1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
6 #include <linux/module.h>
7 #include <linux/init.h>
8 #include <linux/kernel.h>
9 #include <linux/skbuff.h>
10 #include <linux/rtnetlink.h>
11 #include <linux/if_vlan.h>
12 #include <net/netlink.h>
13 #include <net/pkt_sched.h>
14 #include <net/pkt_cls.h>
16 #include <linux/tc_act/tc_vlan.h>
17 #include <net/tc_act/tc_vlan.h>
19 static unsigned int vlan_net_id;
20 static struct tc_action_ops act_vlan_ops;
22 static int tcf_vlan_act(struct sk_buff *skb, const struct tc_action *a,
23 struct tcf_result *res)
25 struct tcf_vlan *v = to_vlan(a);
26 struct tcf_vlan_params *p;
31 tcf_lastuse_update(&v->tcf_tm);
32 bstats_cpu_update(this_cpu_ptr(v->common.cpu_bstats), skb);
34 /* Ensure 'data' points at mac_header prior calling vlan manipulating
37 if (skb_at_tc_ingress(skb))
38 skb_push_rcsum(skb, skb->mac_len);
40 action = READ_ONCE(v->tcf_action);
42 p = rcu_dereference_bh(v->vlan_p);
44 switch (p->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, p->tcfv_push_proto, p->tcfv_push_vid |
52 (p->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);
63 __vlan_hwaccel_clear_tag(skb);
65 /* in-payload vlan tag, pop it */
66 err = __skb_vlan_pop(skb, &tci);
71 tci = (tci & ~VLAN_VID_MASK) | p->tcfv_push_vid;
72 /* replace prio bits, if tcfv_push_prio specified */
73 if (p->tcfv_push_prio) {
74 tci &= ~VLAN_PRIO_MASK;
75 tci |= p->tcfv_push_prio << VLAN_PRIO_SHIFT;
77 /* put updated tci as hwaccel tag */
78 __vlan_hwaccel_put_tag(skb, p->tcfv_push_proto, tci);
85 if (skb_at_tc_ingress(skb))
86 skb_pull_rcsum(skb, skb->mac_len);
91 qstats_drop_inc(this_cpu_ptr(v->common.cpu_qstats));
95 static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
96 [TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) },
97 [TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 },
98 [TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 },
99 [TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 },
102 static int tcf_vlan_init(struct net *net, struct nlattr *nla,
103 struct nlattr *est, struct tc_action **a,
104 int ovr, int bind, bool rtnl_held,
105 struct tcf_proto *tp, struct netlink_ext_ack *extack)
107 struct tc_action_net *tn = net_generic(net, vlan_net_id);
108 struct nlattr *tb[TCA_VLAN_MAX + 1];
109 struct tcf_chain *goto_ch = NULL;
110 struct tcf_vlan_params *p;
111 struct tc_vlan *parm;
115 __be16 push_proto = 0;
124 err = nla_parse_nested_deprecated(tb, TCA_VLAN_MAX, nla, vlan_policy,
129 if (!tb[TCA_VLAN_PARMS])
131 parm = nla_data(tb[TCA_VLAN_PARMS]);
133 err = tcf_idr_check_alloc(tn, &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);
149 tcf_idr_cleanup(tn, index);
152 push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
153 if (push_vid >= VLAN_VID_MASK) {
155 tcf_idr_release(*a, bind);
157 tcf_idr_cleanup(tn, index);
161 if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
162 push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
163 switch (push_proto) {
164 case htons(ETH_P_8021Q):
165 case htons(ETH_P_8021AD):
169 tcf_idr_release(*a, bind);
171 tcf_idr_cleanup(tn, index);
172 return -EPROTONOSUPPORT;
175 push_proto = htons(ETH_P_8021Q);
178 if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY])
179 push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
183 tcf_idr_release(*a, bind);
185 tcf_idr_cleanup(tn, index);
188 action = parm->v_action;
191 ret = tcf_idr_create(tn, index, est, a,
192 &act_vlan_ops, bind, true);
194 tcf_idr_cleanup(tn, index);
200 tcf_idr_release(*a, bind);
204 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
210 p = kzalloc(sizeof(*p), GFP_KERNEL);
216 p->tcfv_action = action;
217 p->tcfv_push_vid = push_vid;
218 p->tcfv_push_prio = push_prio;
219 p->tcfv_push_proto = push_proto;
221 spin_lock_bh(&v->tcf_lock);
222 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
223 rcu_swap_protected(v->vlan_p, p, lockdep_is_held(&v->tcf_lock));
224 spin_unlock_bh(&v->tcf_lock);
227 tcf_chain_put_by_act(goto_ch);
231 if (ret == ACT_P_CREATED)
232 tcf_idr_insert(tn, *a);
236 tcf_chain_put_by_act(goto_ch);
238 tcf_idr_release(*a, bind);
242 static void tcf_vlan_cleanup(struct tc_action *a)
244 struct tcf_vlan *v = to_vlan(a);
245 struct tcf_vlan_params *p;
247 p = rcu_dereference_protected(v->vlan_p, 1);
252 static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
255 unsigned char *b = skb_tail_pointer(skb);
256 struct tcf_vlan *v = to_vlan(a);
257 struct tcf_vlan_params *p;
258 struct tc_vlan opt = {
259 .index = v->tcf_index,
260 .refcnt = refcount_read(&v->tcf_refcnt) - ref,
261 .bindcnt = atomic_read(&v->tcf_bindcnt) - bind,
265 spin_lock_bh(&v->tcf_lock);
266 opt.action = v->tcf_action;
267 p = rcu_dereference_protected(v->vlan_p, lockdep_is_held(&v->tcf_lock));
268 opt.v_action = p->tcfv_action;
269 if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
270 goto nla_put_failure;
272 if ((p->tcfv_action == TCA_VLAN_ACT_PUSH ||
273 p->tcfv_action == TCA_VLAN_ACT_MODIFY) &&
274 (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, p->tcfv_push_vid) ||
275 nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
276 p->tcfv_push_proto) ||
277 (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY,
278 p->tcfv_push_prio))))
279 goto nla_put_failure;
281 tcf_tm_dump(&t, &v->tcf_tm);
282 if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
283 goto nla_put_failure;
284 spin_unlock_bh(&v->tcf_lock);
289 spin_unlock_bh(&v->tcf_lock);
294 static int tcf_vlan_walker(struct net *net, struct sk_buff *skb,
295 struct netlink_callback *cb, int type,
296 const struct tc_action_ops *ops,
297 struct netlink_ext_ack *extack)
299 struct tc_action_net *tn = net_generic(net, vlan_net_id);
301 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
304 static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index)
306 struct tc_action_net *tn = net_generic(net, vlan_net_id);
308 return tcf_idr_search(tn, a, index);
311 static size_t tcf_vlan_get_fill_size(const struct tc_action *act)
313 return nla_total_size(sizeof(struct tc_vlan))
314 + nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_ID */
315 + nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_PROTOCOL */
316 + nla_total_size(sizeof(u8)); /* TCA_VLAN_PUSH_VLAN_PRIORITY */
319 static struct tc_action_ops act_vlan_ops = {
322 .owner = THIS_MODULE,
324 .dump = tcf_vlan_dump,
325 .init = tcf_vlan_init,
326 .cleanup = tcf_vlan_cleanup,
327 .walk = tcf_vlan_walker,
328 .get_fill_size = tcf_vlan_get_fill_size,
329 .lookup = tcf_vlan_search,
330 .size = sizeof(struct tcf_vlan),
333 static __net_init int vlan_init_net(struct net *net)
335 struct tc_action_net *tn = net_generic(net, vlan_net_id);
337 return tc_action_net_init(net, tn, &act_vlan_ops);
340 static void __net_exit vlan_exit_net(struct list_head *net_list)
342 tc_action_net_exit(net_list, vlan_net_id);
345 static struct pernet_operations vlan_net_ops = {
346 .init = vlan_init_net,
347 .exit_batch = vlan_exit_net,
349 .size = sizeof(struct tc_action_net),
352 static int __init vlan_init_module(void)
354 return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
357 static void __exit vlan_cleanup_module(void)
359 tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
362 module_init(vlan_init_module);
363 module_exit(vlan_cleanup_module);
365 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
366 MODULE_DESCRIPTION("vlan manipulation actions");
367 MODULE_LICENSE("GPL v2");