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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
4 */
5
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>
15
16#include <linux/tc_act/tc_vlan.h>
17#include <net/tc_act/tc_vlan.h>
18
19static unsigned int vlan_net_id;
20static struct tc_action_ops act_vlan_ops;
21
22static int tcf_vlan_act(struct sk_buff *skb, const struct tc_action *a,
23 struct tcf_result *res)
24{
25 struct tcf_vlan *v = to_vlan(a);
26 struct tcf_vlan_params *p;
27 int action;
28 int err;
29 u16 tci;
30
31 tcf_lastuse_update(&v->tcf_tm);
32 bstats_cpu_update(this_cpu_ptr(v->common.cpu_bstats), skb);
33
34 /* Ensure 'data' points at mac_header prior calling vlan manipulating
35 * functions.
36 */
37 if (skb_at_tc_ingress(skb))
38 skb_push_rcsum(skb, skb->mac_len);
39
40 action = READ_ONCE(v->tcf_action);
41
42 p = rcu_dereference_bh(v->vlan_p);
43
44 switch (p->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:
51 err = skb_vlan_push(skb, p->tcfv_push_proto, p->tcfv_push_vid |
52 (p->tcfv_push_prio << VLAN_PRIO_SHIFT));
53 if (err)
54 goto drop;
55 break;
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))
59 goto out;
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);
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) | 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;
76 }
77 /* put updated tci as hwaccel tag */
78 __vlan_hwaccel_put_tag(skb, p->tcfv_push_proto, tci);
79 break;
80 default:
81 BUG();
82 }
83
84out:
85 if (skb_at_tc_ingress(skb))
86 skb_pull_rcsum(skb, skb->mac_len);
87
88 return action;
89
90drop:
91 qstats_drop_inc(this_cpu_ptr(v->common.cpu_qstats));
92 return TC_ACT_SHOT;
93}
94
95static 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 },
100};
101
102static 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)
106{
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;
112 struct tcf_vlan *v;
113 int action;
114 u16 push_vid = 0;
115 __be16 push_proto = 0;
116 u8 push_prio = 0;
117 bool exists = false;
118 int ret = 0, err;
119 u32 index;
120
121 if (!nla)
122 return -EINVAL;
123
124 err = nla_parse_nested_deprecated(tb, TCA_VLAN_MAX, nla, vlan_policy,
125 NULL);
126 if (err < 0)
127 return err;
128
129 if (!tb[TCA_VLAN_PARMS])
130 return -EINVAL;
131 parm = nla_data(tb[TCA_VLAN_PARMS]);
132 index = parm->index;
133 err = tcf_idr_check_alloc(tn, &index, a, bind);
134 if (err < 0)
135 return err;
136 exists = err;
137 if (exists && bind)
138 return 0;
139
140 switch (parm->v_action) {
141 case TCA_VLAN_ACT_POP:
142 break;
143 case TCA_VLAN_ACT_PUSH:
144 case TCA_VLAN_ACT_MODIFY:
145 if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
146 if (exists)
147 tcf_idr_release(*a, bind);
148 else
149 tcf_idr_cleanup(tn, index);
150 return -EINVAL;
151 }
152 push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
153 if (push_vid >= VLAN_VID_MASK) {
154 if (exists)
155 tcf_idr_release(*a, bind);
156 else
157 tcf_idr_cleanup(tn, index);
158 return -ERANGE;
159 }
160
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):
166 break;
167 default:
168 if (exists)
169 tcf_idr_release(*a, bind);
170 else
171 tcf_idr_cleanup(tn, index);
172 return -EPROTONOSUPPORT;
173 }
174 } else {
175 push_proto = htons(ETH_P_8021Q);
176 }
177
178 if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY])
179 push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
180 break;
181 default:
182 if (exists)
183 tcf_idr_release(*a, bind);
184 else
185 tcf_idr_cleanup(tn, index);
186 return -EINVAL;
187 }
188 action = parm->v_action;
189
190 if (!exists) {
191 ret = tcf_idr_create(tn, index, est, a,
192 &act_vlan_ops, bind, true);
193 if (ret) {
194 tcf_idr_cleanup(tn, index);
195 return ret;
196 }
197
198 ret = ACT_P_CREATED;
199 } else if (!ovr) {
200 tcf_idr_release(*a, bind);
201 return -EEXIST;
202 }
203
204 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
205 if (err < 0)
206 goto release_idr;
207
208 v = to_vlan(*a);
209
210 p = kzalloc(sizeof(*p), GFP_KERNEL);
211 if (!p) {
212 err = -ENOMEM;
213 goto put_chain;
214 }
215
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;
220
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);
225
226 if (goto_ch)
227 tcf_chain_put_by_act(goto_ch);
228 if (p)
229 kfree_rcu(p, rcu);
230
231 if (ret == ACT_P_CREATED)
232 tcf_idr_insert(tn, *a);
233 return ret;
234put_chain:
235 if (goto_ch)
236 tcf_chain_put_by_act(goto_ch);
237release_idr:
238 tcf_idr_release(*a, bind);
239 return err;
240}
241
242static void tcf_vlan_cleanup(struct tc_action *a)
243{
244 struct tcf_vlan *v = to_vlan(a);
245 struct tcf_vlan_params *p;
246
247 p = rcu_dereference_protected(v->vlan_p, 1);
248 if (p)
249 kfree_rcu(p, rcu);
250}
251
252static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
253 int bind, int ref)
254{
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,
262 };
263 struct tcf_t t;
264
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;
271
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;
280
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);
285
286 return skb->len;
287
288nla_put_failure:
289 spin_unlock_bh(&v->tcf_lock);
290 nlmsg_trim(skb, b);
291 return -1;
292}
293
294static 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)
298{
299 struct tc_action_net *tn = net_generic(net, vlan_net_id);
300
301 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
302}
303
304static void tcf_vlan_stats_update(struct tc_action *a, u64 bytes, u32 packets,
305 u64 lastuse, bool hw)
306{
307 struct tcf_vlan *v = to_vlan(a);
308 struct tcf_t *tm = &v->tcf_tm;
309
310 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
311 if (hw)
312 _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
313 bytes, packets);
314 tm->lastuse = max_t(u64, tm->lastuse, lastuse);
315}
316
317static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index)
318{
319 struct tc_action_net *tn = net_generic(net, vlan_net_id);
320
321 return tcf_idr_search(tn, a, index);
322}
323
324static size_t tcf_vlan_get_fill_size(const struct tc_action *act)
325{
326 return nla_total_size(sizeof(struct tc_vlan))
327 + nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_ID */
328 + nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_PROTOCOL */
329 + nla_total_size(sizeof(u8)); /* TCA_VLAN_PUSH_VLAN_PRIORITY */
330}
331
332static struct tc_action_ops act_vlan_ops = {
333 .kind = "vlan",
334 .id = TCA_ID_VLAN,
335 .owner = THIS_MODULE,
336 .act = tcf_vlan_act,
337 .dump = tcf_vlan_dump,
338 .init = tcf_vlan_init,
339 .cleanup = tcf_vlan_cleanup,
340 .walk = tcf_vlan_walker,
341 .stats_update = tcf_vlan_stats_update,
342 .get_fill_size = tcf_vlan_get_fill_size,
343 .lookup = tcf_vlan_search,
344 .size = sizeof(struct tcf_vlan),
345};
346
347static __net_init int vlan_init_net(struct net *net)
348{
349 struct tc_action_net *tn = net_generic(net, vlan_net_id);
350
351 return tc_action_net_init(net, tn, &act_vlan_ops);
352}
353
354static void __net_exit vlan_exit_net(struct list_head *net_list)
355{
356 tc_action_net_exit(net_list, vlan_net_id);
357}
358
359static struct pernet_operations vlan_net_ops = {
360 .init = vlan_init_net,
361 .exit_batch = vlan_exit_net,
362 .id = &vlan_net_id,
363 .size = sizeof(struct tc_action_net),
364};
365
366static int __init vlan_init_module(void)
367{
368 return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
369}
370
371static void __exit vlan_cleanup_module(void)
372{
373 tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
374}
375
376module_init(vlan_init_module);
377module_exit(vlan_cleanup_module);
378
379MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
380MODULE_DESCRIPTION("vlan manipulation actions");
381MODULE_LICENSE("GPL v2");