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 16 struct cls_mall_head { 17 struct tcf_exts exts; 18 struct tcf_result res; 19 u32 handle; 20 u32 flags; 21 unsigned int in_hw_count; 22 struct tc_matchall_pcnt __percpu *pf; 23 struct rcu_work rwork; 24 bool deleting; 25 }; 26 27 static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp, 28 struct tcf_result *res) 29 { 30 struct cls_mall_head *head = rcu_dereference_bh(tp->root); 31 32 if (unlikely(!head)) 33 return -1; 34 35 if (tc_skip_sw(head->flags)) 36 return -1; 37 38 *res = head->res; 39 __this_cpu_inc(head->pf->rhit); 40 return tcf_exts_exec(skb, &head->exts, res); 41 } 42 43 static int mall_init(struct tcf_proto *tp) 44 { 45 return 0; 46 } 47 48 static void __mall_destroy(struct cls_mall_head *head) 49 { 50 tcf_exts_destroy(&head->exts); 51 tcf_exts_put_net(&head->exts); 52 free_percpu(head->pf); 53 kfree(head); 54 } 55 56 static void mall_destroy_work(struct work_struct *work) 57 { 58 struct cls_mall_head *head = container_of(to_rcu_work(work), 59 struct cls_mall_head, 60 rwork); 61 rtnl_lock(); 62 __mall_destroy(head); 63 rtnl_unlock(); 64 } 65 66 static void mall_destroy_hw_filter(struct tcf_proto *tp, 67 struct cls_mall_head *head, 68 unsigned long cookie, 69 struct netlink_ext_ack *extack) 70 { 71 struct tc_cls_matchall_offload cls_mall = {}; 72 struct tcf_block *block = tp->chain->block; 73 74 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 75 cls_mall.command = TC_CLSMATCHALL_DESTROY; 76 cls_mall.cookie = cookie; 77 78 tc_setup_cb_destroy(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall, false, 79 &head->flags, &head->in_hw_count, true); 80 } 81 82 static int mall_replace_hw_filter(struct tcf_proto *tp, 83 struct cls_mall_head *head, 84 unsigned long cookie, 85 struct netlink_ext_ack *extack) 86 { 87 struct tc_cls_matchall_offload cls_mall = {}; 88 struct tcf_block *block = tp->chain->block; 89 bool skip_sw = tc_skip_sw(head->flags); 90 int err; 91 92 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts)); 93 if (!cls_mall.rule) 94 return -ENOMEM; 95 96 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 97 cls_mall.command = TC_CLSMATCHALL_REPLACE; 98 cls_mall.cookie = cookie; 99 100 err = tc_setup_offload_action(&cls_mall.rule->action, &head->exts); 101 if (err) { 102 kfree(cls_mall.rule); 103 mall_destroy_hw_filter(tp, head, cookie, NULL); 104 if (skip_sw) 105 NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action"); 106 else 107 err = 0; 108 109 return err; 110 } 111 112 err = tc_setup_cb_add(block, tp, TC_SETUP_CLSMATCHALL, &cls_mall, 113 skip_sw, &head->flags, &head->in_hw_count, true); 114 tc_cleanup_offload_action(&cls_mall.rule->action); 115 kfree(cls_mall.rule); 116 117 if (err) { 118 mall_destroy_hw_filter(tp, head, cookie, NULL); 119 return err; 120 } 121 122 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW)) 123 return -EINVAL; 124 125 return 0; 126 } 127 128 static void mall_destroy(struct tcf_proto *tp, bool rtnl_held, 129 struct netlink_ext_ack *extack) 130 { 131 struct cls_mall_head *head = rtnl_dereference(tp->root); 132 133 if (!head) 134 return; 135 136 tcf_unbind_filter(tp, &head->res); 137 138 if (!tc_skip_hw(head->flags)) 139 mall_destroy_hw_filter(tp, head, (unsigned long) head, extack); 140 141 if (tcf_exts_get_net(&head->exts)) 142 tcf_queue_work(&head->rwork, mall_destroy_work); 143 else 144 __mall_destroy(head); 145 } 146 147 static void *mall_get(struct tcf_proto *tp, u32 handle) 148 { 149 struct cls_mall_head *head = rtnl_dereference(tp->root); 150 151 if (head && head->handle == handle) 152 return head; 153 154 return NULL; 155 } 156 157 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { 158 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, 159 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, 160 [TCA_MATCHALL_FLAGS] = { .type = NLA_U32 }, 161 }; 162 163 static int mall_set_parms(struct net *net, struct tcf_proto *tp, 164 struct cls_mall_head *head, 165 unsigned long base, struct nlattr **tb, 166 struct nlattr *est, u32 flags, u32 fl_flags, 167 struct netlink_ext_ack *extack) 168 { 169 int err; 170 171 err = tcf_exts_validate_ex(net, tp, tb, est, &head->exts, flags, 172 fl_flags, extack); 173 if (err < 0) 174 return err; 175 176 if (tb[TCA_MATCHALL_CLASSID]) { 177 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); 178 tcf_bind_filter(tp, &head->res, base); 179 } 180 return 0; 181 } 182 183 static int mall_change(struct net *net, struct sk_buff *in_skb, 184 struct tcf_proto *tp, unsigned long base, 185 u32 handle, struct nlattr **tca, 186 void **arg, u32 flags, 187 struct netlink_ext_ack *extack) 188 { 189 struct cls_mall_head *head = rtnl_dereference(tp->root); 190 struct nlattr *tb[TCA_MATCHALL_MAX + 1]; 191 struct cls_mall_head *new; 192 u32 userflags = 0; 193 int err; 194 195 if (!tca[TCA_OPTIONS]) 196 return -EINVAL; 197 198 if (head) 199 return -EEXIST; 200 201 err = nla_parse_nested_deprecated(tb, TCA_MATCHALL_MAX, 202 tca[TCA_OPTIONS], mall_policy, NULL); 203 if (err < 0) 204 return err; 205 206 if (tb[TCA_MATCHALL_FLAGS]) { 207 userflags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); 208 if (!tc_flags_valid(userflags)) 209 return -EINVAL; 210 } 211 212 new = kzalloc(sizeof(*new), GFP_KERNEL); 213 if (!new) 214 return -ENOBUFS; 215 216 err = tcf_exts_init(&new->exts, net, TCA_MATCHALL_ACT, 0); 217 if (err) 218 goto err_exts_init; 219 220 if (!handle) 221 handle = 1; 222 new->handle = handle; 223 new->flags = userflags; 224 new->pf = alloc_percpu(struct tc_matchall_pcnt); 225 if (!new->pf) { 226 err = -ENOMEM; 227 goto err_alloc_percpu; 228 } 229 230 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], 231 flags, new->flags, extack); 232 if (err) 233 goto err_set_parms; 234 235 if (!tc_skip_hw(new->flags)) { 236 err = mall_replace_hw_filter(tp, new, (unsigned long)new, 237 extack); 238 if (err) 239 goto err_replace_hw_filter; 240 } 241 242 if (!tc_in_hw(new->flags)) 243 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 244 245 *arg = head; 246 rcu_assign_pointer(tp->root, new); 247 return 0; 248 249 err_replace_hw_filter: 250 err_set_parms: 251 free_percpu(new->pf); 252 err_alloc_percpu: 253 tcf_exts_destroy(&new->exts); 254 err_exts_init: 255 kfree(new); 256 return err; 257 } 258 259 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last, 260 bool rtnl_held, struct netlink_ext_ack *extack) 261 { 262 struct cls_mall_head *head = rtnl_dereference(tp->root); 263 264 head->deleting = true; 265 *last = true; 266 return 0; 267 } 268 269 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg, 270 bool rtnl_held) 271 { 272 struct cls_mall_head *head = rtnl_dereference(tp->root); 273 274 if (arg->count < arg->skip) 275 goto skip; 276 277 if (!head || head->deleting) 278 return; 279 if (arg->fn(tp, head, arg) < 0) 280 arg->stop = 1; 281 skip: 282 arg->count++; 283 } 284 285 static int mall_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb, 286 void *cb_priv, struct netlink_ext_ack *extack) 287 { 288 struct cls_mall_head *head = rtnl_dereference(tp->root); 289 struct tc_cls_matchall_offload cls_mall = {}; 290 struct tcf_block *block = tp->chain->block; 291 int err; 292 293 if (tc_skip_hw(head->flags)) 294 return 0; 295 296 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts)); 297 if (!cls_mall.rule) 298 return -ENOMEM; 299 300 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 301 cls_mall.command = add ? 302 TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY; 303 cls_mall.cookie = (unsigned long)head; 304 305 err = tc_setup_offload_action(&cls_mall.rule->action, &head->exts); 306 if (err) { 307 kfree(cls_mall.rule); 308 if (add && tc_skip_sw(head->flags)) { 309 NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action"); 310 return err; 311 } 312 return 0; 313 } 314 315 err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSMATCHALL, 316 &cls_mall, cb_priv, &head->flags, 317 &head->in_hw_count); 318 tc_cleanup_offload_action(&cls_mall.rule->action); 319 kfree(cls_mall.rule); 320 321 if (err) 322 return err; 323 324 return 0; 325 } 326 327 static void mall_stats_hw_filter(struct tcf_proto *tp, 328 struct cls_mall_head *head, 329 unsigned long cookie) 330 { 331 struct tc_cls_matchall_offload cls_mall = {}; 332 struct tcf_block *block = tp->chain->block; 333 334 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, NULL); 335 cls_mall.command = TC_CLSMATCHALL_STATS; 336 cls_mall.cookie = cookie; 337 338 tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false, true); 339 340 tcf_exts_hw_stats_update(&head->exts, cls_mall.stats.bytes, 341 cls_mall.stats.pkts, cls_mall.stats.drops, 342 cls_mall.stats.lastused, 343 cls_mall.stats.used_hw_stats, 344 cls_mall.stats.used_hw_stats_valid); 345 } 346 347 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, 348 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) 349 { 350 struct tc_matchall_pcnt gpf = {}; 351 struct cls_mall_head *head = fh; 352 struct nlattr *nest; 353 int cpu; 354 355 if (!head) 356 return skb->len; 357 358 if (!tc_skip_hw(head->flags)) 359 mall_stats_hw_filter(tp, head, (unsigned long)head); 360 361 t->tcm_handle = head->handle; 362 363 nest = nla_nest_start_noflag(skb, TCA_OPTIONS); 364 if (!nest) 365 goto nla_put_failure; 366 367 if (head->res.classid && 368 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) 369 goto nla_put_failure; 370 371 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) 372 goto nla_put_failure; 373 374 for_each_possible_cpu(cpu) { 375 struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu); 376 377 gpf.rhit += pf->rhit; 378 } 379 380 if (nla_put_64bit(skb, TCA_MATCHALL_PCNT, 381 sizeof(struct tc_matchall_pcnt), 382 &gpf, TCA_MATCHALL_PAD)) 383 goto nla_put_failure; 384 385 if (tcf_exts_dump(skb, &head->exts)) 386 goto nla_put_failure; 387 388 nla_nest_end(skb, nest); 389 390 if (tcf_exts_dump_stats(skb, &head->exts) < 0) 391 goto nla_put_failure; 392 393 return skb->len; 394 395 nla_put_failure: 396 nla_nest_cancel(skb, nest); 397 return -1; 398 } 399 400 static void mall_bind_class(void *fh, u32 classid, unsigned long cl, void *q, 401 unsigned long base) 402 { 403 struct cls_mall_head *head = fh; 404 405 if (head && head->res.classid == classid) { 406 if (cl) 407 __tcf_bind_filter(q, &head->res, base); 408 else 409 __tcf_unbind_filter(q, &head->res); 410 } 411 } 412 413 static struct tcf_proto_ops cls_mall_ops __read_mostly = { 414 .kind = "matchall", 415 .classify = mall_classify, 416 .init = mall_init, 417 .destroy = mall_destroy, 418 .get = mall_get, 419 .change = mall_change, 420 .delete = mall_delete, 421 .walk = mall_walk, 422 .reoffload = mall_reoffload, 423 .dump = mall_dump, 424 .bind_class = mall_bind_class, 425 .owner = THIS_MODULE, 426 }; 427 428 static int __init cls_mall_init(void) 429 { 430 return register_tcf_proto_ops(&cls_mall_ops); 431 } 432 433 static void __exit cls_mall_exit(void) 434 { 435 unregister_tcf_proto_ops(&cls_mall_ops); 436 } 437 438 module_init(cls_mall_init); 439 module_exit(cls_mall_exit); 440 441 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); 442 MODULE_DESCRIPTION("Match-all classifier"); 443 MODULE_LICENSE("GPL v2"); 444