1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2008, Intel Corporation. 4 * 5 * Author: Alexander Duyck <alexander.h.duyck@intel.com> 6 */ 7 8 #include <linux/module.h> 9 #include <linux/init.h> 10 #include <linux/kernel.h> 11 #include <linux/skbuff.h> 12 #include <linux/rtnetlink.h> 13 #include <net/netlink.h> 14 #include <net/pkt_sched.h> 15 #include <net/ip.h> 16 #include <net/ipv6.h> 17 #include <net/dsfield.h> 18 #include <net/pkt_cls.h> 19 #include <net/tc_wrapper.h> 20 21 #include <linux/tc_act/tc_skbedit.h> 22 #include <net/tc_act/tc_skbedit.h> 23 24 static struct tc_action_ops act_skbedit_ops; 25 26 static u16 tcf_skbedit_hash(struct tcf_skbedit_params *params, 27 struct sk_buff *skb) 28 { 29 u16 queue_mapping = params->queue_mapping; 30 31 if (params->flags & SKBEDIT_F_TXQ_SKBHASH) { 32 u32 hash = skb_get_hash(skb); 33 34 queue_mapping += hash % params->mapping_mod; 35 } 36 37 return netdev_cap_txqueue(skb->dev, queue_mapping); 38 } 39 40 TC_INDIRECT_SCOPE int tcf_skbedit_act(struct sk_buff *skb, 41 const struct tc_action *a, 42 struct tcf_result *res) 43 { 44 struct tcf_skbedit *d = to_skbedit(a); 45 struct tcf_skbedit_params *params; 46 47 tcf_lastuse_update(&d->tcf_tm); 48 bstats_update(this_cpu_ptr(d->common.cpu_bstats), skb); 49 50 params = rcu_dereference_bh(d->params); 51 52 if (params->flags & SKBEDIT_F_PRIORITY) 53 skb->priority = params->priority; 54 if (params->flags & SKBEDIT_F_INHERITDSFIELD) { 55 int wlen = skb_network_offset(skb); 56 57 switch (skb_protocol(skb, true)) { 58 case htons(ETH_P_IP): 59 wlen += sizeof(struct iphdr); 60 if (!pskb_may_pull(skb, wlen)) 61 goto err; 62 skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2; 63 break; 64 65 case htons(ETH_P_IPV6): 66 wlen += sizeof(struct ipv6hdr); 67 if (!pskb_may_pull(skb, wlen)) 68 goto err; 69 skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2; 70 break; 71 } 72 } 73 if (params->flags & SKBEDIT_F_QUEUE_MAPPING && 74 skb->dev->real_num_tx_queues > params->queue_mapping) { 75 if (skb_at_tc_egress(skb)) 76 netdev_xmit_skip_txqueue(true); 77 skb_set_queue_mapping(skb, tcf_skbedit_hash(params, skb)); 78 } 79 if (params->flags & SKBEDIT_F_MARK) { 80 skb->mark &= ~params->mask; 81 skb->mark |= params->mark & params->mask; 82 } 83 if (params->flags & SKBEDIT_F_PTYPE) 84 skb->pkt_type = params->ptype; 85 return params->action; 86 87 err: 88 qstats_cpu_drop_inc(d->common.cpu_qstats); 89 return TC_ACT_SHOT; 90 } 91 92 static void tcf_skbedit_stats_update(struct tc_action *a, u64 bytes, 93 u64 packets, u64 drops, 94 u64 lastuse, bool hw) 95 { 96 struct tcf_skbedit *d = to_skbedit(a); 97 struct tcf_t *tm = &d->tcf_tm; 98 99 tcf_action_update_stats(a, bytes, packets, drops, hw); 100 tm->lastuse = max_t(u64, tm->lastuse, lastuse); 101 } 102 103 static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = { 104 [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) }, 105 [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) }, 106 [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) }, 107 [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) }, 108 [TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) }, 109 [TCA_SKBEDIT_MASK] = { .len = sizeof(u32) }, 110 [TCA_SKBEDIT_FLAGS] = { .len = sizeof(u64) }, 111 [TCA_SKBEDIT_QUEUE_MAPPING_MAX] = { .len = sizeof(u16) }, 112 }; 113 114 static int tcf_skbedit_init(struct net *net, struct nlattr *nla, 115 struct nlattr *est, struct tc_action **a, 116 struct tcf_proto *tp, u32 act_flags, 117 struct netlink_ext_ack *extack) 118 { 119 struct tc_action_net *tn = net_generic(net, act_skbedit_ops.net_id); 120 bool bind = act_flags & TCA_ACT_FLAGS_BIND; 121 struct tcf_skbedit_params *params_new; 122 struct nlattr *tb[TCA_SKBEDIT_MAX + 1]; 123 struct tcf_chain *goto_ch = NULL; 124 struct tc_skbedit *parm; 125 struct tcf_skbedit *d; 126 u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL; 127 u16 *queue_mapping = NULL, *ptype = NULL; 128 u32 mapping_mod = 1; 129 bool exists = false; 130 int ret = 0, err; 131 u32 index; 132 133 if (nla == NULL) 134 return -EINVAL; 135 136 err = nla_parse_nested_deprecated(tb, TCA_SKBEDIT_MAX, nla, 137 skbedit_policy, NULL); 138 if (err < 0) 139 return err; 140 141 if (tb[TCA_SKBEDIT_PARMS] == NULL) 142 return -EINVAL; 143 144 if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { 145 flags |= SKBEDIT_F_PRIORITY; 146 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); 147 } 148 149 if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { 150 if (is_tcf_skbedit_ingress(act_flags) && 151 !(act_flags & TCA_ACT_FLAGS_SKIP_SW)) { 152 NL_SET_ERR_MSG_MOD(extack, "\"queue_mapping\" option on receive side is hardware only, use skip_sw"); 153 return -EOPNOTSUPP; 154 } 155 flags |= SKBEDIT_F_QUEUE_MAPPING; 156 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); 157 } 158 159 if (tb[TCA_SKBEDIT_PTYPE] != NULL) { 160 ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]); 161 if (!skb_pkt_type_ok(*ptype)) 162 return -EINVAL; 163 flags |= SKBEDIT_F_PTYPE; 164 } 165 166 if (tb[TCA_SKBEDIT_MARK] != NULL) { 167 flags |= SKBEDIT_F_MARK; 168 mark = nla_data(tb[TCA_SKBEDIT_MARK]); 169 } 170 171 if (tb[TCA_SKBEDIT_MASK] != NULL) { 172 flags |= SKBEDIT_F_MASK; 173 mask = nla_data(tb[TCA_SKBEDIT_MASK]); 174 } 175 176 if (tb[TCA_SKBEDIT_FLAGS] != NULL) { 177 u64 *pure_flags = nla_data(tb[TCA_SKBEDIT_FLAGS]); 178 179 if (*pure_flags & SKBEDIT_F_TXQ_SKBHASH) { 180 u16 *queue_mapping_max; 181 182 if (!tb[TCA_SKBEDIT_QUEUE_MAPPING] || 183 !tb[TCA_SKBEDIT_QUEUE_MAPPING_MAX]) { 184 NL_SET_ERR_MSG_MOD(extack, "Missing required range of queue_mapping."); 185 return -EINVAL; 186 } 187 188 queue_mapping_max = 189 nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING_MAX]); 190 if (*queue_mapping_max < *queue_mapping) { 191 NL_SET_ERR_MSG_MOD(extack, "The range of queue_mapping is invalid, max < min."); 192 return -EINVAL; 193 } 194 195 mapping_mod = *queue_mapping_max - *queue_mapping + 1; 196 if (mapping_mod > U16_MAX) { 197 NL_SET_ERR_MSG_MOD(extack, "The range of queue_mapping is invalid."); 198 return -EINVAL; 199 } 200 flags |= SKBEDIT_F_TXQ_SKBHASH; 201 } 202 if (*pure_flags & SKBEDIT_F_INHERITDSFIELD) 203 flags |= SKBEDIT_F_INHERITDSFIELD; 204 } 205 206 parm = nla_data(tb[TCA_SKBEDIT_PARMS]); 207 index = parm->index; 208 err = tcf_idr_check_alloc(tn, &index, a, bind); 209 if (err < 0) 210 return err; 211 exists = err; 212 if (exists && bind) 213 return ACT_P_BOUND; 214 215 if (!flags) { 216 if (exists) 217 tcf_idr_release(*a, bind); 218 else 219 tcf_idr_cleanup(tn, index); 220 return -EINVAL; 221 } 222 223 if (!exists) { 224 ret = tcf_idr_create(tn, index, est, a, 225 &act_skbedit_ops, bind, true, act_flags); 226 if (ret) { 227 tcf_idr_cleanup(tn, index); 228 return ret; 229 } 230 231 d = to_skbedit(*a); 232 ret = ACT_P_CREATED; 233 } else { 234 d = to_skbedit(*a); 235 if (!(act_flags & TCA_ACT_FLAGS_REPLACE)) { 236 tcf_idr_release(*a, bind); 237 return -EEXIST; 238 } 239 } 240 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); 241 if (err < 0) 242 goto release_idr; 243 244 params_new = kzalloc_obj(*params_new); 245 if (unlikely(!params_new)) { 246 err = -ENOMEM; 247 goto put_chain; 248 } 249 250 params_new->flags = flags; 251 if (flags & SKBEDIT_F_PRIORITY) 252 params_new->priority = *priority; 253 if (flags & SKBEDIT_F_QUEUE_MAPPING) { 254 params_new->queue_mapping = *queue_mapping; 255 params_new->mapping_mod = mapping_mod; 256 } 257 if (flags & SKBEDIT_F_MARK) 258 params_new->mark = *mark; 259 if (flags & SKBEDIT_F_PTYPE) 260 params_new->ptype = *ptype; 261 /* default behaviour is to use all the bits */ 262 params_new->mask = 0xffffffff; 263 if (flags & SKBEDIT_F_MASK) 264 params_new->mask = *mask; 265 266 params_new->action = parm->action; 267 spin_lock_bh(&d->tcf_lock); 268 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); 269 params_new = rcu_replace_pointer(d->params, params_new, 270 lockdep_is_held(&d->tcf_lock)); 271 spin_unlock_bh(&d->tcf_lock); 272 if (params_new) 273 kfree_rcu(params_new, rcu); 274 if (goto_ch) 275 tcf_chain_put_by_act(goto_ch); 276 277 return ret; 278 put_chain: 279 if (goto_ch) 280 tcf_chain_put_by_act(goto_ch); 281 release_idr: 282 tcf_idr_release(*a, bind); 283 return err; 284 } 285 286 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, 287 int bind, int ref) 288 { 289 const struct tcf_skbedit *d = to_skbedit(a); 290 unsigned char *b = skb_tail_pointer(skb); 291 const struct tcf_skbedit_params *params; 292 struct tc_skbedit opt = { 293 .index = d->tcf_index, 294 .refcnt = refcount_read(&d->tcf_refcnt) - ref, 295 .bindcnt = atomic_read(&d->tcf_bindcnt) - bind, 296 }; 297 u64 pure_flags = 0; 298 struct tcf_t t; 299 300 rcu_read_lock(); 301 params = rcu_dereference(d->params); 302 opt.action = params->action; 303 304 if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt)) 305 goto nla_put_failure; 306 if ((params->flags & SKBEDIT_F_PRIORITY) && 307 nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, params->priority)) 308 goto nla_put_failure; 309 if ((params->flags & SKBEDIT_F_QUEUE_MAPPING) && 310 nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, params->queue_mapping)) 311 goto nla_put_failure; 312 if ((params->flags & SKBEDIT_F_MARK) && 313 nla_put_u32(skb, TCA_SKBEDIT_MARK, params->mark)) 314 goto nla_put_failure; 315 if ((params->flags & SKBEDIT_F_PTYPE) && 316 nla_put_u16(skb, TCA_SKBEDIT_PTYPE, params->ptype)) 317 goto nla_put_failure; 318 if ((params->flags & SKBEDIT_F_MASK) && 319 nla_put_u32(skb, TCA_SKBEDIT_MASK, params->mask)) 320 goto nla_put_failure; 321 if (params->flags & SKBEDIT_F_INHERITDSFIELD) 322 pure_flags |= SKBEDIT_F_INHERITDSFIELD; 323 if (params->flags & SKBEDIT_F_TXQ_SKBHASH) { 324 if (nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING_MAX, 325 params->queue_mapping + params->mapping_mod - 1)) 326 goto nla_put_failure; 327 328 pure_flags |= SKBEDIT_F_TXQ_SKBHASH; 329 } 330 if (pure_flags != 0 && 331 nla_put(skb, TCA_SKBEDIT_FLAGS, sizeof(pure_flags), &pure_flags)) 332 goto nla_put_failure; 333 334 tcf_tm_dump(&t, &d->tcf_tm); 335 if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD)) 336 goto nla_put_failure; 337 rcu_read_unlock(); 338 339 return skb->len; 340 341 nla_put_failure: 342 rcu_read_unlock(); 343 nlmsg_trim(skb, b); 344 return -1; 345 } 346 347 static void tcf_skbedit_cleanup(struct tc_action *a) 348 { 349 struct tcf_skbedit *d = to_skbedit(a); 350 struct tcf_skbedit_params *params; 351 352 params = rcu_dereference_protected(d->params, 1); 353 if (params) 354 kfree_rcu(params, rcu); 355 } 356 357 static size_t tcf_skbedit_get_fill_size(const struct tc_action *act) 358 { 359 return nla_total_size(sizeof(struct tc_skbedit)) 360 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_PRIORITY */ 361 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING */ 362 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_QUEUE_MAPPING_MAX */ 363 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MARK */ 364 + nla_total_size(sizeof(u16)) /* TCA_SKBEDIT_PTYPE */ 365 + nla_total_size(sizeof(u32)) /* TCA_SKBEDIT_MASK */ 366 + nla_total_size_64bit(sizeof(u64)); /* TCA_SKBEDIT_FLAGS */ 367 } 368 369 static int tcf_skbedit_offload_act_setup(struct tc_action *act, void *entry_data, 370 u32 *index_inc, bool bind, 371 struct netlink_ext_ack *extack) 372 { 373 if (bind) { 374 struct flow_action_entry *entry = entry_data; 375 376 if (is_tcf_skbedit_mark(act)) { 377 entry->id = FLOW_ACTION_MARK; 378 entry->mark = tcf_skbedit_mark(act); 379 } else if (is_tcf_skbedit_ptype(act)) { 380 entry->id = FLOW_ACTION_PTYPE; 381 entry->ptype = tcf_skbedit_ptype(act); 382 } else if (is_tcf_skbedit_priority(act)) { 383 entry->id = FLOW_ACTION_PRIORITY; 384 entry->priority = tcf_skbedit_priority(act); 385 } else if (is_tcf_skbedit_tx_queue_mapping(act)) { 386 NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"queue_mapping\" option is used on transmit side"); 387 return -EOPNOTSUPP; 388 } else if (is_tcf_skbedit_rx_queue_mapping(act)) { 389 entry->id = FLOW_ACTION_RX_QUEUE_MAPPING; 390 entry->rx_queue = tcf_skbedit_rx_queue_mapping(act); 391 } else if (is_tcf_skbedit_inheritdsfield(act)) { 392 NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"inheritdsfield\" option is used"); 393 return -EOPNOTSUPP; 394 } else { 395 NL_SET_ERR_MSG_MOD(extack, "Unsupported skbedit option offload"); 396 return -EOPNOTSUPP; 397 } 398 *index_inc = 1; 399 } else { 400 struct flow_offload_action *fl_action = entry_data; 401 402 if (is_tcf_skbedit_mark(act)) 403 fl_action->id = FLOW_ACTION_MARK; 404 else if (is_tcf_skbedit_ptype(act)) 405 fl_action->id = FLOW_ACTION_PTYPE; 406 else if (is_tcf_skbedit_priority(act)) 407 fl_action->id = FLOW_ACTION_PRIORITY; 408 else if (is_tcf_skbedit_rx_queue_mapping(act)) 409 fl_action->id = FLOW_ACTION_RX_QUEUE_MAPPING; 410 else 411 return -EOPNOTSUPP; 412 } 413 414 return 0; 415 } 416 417 static struct tc_action_ops act_skbedit_ops = { 418 .kind = "skbedit", 419 .id = TCA_ID_SKBEDIT, 420 .owner = THIS_MODULE, 421 .act = tcf_skbedit_act, 422 .stats_update = tcf_skbedit_stats_update, 423 .dump = tcf_skbedit_dump, 424 .init = tcf_skbedit_init, 425 .cleanup = tcf_skbedit_cleanup, 426 .get_fill_size = tcf_skbedit_get_fill_size, 427 .offload_act_setup = tcf_skbedit_offload_act_setup, 428 .size = sizeof(struct tcf_skbedit), 429 }; 430 MODULE_ALIAS_NET_ACT("skbedit"); 431 432 static __net_init int skbedit_init_net(struct net *net) 433 { 434 struct tc_action_net *tn = net_generic(net, act_skbedit_ops.net_id); 435 436 return tc_action_net_init(net, tn, &act_skbedit_ops); 437 } 438 439 static void __net_exit skbedit_exit_net(struct list_head *net_list) 440 { 441 tc_action_net_exit(net_list, act_skbedit_ops.net_id); 442 } 443 444 static struct pernet_operations skbedit_net_ops = { 445 .init = skbedit_init_net, 446 .exit_batch = skbedit_exit_net, 447 .id = &act_skbedit_ops.net_id, 448 .size = sizeof(struct tc_action_net), 449 }; 450 451 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); 452 MODULE_DESCRIPTION("SKB Editing"); 453 MODULE_LICENSE("GPL"); 454 455 static int __init skbedit_init_module(void) 456 { 457 return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops); 458 } 459 460 static void __exit skbedit_cleanup_module(void) 461 { 462 tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops); 463 } 464 465 module_init(skbedit_init_module); 466 module_exit(skbedit_cleanup_module); 467