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