net/sched/act_vlan.c

   1 /*
   2  * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/skbuff.h>
  14 #include <linux/rtnetlink.h>
  15 #include <linux/if_vlan.h>
  16 #include <net/netlink.h>
  17 #include <net/pkt_sched.h>
  18
  19 #include <linux/tc_act/tc_vlan.h>
  20 #include <net/tc_act/tc_vlan.h>
  21
  22 #define VLAN_TAB_MASK     15
  23
  24 static int vlan_net_id;
  25 static struct tc_action_ops act_vlan_ops;
  26
  27 static int tcf_vlan(struct sk_buff *skb, const struct tc_action *a,
  28                     struct tcf_result *res)
  29 {
  30         struct tcf_vlan *v = to_vlan(a);
  31         int action;
  32         int err;
  33
  34         spin_lock(&v->tcf_lock);
  35         tcf_lastuse_update(&v->tcf_tm);
  36         bstats_update(&v->tcf_bstats, skb);
  37         action = v->tcf_action;
  38
  39         switch (v->tcfv_action) {
  40         case TCA_VLAN_ACT_POP:
  41                 err = skb_vlan_pop(skb);
  42                 if (err)
  43                         goto drop;
  44                 break;
  45         case TCA_VLAN_ACT_PUSH:
  46                 err = skb_vlan_push(skb, v->tcfv_push_proto, v->tcfv_push_vid);
  47                 if (err)
  48                         goto drop;
  49                 break;
  50         default:
  51                 BUG();
  52         }
  53
  54         goto unlock;
  55
  56 drop:
  57         action = TC_ACT_SHOT;
  58         v->tcf_qstats.drops++;
  59 unlock:
  60         spin_unlock(&v->tcf_lock);
  61         return action;
  62 }
  63
  64 static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
  65         [TCA_VLAN_PARMS]                = { .len = sizeof(struct tc_vlan) },
  66         [TCA_VLAN_PUSH_VLAN_ID]         = { .type = NLA_U16 },
  67         [TCA_VLAN_PUSH_VLAN_PROTOCOL]   = { .type = NLA_U16 },
  68 };
  69
  70 static int tcf_vlan_init(struct net *net, struct nlattr *nla,
  71                          struct nlattr *est, struct tc_action **a,
  72                          int ovr, int bind)
  73 {
  74         struct tc_action_net *tn = net_generic(net, vlan_net_id);
  75         struct nlattr *tb[TCA_VLAN_MAX + 1];
  76         struct tc_vlan *parm;
  77         struct tcf_vlan *v;
  78         int action;
  79         __be16 push_vid = 0;
  80         __be16 push_proto = 0;
  81         bool exists = false;
  82         int ret = 0, err;
  83
  84         if (!nla)
  85                 return -EINVAL;
  86
  87         err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy);
  88         if (err < 0)
  89                 return err;
  90
  91         if (!tb[TCA_VLAN_PARMS])
  92                 return -EINVAL;
  93         parm = nla_data(tb[TCA_VLAN_PARMS]);
  94         exists = tcf_hash_check(tn, parm->index, a, bind);
  95         if (exists && bind)
  96                 return 0;
  97
  98         switch (parm->v_action) {
  99         case TCA_VLAN_ACT_POP:
 100                 break;
 101         case TCA_VLAN_ACT_PUSH:
 102                 if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
 103                         if (exists)
 104                                 tcf_hash_release(*a, bind);
 105                         return -EINVAL;
 106                 }
 107                 push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
 108                 if (push_vid >= VLAN_VID_MASK) {
 109                         if (exists)
 110                                 tcf_hash_release(*a, bind);
 111                         return -ERANGE;
 112                 }
 113
 114                 if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
 115                         push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
 116                         switch (push_proto) {
 117                         case htons(ETH_P_8021Q):
 118                         case htons(ETH_P_8021AD):
 119                                 break;
 120                         default:
 121                                 return -EPROTONOSUPPORT;
 122                         }
 123                 } else {
 124                         push_proto = htons(ETH_P_8021Q);
 125                 }
 126                 break;
 127         default:
 128                 if (exists)
 129                         tcf_hash_release(*a, bind);
 130                 return -EINVAL;
 131         }
 132         action = parm->v_action;
 133
 134         if (!exists) {
 135                 ret = tcf_hash_create(tn, parm->index, est, a,
 136                                       &act_vlan_ops, bind, false);
 137                 if (ret)
 138                         return ret;
 139
 140                 ret = ACT_P_CREATED;
 141         } else {
 142                 tcf_hash_release(*a, bind);
 143                 if (!ovr)
 144                         return -EEXIST;
 145         }
 146
 147         v = to_vlan(*a);
 148
 149         spin_lock_bh(&v->tcf_lock);
 150
 151         v->tcfv_action = action;
 152         v->tcfv_push_vid = push_vid;
 153         v->tcfv_push_proto = push_proto;
 154
 155         v->tcf_action = parm->action;
 156
 157         spin_unlock_bh(&v->tcf_lock);
 158
 159         if (ret == ACT_P_CREATED)
 160                 tcf_hash_insert(tn, *a);
 161         return ret;
 162 }
 163
 164 static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
 165                          int bind, int ref)
 166 {
 167         unsigned char *b = skb_tail_pointer(skb);
 168         struct tcf_vlan *v = to_vlan(a);
 169         struct tc_vlan opt = {
 170                 .index    = v->tcf_index,
 171                 .refcnt   = v->tcf_refcnt - ref,
 172                 .bindcnt  = v->tcf_bindcnt - bind,
 173                 .action   = v->tcf_action,
 174                 .v_action = v->tcfv_action,
 175         };
 176         struct tcf_t t;
 177
 178         if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
 179                 goto nla_put_failure;
 180
 181         if (v->tcfv_action == TCA_VLAN_ACT_PUSH &&
 182             (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, v->tcfv_push_vid) ||
 183              nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
 184                           v->tcfv_push_proto)))
 185                 goto nla_put_failure;
 186
 187         tcf_tm_dump(&t, &v->tcf_tm);
 188         if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
 189                 goto nla_put_failure;
 190         return skb->len;
 191
 192 nla_put_failure:
 193         nlmsg_trim(skb, b);
 194         return -1;
 195 }
 196
 197 static int tcf_vlan_walker(struct net *net, struct sk_buff *skb,
 198                            struct netlink_callback *cb, int type,
 199                            const struct tc_action_ops *ops)
 200 {
 201         struct tc_action_net *tn = net_generic(net, vlan_net_id);
 202
 203         return tcf_generic_walker(tn, skb, cb, type, ops);
 204 }
 205
 206 static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index)
 207 {
 208         struct tc_action_net *tn = net_generic(net, vlan_net_id);
 209
 210         return tcf_hash_search(tn, a, index);
 211 }
 212
 213 static struct tc_action_ops act_vlan_ops = {
 214         .kind           =       "vlan",
 215         .type           =       TCA_ACT_VLAN,
 216         .owner          =       THIS_MODULE,
 217         .act            =       tcf_vlan,
 218         .dump           =       tcf_vlan_dump,
 219         .init           =       tcf_vlan_init,
 220         .walk           =       tcf_vlan_walker,
 221         .lookup         =       tcf_vlan_search,
 222         .size           =       sizeof(struct tcf_vlan),
 223 };
 224
 225 static __net_init int vlan_init_net(struct net *net)
 226 {
 227         struct tc_action_net *tn = net_generic(net, vlan_net_id);
 228
 229         return tc_action_net_init(tn, &act_vlan_ops, VLAN_TAB_MASK);
 230 }
 231
 232 static void __net_exit vlan_exit_net(struct net *net)
 233 {
 234         struct tc_action_net *tn = net_generic(net, vlan_net_id);
 235
 236         tc_action_net_exit(tn);
 237 }
 238
 239 static struct pernet_operations vlan_net_ops = {
 240         .init = vlan_init_net,
 241         .exit = vlan_exit_net,
 242         .id   = &vlan_net_id,
 243         .size = sizeof(struct tc_action_net),
 244 };
 245
 246 static int __init vlan_init_module(void)
 247 {
 248         return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
 249 }
 250
 251 static void __exit vlan_cleanup_module(void)
 252 {
 253         tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
 254 }
 255
 256 module_init(vlan_init_module);
 257 module_exit(vlan_cleanup_module);
 258
 259 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
 260 MODULE_DESCRIPTION("vlan manipulation actions");
 261 MODULE_LICENSE("GPL v2");