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ip_tunnel: Do not use inner ip-header-id for tunnel ip-header-id. 

[ Upstream commit 4221f40513233fa8edeef7fc82e44163fde03b9b ]

Using inner-id for tunnel id is not safe in some rare cases.
E.g. packets coming from multiple sources entering same tunnel
can have same id. Therefore on tunnel packet receive we
could have packets from two different stream but with same
source and dst IP with same ip-id which could confuse ip packet
reassembly.

Following patch reverts optimization from commit
490ab08127 (IP_GRE: Fix IP-Identification.)

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
CC: Jarno Rajahalme <jrajahalme@nicira.com>
CC: Ansis Atteka <aatteka@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pravin B Shelar 2013-08-13 01:41:06 -07:00 committed by Greg Kroah-Hartman
parent a8077ef001
commit e8d1167877
3 changed files with 2 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/vxlan.c
View File

@ -1090,7 +1090,7 @@ static netdev_tx_t vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
iph->daddr = dst;
iph->saddr = fl4.saddr;
iph->ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
tunnel_ip_select_ident(skb, old_iph, &rt->dst);
__ip_select_ident(iph, &rt->dst, (skb_shinfo(skb)->gso_segs ?: 1) - 1);
nf_reset(skb);

14
include/net/ip_tunnels.h
View File

@ -141,20 +141,6 @@ static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
return INET_ECN_encapsulate(tos, inner);
}
static inline void tunnel_ip_select_ident(struct sk_buff *skb,
const struct iphdr *old_iph,
struct dst_entry *dst)
{
struct iphdr *iph = ip_hdr(skb);
/* Use inner packet iph-id if possible. */
if (skb->protocol == htons(ETH_P_IP) && old_iph->id)
iph->id = old_iph->id;
else
__ip_select_ident(iph, dst,
(skb_shinfo(skb)->gso_segs ?: 1) - 1);
}
static inline void iptunnel_xmit(struct sk_buff *skb, struct net_device *dev)
{
int err;

2
net/ipv4/ip_tunnel.c
View File

@ -686,7 +686,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
iph->daddr = fl4.daddr;
iph->saddr = fl4.saddr;
iph->ttl = ttl;
tunnel_ip_select_ident(skb, inner_iph, &rt->dst);
__ip_select_ident(iph, &rt->dst, (skb_shinfo(skb)->gso_segs ?: 1) - 1);
iptunnel_xmit(skb, dev);
return;