Commit | Line | Data |
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499a2425 RP |
1 | /* |
2 | * lwtunnel Infrastructure for light weight tunnels like mpls | |
3 | * | |
4 | * Authors: Roopa Prabhu, <roopa@cumulusnetworks.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/capability.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/uaccess.h> | |
19 | #include <linux/skbuff.h> | |
20 | #include <linux/netdevice.h> | |
21 | #include <linux/lwtunnel.h> | |
22 | #include <linux/in.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/err.h> | |
25 | ||
26 | #include <net/lwtunnel.h> | |
27 | #include <net/rtnetlink.h> | |
ffce4196 | 28 | #include <net/ip6_fib.h> |
499a2425 RP |
29 | |
30 | struct lwtunnel_state *lwtunnel_state_alloc(int encap_len) | |
31 | { | |
32 | struct lwtunnel_state *lws; | |
33 | ||
34 | lws = kzalloc(sizeof(*lws) + encap_len, GFP_ATOMIC); | |
35 | ||
36 | return lws; | |
37 | } | |
38 | EXPORT_SYMBOL(lwtunnel_state_alloc); | |
39 | ||
92a99bf3 | 40 | static const struct lwtunnel_encap_ops __rcu * |
499a2425 RP |
41 | lwtun_encaps[LWTUNNEL_ENCAP_MAX + 1] __read_mostly; |
42 | ||
43 | int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *ops, | |
44 | unsigned int num) | |
45 | { | |
46 | if (num > LWTUNNEL_ENCAP_MAX) | |
47 | return -ERANGE; | |
48 | ||
49 | return !cmpxchg((const struct lwtunnel_encap_ops **) | |
50 | &lwtun_encaps[num], | |
51 | NULL, ops) ? 0 : -1; | |
52 | } | |
53 | EXPORT_SYMBOL(lwtunnel_encap_add_ops); | |
54 | ||
55 | int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *ops, | |
56 | unsigned int encap_type) | |
57 | { | |
58 | int ret; | |
59 | ||
60 | if (encap_type == LWTUNNEL_ENCAP_NONE || | |
61 | encap_type > LWTUNNEL_ENCAP_MAX) | |
62 | return -ERANGE; | |
63 | ||
64 | ret = (cmpxchg((const struct lwtunnel_encap_ops **) | |
65 | &lwtun_encaps[encap_type], | |
66 | ops, NULL) == ops) ? 0 : -1; | |
67 | ||
68 | synchronize_net(); | |
69 | ||
70 | return ret; | |
71 | } | |
72 | EXPORT_SYMBOL(lwtunnel_encap_del_ops); | |
73 | ||
74 | int lwtunnel_build_state(struct net_device *dev, u16 encap_type, | |
127eb7cd TH |
75 | struct nlattr *encap, unsigned int family, |
76 | const void *cfg, struct lwtunnel_state **lws) | |
499a2425 RP |
77 | { |
78 | const struct lwtunnel_encap_ops *ops; | |
79 | int ret = -EINVAL; | |
80 | ||
81 | if (encap_type == LWTUNNEL_ENCAP_NONE || | |
82 | encap_type > LWTUNNEL_ENCAP_MAX) | |
83 | return ret; | |
84 | ||
85 | ret = -EOPNOTSUPP; | |
86 | rcu_read_lock(); | |
87 | ops = rcu_dereference(lwtun_encaps[encap_type]); | |
88 | if (likely(ops && ops->build_state)) | |
127eb7cd | 89 | ret = ops->build_state(dev, encap, family, cfg, lws); |
499a2425 RP |
90 | rcu_read_unlock(); |
91 | ||
92 | return ret; | |
93 | } | |
94 | EXPORT_SYMBOL(lwtunnel_build_state); | |
95 | ||
96 | int lwtunnel_fill_encap(struct sk_buff *skb, struct lwtunnel_state *lwtstate) | |
97 | { | |
98 | const struct lwtunnel_encap_ops *ops; | |
99 | struct nlattr *nest; | |
100 | int ret = -EINVAL; | |
101 | ||
102 | if (!lwtstate) | |
103 | return 0; | |
104 | ||
105 | if (lwtstate->type == LWTUNNEL_ENCAP_NONE || | |
106 | lwtstate->type > LWTUNNEL_ENCAP_MAX) | |
107 | return 0; | |
108 | ||
109 | ret = -EOPNOTSUPP; | |
110 | nest = nla_nest_start(skb, RTA_ENCAP); | |
111 | rcu_read_lock(); | |
112 | ops = rcu_dereference(lwtun_encaps[lwtstate->type]); | |
113 | if (likely(ops && ops->fill_encap)) | |
114 | ret = ops->fill_encap(skb, lwtstate); | |
115 | rcu_read_unlock(); | |
116 | ||
117 | if (ret) | |
118 | goto nla_put_failure; | |
119 | nla_nest_end(skb, nest); | |
120 | ret = nla_put_u16(skb, RTA_ENCAP_TYPE, lwtstate->type); | |
121 | if (ret) | |
122 | goto nla_put_failure; | |
123 | ||
124 | return 0; | |
125 | ||
126 | nla_put_failure: | |
127 | nla_nest_cancel(skb, nest); | |
128 | ||
129 | return (ret == -EOPNOTSUPP ? 0 : ret); | |
130 | } | |
131 | EXPORT_SYMBOL(lwtunnel_fill_encap); | |
132 | ||
133 | int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate) | |
134 | { | |
135 | const struct lwtunnel_encap_ops *ops; | |
136 | int ret = 0; | |
137 | ||
138 | if (!lwtstate) | |
139 | return 0; | |
140 | ||
141 | if (lwtstate->type == LWTUNNEL_ENCAP_NONE || | |
142 | lwtstate->type > LWTUNNEL_ENCAP_MAX) | |
143 | return 0; | |
144 | ||
145 | rcu_read_lock(); | |
146 | ops = rcu_dereference(lwtun_encaps[lwtstate->type]); | |
147 | if (likely(ops && ops->get_encap_size)) | |
148 | ret = nla_total_size(ops->get_encap_size(lwtstate)); | |
149 | rcu_read_unlock(); | |
150 | ||
151 | return ret; | |
152 | } | |
153 | EXPORT_SYMBOL(lwtunnel_get_encap_size); | |
154 | ||
155 | int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b) | |
156 | { | |
157 | const struct lwtunnel_encap_ops *ops; | |
158 | int ret = 0; | |
159 | ||
160 | if (!a && !b) | |
161 | return 0; | |
162 | ||
163 | if (!a || !b) | |
164 | return 1; | |
165 | ||
166 | if (a->type != b->type) | |
167 | return 1; | |
168 | ||
169 | if (a->type == LWTUNNEL_ENCAP_NONE || | |
170 | a->type > LWTUNNEL_ENCAP_MAX) | |
171 | return 0; | |
172 | ||
173 | rcu_read_lock(); | |
174 | ops = rcu_dereference(lwtun_encaps[a->type]); | |
175 | if (likely(ops && ops->cmp_encap)) | |
176 | ret = ops->cmp_encap(a, b); | |
177 | rcu_read_unlock(); | |
178 | ||
179 | return ret; | |
180 | } | |
181 | EXPORT_SYMBOL(lwtunnel_cmp_encap); | |
ffce4196 | 182 | |
ede2059d | 183 | int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
ffce4196 | 184 | { |
61adedf3 | 185 | struct dst_entry *dst = skb_dst(skb); |
ffce4196 | 186 | const struct lwtunnel_encap_ops *ops; |
61adedf3 | 187 | struct lwtunnel_state *lwtstate; |
ffce4196 RP |
188 | int ret = -EINVAL; |
189 | ||
61adedf3 | 190 | if (!dst) |
ffce4196 | 191 | goto drop; |
61adedf3 | 192 | lwtstate = dst->lwtstate; |
ffce4196 RP |
193 | |
194 | if (lwtstate->type == LWTUNNEL_ENCAP_NONE || | |
195 | lwtstate->type > LWTUNNEL_ENCAP_MAX) | |
196 | return 0; | |
197 | ||
198 | ret = -EOPNOTSUPP; | |
199 | rcu_read_lock(); | |
200 | ops = rcu_dereference(lwtun_encaps[lwtstate->type]); | |
201 | if (likely(ops && ops->output)) | |
ede2059d | 202 | ret = ops->output(net, sk, skb); |
ffce4196 RP |
203 | rcu_read_unlock(); |
204 | ||
205 | if (ret == -EOPNOTSUPP) | |
206 | goto drop; | |
207 | ||
208 | return ret; | |
209 | ||
210 | drop: | |
e11f40b9 | 211 | kfree_skb(skb); |
ffce4196 RP |
212 | |
213 | return ret; | |
214 | } | |
ffce4196 | 215 | EXPORT_SYMBOL(lwtunnel_output); |
25368623 | 216 | |
61adedf3 | 217 | int lwtunnel_input(struct sk_buff *skb) |
25368623 | 218 | { |
61adedf3 | 219 | struct dst_entry *dst = skb_dst(skb); |
25368623 | 220 | const struct lwtunnel_encap_ops *ops; |
61adedf3 | 221 | struct lwtunnel_state *lwtstate; |
25368623 TH |
222 | int ret = -EINVAL; |
223 | ||
61adedf3 | 224 | if (!dst) |
25368623 | 225 | goto drop; |
61adedf3 | 226 | lwtstate = dst->lwtstate; |
25368623 TH |
227 | |
228 | if (lwtstate->type == LWTUNNEL_ENCAP_NONE || | |
229 | lwtstate->type > LWTUNNEL_ENCAP_MAX) | |
230 | return 0; | |
231 | ||
232 | ret = -EOPNOTSUPP; | |
233 | rcu_read_lock(); | |
234 | ops = rcu_dereference(lwtun_encaps[lwtstate->type]); | |
235 | if (likely(ops && ops->input)) | |
236 | ret = ops->input(skb); | |
237 | rcu_read_unlock(); | |
238 | ||
239 | if (ret == -EOPNOTSUPP) | |
240 | goto drop; | |
241 | ||
242 | return ret; | |
243 | ||
244 | drop: | |
245 | kfree_skb(skb); | |
246 | ||
247 | return ret; | |
248 | } | |
25368623 | 249 | EXPORT_SYMBOL(lwtunnel_input); |