2 * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
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.
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>
19 #include <linux/tc_act/tc_vlan.h>
20 #include <net/tc_act/tc_vlan.h>
22 static unsigned int vlan_net_id;
23 static struct tc_action_ops act_vlan_ops;
25 static int tcf_vlan(struct sk_buff *skb, const struct tc_action *a,
26 struct tcf_result *res)
28 struct tcf_vlan *v = to_vlan(a);
33 spin_lock(&v->tcf_lock);
34 tcf_lastuse_update(&v->tcf_tm);
35 bstats_update(&v->tcf_bstats, skb);
36 action = v->tcf_action;
38 /* Ensure 'data' points at mac_header prior calling vlan manipulating
41 if (skb_at_tc_ingress(skb))
42 skb_push_rcsum(skb, skb->mac_len);
44 switch (v->tcfv_action) {
45 case TCA_VLAN_ACT_POP:
46 err = skb_vlan_pop(skb);
50 case TCA_VLAN_ACT_PUSH:
51 err = skb_vlan_push(skb, v->tcfv_push_proto, v->tcfv_push_vid |
52 (v->tcfv_push_prio << VLAN_PRIO_SHIFT));
56 case TCA_VLAN_ACT_MODIFY:
57 /* No-op if no vlan tag (either hw-accel or in-payload) */
58 if (!skb_vlan_tagged(skb))
60 /* extract existing tag (and guarantee no hw-accel tag) */
61 if (skb_vlan_tag_present(skb)) {
62 tci = skb_vlan_tag_get(skb);
65 /* in-payload vlan tag, pop it */
66 err = __skb_vlan_pop(skb, &tci);
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;
77 /* put updated tci as hwaccel tag */
78 __vlan_hwaccel_put_tag(skb, v->tcfv_push_proto, tci);
88 v->tcf_qstats.drops++;
90 if (skb_at_tc_ingress(skb))
91 skb_pull_rcsum(skb, skb->mac_len);
93 spin_unlock(&v->tcf_lock);
97 static 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 },
101 [TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 },
104 static int tcf_vlan_init(struct net *net, struct nlattr *nla,
105 struct nlattr *est, struct tc_action **a,
108 struct tc_action_net *tn = net_generic(net, vlan_net_id);
109 struct nlattr *tb[TCA_VLAN_MAX + 1];
110 struct tc_vlan *parm;
114 __be16 push_proto = 0;
122 err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy, NULL);
126 if (!tb[TCA_VLAN_PARMS])
128 parm = nla_data(tb[TCA_VLAN_PARMS]);
129 exists = tcf_idr_check(tn, parm->index, a, bind);
133 switch (parm->v_action) {
134 case TCA_VLAN_ACT_POP:
136 case TCA_VLAN_ACT_PUSH:
137 case TCA_VLAN_ACT_MODIFY:
138 if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
140 tcf_idr_release(*a, bind);
143 push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
144 if (push_vid >= VLAN_VID_MASK) {
146 tcf_idr_release(*a, bind);
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):
157 return -EPROTONOSUPPORT;
160 push_proto = htons(ETH_P_8021Q);
163 if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY])
164 push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
168 tcf_idr_release(*a, bind);
171 action = parm->v_action;
174 ret = tcf_idr_create(tn, parm->index, est, a,
175 &act_vlan_ops, bind, false);
181 tcf_idr_release(*a, bind);
188 spin_lock_bh(&v->tcf_lock);
190 v->tcfv_action = action;
191 v->tcfv_push_vid = push_vid;
192 v->tcfv_push_prio = push_prio;
193 v->tcfv_push_proto = push_proto;
195 v->tcf_action = parm->action;
197 spin_unlock_bh(&v->tcf_lock);
199 if (ret == ACT_P_CREATED)
200 tcf_idr_insert(tn, *a);
204 static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
207 unsigned char *b = skb_tail_pointer(skb);
208 struct tcf_vlan *v = to_vlan(a);
209 struct tc_vlan opt = {
210 .index = v->tcf_index,
211 .refcnt = v->tcf_refcnt - ref,
212 .bindcnt = v->tcf_bindcnt - bind,
213 .action = v->tcf_action,
214 .v_action = v->tcfv_action,
218 if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
219 goto nla_put_failure;
221 if ((v->tcfv_action == TCA_VLAN_ACT_PUSH ||
222 v->tcfv_action == TCA_VLAN_ACT_MODIFY) &&
223 (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, v->tcfv_push_vid) ||
224 nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
225 v->tcfv_push_proto) ||
226 (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY,
227 v->tcfv_push_prio))))
228 goto nla_put_failure;
230 tcf_tm_dump(&t, &v->tcf_tm);
231 if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
232 goto nla_put_failure;
240 static int tcf_vlan_walker(struct net *net, struct sk_buff *skb,
241 struct netlink_callback *cb, int type,
242 const struct tc_action_ops *ops)
244 struct tc_action_net *tn = net_generic(net, vlan_net_id);
246 return tcf_generic_walker(tn, skb, cb, type, ops);
249 static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index)
251 struct tc_action_net *tn = net_generic(net, vlan_net_id);
253 return tcf_idr_search(tn, a, index);
256 static struct tc_action_ops act_vlan_ops = {
258 .type = TCA_ACT_VLAN,
259 .owner = THIS_MODULE,
261 .dump = tcf_vlan_dump,
262 .init = tcf_vlan_init,
263 .walk = tcf_vlan_walker,
264 .lookup = tcf_vlan_search,
265 .size = sizeof(struct tcf_vlan),
268 static __net_init int vlan_init_net(struct net *net)
270 struct tc_action_net *tn = net_generic(net, vlan_net_id);
272 return tc_action_net_init(tn, &act_vlan_ops);
275 static void __net_exit vlan_exit_net(struct net *net)
277 struct tc_action_net *tn = net_generic(net, vlan_net_id);
279 tc_action_net_exit(tn);
282 static struct pernet_operations vlan_net_ops = {
283 .init = vlan_init_net,
284 .exit = vlan_exit_net,
286 .size = sizeof(struct tc_action_net),
289 static int __init vlan_init_module(void)
291 return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
294 static void __exit vlan_cleanup_module(void)
296 tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
299 module_init(vlan_init_module);
300 module_exit(vlan_cleanup_module);
302 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
303 MODULE_DESCRIPTION("vlan manipulation actions");
304 MODULE_LICENSE("GPL v2");