Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ipv4 / xfrm4_mode_tunnel.c

diff --git a/kernel/net/ipv4/xfrm4_mode_tunnel.c b/kernel/net/ipv4/xfrm4_mode_tunnel.c
new file mode 100644 (file)
index 0000000..35feda6
--- /dev/null
+++ b/kernel/net/ipv4/xfrm4_mode_tunnel.c
@@ -0,0 +1,125 @@
+/*
+ * xfrm4_mode_tunnel.c - Tunnel mode encapsulation for IPv4.
+ *
+ * Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+
+#include <linux/gfp.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/stringify.h>
+#include <net/dst.h>
+#include <net/inet_ecn.h>
+#include <net/ip.h>
+#include <net/xfrm.h>
+
+static inline void ipip_ecn_decapsulate(struct sk_buff *skb)
+{
+       struct iphdr *inner_iph = ipip_hdr(skb);
+
+       if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
+               IP_ECN_set_ce(inner_iph);
+}
+
+/* Add encapsulation header.
+ *
+ * The top IP header will be constructed per RFC 2401.
+ */
+static int xfrm4_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+       struct dst_entry *dst = skb_dst(skb);
+       struct iphdr *top_iph;
+       int flags;
+
+       skb_set_network_header(skb, -x->props.header_len);
+       skb->mac_header = skb->network_header +
+                         offsetof(struct iphdr, protocol);
+       skb->transport_header = skb->network_header + sizeof(*top_iph);
+       top_iph = ip_hdr(skb);
+
+       top_iph->ihl = 5;
+       top_iph->version = 4;
+
+       top_iph->protocol = xfrm_af2proto(skb_dst(skb)->ops->family);
+
+       /* DS disclosing depends on XFRM_SA_XFLAG_DONT_ENCAP_DSCP */
+       if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
+               top_iph->tos = 0;
+       else
+               top_iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
+       top_iph->tos = INET_ECN_encapsulate(top_iph->tos,
+                                           XFRM_MODE_SKB_CB(skb)->tos);
+
+       flags = x->props.flags;
+       if (flags & XFRM_STATE_NOECN)
+               IP_ECN_clear(top_iph);
+
+       top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ?
+               0 : (XFRM_MODE_SKB_CB(skb)->frag_off & htons(IP_DF));
+
+       top_iph->ttl = ip4_dst_hoplimit(dst->child);
+
+       top_iph->saddr = x->props.saddr.a4;
+       top_iph->daddr = x->id.daddr.a4;
+       ip_select_ident(dev_net(dst->dev), skb, NULL);
+
+       return 0;
+}
+
+static int xfrm4_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+       int err = -EINVAL;
+
+       if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP)
+               goto out;
+
+       if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+               goto out;
+
+       err = skb_unclone(skb, GFP_ATOMIC);
+       if (err)
+               goto out;
+
+       if (x->props.flags & XFRM_STATE_DECAP_DSCP)
+               ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb));
+       if (!(x->props.flags & XFRM_STATE_NOECN))
+               ipip_ecn_decapsulate(skb);
+
+       skb_reset_network_header(skb);
+       skb_mac_header_rebuild(skb);
+
+       err = 0;
+
+out:
+       return err;
+}
+
+static struct xfrm_mode xfrm4_tunnel_mode = {
+       .input2 = xfrm4_mode_tunnel_input,
+       .input = xfrm_prepare_input,
+       .output2 = xfrm4_mode_tunnel_output,
+       .output = xfrm4_prepare_output,
+       .owner = THIS_MODULE,
+       .encap = XFRM_MODE_TUNNEL,
+       .flags = XFRM_MODE_FLAG_TUNNEL,
+};
+
+static int __init xfrm4_mode_tunnel_init(void)
+{
+       return xfrm_register_mode(&xfrm4_tunnel_mode, AF_INET);
+}
+
+static void __exit xfrm4_mode_tunnel_exit(void)
+{
+       int err;
+
+       err = xfrm_unregister_mode(&xfrm4_tunnel_mode, AF_INET);
+       BUG_ON(err);
+}
+
+module_init(xfrm4_mode_tunnel_init);
+module_exit(xfrm4_mode_tunnel_exit);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_XFRM_MODE(AF_INET, XFRM_MODE_TUNNEL);