Merge branch 'for-3.11' of git://linux-nfs.org/~bfields/linux
[linux-2.6.git] / net / ipv4 / ip_tunnel_core.c
blob7167b08977df582bd38565cf960568a8553f29d4
1 /*
2 * Copyright (c) 2013 Nicira, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21 #include <linux/types.h>
22 #include <linux/kernel.h>
23 #include <linux/skbuff.h>
24 #include <linux/netdevice.h>
25 #include <linux/in.h>
26 #include <linux/if_arp.h>
27 #include <linux/mroute.h>
28 #include <linux/init.h>
29 #include <linux/in6.h>
30 #include <linux/inetdevice.h>
31 #include <linux/netfilter_ipv4.h>
32 #include <linux/etherdevice.h>
33 #include <linux/if_ether.h>
34 #include <linux/if_vlan.h>
36 #include <net/ip.h>
37 #include <net/icmp.h>
38 #include <net/protocol.h>
39 #include <net/ip_tunnels.h>
40 #include <net/arp.h>
41 #include <net/checksum.h>
42 #include <net/dsfield.h>
43 #include <net/inet_ecn.h>
44 #include <net/xfrm.h>
45 #include <net/net_namespace.h>
46 #include <net/netns/generic.h>
47 #include <net/rtnetlink.h>
49 int iptunnel_xmit(struct net *net, struct rtable *rt,
50 struct sk_buff *skb,
51 __be32 src, __be32 dst, __u8 proto,
52 __u8 tos, __u8 ttl, __be16 df)
54 int pkt_len = skb->len;
55 struct iphdr *iph;
56 int err;
58 nf_reset(skb);
59 secpath_reset(skb);
60 skb->rxhash = 0;
61 skb_dst_drop(skb);
62 skb_dst_set(skb, &rt->dst);
63 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
65 /* Push down and install the IP header. */
66 __skb_push(skb, sizeof(struct iphdr));
67 skb_reset_network_header(skb);
69 iph = ip_hdr(skb);
71 iph->version = 4;
72 iph->ihl = sizeof(struct iphdr) >> 2;
73 iph->frag_off = df;
74 iph->protocol = proto;
75 iph->tos = tos;
76 iph->daddr = dst;
77 iph->saddr = src;
78 iph->ttl = ttl;
79 tunnel_ip_select_ident(skb,
80 (const struct iphdr *)skb_inner_network_header(skb),
81 &rt->dst);
83 err = ip_local_out(skb);
84 if (unlikely(net_xmit_eval(err)))
85 pkt_len = 0;
86 return pkt_len;
88 EXPORT_SYMBOL_GPL(iptunnel_xmit);
90 int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto)
92 if (unlikely(!pskb_may_pull(skb, hdr_len)))
93 return -ENOMEM;
95 skb_pull_rcsum(skb, hdr_len);
97 if (inner_proto == htons(ETH_P_TEB)) {
98 struct ethhdr *eh = (struct ethhdr *)skb->data;
100 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
101 return -ENOMEM;
103 if (likely(ntohs(eh->h_proto) >= ETH_P_802_3_MIN))
104 skb->protocol = eh->h_proto;
105 else
106 skb->protocol = htons(ETH_P_802_2);
108 } else {
109 skb->protocol = inner_proto;
112 nf_reset(skb);
113 secpath_reset(skb);
114 if (!skb->l4_rxhash)
115 skb->rxhash = 0;
116 skb_dst_drop(skb);
117 skb->vlan_tci = 0;
118 skb_set_queue_mapping(skb, 0);
119 skb->pkt_type = PACKET_HOST;
120 return 0;
122 EXPORT_SYMBOL_GPL(iptunnel_pull_header);