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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 00000000000..8a4f37de4d2
--- /dev/null
+++ b/net/ipv6/xfrm6_policy.c
@@ -0,0 +1,295 @@
+/*
+ * xfrm6_policy.c: based on xfrm4_policy.c
+ *
+ * Authors:
+ * Mitsuru KANDA @USAGI
+ * Kazunori MIYAZAWA @USAGI
+ * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
+ * IPv6 support
+ * YOSHIFUJI Hideaki
+ * Split up af-specific portion
+ *
+ */
+
+#include <linux/config.h>
+#include <net/xfrm.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+
+static struct dst_ops xfrm6_dst_ops;
+static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
+
+static struct xfrm_type_map xfrm6_type_map = { .lock = RW_LOCK_UNLOCKED };
+
+static int xfrm6_dst_lookup(struct xfrm_dst **dst, struct flowi *fl)
+{
+ int err = 0;
+ *dst = (struct xfrm_dst*)ip6_route_output(NULL, fl);
+ if (!*dst)
+ err = -ENETUNREACH;
+ return err;
+}
+
+static struct dst_entry *
+__xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
+{
+ struct dst_entry *dst;
+
+ /* Still not clear if we should set fl->fl6_{src,dst}... */
+ read_lock_bh(&policy->lock);
+ for (dst = policy->bundles; dst; dst = dst->next) {
+ struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
+ struct in6_addr fl_dst_prefix, fl_src_prefix;
+
+ ipv6_addr_prefix(&fl_dst_prefix,
+ &fl->fl6_dst,
+ xdst->u.rt6.rt6i_dst.plen);
+ ipv6_addr_prefix(&fl_src_prefix,
+ &fl->fl6_src,
+ xdst->u.rt6.rt6i_src.plen);
+ if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
+ ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
+ xfrm_bundle_ok(xdst, fl, AF_INET6)) {
+ dst_clone(dst);
+ break;
+ }
+ }
+ read_unlock_bh(&policy->lock);
+ return dst;
+}
+
+/* Allocate chain of dst_entry's, attach known xfrm's, calculate
+ * all the metrics... Shortly, bundle a bundle.
+ */
+
+static int
+__xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
+ struct flowi *fl, struct dst_entry **dst_p)
+{
+ struct dst_entry *dst, *dst_prev;
+ struct rt6_info *rt0 = (struct rt6_info*)(*dst_p);
+ struct rt6_info *rt = rt0;
+ struct in6_addr *remote = &fl->fl6_dst;
+ struct in6_addr *local = &fl->fl6_src;
+ struct flowi fl_tunnel = {
+ .nl_u = {
+ .ip6_u = {
+ .saddr = *local,
+ .daddr = *remote
+ }
+ }
+ };
+ int i;
+ int err = 0;
+ int header_len = 0;
+ int trailer_len = 0;
+
+ dst = dst_prev = NULL;
+ dst_hold(&rt->u.dst);
+
+ for (i = 0; i < nx; i++) {
+ struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
+ struct xfrm_dst *xdst;
+ int tunnel = 0;
+
+ if (unlikely(dst1 == NULL)) {
+ err = -ENOBUFS;
+ dst_release(&rt->u.dst);
+ goto error;
+ }
+
+ if (!dst)
+ dst = dst1;
+ else {
+ dst_prev->child = dst1;
+ dst1->flags |= DST_NOHASH;
+ dst_clone(dst1);
+ }
+
+ xdst = (struct xfrm_dst *)dst1;
+ xdst->route = &rt->u.dst;
+
+ dst1->next = dst_prev;
+ dst_prev = dst1;
+ if (xfrm[i]->props.mode) {
+ remote = (struct in6_addr*)&xfrm[i]->id.daddr;
+ local = (struct in6_addr*)&xfrm[i]->props.saddr;
+ tunnel = 1;
+ }
+ header_len += xfrm[i]->props.header_len;
+ trailer_len += xfrm[i]->props.trailer_len;
+
+ if (tunnel) {
+ ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
+ ipv6_addr_copy(&fl_tunnel.fl6_src, local);
+ err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
+ &fl_tunnel, AF_INET6);
+ if (err)
+ goto error;
+ } else
+ dst_hold(&rt->u.dst);
+ }
+
+ dst_prev->child = &rt->u.dst;
+ dst->path = &rt->u.dst;
+
+ *dst_p = dst;
+ dst = dst_prev;
+
+ dst_prev = *dst_p;
+ i = 0;
+ for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
+ struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
+
+ dst_prev->xfrm = xfrm[i++];
+ dst_prev->dev = rt->u.dst.dev;
+ if (rt->u.dst.dev)
+ dev_hold(rt->u.dst.dev);
+ dst_prev->obsolete = -1;
+ dst_prev->flags |= DST_HOST;
+ dst_prev->lastuse = jiffies;
+ dst_prev->header_len = header_len;
+ dst_prev->trailer_len = trailer_len;
+ memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
+
+ /* Copy neighbour for reachability confirmation */
+ dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
+ dst_prev->input = rt->u.dst.input;
+ dst_prev->output = xfrm6_output;
+ /* Sheit... I remember I did this right. Apparently,
+ * it was magically lost, so this code needs audit */
+ x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
+ x->u.rt6.rt6i_metric = rt0->rt6i_metric;
+ x->u.rt6.rt6i_node = rt0->rt6i_node;
+ x->u.rt6.rt6i_gateway = rt0->rt6i_gateway;
+ memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway));
+ x->u.rt6.rt6i_dst = rt0->rt6i_dst;
+ x->u.rt6.rt6i_src = rt0->rt6i_src;
+ header_len -= x->u.dst.xfrm->props.header_len;
+ trailer_len -= x->u.dst.xfrm->props.trailer_len;
+ }
+
+ xfrm_init_pmtu(dst);
+ return 0;
+
+error:
+ if (dst)
+ dst_free(dst);
+ return err;
+}
+
+static inline void
+_decode_session6(struct sk_buff *skb, struct flowi *fl)
+{
+ u16 offset = sizeof(struct ipv6hdr);
+ struct ipv6hdr *hdr = skb->nh.ipv6h;
+ struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
+ u8 nexthdr = skb->nh.ipv6h->nexthdr;
+
+ memset(fl, 0, sizeof(struct flowi));
+ ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
+ ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
+
+ while (pskb_may_pull(skb, skb->nh.raw + offset + 1 - skb->data)) {
+ switch (nexthdr) {
+ case NEXTHDR_ROUTING:
+ case NEXTHDR_HOP:
+ case NEXTHDR_DEST:
+ offset += ipv6_optlen(exthdr);
+ nexthdr = exthdr->nexthdr;
+ exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
+ break;
+
+ case IPPROTO_UDP:
+ case IPPROTO_TCP:
+ case IPPROTO_SCTP:
+ if (pskb_may_pull(skb, skb->nh.raw + offset + 4 - skb->data)) {
+ u16 *ports = (u16 *)exthdr;
+
+ fl->fl_ip_sport = ports[0];
+ fl->fl_ip_dport = ports[1];
+ }
+ fl->proto = nexthdr;
+ return;
+
+ case IPPROTO_ICMPV6:
+ if (pskb_may_pull(skb, skb->nh.raw + offset + 2 - skb->data)) {
+ u8 *icmp = (u8 *)exthdr;
+
+ fl->fl_icmp_type = icmp[0];
+ fl->fl_icmp_code = icmp[1];
+ }
+ fl->proto = nexthdr;
+ return;
+
+ /* XXX Why are there these headers? */
+ case IPPROTO_AH:
+ case IPPROTO_ESP:
+ case IPPROTO_COMP:
+ default:
+ fl->fl_ipsec_spi = 0;
+ fl->proto = nexthdr;
+ return;
+ };
+ }
+}
+
+static inline int xfrm6_garbage_collect(void)
+{
+ read_lock(&xfrm6_policy_afinfo.lock);
+ xfrm6_policy_afinfo.garbage_collect();
+ read_unlock(&xfrm6_policy_afinfo.lock);
+ return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
+}
+
+static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
+{
+ struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+ struct dst_entry *path = xdst->route;
+
+ path->ops->update_pmtu(path, mtu);
+}
+
+static struct dst_ops xfrm6_dst_ops = {
+ .family = AF_INET6,
+ .protocol = __constant_htons(ETH_P_IPV6),
+ .gc = xfrm6_garbage_collect,
+ .update_pmtu = xfrm6_update_pmtu,
+ .gc_thresh = 1024,
+ .entry_size = sizeof(struct xfrm_dst),
+};
+
+static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
+ .family = AF_INET6,
+ .lock = RW_LOCK_UNLOCKED,
+ .type_map = &xfrm6_type_map,
+ .dst_ops = &xfrm6_dst_ops,
+ .dst_lookup = xfrm6_dst_lookup,
+ .find_bundle = __xfrm6_find_bundle,
+ .bundle_create = __xfrm6_bundle_create,
+ .decode_session = _decode_session6,
+};
+
+static void __init xfrm6_policy_init(void)
+{
+ xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
+}
+
+static void xfrm6_policy_fini(void)
+{
+ xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
+}
+
+void __init xfrm6_init(void)
+{
+ xfrm6_policy_init();
+ xfrm6_state_init();
+}
+
+void xfrm6_fini(void)
+{
+ //xfrm6_input_fini();
+ xfrm6_policy_fini();
+ xfrm6_state_fini();
+}