3d7b46cd20
Process skb tunnel header before sending packet to protocol handler. this allows code sharing between gre and ovs gre modules. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
122 lines
3 KiB
C
122 lines
3 KiB
C
/*
|
|
* 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);
|