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 (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_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, false); 79 tcf_block_offload_dec(block, &head->flags); 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 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 93 cls_mall.command = TC_CLSMATCHALL_REPLACE; 94 cls_mall.exts = &head->exts; 95 cls_mall.cookie = cookie; 96 97 err = tc_setup_cb_call(block, TC_SETUP_CLSMATCHALL, &cls_mall, skip_sw); 98 if (err < 0) { 99 mall_destroy_hw_filter(tp, head, cookie, NULL); 100 return err; 101 } else if (err > 0) { 102 head->in_hw_count = err; 103 tcf_block_offload_inc(block, &head->flags); 104 } 105 106 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW)) 107 return -EINVAL; 108 109 return 0; 110 } 111 112 static void mall_destroy(struct tcf_proto *tp, bool rtnl_held, 113 struct netlink_ext_ack *extack) 114 { 115 struct cls_mall_head *head = rtnl_dereference(tp->root); 116 117 if (!head) 118 return; 119 120 tcf_unbind_filter(tp, &head->res); 121 122 if (!tc_skip_hw(head->flags)) 123 mall_destroy_hw_filter(tp, head, (unsigned long) head, extack); 124 125 if (tcf_exts_get_net(&head->exts)) 126 tcf_queue_work(&head->rwork, mall_destroy_work); 127 else 128 __mall_destroy(head); 129 } 130 131 static void *mall_get(struct tcf_proto *tp, u32 handle) 132 { 133 struct cls_mall_head *head = rtnl_dereference(tp->root); 134 135 if (head && head->handle == handle) 136 return head; 137 138 return NULL; 139 } 140 141 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { 142 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, 143 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, 144 }; 145 146 static int mall_set_parms(struct net *net, struct tcf_proto *tp, 147 struct cls_mall_head *head, 148 unsigned long base, struct nlattr **tb, 149 struct nlattr *est, bool ovr, 150 struct netlink_ext_ack *extack) 151 { 152 int err; 153 154 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, true, 155 extack); 156 if (err < 0) 157 return err; 158 159 if (tb[TCA_MATCHALL_CLASSID]) { 160 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); 161 tcf_bind_filter(tp, &head->res, base); 162 } 163 return 0; 164 } 165 166 static int mall_change(struct net *net, struct sk_buff *in_skb, 167 struct tcf_proto *tp, unsigned long base, 168 u32 handle, struct nlattr **tca, 169 void **arg, bool ovr, bool rtnl_held, 170 struct netlink_ext_ack *extack) 171 { 172 struct cls_mall_head *head = rtnl_dereference(tp->root); 173 struct nlattr *tb[TCA_MATCHALL_MAX + 1]; 174 struct cls_mall_head *new; 175 u32 flags = 0; 176 int err; 177 178 if (!tca[TCA_OPTIONS]) 179 return -EINVAL; 180 181 if (head) 182 return -EEXIST; 183 184 err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS], 185 mall_policy, NULL); 186 if (err < 0) 187 return err; 188 189 if (tb[TCA_MATCHALL_FLAGS]) { 190 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); 191 if (!tc_flags_valid(flags)) 192 return -EINVAL; 193 } 194 195 new = kzalloc(sizeof(*new), GFP_KERNEL); 196 if (!new) 197 return -ENOBUFS; 198 199 err = tcf_exts_init(&new->exts, net, TCA_MATCHALL_ACT, 0); 200 if (err) 201 goto err_exts_init; 202 203 if (!handle) 204 handle = 1; 205 new->handle = handle; 206 new->flags = flags; 207 new->pf = alloc_percpu(struct tc_matchall_pcnt); 208 if (!new->pf) { 209 err = -ENOMEM; 210 goto err_alloc_percpu; 211 } 212 213 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr, 214 extack); 215 if (err) 216 goto err_set_parms; 217 218 if (!tc_skip_hw(new->flags)) { 219 err = mall_replace_hw_filter(tp, new, (unsigned long)new, 220 extack); 221 if (err) 222 goto err_replace_hw_filter; 223 } 224 225 if (!tc_in_hw(new->flags)) 226 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 227 228 *arg = head; 229 rcu_assign_pointer(tp->root, new); 230 return 0; 231 232 err_replace_hw_filter: 233 err_set_parms: 234 free_percpu(new->pf); 235 err_alloc_percpu: 236 tcf_exts_destroy(&new->exts); 237 err_exts_init: 238 kfree(new); 239 return err; 240 } 241 242 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last, 243 bool rtnl_held, struct netlink_ext_ack *extack) 244 { 245 return -EOPNOTSUPP; 246 } 247 248 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg, 249 bool rtnl_held) 250 { 251 struct cls_mall_head *head = rtnl_dereference(tp->root); 252 253 if (arg->count < arg->skip) 254 goto skip; 255 256 if (!head) 257 return; 258 if (arg->fn(tp, head, arg) < 0) 259 arg->stop = 1; 260 skip: 261 arg->count++; 262 } 263 264 static int mall_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb, 265 void *cb_priv, struct netlink_ext_ack *extack) 266 { 267 struct cls_mall_head *head = rtnl_dereference(tp->root); 268 struct tc_cls_matchall_offload cls_mall = {}; 269 struct tcf_block *block = tp->chain->block; 270 int err; 271 272 if (tc_skip_hw(head->flags)) 273 return 0; 274 275 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 276 cls_mall.command = add ? 277 TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY; 278 cls_mall.exts = &head->exts; 279 cls_mall.cookie = (unsigned long)head; 280 281 err = cb(TC_SETUP_CLSMATCHALL, &cls_mall, cb_priv); 282 if (err) { 283 if (add && tc_skip_sw(head->flags)) 284 return err; 285 return 0; 286 } 287 288 tc_cls_offload_cnt_update(block, &head->in_hw_count, &head->flags, add); 289 290 return 0; 291 } 292 293 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, 294 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) 295 { 296 struct tc_matchall_pcnt gpf = {}; 297 struct cls_mall_head *head = fh; 298 struct nlattr *nest; 299 int cpu; 300 301 if (!head) 302 return skb->len; 303 304 t->tcm_handle = head->handle; 305 306 nest = nla_nest_start(skb, TCA_OPTIONS); 307 if (!nest) 308 goto nla_put_failure; 309 310 if (head->res.classid && 311 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) 312 goto nla_put_failure; 313 314 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) 315 goto nla_put_failure; 316 317 for_each_possible_cpu(cpu) { 318 struct tc_matchall_pcnt *pf = per_cpu_ptr(head->pf, cpu); 319 320 gpf.rhit += pf->rhit; 321 } 322 323 if (nla_put_64bit(skb, TCA_MATCHALL_PCNT, 324 sizeof(struct tc_matchall_pcnt), 325 &gpf, TCA_MATCHALL_PAD)) 326 goto nla_put_failure; 327 328 if (tcf_exts_dump(skb, &head->exts)) 329 goto nla_put_failure; 330 331 nla_nest_end(skb, nest); 332 333 if (tcf_exts_dump_stats(skb, &head->exts) < 0) 334 goto nla_put_failure; 335 336 return skb->len; 337 338 nla_put_failure: 339 nla_nest_cancel(skb, nest); 340 return -1; 341 } 342 343 static void mall_bind_class(void *fh, u32 classid, unsigned long cl) 344 { 345 struct cls_mall_head *head = fh; 346 347 if (head && head->res.classid == classid) 348 head->res.class = cl; 349 } 350 351 static struct tcf_proto_ops cls_mall_ops __read_mostly = { 352 .kind = "matchall", 353 .classify = mall_classify, 354 .init = mall_init, 355 .destroy = mall_destroy, 356 .get = mall_get, 357 .change = mall_change, 358 .delete = mall_delete, 359 .walk = mall_walk, 360 .reoffload = mall_reoffload, 361 .dump = mall_dump, 362 .bind_class = mall_bind_class, 363 .owner = THIS_MODULE, 364 }; 365 366 static int __init cls_mall_init(void) 367 { 368 return register_tcf_proto_ops(&cls_mall_ops); 369 } 370 371 static void __exit cls_mall_exit(void) 372 { 373 unregister_tcf_proto_ops(&cls_mall_ops); 374 } 375 376 module_init(cls_mall_init); 377 module_exit(cls_mall_exit); 378 379 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); 380 MODULE_DESCRIPTION("Match-all classifier"); 381 MODULE_LICENSE("GPL v2"); 382