1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * net/sched/cls_matchll.c Match-all classifier 4 * 5 * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com> 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/init.h> 10 #include <linux/module.h> 11 #include <linux/percpu.h> 12 13 #include <net/sch_generic.h> 14 #include <net/pkt_cls.h> 15 #include <net/tc_wrapper.h> 16 17 struct cls_mall_head { 18 struct tcf_exts exts; 19 struct tcf_result res; 20 u32 handle; 21 u32 flags; 22 unsigned int in_hw_count; 23 struct tc_matchall_pcnt __percpu *pf; 24 struct rcu_work rwork; 25 bool deleting; 26 }; 27 28 TC_INDIRECT_SCOPE int mall_classify(struct sk_buff *skb, 29 const struct tcf_proto *tp, 30 struct tcf_result *res) 31 { 32 struct cls_mall_head *head = rcu_dereference_bh(tp->root); 33 34 if (unlikely(!head)) 35 return -1; 36 37 if (tc_skip_sw(head->flags)) 38 return -1; 39 40 *res = head->res; 41 __this_cpu_inc(head->pf->rhit); 42 return tcf_exts_exec(skb, &head->exts, res); 43 } 44 45 static int mall_init(struct tcf_proto *tp) 46 { 47 return 0; 48 } 49 50 static void __mall_destroy(struct cls_mall_head *head) 51 { 52 tcf_exts_destroy(&head->exts); 53 tcf_exts_put_net(&head->exts); 54 free_percpu(head->pf); 55 kfree(head); 56 } 57 58 static void mall_destroy_work(struct work_struct *work) 59 { 60 struct cls_mall_head *head = container_of(to_rcu_work(work), 61 struct cls_mall_head, 62 rwork); 63 rtnl_lock(); 64 __mall_destroy(head); 65 rtnl_unlock(); 66 } 67 68 static void mall_destroy_hw_filter(struct tcf_proto *tp, 69 struct cls_mall_head *head, 70 unsigned long cookie, 71 struct netlink_ext_ack *extack) 72 { 73 struct tc_cls_matchall_offload cls_mall = {}; 74 struct tcf_block *block = tp->chain->block; 75 76 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 77 cls_mall.command = TC_CLSMATCHALL_DESTROY; 78 cls_mall.cookie = cookie; 79 80 tc_setup_cb_destroy(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall, false, 81 &head->flags, &head->in_hw_count, true); 82 } 83 84 static int mall_replace_hw_filter(struct tcf_proto *tp, 85 struct cls_mall_head *head, 86 unsigned long cookie, 87 struct netlink_ext_ack *extack) 88 { 89 struct tc_cls_matchall_offload cls_mall = {}; 90 struct tcf_block *block = tp->chain->block; 91 bool skip_sw = tc_skip_sw(head->flags); 92 int err; 93 94 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts)); 95 if (!cls_mall.rule) 96 return -ENOMEM; 97 98 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 99 cls_mall.command = TC_CLSMATCHALL_REPLACE; 100 cls_mall.cookie = cookie; 101 102 err = tc_setup_offload_action(&cls_mall.rule->action, &head->exts, 103 cls_mall.common.extack); 104 if (err) { 105 kfree(cls_mall.rule); 106 mall_destroy_hw_filter(tp, head, cookie, NULL); 107 108 return skip_sw ? err : 0; 109 } 110 111 err = tc_setup_cb_add(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall, 112 skip_sw, &head->flags, &head->in_hw_count, true); 113 tc_cleanup_offload_action(&cls_mall.rule->action); 114 kfree(cls_mall.rule); 115 116 if (err) { 117 mall_destroy_hw_filter(tp, head, cookie, NULL); 118 return err; 119 } 120 121 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW)) 122 return -EINVAL; 123 124 return 0; 125 } 126 127 static void mall_destroy(struct tcf_proto *tp, bool rtnl_held, 128 struct netlink_ext_ack *extack) 129 { 130 struct cls_mall_head *head = rtnl_dereference(tp->root); 131 132 if (!head) 133 return; 134 135 tcf_unbind_filter(tp, &head->res); 136 137 if (!tc_skip_hw(head->flags)) 138 mall_destroy_hw_filter(tp, head, (unsigned long) head, extack); 139 140 if (tcf_exts_get_net(&head->exts)) 141 tcf_queue_work(&head->rwork, mall_destroy_work); 142 else 143 __mall_destroy(head); 144 } 145 146 static void *mall_get(struct tcf_proto *tp, u32 handle) 147 { 148 struct cls_mall_head *head = rtnl_dereference(tp->root); 149 150 if (head && head->handle == handle) 151 return head; 152 153 return NULL; 154 } 155 156 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { 157 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, 158 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, 159 [TCA_MATCHALL_FLAGS] = { .type = NLA_U32 }, 160 }; 161 162 static int mall_change(struct net *net, struct sk_buff *in_skb, 163 struct tcf_proto *tp, unsigned long base, 164 u32 handle, struct nlattr **tca, 165 void **arg, u32 flags, 166 struct netlink_ext_ack *extack) 167 { 168 struct cls_mall_head *head = rtnl_dereference(tp->root); 169 struct nlattr *tb[TCA_MATCHALL_MAX + 1]; 170 bool bound_to_filter = false; 171 struct cls_mall_head *new; 172 u32 userflags = 0; 173 int err; 174 175 if (!tca[TCA_OPTIONS]) 176 return -EINVAL; 177 178 if (head) 179 return -EEXIST; 180 181 err = nla_parse_nested_deprecated(tb, TCA_MATCHALL_MAX, 182 tca[TCA_OPTIONS], mall_policy, NULL); 183 if (err < 0) 184 return err; 185 186 if (tb[TCA_MATCHALL_FLAGS]) { 187 userflags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); 188 if (!tc_flags_valid(userflags)) 189 return -EINVAL; 190 } 191 192 new = kzalloc(sizeof(*new), GFP_KERNEL); 193 if (!new) 194 return -ENOBUFS; 195 196 err = tcf_exts_init(&new->exts, net, TCA_MATCHALL_ACT, 0); 197 if (err) 198 goto err_exts_init; 199 200 if (!handle) 201 handle = 1; 202 new->handle = handle; 203 new->flags = userflags; 204 new->pf = alloc_percpu(struct tc_matchall_pcnt); 205 if (!new->pf) { 206 err = -ENOMEM; 207 goto err_alloc_percpu; 208 } 209 210 err = tcf_exts_validate_ex(net, tp, tb, tca[TCA_RATE], 211 &new->exts, flags, new->flags, extack); 212 if (err < 0) 213 goto err_set_parms; 214 215 if (tb[TCA_MATCHALL_CLASSID]) { 216 new->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); 217 tcf_bind_filter(tp, &new->res, base); 218 bound_to_filter = true; 219 } 220 221 if (!tc_skip_hw(new->flags)) { 222 err = mall_replace_hw_filter(tp, new, (unsigned long)new, 223 extack); 224 if (err) 225 goto err_replace_hw_filter; 226 } 227 228 if (!tc_in_hw(new->flags)) 229 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 230 231 tcf_proto_update_usesw(tp, new->flags); 232 233 *arg = head; 234 rcu_assign_pointer(tp->root, new); 235 return 0; 236 237 err_replace_hw_filter: 238 if (bound_to_filter) 239 tcf_unbind_filter(tp, &new->res); 240 err_set_parms: 241 free_percpu(new->pf); 242 err_alloc_percpu: 243 tcf_exts_destroy(&new->exts); 244 err_exts_init: 245 kfree(new); 246 return err; 247 } 248 249 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last, 250 bool rtnl_held, struct netlink_ext_ack *extack) 251 { 252 struct cls_mall_head *head = rtnl_dereference(tp->root); 253 254 head->deleting = true; 255 *last = true; 256 return 0; 257 } 258 259 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg, 260 bool rtnl_held) 261 { 262 struct cls_mall_head *head = rtnl_dereference(tp->root); 263 264 if (arg->count < arg->skip) 265 goto skip; 266 267 if (!head || head->deleting) 268 return; 269 if (arg->fn(tp, head, arg) < 0) 270 arg->stop = 1; 271 skip: 272 arg->count++; 273 } 274 275 static int mall_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb, 276 void *cb_priv, struct netlink_ext_ack *extack) 277 { 278 struct cls_mall_head *head = rtnl_dereference(tp->root); 279 struct tc_cls_matchall_offload cls_mall = {}; 280 struct tcf_block *block = tp->chain->block; 281 int err; 282 283 if (tc_skip_hw(head->flags)) 284 return 0; 285 286 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts)); 287 if (!cls_mall.rule) 288 return -ENOMEM; 289 290 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 291 cls_mall.command = add ? 292 TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY; 293 cls_mall.cookie = (unsigned long)head; 294 295 err = tc_setup_offload_action(&cls_mall.rule->action, &head->exts, 296 cls_mall.common.extack); 297 if (err) { 298 kfree(cls_mall.rule); 299 300 return add && tc_skip_sw(head->flags) ? err : 0; 301 } 302 303 err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSMATCHALL, 304 &cls_mall, cb_priv, &head->flags, 305 &head->in_hw_count); 306 tc_cleanup_offload_action(&cls_mall.rule->action); 307 kfree(cls_mall.rule); 308 309 return err; 310 } 311 312 static void mall_stats_hw_filter(struct tcf_proto *tp, 313 struct cls_mall_head *head, 314 unsigned long cookie) 315 { 316 struct tc_cls_matchall_offload cls_mall = {}; 317 struct tcf_block *block = tp->chain->block; 318 319 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, NULL); 320 cls_mall.command = TC_CLSMATCHALL_STATS; 321 cls_mall.cookie = cookie; 322 323 tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false, true); 324 325 tcf_exts_hw_stats_update(&head->exts, &cls_mall.stats, cls_mall.use_act_stats); 326 } 327 328 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, 329 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) 330 { 331 struct tc_matchall_pcnt gpf = {}; 332 struct cls_mall_head *head = fh; 333 struct nlattr *nest; 334 int cpu; 335 336 if (!head) 337 return skb->len; 338 339 if (!tc_skip_hw(head->flags)) 340 mall_stats_hw_filter(tp, head, (unsigned long)head); 341 342 t->tcm_handle = head->handle; 343 344 nest = nla_nest_start_noflag(skb, TCA_OPTIONS); 345 if (!nest) 346 goto nla_put_failure; 347 348 if (head->res.classid && 349 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) 350 goto nla_put_failure; 351 352 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) 353 goto nla_put_failure; 354 355 for_each_possible_cpu(cpu) { 356 struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu); 357 358 gpf.rhit += pf->rhit; 359 } 360 361 if (nla_put_64bit(skb, TCA_MATCHALL_PCNT, 362 sizeof(struct tc_matchall_pcnt), 363 &gpf, TCA_MATCHALL_PAD)) 364 goto nla_put_failure; 365 366 if (tcf_exts_dump(skb, &head->exts)) 367 goto nla_put_failure; 368 369 nla_nest_end(skb, nest); 370 371 if (tcf_exts_dump_stats(skb, &head->exts) < 0) 372 goto nla_put_failure; 373 374 return skb->len; 375 376 nla_put_failure: 377 nla_nest_cancel(skb, nest); 378 return -1; 379 } 380 381 static void mall_bind_class(void *fh, u32 classid, unsigned long cl, void *q, 382 unsigned long base) 383 { 384 struct cls_mall_head *head = fh; 385 386 tc_cls_bind_class(classid, cl, q, &head->res, base); 387 } 388 389 static struct tcf_proto_ops cls_mall_ops __read_mostly = { 390 .kind = "matchall", 391 .classify = mall_classify, 392 .init = mall_init, 393 .destroy = mall_destroy, 394 .get = mall_get, 395 .change = mall_change, 396 .delete = mall_delete, 397 .walk = mall_walk, 398 .reoffload = mall_reoffload, 399 .dump = mall_dump, 400 .bind_class = mall_bind_class, 401 .owner = THIS_MODULE, 402 }; 403 MODULE_ALIAS_NET_CLS("matchall"); 404 405 static int __init cls_mall_init(void) 406 { 407 return register_tcf_proto_ops(&cls_mall_ops); 408 } 409 410 static void __exit cls_mall_exit(void) 411 { 412 unregister_tcf_proto_ops(&cls_mall_ops); 413 } 414 415 module_init(cls_mall_init); 416 module_exit(cls_mall_exit); 417 418 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); 419 MODULE_DESCRIPTION("Match-all classifier"); 420 MODULE_LICENSE("GPL v2"); 421