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