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Jiri Pirkoc7e2b962014-11-19 14:05:03 +01001/*
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
WANG Congddf97cc2016-02-22 15:57:53 -080024static int vlan_net_id;
25
Jiri Pirkoc7e2b962014-11-19 14:05:03 +010026static int tcf_vlan(struct sk_buff *skb, const struct tc_action *a,
27 struct tcf_result *res)
28{
29 struct tcf_vlan *v = a->priv;
30 int action;
31 int err;
32
33 spin_lock(&v->tcf_lock);
34 v->tcf_tm.lastuse = jiffies;
35 bstats_update(&v->tcf_bstats, skb);
36 action = v->tcf_action;
37
38 switch (v->tcfv_action) {
39 case TCA_VLAN_ACT_POP:
40 err = skb_vlan_pop(skb);
41 if (err)
42 goto drop;
43 break;
44 case TCA_VLAN_ACT_PUSH:
45 err = skb_vlan_push(skb, v->tcfv_push_proto, v->tcfv_push_vid);
46 if (err)
47 goto drop;
48 break;
49 default:
50 BUG();
51 }
52
53 goto unlock;
54
55drop:
56 action = TC_ACT_SHOT;
57 v->tcf_qstats.drops++;
58unlock:
59 spin_unlock(&v->tcf_lock);
60 return action;
61}
62
63static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
64 [TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) },
65 [TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 },
66 [TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 },
67};
68
69static int tcf_vlan_init(struct net *net, struct nlattr *nla,
70 struct nlattr *est, struct tc_action *a,
71 int ovr, int bind)
72{
WANG Congddf97cc2016-02-22 15:57:53 -080073 struct tc_action_net *tn = net_generic(net, vlan_net_id);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +010074 struct nlattr *tb[TCA_VLAN_MAX + 1];
75 struct tc_vlan *parm;
76 struct tcf_vlan *v;
77 int action;
78 __be16 push_vid = 0;
79 __be16 push_proto = 0;
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -040080 int ret = 0, exists = 0;
Jiri Pirkoc7e2b962014-11-19 14:05:03 +010081 int err;
82
83 if (!nla)
84 return -EINVAL;
85
86 err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy);
87 if (err < 0)
88 return err;
89
90 if (!tb[TCA_VLAN_PARMS])
91 return -EINVAL;
92 parm = nla_data(tb[TCA_VLAN_PARMS]);
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -040093 exists = tcf_hash_check(tn, parm->index, a, bind);
94 if (exists && bind)
95 return 0;
96
Jiri Pirkoc7e2b962014-11-19 14:05:03 +010097 switch (parm->v_action) {
98 case TCA_VLAN_ACT_POP:
99 break;
100 case TCA_VLAN_ACT_PUSH:
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -0400101 if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
102 if (exists)
103 tcf_hash_release(a, bind);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100104 return -EINVAL;
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -0400105 }
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100106 push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -0400107 if (push_vid >= VLAN_VID_MASK) {
108 if (exists)
109 tcf_hash_release(a, bind);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100110 return -ERANGE;
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -0400111 }
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100112
113 if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
114 push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
115 switch (push_proto) {
116 case htons(ETH_P_8021Q):
117 case htons(ETH_P_8021AD):
118 break;
119 default:
120 return -EPROTONOSUPPORT;
121 }
122 } else {
123 push_proto = htons(ETH_P_8021Q);
124 }
125 break;
126 default:
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -0400127 if (exists)
128 tcf_hash_release(a, bind);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100129 return -EINVAL;
130 }
131 action = parm->v_action;
132
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -0400133 if (!exists) {
WANG Congddf97cc2016-02-22 15:57:53 -0800134 ret = tcf_hash_create(tn, parm->index, est, a,
135 sizeof(*v), bind, false);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100136 if (ret)
137 return ret;
138
139 ret = ACT_P_CREATED;
140 } else {
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100141 tcf_hash_release(a, bind);
142 if (!ovr)
143 return -EEXIST;
144 }
145
146 v = to_vlan(a);
147
148 spin_lock_bh(&v->tcf_lock);
149
150 v->tcfv_action = action;
151 v->tcfv_push_vid = push_vid;
152 v->tcfv_push_proto = push_proto;
153
154 v->tcf_action = parm->action;
155
156 spin_unlock_bh(&v->tcf_lock);
157
158 if (ret == ACT_P_CREATED)
WANG Congddf97cc2016-02-22 15:57:53 -0800159 tcf_hash_insert(tn, a);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100160 return ret;
161}
162
163static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
164 int bind, int ref)
165{
166 unsigned char *b = skb_tail_pointer(skb);
167 struct tcf_vlan *v = a->priv;
168 struct tc_vlan opt = {
169 .index = v->tcf_index,
170 .refcnt = v->tcf_refcnt - ref,
171 .bindcnt = v->tcf_bindcnt - bind,
172 .action = v->tcf_action,
173 .v_action = v->tcfv_action,
174 };
175 struct tcf_t t;
176
177 if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
178 goto nla_put_failure;
179
180 if (v->tcfv_action == TCA_VLAN_ACT_PUSH &&
181 (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, v->tcfv_push_vid) ||
182 nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL, v->tcfv_push_proto)))
183 goto nla_put_failure;
184
185 t.install = jiffies_to_clock_t(jiffies - v->tcf_tm.install);
186 t.lastuse = jiffies_to_clock_t(jiffies - v->tcf_tm.lastuse);
187 t.expires = jiffies_to_clock_t(v->tcf_tm.expires);
188 if (nla_put(skb, TCA_VLAN_TM, sizeof(t), &t))
189 goto nla_put_failure;
190 return skb->len;
191
192nla_put_failure:
193 nlmsg_trim(skb, b);
194 return -1;
195}
196
WANG Congddf97cc2016-02-22 15:57:53 -0800197static int tcf_vlan_walker(struct net *net, struct sk_buff *skb,
198 struct netlink_callback *cb, int type,
199 struct tc_action *a)
200{
201 struct tc_action_net *tn = net_generic(net, vlan_net_id);
202
203 return tcf_generic_walker(tn, skb, cb, type, a);
204}
205
206static 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
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100213static 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,
WANG Congddf97cc2016-02-22 15:57:53 -0800220 .walk = tcf_vlan_walker,
221 .lookup = tcf_vlan_search,
222};
223
224static __net_init int vlan_init_net(struct net *net)
225{
226 struct tc_action_net *tn = net_generic(net, vlan_net_id);
227
228 return tc_action_net_init(tn, &act_vlan_ops, VLAN_TAB_MASK);
229}
230
231static void __net_exit vlan_exit_net(struct net *net)
232{
233 struct tc_action_net *tn = net_generic(net, vlan_net_id);
234
235 tc_action_net_exit(tn);
236}
237
238static struct pernet_operations vlan_net_ops = {
239 .init = vlan_init_net,
240 .exit = vlan_exit_net,
241 .id = &vlan_net_id,
242 .size = sizeof(struct tc_action_net),
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100243};
244
245static int __init vlan_init_module(void)
246{
WANG Congddf97cc2016-02-22 15:57:53 -0800247 return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100248}
249
250static void __exit vlan_cleanup_module(void)
251{
WANG Congddf97cc2016-02-22 15:57:53 -0800252 tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100253}
254
255module_init(vlan_init_module);
256module_exit(vlan_cleanup_module);
257
258MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
259MODULE_DESCRIPTION("vlan manipulation actions");
260MODULE_LICENSE("GPL v2");