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