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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 tcf_action_update_bstats(&v->common, 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_exists) {
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 case TCA_VLAN_ACT_POP_ETH:
81 err = skb_eth_pop(skb);
82 if (err)
83 goto drop;
84 break;
85 case TCA_VLAN_ACT_PUSH_ETH:
86 err = skb_eth_push(skb, p->tcfv_push_dst, p->tcfv_push_src);
87 if (err)
88 goto drop;
89 break;
90 default:
91 BUG();
92 }
93
94out:
95 if (skb_at_tc_ingress(skb))
96 skb_pull_rcsum(skb, skb->mac_len);
97
98 return action;
99
100drop:
101 tcf_action_inc_drop_qstats(&v->common);
102 return TC_ACT_SHOT;
103}
104
105static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
106 [TCA_VLAN_UNSPEC] = { .strict_start_type = TCA_VLAN_PUSH_ETH_DST },
107 [TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) },
108 [TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 },
109 [TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 },
110 [TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 },
111 [TCA_VLAN_PUSH_ETH_DST] = NLA_POLICY_ETH_ADDR,
112 [TCA_VLAN_PUSH_ETH_SRC] = NLA_POLICY_ETH_ADDR,
113};
114
115static int tcf_vlan_init(struct net *net, struct nlattr *nla,
116 struct nlattr *est, struct tc_action **a,
117 int ovr, int bind, bool rtnl_held,
118 struct tcf_proto *tp, u32 flags,
119 struct netlink_ext_ack *extack)
120{
121 struct tc_action_net *tn = net_generic(net, vlan_net_id);
122 struct nlattr *tb[TCA_VLAN_MAX + 1];
123 struct tcf_chain *goto_ch = NULL;
124 bool push_prio_exists = false;
125 struct tcf_vlan_params *p;
126 struct tc_vlan *parm;
127 struct tcf_vlan *v;
128 int action;
129 u16 push_vid = 0;
130 __be16 push_proto = 0;
131 u8 push_prio = 0;
132 bool exists = false;
133 int ret = 0, err;
134 u32 index;
135
136 if (!nla)
137 return -EINVAL;
138
139 err = nla_parse_nested_deprecated(tb, TCA_VLAN_MAX, nla, vlan_policy,
140 NULL);
141 if (err < 0)
142 return err;
143
144 if (!tb[TCA_VLAN_PARMS])
145 return -EINVAL;
146 parm = nla_data(tb[TCA_VLAN_PARMS]);
147 index = parm->index;
148 err = tcf_idr_check_alloc(tn, &index, a, bind);
149 if (err < 0)
150 return err;
151 exists = err;
152 if (exists && bind)
153 return 0;
154
155 switch (parm->v_action) {
156 case TCA_VLAN_ACT_POP:
157 break;
158 case TCA_VLAN_ACT_PUSH:
159 case TCA_VLAN_ACT_MODIFY:
160 if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
161 if (exists)
162 tcf_idr_release(*a, bind);
163 else
164 tcf_idr_cleanup(tn, index);
165 return -EINVAL;
166 }
167 push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
168 if (push_vid >= VLAN_VID_MASK) {
169 if (exists)
170 tcf_idr_release(*a, bind);
171 else
172 tcf_idr_cleanup(tn, index);
173 return -ERANGE;
174 }
175
176 if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
177 push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
178 switch (push_proto) {
179 case htons(ETH_P_8021Q):
180 case htons(ETH_P_8021AD):
181 break;
182 default:
183 if (exists)
184 tcf_idr_release(*a, bind);
185 else
186 tcf_idr_cleanup(tn, index);
187 return -EPROTONOSUPPORT;
188 }
189 } else {
190 push_proto = htons(ETH_P_8021Q);
191 }
192
193 push_prio_exists = !!tb[TCA_VLAN_PUSH_VLAN_PRIORITY];
194 if (push_prio_exists)
195 push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
196 break;
197 case TCA_VLAN_ACT_POP_ETH:
198 break;
199 case TCA_VLAN_ACT_PUSH_ETH:
200 if (!tb[TCA_VLAN_PUSH_ETH_DST] || !tb[TCA_VLAN_PUSH_ETH_SRC]) {
201 if (exists)
202 tcf_idr_release(*a, bind);
203 else
204 tcf_idr_cleanup(tn, index);
205 return -EINVAL;
206 }
207 break;
208 default:
209 if (exists)
210 tcf_idr_release(*a, bind);
211 else
212 tcf_idr_cleanup(tn, index);
213 return -EINVAL;
214 }
215 action = parm->v_action;
216
217 if (!exists) {
218 ret = tcf_idr_create_from_flags(tn, index, est, a,
219 &act_vlan_ops, bind, flags);
220 if (ret) {
221 tcf_idr_cleanup(tn, index);
222 return ret;
223 }
224
225 ret = ACT_P_CREATED;
226 } else if (!ovr) {
227 tcf_idr_release(*a, bind);
228 return -EEXIST;
229 }
230
231 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
232 if (err < 0)
233 goto release_idr;
234
235 v = to_vlan(*a);
236
237 p = kzalloc(sizeof(*p), GFP_KERNEL);
238 if (!p) {
239 err = -ENOMEM;
240 goto put_chain;
241 }
242
243 p->tcfv_action = action;
244 p->tcfv_push_vid = push_vid;
245 p->tcfv_push_prio = push_prio;
246 p->tcfv_push_prio_exists = push_prio_exists || action == TCA_VLAN_ACT_PUSH;
247 p->tcfv_push_proto = push_proto;
248
249 if (action == TCA_VLAN_ACT_PUSH_ETH) {
250 nla_memcpy(&p->tcfv_push_dst, tb[TCA_VLAN_PUSH_ETH_DST],
251 ETH_ALEN);
252 nla_memcpy(&p->tcfv_push_src, tb[TCA_VLAN_PUSH_ETH_SRC],
253 ETH_ALEN);
254 }
255
256 spin_lock_bh(&v->tcf_lock);
257 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
258 p = rcu_replace_pointer(v->vlan_p, p, lockdep_is_held(&v->tcf_lock));
259 spin_unlock_bh(&v->tcf_lock);
260
261 if (goto_ch)
262 tcf_chain_put_by_act(goto_ch);
263 if (p)
264 kfree_rcu(p, rcu);
265
266 return ret;
267put_chain:
268 if (goto_ch)
269 tcf_chain_put_by_act(goto_ch);
270release_idr:
271 tcf_idr_release(*a, bind);
272 return err;
273}
274
275static void tcf_vlan_cleanup(struct tc_action *a)
276{
277 struct tcf_vlan *v = to_vlan(a);
278 struct tcf_vlan_params *p;
279
280 p = rcu_dereference_protected(v->vlan_p, 1);
281 if (p)
282 kfree_rcu(p, rcu);
283}
284
285static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
286 int bind, int ref)
287{
288 unsigned char *b = skb_tail_pointer(skb);
289 struct tcf_vlan *v = to_vlan(a);
290 struct tcf_vlan_params *p;
291 struct tc_vlan opt = {
292 .index = v->tcf_index,
293 .refcnt = refcount_read(&v->tcf_refcnt) - ref,
294 .bindcnt = atomic_read(&v->tcf_bindcnt) - bind,
295 };
296 struct tcf_t t;
297
298 spin_lock_bh(&v->tcf_lock);
299 opt.action = v->tcf_action;
300 p = rcu_dereference_protected(v->vlan_p, lockdep_is_held(&v->tcf_lock));
301 opt.v_action = p->tcfv_action;
302 if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
303 goto nla_put_failure;
304
305 if ((p->tcfv_action == TCA_VLAN_ACT_PUSH ||
306 p->tcfv_action == TCA_VLAN_ACT_MODIFY) &&
307 (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, p->tcfv_push_vid) ||
308 nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
309 p->tcfv_push_proto) ||
310 (p->tcfv_push_prio_exists &&
311 nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY, p->tcfv_push_prio))))
312 goto nla_put_failure;
313
314 if (p->tcfv_action == TCA_VLAN_ACT_PUSH_ETH) {
315 if (nla_put(skb, TCA_VLAN_PUSH_ETH_DST, ETH_ALEN,
316 p->tcfv_push_dst))
317 goto nla_put_failure;
318 if (nla_put(skb, TCA_VLAN_PUSH_ETH_SRC, ETH_ALEN,
319 p->tcfv_push_src))
320 goto nla_put_failure;
321 }
322
323 tcf_tm_dump(&t, &v->tcf_tm);
324 if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
325 goto nla_put_failure;
326 spin_unlock_bh(&v->tcf_lock);
327
328 return skb->len;
329
330nla_put_failure:
331 spin_unlock_bh(&v->tcf_lock);
332 nlmsg_trim(skb, b);
333 return -1;
334}
335
336static int tcf_vlan_walker(struct net *net, struct sk_buff *skb,
337 struct netlink_callback *cb, int type,
338 const struct tc_action_ops *ops,
339 struct netlink_ext_ack *extack)
340{
341 struct tc_action_net *tn = net_generic(net, vlan_net_id);
342
343 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
344}
345
346static void tcf_vlan_stats_update(struct tc_action *a, u64 bytes, u64 packets,
347 u64 drops, u64 lastuse, bool hw)
348{
349 struct tcf_vlan *v = to_vlan(a);
350 struct tcf_t *tm = &v->tcf_tm;
351
352 tcf_action_update_stats(a, bytes, packets, drops, hw);
353 tm->lastuse = max_t(u64, tm->lastuse, lastuse);
354}
355
356static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index)
357{
358 struct tc_action_net *tn = net_generic(net, vlan_net_id);
359
360 return tcf_idr_search(tn, a, index);
361}
362
363static size_t tcf_vlan_get_fill_size(const struct tc_action *act)
364{
365 return nla_total_size(sizeof(struct tc_vlan))
366 + nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_ID */
367 + nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_PROTOCOL */
368 + nla_total_size(sizeof(u8)); /* TCA_VLAN_PUSH_VLAN_PRIORITY */
369}
370
371static struct tc_action_ops act_vlan_ops = {
372 .kind = "vlan",
373 .id = TCA_ID_VLAN,
374 .owner = THIS_MODULE,
375 .act = tcf_vlan_act,
376 .dump = tcf_vlan_dump,
377 .init = tcf_vlan_init,
378 .cleanup = tcf_vlan_cleanup,
379 .walk = tcf_vlan_walker,
380 .stats_update = tcf_vlan_stats_update,
381 .get_fill_size = tcf_vlan_get_fill_size,
382 .lookup = tcf_vlan_search,
383 .size = sizeof(struct tcf_vlan),
384};
385
386static __net_init int vlan_init_net(struct net *net)
387{
388 struct tc_action_net *tn = net_generic(net, vlan_net_id);
389
390 return tc_action_net_init(net, tn, &act_vlan_ops);
391}
392
393static void __net_exit vlan_exit_net(struct list_head *net_list)
394{
395 tc_action_net_exit(net_list, vlan_net_id);
396}
397
398static struct pernet_operations vlan_net_ops = {
399 .init = vlan_init_net,
400 .exit_batch = vlan_exit_net,
401 .id = &vlan_net_id,
402 .size = sizeof(struct tc_action_net),
403};
404
405static int __init vlan_init_module(void)
406{
407 return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
408}
409
410static void __exit vlan_cleanup_module(void)
411{
412 tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
413}
414
415module_init(vlan_init_module);
416module_exit(vlan_cleanup_module);
417
418MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
419MODULE_DESCRIPTION("vlan manipulation actions");
420MODULE_LICENSE("GPL v2");