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Diffstat (limited to 'net/ipv4/ip_tunnel_core.c')
-rw-r--r--net/ipv4/ip_tunnel_core.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
new file mode 100644
index 000000000000..7167b08977df
--- /dev/null
+++ b/net/ipv4/ip_tunnel_core.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2013 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/in.h>
+#include <linux/if_arp.h>
+#include <linux/mroute.h>
+#include <linux/init.h>
+#include <linux/in6.h>
+#include <linux/inetdevice.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/protocol.h>
+#include <net/ip_tunnels.h>
+#include <net/arp.h>
+#include <net/checksum.h>
+#include <net/dsfield.h>
+#include <net/inet_ecn.h>
+#include <net/xfrm.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <net/rtnetlink.h>
+
+int iptunnel_xmit(struct net *net, struct rtable *rt,
+ struct sk_buff *skb,
+ __be32 src, __be32 dst, __u8 proto,
+ __u8 tos, __u8 ttl, __be16 df)
+{
+ int pkt_len = skb->len;
+ struct iphdr *iph;
+ int err;
+
+ nf_reset(skb);
+ secpath_reset(skb);
+ skb->rxhash = 0;
+ skb_dst_drop(skb);
+ skb_dst_set(skb, &rt->dst);
+ memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
+
+ /* Push down and install the IP header. */
+ __skb_push(skb, sizeof(struct iphdr));
+ skb_reset_network_header(skb);
+
+ iph = ip_hdr(skb);
+
+ iph->version = 4;
+ iph->ihl = sizeof(struct iphdr) >> 2;
+ iph->frag_off = df;
+ iph->protocol = proto;
+ iph->tos = tos;
+ iph->daddr = dst;
+ iph->saddr = src;
+ iph->ttl = ttl;
+ tunnel_ip_select_ident(skb,
+ (const struct iphdr *)skb_inner_network_header(skb),
+ &rt->dst);
+
+ err = ip_local_out(skb);
+ if (unlikely(net_xmit_eval(err)))
+ pkt_len = 0;
+ return pkt_len;
+}
+EXPORT_SYMBOL_GPL(iptunnel_xmit);
+
+int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto)
+{
+ if (unlikely(!pskb_may_pull(skb, hdr_len)))
+ return -ENOMEM;
+
+ skb_pull_rcsum(skb, hdr_len);
+
+ if (inner_proto == htons(ETH_P_TEB)) {
+ struct ethhdr *eh = (struct ethhdr *)skb->data;
+
+ if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
+ return -ENOMEM;
+
+ if (likely(ntohs(eh->h_proto) >= ETH_P_802_3_MIN))
+ skb->protocol = eh->h_proto;
+ else
+ skb->protocol = htons(ETH_P_802_2);
+
+ } else {
+ skb->protocol = inner_proto;
+ }
+
+ nf_reset(skb);
+ secpath_reset(skb);
+ if (!skb->l4_rxhash)
+ skb->rxhash = 0;
+ skb_dst_drop(skb);
+ skb->vlan_tci = 0;
+ skb_set_queue_mapping(skb, 0);
+ skb->pkt_type = PACKET_HOST;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(iptunnel_pull_header);