1 /* 2 * net/sched/cls_matchll.c Match-all classifier 3 * 4 * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/percpu.h> 16 17 #include <net/sch_generic.h> 18 #include <net/pkt_cls.h> 19 20 struct cls_mall_head { 21 struct tcf_exts exts; 22 struct tcf_result res; 23 u32 handle; 24 u32 flags; 25 unsigned int in_hw_count; 26 struct tc_matchall_pcnt __percpu *pf; 27 struct rcu_work rwork; 28 }; 29 30 static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp, 31 struct tcf_result *res) 32 { 33 struct cls_mall_head *head = rcu_dereference_bh(tp->root); 34 35 if (unlikely(!head)) 36 return -1; 37 38 if (tc_skip_sw(head->flags)) 39 return -1; 40 41 *res = head->res; 42 __this_cpu_inc(head->pf->rhit); 43 return tcf_exts_exec(skb, &head->exts, res); 44 } 45 46 static int mall_init(struct tcf_proto *tp) 47 { 48 return 0; 49 } 50 51 static void __mall_destroy(struct cls_mall_head *head) 52 { 53 tcf_exts_destroy(&head->exts); 54 tcf_exts_put_net(&head->exts); 55 free_percpu(head->pf); 56 kfree(head); 57 } 58 59 static void mall_destroy_work(struct work_struct *work) 60 { 61 struct cls_mall_head *head = container_of(to_rcu_work(work), 62 struct cls_mall_head, 63 rwork); 64 rtnl_lock(); 65 __mall_destroy(head); 66 rtnl_unlock(); 67 } 68 69 static void mall_destroy_hw_filter(struct tcf_proto *tp, 70 struct cls_mall_head *head, 71 unsigned long cookie, 72 struct netlink_ext_ack *extack) 73 { 74 struct tc_cls_matchall_offload cls_mall = {}; 75 struct tcf_block *block = tp->chain->block; 76 77 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 78 cls_mall.command = TC_CLSMATCHALL_DESTROY; 79 cls_mall.cookie = cookie; 80 81 tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false); 82 tcf_block_offload_dec(block, &head->flags); 83 } 84 85 static int mall_replace_hw_filter(struct tcf_proto *tp, 86 struct cls_mall_head *head, 87 unsigned long cookie, 88 struct netlink_ext_ack *extack) 89 { 90 struct tc_cls_matchall_offload cls_mall = {}; 91 struct tcf_block *block = tp->chain->block; 92 bool skip_sw = tc_skip_sw(head->flags); 93 int err; 94 95 cls_mall.rule = flow_rule_alloc(tcf_exts_num_actions(&head->exts)); 96 if (!cls_mall.rule) 97 return -ENOMEM; 98 99 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 100 cls_mall.command = TC_CLSMATCHALL_REPLACE; 101 cls_mall.cookie = cookie; 102 103 err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts); 104 if (err) { 105 kfree(cls_mall.rule); 106 mall_destroy_hw_filter(tp, head, cookie, NULL); 107 if (skip_sw) 108 NL_SET_ERR_MSG_MOD(extack, "Failed to setup flow action"); 109 else 110 err = 0; 111 112 return err; 113 } 114 115 err = tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, skip_sw); 116 kfree(cls_mall.rule); 117 118 if (err < 0) { 119 mall_destroy_hw_filter(tp, head, cookie, NULL); 120 return err; 121 } else if (err > 0) { 122 head->in_hw_count = err; 123 tcf_block_offload_inc(block, &head->flags); 124 } 125 126 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW)) 127 return -EINVAL; 128 129 return 0; 130 } 131 132 static void mall_destroy(struct tcf_proto *tp, bool rtnl_held, 133 struct netlink_ext_ack *extack) 134 { 135 struct cls_mall_head *head = rtnl_dereference(tp->root); 136 137 if (!head) 138 return; 139 140 tcf_unbind_filter(tp, &head->res); 141 142 if (!tc_skip_hw(head->flags)) 143 mall_destroy_hw_filter(tp, head, (unsigned long) head, extack); 144 145 if (tcf_exts_get_net(&head->exts)) 146 tcf_queue_work(&head->rwork, mall_destroy_work); 147 else 148 __mall_destroy(head); 149 } 150 151 static void *mall_get(struct tcf_proto *tp, u32 handle) 152 { 153 struct cls_mall_head *head = rtnl_dereference(tp->root); 154 155 if (head && head->handle == handle) 156 return head; 157 158 return NULL; 159 } 160 161 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { 162 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, 163 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, 164 }; 165 166 static int mall_set_parms(struct net *net, struct tcf_proto *tp, 167 struct cls_mall_head *head, 168 unsigned long base, struct nlattr **tb, 169 struct nlattr *est, bool ovr, 170 struct netlink_ext_ack *extack) 171 { 172 int err; 173 174 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, true, 175 extack); 176 if (err < 0) 177 return err; 178 179 if (tb[TCA_MATCHALL_CLASSID]) { 180 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); 181 tcf_bind_filter(tp, &head->res, base); 182 } 183 return 0; 184 } 185 186 static int mall_change(struct net *net, struct sk_buff *in_skb, 187 struct tcf_proto *tp, unsigned long base, 188 u32 handle, struct nlattr **tca, 189 void **arg, bool ovr, bool rtnl_held, 190 struct netlink_ext_ack *extack) 191 { 192 struct cls_mall_head *head = rtnl_dereference(tp->root); 193 struct nlattr *tb[TCA_MATCHALL_MAX + 1]; 194 struct cls_mall_head *new; 195 u32 flags = 0; 196 int err; 197 198 if (!tca[TCA_OPTIONS]) 199 return -EINVAL; 200 201 if (head) 202 return -EEXIST; 203 204 err = nla_parse_nested_deprecated(tb, TCA_MATCHALL_MAX, 205 tca[TCA_OPTIONS], mall_policy, NULL); 206 if (err < 0) 207 return err; 208 209 if (tb[TCA_MATCHALL_FLAGS]) { 210 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); 211 if (!tc_flags_valid(flags)) 212 return -EINVAL; 213 } 214 215 new = kzalloc(sizeof(*new), GFP_KERNEL); 216 if (!new) 217 return -ENOBUFS; 218 219 err = tcf_exts_init(&new->exts, net, TCA_MATCHALL_ACT, 0); 220 if (err) 221 goto err_exts_init; 222 223 if (!handle) 224 handle = 1; 225 new->handle = handle; 226 new->flags = flags; 227 new->pf = alloc_percpu(struct tc_matchall_pcnt); 228 if (!new->pf) { 229 err = -ENOMEM; 230 goto err_alloc_percpu; 231 } 232 233 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr, 234 extack); 235 if (err) 236 goto err_set_parms; 237 238 if (!tc_skip_hw(new->flags)) { 239 err = mall_replace_hw_filter(tp, new, (unsigned long)new, 240 extack); 241 if (err) 242 goto err_replace_hw_filter; 243 } 244 245 if (!tc_in_hw(new->flags)) 246 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 247 248 *arg = head; 249 rcu_assign_pointer(tp->root, new); 250 return 0; 251 252 err_replace_hw_filter: 253 err_set_parms: 254 free_percpu(new->pf); 255 err_alloc_percpu: 256 tcf_exts_destroy(&new->exts); 257 err_exts_init: 258 kfree(new); 259 return err; 260 } 261 262 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last, 263 bool rtnl_held, struct netlink_ext_ack *extack) 264 { 265 return -EOPNOTSUPP; 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) 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, tc_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); 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 = cb(TC_SETUP_CLSMATCHALL, &cls_mall, cb_priv); 315 kfree(cls_mall.rule); 316 317 if (err) { 318 if (add && tc_skip_sw(head->flags)) 319 return err; 320 return 0; 321 } 322 323 tc_cls_offload_cnt_update(block, &head->in_hw_count, &head->flags, add); 324 325 return 0; 326 } 327 328 static void mall_stats_hw_filter(struct tcf_proto *tp, 329 struct cls_mall_head *head, 330 unsigned long cookie) 331 { 332 struct tc_cls_matchall_offload cls_mall = {}; 333 struct tcf_block *block = tp->chain->block; 334 335 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, NULL); 336 cls_mall.command = TC_CLSMATCHALL_STATS; 337 cls_mall.cookie = cookie; 338 339 tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false); 340 341 tcf_exts_stats_update(&head->exts, cls_mall.stats.bytes, 342 cls_mall.stats.pkts, cls_mall.stats.lastused); 343 } 344 345 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, 346 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) 347 { 348 struct tc_matchall_pcnt gpf = {}; 349 struct cls_mall_head *head = fh; 350 struct nlattr *nest; 351 int cpu; 352 353 if (!head) 354 return skb->len; 355 356 if (!tc_skip_hw(head->flags)) 357 mall_stats_hw_filter(tp, head, (unsigned long)head); 358 359 t->tcm_handle = head->handle; 360 361 nest = nla_nest_start_noflag(skb, TCA_OPTIONS); 362 if (!nest) 363 goto nla_put_failure; 364 365 if (head->res.classid && 366 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) 367 goto nla_put_failure; 368 369 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) 370 goto nla_put_failure; 371 372 for_each_possible_cpu(cpu) { 373 struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu); 374 375 gpf.rhit += pf->rhit; 376 } 377 378 if (nla_put_64bit(skb, TCA_MATCHALL_PCNT, 379 sizeof(struct tc_matchall_pcnt), 380 &gpf, TCA_MATCHALL_PAD)) 381 goto nla_put_failure; 382 383 if (tcf_exts_dump(skb, &head->exts)) 384 goto nla_put_failure; 385 386 nla_nest_end(skb, nest); 387 388 if (tcf_exts_dump_stats(skb, &head->exts) < 0) 389 goto nla_put_failure; 390 391 return skb->len; 392 393 nla_put_failure: 394 nla_nest_cancel(skb, nest); 395 return -1; 396 } 397 398 static void mall_bind_class(void *fh, u32 classid, unsigned long cl) 399 { 400 struct cls_mall_head *head = fh; 401 402 if (head && head->res.classid == classid) 403 head->res.class = cl; 404 } 405 406 static struct tcf_proto_ops cls_mall_ops __read_mostly = { 407 .kind = "matchall", 408 .classify = mall_classify, 409 .init = mall_init, 410 .destroy = mall_destroy, 411 .get = mall_get, 412 .change = mall_change, 413 .delete = mall_delete, 414 .walk = mall_walk, 415 .reoffload = mall_reoffload, 416 .dump = mall_dump, 417 .bind_class = mall_bind_class, 418 .owner = THIS_MODULE, 419 }; 420 421 static int __init cls_mall_init(void) 422 { 423 return register_tcf_proto_ops(&cls_mall_ops); 424 } 425 426 static void __exit cls_mall_exit(void) 427 { 428 unregister_tcf_proto_ops(&cls_mall_ops); 429 } 430 431 module_init(cls_mall_init); 432 module_exit(cls_mall_exit); 433 434 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); 435 MODULE_DESCRIPTION("Match-all classifier"); 436 MODULE_LICENSE("GPL v2"); 437