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