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