Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ipv6 / xfrm6_output.c

diff --git a/kernel/net/ipv6/xfrm6_output.c b/kernel/net/ipv6/xfrm6_output.c
new file mode 100644 (file)
index 0000000..09c76a7
--- /dev/null
+++ b/kernel/net/ipv6/xfrm6_output.c
@@ -0,0 +1,174 @@
+/*
+ * xfrm6_output.c - Common IPsec encapsulation code for IPv6.
+ * Copyright (C) 2002 USAGI/WIDE Project
+ * Copyright (c) 2004 Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/if_ether.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/icmpv6.h>
+#include <linux/netfilter_ipv6.h>
+#include <net/dst.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/xfrm.h>
+
+int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
+                         u8 **prevhdr)
+{
+       return ip6_find_1stfragopt(skb, prevhdr);
+}
+EXPORT_SYMBOL(xfrm6_find_1stfragopt);
+
+static int xfrm6_local_dontfrag(struct sk_buff *skb)
+{
+       int proto;
+       struct sock *sk = skb->sk;
+
+       if (sk) {
+               if (sk->sk_family != AF_INET6)
+                       return 0;
+
+               proto = sk->sk_protocol;
+               if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
+                       return inet6_sk(sk)->dontfrag;
+       }
+
+       return 0;
+}
+
+static void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu)
+{
+       struct flowi6 fl6;
+       struct sock *sk = skb->sk;
+
+       fl6.flowi6_oif = sk->sk_bound_dev_if;
+       fl6.daddr = ipv6_hdr(skb)->daddr;
+
+       ipv6_local_rxpmtu(sk, &fl6, mtu);
+}
+
+void xfrm6_local_error(struct sk_buff *skb, u32 mtu)
+{
+       struct flowi6 fl6;
+       const struct ipv6hdr *hdr;
+       struct sock *sk = skb->sk;
+
+       hdr = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);
+       fl6.fl6_dport = inet_sk(sk)->inet_dport;
+       fl6.daddr = hdr->daddr;
+
+       ipv6_local_error(sk, EMSGSIZE, &fl6, mtu);
+}
+
+static int xfrm6_tunnel_check_size(struct sk_buff *skb)
+{
+       int mtu, ret = 0;
+       struct dst_entry *dst = skb_dst(skb);
+
+       mtu = dst_mtu(dst);
+       if (mtu < IPV6_MIN_MTU)
+               mtu = IPV6_MIN_MTU;
+
+       if (!skb->ignore_df && skb->len > mtu) {
+               skb->dev = dst->dev;
+
+               if (xfrm6_local_dontfrag(skb))
+                       xfrm6_local_rxpmtu(skb, mtu);
+               else if (skb->sk)
+                       xfrm_local_error(skb, mtu);
+               else
+                       icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+               ret = -EMSGSIZE;
+       }
+
+       return ret;
+}
+
+int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+       int err;
+
+       err = xfrm6_tunnel_check_size(skb);
+       if (err)
+               return err;
+
+       XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr;
+
+       return xfrm6_extract_header(skb);
+}
+
+int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+       int err;
+
+       err = xfrm_inner_extract_output(x, skb);
+       if (err)
+               return err;
+
+       skb->ignore_df = 1;
+       skb->protocol = htons(ETH_P_IPV6);
+
+       return x->outer_mode->output2(x, skb);
+}
+EXPORT_SYMBOL(xfrm6_prepare_output);
+
+int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb)
+{
+       memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
+
+#ifdef CONFIG_NETFILTER
+       IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
+#endif
+
+       return xfrm_output(sk, skb);
+}
+
+static int __xfrm6_output(struct sock *sk, struct sk_buff *skb)
+{
+       struct dst_entry *dst = skb_dst(skb);
+       struct xfrm_state *x = dst->xfrm;
+       int mtu;
+
+#ifdef CONFIG_NETFILTER
+       if (!x) {
+               IP6CB(skb)->flags |= IP6SKB_REROUTED;
+               return dst_output_sk(sk, skb);
+       }
+#endif
+
+       if (skb->protocol == htons(ETH_P_IPV6))
+               mtu = ip6_skb_dst_mtu(skb);
+       else
+               mtu = dst_mtu(skb_dst(skb));
+
+       if (skb->len > mtu && xfrm6_local_dontfrag(skb)) {
+               xfrm6_local_rxpmtu(skb, mtu);
+               return -EMSGSIZE;
+       } else if (!skb->ignore_df && skb->len > mtu && skb->sk) {
+               xfrm_local_error(skb, mtu);
+               return -EMSGSIZE;
+       }
+
+       if (x->props.mode == XFRM_MODE_TUNNEL &&
+           ((skb->len > mtu && !skb_is_gso(skb)) ||
+               dst_allfrag(skb_dst(skb)))) {
+               return ip6_fragment(sk, skb,
+                                   x->outer_mode->afinfo->output_finish);
+       }
+       return x->outer_mode->afinfo->output_finish(sk, skb);
+}
+
+int xfrm6_output(struct sock *sk, struct sk_buff *skb)
+{
+       return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, sk, skb,
+                           NULL, skb_dst(skb)->dev, __xfrm6_output,
+                           !(IP6CB(skb)->flags & IP6SKB_REROUTED));
+}