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