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);
29 struct tcf_vlan_params *p;
34 tcf_lastuse_update(&v->tcf_tm);
35 bstats_cpu_update(this_cpu_ptr(v->common.cpu_bstats), skb);
37 /* Ensure 'data' points at mac_header prior calling vlan manipulating
40 if (skb_at_tc_ingress(skb))
41 skb_push_rcsum(skb, skb->mac_len);
45 action = READ_ONCE(v->tcf_action);
47 p = rcu_dereference(v->vlan_p);
49 switch (p->tcfv_action) {
50 case TCA_VLAN_ACT_POP:
51 err = skb_vlan_pop(skb);
55 case TCA_VLAN_ACT_PUSH:
56 err = skb_vlan_push(skb, p->tcfv_push_proto, p->tcfv_push_vid |
57 (p->tcfv_push_prio << VLAN_PRIO_SHIFT));
61 case TCA_VLAN_ACT_MODIFY:
62 /* No-op if no vlan tag (either hw-accel or in-payload) */
63 if (!skb_vlan_tagged(skb))
65 /* extract existing tag (and guarantee no hw-accel tag) */
66 if (skb_vlan_tag_present(skb)) {
67 tci = skb_vlan_tag_get(skb);
70 /* in-payload vlan tag, pop it */
71 err = __skb_vlan_pop(skb, &tci);
76 tci = (tci & ~VLAN_VID_MASK) | p->tcfv_push_vid;
77 /* replace prio bits, if tcfv_push_prio specified */
78 if (p->tcfv_push_prio) {
79 tci &= ~VLAN_PRIO_MASK;
80 tci |= p->tcfv_push_prio << VLAN_PRIO_SHIFT;
82 /* put updated tci as hwaccel tag */
83 __vlan_hwaccel_put_tag(skb, p->tcfv_push_proto, tci);
93 qstats_drop_inc(this_cpu_ptr(v->common.cpu_qstats));
97 if (skb_at_tc_ingress(skb))
98 skb_pull_rcsum(skb, skb->mac_len);
103 static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
104 [TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) },
105 [TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 },
106 [TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 },
107 [TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 },
110 static int tcf_vlan_init(struct net *net, struct nlattr *nla,
111 struct nlattr *est, struct tc_action **a,
112 int ovr, int bind, struct netlink_ext_ack *extack)
114 struct tc_action_net *tn = net_generic(net, vlan_net_id);
115 struct nlattr *tb[TCA_VLAN_MAX + 1];
116 struct tcf_vlan_params *p, *p_old;
117 struct tc_vlan *parm;
121 __be16 push_proto = 0;
129 err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy, NULL);
133 if (!tb[TCA_VLAN_PARMS])
135 parm = nla_data(tb[TCA_VLAN_PARMS]);
136 exists = tcf_idr_check(tn, parm->index, a, bind);
140 switch (parm->v_action) {
141 case TCA_VLAN_ACT_POP:
143 case TCA_VLAN_ACT_PUSH:
144 case TCA_VLAN_ACT_MODIFY:
145 if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
147 tcf_idr_release(*a, bind);
150 push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
151 if (push_vid >= VLAN_VID_MASK) {
153 tcf_idr_release(*a, bind);
157 if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
158 push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
159 switch (push_proto) {
160 case htons(ETH_P_8021Q):
161 case htons(ETH_P_8021AD):
165 tcf_idr_release(*a, bind);
166 return -EPROTONOSUPPORT;
169 push_proto = htons(ETH_P_8021Q);
172 if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY])
173 push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
177 tcf_idr_release(*a, bind);
180 action = parm->v_action;
183 ret = tcf_idr_create(tn, parm->index, est, a,
184 &act_vlan_ops, bind, true);
190 tcf_idr_release(*a, bind);
198 p = kzalloc(sizeof(*p), GFP_KERNEL);
200 if (ret == ACT_P_CREATED)
201 tcf_idr_release(*a, bind);
205 v->tcf_action = parm->action;
207 p_old = rtnl_dereference(v->vlan_p);
209 p->tcfv_action = action;
210 p->tcfv_push_vid = push_vid;
211 p->tcfv_push_prio = push_prio;
212 p->tcfv_push_proto = push_proto;
214 rcu_assign_pointer(v->vlan_p, p);
217 kfree_rcu(p_old, rcu);
219 if (ret == ACT_P_CREATED)
220 tcf_idr_insert(tn, *a);
224 static void tcf_vlan_cleanup(struct tc_action *a)
226 struct tcf_vlan *v = to_vlan(a);
227 struct tcf_vlan_params *p;
229 p = rcu_dereference_protected(v->vlan_p, 1);
234 static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
237 unsigned char *b = skb_tail_pointer(skb);
238 struct tcf_vlan *v = to_vlan(a);
239 struct tcf_vlan_params *p = rtnl_dereference(v->vlan_p);
240 struct tc_vlan opt = {
241 .index = v->tcf_index,
242 .refcnt = v->tcf_refcnt - ref,
243 .bindcnt = v->tcf_bindcnt - bind,
244 .action = v->tcf_action,
245 .v_action = p->tcfv_action,
249 if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
250 goto nla_put_failure;
252 if ((p->tcfv_action == TCA_VLAN_ACT_PUSH ||
253 p->tcfv_action == TCA_VLAN_ACT_MODIFY) &&
254 (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, p->tcfv_push_vid) ||
255 nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
256 p->tcfv_push_proto) ||
257 (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY,
258 p->tcfv_push_prio))))
259 goto nla_put_failure;
261 tcf_tm_dump(&t, &v->tcf_tm);
262 if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
263 goto nla_put_failure;
271 static int tcf_vlan_walker(struct net *net, struct sk_buff *skb,
272 struct netlink_callback *cb, int type,
273 const struct tc_action_ops *ops,
274 struct netlink_ext_ack *extack)
276 struct tc_action_net *tn = net_generic(net, vlan_net_id);
278 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
281 static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index,
282 struct netlink_ext_ack *extack)
284 struct tc_action_net *tn = net_generic(net, vlan_net_id);
286 return tcf_idr_search(tn, a, index);
289 static struct tc_action_ops act_vlan_ops = {
291 .type = TCA_ACT_VLAN,
292 .owner = THIS_MODULE,
294 .dump = tcf_vlan_dump,
295 .init = tcf_vlan_init,
296 .cleanup = tcf_vlan_cleanup,
297 .walk = tcf_vlan_walker,
298 .lookup = tcf_vlan_search,
299 .size = sizeof(struct tcf_vlan),
302 static __net_init int vlan_init_net(struct net *net)
304 struct tc_action_net *tn = net_generic(net, vlan_net_id);
306 return tc_action_net_init(tn, &act_vlan_ops);
309 static void __net_exit vlan_exit_net(struct list_head *net_list)
311 tc_action_net_exit(net_list, vlan_net_id);
314 static struct pernet_operations vlan_net_ops = {
315 .init = vlan_init_net,
316 .exit_batch = vlan_exit_net,
318 .size = sizeof(struct tc_action_net),
321 static int __init vlan_init_module(void)
323 return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
326 static void __exit vlan_cleanup_module(void)
328 tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
331 module_init(vlan_init_module);
332 module_exit(vlan_cleanup_module);
334 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
335 MODULE_DESCRIPTION("vlan manipulation actions");
336 MODULE_LICENSE("GPL v2");