ia64/linux-2.6.18-xen.hg

view net/ipv6/xfrm6_policy.c @ 673:3161879fdf22

[IA64] xencomm: support XENMEM_add_to_physmap and XENMEM_remove_from_phsymap

support XENMEM_add_to_physmap and XENMEM_remove_from_phsymap.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Tue Sep 16 21:26:15 2008 +0900 (2008-09-16)
parents 831230e53067
children
line source
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 */
14 #include <linux/compiler.h>
15 #include <linux/netdevice.h>
16 #include <net/addrconf.h>
17 #include <net/xfrm.h>
18 #include <net/ip.h>
19 #include <net/ipv6.h>
20 #include <net/ip6_route.h>
22 static struct dst_ops xfrm6_dst_ops;
23 static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
25 static 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 }
34 static struct dst_entry *
35 __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
36 {
37 struct dst_entry *dst;
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;
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 }
62 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
63 * all the metrics... Shortly, bundle a bundle.
64 */
66 static 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;
88 dst = dst_prev = NULL;
89 dst_hold(&rt->u.dst);
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;
96 if (unlikely(dst1 == NULL)) {
97 err = -ENOBUFS;
98 dst_release(&rt->u.dst);
99 goto error;
100 }
102 if (!dst)
103 dst = dst1;
104 else {
105 dst_prev->child = dst1;
106 dst1->flags |= DST_NOHASH;
107 dst_clone(dst1);
108 }
110 xdst = (struct xfrm_dst *)dst1;
111 xdst->route = &rt->u.dst;
112 if (rt->rt6i_node)
113 xdst->route_cookie = rt->rt6i_node->fn_sernum;
115 dst1->next = dst_prev;
116 dst_prev = dst1;
117 if (xfrm[i]->props.mode) {
118 remote = (struct in6_addr*)&xfrm[i]->id.daddr;
119 local = (struct in6_addr*)&xfrm[i]->props.saddr;
120 tunnel = 1;
121 }
122 header_len += xfrm[i]->props.header_len;
123 trailer_len += xfrm[i]->props.trailer_len;
125 if (tunnel) {
126 ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
127 ipv6_addr_copy(&fl_tunnel.fl6_src, local);
128 err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
129 &fl_tunnel, AF_INET6);
130 if (err)
131 goto error;
132 } else
133 dst_hold(&rt->u.dst);
134 }
136 dst_prev->child = &rt->u.dst;
137 dst->path = &rt->u.dst;
138 if (rt->rt6i_node)
139 ((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum;
141 *dst_p = dst;
142 dst = dst_prev;
144 dst_prev = *dst_p;
145 i = 0;
146 for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
147 struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
149 dst_prev->xfrm = xfrm[i++];
150 dst_prev->dev = rt->u.dst.dev;
151 if (rt->u.dst.dev)
152 dev_hold(rt->u.dst.dev);
153 dst_prev->obsolete = -1;
154 dst_prev->flags |= DST_HOST;
155 dst_prev->lastuse = jiffies;
156 dst_prev->header_len = header_len;
157 dst_prev->trailer_len = trailer_len;
158 memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
160 /* Copy neighbour for reachability confirmation */
161 dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
162 dst_prev->input = rt->u.dst.input;
163 dst_prev->output = xfrm6_output;
164 /* Sheit... I remember I did this right. Apparently,
165 * it was magically lost, so this code needs audit */
166 x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
167 x->u.rt6.rt6i_metric = rt0->rt6i_metric;
168 x->u.rt6.rt6i_node = rt0->rt6i_node;
169 x->u.rt6.rt6i_gateway = rt0->rt6i_gateway;
170 memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway));
171 x->u.rt6.rt6i_dst = rt0->rt6i_dst;
172 x->u.rt6.rt6i_src = rt0->rt6i_src;
173 x->u.rt6.rt6i_idev = rt0->rt6i_idev;
174 in6_dev_hold(rt0->rt6i_idev);
175 header_len -= x->u.dst.xfrm->props.header_len;
176 trailer_len -= x->u.dst.xfrm->props.trailer_len;
177 }
179 xfrm_init_pmtu(dst);
180 return 0;
182 error:
183 if (dst)
184 dst_free(dst);
185 return err;
186 }
188 static inline void
189 _decode_session6(struct sk_buff *skb, struct flowi *fl)
190 {
191 u16 offset = skb->h.raw - skb->nh.raw;
192 struct ipv6hdr *hdr = skb->nh.ipv6h;
193 struct ipv6_opt_hdr *exthdr;
194 u8 nexthdr = skb->nh.raw[IP6CB(skb)->nhoff];
196 memset(fl, 0, sizeof(struct flowi));
197 ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
198 ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
200 while (pskb_may_pull(skb, skb->nh.raw + offset + 1 - skb->data)) {
201 exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
203 switch (nexthdr) {
204 case NEXTHDR_ROUTING:
205 case NEXTHDR_HOP:
206 case NEXTHDR_DEST:
207 offset += ipv6_optlen(exthdr);
208 nexthdr = exthdr->nexthdr;
209 exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
210 break;
212 case IPPROTO_UDP:
213 case IPPROTO_TCP:
214 case IPPROTO_SCTP:
215 case IPPROTO_DCCP:
216 if (pskb_may_pull(skb, skb->nh.raw + offset + 4 - skb->data)) {
217 u16 *ports = (u16 *)exthdr;
219 fl->fl_ip_sport = ports[0];
220 fl->fl_ip_dport = ports[1];
221 }
222 fl->proto = nexthdr;
223 return;
225 case IPPROTO_ICMPV6:
226 if (pskb_may_pull(skb, skb->nh.raw + offset + 2 - skb->data)) {
227 u8 *icmp = (u8 *)exthdr;
229 fl->fl_icmp_type = icmp[0];
230 fl->fl_icmp_code = icmp[1];
231 }
232 fl->proto = nexthdr;
233 return;
235 /* XXX Why are there these headers? */
236 case IPPROTO_AH:
237 case IPPROTO_ESP:
238 case IPPROTO_COMP:
239 default:
240 fl->fl_ipsec_spi = 0;
241 fl->proto = nexthdr;
242 return;
243 };
244 }
245 }
247 static inline int xfrm6_garbage_collect(void)
248 {
249 xfrm6_policy_afinfo.garbage_collect();
250 return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
251 }
253 static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
254 {
255 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
256 struct dst_entry *path = xdst->route;
258 path->ops->update_pmtu(path, mtu);
259 }
261 static void xfrm6_dst_destroy(struct dst_entry *dst)
262 {
263 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
265 if (likely(xdst->u.rt6.rt6i_idev))
266 in6_dev_put(xdst->u.rt6.rt6i_idev);
267 xfrm_dst_destroy(xdst);
268 }
270 static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
271 int unregister)
272 {
273 struct xfrm_dst *xdst;
275 if (!unregister)
276 return;
278 xdst = (struct xfrm_dst *)dst;
279 if (xdst->u.rt6.rt6i_idev->dev == dev) {
280 struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
281 BUG_ON(!loopback_idev);
283 do {
284 in6_dev_put(xdst->u.rt6.rt6i_idev);
285 xdst->u.rt6.rt6i_idev = loopback_idev;
286 in6_dev_hold(loopback_idev);
287 xdst = (struct xfrm_dst *)xdst->u.dst.child;
288 } while (xdst->u.dst.xfrm);
290 __in6_dev_put(loopback_idev);
291 }
293 xfrm_dst_ifdown(dst, dev);
294 }
296 static struct dst_ops xfrm6_dst_ops = {
297 .family = AF_INET6,
298 .protocol = __constant_htons(ETH_P_IPV6),
299 .gc = xfrm6_garbage_collect,
300 .update_pmtu = xfrm6_update_pmtu,
301 .destroy = xfrm6_dst_destroy,
302 .ifdown = xfrm6_dst_ifdown,
303 .gc_thresh = 1024,
304 .entry_size = sizeof(struct xfrm_dst),
305 };
307 static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
308 .family = AF_INET6,
309 .dst_ops = &xfrm6_dst_ops,
310 .dst_lookup = xfrm6_dst_lookup,
311 .find_bundle = __xfrm6_find_bundle,
312 .bundle_create = __xfrm6_bundle_create,
313 .decode_session = _decode_session6,
314 };
316 static void __init xfrm6_policy_init(void)
317 {
318 xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
319 }
321 static void xfrm6_policy_fini(void)
322 {
323 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
324 }
326 void __init xfrm6_init(void)
327 {
328 xfrm6_policy_init();
329 xfrm6_state_init();
330 }
332 void xfrm6_fini(void)
333 {
334 //xfrm6_input_fini();
335 xfrm6_policy_fini();
336 xfrm6_state_fini();
337 }