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_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, u32 flags, u32 fl_flags, 166 struct netlink_ext_ack *extack) 167 { 168 int err; 169 170 err = tcf_exts_validate_ex(net, tp, tb, est, &head->exts, flags, 171 fl_flags, 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, u32 flags, 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 userflags = 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 userflags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); 207 if (!tc_flags_valid(userflags)) 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 = userflags; 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], 230 flags, new->flags, 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_offload_action(&cls_mall.rule->action, &head->exts, 305 cls_mall.common.extack); 306 if (err) { 307 kfree(cls_mall.rule); 308 309 return add && tc_skip_sw(head->flags) ? err : 0; 310 } 311 312 err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSMATCHALL, 313 &cls_mall, cb_priv, &head->flags, 314 &head->in_hw_count); 315 tc_cleanup_offload_action(&cls_mall.rule->action); 316 kfree(cls_mall.rule); 317 318 return err; 319 } 320 321 static void mall_stats_hw_filter(struct tcf_proto *tp, 322 struct cls_mall_head *head, 323 unsigned long cookie) 324 { 325 struct tc_cls_matchall_offload cls_mall = {}; 326 struct tcf_block *block = tp->chain->block; 327 328 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, NULL); 329 cls_mall.command = TC_CLSMATCHALL_STATS; 330 cls_mall.cookie = cookie; 331 332 tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false, true); 333 334 tcf_exts_hw_stats_update(&head->exts, &cls_mall.stats, cls_mall.use_act_stats); 335 } 336 337 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, 338 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) 339 { 340 struct tc_matchall_pcnt gpf = {}; 341 struct cls_mall_head *head = fh; 342 struct nlattr *nest; 343 int cpu; 344 345 if (!head) 346 return skb->len; 347 348 if (!tc_skip_hw(head->flags)) 349 mall_stats_hw_filter(tp, head, (unsigned long)head); 350 351 t->tcm_handle = head->handle; 352 353 nest = nla_nest_start_noflag(skb, TCA_OPTIONS); 354 if (!nest) 355 goto nla_put_failure; 356 357 if (head->res.classid && 358 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) 359 goto nla_put_failure; 360 361 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) 362 goto nla_put_failure; 363 364 for_each_possible_cpu(cpu) { 365 struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu); 366 367 gpf.rhit += pf->rhit; 368 } 369 370 if (nla_put_64bit(skb, TCA_MATCHALL_PCNT, 371 sizeof(struct tc_matchall_pcnt), 372 &gpf, TCA_MATCHALL_PAD)) 373 goto nla_put_failure; 374 375 if (tcf_exts_dump(skb, &head->exts)) 376 goto nla_put_failure; 377 378 nla_nest_end(skb, nest); 379 380 if (tcf_exts_dump_stats(skb, &head->exts) < 0) 381 goto nla_put_failure; 382 383 return skb->len; 384 385 nla_put_failure: 386 nla_nest_cancel(skb, nest); 387 return -1; 388 } 389 390 static void mall_bind_class(void *fh, u32 classid, unsigned long cl, void *q, 391 unsigned long base) 392 { 393 struct cls_mall_head *head = fh; 394 395 tc_cls_bind_class(classid, cl, q, &head->res, base); 396 } 397 398 static struct tcf_proto_ops cls_mall_ops __read_mostly = { 399 .kind = "matchall", 400 .classify = mall_classify, 401 .init = mall_init, 402 .destroy = mall_destroy, 403 .get = mall_get, 404 .change = mall_change, 405 .delete = mall_delete, 406 .walk = mall_walk, 407 .reoffload = mall_reoffload, 408 .dump = mall_dump, 409 .bind_class = mall_bind_class, 410 .owner = THIS_MODULE, 411 }; 412 413 static int __init cls_mall_init(void) 414 { 415 return register_tcf_proto_ops(&cls_mall_ops); 416 } 417 418 static void __exit cls_mall_exit(void) 419 { 420 unregister_tcf_proto_ops(&cls_mall_ops); 421 } 422 423 module_init(cls_mall_init); 424 module_exit(cls_mall_exit); 425 426 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); 427 MODULE_DESCRIPTION("Match-all classifier"); 428 MODULE_LICENSE("GPL v2"); 429