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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 | ||
22 | #define VLAN_TAB_MASK 15 | |
23 | ||
ddf97ccd | 24 | static int vlan_net_id; |
a85a970a | 25 | static struct tc_action_ops act_vlan_ops; |
ddf97ccd | 26 | |
c7e2b968 JP |
27 | static int tcf_vlan(struct sk_buff *skb, const struct tc_action *a, |
28 | struct tcf_result *res) | |
29 | { | |
a85a970a | 30 | struct tcf_vlan *v = to_vlan(a); |
c7e2b968 JP |
31 | int action; |
32 | int err; | |
33 | ||
34 | spin_lock(&v->tcf_lock); | |
9c4a4e48 | 35 | tcf_lastuse_update(&v->tcf_tm); |
c7e2b968 JP |
36 | bstats_update(&v->tcf_bstats, skb); |
37 | action = v->tcf_action; | |
38 | ||
39 | switch (v->tcfv_action) { | |
40 | case TCA_VLAN_ACT_POP: | |
41 | err = skb_vlan_pop(skb); | |
42 | if (err) | |
43 | goto drop; | |
44 | break; | |
45 | case TCA_VLAN_ACT_PUSH: | |
956af371 HHZ |
46 | err = skb_vlan_push(skb, v->tcfv_push_proto, v->tcfv_push_vid | |
47 | (v->tcfv_push_prio << VLAN_PRIO_SHIFT)); | |
c7e2b968 JP |
48 | if (err) |
49 | goto drop; | |
50 | break; | |
51 | default: | |
52 | BUG(); | |
53 | } | |
54 | ||
55 | goto unlock; | |
56 | ||
57 | drop: | |
58 | action = TC_ACT_SHOT; | |
59 | v->tcf_qstats.drops++; | |
60 | unlock: | |
61 | spin_unlock(&v->tcf_lock); | |
62 | return action; | |
63 | } | |
64 | ||
65 | static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = { | |
66 | [TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) }, | |
67 | [TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 }, | |
68 | [TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 }, | |
956af371 | 69 | [TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 }, |
c7e2b968 JP |
70 | }; |
71 | ||
72 | static int tcf_vlan_init(struct net *net, struct nlattr *nla, | |
a85a970a | 73 | struct nlattr *est, struct tc_action **a, |
c7e2b968 JP |
74 | int ovr, int bind) |
75 | { | |
ddf97ccd | 76 | struct tc_action_net *tn = net_generic(net, vlan_net_id); |
c7e2b968 JP |
77 | struct nlattr *tb[TCA_VLAN_MAX + 1]; |
78 | struct tc_vlan *parm; | |
79 | struct tcf_vlan *v; | |
80 | int action; | |
81 | __be16 push_vid = 0; | |
82 | __be16 push_proto = 0; | |
956af371 | 83 | u8 push_prio = 0; |
b2313077 WC |
84 | bool exists = false; |
85 | int ret = 0, err; | |
c7e2b968 JP |
86 | |
87 | if (!nla) | |
88 | return -EINVAL; | |
89 | ||
90 | err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy); | |
91 | if (err < 0) | |
92 | return err; | |
93 | ||
94 | if (!tb[TCA_VLAN_PARMS]) | |
95 | return -EINVAL; | |
96 | parm = nla_data(tb[TCA_VLAN_PARMS]); | |
5026c9b1 JHS |
97 | exists = tcf_hash_check(tn, parm->index, a, bind); |
98 | if (exists && bind) | |
99 | return 0; | |
100 | ||
c7e2b968 JP |
101 | switch (parm->v_action) { |
102 | case TCA_VLAN_ACT_POP: | |
103 | break; | |
104 | case TCA_VLAN_ACT_PUSH: | |
5026c9b1 JHS |
105 | if (!tb[TCA_VLAN_PUSH_VLAN_ID]) { |
106 | if (exists) | |
a85a970a | 107 | tcf_hash_release(*a, bind); |
c7e2b968 | 108 | return -EINVAL; |
5026c9b1 | 109 | } |
c7e2b968 | 110 | push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]); |
5026c9b1 JHS |
111 | if (push_vid >= VLAN_VID_MASK) { |
112 | if (exists) | |
a85a970a | 113 | tcf_hash_release(*a, bind); |
c7e2b968 | 114 | return -ERANGE; |
5026c9b1 | 115 | } |
c7e2b968 JP |
116 | |
117 | if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) { | |
118 | push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]); | |
119 | switch (push_proto) { | |
120 | case htons(ETH_P_8021Q): | |
121 | case htons(ETH_P_8021AD): | |
122 | break; | |
123 | default: | |
124 | return -EPROTONOSUPPORT; | |
125 | } | |
126 | } else { | |
127 | push_proto = htons(ETH_P_8021Q); | |
128 | } | |
956af371 HHZ |
129 | |
130 | if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY]) | |
131 | push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]); | |
c7e2b968 JP |
132 | break; |
133 | default: | |
5026c9b1 | 134 | if (exists) |
a85a970a | 135 | tcf_hash_release(*a, bind); |
c7e2b968 JP |
136 | return -EINVAL; |
137 | } | |
138 | action = parm->v_action; | |
139 | ||
5026c9b1 | 140 | if (!exists) { |
ddf97ccd | 141 | ret = tcf_hash_create(tn, parm->index, est, a, |
a85a970a | 142 | &act_vlan_ops, bind, false); |
c7e2b968 JP |
143 | if (ret) |
144 | return ret; | |
145 | ||
146 | ret = ACT_P_CREATED; | |
147 | } else { | |
a85a970a | 148 | tcf_hash_release(*a, bind); |
c7e2b968 JP |
149 | if (!ovr) |
150 | return -EEXIST; | |
151 | } | |
152 | ||
a85a970a | 153 | v = to_vlan(*a); |
c7e2b968 JP |
154 | |
155 | spin_lock_bh(&v->tcf_lock); | |
156 | ||
157 | v->tcfv_action = action; | |
158 | v->tcfv_push_vid = push_vid; | |
956af371 | 159 | v->tcfv_push_prio = push_prio; |
c7e2b968 JP |
160 | v->tcfv_push_proto = push_proto; |
161 | ||
162 | v->tcf_action = parm->action; | |
163 | ||
164 | spin_unlock_bh(&v->tcf_lock); | |
165 | ||
166 | if (ret == ACT_P_CREATED) | |
a85a970a | 167 | tcf_hash_insert(tn, *a); |
c7e2b968 JP |
168 | return ret; |
169 | } | |
170 | ||
171 | static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a, | |
172 | int bind, int ref) | |
173 | { | |
174 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 175 | struct tcf_vlan *v = to_vlan(a); |
c7e2b968 JP |
176 | struct tc_vlan opt = { |
177 | .index = v->tcf_index, | |
178 | .refcnt = v->tcf_refcnt - ref, | |
179 | .bindcnt = v->tcf_bindcnt - bind, | |
180 | .action = v->tcf_action, | |
181 | .v_action = v->tcfv_action, | |
182 | }; | |
183 | struct tcf_t t; | |
184 | ||
185 | if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt)) | |
186 | goto nla_put_failure; | |
187 | ||
188 | if (v->tcfv_action == TCA_VLAN_ACT_PUSH && | |
189 | (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, v->tcfv_push_vid) || | |
0b0f43fe | 190 | nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL, |
956af371 HHZ |
191 | v->tcfv_push_proto) || |
192 | (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY, | |
193 | v->tcfv_push_prio)))) | |
c7e2b968 JP |
194 | goto nla_put_failure; |
195 | ||
48d8ee16 | 196 | tcf_tm_dump(&t, &v->tcf_tm); |
9854518e | 197 | if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD)) |
c7e2b968 JP |
198 | goto nla_put_failure; |
199 | return skb->len; | |
200 | ||
201 | nla_put_failure: | |
202 | nlmsg_trim(skb, b); | |
203 | return -1; | |
204 | } | |
205 | ||
ddf97ccd WC |
206 | static int tcf_vlan_walker(struct net *net, struct sk_buff *skb, |
207 | struct netlink_callback *cb, int type, | |
a85a970a | 208 | const struct tc_action_ops *ops) |
ddf97ccd WC |
209 | { |
210 | struct tc_action_net *tn = net_generic(net, vlan_net_id); | |
211 | ||
a85a970a | 212 | return tcf_generic_walker(tn, skb, cb, type, ops); |
ddf97ccd WC |
213 | } |
214 | ||
a85a970a | 215 | static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
216 | { |
217 | struct tc_action_net *tn = net_generic(net, vlan_net_id); | |
218 | ||
219 | return tcf_hash_search(tn, a, index); | |
220 | } | |
221 | ||
c7e2b968 JP |
222 | static struct tc_action_ops act_vlan_ops = { |
223 | .kind = "vlan", | |
224 | .type = TCA_ACT_VLAN, | |
225 | .owner = THIS_MODULE, | |
226 | .act = tcf_vlan, | |
227 | .dump = tcf_vlan_dump, | |
228 | .init = tcf_vlan_init, | |
ddf97ccd WC |
229 | .walk = tcf_vlan_walker, |
230 | .lookup = tcf_vlan_search, | |
a85a970a | 231 | .size = sizeof(struct tcf_vlan), |
ddf97ccd WC |
232 | }; |
233 | ||
234 | static __net_init int vlan_init_net(struct net *net) | |
235 | { | |
236 | struct tc_action_net *tn = net_generic(net, vlan_net_id); | |
237 | ||
238 | return tc_action_net_init(tn, &act_vlan_ops, VLAN_TAB_MASK); | |
239 | } | |
240 | ||
241 | static void __net_exit vlan_exit_net(struct net *net) | |
242 | { | |
243 | struct tc_action_net *tn = net_generic(net, vlan_net_id); | |
244 | ||
245 | tc_action_net_exit(tn); | |
246 | } | |
247 | ||
248 | static struct pernet_operations vlan_net_ops = { | |
249 | .init = vlan_init_net, | |
250 | .exit = vlan_exit_net, | |
251 | .id = &vlan_net_id, | |
252 | .size = sizeof(struct tc_action_net), | |
c7e2b968 JP |
253 | }; |
254 | ||
255 | static int __init vlan_init_module(void) | |
256 | { | |
ddf97ccd | 257 | return tcf_register_action(&act_vlan_ops, &vlan_net_ops); |
c7e2b968 JP |
258 | } |
259 | ||
260 | static void __exit vlan_cleanup_module(void) | |
261 | { | |
ddf97ccd | 262 | tcf_unregister_action(&act_vlan_ops, &vlan_net_ops); |
c7e2b968 JP |
263 | } |
264 | ||
265 | module_init(vlan_init_module); | |
266 | module_exit(vlan_cleanup_module); | |
267 | ||
268 | MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>"); | |
269 | MODULE_DESCRIPTION("vlan manipulation actions"); | |
270 | MODULE_LICENSE("GPL v2"); |