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Diffstat (limited to 'net/ipv6/xfrm6_policy.c')
-rw-r--r--net/ipv6/xfrm6_policy.c295
1 files changed, 295 insertions, 0 deletions
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
new file mode 100644
index 000000000000..8a4f37de4d2d
--- /dev/null
+++ b/net/ipv6/xfrm6_policy.c
@@ -0,0 +1,295 @@
1/*
2 * xfrm6_policy.c: based on xfrm4_policy.c
3 *
4 * Authors:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * YOSHIFUJI Hideaki
10 * Split up af-specific portion
11 *
12 */
13
14#include <linux/config.h>
15#include <net/xfrm.h>
16#include <net/ip.h>
17#include <net/ipv6.h>
18#include <net/ip6_route.h>
19
20static struct dst_ops xfrm6_dst_ops;
21static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
22
23static struct xfrm_type_map xfrm6_type_map = { .lock = RW_LOCK_UNLOCKED };
24
25static int xfrm6_dst_lookup(struct xfrm_dst **dst, struct flowi *fl)
26{
27 int err = 0;
28 *dst = (struct xfrm_dst*)ip6_route_output(NULL, fl);
29 if (!*dst)
30 err = -ENETUNREACH;
31 return err;
32}
33
34static struct dst_entry *
35__xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
36{
37 struct dst_entry *dst;
38
39 /* Still not clear if we should set fl->fl6_{src,dst}... */
40 read_lock_bh(&policy->lock);
41 for (dst = policy->bundles; dst; dst = dst->next) {
42 struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
43 struct in6_addr fl_dst_prefix, fl_src_prefix;
44
45 ipv6_addr_prefix(&fl_dst_prefix,
46 &fl->fl6_dst,
47 xdst->u.rt6.rt6i_dst.plen);
48 ipv6_addr_prefix(&fl_src_prefix,
49 &fl->fl6_src,
50 xdst->u.rt6.rt6i_src.plen);
51 if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
52 ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
53 xfrm_bundle_ok(xdst, fl, AF_INET6)) {
54 dst_clone(dst);
55 break;
56 }
57 }
58 read_unlock_bh(&policy->lock);
59 return dst;
60}
61
62/* Allocate chain of dst_entry's, attach known xfrm's, calculate
63 * all the metrics... Shortly, bundle a bundle.
64 */
65
66static int
67__xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
68 struct flowi *fl, struct dst_entry **dst_p)
69{
70 struct dst_entry *dst, *dst_prev;
71 struct rt6_info *rt0 = (struct rt6_info*)(*dst_p);
72 struct rt6_info *rt = rt0;
73 struct in6_addr *remote = &fl->fl6_dst;
74 struct in6_addr *local = &fl->fl6_src;
75 struct flowi fl_tunnel = {
76 .nl_u = {
77 .ip6_u = {
78 .saddr = *local,
79 .daddr = *remote
80 }
81 }
82 };
83 int i;
84 int err = 0;
85 int header_len = 0;
86 int trailer_len = 0;
87
88 dst = dst_prev = NULL;
89 dst_hold(&rt->u.dst);
90
91 for (i = 0; i < nx; i++) {
92 struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
93 struct xfrm_dst *xdst;
94 int tunnel = 0;
95
96 if (unlikely(dst1 == NULL)) {
97 err = -ENOBUFS;
98 dst_release(&rt->u.dst);
99 goto error;
100 }
101
102 if (!dst)
103 dst = dst1;
104 else {
105 dst_prev->child = dst1;
106 dst1->flags |= DST_NOHASH;
107 dst_clone(dst1);
108 }
109
110 xdst = (struct xfrm_dst *)dst1;
111 xdst->route = &rt->u.dst;
112
113 dst1->next = dst_prev;
114 dst_prev = dst1;
115 if (xfrm[i]->props.mode) {
116 remote = (struct in6_addr*)&xfrm[i]->id.daddr;
117 local = (struct in6_addr*)&xfrm[i]->props.saddr;
118 tunnel = 1;
119 }
120 header_len += xfrm[i]->props.header_len;
121 trailer_len += xfrm[i]->props.trailer_len;
122
123 if (tunnel) {
124 ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
125 ipv6_addr_copy(&fl_tunnel.fl6_src, local);
126 err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
127 &fl_tunnel, AF_INET6);
128 if (err)
129 goto error;
130 } else
131 dst_hold(&rt->u.dst);
132 }
133
134 dst_prev->child = &rt->u.dst;
135 dst->path = &rt->u.dst;
136
137 *dst_p = dst;
138 dst = dst_prev;
139
140 dst_prev = *dst_p;
141 i = 0;
142 for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
143 struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
144
145 dst_prev->xfrm = xfrm[i++];
146 dst_prev->dev = rt->u.dst.dev;
147 if (rt->u.dst.dev)
148 dev_hold(rt->u.dst.dev);
149 dst_prev->obsolete = -1;
150 dst_prev->flags |= DST_HOST;
151 dst_prev->lastuse = jiffies;
152 dst_prev->header_len = header_len;
153 dst_prev->trailer_len = trailer_len;
154 memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
155
156 /* Copy neighbour for reachability confirmation */
157 dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
158 dst_prev->input = rt->u.dst.input;
159 dst_prev->output = xfrm6_output;
160 /* Sheit... I remember I did this right. Apparently,
161 * it was magically lost, so this code needs audit */
162 x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
163 x->u.rt6.rt6i_metric = rt0->rt6i_metric;
164 x->u.rt6.rt6i_node = rt0->rt6i_node;
165 x->u.rt6.rt6i_gateway = rt0->rt6i_gateway;
166 memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway));
167 x->u.rt6.rt6i_dst = rt0->rt6i_dst;
168 x->u.rt6.rt6i_src = rt0->rt6i_src;
169 header_len -= x->u.dst.xfrm->props.header_len;
170 trailer_len -= x->u.dst.xfrm->props.trailer_len;
171 }
172
173 xfrm_init_pmtu(dst);
174 return 0;
175
176error:
177 if (dst)
178 dst_free(dst);
179 return err;
180}
181
182static inline void
183_decode_session6(struct sk_buff *skb, struct flowi *fl)
184{
185 u16 offset = sizeof(struct ipv6hdr);
186 struct ipv6hdr *hdr = skb->nh.ipv6h;
187 struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
188 u8 nexthdr = skb->nh.ipv6h->nexthdr;
189
190 memset(fl, 0, sizeof(struct flowi));
191 ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
192 ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
193
194 while (pskb_may_pull(skb, skb->nh.raw + offset + 1 - skb->data)) {
195 switch (nexthdr) {
196 case NEXTHDR_ROUTING:
197 case NEXTHDR_HOP:
198 case NEXTHDR_DEST:
199 offset += ipv6_optlen(exthdr);
200 nexthdr = exthdr->nexthdr;
201 exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
202 break;
203
204 case IPPROTO_UDP:
205 case IPPROTO_TCP:
206 case IPPROTO_SCTP:
207 if (pskb_may_pull(skb, skb->nh.raw + offset + 4 - skb->data)) {
208 u16 *ports = (u16 *)exthdr;
209
210 fl->fl_ip_sport = ports[0];
211 fl->fl_ip_dport = ports[1];
212 }
213 fl->proto = nexthdr;
214 return;
215
216 case IPPROTO_ICMPV6:
217 if (pskb_may_pull(skb, skb->nh.raw + offset + 2 - skb->data)) {
218 u8 *icmp = (u8 *)exthdr;
219
220 fl->fl_icmp_type = icmp[0];
221 fl->fl_icmp_code = icmp[1];
222 }
223 fl->proto = nexthdr;
224 return;
225
226 /* XXX Why are there these headers? */
227 case IPPROTO_AH:
228 case IPPROTO_ESP:
229 case IPPROTO_COMP:
230 default:
231 fl->fl_ipsec_spi = 0;
232 fl->proto = nexthdr;
233 return;
234 };
235 }
236}
237
238static inline int xfrm6_garbage_collect(void)
239{
240 read_lock(&xfrm6_policy_afinfo.lock);
241 xfrm6_policy_afinfo.garbage_collect();
242 read_unlock(&xfrm6_policy_afinfo.lock);
243 return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
244}
245
246static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
247{
248 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
249 struct dst_entry *path = xdst->route;
250
251 path->ops->update_pmtu(path, mtu);
252}
253
254static struct dst_ops xfrm6_dst_ops = {
255 .family = AF_INET6,
256 .protocol = __constant_htons(ETH_P_IPV6),
257 .gc = xfrm6_garbage_collect,
258 .update_pmtu = xfrm6_update_pmtu,
259 .gc_thresh = 1024,
260 .entry_size = sizeof(struct xfrm_dst),
261};
262
263static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
264 .family = AF_INET6,
265 .lock = RW_LOCK_UNLOCKED,
266 .type_map = &xfrm6_type_map,
267 .dst_ops = &xfrm6_dst_ops,
268 .dst_lookup = xfrm6_dst_lookup,
269 .find_bundle = __xfrm6_find_bundle,
270 .bundle_create = __xfrm6_bundle_create,
271 .decode_session = _decode_session6,
272};
273
274static void __init xfrm6_policy_init(void)
275{
276 xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
277}
278
279static void xfrm6_policy_fini(void)
280{
281 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
282}
283
284void __init xfrm6_init(void)
285{
286 xfrm6_policy_init();
287 xfrm6_state_init();
288}
289
290void xfrm6_fini(void)
291{
292 //xfrm6_input_fini();
293 xfrm6_policy_fini();
294 xfrm6_state_fini();
295}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-28 11:06:37 -0500