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