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