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 }; 25 26 static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp, 27 struct tcf_result *res) 28 { 29 struct cls_mall_head *head = rcu_dereference_bh(tp->root); 30 31 if (unlikely(!head)) 32 return -1; 33 34 if (tc_skip_sw(head->flags)) 35 return -1; 36 37 *res = head->res; 38 __this_cpu_inc(head->pf->rhit); 39 return tcf_exts_exec(skb, &head->exts, res); 40 } 41 42 static int mall_init(struct tcf_proto *tp) 43 { 44 return 0; 45 } 46 47 static void __mall_destroy(struct cls_mall_head *head) 48 { 49 tcf_exts_destroy(&head->exts); 50 tcf_exts_put_net(&head->exts); 51 free_percpu(head->pf); 52 kfree(head); 53 } 54 55 static void mall_destroy_work(struct work_struct *work) 56 { 57 struct cls_mall_head *head = container_of(to_rcu_work(work), 58 struct cls_mall_head, 59 rwork); 60 rtnl_lock(); 61 __mall_destroy(head); 62 rtnl_unlock(); 63 } 64 65 static void mall_destroy_hw_filter(struct tcf_proto *tp, 66 struct cls_mall_head *head, 67 unsigned long cookie, 68 struct netlink_ext_ack *extack) 69 { 70 struct tc_cls_matchall_offload cls_mall = {}; 71 struct tcf_block *block = tp->chain->block; 72 73 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 74 cls_mall.command = TC_CLSMATCHALL_DESTROY; 75 cls_mall.cookie = cookie; 76 77 tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false); 78 tcf_block_offload_dec(block, &head->flags); 79 } 80 81 static int mall_replace_hw_filter(struct tcf_proto *tp, 82 struct cls_mall_head *head, 83 unsigned long cookie, 84 struct netlink_ext_ack *extack) 85 { 86 struct tc_cls_matchall_offload cls_mall = {}; 87 struct tcf_block *block = tp->chain->block; 88 bool skip_sw = tc_skip_sw(head->flags); 89 int err; 90 91 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts)); 92 if (!cls_mall.rule) 93 return -ENOMEM; 94 95 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 96 cls_mall.command = TC_CLSMATCHALL_REPLACE; 97 cls_mall.cookie = cookie; 98 99 err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts); 100 if (err) { 101 kfree(cls_mall.rule); 102 mall_destroy_hw_filter(tp, head, cookie, NULL); 103 if (skip_sw) 104 NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action"); 105 else 106 err = 0; 107 108 return err; 109 } 110 111 err = tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, skip_sw); 112 kfree(cls_mall.rule); 113 114 if (err < 0) { 115 mall_destroy_hw_filter(tp, head, cookie, NULL); 116 return err; 117 } else if (err > 0) { 118 head->in_hw_count = err; 119 tcf_block_offload_inc(block, &head->flags); 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 return -EOPNOTSUPP; 262 } 263 264 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg, 265 bool rtnl_held) 266 { 267 struct cls_mall_head *head = rtnl_dereference(tp->root); 268 269 if (arg->count < arg->skip) 270 goto skip; 271 272 if (!head) 273 return; 274 if (arg->fn(tp, head, arg) < 0) 275 arg->stop = 1; 276 skip: 277 arg->count++; 278 } 279 280 static int mall_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb, 281 void *cb_priv, struct netlink_ext_ack *extack) 282 { 283 struct cls_mall_head *head = rtnl_dereference(tp->root); 284 struct tc_cls_matchall_offload cls_mall = {}; 285 struct tcf_block *block = tp->chain->block; 286 int err; 287 288 if (tc_skip_hw(head->flags)) 289 return 0; 290 291 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts)); 292 if (!cls_mall.rule) 293 return -ENOMEM; 294 295 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 296 cls_mall.command = add ? 297 TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY; 298 cls_mall.cookie = (unsigned long)head; 299 300 err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts); 301 if (err) { 302 kfree(cls_mall.rule); 303 if (add && tc_skip_sw(head->flags)) { 304 NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action"); 305 return err; 306 } 307 return 0; 308 } 309 310 err = cb(TC_SETUP_CLSMATCHALL, &cls_mall, cb_priv); 311 kfree(cls_mall.rule); 312 313 if (err) { 314 if (add && tc_skip_sw(head->flags)) 315 return err; 316 return 0; 317 } 318 319 tc_cls_offload_cnt_update(block, &head->in_hw_count, &head->flags, add); 320 321 return 0; 322 } 323 324 static void mall_stats_hw_filter(struct tcf_proto *tp, 325 struct cls_mall_head *head, 326 unsigned long cookie) 327 { 328 struct tc_cls_matchall_offload cls_mall = {}; 329 struct tcf_block *block = tp->chain->block; 330 331 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, NULL); 332 cls_mall.command = TC_CLSMATCHALL_STATS; 333 cls_mall.cookie = cookie; 334 335 tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false); 336 337 tcf_exts_stats_update(&head->exts, cls_mall.stats.bytes, 338 cls_mall.stats.pkts, cls_mall.stats.lastused); 339 } 340 341 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, 342 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) 343 { 344 struct tc_matchall_pcnt gpf = {}; 345 struct cls_mall_head *head = fh; 346 struct nlattr *nest; 347 int cpu; 348 349 if (!head) 350 return skb->len; 351 352 if (!tc_skip_hw(head->flags)) 353 mall_stats_hw_filter(tp, head, (unsigned long)head); 354 355 t->tcm_handle = head->handle; 356 357 nest = nla_nest_start_noflag(skb, TCA_OPTIONS); 358 if (!nest) 359 goto nla_put_failure; 360 361 if (head->res.classid && 362 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) 363 goto nla_put_failure; 364 365 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) 366 goto nla_put_failure; 367 368 for_each_possible_cpu(cpu) { 369 struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu); 370 371 gpf.rhit += pf->rhit; 372 } 373 374 if (nla_put_64bit(skb, TCA_MATCHALL_PCNT, 375 sizeof(struct tc_matchall_pcnt), 376 &gpf, TCA_MATCHALL_PAD)) 377 goto nla_put_failure; 378 379 if (tcf_exts_dump(skb, &head->exts)) 380 goto nla_put_failure; 381 382 nla_nest_end(skb, nest); 383 384 if (tcf_exts_dump_stats(skb, &head->exts) < 0) 385 goto nla_put_failure; 386 387 return skb->len; 388 389 nla_put_failure: 390 nla_nest_cancel(skb, nest); 391 return -1; 392 } 393 394 static void mall_bind_class(void *fh, u32 classid, unsigned long cl) 395 { 396 struct cls_mall_head *head = fh; 397 398 if (head && head->res.classid == classid) 399 head->res.class = cl; 400 } 401 402 static struct tcf_proto_ops cls_mall_ops __read_mostly = { 403 .kind = "matchall", 404 .classify = mall_classify, 405 .init = mall_init, 406 .destroy = mall_destroy, 407 .get = mall_get, 408 .change = mall_change, 409 .delete = mall_delete, 410 .walk = mall_walk, 411 .reoffload = mall_reoffload, 412 .dump = mall_dump, 413 .bind_class = mall_bind_class, 414 .owner = THIS_MODULE, 415 }; 416 417 static int __init cls_mall_init(void) 418 { 419 return register_tcf_proto_ops(&cls_mall_ops); 420 } 421 422 static void __exit cls_mall_exit(void) 423 { 424 unregister_tcf_proto_ops(&cls_mall_ops); 425 } 426 427 module_init(cls_mall_init); 428 module_exit(cls_mall_exit); 429 430 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); 431 MODULE_DESCRIPTION("Match-all classifier"); 432 MODULE_LICENSE("GPL v2"); 433