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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
Alexey Dobriyanc7d03a02016-11-17 04:58:21 +030022static unsigned int vlan_net_id;
WANG Conga85a9702016-07-25 16:09:41 -070023static struct tc_action_ops act_vlan_ops;
WANG Congddf97cc2016-02-22 15:57:53 -080024
Jiri Pirkoc7e2b962014-11-19 14:05:03 +010025static int tcf_vlan(struct sk_buff *skb, const struct tc_action *a,
26 struct tcf_result *res)
27{
WANG Conga85a9702016-07-25 16:09:41 -070028 struct tcf_vlan *v = to_vlan(a);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +010029 int action;
30 int err;
Shmulik Ladkani45a497f2016-09-19 19:11:10 +030031 u16 tci;
Jiri Pirkoc7e2b962014-11-19 14:05:03 +010032
33 spin_lock(&v->tcf_lock);
Jamal Hadi Salim9c4a4e42016-06-06 06:32:53 -040034 tcf_lastuse_update(&v->tcf_tm);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +010035 bstats_update(&v->tcf_bstats, skb);
36 action = v->tcf_action;
37
Shmulik Ladkanif39acc82016-09-29 12:10:40 +030038 /* Ensure 'data' points at mac_header prior calling vlan manipulating
39 * functions.
40 */
41 if (skb_at_tc_ingress(skb))
42 skb_push_rcsum(skb, skb->mac_len);
43
Jiri Pirkoc7e2b962014-11-19 14:05:03 +010044 switch (v->tcfv_action) {
45 case TCA_VLAN_ACT_POP:
46 err = skb_vlan_pop(skb);
47 if (err)
48 goto drop;
49 break;
50 case TCA_VLAN_ACT_PUSH:
Hadar Hen Zion956af372016-08-17 13:36:14 +030051 err = skb_vlan_push(skb, v->tcfv_push_proto, v->tcfv_push_vid |
52 (v->tcfv_push_prio << VLAN_PRIO_SHIFT));
Jiri Pirkoc7e2b962014-11-19 14:05:03 +010053 if (err)
54 goto drop;
55 break;
Shmulik Ladkani45a497f2016-09-19 19:11:10 +030056 case TCA_VLAN_ACT_MODIFY:
57 /* No-op if no vlan tag (either hw-accel or in-payload) */
58 if (!skb_vlan_tagged(skb))
59 goto unlock;
60 /* extract existing tag (and guarantee no hw-accel tag) */
61 if (skb_vlan_tag_present(skb)) {
62 tci = skb_vlan_tag_get(skb);
63 skb->vlan_tci = 0;
64 } else {
65 /* in-payload vlan tag, pop it */
66 err = __skb_vlan_pop(skb, &tci);
67 if (err)
68 goto drop;
69 }
70 /* replace the vid */
71 tci = (tci & ~VLAN_VID_MASK) | v->tcfv_push_vid;
72 /* replace prio bits, if tcfv_push_prio specified */
73 if (v->tcfv_push_prio) {
74 tci &= ~VLAN_PRIO_MASK;
75 tci |= v->tcfv_push_prio << VLAN_PRIO_SHIFT;
76 }
77 /* put updated tci as hwaccel tag */
78 __vlan_hwaccel_put_tag(skb, v->tcfv_push_proto, tci);
79 break;
Jiri Pirkoc7e2b962014-11-19 14:05:03 +010080 default:
81 BUG();
82 }
83
84 goto unlock;
85
86drop:
87 action = TC_ACT_SHOT;
88 v->tcf_qstats.drops++;
89unlock:
Shmulik Ladkanif39acc82016-09-29 12:10:40 +030090 if (skb_at_tc_ingress(skb))
91 skb_pull_rcsum(skb, skb->mac_len);
92
Jiri Pirkoc7e2b962014-11-19 14:05:03 +010093 spin_unlock(&v->tcf_lock);
94 return action;
95}
96
97static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
98 [TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) },
99 [TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 },
100 [TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 },
Hadar Hen Zion956af372016-08-17 13:36:14 +0300101 [TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 },
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100102};
103
104static int tcf_vlan_init(struct net *net, struct nlattr *nla,
WANG Conga85a9702016-07-25 16:09:41 -0700105 struct nlattr *est, struct tc_action **a,
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100106 int ovr, int bind)
107{
WANG Congddf97cc2016-02-22 15:57:53 -0800108 struct tc_action_net *tn = net_generic(net, vlan_net_id);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100109 struct nlattr *tb[TCA_VLAN_MAX + 1];
110 struct tc_vlan *parm;
111 struct tcf_vlan *v;
112 int action;
113 __be16 push_vid = 0;
114 __be16 push_proto = 0;
Hadar Hen Zion956af372016-08-17 13:36:14 +0300115 u8 push_prio = 0;
WANG Congb2313072016-06-13 13:46:28 -0700116 bool exists = false;
117 int ret = 0, err;
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100118
119 if (!nla)
120 return -EINVAL;
121
Johannes Bergfceb6432017-04-12 14:34:07 +0200122 err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy, NULL);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100123 if (err < 0)
124 return err;
125
126 if (!tb[TCA_VLAN_PARMS])
127 return -EINVAL;
128 parm = nla_data(tb[TCA_VLAN_PARMS]);
Chris Mi65a206c2017-08-30 02:31:59 -0400129 exists = tcf_idr_check(tn, parm->index, a, bind);
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -0400130 if (exists && bind)
131 return 0;
132
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100133 switch (parm->v_action) {
134 case TCA_VLAN_ACT_POP:
135 break;
136 case TCA_VLAN_ACT_PUSH:
Shmulik Ladkani45a497f2016-09-19 19:11:10 +0300137 case TCA_VLAN_ACT_MODIFY:
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -0400138 if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
139 if (exists)
Chris Mi65a206c2017-08-30 02:31:59 -0400140 tcf_idr_release(*a, bind);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100141 return -EINVAL;
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -0400142 }
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100143 push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -0400144 if (push_vid >= VLAN_VID_MASK) {
145 if (exists)
Chris Mi65a206c2017-08-30 02:31:59 -0400146 tcf_idr_release(*a, bind);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100147 return -ERANGE;
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -0400148 }
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100149
150 if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
151 push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
152 switch (push_proto) {
153 case htons(ETH_P_8021Q):
154 case htons(ETH_P_8021AD):
155 break;
156 default:
Davide Caratti53b2dbb2018-05-16 12:54:29 +0200157 if (exists)
158 tcf_idr_release(*a, bind);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100159 return -EPROTONOSUPPORT;
160 }
161 } else {
162 push_proto = htons(ETH_P_8021Q);
163 }
Hadar Hen Zion956af372016-08-17 13:36:14 +0300164
165 if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY])
166 push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100167 break;
168 default:
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -0400169 if (exists)
Chris Mi65a206c2017-08-30 02:31:59 -0400170 tcf_idr_release(*a, bind);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100171 return -EINVAL;
172 }
173 action = parm->v_action;
174
Jamal Hadi Salim5026c9b2016-05-10 16:49:26 -0400175 if (!exists) {
Chris Mi65a206c2017-08-30 02:31:59 -0400176 ret = tcf_idr_create(tn, parm->index, est, a,
177 &act_vlan_ops, bind, false);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100178 if (ret)
179 return ret;
180
181 ret = ACT_P_CREATED;
182 } else {
Chris Mi65a206c2017-08-30 02:31:59 -0400183 tcf_idr_release(*a, bind);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100184 if (!ovr)
185 return -EEXIST;
186 }
187
WANG Conga85a9702016-07-25 16:09:41 -0700188 v = to_vlan(*a);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100189
190 spin_lock_bh(&v->tcf_lock);
191
192 v->tcfv_action = action;
193 v->tcfv_push_vid = push_vid;
Hadar Hen Zion956af372016-08-17 13:36:14 +0300194 v->tcfv_push_prio = push_prio;
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100195 v->tcfv_push_proto = push_proto;
196
197 v->tcf_action = parm->action;
198
199 spin_unlock_bh(&v->tcf_lock);
200
201 if (ret == ACT_P_CREATED)
Chris Mi65a206c2017-08-30 02:31:59 -0400202 tcf_idr_insert(tn, *a);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100203 return ret;
204}
205
206static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
207 int bind, int ref)
208{
209 unsigned char *b = skb_tail_pointer(skb);
WANG Conga85a9702016-07-25 16:09:41 -0700210 struct tcf_vlan *v = to_vlan(a);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100211 struct tc_vlan opt = {
212 .index = v->tcf_index,
213 .refcnt = v->tcf_refcnt - ref,
214 .bindcnt = v->tcf_bindcnt - bind,
215 .action = v->tcf_action,
216 .v_action = v->tcfv_action,
217 };
218 struct tcf_t t;
219
220 if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
221 goto nla_put_failure;
222
Shmulik Ladkani45a497f2016-09-19 19:11:10 +0300223 if ((v->tcfv_action == TCA_VLAN_ACT_PUSH ||
224 v->tcfv_action == TCA_VLAN_ACT_MODIFY) &&
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100225 (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, v->tcfv_push_vid) ||
Jamal Hadi Salim0b0f43f2016-06-05 10:41:32 -0400226 nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
Hadar Hen Zion956af372016-08-17 13:36:14 +0300227 v->tcfv_push_proto) ||
228 (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY,
229 v->tcfv_push_prio))))
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100230 goto nla_put_failure;
231
Jamal Hadi Salim48d8ee12016-06-06 06:32:55 -0400232 tcf_tm_dump(&t, &v->tcf_tm);
Nicolas Dichtel98545182016-04-26 10:06:18 +0200233 if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100234 goto nla_put_failure;
235 return skb->len;
236
237nla_put_failure:
238 nlmsg_trim(skb, b);
239 return -1;
240}
241
WANG Congddf97cc2016-02-22 15:57:53 -0800242static int tcf_vlan_walker(struct net *net, struct sk_buff *skb,
243 struct netlink_callback *cb, int type,
WANG Conga85a9702016-07-25 16:09:41 -0700244 const struct tc_action_ops *ops)
WANG Congddf97cc2016-02-22 15:57:53 -0800245{
246 struct tc_action_net *tn = net_generic(net, vlan_net_id);
247
WANG Conga85a9702016-07-25 16:09:41 -0700248 return tcf_generic_walker(tn, skb, cb, type, ops);
WANG Congddf97cc2016-02-22 15:57:53 -0800249}
250
WANG Conga85a9702016-07-25 16:09:41 -0700251static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index)
WANG Congddf97cc2016-02-22 15:57:53 -0800252{
253 struct tc_action_net *tn = net_generic(net, vlan_net_id);
254
Chris Mi65a206c2017-08-30 02:31:59 -0400255 return tcf_idr_search(tn, a, index);
WANG Congddf97cc2016-02-22 15:57:53 -0800256}
257
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100258static struct tc_action_ops act_vlan_ops = {
259 .kind = "vlan",
260 .type = TCA_ACT_VLAN,
261 .owner = THIS_MODULE,
262 .act = tcf_vlan,
263 .dump = tcf_vlan_dump,
264 .init = tcf_vlan_init,
WANG Congddf97cc2016-02-22 15:57:53 -0800265 .walk = tcf_vlan_walker,
266 .lookup = tcf_vlan_search,
WANG Conga85a9702016-07-25 16:09:41 -0700267 .size = sizeof(struct tcf_vlan),
WANG Congddf97cc2016-02-22 15:57:53 -0800268};
269
270static __net_init int vlan_init_net(struct net *net)
271{
272 struct tc_action_net *tn = net_generic(net, vlan_net_id);
273
Cong Wang9fa2ddc2019-08-25 10:01:32 -0700274 return tc_action_net_init(net, tn, &act_vlan_ops);
WANG Congddf97cc2016-02-22 15:57:53 -0800275}
276
277static void __net_exit vlan_exit_net(struct net *net)
278{
279 struct tc_action_net *tn = net_generic(net, vlan_net_id);
280
281 tc_action_net_exit(tn);
282}
283
284static struct pernet_operations vlan_net_ops = {
285 .init = vlan_init_net,
286 .exit = vlan_exit_net,
287 .id = &vlan_net_id,
288 .size = sizeof(struct tc_action_net),
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100289};
290
291static int __init vlan_init_module(void)
292{
WANG Congddf97cc2016-02-22 15:57:53 -0800293 return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100294}
295
296static void __exit vlan_cleanup_module(void)
297{
WANG Congddf97cc2016-02-22 15:57:53 -0800298 tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
Jiri Pirkoc7e2b962014-11-19 14:05:03 +0100299}
300
301module_init(vlan_init_module);
302module_exit(vlan_cleanup_module);
303
304MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
305MODULE_DESCRIPTION("vlan manipulation actions");
306MODULE_LICENSE("GPL v2");