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 16 #include <net/sch_generic.h> 17 #include <net/pkt_cls.h> 18 19 struct cls_mall_head { 20 struct tcf_exts exts; 21 struct tcf_result res; 22 u32 handle; 23 u32 flags; 24 unsigned int in_hw_count; 25 struct rcu_work rwork; 26 }; 27 28 static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp, 29 struct tcf_result *res) 30 { 31 struct cls_mall_head *head = rcu_dereference_bh(tp->root); 32 33 if (tc_skip_sw(head->flags)) 34 return -1; 35 36 *res = head->res; 37 return tcf_exts_exec(skb, &head->exts, res); 38 } 39 40 static int mall_init(struct tcf_proto *tp) 41 { 42 return 0; 43 } 44 45 static void __mall_destroy(struct cls_mall_head *head) 46 { 47 tcf_exts_destroy(&head->exts); 48 tcf_exts_put_net(&head->exts); 49 kfree(head); 50 } 51 52 static void mall_destroy_work(struct work_struct *work) 53 { 54 struct cls_mall_head *head = container_of(to_rcu_work(work), 55 struct cls_mall_head, 56 rwork); 57 rtnl_lock(); 58 __mall_destroy(head); 59 rtnl_unlock(); 60 } 61 62 static void mall_destroy_hw_filter(struct tcf_proto *tp, 63 struct cls_mall_head *head, 64 unsigned long cookie, 65 struct netlink_ext_ack *extack) 66 { 67 struct tc_cls_matchall_offload cls_mall = {}; 68 struct tcf_block *block = tp->chain->block; 69 70 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 71 cls_mall.command = TC_CLSMATCHALL_DESTROY; 72 cls_mall.cookie = cookie; 73 74 tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL, &cls_mall, false); 75 tcf_block_offload_dec(block, &head->flags); 76 } 77 78 static int mall_replace_hw_filter(struct tcf_proto *tp, 79 struct cls_mall_head *head, 80 unsigned long cookie, 81 struct netlink_ext_ack *extack) 82 { 83 struct tc_cls_matchall_offload cls_mall = {}; 84 struct tcf_block *block = tp->chain->block; 85 bool skip_sw = tc_skip_sw(head->flags); 86 int err; 87 88 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 89 cls_mall.command = TC_CLSMATCHALL_REPLACE; 90 cls_mall.exts = &head->exts; 91 cls_mall.cookie = cookie; 92 93 err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL, 94 &cls_mall, skip_sw); 95 if (err < 0) { 96 mall_destroy_hw_filter(tp, head, cookie, NULL); 97 return err; 98 } else if (err > 0) { 99 head->in_hw_count = err; 100 tcf_block_offload_inc(block, &head->flags); 101 } 102 103 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW)) 104 return -EINVAL; 105 106 return 0; 107 } 108 109 static void mall_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack) 110 { 111 struct cls_mall_head *head = rtnl_dereference(tp->root); 112 113 if (!head) 114 return; 115 116 tcf_unbind_filter(tp, &head->res); 117 118 if (!tc_skip_hw(head->flags)) 119 mall_destroy_hw_filter(tp, head, (unsigned long) head, extack); 120 121 if (tcf_exts_get_net(&head->exts)) 122 tcf_queue_work(&head->rwork, mall_destroy_work); 123 else 124 __mall_destroy(head); 125 } 126 127 static void *mall_get(struct tcf_proto *tp, u32 handle) 128 { 129 return NULL; 130 } 131 132 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { 133 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, 134 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, 135 }; 136 137 static int mall_set_parms(struct net *net, struct tcf_proto *tp, 138 struct cls_mall_head *head, 139 unsigned long base, struct nlattr **tb, 140 struct nlattr *est, bool ovr, 141 struct netlink_ext_ack *extack) 142 { 143 int err; 144 145 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, extack); 146 if (err < 0) 147 return err; 148 149 if (tb[TCA_MATCHALL_CLASSID]) { 150 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); 151 tcf_bind_filter(tp, &head->res, base); 152 } 153 return 0; 154 } 155 156 static int mall_change(struct net *net, struct sk_buff *in_skb, 157 struct tcf_proto *tp, unsigned long base, 158 u32 handle, struct nlattr **tca, 159 void **arg, bool ovr, struct netlink_ext_ack *extack) 160 { 161 struct cls_mall_head *head = rtnl_dereference(tp->root); 162 struct nlattr *tb[TCA_MATCHALL_MAX + 1]; 163 struct cls_mall_head *new; 164 u32 flags = 0; 165 int err; 166 167 if (!tca[TCA_OPTIONS]) 168 return -EINVAL; 169 170 if (head) 171 return -EEXIST; 172 173 err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS], 174 mall_policy, NULL); 175 if (err < 0) 176 return err; 177 178 if (tb[TCA_MATCHALL_FLAGS]) { 179 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); 180 if (!tc_flags_valid(flags)) 181 return -EINVAL; 182 } 183 184 new = kzalloc(sizeof(*new), GFP_KERNEL); 185 if (!new) 186 return -ENOBUFS; 187 188 err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0); 189 if (err) 190 goto err_exts_init; 191 192 if (!handle) 193 handle = 1; 194 new->handle = handle; 195 new->flags = flags; 196 197 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr, 198 extack); 199 if (err) 200 goto err_set_parms; 201 202 if (!tc_skip_hw(new->flags)) { 203 err = mall_replace_hw_filter(tp, new, (unsigned long)new, 204 extack); 205 if (err) 206 goto err_replace_hw_filter; 207 } 208 209 if (!tc_in_hw(new->flags)) 210 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 211 212 *arg = head; 213 rcu_assign_pointer(tp->root, new); 214 return 0; 215 216 err_replace_hw_filter: 217 err_set_parms: 218 tcf_exts_destroy(&new->exts); 219 err_exts_init: 220 kfree(new); 221 return err; 222 } 223 224 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last, 225 struct netlink_ext_ack *extack) 226 { 227 return -EOPNOTSUPP; 228 } 229 230 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg) 231 { 232 struct cls_mall_head *head = rtnl_dereference(tp->root); 233 234 if (arg->count < arg->skip) 235 goto skip; 236 if (arg->fn(tp, head, arg) < 0) 237 arg->stop = 1; 238 skip: 239 arg->count++; 240 } 241 242 static int mall_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb, 243 void *cb_priv, struct netlink_ext_ack *extack) 244 { 245 struct cls_mall_head *head = rtnl_dereference(tp->root); 246 struct tc_cls_matchall_offload cls_mall = {}; 247 struct tcf_block *block = tp->chain->block; 248 int err; 249 250 if (tc_skip_hw(head->flags)) 251 return 0; 252 253 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 254 cls_mall.command = add ? 255 TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY; 256 cls_mall.exts = &head->exts; 257 cls_mall.cookie = (unsigned long)head; 258 259 err = cb(TC_SETUP_CLSMATCHALL, &cls_mall, cb_priv); 260 if (err) { 261 if (add && tc_skip_sw(head->flags)) 262 return err; 263 return 0; 264 } 265 266 tc_cls_offload_cnt_update(block, &head->in_hw_count, &head->flags, add); 267 268 return 0; 269 } 270 271 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, 272 struct sk_buff *skb, struct tcmsg *t) 273 { 274 struct cls_mall_head *head = fh; 275 struct nlattr *nest; 276 277 if (!head) 278 return skb->len; 279 280 t->tcm_handle = head->handle; 281 282 nest = nla_nest_start(skb, TCA_OPTIONS); 283 if (!nest) 284 goto nla_put_failure; 285 286 if (head->res.classid && 287 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) 288 goto nla_put_failure; 289 290 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) 291 goto nla_put_failure; 292 293 if (tcf_exts_dump(skb, &head->exts)) 294 goto nla_put_failure; 295 296 nla_nest_end(skb, nest); 297 298 if (tcf_exts_dump_stats(skb, &head->exts) < 0) 299 goto nla_put_failure; 300 301 return skb->len; 302 303 nla_put_failure: 304 nla_nest_cancel(skb, nest); 305 return -1; 306 } 307 308 static void mall_bind_class(void *fh, u32 classid, unsigned long cl) 309 { 310 struct cls_mall_head *head = fh; 311 312 if (head && head->res.classid == classid) 313 head->res.class = cl; 314 } 315 316 static struct tcf_proto_ops cls_mall_ops __read_mostly = { 317 .kind = "matchall", 318 .classify = mall_classify, 319 .init = mall_init, 320 .destroy = mall_destroy, 321 .get = mall_get, 322 .change = mall_change, 323 .delete = mall_delete, 324 .walk = mall_walk, 325 .reoffload = mall_reoffload, 326 .dump = mall_dump, 327 .bind_class = mall_bind_class, 328 .owner = THIS_MODULE, 329 }; 330 331 static int __init cls_mall_init(void) 332 { 333 return register_tcf_proto_ops(&cls_mall_ops); 334 } 335 336 static void __exit cls_mall_exit(void) 337 { 338 unregister_tcf_proto_ops(&cls_mall_ops); 339 } 340 341 module_init(cls_mall_init); 342 module_exit(cls_mall_exit); 343 344 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); 345 MODULE_DESCRIPTION("Match-all classifier"); 346 MODULE_LICENSE("GPL v2"); 347