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_flow_action(&cls_mall.rule->action, &head->exts, true); 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_flow_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 }; 161 162 static int mall_set_parms(struct net *net, struct tcf_proto *tp, 163 struct cls_mall_head *head, 164 unsigned long base, struct nlattr **tb, 165 struct nlattr *est, bool ovr, 166 struct netlink_ext_ack *extack) 167 { 168 int err; 169 170 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, true, 171 extack); 172 if (err < 0) 173 return err; 174 175 if (tb[TCA_MATCHALL_CLASSID]) { 176 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); 177 tcf_bind_filter(tp, &head->res, base); 178 } 179 return 0; 180 } 181 182 static int mall_change(struct net *net, struct sk_buff *in_skb, 183 struct tcf_proto *tp, unsigned long base, 184 u32 handle, struct nlattr **tca, 185 void **arg, bool ovr, bool rtnl_held, 186 struct netlink_ext_ack *extack) 187 { 188 struct cls_mall_head *head = rtnl_dereference(tp->root); 189 struct nlattr *tb[TCA_MATCHALL_MAX + 1]; 190 struct cls_mall_head *new; 191 u32 flags = 0; 192 int err; 193 194 if (!tca[TCA_OPTIONS]) 195 return -EINVAL; 196 197 if (head) 198 return -EEXIST; 199 200 err = nla_parse_nested_deprecated(tb, TCA_MATCHALL_MAX, 201 tca[TCA_OPTIONS], mall_policy, NULL); 202 if (err < 0) 203 return err; 204 205 if (tb[TCA_MATCHALL_FLAGS]) { 206 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); 207 if (!tc_flags_valid(flags)) 208 return -EINVAL; 209 } 210 211 new = kzalloc(sizeof(*new), GFP_KERNEL); 212 if (!new) 213 return -ENOBUFS; 214 215 err = tcf_exts_init(&new->exts, net, TCA_MATCHALL_ACT, 0); 216 if (err) 217 goto err_exts_init; 218 219 if (!handle) 220 handle = 1; 221 new->handle = handle; 222 new->flags = flags; 223 new->pf = alloc_percpu(struct tc_matchall_pcnt); 224 if (!new->pf) { 225 err = -ENOMEM; 226 goto err_alloc_percpu; 227 } 228 229 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr, 230 extack); 231 if (err) 232 goto err_set_parms; 233 234 if (!tc_skip_hw(new->flags)) { 235 err = mall_replace_hw_filter(tp, new, (unsigned long)new, 236 extack); 237 if (err) 238 goto err_replace_hw_filter; 239 } 240 241 if (!tc_in_hw(new->flags)) 242 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 243 244 *arg = head; 245 rcu_assign_pointer(tp->root, new); 246 return 0; 247 248 err_replace_hw_filter: 249 err_set_parms: 250 free_percpu(new->pf); 251 err_alloc_percpu: 252 tcf_exts_destroy(&new->exts); 253 err_exts_init: 254 kfree(new); 255 return err; 256 } 257 258 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last, 259 bool rtnl_held, struct netlink_ext_ack *extack) 260 { 261 struct cls_mall_head *head = rtnl_dereference(tp->root); 262 263 head->deleting = true; 264 *last = true; 265 return 0; 266 } 267 268 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg, 269 bool rtnl_held) 270 { 271 struct cls_mall_head *head = rtnl_dereference(tp->root); 272 273 if (arg->count < arg->skip) 274 goto skip; 275 276 if (!head || head->deleting) 277 return; 278 if (arg->fn(tp, head, arg) < 0) 279 arg->stop = 1; 280 skip: 281 arg->count++; 282 } 283 284 static int mall_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb, 285 void *cb_priv, struct netlink_ext_ack *extack) 286 { 287 struct cls_mall_head *head = rtnl_dereference(tp->root); 288 struct tc_cls_matchall_offload cls_mall = {}; 289 struct tcf_block *block = tp->chain->block; 290 int err; 291 292 if (tc_skip_hw(head->flags)) 293 return 0; 294 295 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts)); 296 if (!cls_mall.rule) 297 return -ENOMEM; 298 299 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 300 cls_mall.command = add ? 301 TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY; 302 cls_mall.cookie = (unsigned long)head; 303 304 err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts, true); 305 if (err) { 306 kfree(cls_mall.rule); 307 if (add && tc_skip_sw(head->flags)) { 308 NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action"); 309 return err; 310 } 311 return 0; 312 } 313 314 err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSMATCHALL, 315 &cls_mall, cb_priv, &head->flags, 316 &head->in_hw_count); 317 tc_cleanup_flow_action(&cls_mall.rule->action); 318 kfree(cls_mall.rule); 319 320 if (err) 321 return err; 322 323 return 0; 324 } 325 326 static void mall_stats_hw_filter(struct tcf_proto *tp, 327 struct cls_mall_head *head, 328 unsigned long cookie) 329 { 330 struct tc_cls_matchall_offload cls_mall = {}; 331 struct tcf_block *block = tp->chain->block; 332 333 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, NULL); 334 cls_mall.command = TC_CLSMATCHALL_STATS; 335 cls_mall.cookie = cookie; 336 337 tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false, true); 338 339 tcf_exts_stats_update(&head->exts, cls_mall.stats.bytes, 340 cls_mall.stats.pkts, cls_mall.stats.lastused); 341 } 342 343 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, 344 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) 345 { 346 struct tc_matchall_pcnt gpf = {}; 347 struct cls_mall_head *head = fh; 348 struct nlattr *nest; 349 int cpu; 350 351 if (!head) 352 return skb->len; 353 354 if (!tc_skip_hw(head->flags)) 355 mall_stats_hw_filter(tp, head, (unsigned long)head); 356 357 t->tcm_handle = head->handle; 358 359 nest = nla_nest_start_noflag(skb, TCA_OPTIONS); 360 if (!nest) 361 goto nla_put_failure; 362 363 if (head->res.classid && 364 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) 365 goto nla_put_failure; 366 367 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) 368 goto nla_put_failure; 369 370 for_each_possible_cpu(cpu) { 371 struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu); 372 373 gpf.rhit += pf->rhit; 374 } 375 376 if (nla_put_64bit(skb, TCA_MATCHALL_PCNT, 377 sizeof(struct tc_matchall_pcnt), 378 &gpf, TCA_MATCHALL_PAD)) 379 goto nla_put_failure; 380 381 if (tcf_exts_dump(skb, &head->exts)) 382 goto nla_put_failure; 383 384 nla_nest_end(skb, nest); 385 386 if (tcf_exts_dump_stats(skb, &head->exts) < 0) 387 goto nla_put_failure; 388 389 return skb->len; 390 391 nla_put_failure: 392 nla_nest_cancel(skb, nest); 393 return -1; 394 } 395 396 static void mall_bind_class(void *fh, u32 classid, unsigned long cl) 397 { 398 struct cls_mall_head *head = fh; 399 400 if (head && head->res.classid == classid) 401 head->res.class = cl; 402 } 403 404 static struct tcf_proto_ops cls_mall_ops __read_mostly = { 405 .kind = "matchall", 406 .classify = mall_classify, 407 .init = mall_init, 408 .destroy = mall_destroy, 409 .get = mall_get, 410 .change = mall_change, 411 .delete = mall_delete, 412 .walk = mall_walk, 413 .reoffload = mall_reoffload, 414 .dump = mall_dump, 415 .bind_class = mall_bind_class, 416 .owner = THIS_MODULE, 417 }; 418 419 static int __init cls_mall_init(void) 420 { 421 return register_tcf_proto_ops(&cls_mall_ops); 422 } 423 424 static void __exit cls_mall_exit(void) 425 { 426 unregister_tcf_proto_ops(&cls_mall_ops); 427 } 428 429 module_init(cls_mall_init); 430 module_exit(cls_mall_exit); 431 432 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); 433 MODULE_DESCRIPTION("Match-all classifier"); 434 MODULE_LICENSE("GPL v2"); 435