); 900db20fd2bSAlexei Starovoitov if (IS_ERR(map)) 901db20fd2bSAlexei Starovoitov return PTR_ERR(map); 902db20fd2bSAlexei Starovoitov 9036e71b04aSChenbo Feng if (!(f.file->f_mode & FMODE_CAN_WRITE)) { 9046e71b04aSChenbo Feng err = -EPERM; 9056e71b04aSChenbo Feng goto err_put; 9066e71b04aSChenbo Feng } 9076e71b04aSChenbo Feng 908c9d29f46SMauricio Vasquez B key = __bpf_copy_key(ukey, map->key_size); 909e4448ed8SAl Viro if (IS_ERR(key)) { 910e4448ed8SAl Viro err = PTR_ERR(key); 911db20fd2bSAlexei Starovoitov goto err_put; 912e4448ed8SAl Viro } 913db20fd2bSAlexei Starovoitov 914a3884572SJakub Kicinski if (bpf_map_is_dev_bound(map)) { 915a3884572SJakub Kicinski err = bpf_map_offload_delete_elem(map, key); 916a3884572SJakub Kicinski goto out; 917a3884572SJakub Kicinski } 918a3884572SJakub Kicinski 919b121d1e7SAlexei Starovoitov preempt_disable(); 920b121d1e7SAlexei Starovoitov __this_cpu_inc(bpf_prog_active); 921db20fd2bSAlexei Starovoitov rcu_read_lock(); 922db20fd2bSAlexei Starovoitov err = map->ops->map_delete_elem(map, key); 923db20fd2bSAlexei Starovoitov rcu_read_unlock(); 924b121d1e7SAlexei Starovoitov __this_cpu_dec(bpf_prog_active); 925b121d1e7SAlexei Starovoitov preempt_enable(); 9261ae80cf3SDaniel Colascione maybe_wait_bpf_programs(map); 927a3884572SJakub Kicinski out: 928db20fd2bSAlexei Starovoitov kfree(key); 929db20fd2bSAlexei Starovoitov err_put: 930db20fd2bSAlexei Starovoitov fdput(f); 931db20fd2bSAlexei Starovoitov return err; 932db20fd2bSAlexei Starovoitov } 933db20fd2bSAlexei Starovoitov 934db20fd2bSAlexei Starovoitov /* last field in 'union bpf_attr' used by this command */ 935db20fd2bSAlexei Starovoitov #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key 936db20fd2bSAlexei Starovoitov 937db20fd2bSAlexei Starovoitov static int map_get_next_key(union bpf_attr *attr) 938db20fd2bSAlexei Starovoitov { 939535e7b4bSMickaël Salaün void __user *ukey = u64_to_user_ptr(attr->key); 940535e7b4bSMickaël Salaün void __user *unext_key = u64_to_user_ptr(attr->next_key); 941db20fd2bSAlexei Starovoitov int ufd = attr->map_fd; 942db20fd2bSAlexei Starovoitov struct bpf_map *map; 943db20fd2bSAlexei Starovoitov void *key, *next_key; 944592867bfSDaniel Borkmann struct fd f; 945db20fd2bSAlexei Starovoitov int err; 946db20fd2bSAlexei Starovoitov 947db20fd2bSAlexei Starovoitov if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY)) 948db20fd2bSAlexei Starovoitov return -EINVAL; 949db20fd2bSAlexei Starovoitov 950592867bfSDaniel Borkmann f = fdget(ufd); 951c2101297SDaniel Borkmann map = __bpf_map_get(f); 952db20fd2bSAlexei Starovoitov if (IS_ERR(map)) 953db20fd2bSAlexei Starovoitov return PTR_ERR(map); 954db20fd2bSAlexei Starovoitov 9556e71b04aSChenbo Feng if (!(f.file->f_mode & FMODE_CAN_READ)) { 9566e71b04aSChenbo Feng err = -EPERM; 9576e71b04aSChenbo Feng goto err_put; 9586e71b04aSChenbo Feng } 9596e71b04aSChenbo Feng 9608fe45924STeng Qin if (ukey) { 961c9d29f46SMauricio Vasquez B key = __bpf_copy_key(ukey, map->key_size); 962e4448ed8SAl Viro if (IS_ERR(key)) { 963e4448ed8SAl Viro err = PTR_ERR(key); 964db20fd2bSAlexei Starovoitov goto err_put; 965e4448ed8SAl Viro } 9668fe45924STeng Qin } else { 9678fe45924STeng Qin key = NULL; 9688fe45924STeng Qin } 969db20fd2bSAlexei Starovoitov 970db20fd2bSAlexei Starovoitov err = -ENOMEM; 971db20fd2bSAlexei Starovoitov next_key = kmalloc(map->key_size, GFP_USER); 972db20fd2bSAlexei Starovoitov if (!next_key) 973db20fd2bSAlexei Starovoitov goto free_key; 974db20fd2bSAlexei Starovoitov 975a3884572SJakub Kicinski if (bpf_map_is_dev_bound(map)) { 976a3884572SJakub Kicinski err = bpf_map_offload_get_next_key(map, key, next_key); 977a3884572SJakub Kicinski goto out; 978a3884572SJakub Kicinski } 979a3884572SJakub Kicinski 980db20fd2bSAlexei Starovoitov rcu_read_lock(); 981db20fd2bSAlexei Starovoitov err = map->ops->map_get_next_key(map, key, next_key); 982db20fd2bSAlexei Starovoitov rcu_read_unlock(); 983a3884572SJakub Kicinski out: 984db20fd2bSAlexei Starovoitov if (err) 985db20fd2bSAlexei Starovoitov goto free_next_key; 986db20fd2bSAlexei Starovoitov 987db20fd2bSAlexei Starovoitov err = -EFAULT; 988db20fd2bSAlexei Starovoitov if (copy_to_user(unext_key, next_key, map->key_size) != 0) 989db20fd2bSAlexei Starovoitov goto free_next_key; 990db20fd2bSAlexei Starovoitov 991db20fd2bSAlexei Starovoitov err = 0; 992db20fd2bSAlexei Starovoitov 993db20fd2bSAlexei Starovoitov free_next_key: 994db20fd2bSAlexei Starovoitov kfree(next_key); 995db20fd2bSAlexei Starovoitov free_key: 996db20fd2bSAlexei Starovoitov kfree(key); 997db20fd2bSAlexei Starovoitov err_put: 998db20fd2bSAlexei Starovoitov fdput(f); 999db20fd2bSAlexei Starovoitov return err; 1000db20fd2bSAlexei Starovoitov } 1001db20fd2bSAlexei Starovoitov 1002bd513cd0SMauricio Vasquez B #define BPF_MAP_LOOKUP_AND_DELETE_ELEM_LAST_FIELD value 1003bd513cd0SMauricio Vasquez B 1004bd513cd0SMauricio Vasquez B static int map_lookup_and_delete_elem(union bpf_attr *attr) 1005bd513cd0SMauricio Vasquez B { 1006bd513cd0SMauricio Vasquez B void __user *ukey = u64_to_user_ptr(attr->key); 1007bd513cd0SMauricio Vasquez B void __user *uvalue = u64_to_user_ptr(attr->value); 1008bd513cd0SMauricio Vasquez B int ufd = attr->map_fd; 1009bd513cd0SMauricio Vasquez B struct bpf_map *map; 1010*540fefc0SAlexei Starovoitov void *key, *value; 1011bd513cd0SMauricio Vasquez B u32 value_size; 1012bd513cd0SMauricio Vasquez B struct fd f; 1013bd513cd0SMauricio Vasquez B int err; 1014bd513cd0SMauricio Vasquez B 1015bd513cd0SMauricio Vasquez B if (CHECK_ATTR(BPF_MAP_LOOKUP_AND_DELETE_ELEM)) 1016bd513cd0SMauricio Vasquez B return -EINVAL; 1017bd513cd0SMauricio Vasquez B 1018bd513cd0SMauricio Vasquez B f = fdget(ufd); 1019bd513cd0SMauricio Vasquez B map = __bpf_map_get(f); 1020bd513cd0SMauricio Vasquez B if (IS_ERR(map)) 1021bd513cd0SMauricio Vasquez B return PTR_ERR(map); 1022bd513cd0SMauricio Vasquez B 1023bd513cd0SMauricio Vasquez B if (!(f.file->f_mode & FMODE_CAN_WRITE)) { 1024bd513cd0SMauricio Vasquez B err = -EPERM; 1025bd513cd0SMauricio Vasquez B goto err_put; 1026bd513cd0SMauricio Vasquez B } 1027bd513cd0SMauricio Vasquez B 1028bd513cd0SMauricio Vasquez B key = __bpf_copy_key(ukey, map->key_size); 1029bd513cd0SMauricio Vasquez B if (IS_ERR(key)) { 1030bd513cd0SMauricio Vasquez B err = PTR_ERR(key); 1031bd513cd0SMauricio Vasquez B goto err_put; 1032bd513cd0SMauricio Vasquez B } 1033bd513cd0SMauricio Vasquez B 1034bd513cd0SMauricio Vasquez B value_size = map->value_size; 1035bd513cd0SMauricio Vasquez B 1036bd513cd0SMauricio Vasquez B err = -ENOMEM; 1037bd513cd0SMauricio Vasquez B value = kmalloc(value_size, GFP_USER | __GFP_NOWARN); 1038bd513cd0SMauricio Vasquez B if (!value) 1039bd513cd0SMauricio Vasquez B goto free_key; 1040bd513cd0SMauricio Vasquez B 1041bd513cd0SMauricio Vasquez B if (map->map_type == BPF_MAP_TYPE_QUEUE || 1042bd513cd0SMauricio Vasquez B map->map_type == BPF_MAP_TYPE_STACK) { 1043bd513cd0SMauricio Vasquez B err = map->ops->map_pop_elem(map, value); 1044bd513cd0SMauricio Vasquez B } else { 1045bd513cd0SMauricio Vasquez B err = -ENOTSUPP; 1046bd513cd0SMauricio Vasquez B } 1047bd513cd0SMauricio Vasquez B 1048bd513cd0SMauricio Vasquez B if (err) 1049bd513cd0SMauricio Vasquez B goto free_value; 1050bd513cd0SMauricio Vasquez B 1051bd513cd0SMauricio Vasquez B if (copy_to_user(uvalue, value, value_size) != 0) 1052bd513cd0SMauricio Vasquez B goto free_value; 1053bd513cd0SMauricio Vasquez B 1054bd513cd0SMauricio Vasquez B err = 0; 1055bd513cd0SMauricio Vasquez B 1056bd513cd0SMauricio Vasquez B free_value: 1057bd513cd0SMauricio Vasquez B kfree(value); 1058bd513cd0SMauricio Vasquez B free_key: 1059bd513cd0SMauricio Vasquez B kfree(key); 1060bd513cd0SMauricio Vasquez B err_put: 1061bd513cd0SMauricio Vasquez B fdput(f); 1062bd513cd0SMauricio Vasquez B return err; 1063bd513cd0SMauricio Vasquez B } 1064bd513cd0SMauricio Vasquez B 10657de16e3aSJakub Kicinski static const struct bpf_prog_ops * const bpf_prog_types[] = { 10667de16e3aSJakub Kicinski #define BPF_PROG_TYPE(_id, _name) \ 10677de16e3aSJakub Kicinski [_id] = & _name ## _prog_ops, 10687de16e3aSJakub Kicinski #define BPF_MAP_TYPE(_id, _ops) 10697de16e3aSJakub Kicinski #include <linux/bpf_types.h> 10707de16e3aSJakub Kicinski #undef BPF_PROG_TYPE 10717de16e3aSJakub Kicinski #undef BPF_MAP_TYPE 10727de16e3aSJakub Kicinski }; 10737de16e3aSJakub Kicinski 107409756af4SAlexei Starovoitov static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog) 107509756af4SAlexei Starovoitov { 1076d0f1a451SDaniel Borkmann const struct bpf_prog_ops *ops; 1077d0f1a451SDaniel Borkmann 1078d0f1a451SDaniel Borkmann if (type >= ARRAY_SIZE(bpf_prog_types)) 1079d0f1a451SDaniel Borkmann return -EINVAL; 1080d0f1a451SDaniel Borkmann type = array_index_nospec(type, ARRAY_SIZE(bpf_prog_types)); 1081d0f1a451SDaniel Borkmann ops = bpf_prog_types[type]; 1082d0f1a451SDaniel Borkmann if (!ops) 1083be9370a7SJohannes Berg return -EINVAL; 108409756af4SAlexei Starovoitov 1085ab3f0063SJakub Kicinski if (!bpf_prog_is_dev_bound(prog->aux)) 1086d0f1a451SDaniel Borkmann prog->aux->ops = ops; 1087ab3f0063SJakub Kicinski else 1088ab3f0063SJakub Kicinski prog->aux->ops = &bpf_offload_prog_ops; 108924701eceSDaniel Borkmann prog->type = type; 109009756af4SAlexei Starovoitov return 0; 109109756af4SAlexei Starovoitov } 109209756af4SAlexei Starovoitov 109309756af4SAlexei Starovoitov /* drop refcnt on maps used by eBPF program and free auxilary data */ 109409756af4SAlexei Starovoitov static void free_used_maps(struct bpf_prog_aux *aux) 109509756af4SAlexei Starovoitov { 10968bad74f9SRoman Gushchin enum bpf_cgroup_storage_type stype; 109709756af4SAlexei Starovoitov int i; 109809756af4SAlexei Starovoitov 10998bad74f9SRoman Gushchin for_each_cgroup_storage_type(stype) { 11008bad74f9SRoman Gushchin if (!aux->cgroup_storage[stype]) 11018bad74f9SRoman Gushchin continue; 11028bad74f9SRoman Gushchin bpf_cgroup_storage_release(aux->prog, 11038bad74f9SRoman Gushchin aux->cgroup_storage[stype]); 11048bad74f9SRoman Gushchin } 1105de9cbbaaSRoman Gushchin 110609756af4SAlexei Starovoitov for (i = 0; i < aux->used_map_cnt; i++) 110709756af4SAlexei Starovoitov bpf_map_put(aux->used_maps[i]); 110809756af4SAlexei Starovoitov 110909756af4SAlexei Starovoitov kfree(aux->used_maps); 111009756af4SAlexei Starovoitov } 111109756af4SAlexei Starovoitov 11125ccb071eSDaniel Borkmann int __bpf_prog_charge(struct user_struct *user, u32 pages) 11135ccb071eSDaniel Borkmann { 11145ccb071eSDaniel Borkmann unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; 11155ccb071eSDaniel Borkmann unsigned long user_bufs; 11165ccb071eSDaniel Borkmann 11175ccb071eSDaniel Borkmann if (user) { 11185ccb071eSDaniel Borkmann user_bufs = atomic_long_add_return(pages, &user->locked_vm); 11195ccb071eSDaniel Borkmann if (user_bufs > memlock_limit) { 11205ccb071eSDaniel Borkmann atomic_long_sub(pages, &user->locked_vm); 11215ccb071eSDaniel Borkmann return -EPERM; 11225ccb071eSDaniel Borkmann } 11235ccb071eSDaniel Borkmann } 11245ccb071eSDaniel Borkmann 11255ccb071eSDaniel Borkmann return 0; 11265ccb071eSDaniel Borkmann } 11275ccb071eSDaniel Borkmann 11285ccb071eSDaniel Borkmann void __bpf_prog_uncharge(struct user_struct *user, u32 pages) 11295ccb071eSDaniel Borkmann { 11305ccb071eSDaniel Borkmann if (user) 11315ccb071eSDaniel Borkmann atomic_long_sub(pages, &user->locked_vm); 11325ccb071eSDaniel Borkmann } 11335ccb071eSDaniel Borkmann 1134aaac3ba9SAlexei Starovoitov static int bpf_prog_charge_memlock(struct bpf_prog *prog) 1135aaac3ba9SAlexei Starovoitov { 1136aaac3ba9SAlexei Starovoitov struct user_struct *user = get_current_user(); 11375ccb071eSDaniel Borkmann int ret; 1138aaac3ba9SAlexei Starovoitov 11395ccb071eSDaniel Borkmann ret = __bpf_prog_charge(user, prog->pages); 11405ccb071eSDaniel Borkmann if (ret) { 1141aaac3ba9SAlexei Starovoitov free_uid(user); 11425ccb071eSDaniel Borkmann return ret; 1143aaac3ba9SAlexei Starovoitov } 11445ccb071eSDaniel Borkmann 1145aaac3ba9SAlexei Starovoitov prog->aux->user = user; 1146aaac3ba9SAlexei Starovoitov return 0; 1147aaac3ba9SAlexei Starovoitov } 1148aaac3ba9SAlexei Starovoitov 1149aaac3ba9SAlexei Starovoitov static void bpf_prog_uncharge_memlock(struct bpf_prog *prog) 1150aaac3ba9SAlexei Starovoitov { 1151aaac3ba9SAlexei Starovoitov struct user_struct *user = prog->aux->user; 1152aaac3ba9SAlexei Starovoitov 11535ccb071eSDaniel Borkmann __bpf_prog_uncharge(user, prog->pages); 1154aaac3ba9SAlexei Starovoitov free_uid(user); 1155aaac3ba9SAlexei Starovoitov } 1156aaac3ba9SAlexei Starovoitov 1157dc4bb0e2SMartin KaFai Lau static int bpf_prog_alloc_id(struct bpf_prog *prog) 1158dc4bb0e2SMartin KaFai Lau { 1159dc4bb0e2SMartin KaFai Lau int id; 1160dc4bb0e2SMartin KaFai Lau 1161b76354cdSShaohua Li idr_preload(GFP_KERNEL); 1162dc4bb0e2SMartin KaFai Lau spin_lock_bh(&prog_idr_lock); 1163dc4bb0e2SMartin KaFai Lau id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC); 1164dc4bb0e2SMartin KaFai Lau if (id > 0) 1165dc4bb0e2SMartin KaFai Lau prog->aux->id = id; 1166dc4bb0e2SMartin KaFai Lau spin_unlock_bh(&prog_idr_lock); 1167b76354cdSShaohua Li idr_preload_end(); 1168dc4bb0e2SMartin KaFai Lau 1169dc4bb0e2SMartin KaFai Lau /* id is in [1, INT_MAX) */ 1170dc4bb0e2SMartin KaFai Lau if (WARN_ON_ONCE(!id)) 1171dc4bb0e2SMartin KaFai Lau return -ENOSPC; 1172dc4bb0e2SMartin KaFai Lau 1173dc4bb0e2SMartin KaFai Lau return id > 0 ? 0 : id; 1174dc4bb0e2SMartin KaFai Lau } 1175dc4bb0e2SMartin KaFai Lau 1176ad8ad79fSJakub Kicinski void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock) 1177dc4bb0e2SMartin KaFai Lau { 1178ad8ad79fSJakub Kicinski /* cBPF to eBPF migrations are currently not in the idr store. 1179ad8ad79fSJakub Kicinski * Offloaded programs are removed from the store when their device 1180ad8ad79fSJakub Kicinski * disappears - even if someone grabs an fd to them they are unusable, 1181ad8ad79fSJakub Kicinski * simply waiting for refcnt to drop to be freed. 1182ad8ad79fSJakub Kicinski */ 1183dc4bb0e2SMartin KaFai Lau if (!prog->aux->id) 1184dc4bb0e2SMartin KaFai Lau return; 1185dc4bb0e2SMartin KaFai Lau 1186b16d9aa4SMartin KaFai Lau if (do_idr_lock) 1187dc4bb0e2SMartin KaFai Lau spin_lock_bh(&prog_idr_lock); 1188b16d9aa4SMartin KaFai Lau else 1189b16d9aa4SMartin KaFai Lau __acquire(&prog_idr_lock); 1190b16d9aa4SMartin KaFai Lau 1191dc4bb0e2SMartin KaFai Lau idr_remove(&prog_idr, prog->aux->id); 1192ad8ad79fSJakub Kicinski prog->aux->id = 0; 1193b16d9aa4SMartin KaFai Lau 1194b16d9aa4SMartin KaFai Lau if (do_idr_lock) 1195dc4bb0e2SMartin KaFai Lau spin_unlock_bh(&prog_idr_lock); 1196b16d9aa4SMartin KaFai Lau else 1197b16d9aa4SMartin KaFai Lau __release(&prog_idr_lock); 1198dc4bb0e2SMartin KaFai Lau } 1199dc4bb0e2SMartin KaFai Lau 12001aacde3dSDaniel Borkmann static void __bpf_prog_put_rcu(struct rcu_head *rcu) 1201abf2e7d6SAlexei Starovoitov { 1202abf2e7d6SAlexei Starovoitov struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu); 1203abf2e7d6SAlexei Starovoitov 1204abf2e7d6SAlexei Starovoitov free_used_maps(aux); 1205aaac3ba9SAlexei Starovoitov bpf_prog_uncharge_memlock(aux->prog); 1206afdb09c7SChenbo Feng security_bpf_prog_free(aux); 1207abf2e7d6SAlexei Starovoitov bpf_prog_free(aux->prog); 1208abf2e7d6SAlexei Starovoitov } 1209abf2e7d6SAlexei Starovoitov 1210b16d9aa4SMartin KaFai Lau static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock) 121109756af4SAlexei Starovoitov { 1212a67edbf4SDaniel Borkmann if (atomic_dec_and_test(&prog->aux->refcnt)) { 121334ad5580SMartin KaFai Lau /* bpf_prog_free_id() must be called first */ 1214b16d9aa4SMartin KaFai Lau bpf_prog_free_id(prog, do_idr_lock); 12157d1982b4SDaniel Borkmann bpf_prog_kallsyms_del_all(prog); 12164f74d809SDaniel Borkmann 12171aacde3dSDaniel Borkmann call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu); 121809756af4SAlexei Starovoitov } 1219a67edbf4SDaniel Borkmann } 1220b16d9aa4SMartin KaFai Lau 1221b16d9aa4SMartin KaFai Lau void bpf_prog_put(struct bpf_prog *prog) 1222b16d9aa4SMartin KaFai Lau { 1223b16d9aa4SMartin KaFai Lau __bpf_prog_put(prog, true); 1224b16d9aa4SMartin KaFai Lau } 1225e2e9b654SDaniel Borkmann EXPORT_SYMBOL_GPL(bpf_prog_put); 122609756af4SAlexei Starovoitov 122709756af4SAlexei Starovoitov static int bpf_prog_release(struct inode *inode, struct file *filp) 122809756af4SAlexei Starovoitov { 122909756af4SAlexei Starovoitov struct bpf_prog *prog = filp->private_data; 123009756af4SAlexei Starovoitov 12311aacde3dSDaniel Borkmann bpf_prog_put(prog); 123209756af4SAlexei Starovoitov return 0; 123309756af4SAlexei Starovoitov } 123409756af4SAlexei Starovoitov 12357bd509e3SDaniel Borkmann #ifdef CONFIG_PROC_FS 12367bd509e3SDaniel Borkmann static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp) 12377bd509e3SDaniel Borkmann { 12387bd509e3SDaniel Borkmann const struct bpf_prog *prog = filp->private_data; 1239f1f7714eSDaniel Borkmann char prog_tag[sizeof(prog->tag) * 2 + 1] = { }; 12407bd509e3SDaniel Borkmann 1241f1f7714eSDaniel Borkmann bin2hex(prog_tag, prog->tag, sizeof(prog->tag)); 12427bd509e3SDaniel Borkmann seq_printf(m, 12437bd509e3SDaniel Borkmann "prog_type:\t%u\n" 12447bd509e3SDaniel Borkmann "prog_jited:\t%u\n" 1245f1f7714eSDaniel Borkmann "prog_tag:\t%s\n" 12464316b409SDaniel Borkmann "memlock:\t%llu\n" 12474316b409SDaniel Borkmann "prog_id:\t%u\n", 12487bd509e3SDaniel Borkmann prog->type, 12497bd509e3SDaniel Borkmann prog->jited, 1250f1f7714eSDaniel Borkmann prog_tag, 12514316b409SDaniel Borkmann prog->pages * 1ULL << PAGE_SHIFT, 12524316b409SDaniel Borkmann prog->aux->id); 12537bd509e3SDaniel Borkmann } 12547bd509e3SDaniel Borkmann #endif 12557bd509e3SDaniel Borkmann 1256f66e448cSChenbo Feng const struct file_operations bpf_prog_fops = { 12577bd509e3SDaniel Borkmann #ifdef CONFIG_PROC_FS 12587bd509e3SDaniel Borkmann .show_fdinfo = bpf_prog_show_fdinfo, 12597bd509e3SDaniel Borkmann #endif 126009756af4SAlexei Starovoitov .release = bpf_prog_release, 12616e71b04aSChenbo Feng .read = bpf_dummy_read, 12626e71b04aSChenbo Feng .write = bpf_dummy_write, 126309756af4SAlexei Starovoitov }; 126409756af4SAlexei Starovoitov 1265b2197755SDaniel Borkmann int bpf_prog_new_fd(struct bpf_prog *prog) 1266aa79781bSDaniel Borkmann { 1267afdb09c7SChenbo Feng int ret; 1268afdb09c7SChenbo Feng 1269afdb09c7SChenbo Feng ret = security_bpf_prog(prog); 1270afdb09c7SChenbo Feng if (ret < 0) 1271afdb09c7SChenbo Feng return ret; 1272afdb09c7SChenbo Feng 1273aa79781bSDaniel Borkmann return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog, 1274aa79781bSDaniel Borkmann O_RDWR | O_CLOEXEC); 1275aa79781bSDaniel Borkmann } 1276aa79781bSDaniel Borkmann 1277113214beSDaniel Borkmann static struct bpf_prog *____bpf_prog_get(struct fd f) 127809756af4SAlexei Starovoitov { 127909756af4SAlexei Starovoitov if (!f.file) 128009756af4SAlexei Starovoitov return ERR_PTR(-EBADF); 128109756af4SAlexei Starovoitov if (f.file->f_op != &bpf_prog_fops) { 128209756af4SAlexei Starovoitov fdput(f); 128309756af4SAlexei Starovoitov return ERR_PTR(-EINVAL); 128409756af4SAlexei Starovoitov } 128509756af4SAlexei Starovoitov 1286c2101297SDaniel Borkmann return f.file->private_data; 128709756af4SAlexei Starovoitov } 128809756af4SAlexei Starovoitov 128959d3656dSBrenden Blanco struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i) 129092117d84SAlexei Starovoitov { 129159d3656dSBrenden Blanco if (atomic_add_return(i, &prog->aux->refcnt) > BPF_MAX_REFCNT) { 129259d3656dSBrenden Blanco atomic_sub(i, &prog->aux->refcnt); 129392117d84SAlexei Starovoitov return ERR_PTR(-EBUSY); 129492117d84SAlexei Starovoitov } 129592117d84SAlexei Starovoitov return prog; 129692117d84SAlexei Starovoitov } 129759d3656dSBrenden Blanco EXPORT_SYMBOL_GPL(bpf_prog_add); 129859d3656dSBrenden Blanco 1299c540594fSDaniel Borkmann void bpf_prog_sub(struct bpf_prog *prog, int i) 1300c540594fSDaniel Borkmann { 1301c540594fSDaniel Borkmann /* Only to be used for undoing previous bpf_prog_add() in some 1302c540594fSDaniel Borkmann * error path. We still know that another entity in our call 1303c540594fSDaniel Borkmann * path holds a reference to the program, thus atomic_sub() can 1304c540594fSDaniel Borkmann * be safely used in such cases! 1305c540594fSDaniel Borkmann */ 1306c540594fSDaniel Borkmann WARN_ON(atomic_sub_return(i, &prog->aux->refcnt) == 0); 1307c540594fSDaniel Borkmann } 1308c540594fSDaniel Borkmann EXPORT_SYMBOL_GPL(bpf_prog_sub); 1309c540594fSDaniel Borkmann 131059d3656dSBrenden Blanco struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog) 131159d3656dSBrenden Blanco { 131259d3656dSBrenden Blanco return bpf_prog_add(prog, 1); 131359d3656dSBrenden Blanco } 131497bc402dSDaniel Borkmann EXPORT_SYMBOL_GPL(bpf_prog_inc); 131592117d84SAlexei Starovoitov 1316b16d9aa4SMartin KaFai Lau /* prog_idr_lock should have been held */ 1317a6f6df69SJohn Fastabend struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog) 1318b16d9aa4SMartin KaFai Lau { 1319b16d9aa4SMartin KaFai Lau int refold; 1320b16d9aa4SMartin KaFai Lau 1321bfc18e38SMark Rutland refold = atomic_fetch_add_unless(&prog->aux->refcnt, 1, 0); 1322b16d9aa4SMartin KaFai Lau 1323b16d9aa4SMartin KaFai Lau if (refold >= BPF_MAX_REFCNT) { 1324b16d9aa4SMartin KaFai Lau __bpf_prog_put(prog, false); 1325b16d9aa4SMartin KaFai Lau return ERR_PTR(-EBUSY); 1326b16d9aa4SMartin KaFai Lau } 1327b16d9aa4SMartin KaFai Lau 1328b16d9aa4SMartin KaFai Lau if (!refold) 1329b16d9aa4SMartin KaFai Lau return ERR_PTR(-ENOENT); 1330b16d9aa4SMartin KaFai Lau 1331b16d9aa4SMartin KaFai Lau return prog; 1332b16d9aa4SMartin KaFai Lau } 1333a6f6df69SJohn Fastabend EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero); 1334b16d9aa4SMartin KaFai Lau 1335040ee692SAl Viro bool bpf_prog_get_ok(struct bpf_prog *prog, 1336288b3de5SJakub Kicinski enum bpf_prog_type *attach_type, bool attach_drv) 1337248f346fSJakub Kicinski { 1338288b3de5SJakub Kicinski /* not an attachment, just a refcount inc, always allow */ 1339288b3de5SJakub Kicinski if (!attach_type) 1340288b3de5SJakub Kicinski return true; 1341248f346fSJakub Kicinski 1342248f346fSJakub Kicinski if (prog->type != *attach_type) 1343248f346fSJakub Kicinski return false; 1344288b3de5SJakub Kicinski if (bpf_prog_is_dev_bound(prog->aux) && !attach_drv) 1345248f346fSJakub Kicinski return false; 1346248f346fSJakub Kicinski 1347248f346fSJakub Kicinski return true; 1348248f346fSJakub Kicinski } 1349248f346fSJakub Kicinski 1350248f346fSJakub Kicinski static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type, 1351288b3de5SJakub Kicinski bool attach_drv) 135209756af4SAlexei Starovoitov { 135309756af4SAlexei Starovoitov struct fd f = fdget(ufd); 135409756af4SAlexei Starovoitov struct bpf_prog *prog; 135509756af4SAlexei Starovoitov 1356113214beSDaniel Borkmann prog = ____bpf_prog_get(f); 135709756af4SAlexei Starovoitov if (IS_ERR(prog)) 135809756af4SAlexei Starovoitov return prog; 1359288b3de5SJakub Kicinski if (!bpf_prog_get_ok(prog, attach_type, attach_drv)) { 1360113214beSDaniel Borkmann prog = ERR_PTR(-EINVAL); 1361113214beSDaniel Borkmann goto out; 1362113214beSDaniel Borkmann } 136309756af4SAlexei Starovoitov 136492117d84SAlexei Starovoitov prog = bpf_prog_inc(prog); 1365113214beSDaniel Borkmann out: 136609756af4SAlexei Starovoitov fdput(f); 136709756af4SAlexei Starovoitov return prog; 136809756af4SAlexei Starovoitov } 1369113214beSDaniel Borkmann 1370113214beSDaniel Borkmann struct bpf_prog *bpf_prog_get(u32 ufd) 1371113214beSDaniel Borkmann { 1372288b3de5SJakub Kicinski return __bpf_prog_get(ufd, NULL, false); 1373113214beSDaniel Borkmann } 1374113214beSDaniel Borkmann 1375248f346fSJakub Kicinski struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, 1376288b3de5SJakub Kicinski bool attach_drv) 1377248f346fSJakub Kicinski { 13784d220ed0SAlexei Starovoitov return __bpf_prog_get(ufd, &type, attach_drv); 1379248f346fSJakub Kicinski } 13806c8dfe21SJakub Kicinski EXPORT_SYMBOL_GPL(bpf_prog_get_type_dev); 1381248f346fSJakub Kicinski 1382aac3fc32SAndrey Ignatov /* Initially all BPF programs could be loaded w/o specifying 1383aac3fc32SAndrey Ignatov * expected_attach_type. Later for some of them specifying expected_attach_type 1384aac3fc32SAndrey Ignatov * at load time became required so that program could be validated properly. 1385aac3fc32SAndrey Ignatov * Programs of types that are allowed to be loaded both w/ and w/o (for 1386aac3fc32SAndrey Ignatov * backward compatibility) expected_attach_type, should have the default attach 1387aac3fc32SAndrey Ignatov * type assigned to expected_attach_type for the latter case, so that it can be 1388aac3fc32SAndrey Ignatov * validated later at attach time. 1389aac3fc32SAndrey Ignatov * 1390aac3fc32SAndrey Ignatov * bpf_prog_load_fixup_attach_type() sets expected_attach_type in @attr if 1391aac3fc32SAndrey Ignatov * prog type requires it but has some attach types that have to be backward 1392aac3fc32SAndrey Ignatov * compatible. 1393aac3fc32SAndrey Ignatov */ 1394aac3fc32SAndrey Ignatov static void bpf_prog_load_fixup_attach_type(union bpf_attr *attr) 1395aac3fc32SAndrey Ignatov { 1396aac3fc32SAndrey Ignatov switch (attr->prog_type) { 1397aac3fc32SAndrey Ignatov case BPF_PROG_TYPE_CGROUP_SOCK: 1398aac3fc32SAndrey Ignatov /* Unfortunately BPF_ATTACH_TYPE_UNSPEC enumeration doesn't 1399aac3fc32SAndrey Ignatov * exist so checking for non-zero is the way to go here. 1400aac3fc32SAndrey Ignatov */ 1401aac3fc32SAndrey Ignatov if (!attr->expected_attach_type) 1402aac3fc32SAndrey Ignatov attr->expected_attach_type = 1403aac3fc32SAndrey Ignatov BPF_CGROUP_INET_SOCK_CREATE; 1404aac3fc32SAndrey Ignatov break; 1405aac3fc32SAndrey Ignatov } 1406aac3fc32SAndrey Ignatov } 1407aac3fc32SAndrey Ignatov 14085e43f899SAndrey Ignatov static int 14095e43f899SAndrey Ignatov bpf_prog_load_check_attach_type(enum bpf_prog_type prog_type, 14105e43f899SAndrey Ignatov enum bpf_attach_type expected_attach_type) 14115e43f899SAndrey Ignatov { 14124fbac77dSAndrey Ignatov switch (prog_type) { 1413aac3fc32SAndrey Ignatov case BPF_PROG_TYPE_CGROUP_SOCK: 1414aac3fc32SAndrey Ignatov switch (expected_attach_type) { 1415aac3fc32SAndrey Ignatov case BPF_CGROUP_INET_SOCK_CREATE: 1416aac3fc32SAndrey Ignatov case BPF_CGROUP_INET4_POST_BIND: 1417aac3fc32SAndrey Ignatov case BPF_CGROUP_INET6_POST_BIND: 1418aac3fc32SAndrey Ignatov return 0; 1419aac3fc32SAndrey Ignatov default: 1420aac3fc32SAndrey Ignatov return -EINVAL; 1421aac3fc32SAndrey Ignatov } 14224fbac77dSAndrey Ignatov case BPF_PROG_TYPE_CGROUP_SOCK_ADDR: 14234fbac77dSAndrey Ignatov switch (expected_attach_type) { 14244fbac77dSAndrey Ignatov case BPF_CGROUP_INET4_BIND: 14254fbac77dSAndrey Ignatov case BPF_CGROUP_INET6_BIND: 1426d74bad4eSAndrey Ignatov case BPF_CGROUP_INET4_CONNECT: 1427d74bad4eSAndrey Ignatov case BPF_CGROUP_INET6_CONNECT: 14281cedee13SAndrey Ignatov case BPF_CGROUP_UDP4_SENDMSG: 14291cedee13SAndrey Ignatov case BPF_CGROUP_UDP6_SENDMSG: 14305e43f899SAndrey Ignatov return 0; 14314fbac77dSAndrey Ignatov default: 14324fbac77dSAndrey Ignatov return -EINVAL; 14334fbac77dSAndrey Ignatov } 14344fbac77dSAndrey Ignatov default: 14354fbac77dSAndrey Ignatov return 0; 14364fbac77dSAndrey Ignatov } 14375e43f899SAndrey Ignatov } 14385e43f899SAndrey Ignatov 143909756af4SAlexei Starovoitov /* last field in 'union bpf_attr' used by this command */ 14405e43f899SAndrey Ignatov #define BPF_PROG_LOAD_LAST_FIELD expected_attach_type 144109756af4SAlexei Starovoitov 144209756af4SAlexei Starovoitov static int bpf_prog_load(union bpf_attr *attr) 144309756af4SAlexei Starovoitov { 144409756af4SAlexei Starovoitov enum bpf_prog_type type = attr->prog_type; 144509756af4SAlexei Starovoitov struct bpf_prog *prog; 144609756af4SAlexei Starovoitov int err; 144709756af4SAlexei Starovoitov char license[128]; 144809756af4SAlexei Starovoitov bool is_gpl; 144909756af4SAlexei Starovoitov 145009756af4SAlexei Starovoitov if (CHECK_ATTR(BPF_PROG_LOAD)) 145109756af4SAlexei Starovoitov return -EINVAL; 145209756af4SAlexei Starovoitov 1453e07b98d9SDavid S. Miller if (attr->prog_flags & ~BPF_F_STRICT_ALIGNMENT) 1454e07b98d9SDavid S. Miller return -EINVAL; 1455e07b98d9SDavid S. Miller 145609756af4SAlexei Starovoitov /* copy eBPF program license from user space */ 1457535e7b4bSMickaël Salaün if (strncpy_from_user(license, u64_to_user_ptr(attr->license), 145809756af4SAlexei Starovoitov sizeof(license) - 1) < 0) 145909756af4SAlexei Starovoitov return -EFAULT; 146009756af4SAlexei Starovoitov license[sizeof(license) - 1] = 0; 146109756af4SAlexei Starovoitov 146209756af4SAlexei Starovoitov /* eBPF programs must be GPL compatible to use GPL-ed functions */ 146309756af4SAlexei Starovoitov is_gpl = license_is_gpl_compatible(license); 146409756af4SAlexei Starovoitov 1465ef0915caSDaniel Borkmann if (attr->insn_cnt == 0 || attr->insn_cnt > BPF_MAXINSNS) 1466ef0915caSDaniel Borkmann return -E2BIG; 146709756af4SAlexei Starovoitov 14682541517cSAlexei Starovoitov if (type == BPF_PROG_TYPE_KPROBE && 14692541517cSAlexei Starovoitov attr->kern_version != LINUX_VERSION_CODE) 14702541517cSAlexei Starovoitov return -EINVAL; 14712541517cSAlexei Starovoitov 147280b7d819SChenbo Feng if (type != BPF_PROG_TYPE_SOCKET_FILTER && 147380b7d819SChenbo Feng type != BPF_PROG_TYPE_CGROUP_SKB && 147480b7d819SChenbo Feng !capable(CAP_SYS_ADMIN)) 14751be7f75dSAlexei Starovoitov return -EPERM; 14761be7f75dSAlexei Starovoitov 1477aac3fc32SAndrey Ignatov bpf_prog_load_fixup_attach_type(attr); 14785e43f899SAndrey Ignatov if (bpf_prog_load_check_attach_type(type, attr->expected_attach_type)) 14795e43f899SAndrey Ignatov return -EINVAL; 14805e43f899SAndrey Ignatov 148109756af4SAlexei Starovoitov /* plain bpf_prog allocation */ 148209756af4SAlexei Starovoitov prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER); 148309756af4SAlexei Starovoitov if (!prog) 148409756af4SAlexei Starovoitov return -ENOMEM; 148509756af4SAlexei Starovoitov 14865e43f899SAndrey Ignatov prog->expected_attach_type = attr->expected_attach_type; 14875e43f899SAndrey Ignatov 14889a18eedbSJakub Kicinski prog->aux->offload_requested = !!attr->prog_ifindex; 14899a18eedbSJakub Kicinski 1490afdb09c7SChenbo Feng err = security_bpf_prog_alloc(prog->aux); 1491aaac3ba9SAlexei Starovoitov if (err) 1492aaac3ba9SAlexei Starovoitov goto free_prog_nouncharge; 1493aaac3ba9SAlexei Starovoitov 1494afdb09c7SChenbo Feng err = bpf_prog_charge_memlock(prog); 1495afdb09c7SChenbo Feng if (err) 1496afdb09c7SChenbo Feng goto free_prog_sec; 1497afdb09c7SChenbo Feng 149809756af4SAlexei Starovoitov prog->len = attr->insn_cnt; 149909756af4SAlexei Starovoitov 150009756af4SAlexei Starovoitov err = -EFAULT; 1501535e7b4bSMickaël Salaün if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns), 1502aafe6ae9SDaniel Borkmann bpf_prog_insn_size(prog)) != 0) 150309756af4SAlexei Starovoitov goto free_prog; 150409756af4SAlexei Starovoitov 150509756af4SAlexei Starovoitov prog->orig_prog = NULL; 1506a91263d5SDaniel Borkmann prog->jited = 0; 150709756af4SAlexei Starovoitov 150809756af4SAlexei Starovoitov atomic_set(&prog->aux->refcnt, 1); 1509a91263d5SDaniel Borkmann prog->gpl_compatible = is_gpl ? 1 : 0; 151009756af4SAlexei Starovoitov 15119a18eedbSJakub Kicinski if (bpf_prog_is_dev_bound(prog->aux)) { 1512ab3f0063SJakub Kicinski err = bpf_prog_offload_init(prog, attr); 1513ab3f0063SJakub Kicinski if (err) 1514ab3f0063SJakub Kicinski goto free_prog; 1515ab3f0063SJakub Kicinski } 1516ab3f0063SJakub Kicinski 151709756af4SAlexei Starovoitov /* find program type: socket_filter vs tracing_filter */ 151809756af4SAlexei Starovoitov err = find_prog_type(type, prog); 151909756af4SAlexei Starovoitov if (err < 0) 152009756af4SAlexei Starovoitov goto free_prog; 152109756af4SAlexei Starovoitov 1522cb4d2b3fSMartin KaFai Lau prog->aux->load_time = ktime_get_boot_ns(); 1523cb4d2b3fSMartin KaFai Lau err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name); 1524cb4d2b3fSMartin KaFai Lau if (err) 1525cb4d2b3fSMartin KaFai Lau goto free_prog; 1526cb4d2b3fSMartin KaFai Lau 152709756af4SAlexei Starovoitov /* run eBPF verifier */ 15289bac3d6dSAlexei Starovoitov err = bpf_check(&prog, attr); 152909756af4SAlexei Starovoitov if (err < 0) 153009756af4SAlexei Starovoitov goto free_used_maps; 153109756af4SAlexei Starovoitov 1532d1c55ab5SDaniel Borkmann prog = bpf_prog_select_runtime(prog, &err); 153304fd61abSAlexei Starovoitov if (err < 0) 153404fd61abSAlexei Starovoitov goto free_used_maps; 153509756af4SAlexei Starovoitov 1536dc4bb0e2SMartin KaFai Lau err = bpf_prog_alloc_id(prog); 1537dc4bb0e2SMartin KaFai Lau if (err) 1538dc4bb0e2SMartin KaFai Lau goto free_used_maps; 1539dc4bb0e2SMartin KaFai Lau 1540aa79781bSDaniel Borkmann err = bpf_prog_new_fd(prog); 1541b16d9aa4SMartin KaFai Lau if (err < 0) { 1542b16d9aa4SMartin KaFai Lau /* failed to allocate fd. 1543b16d9aa4SMartin KaFai Lau * bpf_prog_put() is needed because the above 1544b16d9aa4SMartin KaFai Lau * bpf_prog_alloc_id() has published the prog 1545b16d9aa4SMartin KaFai Lau * to the userspace and the userspace may 1546b16d9aa4SMartin KaFai Lau * have refcnt-ed it through BPF_PROG_GET_FD_BY_ID. 1547b16d9aa4SMartin KaFai Lau */ 1548b16d9aa4SMartin KaFai Lau bpf_prog_put(prog); 1549b16d9aa4SMartin KaFai Lau return err; 1550b16d9aa4SMartin KaFai Lau } 155109756af4SAlexei Starovoitov 155274451e66SDaniel Borkmann bpf_prog_kallsyms_add(prog); 155309756af4SAlexei Starovoitov return err; 155409756af4SAlexei Starovoitov 155509756af4SAlexei Starovoitov free_used_maps: 15567d1982b4SDaniel Borkmann bpf_prog_kallsyms_del_subprogs(prog); 155709756af4SAlexei Starovoitov free_used_maps(prog->aux); 155809756af4SAlexei Starovoitov free_prog: 1559aaac3ba9SAlexei Starovoitov bpf_prog_uncharge_memlock(prog); 1560afdb09c7SChenbo Feng free_prog_sec: 1561afdb09c7SChenbo Feng security_bpf_prog_free(prog->aux); 1562aaac3ba9SAlexei Starovoitov free_prog_nouncharge: 156309756af4SAlexei Starovoitov bpf_prog_free(prog); 156409756af4SAlexei Starovoitov return err; 156509756af4SAlexei Starovoitov } 156609756af4SAlexei Starovoitov 15676e71b04aSChenbo Feng #define BPF_OBJ_LAST_FIELD file_flags 1568b2197755SDaniel Borkmann 1569b2197755SDaniel Borkmann static int bpf_obj_pin(const union bpf_attr *attr) 1570b2197755SDaniel Borkmann { 15716e71b04aSChenbo Feng if (CHECK_ATTR(BPF_OBJ) || attr->file_flags != 0) 1572b2197755SDaniel Borkmann return -EINVAL; 1573b2197755SDaniel Borkmann 1574535e7b4bSMickaël Salaün return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname)); 1575b2197755SDaniel Borkmann } 1576b2197755SDaniel Borkmann 1577b2197755SDaniel Borkmann static int bpf_obj_get(const union bpf_attr *attr) 1578b2197755SDaniel Borkmann { 15796e71b04aSChenbo Feng if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0 || 15806e71b04aSChenbo Feng attr->file_flags & ~BPF_OBJ_FLAG_MASK) 1581b2197755SDaniel Borkmann return -EINVAL; 1582b2197755SDaniel Borkmann 15836e71b04aSChenbo Feng return bpf_obj_get_user(u64_to_user_ptr(attr->pathname), 15846e71b04aSChenbo Feng attr->file_flags); 1585b2197755SDaniel Borkmann } 1586b2197755SDaniel Borkmann 1587c4f6699dSAlexei Starovoitov struct bpf_raw_tracepoint { 1588c4f6699dSAlexei Starovoitov struct bpf_raw_event_map *btp; 1589c4f6699dSAlexei Starovoitov struct bpf_prog *prog; 1590c4f6699dSAlexei Starovoitov }; 1591c4f6699dSAlexei Starovoitov 1592c4f6699dSAlexei Starovoitov static int bpf_raw_tracepoint_release(struct inode *inode, struct file *filp) 1593c4f6699dSAlexei Starovoitov { 1594c4f6699dSAlexei Starovoitov struct bpf_raw_tracepoint *raw_tp = filp->private_data; 1595c4f6699dSAlexei Starovoitov 1596c4f6699dSAlexei Starovoitov if (raw_tp->prog) { 1597c4f6699dSAlexei Starovoitov bpf_probe_unregister(raw_tp->btp, raw_tp->prog); 1598c4f6699dSAlexei Starovoitov bpf_prog_put(raw_tp->prog); 1599c4f6699dSAlexei Starovoitov } 1600c4f6699dSAlexei Starovoitov kfree(raw_tp); 1601c4f6699dSAlexei Starovoitov return 0; 1602c4f6699dSAlexei Starovoitov } 1603c4f6699dSAlexei Starovoitov 1604c4f6699dSAlexei Starovoitov static const struct file_operations bpf_raw_tp_fops = { 1605c4f6699dSAlexei Starovoitov .release = bpf_raw_tracepoint_release, 1606c4f6699dSAlexei Starovoitov .read = bpf_dummy_read, 1607c4f6699dSAlexei Starovoitov .write = bpf_dummy_write, 1608c4f6699dSAlexei Starovoitov }; 1609c4f6699dSAlexei Starovoitov 1610c4f6699dSAlexei Starovoitov #define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.prog_fd 1611c4f6699dSAlexei Starovoitov 1612c4f6699dSAlexei Starovoitov static int bpf_raw_tracepoint_open(const union bpf_attr *attr) 1613c4f6699dSAlexei Starovoitov { 1614c4f6699dSAlexei Starovoitov struct bpf_raw_tracepoint *raw_tp; 1615c4f6699dSAlexei Starovoitov struct bpf_raw_event_map *btp; 1616c4f6699dSAlexei Starovoitov struct bpf_prog *prog; 1617c4f6699dSAlexei Starovoitov char tp_name[128]; 1618c4f6699dSAlexei Starovoitov int tp_fd, err; 1619c4f6699dSAlexei Starovoitov 1620c4f6699dSAlexei Starovoitov if (strncpy_from_user(tp_name, u64_to_user_ptr(attr->raw_tracepoint.name), 1621c4f6699dSAlexei Starovoitov sizeof(tp_name) - 1) < 0) 1622c4f6699dSAlexei Starovoitov return -EFAULT; 1623c4f6699dSAlexei Starovoitov tp_name[sizeof(tp_name) - 1] = 0; 1624c4f6699dSAlexei Starovoitov 1625c4f6699dSAlexei Starovoitov btp = bpf_find_raw_tracepoint(tp_name); 1626c4f6699dSAlexei Starovoitov if (!btp) 1627c4f6699dSAlexei Starovoitov return -ENOENT; 1628c4f6699dSAlexei Starovoitov 1629c4f6699dSAlexei Starovoitov raw_tp = kzalloc(sizeof(*raw_tp), GFP_USER); 1630c4f6699dSAlexei Starovoitov if (!raw_tp) 1631c4f6699dSAlexei Starovoitov return -ENOMEM; 1632c4f6699dSAlexei Starovoitov raw_tp->btp = btp; 1633c4f6699dSAlexei Starovoitov 1634c4f6699dSAlexei Starovoitov prog = bpf_prog_get_type(attr->raw_tracepoint.prog_fd, 1635c4f6699dSAlexei Starovoitov BPF_PROG_TYPE_RAW_TRACEPOINT); 1636c4f6699dSAlexei Starovoitov if (IS_ERR(prog)) { 1637c4f6699dSAlexei Starovoitov err = PTR_ERR(prog); 1638c4f6699dSAlexei Starovoitov goto out_free_tp; 1639c4f6699dSAlexei Starovoitov } 1640c4f6699dSAlexei Starovoitov 1641c4f6699dSAlexei Starovoitov err = bpf_probe_register(raw_tp->btp, prog); 1642c4f6699dSAlexei Starovoitov if (err) 1643c4f6699dSAlexei Starovoitov goto out_put_prog; 1644c4f6699dSAlexei Starovoitov 1645c4f6699dSAlexei Starovoitov raw_tp->prog = prog; 1646c4f6699dSAlexei Starovoitov tp_fd = anon_inode_getfd("bpf-raw-tracepoint", &bpf_raw_tp_fops, raw_tp, 1647c4f6699dSAlexei Starovoitov O_CLOEXEC); 1648c4f6699dSAlexei Starovoitov if (tp_fd < 0) { 1649c4f6699dSAlexei Starovoitov bpf_probe_unregister(raw_tp->btp, prog); 1650c4f6699dSAlexei Starovoitov err = tp_fd; 1651c4f6699dSAlexei Starovoitov goto out_put_prog; 1652c4f6699dSAlexei Starovoitov } 1653c4f6699dSAlexei Starovoitov return tp_fd; 1654c4f6699dSAlexei Starovoitov 1655c4f6699dSAlexei Starovoitov out_put_prog: 1656c4f6699dSAlexei Starovoitov bpf_prog_put(prog); 1657c4f6699dSAlexei Starovoitov out_free_tp: 1658c4f6699dSAlexei Starovoitov kfree(raw_tp); 1659c4f6699dSAlexei Starovoitov return err; 1660c4f6699dSAlexei Starovoitov } 1661c4f6699dSAlexei Starovoitov 166233491588SAnders Roxell static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog, 166333491588SAnders Roxell enum bpf_attach_type attach_type) 166433491588SAnders Roxell { 166533491588SAnders Roxell switch (prog->type) { 166633491588SAnders Roxell case BPF_PROG_TYPE_CGROUP_SOCK: 166733491588SAnders Roxell case BPF_PROG_TYPE_CGROUP_SOCK_ADDR: 166833491588SAnders Roxell return attach_type == prog->expected_attach_type ? 0 : -EINVAL; 166933491588SAnders Roxell default: 167033491588SAnders Roxell return 0; 167133491588SAnders Roxell } 167233491588SAnders Roxell } 167333491588SAnders Roxell 1674464bc0fdSJohn Fastabend #define BPF_PROG_ATTACH_LAST_FIELD attach_flags 1675174a79ffSJohn Fastabend 1676324bda9eSAlexei Starovoitov #define BPF_F_ATTACH_MASK \ 1677324bda9eSAlexei Starovoitov (BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI) 1678324bda9eSAlexei Starovoitov 1679f4324551SDaniel Mack static int bpf_prog_attach(const union bpf_attr *attr) 1680f4324551SDaniel Mack { 16817f677633SAlexei Starovoitov enum bpf_prog_type ptype; 1682f4324551SDaniel Mack struct bpf_prog *prog; 16837f677633SAlexei Starovoitov int ret; 1684f4324551SDaniel Mack 1685f4324551SDaniel Mack if (!capable(CAP_NET_ADMIN)) 1686f4324551SDaniel Mack return -EPERM; 1687f4324551SDaniel Mack 1688f4324551SDaniel Mack if (CHECK_ATTR(BPF_PROG_ATTACH)) 1689f4324551SDaniel Mack return -EINVAL; 1690f4324551SDaniel Mack 1691324bda9eSAlexei Starovoitov if (attr->attach_flags & ~BPF_F_ATTACH_MASK) 16927f677633SAlexei Starovoitov return -EINVAL; 16937f677633SAlexei Starovoitov 1694f4324551SDaniel Mack switch (attr->attach_type) { 1695f4324551SDaniel Mack case BPF_CGROUP_INET_INGRESS: 1696f4324551SDaniel Mack case BPF_CGROUP_INET_EGRESS: 1697b2cd1257SDavid Ahern ptype = BPF_PROG_TYPE_CGROUP_SKB; 1698b2cd1257SDavid Ahern break; 169961023658SDavid Ahern case BPF_CGROUP_INET_SOCK_CREATE: 1700aac3fc32SAndrey Ignatov case BPF_CGROUP_INET4_POST_BIND: 1701aac3fc32SAndrey Ignatov case BPF_CGROUP_INET6_POST_BIND: 170261023658SDavid Ahern ptype = BPF_PROG_TYPE_CGROUP_SOCK; 170361023658SDavid Ahern break; 17044fbac77dSAndrey Ignatov case BPF_CGROUP_INET4_BIND: 17054fbac77dSAndrey Ignatov case BPF_CGROUP_INET6_BIND: 1706d74bad4eSAndrey Ignatov case BPF_CGROUP_INET4_CONNECT: 1707d74bad4eSAndrey Ignatov case BPF_CGROUP_INET6_CONNECT: 17081cedee13SAndrey Ignatov case BPF_CGROUP_UDP4_SENDMSG: 17091cedee13SAndrey Ignatov case BPF_CGROUP_UDP6_SENDMSG: 17104fbac77dSAndrey Ignatov ptype = BPF_PROG_TYPE_CGROUP_SOCK_ADDR; 17114fbac77dSAndrey Ignatov break; 171240304b2aSLawrence Brakmo case BPF_CGROUP_SOCK_OPS: 171340304b2aSLawrence Brakmo ptype = BPF_PROG_TYPE_SOCK_OPS; 171440304b2aSLawrence Brakmo break; 1715ebc614f6SRoman Gushchin case BPF_CGROUP_DEVICE: 1716ebc614f6SRoman Gushchin ptype = BPF_PROG_TYPE_CGROUP_DEVICE; 1717ebc614f6SRoman Gushchin break; 17184f738adbSJohn Fastabend case BPF_SK_MSG_VERDICT: 1719fdb5c453SSean Young ptype = BPF_PROG_TYPE_SK_MSG; 1720fdb5c453SSean Young break; 1721464bc0fdSJohn Fastabend case BPF_SK_SKB_STREAM_PARSER: 1722464bc0fdSJohn Fastabend case BPF_SK_SKB_STREAM_VERDICT: 1723fdb5c453SSean Young ptype = BPF_PROG_TYPE_SK_SKB; 1724fdb5c453SSean Young break; 1725f4364dcfSSean Young case BPF_LIRC_MODE2: 1726fdb5c453SSean Young ptype = BPF_PROG_TYPE_LIRC_MODE2; 1727fdb5c453SSean Young break; 1728d58e468bSPetar Penkov case BPF_FLOW_DISSECTOR: 1729d58e468bSPetar Penkov ptype = BPF_PROG_TYPE_FLOW_DISSECTOR; 1730d58e468bSPetar Penkov break; 1731b2cd1257SDavid Ahern default: 1732b2cd1257SDavid Ahern return -EINVAL; 1733b2cd1257SDavid Ahern } 1734b2cd1257SDavid Ahern 1735b2cd1257SDavid Ahern prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype); 1736f4324551SDaniel Mack if (IS_ERR(prog)) 1737f4324551SDaniel Mack return PTR_ERR(prog); 1738f4324551SDaniel Mack 17395e43f899SAndrey Ignatov if (bpf_prog_attach_check_attach_type(prog, attr->attach_type)) { 17405e43f899SAndrey Ignatov bpf_prog_put(prog); 17415e43f899SAndrey Ignatov return -EINVAL; 17425e43f899SAndrey Ignatov } 17435e43f899SAndrey Ignatov 1744fdb5c453SSean Young switch (ptype) { 1745fdb5c453SSean Young case BPF_PROG_TYPE_SK_SKB: 1746fdb5c453SSean Young case BPF_PROG_TYPE_SK_MSG: 1747604326b4SDaniel Borkmann ret = sock_map_get_from_fd(attr, prog); 1748fdb5c453SSean Young break; 1749fdb5c453SSean Young case BPF_PROG_TYPE_LIRC_MODE2: 1750fdb5c453SSean Young ret = lirc_prog_attach(attr, prog); 1751fdb5c453SSean Young break; 1752d58e468bSPetar Penkov case BPF_PROG_TYPE_FLOW_DISSECTOR: 1753d58e468bSPetar Penkov ret = skb_flow_dissector_bpf_prog_attach(attr, prog); 1754d58e468bSPetar Penkov break; 1755fdb5c453SSean Young default: 1756fdb5c453SSean Young ret = cgroup_bpf_prog_attach(attr, ptype, prog); 1757f4324551SDaniel Mack } 1758f4324551SDaniel Mack 17597f677633SAlexei Starovoitov if (ret) 17607f677633SAlexei Starovoitov bpf_prog_put(prog); 17617f677633SAlexei Starovoitov return ret; 1762f4324551SDaniel Mack } 1763f4324551SDaniel Mack 1764f4324551SDaniel Mack #define BPF_PROG_DETACH_LAST_FIELD attach_type 1765f4324551SDaniel Mack 1766f4324551SDaniel Mack static int bpf_prog_detach(const union bpf_attr *attr) 1767f4324551SDaniel Mack { 1768324bda9eSAlexei Starovoitov enum bpf_prog_type ptype; 1769f4324551SDaniel Mack 1770f4324551SDaniel Mack if (!capable(CAP_NET_ADMIN)) 1771f4324551SDaniel Mack return -EPERM; 1772f4324551SDaniel Mack 1773f4324551SDaniel Mack if (CHECK_ATTR(BPF_PROG_DETACH)) 1774f4324551SDaniel Mack return -EINVAL; 1775f4324551SDaniel Mack 1776f4324551SDaniel Mack switch (attr->attach_type) { 1777f4324551SDaniel Mack case BPF_CGROUP_INET_INGRESS: 1778f4324551SDaniel Mack case BPF_CGROUP_INET_EGRESS: 1779324bda9eSAlexei Starovoitov ptype = BPF_PROG_TYPE_CGROUP_SKB; 1780324bda9eSAlexei Starovoitov break; 178161023658SDavid Ahern case BPF_CGROUP_INET_SOCK_CREATE: 1782aac3fc32SAndrey Ignatov case BPF_CGROUP_INET4_POST_BIND: 1783aac3fc32SAndrey Ignatov case BPF_CGROUP_INET6_POST_BIND: 1784324bda9eSAlexei Starovoitov ptype = BPF_PROG_TYPE_CGROUP_SOCK; 1785324bda9eSAlexei Starovoitov break; 17864fbac77dSAndrey Ignatov case BPF_CGROUP_INET4_BIND: 17874fbac77dSAndrey Ignatov case BPF_CGROUP_INET6_BIND: 1788d74bad4eSAndrey Ignatov case BPF_CGROUP_INET4_CONNECT: 1789d74bad4eSAndrey Ignatov case BPF_CGROUP_INET6_CONNECT: 17901cedee13SAndrey Ignatov case BPF_CGROUP_UDP4_SENDMSG: 17911cedee13SAndrey Ignatov case BPF_CGROUP_UDP6_SENDMSG: 17924fbac77dSAndrey Ignatov ptype = BPF_PROG_TYPE_CGROUP_SOCK_ADDR; 17934fbac77dSAndrey Ignatov break; 179440304b2aSLawrence Brakmo case BPF_CGROUP_SOCK_OPS: 1795324bda9eSAlexei Starovoitov ptype = BPF_PROG_TYPE_SOCK_OPS; 1796f4324551SDaniel Mack break; 1797ebc614f6SRoman Gushchin case BPF_CGROUP_DEVICE: 1798ebc614f6SRoman Gushchin ptype = BPF_PROG_TYPE_CGROUP_DEVICE; 1799ebc614f6SRoman Gushchin break; 18004f738adbSJohn Fastabend case BPF_SK_MSG_VERDICT: 1801604326b4SDaniel Borkmann return sock_map_get_from_fd(attr, NULL); 18025a67da2aSJohn Fastabend case BPF_SK_SKB_STREAM_PARSER: 18035a67da2aSJohn Fastabend case BPF_SK_SKB_STREAM_VERDICT: 1804604326b4SDaniel Borkmann return sock_map_get_from_fd(attr, NULL); 1805f4364dcfSSean Young case BPF_LIRC_MODE2: 1806f4364dcfSSean Young return lirc_prog_detach(attr); 1807d58e468bSPetar Penkov case BPF_FLOW_DISSECTOR: 1808d58e468bSPetar Penkov return skb_flow_dissector_bpf_prog_detach(attr); 1809f4324551SDaniel Mack default: 1810f4324551SDaniel Mack return -EINVAL; 1811f4324551SDaniel Mack } 1812f4324551SDaniel Mack 1813fdb5c453SSean Young return cgroup_bpf_prog_detach(attr, ptype); 1814f4324551SDaniel Mack } 181540304b2aSLawrence Brakmo 1816468e2f64SAlexei Starovoitov #define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt 1817468e2f64SAlexei Starovoitov 1818468e2f64SAlexei Starovoitov static int bpf_prog_query(const union bpf_attr *attr, 1819468e2f64SAlexei Starovoitov union bpf_attr __user *uattr) 1820468e2f64SAlexei Starovoitov { 1821468e2f64SAlexei Starovoitov if (!capable(CAP_NET_ADMIN)) 1822468e2f64SAlexei Starovoitov return -EPERM; 1823468e2f64SAlexei Starovoitov if (CHECK_ATTR(BPF_PROG_QUERY)) 1824468e2f64SAlexei Starovoitov return -EINVAL; 1825468e2f64SAlexei Starovoitov if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE) 1826468e2f64SAlexei Starovoitov return -EINVAL; 1827468e2f64SAlexei Starovoitov 1828468e2f64SAlexei Starovoitov switch (attr->query.attach_type) { 1829468e2f64SAlexei Starovoitov case BPF_CGROUP_INET_INGRESS: 1830468e2f64SAlexei Starovoitov case BPF_CGROUP_INET_EGRESS: 1831468e2f64SAlexei Starovoitov case BPF_CGROUP_INET_SOCK_CREATE: 18324fbac77dSAndrey Ignatov case BPF_CGROUP_INET4_BIND: 18334fbac77dSAndrey Ignatov case BPF_CGROUP_INET6_BIND: 1834aac3fc32SAndrey Ignatov case BPF_CGROUP_INET4_POST_BIND: 1835aac3fc32SAndrey Ignatov case BPF_CGROUP_INET6_POST_BIND: 1836d74bad4eSAndrey Ignatov case BPF_CGROUP_INET4_CONNECT: 1837d74bad4eSAndrey Ignatov case BPF_CGROUP_INET6_CONNECT: 18381cedee13SAndrey Ignatov case BPF_CGROUP_UDP4_SENDMSG: 18391cedee13SAndrey Ignatov case BPF_CGROUP_UDP6_SENDMSG: 1840468e2f64SAlexei Starovoitov case BPF_CGROUP_SOCK_OPS: 1841ebc614f6SRoman Gushchin case BPF_CGROUP_DEVICE: 1842468e2f64SAlexei Starovoitov break; 1843f4364dcfSSean Young case BPF_LIRC_MODE2: 1844f4364dcfSSean Young return lirc_prog_query(attr, uattr); 1845468e2f64SAlexei Starovoitov default: 1846468e2f64SAlexei Starovoitov return -EINVAL; 1847468e2f64SAlexei Starovoitov } 1848fdb5c453SSean Young 1849fdb5c453SSean Young return cgroup_bpf_prog_query(attr, uattr); 1850468e2f64SAlexei Starovoitov } 1851f4324551SDaniel Mack 18521cf1cae9SAlexei Starovoitov #define BPF_PROG_TEST_RUN_LAST_FIELD test.duration 18531cf1cae9SAlexei Starovoitov 18541cf1cae9SAlexei Starovoitov static int bpf_prog_test_run(const union bpf_attr *attr, 18551cf1cae9SAlexei Starovoitov union bpf_attr __user *uattr) 18561cf1cae9SAlexei Starovoitov { 18571cf1cae9SAlexei Starovoitov struct bpf_prog *prog; 18581cf1cae9SAlexei Starovoitov int ret = -ENOTSUPP; 18591cf1cae9SAlexei Starovoitov 186061f3c964SAlexei Starovoitov if (!capable(CAP_SYS_ADMIN)) 186161f3c964SAlexei Starovoitov return -EPERM; 18621cf1cae9SAlexei Starovoitov if (CHECK_ATTR(BPF_PROG_TEST_RUN)) 18631cf1cae9SAlexei Starovoitov return -EINVAL; 18641cf1cae9SAlexei Starovoitov 18651cf1cae9SAlexei Starovoitov prog = bpf_prog_get(attr->test.prog_fd); 18661cf1cae9SAlexei Starovoitov if (IS_ERR(prog)) 18671cf1cae9SAlexei Starovoitov return PTR_ERR(prog); 18681cf1cae9SAlexei Starovoitov 18691cf1cae9SAlexei Starovoitov if (prog->aux->ops->test_run) 18701cf1cae9SAlexei Starovoitov ret = prog->aux->ops->test_run(prog, attr, uattr); 18711cf1cae9SAlexei Starovoitov 18721cf1cae9SAlexei Starovoitov bpf_prog_put(prog); 18731cf1cae9SAlexei Starovoitov return ret; 18741cf1cae9SAlexei Starovoitov } 18751cf1cae9SAlexei Starovoitov 187634ad5580SMartin KaFai Lau #define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id 187734ad5580SMartin KaFai Lau 187834ad5580SMartin KaFai Lau static int bpf_obj_get_next_id(const union bpf_attr *attr, 187934ad5580SMartin KaFai Lau union bpf_attr __user *uattr, 188034ad5580SMartin KaFai Lau struct idr *idr, 188134ad5580SMartin KaFai Lau spinlock_t *lock) 188234ad5580SMartin KaFai Lau { 188334ad5580SMartin KaFai Lau u32 next_id = attr->start_id; 188434ad5580SMartin KaFai Lau int err = 0; 188534ad5580SMartin KaFai Lau 188634ad5580SMartin KaFai Lau if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX) 188734ad5580SMartin KaFai Lau return -EINVAL; 188834ad5580SMartin KaFai Lau 188934ad5580SMartin KaFai Lau if (!capable(CAP_SYS_ADMIN)) 189034ad5580SMartin KaFai Lau return -EPERM; 189134ad5580SMartin KaFai Lau 189234ad5580SMartin KaFai Lau next_id++; 189334ad5580SMartin KaFai Lau spin_lock_bh(lock); 189434ad5580SMartin KaFai Lau if (!idr_get_next(idr, &next_id)) 189534ad5580SMartin KaFai Lau err = -ENOENT; 189634ad5580SMartin KaFai Lau spin_unlock_bh(lock); 189734ad5580SMartin KaFai Lau 189834ad5580SMartin KaFai Lau if (!err) 189934ad5580SMartin KaFai Lau err = put_user(next_id, &uattr->next_id); 190034ad5580SMartin KaFai Lau 190134ad5580SMartin KaFai Lau return err; 190234ad5580SMartin KaFai Lau } 190334ad5580SMartin KaFai Lau 1904b16d9aa4SMartin KaFai Lau #define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id 1905b16d9aa4SMartin KaFai Lau 1906b16d9aa4SMartin KaFai Lau static int bpf_prog_get_fd_by_id(const union bpf_attr *attr) 1907b16d9aa4SMartin KaFai Lau { 1908b16d9aa4SMartin KaFai Lau struct bpf_prog *prog; 1909b16d9aa4SMartin KaFai Lau u32 id = attr->prog_id; 1910b16d9aa4SMartin KaFai Lau int fd; 1911b16d9aa4SMartin KaFai Lau 1912b16d9aa4SMartin KaFai Lau if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID)) 1913b16d9aa4SMartin KaFai Lau return -EINVAL; 1914b16d9aa4SMartin KaFai Lau 1915b16d9aa4SMartin KaFai Lau if (!capable(CAP_SYS_ADMIN)) 1916b16d9aa4SMartin KaFai Lau return -EPERM; 1917b16d9aa4SMartin KaFai Lau 1918b16d9aa4SMartin KaFai Lau spin_lock_bh(&prog_idr_lock); 1919b16d9aa4SMartin KaFai Lau prog = idr_find(&prog_idr, id); 1920b16d9aa4SMartin KaFai Lau if (prog) 1921b16d9aa4SMartin KaFai Lau prog = bpf_prog_inc_not_zero(prog); 1922b16d9aa4SMartin KaFai Lau else 1923b16d9aa4SMartin KaFai Lau prog = ERR_PTR(-ENOENT); 1924b16d9aa4SMartin KaFai Lau spin_unlock_bh(&prog_idr_lock); 1925b16d9aa4SMartin KaFai Lau 1926b16d9aa4SMartin KaFai Lau if (IS_ERR(prog)) 1927b16d9aa4SMartin KaFai Lau return PTR_ERR(prog); 1928b16d9aa4SMartin KaFai Lau 1929b16d9aa4SMartin KaFai Lau fd = bpf_prog_new_fd(prog); 1930b16d9aa4SMartin KaFai Lau if (fd < 0) 1931b16d9aa4SMartin KaFai Lau bpf_prog_put(prog); 1932b16d9aa4SMartin KaFai Lau 1933b16d9aa4SMartin KaFai Lau return fd; 1934b16d9aa4SMartin KaFai Lau } 1935b16d9aa4SMartin KaFai Lau 19366e71b04aSChenbo Feng #define BPF_MAP_GET_FD_BY_ID_LAST_FIELD open_flags 1937bd5f5f4eSMartin KaFai Lau 1938bd5f5f4eSMartin KaFai Lau static int bpf_map_get_fd_by_id(const union bpf_attr *attr) 1939bd5f5f4eSMartin KaFai Lau { 1940bd5f5f4eSMartin KaFai Lau struct bpf_map *map; 1941bd5f5f4eSMartin KaFai Lau u32 id = attr->map_id; 19426e71b04aSChenbo Feng int f_flags; 1943bd5f5f4eSMartin KaFai Lau int fd; 1944bd5f5f4eSMartin KaFai Lau 19456e71b04aSChenbo Feng if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID) || 19466e71b04aSChenbo Feng attr->open_flags & ~BPF_OBJ_FLAG_MASK) 1947bd5f5f4eSMartin KaFai Lau return -EINVAL; 1948bd5f5f4eSMartin KaFai Lau 1949bd5f5f4eSMartin KaFai Lau if (!capable(CAP_SYS_ADMIN)) 1950bd5f5f4eSMartin KaFai Lau return -EPERM; 1951bd5f5f4eSMartin KaFai Lau 19526e71b04aSChenbo Feng f_flags = bpf_get_file_flag(attr->open_flags); 19536e71b04aSChenbo Feng if (f_flags < 0) 19546e71b04aSChenbo Feng return f_flags; 19556e71b04aSChenbo Feng 1956bd5f5f4eSMartin KaFai Lau spin_lock_bh(&map_idr_lock); 1957bd5f5f4eSMartin KaFai Lau map = idr_find(&map_idr, id); 1958bd5f5f4eSMartin KaFai Lau if (map) 1959bd5f5f4eSMartin KaFai Lau map = bpf_map_inc_not_zero(map, true); 1960bd5f5f4eSMartin KaFai Lau else 1961bd5f5f4eSMartin KaFai Lau map = ERR_PTR(-ENOENT); 1962bd5f5f4eSMartin KaFai Lau spin_unlock_bh(&map_idr_lock); 1963bd5f5f4eSMartin KaFai Lau 1964bd5f5f4eSMartin KaFai Lau if (IS_ERR(map)) 1965bd5f5f4eSMartin KaFai Lau return PTR_ERR(map); 1966bd5f5f4eSMartin KaFai Lau 19676e71b04aSChenbo Feng fd = bpf_map_new_fd(map, f_flags); 1968bd5f5f4eSMartin KaFai Lau if (fd < 0) 1969bd5f5f4eSMartin KaFai Lau bpf_map_put(map); 1970bd5f5f4eSMartin KaFai Lau 1971bd5f5f4eSMartin KaFai Lau return fd; 1972bd5f5f4eSMartin KaFai Lau } 1973bd5f5f4eSMartin KaFai Lau 19747105e828SDaniel Borkmann static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog, 19757105e828SDaniel Borkmann unsigned long addr) 19767105e828SDaniel Borkmann { 19777105e828SDaniel Borkmann int i; 19787105e828SDaniel Borkmann 19797105e828SDaniel Borkmann for (i = 0; i < prog->aux->used_map_cnt; i++) 19807105e828SDaniel Borkmann if (prog->aux->used_maps[i] == (void *)addr) 19817105e828SDaniel Borkmann return prog->aux->used_maps[i]; 19827105e828SDaniel Borkmann return NULL; 19837105e828SDaniel Borkmann } 19847105e828SDaniel Borkmann 19857105e828SDaniel Borkmann static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog) 19867105e828SDaniel Borkmann { 19877105e828SDaniel Borkmann const struct bpf_map *map; 19887105e828SDaniel Borkmann struct bpf_insn *insns; 19897105e828SDaniel Borkmann u64 imm; 19907105e828SDaniel Borkmann int i; 19917105e828SDaniel Borkmann 19927105e828SDaniel Borkmann insns = kmemdup(prog->insnsi, bpf_prog_insn_size(prog), 19937105e828SDaniel Borkmann GFP_USER); 19947105e828SDaniel Borkmann if (!insns) 19957105e828SDaniel Borkmann return insns; 19967105e828SDaniel Borkmann 19977105e828SDaniel Borkmann for (i = 0; i < prog->len; i++) { 19987105e828SDaniel Borkmann if (insns[i].code == (BPF_JMP | BPF_TAIL_CALL)) { 19997105e828SDaniel Borkmann insns[i].code = BPF_JMP | BPF_CALL; 20007105e828SDaniel Borkmann insns[i].imm = BPF_FUNC_tail_call; 20017105e828SDaniel Borkmann /* fall-through */ 20027105e828SDaniel Borkmann } 20037105e828SDaniel Borkmann if (insns[i].code == (BPF_JMP | BPF_CALL) || 20047105e828SDaniel Borkmann insns[i].code == (BPF_JMP | BPF_CALL_ARGS)) { 20057105e828SDaniel Borkmann if (insns[i].code == (BPF_JMP | BPF_CALL_ARGS)) 20067105e828SDaniel Borkmann insns[i].code = BPF_JMP | BPF_CALL; 20077105e828SDaniel Borkmann if (!bpf_dump_raw_ok()) 20087105e828SDaniel Borkmann insns[i].imm = 0; 20097105e828SDaniel Borkmann continue; 20107105e828SDaniel Borkmann } 20117105e828SDaniel Borkmann 20127105e828SDaniel Borkmann if (insns[i].code != (BPF_LD | BPF_IMM | BPF_DW)) 20137105e828SDaniel Borkmann continue; 20147105e828SDaniel Borkmann 20157105e828SDaniel Borkmann imm = ((u64)insns[i + 1].imm << 32) | (u32)insns[i].imm; 20167105e828SDaniel Borkmann map = bpf_map_from_imm(prog, imm); 20177105e828SDaniel Borkmann if (map) { 20187105e828SDaniel Borkmann insns[i].src_reg = BPF_PSEUDO_MAP_FD; 20197105e828SDaniel Borkmann insns[i].imm = map->id; 20207105e828SDaniel Borkmann insns[i + 1].imm = 0; 20217105e828SDaniel Borkmann continue; 20227105e828SDaniel Borkmann } 20237105e828SDaniel Borkmann 20247105e828SDaniel Borkmann if (!bpf_dump_raw_ok() && 20257105e828SDaniel Borkmann imm == (unsigned long)prog->aux) { 20267105e828SDaniel Borkmann insns[i].imm = 0; 20277105e828SDaniel Borkmann insns[i + 1].imm = 0; 20287105e828SDaniel Borkmann continue; 20297105e828SDaniel Borkmann } 20307105e828SDaniel Borkmann } 20317105e828SDaniel Borkmann 20327105e828SDaniel Borkmann return insns; 20337105e828SDaniel Borkmann } 20347105e828SDaniel Borkmann 20351e270976SMartin KaFai Lau static int bpf_prog_get_info_by_fd(struct bpf_prog *prog, 20361e270976SMartin KaFai Lau const union bpf_attr *attr, 20371e270976SMartin KaFai Lau union bpf_attr __user *uattr) 20381e270976SMartin KaFai Lau { 20391e270976SMartin KaFai Lau struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info); 20401e270976SMartin KaFai Lau struct bpf_prog_info info = {}; 20411e270976SMartin KaFai Lau u32 info_len = attr->info.info_len; 20421e270976SMartin KaFai Lau char __user *uinsns; 20431e270976SMartin KaFai Lau u32 ulen; 20441e270976SMartin KaFai Lau int err; 20451e270976SMartin KaFai Lau 2046dcab51f1SMartin KaFai Lau err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len); 20471e270976SMartin KaFai Lau if (err) 20481e270976SMartin KaFai Lau return err; 20491e270976SMartin KaFai Lau info_len = min_t(u32, sizeof(info), info_len); 20501e270976SMartin KaFai Lau 20511e270976SMartin KaFai Lau if (copy_from_user(&info, uinfo, info_len)) 205289b09689SDaniel Borkmann return -EFAULT; 20531e270976SMartin KaFai Lau 20541e270976SMartin KaFai Lau info.type = prog->type; 20551e270976SMartin KaFai Lau info.id = prog->aux->id; 2056cb4d2b3fSMartin KaFai Lau info.load_time = prog->aux->load_time; 2057cb4d2b3fSMartin KaFai Lau info.created_by_uid = from_kuid_munged(current_user_ns(), 2058cb4d2b3fSMartin KaFai Lau prog->aux->user->uid); 2059b85fab0eSJiri Olsa info.gpl_compatible = prog->gpl_compatible; 20601e270976SMartin KaFai Lau 20611e270976SMartin KaFai Lau memcpy(info.tag, prog->tag, sizeof(prog->tag)); 2062cb4d2b3fSMartin KaFai Lau memcpy(info.name, prog->aux->name, sizeof(prog->aux->name)); 2063cb4d2b3fSMartin KaFai Lau 2064cb4d2b3fSMartin KaFai Lau ulen = info.nr_map_ids; 2065cb4d2b3fSMartin KaFai Lau info.nr_map_ids = prog->aux->used_map_cnt; 2066cb4d2b3fSMartin KaFai Lau ulen = min_t(u32, info.nr_map_ids, ulen); 2067cb4d2b3fSMartin KaFai Lau if (ulen) { 2068721e08daSMartin KaFai Lau u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids); 2069cb4d2b3fSMartin KaFai Lau u32 i; 2070cb4d2b3fSMartin KaFai Lau 2071cb4d2b3fSMartin KaFai Lau for (i = 0; i < ulen; i++) 2072cb4d2b3fSMartin KaFai Lau if (put_user(prog->aux->used_maps[i]->id, 2073cb4d2b3fSMartin KaFai Lau &user_map_ids[i])) 2074cb4d2b3fSMartin KaFai Lau return -EFAULT; 2075cb4d2b3fSMartin KaFai Lau } 20761e270976SMartin KaFai Lau 20771e270976SMartin KaFai Lau if (!capable(CAP_SYS_ADMIN)) { 20781e270976SMartin KaFai Lau info.jited_prog_len = 0; 20791e270976SMartin KaFai Lau info.xlated_prog_len = 0; 2080dbecd738SSandipan Das info.nr_jited_ksyms = 0; 20811e270976SMartin KaFai Lau goto done; 20821e270976SMartin KaFai Lau } 20831e270976SMartin KaFai Lau 20841e270976SMartin KaFai Lau ulen = info.xlated_prog_len; 20859975a54bSDaniel Borkmann info.xlated_prog_len = bpf_prog_insn_size(prog); 20861e270976SMartin KaFai Lau if (info.xlated_prog_len && ulen) { 20877105e828SDaniel Borkmann struct bpf_insn *insns_sanitized; 20887105e828SDaniel Borkmann bool fault; 20897105e828SDaniel Borkmann 20907105e828SDaniel Borkmann if (prog->blinded && !bpf_dump_raw_ok()) { 20917105e828SDaniel Borkmann info.xlated_prog_insns = 0; 20927105e828SDaniel Borkmann goto done; 20937105e828SDaniel Borkmann } 20947105e828SDaniel Borkmann insns_sanitized = bpf_insn_prepare_dump(prog); 20957105e828SDaniel Borkmann if (!insns_sanitized) 20967105e828SDaniel Borkmann return -ENOMEM; 20971e270976SMartin KaFai Lau uinsns = u64_to_user_ptr(info.xlated_prog_insns); 20981e270976SMartin KaFai Lau ulen = min_t(u32, info.xlated_prog_len, ulen); 20997105e828SDaniel Borkmann fault = copy_to_user(uinsns, insns_sanitized, ulen); 21007105e828SDaniel Borkmann kfree(insns_sanitized); 21017105e828SDaniel Borkmann if (fault) 21021e270976SMartin KaFai Lau return -EFAULT; 21031e270976SMartin KaFai Lau } 21041e270976SMartin KaFai Lau 2105675fc275SJakub Kicinski if (bpf_prog_is_dev_bound(prog->aux)) { 2106675fc275SJakub Kicinski err = bpf_prog_offload_info_fill(&info, prog); 2107675fc275SJakub Kicinski if (err) 2108675fc275SJakub Kicinski return err; 2109fcfb126dSJiong Wang goto done; 2110fcfb126dSJiong Wang } 2111fcfb126dSJiong Wang 2112fcfb126dSJiong Wang /* NOTE: the following code is supposed to be skipped for offload. 2113fcfb126dSJiong Wang * bpf_prog_offload_info_fill() is the place to fill similar fields 2114fcfb126dSJiong Wang * for offload. 2115fcfb126dSJiong Wang */ 2116fcfb126dSJiong Wang ulen = info.jited_prog_len; 21174d56a76eSSandipan Das if (prog->aux->func_cnt) { 21184d56a76eSSandipan Das u32 i; 21194d56a76eSSandipan Das 21204d56a76eSSandipan Das info.jited_prog_len = 0; 21214d56a76eSSandipan Das for (i = 0; i < prog->aux->func_cnt; i++) 21224d56a76eSSandipan Das info.jited_prog_len += prog->aux->func[i]->jited_len; 21234d56a76eSSandipan Das } else { 2124fcfb126dSJiong Wang info.jited_prog_len = prog->jited_len; 21254d56a76eSSandipan Das } 21264d56a76eSSandipan Das 2127fcfb126dSJiong Wang if (info.jited_prog_len && ulen) { 2128fcfb126dSJiong Wang if (bpf_dump_raw_ok()) { 2129fcfb126dSJiong Wang uinsns = u64_to_user_ptr(info.jited_prog_insns); 2130fcfb126dSJiong Wang ulen = min_t(u32, info.jited_prog_len, ulen); 21314d56a76eSSandipan Das 21324d56a76eSSandipan Das /* for multi-function programs, copy the JITed 21334d56a76eSSandipan Das * instructions for all the functions 21344d56a76eSSandipan Das */ 21354d56a76eSSandipan Das if (prog->aux->func_cnt) { 21364d56a76eSSandipan Das u32 len, free, i; 21374d56a76eSSandipan Das u8 *img; 21384d56a76eSSandipan Das 21394d56a76eSSandipan Das free = ulen; 21404d56a76eSSandipan Das for (i = 0; i < prog->aux->func_cnt; i++) { 21414d56a76eSSandipan Das len = prog->aux->func[i]->jited_len; 21424d56a76eSSandipan Das len = min_t(u32, len, free); 21434d56a76eSSandipan Das img = (u8 *) prog->aux->func[i]->bpf_func; 21444d56a76eSSandipan Das if (copy_to_user(uinsns, img, len)) 21454d56a76eSSandipan Das return -EFAULT; 21464d56a76eSSandipan Das uinsns += len; 21474d56a76eSSandipan Das free -= len; 21484d56a76eSSandipan Das if (!free) 21494d56a76eSSandipan Das break; 21504d56a76eSSandipan Das } 21514d56a76eSSandipan Das } else { 2152fcfb126dSJiong Wang if (copy_to_user(uinsns, prog->bpf_func, ulen)) 2153fcfb126dSJiong Wang return -EFAULT; 21544d56a76eSSandipan Das } 2155fcfb126dSJiong Wang } else { 2156fcfb126dSJiong Wang info.jited_prog_insns = 0; 2157fcfb126dSJiong Wang } 2158675fc275SJakub Kicinski } 2159675fc275SJakub Kicinski 2160dbecd738SSandipan Das ulen = info.nr_jited_ksyms; 2161dbecd738SSandipan Das info.nr_jited_ksyms = prog->aux->func_cnt; 2162dbecd738SSandipan Das if (info.nr_jited_ksyms && ulen) { 2163dbecd738SSandipan Das if (bpf_dump_raw_ok()) { 2164dbecd738SSandipan Das u64 __user *user_ksyms; 2165dbecd738SSandipan Das ulong ksym_addr; 2166dbecd738SSandipan Das u32 i; 2167dbecd738SSandipan Das 2168dbecd738SSandipan Das /* copy the address of the kernel symbol 2169dbecd738SSandipan Das * corresponding to each function 2170dbecd738SSandipan Das */ 2171dbecd738SSandipan Das ulen = min_t(u32, info.nr_jited_ksyms, ulen); 2172dbecd738SSandipan Das user_ksyms = u64_to_user_ptr(info.jited_ksyms); 2173dbecd738SSandipan Das for (i = 0; i < ulen; i++) { 2174dbecd738SSandipan Das ksym_addr = (ulong) prog->aux->func[i]->bpf_func; 2175dbecd738SSandipan Das ksym_addr &= PAGE_MASK; 2176dbecd738SSandipan Das if (put_user((u64) ksym_addr, &user_ksyms[i])) 2177dbecd738SSandipan Das return -EFAULT; 2178dbecd738SSandipan Das } 2179dbecd738SSandipan Das } else { 2180dbecd738SSandipan Das info.jited_ksyms = 0; 2181dbecd738SSandipan Das } 2182dbecd738SSandipan Das } 2183dbecd738SSandipan Das 2184815581c1SSandipan Das ulen = info.nr_jited_func_lens; 2185815581c1SSandipan Das info.nr_jited_func_lens = prog->aux->func_cnt; 2186815581c1SSandipan Das if (info.nr_jited_func_lens && ulen) { 2187815581c1SSandipan Das if (bpf_dump_raw_ok()) { 2188815581c1SSandipan Das u32 __user *user_lens; 2189815581c1SSandipan Das u32 func_len, i; 2190815581c1SSandipan Das 2191815581c1SSandipan Das /* copy the JITed image lengths for each function */ 2192815581c1SSandipan Das ulen = min_t(u32, info.nr_jited_func_lens, ulen); 2193815581c1SSandipan Das user_lens = u64_to_user_ptr(info.jited_func_lens); 2194815581c1SSandipan Das for (i = 0; i < ulen; i++) { 2195815581c1SSandipan Das func_len = prog->aux->func[i]->jited_len; 2196815581c1SSandipan Das if (put_user(func_len, &user_lens[i])) 2197815581c1SSandipan Das return -EFAULT; 2198815581c1SSandipan Das } 2199815581c1SSandipan Das } else { 2200815581c1SSandipan Das info.jited_func_lens = 0; 2201815581c1SSandipan Das } 2202815581c1SSandipan Das } 2203815581c1SSandipan Das 22041e270976SMartin KaFai Lau done: 22051e270976SMartin KaFai Lau if (copy_to_user(uinfo, &info, info_len) || 22061e270976SMartin KaFai Lau put_user(info_len, &uattr->info.info_len)) 22071e270976SMartin KaFai Lau return -EFAULT; 22081e270976SMartin KaFai Lau 22091e270976SMartin KaFai Lau return 0; 22101e270976SMartin KaFai Lau } 22111e270976SMartin KaFai Lau 22121e270976SMartin KaFai Lau static int bpf_map_get_info_by_fd(struct bpf_map *map, 22131e270976SMartin KaFai Lau const union bpf_attr *attr, 22141e270976SMartin KaFai Lau union bpf_attr __user *uattr) 22151e270976SMartin KaFai Lau { 22161e270976SMartin KaFai Lau struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info); 22171e270976SMartin KaFai Lau struct bpf_map_info info = {}; 22181e270976SMartin KaFai Lau u32 info_len = attr->info.info_len; 22191e270976SMartin KaFai Lau int err; 22201e270976SMartin KaFai Lau 2221dcab51f1SMartin KaFai Lau err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len); 22221e270976SMartin KaFai Lau if (err) 22231e270976SMartin KaFai Lau return err; 22241e270976SMartin KaFai Lau info_len = min_t(u32, sizeof(info), info_len); 22251e270976SMartin KaFai Lau 22261e270976SMartin KaFai Lau info.type = map->map_type; 22271e270976SMartin KaFai Lau info.id = map->id; 22281e270976SMartin KaFai Lau info.key_size = map->key_size; 22291e270976SMartin KaFai Lau info.value_size = map->value_size; 22301e270976SMartin KaFai Lau info.max_entries = map->max_entries; 22311e270976SMartin KaFai Lau info.map_flags = map->map_flags; 2232ad5b177bSMartin KaFai Lau memcpy(info.name, map->name, sizeof(map->name)); 22331e270976SMartin KaFai Lau 223478958fcaSMartin KaFai Lau if (map->btf) { 223578958fcaSMartin KaFai Lau info.btf_id = btf_id(map->btf); 22369b2cf328SMartin KaFai Lau info.btf_key_type_id = map->btf_key_type_id; 22379b2cf328SMartin KaFai Lau info.btf_value_type_id = map->btf_value_type_id; 223878958fcaSMartin KaFai Lau } 223978958fcaSMartin KaFai Lau 224052775b33SJakub Kicinski if (bpf_map_is_dev_bound(map)) { 224152775b33SJakub Kicinski err = bpf_map_offload_info_fill(&info, map); 224252775b33SJakub Kicinski if (err) 224352775b33SJakub Kicinski return err; 224452775b33SJakub Kicinski } 224552775b33SJakub Kicinski 22461e270976SMartin KaFai Lau if (copy_to_user(uinfo, &info, info_len) || 22471e270976SMartin KaFai Lau put_user(info_len, &uattr->info.info_len)) 22481e270976SMartin KaFai Lau return -EFAULT; 22491e270976SMartin KaFai Lau 22501e270976SMartin KaFai Lau return 0; 22511e270976SMartin KaFai Lau } 22521e270976SMartin KaFai Lau 225362dab84cSMartin KaFai Lau static int bpf_btf_get_info_by_fd(struct btf *btf, 225462dab84cSMartin KaFai Lau const union bpf_attr *attr, 225562dab84cSMartin KaFai Lau union bpf_attr __user *uattr) 225662dab84cSMartin KaFai Lau { 225762dab84cSMartin KaFai Lau struct bpf_btf_info __user *uinfo = u64_to_user_ptr(attr->info.info); 225862dab84cSMartin KaFai Lau u32 info_len = attr->info.info_len; 225962dab84cSMartin KaFai Lau int err; 226062dab84cSMartin KaFai Lau 2261dcab51f1SMartin KaFai Lau err = bpf_check_uarg_tail_zero(uinfo, sizeof(*uinfo), info_len); 226262dab84cSMartin KaFai Lau if (err) 226362dab84cSMartin KaFai Lau return err; 226462dab84cSMartin KaFai Lau 226562dab84cSMartin KaFai Lau return btf_get_info_by_fd(btf, attr, uattr); 226662dab84cSMartin KaFai Lau } 226762dab84cSMartin KaFai Lau 22681e270976SMartin KaFai Lau #define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info 22691e270976SMartin KaFai Lau 22701e270976SMartin KaFai Lau static int bpf_obj_get_info_by_fd(const union bpf_attr *attr, 22711e270976SMartin KaFai Lau union bpf_attr __user *uattr) 22721e270976SMartin KaFai Lau { 22731e270976SMartin KaFai Lau int ufd = attr->info.bpf_fd; 22741e270976SMartin KaFai Lau struct fd f; 22751e270976SMartin KaFai Lau int err; 22761e270976SMartin KaFai Lau 22771e270976SMartin KaFai Lau if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD)) 22781e270976SMartin KaFai Lau return -EINVAL; 22791e270976SMartin KaFai Lau 22801e270976SMartin KaFai Lau f = fdget(ufd); 22811e270976SMartin KaFai Lau if (!f.file) 22821e270976SMartin KaFai Lau return -EBADFD; 22831e270976SMartin KaFai Lau 22841e270976SMartin KaFai Lau if (f.file->f_op == &bpf_prog_fops) 22851e270976SMartin KaFai Lau err = bpf_prog_get_info_by_fd(f.file->private_data, attr, 22861e270976SMartin KaFai Lau uattr); 22871e270976SMartin KaFai Lau else if (f.file->f_op == &bpf_map_fops) 22881e270976SMartin KaFai Lau err = bpf_map_get_info_by_fd(f.file->private_data, attr, 22891e270976SMartin KaFai Lau uattr); 229060197cfbSMartin KaFai Lau else if (f.file->f_op == &btf_fops) 229162dab84cSMartin KaFai Lau err = bpf_btf_get_info_by_fd(f.file->private_data, attr, uattr); 22921e270976SMartin KaFai Lau else 22931e270976SMartin KaFai Lau err = -EINVAL; 22941e270976SMartin KaFai Lau 22951e270976SMartin KaFai Lau fdput(f); 22961e270976SMartin KaFai Lau return err; 22971e270976SMartin KaFai Lau } 22981e270976SMartin KaFai Lau 2299f56a653cSMartin KaFai Lau #define BPF_BTF_LOAD_LAST_FIELD btf_log_level 2300f56a653cSMartin KaFai Lau 2301f56a653cSMartin KaFai Lau static int bpf_btf_load(const union bpf_attr *attr) 2302f56a653cSMartin KaFai Lau { 2303f56a653cSMartin KaFai Lau if (CHECK_ATTR(BPF_BTF_LOAD)) 2304f56a653cSMartin KaFai Lau return -EINVAL; 2305f56a653cSMartin KaFai Lau 2306f56a653cSMartin KaFai Lau if (!capable(CAP_SYS_ADMIN)) 2307f56a653cSMartin KaFai Lau return -EPERM; 2308f56a653cSMartin KaFai Lau 2309f56a653cSMartin KaFai Lau return btf_new_fd(attr); 2310f56a653cSMartin KaFai Lau } 2311f56a653cSMartin KaFai Lau 231278958fcaSMartin KaFai Lau #define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id 231378958fcaSMartin KaFai Lau 231478958fcaSMartin KaFai Lau static int bpf_btf_get_fd_by_id(const union bpf_attr *attr) 231578958fcaSMartin KaFai Lau { 231678958fcaSMartin KaFai Lau if (CHECK_ATTR(BPF_BTF_GET_FD_BY_ID)) 231778958fcaSMartin KaFai Lau return -EINVAL; 231878958fcaSMartin KaFai Lau 231978958fcaSMartin KaFai Lau if (!capable(CAP_SYS_ADMIN)) 232078958fcaSMartin KaFai Lau return -EPERM; 232178958fcaSMartin KaFai Lau 232278958fcaSMartin KaFai Lau return btf_get_fd_by_id(attr->btf_id); 232378958fcaSMartin KaFai Lau } 232478958fcaSMartin KaFai Lau 232541bdc4b4SYonghong Song static int bpf_task_fd_query_copy(const union bpf_attr *attr, 232641bdc4b4SYonghong Song union bpf_attr __user *uattr, 232741bdc4b4SYonghong Song u32 prog_id, u32 fd_type, 232841bdc4b4SYonghong Song const char *buf, u64 probe_offset, 232941bdc4b4SYonghong Song u64 probe_addr) 233041bdc4b4SYonghong Song { 233141bdc4b4SYonghong Song char __user *ubuf = u64_to_user_ptr(attr->task_fd_query.buf); 233241bdc4b4SYonghong Song u32 len = buf ? strlen(buf) : 0, input_len; 233341bdc4b4SYonghong Song int err = 0; 233441bdc4b4SYonghong Song 233541bdc4b4SYonghong Song if (put_user(len, &uattr->task_fd_query.buf_len)) 233641bdc4b4SYonghong Song return -EFAULT; 233741bdc4b4SYonghong Song input_len = attr->task_fd_query.buf_len; 233841bdc4b4SYonghong Song if (input_len && ubuf) { 233941bdc4b4SYonghong Song if (!len) { 234041bdc4b4SYonghong Song /* nothing to copy, just make ubuf NULL terminated */ 234141bdc4b4SYonghong Song char zero = '\0'; 234241bdc4b4SYonghong Song 234341bdc4b4SYonghong Song if (put_user(zero, ubuf)) 234441bdc4b4SYonghong Song return -EFAULT; 234541bdc4b4SYonghong Song } else if (input_len >= len + 1) { 234641bdc4b4SYonghong Song /* ubuf can hold the string with NULL terminator */ 234741bdc4b4SYonghong Song if (copy_to_user(ubuf, buf, len + 1)) 234841bdc4b4SYonghong Song return -EFAULT; 234941bdc4b4SYonghong Song } else { 235041bdc4b4SYonghong Song /* ubuf cannot hold the string with NULL terminator, 235141bdc4b4SYonghong Song * do a partial copy with NULL terminator. 235241bdc4b4SYonghong Song */ 235341bdc4b4SYonghong Song char zero = '\0'; 235441bdc4b4SYonghong Song 235541bdc4b4SYonghong Song err = -ENOSPC; 235641bdc4b4SYonghong Song if (copy_to_user(ubuf, buf, input_len - 1)) 235741bdc4b4SYonghong Song return -EFAULT; 235841bdc4b4SYonghong Song if (put_user(zero, ubuf + input_len - 1)) 235941bdc4b4SYonghong Song return -EFAULT; 236041bdc4b4SYonghong Song } 236141bdc4b4SYonghong Song } 236241bdc4b4SYonghong Song 236341bdc4b4SYonghong Song if (put_user(prog_id, &uattr->task_fd_query.prog_id) || 236441bdc4b4SYonghong Song put_user(fd_type, &uattr->task_fd_query.fd_type) || 236541bdc4b4SYonghong Song put_user(probe_offset, &uattr->task_fd_query.probe_offset) || 236641bdc4b4SYonghong Song put_user(probe_addr, &uattr->task_fd_query.probe_addr)) 236741bdc4b4SYonghong Song return -EFAULT; 236841bdc4b4SYonghong Song 236941bdc4b4SYonghong Song return err; 237041bdc4b4SYonghong Song } 237141bdc4b4SYonghong Song 237241bdc4b4SYonghong Song #define BPF_TASK_FD_QUERY_LAST_FIELD task_fd_query.probe_addr 237341bdc4b4SYonghong Song 237441bdc4b4SYonghong Song static int bpf_task_fd_query(const union bpf_attr *attr, 237541bdc4b4SYonghong Song union bpf_attr __user *uattr) 237641bdc4b4SYonghong Song { 237741bdc4b4SYonghong Song pid_t pid = attr->task_fd_query.pid; 237841bdc4b4SYonghong Song u32 fd = attr->task_fd_query.fd; 237941bdc4b4SYonghong Song const struct perf_event *event; 238041bdc4b4SYonghong Song struct files_struct *files; 238141bdc4b4SYonghong Song struct task_struct *task; 238241bdc4b4SYonghong Song struct file *file; 238341bdc4b4SYonghong Song int err; 238441bdc4b4SYonghong Song 238541bdc4b4SYonghong Song if (CHECK_ATTR(BPF_TASK_FD_QUERY)) 238641bdc4b4SYonghong Song return -EINVAL; 238741bdc4b4SYonghong Song 238841bdc4b4SYonghong Song if (!capable(CAP_SYS_ADMIN)) 238941bdc4b4SYonghong Song return -EPERM; 239041bdc4b4SYonghong Song 239141bdc4b4SYonghong Song if (attr->task_fd_query.flags != 0) 239241bdc4b4SYonghong Song return -EINVAL; 239341bdc4b4SYonghong Song 239441bdc4b4SYonghong Song task = get_pid_task(find_vpid(pid), PIDTYPE_PID); 239541bdc4b4SYonghong Song if (!task) 239641bdc4b4SYonghong Song return -ENOENT; 239741bdc4b4SYonghong Song 239841bdc4b4SYonghong Song files = get_files_struct(task); 239941bdc4b4SYonghong Song put_task_struct(task); 240041bdc4b4SYonghong Song if (!files) 240141bdc4b4SYonghong Song return -ENOENT; 240241bdc4b4SYonghong Song 240341bdc4b4SYonghong Song err = 0; 240441bdc4b4SYonghong Song spin_lock(&files->file_lock); 240541bdc4b4SYonghong Song file = fcheck_files(files, fd); 240641bdc4b4SYonghong Song if (!file) 240741bdc4b4SYonghong Song err = -EBADF; 240841bdc4b4SYonghong Song else 240941bdc4b4SYonghong Song get_file(file); 241041bdc4b4SYonghong Song spin_unlock(&files->file_lock); 241141bdc4b4SYonghong Song put_files_struct(files); 241241bdc4b4SYonghong Song 241341bdc4b4SYonghong Song if (err) 241441bdc4b4SYonghong Song goto out; 241541bdc4b4SYonghong Song 241641bdc4b4SYonghong Song if (file->f_op == &bpf_raw_tp_fops) { 241741bdc4b4SYonghong Song struct bpf_raw_tracepoint *raw_tp = file->private_data; 241841bdc4b4SYonghong Song struct bpf_raw_event_map *btp = raw_tp->btp; 241941bdc4b4SYonghong Song 242041bdc4b4SYonghong Song err = bpf_task_fd_query_copy(attr, uattr, 242141bdc4b4SYonghong Song raw_tp->prog->aux->id, 242241bdc4b4SYonghong Song BPF_FD_TYPE_RAW_TRACEPOINT, 242341bdc4b4SYonghong Song btp->tp->name, 0, 0); 242441bdc4b4SYonghong Song goto put_file; 242541bdc4b4SYonghong Song } 242641bdc4b4SYonghong Song 242741bdc4b4SYonghong Song event = perf_get_event(file); 242841bdc4b4SYonghong Song if (!IS_ERR(event)) { 242941bdc4b4SYonghong Song u64 probe_offset, probe_addr; 243041bdc4b4SYonghong Song u32 prog_id, fd_type; 243141bdc4b4SYonghong Song const char *buf; 243241bdc4b4SYonghong Song 243341bdc4b4SYonghong Song err = bpf_get_perf_event_info(event, &prog_id, &fd_type, 243441bdc4b4SYonghong Song &buf, &probe_offset, 243541bdc4b4SYonghong Song &probe_addr); 243641bdc4b4SYonghong Song if (!err) 243741bdc4b4SYonghong Song err = bpf_task_fd_query_copy(attr, uattr, prog_id, 243841bdc4b4SYonghong Song fd_type, buf, 243941bdc4b4SYonghong Song probe_offset, 244041bdc4b4SYonghong Song probe_addr); 244141bdc4b4SYonghong Song goto put_file; 244241bdc4b4SYonghong Song } 244341bdc4b4SYonghong Song 244441bdc4b4SYonghong Song err = -ENOTSUPP; 244541bdc4b4SYonghong Song put_file: 244641bdc4b4SYonghong Song fput(file); 244741bdc4b4SYonghong Song out: 244841bdc4b4SYonghong Song return err; 244941bdc4b4SYonghong Song } 245041bdc4b4SYonghong Song 245199c55f7dSAlexei Starovoitov SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size) 245299c55f7dSAlexei Starovoitov { 245399c55f7dSAlexei Starovoitov union bpf_attr attr = {}; 245499c55f7dSAlexei Starovoitov int err; 245599c55f7dSAlexei Starovoitov 24560fa4fe85SChenbo Feng if (sysctl_unprivileged_bpf_disabled && !capable(CAP_SYS_ADMIN)) 245799c55f7dSAlexei Starovoitov return -EPERM; 245899c55f7dSAlexei Starovoitov 2459dcab51f1SMartin KaFai Lau err = bpf_check_uarg_tail_zero(uattr, sizeof(attr), size); 246099c55f7dSAlexei Starovoitov if (err) 246199c55f7dSAlexei Starovoitov return err; 24621e270976SMartin KaFai Lau size = min_t(u32, size, sizeof(attr)); 246399c55f7dSAlexei Starovoitov 246499c55f7dSAlexei Starovoitov /* copy attributes from user space, may be less than sizeof(bpf_attr) */ 246599c55f7dSAlexei Starovoitov if (copy_from_user(&attr, uattr, size) != 0) 246699c55f7dSAlexei Starovoitov return -EFAULT; 246799c55f7dSAlexei Starovoitov 2468afdb09c7SChenbo Feng err = security_bpf(cmd, &attr, size); 2469afdb09c7SChenbo Feng if (err < 0) 2470afdb09c7SChenbo Feng return err; 2471afdb09c7SChenbo Feng 247299c55f7dSAlexei Starovoitov switch (cmd) { 247399c55f7dSAlexei Starovoitov case BPF_MAP_CREATE: 247499c55f7dSAlexei Starovoitov err = map_create(&attr); 247599c55f7dSAlexei Starovoitov break; 2476db20fd2bSAlexei Starovoitov case BPF_MAP_LOOKUP_ELEM: 2477db20fd2bSAlexei Starovoitov err = map_lookup_elem(&attr); 2478db20fd2bSAlexei Starovoitov break; 2479db20fd2bSAlexei Starovoitov case BPF_MAP_UPDATE_ELEM: 2480db20fd2bSAlexei Starovoitov err = map_update_elem(&attr); 2481db20fd2bSAlexei Starovoitov break; 2482db20fd2bSAlexei Starovoitov case BPF_MAP_DELETE_ELEM: 2483db20fd2bSAlexei Starovoitov err = map_delete_elem(&attr); 2484db20fd2bSAlexei Starovoitov break; 2485db20fd2bSAlexei Starovoitov case BPF_MAP_GET_NEXT_KEY: 2486db20fd2bSAlexei Starovoitov err = map_get_next_key(&attr); 2487db20fd2bSAlexei Starovoitov break; 248809756af4SAlexei Starovoitov case BPF_PROG_LOAD: 248909756af4SAlexei Starovoitov err = bpf_prog_load(&attr); 249009756af4SAlexei Starovoitov break; 2491b2197755SDaniel Borkmann case BPF_OBJ_PIN: 2492b2197755SDaniel Borkmann err = bpf_obj_pin(&attr); 2493b2197755SDaniel Borkmann break; 2494b2197755SDaniel Borkmann case BPF_OBJ_GET: 2495b2197755SDaniel Borkmann err = bpf_obj_get(&attr); 2496b2197755SDaniel Borkmann break; 2497f4324551SDaniel Mack case BPF_PROG_ATTACH: 2498f4324551SDaniel Mack err = bpf_prog_attach(&attr); 2499f4324551SDaniel Mack break; 2500f4324551SDaniel Mack case BPF_PROG_DETACH: 2501f4324551SDaniel Mack err = bpf_prog_detach(&attr); 2502f4324551SDaniel Mack break; 2503468e2f64SAlexei Starovoitov case BPF_PROG_QUERY: 2504468e2f64SAlexei Starovoitov err = bpf_prog_query(&attr, uattr); 2505468e2f64SAlexei Starovoitov break; 25061cf1cae9SAlexei Starovoitov case BPF_PROG_TEST_RUN: 25071cf1cae9SAlexei Starovoitov err = bpf_prog_test_run(&attr, uattr); 25081cf1cae9SAlexei Starovoitov break; 250934ad5580SMartin KaFai Lau case BPF_PROG_GET_NEXT_ID: 251034ad5580SMartin KaFai Lau err = bpf_obj_get_next_id(&attr, uattr, 251134ad5580SMartin KaFai Lau &prog_idr, &prog_idr_lock); 251234ad5580SMartin KaFai Lau break; 251334ad5580SMartin KaFai Lau case BPF_MAP_GET_NEXT_ID: 251434ad5580SMartin KaFai Lau err = bpf_obj_get_next_id(&attr, uattr, 251534ad5580SMartin KaFai Lau &map_idr, &map_idr_lock); 251634ad5580SMartin KaFai Lau break; 2517b16d9aa4SMartin KaFai Lau case BPF_PROG_GET_FD_BY_ID: 2518b16d9aa4SMartin KaFai Lau err = bpf_prog_get_fd_by_id(&attr); 2519b16d9aa4SMartin KaFai Lau break; 2520bd5f5f4eSMartin KaFai Lau case BPF_MAP_GET_FD_BY_ID: 2521bd5f5f4eSMartin KaFai Lau err = bpf_map_get_fd_by_id(&attr); 2522bd5f5f4eSMartin KaFai Lau break; 25231e270976SMartin KaFai Lau case BPF_OBJ_GET_INFO_BY_FD: 25241e270976SMartin KaFai Lau err = bpf_obj_get_info_by_fd(&attr, uattr); 25251e270976SMartin KaFai Lau break; 2526c4f6699dSAlexei Starovoitov case BPF_RAW_TRACEPOINT_OPEN: 2527c4f6699dSAlexei Starovoitov err = bpf_raw_tracepoint_open(&attr); 2528c4f6699dSAlexei Starovoitov break; 2529f56a653cSMartin KaFai Lau case BPF_BTF_LOAD: 2530f56a653cSMartin KaFai Lau err = bpf_btf_load(&attr); 2531f56a653cSMartin KaFai Lau break; 253278958fcaSMartin KaFai Lau case BPF_BTF_GET_FD_BY_ID: 253378958fcaSMartin KaFai Lau err = bpf_btf_get_fd_by_id(&attr); 253478958fcaSMartin KaFai Lau break; 253541bdc4b4SYonghong Song case BPF_TASK_FD_QUERY: 253641bdc4b4SYonghong Song err = bpf_task_fd_query(&attr, uattr); 253741bdc4b4SYonghong Song break; 2538bd513cd0SMauricio Vasquez B case BPF_MAP_LOOKUP_AND_DELETE_ELEM: 2539bd513cd0SMauricio Vasquez B err = map_lookup_and_delete_elem(&attr); 2540bd513cd0SMauricio Vasquez B break; 254199c55f7dSAlexei Starovoitov default: 254299c55f7dSAlexei Starovoitov err = -EINVAL; 254399c55f7dSAlexei Starovoitov break; 254499c55f7dSAlexei Starovoitov } 254599c55f7dSAlexei Starovoitov 254699c55f7dSAlexei Starovoitov return err; 254799c55f7dSAlexei Starovoitov } 2548