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-rw-r--r--net/ipv4/xfrm4_policy.c280
1 files changed, 280 insertions, 0 deletions
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
new file mode 100644
index 0000000..c63de0a
--- /dev/null
+++ b/net/ipv4/xfrm4_policy.c
@@ -0,0 +1,280 @@
+/*
+ * xfrm4_policy.c
+ *
+ * Changes:
+ * Kazunori MIYAZAWA @USAGI
+ * YOSHIFUJI Hideaki @USAGI
+ * Split up af-specific portion
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/inetdevice.h>
+#include <net/dst.h>
+#include <net/xfrm.h>
+#include <net/ip.h>
+
+static struct dst_ops xfrm4_dst_ops;
+static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
+
+static struct dst_entry *xfrm4_dst_lookup(int tos, xfrm_address_t *saddr,
+ xfrm_address_t *daddr)
+{
+ struct flowi fl = {
+ .nl_u = {
+ .ip4_u = {
+ .tos = tos,
+ .daddr = daddr->a4,
+ },
+ },
+ };
+ struct dst_entry *dst;
+ struct rtable *rt;
+ int err;
+
+ if (saddr)
+ fl.fl4_src = saddr->a4;
+
+ err = __ip_route_output_key(&init_net, &rt, &fl);
+ dst = &rt->u.dst;
+ if (err)
+ dst = ERR_PTR(err);
+ return dst;
+}
+
+static int xfrm4_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
+{
+ struct dst_entry *dst;
+ struct rtable *rt;
+
+ dst = xfrm4_dst_lookup(0, NULL, daddr);
+ if (IS_ERR(dst))
+ return -EHOSTUNREACH;
+
+ rt = (struct rtable *)dst;
+ saddr->a4 = rt->rt_src;
+ dst_release(dst);
+ return 0;
+}
+
+static struct dst_entry *
+__xfrm4_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
+{
+ struct dst_entry *dst;
+
+ read_lock_bh(&policy->lock);
+ for (dst = policy->bundles; dst; dst = dst->next) {
+ struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
+ if (xdst->u.rt.fl.oif == fl->oif && /*XXX*/
+ xdst->u.rt.fl.fl4_dst == fl->fl4_dst &&
+ xdst->u.rt.fl.fl4_src == fl->fl4_src &&
+ xdst->u.rt.fl.fl4_tos == fl->fl4_tos &&
+ xfrm_bundle_ok(policy, xdst, fl, AF_INET, 0)) {
+ dst_clone(dst);
+ break;
+ }
+ }
+ read_unlock_bh(&policy->lock);
+ return dst;
+}
+
+static int xfrm4_get_tos(struct flowi *fl)
+{
+ return fl->fl4_tos;
+}
+
+static int xfrm4_init_path(struct xfrm_dst *path, struct dst_entry *dst,
+ int nfheader_len)
+{
+ return 0;
+}
+
+static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
+{
+ struct rtable *rt = (struct rtable *)xdst->route;
+
+ xdst->u.rt.fl = rt->fl;
+
+ xdst->u.dst.dev = dev;
+ dev_hold(dev);
+
+ xdst->u.rt.idev = in_dev_get(dev);
+ if (!xdst->u.rt.idev)
+ return -ENODEV;
+
+ xdst->u.rt.peer = rt->peer;
+ if (rt->peer)
+ atomic_inc(&rt->peer->refcnt);
+
+ /* Sheit... I remember I did this right. Apparently,
+ * it was magically lost, so this code needs audit */
+ xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
+ RTCF_LOCAL);
+ xdst->u.rt.rt_type = rt->rt_type;
+ xdst->u.rt.rt_src = rt->rt_src;
+ xdst->u.rt.rt_dst = rt->rt_dst;
+ xdst->u.rt.rt_gateway = rt->rt_gateway;
+ xdst->u.rt.rt_spec_dst = rt->rt_spec_dst;
+
+ return 0;
+}
+
+static void
+_decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
+{
+ struct iphdr *iph = ip_hdr(skb);
+ u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
+
+ memset(fl, 0, sizeof(struct flowi));
+ if (!(iph->frag_off & htons(IP_MF | IP_OFFSET))) {
+ switch (iph->protocol) {
+ case IPPROTO_UDP:
+ case IPPROTO_UDPLITE:
+ case IPPROTO_TCP:
+ case IPPROTO_SCTP:
+ case IPPROTO_DCCP:
+ if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
+ __be16 *ports = (__be16 *)xprth;
+
+ fl->fl_ip_sport = ports[!!reverse];
+ fl->fl_ip_dport = ports[!reverse];
+ }
+ break;
+
+ case IPPROTO_ICMP:
+ if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
+ u8 *icmp = xprth;
+
+ fl->fl_icmp_type = icmp[0];
+ fl->fl_icmp_code = icmp[1];
+ }
+ break;
+
+ case IPPROTO_ESP:
+ if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
+ __be32 *ehdr = (__be32 *)xprth;
+
+ fl->fl_ipsec_spi = ehdr[0];
+ }
+ break;
+
+ case IPPROTO_AH:
+ if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
+ __be32 *ah_hdr = (__be32*)xprth;
+
+ fl->fl_ipsec_spi = ah_hdr[1];
+ }
+ break;
+
+ case IPPROTO_COMP:
+ if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
+ __be16 *ipcomp_hdr = (__be16 *)xprth;
+
+ fl->fl_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
+ }
+ break;
+ default:
+ fl->fl_ipsec_spi = 0;
+ break;
+ }
+ }
+ fl->proto = iph->protocol;
+ fl->fl4_dst = reverse ? iph->saddr : iph->daddr;
+ fl->fl4_src = reverse ? iph->daddr : iph->saddr;
+ fl->fl4_tos = iph->tos;
+}
+
+static inline int xfrm4_garbage_collect(struct dst_ops *ops)
+{
+ xfrm4_policy_afinfo.garbage_collect();
+ return (atomic_read(&xfrm4_dst_ops.entries) > xfrm4_dst_ops.gc_thresh*2);
+}
+
+static void xfrm4_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 void xfrm4_dst_destroy(struct dst_entry *dst)
+{
+ struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+
+ if (likely(xdst->u.rt.idev))
+ in_dev_put(xdst->u.rt.idev);
+ if (likely(xdst->u.rt.peer))
+ inet_putpeer(xdst->u.rt.peer);
+ xfrm_dst_destroy(xdst);
+}
+
+static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
+ int unregister)
+{
+ struct xfrm_dst *xdst;
+
+ if (!unregister)
+ return;
+
+ xdst = (struct xfrm_dst *)dst;
+ if (xdst->u.rt.idev->dev == dev) {
+ struct in_device *loopback_idev =
+ in_dev_get(dev_net(dev)->loopback_dev);
+ BUG_ON(!loopback_idev);
+
+ do {
+ in_dev_put(xdst->u.rt.idev);
+ xdst->u.rt.idev = loopback_idev;
+ in_dev_hold(loopback_idev);
+ xdst = (struct xfrm_dst *)xdst->u.dst.child;
+ } while (xdst->u.dst.xfrm);
+
+ __in_dev_put(loopback_idev);
+ }
+
+ xfrm_dst_ifdown(dst, dev);
+}
+
+static struct dst_ops xfrm4_dst_ops = {
+ .family = AF_INET,
+ .protocol = __constant_htons(ETH_P_IP),
+ .gc = xfrm4_garbage_collect,
+ .update_pmtu = xfrm4_update_pmtu,
+ .destroy = xfrm4_dst_destroy,
+ .ifdown = xfrm4_dst_ifdown,
+ .local_out = __ip_local_out,
+ .gc_thresh = 1024,
+ .entry_size = sizeof(struct xfrm_dst),
+ .entries = ATOMIC_INIT(0),
+};
+
+static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
+ .family = AF_INET,
+ .dst_ops = &xfrm4_dst_ops,
+ .dst_lookup = xfrm4_dst_lookup,
+ .get_saddr = xfrm4_get_saddr,
+ .find_bundle = __xfrm4_find_bundle,
+ .decode_session = _decode_session4,
+ .get_tos = xfrm4_get_tos,
+ .init_path = xfrm4_init_path,
+ .fill_dst = xfrm4_fill_dst,
+};
+
+static void __init xfrm4_policy_init(void)
+{
+ xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
+}
+
+static void __exit xfrm4_policy_fini(void)
+{
+ xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
+}
+
+void __init xfrm4_init(void)
+{
+ xfrm4_state_init();
+ xfrm4_policy_init();
+}
+
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