zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/net/ipv4/xfrm4_policy.c b/ap/os/linux/linux-3.4.x/net/ipv4/xfrm4_policy.c
new file mode 100644
index 0000000..a0b4c5d
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/ipv4/xfrm4_policy.c
@@ -0,0 +1,305 @@
+/*
+ * 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 <linux/if_tunnel.h>
+#include <net/dst.h>
+#include <net/xfrm.h>
+#include <net/ip.h>
+
+static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
+
+static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4,
+ int tos,
+ const xfrm_address_t *saddr,
+ const xfrm_address_t *daddr)
+{
+ struct rtable *rt;
+
+ memset(fl4, 0, sizeof(*fl4));
+ fl4->daddr = daddr->a4;
+ fl4->flowi4_tos = tos;
+ if (saddr)
+ fl4->saddr = saddr->a4;
+
+ rt = __ip_route_output_key(net, fl4);
+ if (!IS_ERR(rt))
+ return &rt->dst;
+
+ return ERR_CAST(rt);
+}
+
+static struct dst_entry *xfrm4_dst_lookup(struct net *net, int tos,
+ const xfrm_address_t *saddr,
+ const xfrm_address_t *daddr)
+{
+ struct flowi4 fl4;
+
+ return __xfrm4_dst_lookup(net, &fl4, tos, saddr, daddr);
+}
+
+static int xfrm4_get_saddr(struct net *net,
+ xfrm_address_t *saddr, xfrm_address_t *daddr)
+{
+ struct dst_entry *dst;
+ struct flowi4 fl4;
+
+ dst = __xfrm4_dst_lookup(net, &fl4, 0, NULL, daddr);
+ if (IS_ERR(dst))
+ return -EHOSTUNREACH;
+
+ saddr->a4 = fl4.saddr;
+ dst_release(dst);
+ return 0;
+}
+
+static int xfrm4_get_tos(const struct flowi *fl)
+{
+ return IPTOS_RT_MASK & fl->u.ip4.flowi4_tos; /* Strip ECN bits */
+}
+
+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,
+ const struct flowi *fl)
+{
+ struct rtable *rt = (struct rtable *)xdst->route;
+ const struct flowi4 *fl4 = &fl->u.ip4;
+
+ xdst->u.rt.rt_key_dst = fl4->daddr;
+ xdst->u.rt.rt_key_src = fl4->saddr;
+ xdst->u.rt.rt_key_tos = fl4->flowi4_tos;
+ xdst->u.rt.rt_route_iif = fl4->flowi4_iif;
+ xdst->u.rt.rt_iif = fl4->flowi4_iif;
+ xdst->u.rt.rt_oif = fl4->flowi4_oif;
+ xdst->u.rt.rt_mark = fl4->flowi4_mark;
+
+ xdst->u.dst.dev = dev;
+ dev_hold(dev);
+
+ 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)
+{
+ const struct iphdr *iph = ip_hdr(skb);
+ u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
+ struct flowi4 *fl4 = &fl->u.ip4;
+
+ memset(fl4, 0, sizeof(struct flowi4));
+ fl4->flowi4_mark = skb->mark;
+
+ if (!ip_is_fragment(iph)) {
+ switch (iph->protocol) {
+ case IPPROTO_UDP:
+ case IPPROTO_UDPLITE:
+ case IPPROTO_TCP:
+ case IPPROTO_SCTP:
+ case IPPROTO_DCCP:
+ if (xprth + 4 < skb->data ||
+ pskb_may_pull(skb, xprth + 4 - skb->data)) {
+ __be16 *ports = (__be16 *)xprth;
+
+ fl4->fl4_sport = ports[!!reverse];
+ fl4->fl4_dport = ports[!reverse];
+ }
+ break;
+
+ case IPPROTO_ICMP:
+ if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
+ u8 *icmp = xprth;
+
+ fl4->fl4_icmp_type = icmp[0];
+ fl4->fl4_icmp_code = icmp[1];
+ }
+ break;
+
+ case IPPROTO_ESP:
+ if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
+ __be32 *ehdr = (__be32 *)xprth;
+
+ fl4->fl4_ipsec_spi = ehdr[0];
+ }
+ break;
+
+ case IPPROTO_AH:
+ if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
+ __be32 *ah_hdr = (__be32*)xprth;
+
+ fl4->fl4_ipsec_spi = ah_hdr[1];
+ }
+ break;
+
+ case IPPROTO_COMP:
+ if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
+ __be16 *ipcomp_hdr = (__be16 *)xprth;
+
+ fl4->fl4_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
+ }
+ break;
+
+ case IPPROTO_GRE:
+ if (pskb_may_pull(skb, xprth + 12 - skb->data)) {
+ __be16 *greflags = (__be16 *)xprth;
+ __be32 *gre_hdr = (__be32 *)xprth;
+
+ if (greflags[0] & GRE_KEY) {
+ if (greflags[0] & GRE_CSUM)
+ gre_hdr++;
+ fl4->fl4_gre_key = gre_hdr[1];
+ }
+ }
+ break;
+
+ default:
+ fl4->fl4_ipsec_spi = 0;
+ break;
+ }
+ }
+ fl4->flowi4_proto = iph->protocol;
+ fl4->daddr = reverse ? iph->saddr : iph->daddr;
+ fl4->saddr = reverse ? iph->daddr : iph->saddr;
+ fl4->flowi4_tos = iph->tos;
+}
+
+static inline int xfrm4_garbage_collect(struct dst_ops *ops)
+{
+ struct net *net = container_of(ops, struct net, xfrm.xfrm4_dst_ops);
+
+ xfrm4_policy_afinfo.garbage_collect(net);
+ return (dst_entries_get_slow(ops) > 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;
+
+ dst_destroy_metrics_generic(dst);
+
+ 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)
+{
+ if (!unregister)
+ return;
+
+ xfrm_dst_ifdown(dst, dev);
+}
+
+static struct dst_ops xfrm4_dst_ops = {
+ .family = AF_INET,
+ .protocol = cpu_to_be16(ETH_P_IP),
+ .gc = xfrm4_garbage_collect,
+ .update_pmtu = xfrm4_update_pmtu,
+ .cow_metrics = dst_cow_metrics_generic,
+ .destroy = xfrm4_dst_destroy,
+ .ifdown = xfrm4_dst_ifdown,
+ .local_out = __ip_local_out,
+ .gc_thresh = 1024,
+};
+
+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,
+ .decode_session = _decode_session4,
+ .get_tos = xfrm4_get_tos,
+ .init_path = xfrm4_init_path,
+ .fill_dst = xfrm4_fill_dst,
+ .blackhole_route = ipv4_blackhole_route,
+};
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table xfrm4_policy_table[] = {
+ {
+ .procname = "xfrm4_gc_thresh",
+ .data = &init_net.xfrm.xfrm4_dst_ops.gc_thresh,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ { }
+};
+
+static struct ctl_table_header *sysctl_hdr;
+#endif
+
+static void __init xfrm4_policy_init(void)
+{
+ xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
+}
+
+static void __exit xfrm4_policy_fini(void)
+{
+#ifdef CONFIG_SYSCTL
+ if (sysctl_hdr)
+ unregister_net_sysctl_table(sysctl_hdr);
+#endif
+ xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
+}
+
+void __init xfrm4_init(int rt_max_size)
+{
+ /*
+ * Select a default value for the gc_thresh based on the main route
+ * table hash size. It seems to me the worst case scenario is when
+ * we have ipsec operating in transport mode, in which we create a
+ * dst_entry per socket. The xfrm gc algorithm starts trying to remove
+ * entries at gc_thresh, and prevents new allocations as 2*gc_thresh
+ * so lets set an initial xfrm gc_thresh value at the rt_max_size/2.
+ * That will let us store an ipsec connection per route table entry,
+ * and start cleaning when were 1/2 full
+ */
+ xfrm4_dst_ops.gc_thresh = rt_max_size/2;
+ dst_entries_init(&xfrm4_dst_ops);
+
+ xfrm4_state_init();
+ xfrm4_policy_init();
+#ifdef CONFIG_SYSCTL
+ sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv4_ctl_path,
+ xfrm4_policy_table);
+#endif
+}
+