x86, mce, AMD: Fix leaving freed data in a list
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / xfrm6_policy.c
blobae181651c75a82d32fdb6596068e3bb5c7839740
1 /*
2 * xfrm6_policy.c: based on xfrm4_policy.c
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
14 #include <linux/err.h>
15 #include <linux/kernel.h>
16 #include <linux/netdevice.h>
17 #include <net/addrconf.h>
18 #include <net/dst.h>
19 #include <net/xfrm.h>
20 #include <net/ip.h>
21 #include <net/ipv6.h>
22 #include <net/ip6_route.h>
23 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
24 #include <net/mip6.h>
25 #endif
27 static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
29 static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos,
30 xfrm_address_t *saddr,
31 xfrm_address_t *daddr)
33 struct flowi fl = {};
34 struct dst_entry *dst;
35 int err;
37 memcpy(&fl.fl6_dst, daddr, sizeof(fl.fl6_dst));
38 if (saddr)
39 memcpy(&fl.fl6_src, saddr, sizeof(fl.fl6_src));
41 dst = ip6_route_output(net, NULL, &fl);
43 err = dst->error;
44 if (dst->error) {
45 dst_release(dst);
46 dst = ERR_PTR(err);
49 return dst;
52 static int xfrm6_get_saddr(struct net *net,
53 xfrm_address_t *saddr, xfrm_address_t *daddr)
55 struct dst_entry *dst;
56 struct net_device *dev;
58 dst = xfrm6_dst_lookup(net, 0, NULL, daddr);
59 if (IS_ERR(dst))
60 return -EHOSTUNREACH;
62 dev = ip6_dst_idev(dst)->dev;
63 ipv6_dev_get_saddr(dev_net(dev), dev,
64 (struct in6_addr *)&daddr->a6, 0,
65 (struct in6_addr *)&saddr->a6);
66 dst_release(dst);
67 return 0;
70 static struct dst_entry *
71 __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
73 struct dst_entry *dst;
75 /* Still not clear if we should set fl->fl6_{src,dst}... */
76 read_lock_bh(&policy->lock);
77 for (dst = policy->bundles; dst; dst = dst->next) {
78 struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
79 struct in6_addr fl_dst_prefix, fl_src_prefix;
81 ipv6_addr_prefix(&fl_dst_prefix,
82 &fl->fl6_dst,
83 xdst->u.rt6.rt6i_dst.plen);
84 ipv6_addr_prefix(&fl_src_prefix,
85 &fl->fl6_src,
86 xdst->u.rt6.rt6i_src.plen);
87 if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
88 ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
89 xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
90 (xdst->u.rt6.rt6i_dst.plen != 128 ||
91 xdst->u.rt6.rt6i_src.plen != 128))) {
92 dst_clone(dst);
93 break;
96 read_unlock_bh(&policy->lock);
97 return dst;
100 static int xfrm6_get_tos(struct flowi *fl)
102 return 0;
105 static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
106 int nfheader_len)
108 if (dst->ops->family == AF_INET6) {
109 struct rt6_info *rt = (struct rt6_info*)dst;
110 if (rt->rt6i_node)
111 path->path_cookie = rt->rt6i_node->fn_sernum;
114 path->u.rt6.rt6i_nfheader_len = nfheader_len;
116 return 0;
119 static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
120 struct flowi *fl)
122 struct rt6_info *rt = (struct rt6_info*)xdst->route;
124 xdst->u.dst.dev = dev;
125 dev_hold(dev);
127 xdst->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev);
128 if (!xdst->u.rt6.rt6i_idev)
129 return -ENODEV;
131 /* Sheit... I remember I did this right. Apparently,
132 * it was magically lost, so this code needs audit */
133 xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
134 RTF_LOCAL);
135 xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
136 xdst->u.rt6.rt6i_node = rt->rt6i_node;
137 if (rt->rt6i_node)
138 xdst->route_cookie = rt->rt6i_node->fn_sernum;
139 xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
140 xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
141 xdst->u.rt6.rt6i_src = rt->rt6i_src;
143 return 0;
146 static inline void
147 _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
149 int onlyproto = 0;
150 u16 offset = skb_network_header_len(skb);
151 struct ipv6hdr *hdr = ipv6_hdr(skb);
152 struct ipv6_opt_hdr *exthdr;
153 const unsigned char *nh = skb_network_header(skb);
154 u8 nexthdr = nh[IP6CB(skb)->nhoff];
156 memset(fl, 0, sizeof(struct flowi));
157 ipv6_addr_copy(&fl->fl6_dst, reverse ? &hdr->saddr : &hdr->daddr);
158 ipv6_addr_copy(&fl->fl6_src, reverse ? &hdr->daddr : &hdr->saddr);
160 while (nh + offset + 1 < skb->data ||
161 pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
162 nh = skb_network_header(skb);
163 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
165 switch (nexthdr) {
166 case NEXTHDR_FRAGMENT:
167 onlyproto = 1;
168 case NEXTHDR_ROUTING:
169 case NEXTHDR_HOP:
170 case NEXTHDR_DEST:
171 offset += ipv6_optlen(exthdr);
172 nexthdr = exthdr->nexthdr;
173 exthdr = (struct ipv6_opt_hdr *)(nh + offset);
174 break;
176 case IPPROTO_UDP:
177 case IPPROTO_UDPLITE:
178 case IPPROTO_TCP:
179 case IPPROTO_SCTP:
180 case IPPROTO_DCCP:
181 if (!onlyproto && (nh + offset + 4 < skb->data ||
182 pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
183 __be16 *ports = (__be16 *)exthdr;
185 fl->fl_ip_sport = ports[!!reverse];
186 fl->fl_ip_dport = ports[!reverse];
188 fl->proto = nexthdr;
189 return;
191 case IPPROTO_ICMPV6:
192 if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
193 u8 *icmp = (u8 *)exthdr;
195 fl->fl_icmp_type = icmp[0];
196 fl->fl_icmp_code = icmp[1];
198 fl->proto = nexthdr;
199 return;
201 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
202 case IPPROTO_MH:
203 if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
204 struct ip6_mh *mh;
205 mh = (struct ip6_mh *)exthdr;
207 fl->fl_mh_type = mh->ip6mh_type;
209 fl->proto = nexthdr;
210 return;
211 #endif
213 /* XXX Why are there these headers? */
214 case IPPROTO_AH:
215 case IPPROTO_ESP:
216 case IPPROTO_COMP:
217 default:
218 fl->fl_ipsec_spi = 0;
219 fl->proto = nexthdr;
220 return;
225 static inline int xfrm6_garbage_collect(struct dst_ops *ops)
227 struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops);
229 xfrm6_policy_afinfo.garbage_collect(net);
230 return (atomic_read(&ops->entries) > ops->gc_thresh * 2);
233 static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
235 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
236 struct dst_entry *path = xdst->route;
238 path->ops->update_pmtu(path, mtu);
241 static void xfrm6_dst_destroy(struct dst_entry *dst)
243 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
245 if (likely(xdst->u.rt6.rt6i_idev))
246 in6_dev_put(xdst->u.rt6.rt6i_idev);
247 xfrm_dst_destroy(xdst);
250 static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
251 int unregister)
253 struct xfrm_dst *xdst;
255 if (!unregister)
256 return;
258 xdst = (struct xfrm_dst *)dst;
259 if (xdst->u.rt6.rt6i_idev->dev == dev) {
260 struct inet6_dev *loopback_idev =
261 in6_dev_get(dev_net(dev)->loopback_dev);
262 BUG_ON(!loopback_idev);
264 do {
265 in6_dev_put(xdst->u.rt6.rt6i_idev);
266 xdst->u.rt6.rt6i_idev = loopback_idev;
267 in6_dev_hold(loopback_idev);
268 xdst = (struct xfrm_dst *)xdst->u.dst.child;
269 } while (xdst->u.dst.xfrm);
271 __in6_dev_put(loopback_idev);
274 xfrm_dst_ifdown(dst, dev);
277 static struct dst_ops xfrm6_dst_ops = {
278 .family = AF_INET6,
279 .protocol = cpu_to_be16(ETH_P_IPV6),
280 .gc = xfrm6_garbage_collect,
281 .update_pmtu = xfrm6_update_pmtu,
282 .destroy = xfrm6_dst_destroy,
283 .ifdown = xfrm6_dst_ifdown,
284 .local_out = __ip6_local_out,
285 .gc_thresh = 1024,
286 .entries = ATOMIC_INIT(0),
289 static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
290 .family = AF_INET6,
291 .dst_ops = &xfrm6_dst_ops,
292 .dst_lookup = xfrm6_dst_lookup,
293 .get_saddr = xfrm6_get_saddr,
294 .find_bundle = __xfrm6_find_bundle,
295 .decode_session = _decode_session6,
296 .get_tos = xfrm6_get_tos,
297 .init_path = xfrm6_init_path,
298 .fill_dst = xfrm6_fill_dst,
301 static int __init xfrm6_policy_init(void)
303 return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
306 static void xfrm6_policy_fini(void)
308 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
311 #ifdef CONFIG_SYSCTL
312 static struct ctl_table xfrm6_policy_table[] = {
314 .procname = "xfrm6_gc_thresh",
315 .data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
316 .maxlen = sizeof(int),
317 .mode = 0644,
318 .proc_handler = proc_dointvec,
323 static struct ctl_table_header *sysctl_hdr;
324 #endif
326 int __init xfrm6_init(void)
328 int ret;
329 unsigned int gc_thresh;
332 * We need a good default value for the xfrm6 gc threshold.
333 * In ipv4 we set it to the route hash table size * 8, which
334 * is half the size of the maximaum route cache for ipv4. It
335 * would be good to do the same thing for v6, except the table is
336 * constructed differently here. Here each table for a net namespace
337 * can have FIB_TABLE_HASHSZ entries, so lets go with the same
338 * computation that we used for ipv4 here. Also, lets keep the initial
339 * gc_thresh to a minimum of 1024, since, the ipv6 route cache defaults
340 * to that as a minimum as well
342 gc_thresh = FIB6_TABLE_HASHSZ * 8;
343 xfrm6_dst_ops.gc_thresh = (gc_thresh < 1024) ? 1024 : gc_thresh;
345 ret = xfrm6_policy_init();
346 if (ret)
347 goto out;
349 ret = xfrm6_state_init();
350 if (ret)
351 goto out_policy;
353 #ifdef CONFIG_SYSCTL
354 sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv6_ctl_path,
355 xfrm6_policy_table);
356 #endif
357 out:
358 return ret;
359 out_policy:
360 xfrm6_policy_fini();
361 goto out;
364 void xfrm6_fini(void)
366 #ifdef CONFIG_SYSCTL
367 if (sysctl_hdr)
368 unregister_net_sysctl_table(sysctl_hdr);
369 #endif
370 //xfrm6_input_fini();
371 xfrm6_policy_fini();
372 xfrm6_state_fini();