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c7e2b968 JP |
1 | /* |
2 | * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/skbuff.h> | |
14 | #include <linux/rtnetlink.h> | |
15 | #include <linux/if_vlan.h> | |
16 | #include <net/netlink.h> | |
17 | #include <net/pkt_sched.h> | |
18 | ||
19 | #include <linux/tc_act/tc_vlan.h> | |
20 | #include <net/tc_act/tc_vlan.h> | |
21 | ||
c7d03a00 | 22 | static unsigned int vlan_net_id; |
a85a970a | 23 | static struct tc_action_ops act_vlan_ops; |
ddf97ccd | 24 | |
c7e2b968 JP |
25 | static int tcf_vlan(struct sk_buff *skb, const struct tc_action *a, |
26 | struct tcf_result *res) | |
27 | { | |
a85a970a | 28 | struct tcf_vlan *v = to_vlan(a); |
4c5b9d96 | 29 | struct tcf_vlan_params *p; |
c7e2b968 JP |
30 | int action; |
31 | int err; | |
45a497f2 | 32 | u16 tci; |
c7e2b968 | 33 | |
9c4a4e48 | 34 | tcf_lastuse_update(&v->tcf_tm); |
e0496cbb MK |
35 | bstats_cpu_update(this_cpu_ptr(v->common.cpu_bstats), skb); |
36 | ||
f39acc84 SL |
37 | /* Ensure 'data' points at mac_header prior calling vlan manipulating |
38 | * functions. | |
39 | */ | |
40 | if (skb_at_tc_ingress(skb)) | |
41 | skb_push_rcsum(skb, skb->mac_len); | |
42 | ||
4c5b9d96 MK |
43 | rcu_read_lock(); |
44 | ||
45 | action = READ_ONCE(v->tcf_action); | |
46 | ||
47 | p = rcu_dereference(v->vlan_p); | |
48 | ||
49 | switch (p->tcfv_action) { | |
c7e2b968 JP |
50 | case TCA_VLAN_ACT_POP: |
51 | err = skb_vlan_pop(skb); | |
52 | if (err) | |
53 | goto drop; | |
54 | break; | |
55 | case TCA_VLAN_ACT_PUSH: | |
4c5b9d96 MK |
56 | err = skb_vlan_push(skb, p->tcfv_push_proto, p->tcfv_push_vid | |
57 | (p->tcfv_push_prio << VLAN_PRIO_SHIFT)); | |
c7e2b968 JP |
58 | if (err) |
59 | goto drop; | |
60 | break; | |
45a497f2 SL |
61 | case TCA_VLAN_ACT_MODIFY: |
62 | /* No-op if no vlan tag (either hw-accel or in-payload) */ | |
63 | if (!skb_vlan_tagged(skb)) | |
64 | goto unlock; | |
65 | /* extract existing tag (and guarantee no hw-accel tag) */ | |
66 | if (skb_vlan_tag_present(skb)) { | |
67 | tci = skb_vlan_tag_get(skb); | |
68 | skb->vlan_tci = 0; | |
69 | } else { | |
70 | /* in-payload vlan tag, pop it */ | |
71 | err = __skb_vlan_pop(skb, &tci); | |
72 | if (err) | |
73 | goto drop; | |
74 | } | |
75 | /* replace the vid */ | |
4c5b9d96 | 76 | tci = (tci & ~VLAN_VID_MASK) | p->tcfv_push_vid; |
45a497f2 | 77 | /* replace prio bits, if tcfv_push_prio specified */ |
4c5b9d96 | 78 | if (p->tcfv_push_prio) { |
45a497f2 | 79 | tci &= ~VLAN_PRIO_MASK; |
4c5b9d96 | 80 | tci |= p->tcfv_push_prio << VLAN_PRIO_SHIFT; |
45a497f2 SL |
81 | } |
82 | /* put updated tci as hwaccel tag */ | |
4c5b9d96 | 83 | __vlan_hwaccel_put_tag(skb, p->tcfv_push_proto, tci); |
45a497f2 | 84 | break; |
c7e2b968 JP |
85 | default: |
86 | BUG(); | |
87 | } | |
88 | ||
89 | goto unlock; | |
90 | ||
91 | drop: | |
92 | action = TC_ACT_SHOT; | |
e0496cbb MK |
93 | qstats_drop_inc(this_cpu_ptr(v->common.cpu_qstats)); |
94 | ||
c7e2b968 | 95 | unlock: |
4c5b9d96 | 96 | rcu_read_unlock(); |
f39acc84 SL |
97 | if (skb_at_tc_ingress(skb)) |
98 | skb_pull_rcsum(skb, skb->mac_len); | |
99 | ||
c7e2b968 JP |
100 | return action; |
101 | } | |
102 | ||
103 | static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = { | |
104 | [TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) }, | |
105 | [TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 }, | |
106 | [TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 }, | |
956af371 | 107 | [TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 }, |
c7e2b968 JP |
108 | }; |
109 | ||
110 | static int tcf_vlan_init(struct net *net, struct nlattr *nla, | |
a85a970a | 111 | struct nlattr *est, struct tc_action **a, |
c7e2b968 JP |
112 | int ovr, int bind) |
113 | { | |
ddf97ccd | 114 | struct tc_action_net *tn = net_generic(net, vlan_net_id); |
c7e2b968 | 115 | struct nlattr *tb[TCA_VLAN_MAX + 1]; |
4c5b9d96 | 116 | struct tcf_vlan_params *p, *p_old; |
c7e2b968 JP |
117 | struct tc_vlan *parm; |
118 | struct tcf_vlan *v; | |
119 | int action; | |
120 | __be16 push_vid = 0; | |
121 | __be16 push_proto = 0; | |
956af371 | 122 | u8 push_prio = 0; |
b2313077 WC |
123 | bool exists = false; |
124 | int ret = 0, err; | |
c7e2b968 JP |
125 | |
126 | if (!nla) | |
127 | return -EINVAL; | |
128 | ||
fceb6435 | 129 | err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy, NULL); |
c7e2b968 JP |
130 | if (err < 0) |
131 | return err; | |
132 | ||
133 | if (!tb[TCA_VLAN_PARMS]) | |
134 | return -EINVAL; | |
135 | parm = nla_data(tb[TCA_VLAN_PARMS]); | |
65a206c0 | 136 | exists = tcf_idr_check(tn, parm->index, a, bind); |
5026c9b1 JHS |
137 | if (exists && bind) |
138 | return 0; | |
139 | ||
c7e2b968 JP |
140 | switch (parm->v_action) { |
141 | case TCA_VLAN_ACT_POP: | |
142 | break; | |
143 | case TCA_VLAN_ACT_PUSH: | |
45a497f2 | 144 | case TCA_VLAN_ACT_MODIFY: |
5026c9b1 JHS |
145 | if (!tb[TCA_VLAN_PUSH_VLAN_ID]) { |
146 | if (exists) | |
65a206c0 | 147 | tcf_idr_release(*a, bind); |
c7e2b968 | 148 | return -EINVAL; |
5026c9b1 | 149 | } |
c7e2b968 | 150 | push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]); |
5026c9b1 JHS |
151 | if (push_vid >= VLAN_VID_MASK) { |
152 | if (exists) | |
65a206c0 | 153 | tcf_idr_release(*a, bind); |
c7e2b968 | 154 | return -ERANGE; |
5026c9b1 | 155 | } |
c7e2b968 JP |
156 | |
157 | if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) { | |
158 | push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]); | |
159 | switch (push_proto) { | |
160 | case htons(ETH_P_8021Q): | |
161 | case htons(ETH_P_8021AD): | |
162 | break; | |
163 | default: | |
513d982d DC |
164 | if (exists) |
165 | tcf_idr_release(*a, bind); | |
c7e2b968 JP |
166 | return -EPROTONOSUPPORT; |
167 | } | |
168 | } else { | |
169 | push_proto = htons(ETH_P_8021Q); | |
170 | } | |
956af371 HHZ |
171 | |
172 | if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY]) | |
173 | push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]); | |
c7e2b968 JP |
174 | break; |
175 | default: | |
5026c9b1 | 176 | if (exists) |
65a206c0 | 177 | tcf_idr_release(*a, bind); |
c7e2b968 JP |
178 | return -EINVAL; |
179 | } | |
180 | action = parm->v_action; | |
181 | ||
5026c9b1 | 182 | if (!exists) { |
65a206c0 | 183 | ret = tcf_idr_create(tn, parm->index, est, a, |
e0496cbb | 184 | &act_vlan_ops, bind, true); |
c7e2b968 JP |
185 | if (ret) |
186 | return ret; | |
187 | ||
188 | ret = ACT_P_CREATED; | |
189 | } else { | |
65a206c0 | 190 | tcf_idr_release(*a, bind); |
c7e2b968 JP |
191 | if (!ovr) |
192 | return -EEXIST; | |
193 | } | |
194 | ||
a85a970a | 195 | v = to_vlan(*a); |
c7e2b968 | 196 | |
4c5b9d96 MK |
197 | ASSERT_RTNL(); |
198 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
199 | if (!p) { | |
200 | if (ovr) | |
201 | tcf_idr_release(*a, bind); | |
202 | return -ENOMEM; | |
203 | } | |
c7e2b968 JP |
204 | |
205 | v->tcf_action = parm->action; | |
206 | ||
4c5b9d96 MK |
207 | p_old = rtnl_dereference(v->vlan_p); |
208 | ||
209 | p->tcfv_action = action; | |
210 | p->tcfv_push_vid = push_vid; | |
211 | p->tcfv_push_prio = push_prio; | |
212 | p->tcfv_push_proto = push_proto; | |
213 | ||
214 | rcu_assign_pointer(v->vlan_p, p); | |
215 | ||
216 | if (p_old) | |
217 | kfree_rcu(p_old, rcu); | |
c7e2b968 JP |
218 | |
219 | if (ret == ACT_P_CREATED) | |
65a206c0 | 220 | tcf_idr_insert(tn, *a); |
c7e2b968 JP |
221 | return ret; |
222 | } | |
223 | ||
4c5b9d96 MK |
224 | static void tcf_vlan_cleanup(struct tc_action *a, int bind) |
225 | { | |
226 | struct tcf_vlan *v = to_vlan(a); | |
227 | struct tcf_vlan_params *p; | |
228 | ||
229 | p = rcu_dereference_protected(v->vlan_p, 1); | |
1ca3c627 DC |
230 | if (p) |
231 | kfree_rcu(p, rcu); | |
4c5b9d96 MK |
232 | } |
233 | ||
c7e2b968 JP |
234 | static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a, |
235 | int bind, int ref) | |
236 | { | |
237 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 238 | struct tcf_vlan *v = to_vlan(a); |
4c5b9d96 | 239 | struct tcf_vlan_params *p = rtnl_dereference(v->vlan_p); |
c7e2b968 JP |
240 | struct tc_vlan opt = { |
241 | .index = v->tcf_index, | |
242 | .refcnt = v->tcf_refcnt - ref, | |
243 | .bindcnt = v->tcf_bindcnt - bind, | |
244 | .action = v->tcf_action, | |
4c5b9d96 | 245 | .v_action = p->tcfv_action, |
c7e2b968 JP |
246 | }; |
247 | struct tcf_t t; | |
248 | ||
249 | if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt)) | |
250 | goto nla_put_failure; | |
251 | ||
4c5b9d96 MK |
252 | if ((p->tcfv_action == TCA_VLAN_ACT_PUSH || |
253 | p->tcfv_action == TCA_VLAN_ACT_MODIFY) && | |
254 | (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, p->tcfv_push_vid) || | |
0b0f43fe | 255 | nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL, |
4c5b9d96 | 256 | p->tcfv_push_proto) || |
956af371 | 257 | (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY, |
4c5b9d96 | 258 | p->tcfv_push_prio)))) |
c7e2b968 JP |
259 | goto nla_put_failure; |
260 | ||
48d8ee16 | 261 | tcf_tm_dump(&t, &v->tcf_tm); |
9854518e | 262 | if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD)) |
c7e2b968 JP |
263 | goto nla_put_failure; |
264 | return skb->len; | |
265 | ||
266 | nla_put_failure: | |
267 | nlmsg_trim(skb, b); | |
268 | return -1; | |
269 | } | |
270 | ||
ddf97ccd WC |
271 | static int tcf_vlan_walker(struct net *net, struct sk_buff *skb, |
272 | struct netlink_callback *cb, int type, | |
a85a970a | 273 | const struct tc_action_ops *ops) |
ddf97ccd WC |
274 | { |
275 | struct tc_action_net *tn = net_generic(net, vlan_net_id); | |
276 | ||
a85a970a | 277 | return tcf_generic_walker(tn, skb, cb, type, ops); |
ddf97ccd WC |
278 | } |
279 | ||
a85a970a | 280 | static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
281 | { |
282 | struct tc_action_net *tn = net_generic(net, vlan_net_id); | |
283 | ||
65a206c0 | 284 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
285 | } |
286 | ||
c7e2b968 JP |
287 | static struct tc_action_ops act_vlan_ops = { |
288 | .kind = "vlan", | |
289 | .type = TCA_ACT_VLAN, | |
290 | .owner = THIS_MODULE, | |
291 | .act = tcf_vlan, | |
292 | .dump = tcf_vlan_dump, | |
293 | .init = tcf_vlan_init, | |
4c5b9d96 | 294 | .cleanup = tcf_vlan_cleanup, |
ddf97ccd WC |
295 | .walk = tcf_vlan_walker, |
296 | .lookup = tcf_vlan_search, | |
a85a970a | 297 | .size = sizeof(struct tcf_vlan), |
ddf97ccd WC |
298 | }; |
299 | ||
300 | static __net_init int vlan_init_net(struct net *net) | |
301 | { | |
302 | struct tc_action_net *tn = net_generic(net, vlan_net_id); | |
303 | ||
c7e460ce | 304 | return tc_action_net_init(tn, &act_vlan_ops); |
ddf97ccd WC |
305 | } |
306 | ||
307 | static void __net_exit vlan_exit_net(struct net *net) | |
308 | { | |
309 | struct tc_action_net *tn = net_generic(net, vlan_net_id); | |
310 | ||
311 | tc_action_net_exit(tn); | |
312 | } | |
313 | ||
314 | static struct pernet_operations vlan_net_ops = { | |
315 | .init = vlan_init_net, | |
316 | .exit = vlan_exit_net, | |
317 | .id = &vlan_net_id, | |
318 | .size = sizeof(struct tc_action_net), | |
c7e2b968 JP |
319 | }; |
320 | ||
321 | static int __init vlan_init_module(void) | |
322 | { | |
ddf97ccd | 323 | return tcf_register_action(&act_vlan_ops, &vlan_net_ops); |
c7e2b968 JP |
324 | } |
325 | ||
326 | static void __exit vlan_cleanup_module(void) | |
327 | { | |
ddf97ccd | 328 | tcf_unregister_action(&act_vlan_ops, &vlan_net_ops); |
c7e2b968 JP |
329 | } |
330 | ||
331 | module_init(vlan_init_module); | |
332 | module_exit(vlan_cleanup_module); | |
333 | ||
334 | MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>"); | |
335 | MODULE_DESCRIPTION("vlan manipulation actions"); | |
336 | MODULE_LICENSE("GPL v2"); |