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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
35
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
58 if (!skb_vlan_tagged(skb))
59 goto out;
60
61 if (skb_vlan_tag_present(skb)) {
62 tci = skb_vlan_tag_get(skb);
63 __vlan_hwaccel_clear_tag(skb);
64 } else {
65
66 err = __skb_vlan_pop(skb, &tci);
67 if (err)
68 goto drop;
69 }
70
71 tci = (tci & ~VLAN_VID_MASK) | p->tcfv_push_vid;
72
73 if (p->tcfv_push_prio) {
74 tci &= ~VLAN_PRIO_MASK;
75 tci |= p->tcfv_push_prio << VLAN_PRIO_SHIFT;
76 }
77
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 tcf_action_inc_drop_qstats(&v->common);
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, u32 flags,
106 struct netlink_ext_ack *extack)
107{
108 struct tc_action_net *tn = net_generic(net, vlan_net_id);
109 struct nlattr *tb[TCA_VLAN_MAX + 1];
110 struct tcf_chain *goto_ch = NULL;
111 struct tcf_vlan_params *p;
112 struct tc_vlan *parm;
113 struct tcf_vlan *v;
114 int action;
115 u16 push_vid = 0;
116 __be16 push_proto = 0;
117 u8 push_prio = 0;
118 bool exists = false;
119 int ret = 0, err;
120 u32 index;
121
122 if (!nla)
123 return -EINVAL;
124
125 err = nla_parse_nested_deprecated(tb, TCA_VLAN_MAX, nla, vlan_policy,
126 NULL);
127 if (err < 0)
128 return err;
129
130 if (!tb[TCA_VLAN_PARMS])
131 return -EINVAL;
132 parm = nla_data(tb[TCA_VLAN_PARMS]);
133 index = parm->index;
134 err = tcf_idr_check_alloc(tn, &index, a, bind);
135 if (err < 0)
136 return err;
137 exists = err;
138 if (exists && bind)
139 return 0;
140
141 switch (parm->v_action) {
142 case TCA_VLAN_ACT_POP:
143 break;
144 case TCA_VLAN_ACT_PUSH:
145 case TCA_VLAN_ACT_MODIFY:
146 if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
147 if (exists)
148 tcf_idr_release(*a, bind);
149 else
150 tcf_idr_cleanup(tn, index);
151 return -EINVAL;
152 }
153 push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
154 if (push_vid >= VLAN_VID_MASK) {
155 if (exists)
156 tcf_idr_release(*a, bind);
157 else
158 tcf_idr_cleanup(tn, index);
159 return -ERANGE;
160 }
161
162 if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
163 push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
164 switch (push_proto) {
165 case htons(ETH_P_8021Q):
166 case htons(ETH_P_8021AD):
167 break;
168 default:
169 if (exists)
170 tcf_idr_release(*a, bind);
171 else
172 tcf_idr_cleanup(tn, index);
173 return -EPROTONOSUPPORT;
174 }
175 } else {
176 push_proto = htons(ETH_P_8021Q);
177 }
178
179 if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY])
180 push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
181 break;
182 default:
183 if (exists)
184 tcf_idr_release(*a, bind);
185 else
186 tcf_idr_cleanup(tn, index);
187 return -EINVAL;
188 }
189 action = parm->v_action;
190
191 if (!exists) {
192 ret = tcf_idr_create_from_flags(tn, index, est, a,
193 &act_vlan_ops, bind, flags);
194 if (ret) {
195 tcf_idr_cleanup(tn, index);
196 return ret;
197 }
198
199 ret = ACT_P_CREATED;
200 } else if (!ovr) {
201 tcf_idr_release(*a, bind);
202 return -EEXIST;
203 }
204
205 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
206 if (err < 0)
207 goto release_idr;
208
209 v = to_vlan(*a);
210
211 p = kzalloc(sizeof(*p), GFP_KERNEL);
212 if (!p) {
213 err = -ENOMEM;
214 goto put_chain;
215 }
216
217 p->tcfv_action = action;
218 p->tcfv_push_vid = push_vid;
219 p->tcfv_push_prio = push_prio;
220 p->tcfv_push_proto = push_proto;
221
222 spin_lock_bh(&v->tcf_lock);
223 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
224 p = rcu_replace_pointer(v->vlan_p, p, lockdep_is_held(&v->tcf_lock));
225 spin_unlock_bh(&v->tcf_lock);
226
227 if (goto_ch)
228 tcf_chain_put_by_act(goto_ch);
229 if (p)
230 kfree_rcu(p, rcu);
231
232 if (ret == ACT_P_CREATED)
233 tcf_idr_insert(tn, *a);
234 return ret;
235put_chain:
236 if (goto_ch)
237 tcf_chain_put_by_act(goto_ch);
238release_idr:
239 tcf_idr_release(*a, bind);
240 return err;
241}
242
243static void tcf_vlan_cleanup(struct tc_action *a)
244{
245 struct tcf_vlan *v = to_vlan(a);
246 struct tcf_vlan_params *p;
247
248 p = rcu_dereference_protected(v->vlan_p, 1);
249 if (p)
250 kfree_rcu(p, rcu);
251}
252
253static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
254 int bind, int ref)
255{
256 unsigned char *b = skb_tail_pointer(skb);
257 struct tcf_vlan *v = to_vlan(a);
258 struct tcf_vlan_params *p;
259 struct tc_vlan opt = {
260 .index = v->tcf_index,
261 .refcnt = refcount_read(&v->tcf_refcnt) - ref,
262 .bindcnt = atomic_read(&v->tcf_bindcnt) - bind,
263 };
264 struct tcf_t t;
265
266 spin_lock_bh(&v->tcf_lock);
267 opt.action = v->tcf_action;
268 p = rcu_dereference_protected(v->vlan_p, lockdep_is_held(&v->tcf_lock));
269 opt.v_action = p->tcfv_action;
270 if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
271 goto nla_put_failure;
272
273 if ((p->tcfv_action == TCA_VLAN_ACT_PUSH ||
274 p->tcfv_action == TCA_VLAN_ACT_MODIFY) &&
275 (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, p->tcfv_push_vid) ||
276 nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
277 p->tcfv_push_proto) ||
278 (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY,
279 p->tcfv_push_prio))))
280 goto nla_put_failure;
281
282 tcf_tm_dump(&t, &v->tcf_tm);
283 if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
284 goto nla_put_failure;
285 spin_unlock_bh(&v->tcf_lock);
286
287 return skb->len;
288
289nla_put_failure:
290 spin_unlock_bh(&v->tcf_lock);
291 nlmsg_trim(skb, b);
292 return -1;
293}
294
295static int tcf_vlan_walker(struct net *net, struct sk_buff *skb,
296 struct netlink_callback *cb, int type,
297 const struct tc_action_ops *ops,
298 struct netlink_ext_ack *extack)
299{
300 struct tc_action_net *tn = net_generic(net, vlan_net_id);
301
302 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
303}
304
305static void tcf_vlan_stats_update(struct tc_action *a, u64 bytes, u32 packets,
306 u64 lastuse, bool hw)
307{
308 struct tcf_vlan *v = to_vlan(a);
309 struct tcf_t *tm = &v->tcf_tm;
310
311 tcf_action_update_stats(a, bytes, packets, false, hw);
312 tm->lastuse = max_t(u64, tm->lastuse, lastuse);
313}
314
315static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index)
316{
317 struct tc_action_net *tn = net_generic(net, vlan_net_id);
318
319 return tcf_idr_search(tn, a, index);
320}
321
322static size_t tcf_vlan_get_fill_size(const struct tc_action *act)
323{
324 return nla_total_size(sizeof(struct tc_vlan))
325 + nla_total_size(sizeof(u16))
326 + nla_total_size(sizeof(u16))
327 + nla_total_size(sizeof(u8));
328}
329
330static struct tc_action_ops act_vlan_ops = {
331 .kind = "vlan",
332 .id = TCA_ID_VLAN,
333 .owner = THIS_MODULE,
334 .act = tcf_vlan_act,
335 .dump = tcf_vlan_dump,
336 .init = tcf_vlan_init,
337 .cleanup = tcf_vlan_cleanup,
338 .walk = tcf_vlan_walker,
339 .stats_update = tcf_vlan_stats_update,
340 .get_fill_size = tcf_vlan_get_fill_size,
341 .lookup = tcf_vlan_search,
342 .size = sizeof(struct tcf_vlan),
343};
344
345static __net_init int vlan_init_net(struct net *net)
346{
347 struct tc_action_net *tn = net_generic(net, vlan_net_id);
348
349 return tc_action_net_init(net, tn, &act_vlan_ops);
350}
351
352static void __net_exit vlan_exit_net(struct list_head *net_list)
353{
354 tc_action_net_exit(net_list, vlan_net_id);
355}
356
357static struct pernet_operations vlan_net_ops = {
358 .init = vlan_init_net,
359 .exit_batch = vlan_exit_net,
360 .id = &vlan_net_id,
361 .size = sizeof(struct tc_action_net),
362};
363
364static int __init vlan_init_module(void)
365{
366 return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
367}
368
369static void __exit vlan_cleanup_module(void)
370{
371 tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
372}
373
374module_init(vlan_init_module);
375module_exit(vlan_cleanup_module);
376
377MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
378MODULE_DESCRIPTION("vlan manipulation actions");
379MODULE_LICENSE("GPL v2");
380
