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 #include <net/tc_wrapper.h>
16
17 #include <linux/tc_act/tc_vlan.h>
18 #include <net/tc_act/tc_vlan.h>
19
20 static struct tc_action_ops act_vlan_ops;
21
22 TC_INDIRECT_SCOPE int tcf_vlan_act(struct sk_buff *skb,
23 const struct tc_action *a,
24 struct tcf_result *res)
25 {
26 struct tcf_vlan *v = to_vlan(a);
27 struct tcf_vlan_params *p;
28 int action;
29 int err;
30 u16 tci;
31
32 tcf_lastuse_update(&v->tcf_tm);
33 tcf_action_update_bstats(&v->common, skb);
34
35 /* Ensure 'data' points at mac_header prior calling vlan manipulating
36 * functions.
37 */
38 if (skb_at_tc_ingress(skb))
39 skb_push_rcsum(skb, skb->mac_len);
40
41 action = READ_ONCE(v->tcf_action);
42
43 p = rcu_dereference_bh(v->vlan_p);
44
45 switch (p->tcfv_action) {
46 case TCA_VLAN_ACT_POP:
47 err = skb_vlan_pop(skb);
48 if (err)
49 goto drop;
50 break;
51 case TCA_VLAN_ACT_PUSH:
52 err = skb_vlan_push(skb, p->tcfv_push_proto, p->tcfv_push_vid |
53 (p->tcfv_push_prio << VLAN_PRIO_SHIFT));
54 if (err)
55 goto drop;
56 break;
57 case TCA_VLAN_ACT_MODIFY:
58 /* No-op if no vlan tag (either hw-accel or in-payload) */
59 if (!skb_vlan_tagged(skb))
60 goto out;
61 /* extract existing tag (and guarantee no hw-accel tag) */
62 if (skb_vlan_tag_present(skb)) {
63 tci = skb_vlan_tag_get(skb);
64 __vlan_hwaccel_clear_tag(skb);
65 } else {
66 /* in-payload vlan tag, pop it */
67 err = __skb_vlan_pop(skb, &tci);
68 if (err)
69 goto drop;
70 }
71 /* replace the vid */
72 tci = (tci & ~VLAN_VID_MASK) | p->tcfv_push_vid;
73 /* replace prio bits, if tcfv_push_prio specified */
74 if (p->tcfv_push_prio_exists) {
75 tci &= ~VLAN_PRIO_MASK;
76 tci |= p->tcfv_push_prio << VLAN_PRIO_SHIFT;
77 }
78 /* put updated tci as hwaccel tag */
79 __vlan_hwaccel_put_tag(skb, p->tcfv_push_proto, tci);
80 break;
81 case TCA_VLAN_ACT_POP_ETH:
82 err = skb_eth_pop(skb);
83 if (err)
84 goto drop;
85 break;
86 case TCA_VLAN_ACT_PUSH_ETH:
87 err = skb_eth_push(skb, p->tcfv_push_dst, p->tcfv_push_src);
88 if (err)
89 goto drop;
90 break;
91 default:
92 BUG();
93 }
94
95 out:
96 if (skb_at_tc_ingress(skb))
97 skb_pull_rcsum(skb, skb->mac_len);
98
99 return action;
100
101 drop:
102 tcf_action_inc_drop_qstats(&v->common);
103 return TC_ACT_SHOT;
104 }
105
106 static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
107 [TCA_VLAN_UNSPEC] = { .strict_start_type = TCA_VLAN_PUSH_ETH_DST },
108 [TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) },
109 [TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 },
110 [TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 },
111 [TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 },
112 [TCA_VLAN_PUSH_ETH_DST] = NLA_POLICY_ETH_ADDR,
113 [TCA_VLAN_PUSH_ETH_SRC] = NLA_POLICY_ETH_ADDR,
114 };
115
116 static int tcf_vlan_init(struct net *net, struct nlattr *nla,
117 struct nlattr *est, struct tc_action **a,
118 struct tcf_proto *tp, u32 flags,
119 struct netlink_ext_ack *extack)
120 {
121 struct tc_action_net *tn = net_generic(net, act_vlan_ops.net_id);
122 bool bind = flags & TCA_ACT_FLAGS_BIND;
123 struct nlattr *tb[TCA_VLAN_MAX + 1];
124 struct tcf_chain *goto_ch = NULL;
125 bool push_prio_exists = false;
126 struct tcf_vlan_params *p;
127 struct tc_vlan *parm;
128 struct tcf_vlan *v;
129 int action;
130 u16 push_vid = 0;
131 __be16 push_proto = 0;
132 u8 push_prio = 0;
133 bool exists = false;
134 int ret = 0, err;
135 u32 index;
136
137 if (!nla)
138 return -EINVAL;
139
140 err = nla_parse_nested_deprecated(tb, TCA_VLAN_MAX, nla, vlan_policy,
141 NULL);
142 if (err < 0)
143 return err;
144
145 if (!tb[TCA_VLAN_PARMS])
146 return -EINVAL;
147 parm = nla_data(tb[TCA_VLAN_PARMS]);
148 index = parm->index;
149 err = tcf_idr_check_alloc(tn, &index, a, bind);
150 if (err < 0)
151 return err;
152 exists = err;
153 if (exists && bind)
154 return ACT_P_BOUND;
155
156 switch (parm->v_action) {
157 case TCA_VLAN_ACT_POP:
158 break;
159 case TCA_VLAN_ACT_PUSH:
160 case TCA_VLAN_ACT_MODIFY:
161 if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
162 if (exists)
163 tcf_idr_release(*a, bind);
164 else
165 tcf_idr_cleanup(tn, index);
166 return -EINVAL;
167 }
168 push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
169 if (push_vid >= VLAN_VID_MASK) {
170 if (exists)
171 tcf_idr_release(*a, bind);
172 else
173 tcf_idr_cleanup(tn, index);
174 return -ERANGE;
175 }
176
177 if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
178 push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
179 switch (push_proto) {
180 case htons(ETH_P_8021Q):
181 case htons(ETH_P_8021AD):
182 break;
183 default:
184 if (exists)
185 tcf_idr_release(*a, bind);
186 else
187 tcf_idr_cleanup(tn, index);
188 return -EPROTONOSUPPORT;
189 }
190 } else {
191 push_proto = htons(ETH_P_8021Q);
192 }
193
194 push_prio_exists = !!tb[TCA_VLAN_PUSH_VLAN_PRIORITY];
195 if (push_prio_exists)
196 push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
197 break;
198 case TCA_VLAN_ACT_POP_ETH:
199 break;
200 case TCA_VLAN_ACT_PUSH_ETH:
201 if (!tb[TCA_VLAN_PUSH_ETH_DST] || !tb[TCA_VLAN_PUSH_ETH_SRC]) {
202 if (exists)
203 tcf_idr_release(*a, bind);
204 else
205 tcf_idr_cleanup(tn, index);
206 return -EINVAL;
207 }
208 break;
209 default:
210 if (exists)
211 tcf_idr_release(*a, bind);
212 else
213 tcf_idr_cleanup(tn, index);
214 return -EINVAL;
215 }
216 action = parm->v_action;
217
218 if (!exists) {
219 ret = tcf_idr_create_from_flags(tn, index, est, a,
220 &act_vlan_ops, bind, flags);
221 if (ret) {
222 tcf_idr_cleanup(tn, index);
223 return ret;
224 }
225
226 ret = ACT_P_CREATED;
227 } else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
228 tcf_idr_release(*a, bind);
229 return -EEXIST;
230 }
231
232 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
233 if (err < 0)
234 goto release_idr;
235
236 v = to_vlan(*a);
237
238 p = kzalloc(sizeof(*p), GFP_KERNEL);
239 if (!p) {
240 err = -ENOMEM;
241 goto put_chain;
242 }
243
244 p->tcfv_action = action;
245 p->tcfv_push_vid = push_vid;
246 p->tcfv_push_prio = push_prio;
247 p->tcfv_push_prio_exists = push_prio_exists || action == TCA_VLAN_ACT_PUSH;
248 p->tcfv_push_proto = push_proto;
249
250 if (action == TCA_VLAN_ACT_PUSH_ETH) {
251 nla_memcpy(&p->tcfv_push_dst, tb[TCA_VLAN_PUSH_ETH_DST],
252 ETH_ALEN);
253 nla_memcpy(&p->tcfv_push_src, tb[TCA_VLAN_PUSH_ETH_SRC],
254 ETH_ALEN);
255 }
256
257 spin_lock_bh(&v->tcf_lock);
258 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
259 p = rcu_replace_pointer(v->vlan_p, p, lockdep_is_held(&v->tcf_lock));
260 spin_unlock_bh(&v->tcf_lock);
261
262 if (goto_ch)
263 tcf_chain_put_by_act(goto_ch);
264 if (p)
265 kfree_rcu(p, rcu);
266
267 return ret;
268 put_chain:
269 if (goto_ch)
270 tcf_chain_put_by_act(goto_ch);
271 release_idr:
272 tcf_idr_release(*a, bind);
273 return err;
274 }
275
276 static void tcf_vlan_cleanup(struct tc_action *a)
277 {
278 struct tcf_vlan *v = to_vlan(a);
279 struct tcf_vlan_params *p;
280
281 p = rcu_dereference_protected(v->vlan_p, 1);
282 if (p)
283 kfree_rcu(p, rcu);
284 }
285
286 static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
287 int bind, int ref)
288 {
289 unsigned char *b = skb_tail_pointer(skb);
290 struct tcf_vlan *v = to_vlan(a);
291 struct tcf_vlan_params *p;
292 struct tc_vlan opt = {
293 .index = v->tcf_index,
294 .refcnt = refcount_read(&v->tcf_refcnt) - ref,
295 .bindcnt = atomic_read(&v->tcf_bindcnt) - bind,
296 };
297 struct tcf_t t;
298
299 spin_lock_bh(&v->tcf_lock);
300 opt.action = v->tcf_action;
301 p = rcu_dereference_protected(v->vlan_p, lockdep_is_held(&v->tcf_lock));
302 opt.v_action = p->tcfv_action;
303 if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
304 goto nla_put_failure;
305
306 if ((p->tcfv_action == TCA_VLAN_ACT_PUSH ||
307 p->tcfv_action == TCA_VLAN_ACT_MODIFY) &&
308 (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, p->tcfv_push_vid) ||
309 nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
310 p->tcfv_push_proto) ||
311 (p->tcfv_push_prio_exists &&
312 nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY, p->tcfv_push_prio))))
313 goto nla_put_failure;
314
315 if (p->tcfv_action == TCA_VLAN_ACT_PUSH_ETH) {
316 if (nla_put(skb, TCA_VLAN_PUSH_ETH_DST, ETH_ALEN,
317 p->tcfv_push_dst))
318 goto nla_put_failure;
319 if (nla_put(skb, TCA_VLAN_PUSH_ETH_SRC, ETH_ALEN,
320 p->tcfv_push_src))
321 goto nla_put_failure;
322 }
323
324 tcf_tm_dump(&t, &v->tcf_tm);
325 if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
326 goto nla_put_failure;
327 spin_unlock_bh(&v->tcf_lock);
328
329 return skb->len;
330
331 nla_put_failure:
332 spin_unlock_bh(&v->tcf_lock);
333 nlmsg_trim(skb, b);
334 return -1;
335 }
336
337 static void tcf_vlan_stats_update(struct tc_action *a, u64 bytes, u64 packets,
338 u64 drops, u64 lastuse, bool hw)
339 {
340 struct tcf_vlan *v = to_vlan(a);
341 struct tcf_t *tm = &v->tcf_tm;
342
343 tcf_action_update_stats(a, bytes, packets, drops, hw);
344 tm->lastuse = max_t(u64, tm->lastuse, lastuse);
345 }
346
347 static size_t tcf_vlan_get_fill_size(const struct tc_action *act)
348 {
349 return nla_total_size(sizeof(struct tc_vlan))
350 + nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_ID */
351 + nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_PROTOCOL */
352 + nla_total_size(sizeof(u8)); /* TCA_VLAN_PUSH_VLAN_PRIORITY */
353 }
354
355 static int tcf_vlan_offload_act_setup(struct tc_action *act, void *entry_data,
356 u32 *index_inc, bool bind,
357 struct netlink_ext_ack *extack)
358 {
359 if (bind) {
360 struct flow_action_entry *entry = entry_data;
361
362 switch (tcf_vlan_action(act)) {
363 case TCA_VLAN_ACT_PUSH:
364 entry->id = FLOW_ACTION_VLAN_PUSH;
365 entry->vlan.vid = tcf_vlan_push_vid(act);
366 entry->vlan.proto = tcf_vlan_push_proto(act);
367 entry->vlan.prio = tcf_vlan_push_prio(act);
368 break;
369 case TCA_VLAN_ACT_POP:
370 entry->id = FLOW_ACTION_VLAN_POP;
371 break;
372 case TCA_VLAN_ACT_MODIFY:
373 entry->id = FLOW_ACTION_VLAN_MANGLE;
374 entry->vlan.vid = tcf_vlan_push_vid(act);
375 entry->vlan.proto = tcf_vlan_push_proto(act);
376 entry->vlan.prio = tcf_vlan_push_prio(act);
377 break;
378 case TCA_VLAN_ACT_POP_ETH:
379 entry->id = FLOW_ACTION_VLAN_POP_ETH;
380 break;
381 case TCA_VLAN_ACT_PUSH_ETH:
382 entry->id = FLOW_ACTION_VLAN_PUSH_ETH;
383 tcf_vlan_push_eth(entry->vlan_push_eth.src, entry->vlan_push_eth.dst, act);
384 break;
385 default:
386 NL_SET_ERR_MSG_MOD(extack, "Unsupported vlan action mode offload");
387 return -EOPNOTSUPP;
388 }
389 *index_inc = 1;
390 } else {
391 struct flow_offload_action *fl_action = entry_data;
392
393 switch (tcf_vlan_action(act)) {
394 case TCA_VLAN_ACT_PUSH:
395 fl_action->id = FLOW_ACTION_VLAN_PUSH;
396 break;
397 case TCA_VLAN_ACT_POP:
398 fl_action->id = FLOW_ACTION_VLAN_POP;
399 break;
400 case TCA_VLAN_ACT_MODIFY:
401 fl_action->id = FLOW_ACTION_VLAN_MANGLE;
402 break;
403 case TCA_VLAN_ACT_POP_ETH:
404 fl_action->id = FLOW_ACTION_VLAN_POP_ETH;
405 break;
406 case TCA_VLAN_ACT_PUSH_ETH:
407 fl_action->id = FLOW_ACTION_VLAN_PUSH_ETH;
408 break;
409 default:
410 return -EOPNOTSUPP;
411 }
412 }
413
414 return 0;
415 }
416
417 static struct tc_action_ops act_vlan_ops = {
418 .kind = "vlan",
419 .id = TCA_ID_VLAN,
420 .owner = THIS_MODULE,
421 .act = tcf_vlan_act,
422 .dump = tcf_vlan_dump,
423 .init = tcf_vlan_init,
424 .cleanup = tcf_vlan_cleanup,
425 .stats_update = tcf_vlan_stats_update,
426 .get_fill_size = tcf_vlan_get_fill_size,
427 .offload_act_setup = tcf_vlan_offload_act_setup,
428 .size = sizeof(struct tcf_vlan),
429 };
430 MODULE_ALIAS_NET_ACT("vlan");
431
432 static __net_init int vlan_init_net(struct net *net)
433 {
434 struct tc_action_net *tn = net_generic(net, act_vlan_ops.net_id);
435
436 return tc_action_net_init(net, tn, &act_vlan_ops);
437 }
438
439 static void __net_exit vlan_exit_net(struct list_head *net_list)
440 {
441 tc_action_net_exit(net_list, act_vlan_ops.net_id);
442 }
443
444 static struct pernet_operations vlan_net_ops = {
445 .init = vlan_init_net,
446 .exit_batch = vlan_exit_net,
447 .id = &act_vlan_ops.net_id,
448 .size = sizeof(struct tc_action_net),
449 };
450
451 static int __init vlan_init_module(void)
452 {
453 return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
454 }
455
456 static void __exit vlan_cleanup_module(void)
457 {
458 tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
459 }
460
461 module_init(vlan_init_module);
462 module_exit(vlan_cleanup_module);
463
464 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
465 MODULE_DESCRIPTION("vlan manipulation actions");
466 MODULE_LICENSE("GPL v2");
467
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