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| author | Pravin B Shelar <pshelar@nicira.com> | 2013-02-22 08:30:30 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-02-25 21:47:41 +0100 |
| commit | 490ab08127cebc25e3a260a74556b56ce5f47c0f (patch) | |
| tree | 61a662927a56a72ae7d567728edae1ce2bc9c8c5 /include/net/ipip.h | |
| parent | Merge branch 'wireless' (diff) | |
| download | linux-490ab08127cebc25e3a260a74556b56ce5f47c0f.tar.xz linux-490ab08127cebc25e3a260a74556b56ce5f47c0f.zip | |
IP_GRE: Fix IP-Identification.
GRE-GSO generates ip fragments with id 0,2,3,4... for every
GSO packet, which is not correct. Following patch fixes it
by setting ip-header id unique id of fragments are allowed.
As Eric Dumazet suggested it is optimized by using inner ip-header
whenever inner packet is ipv4.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/ipip.h')
| -rw-r--r-- | include/net/ipip.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/net/ipip.h b/include/net/ipip.h index 21947cf4fa46..fd19625ff99d 100644 --- a/include/net/ipip.h +++ b/include/net/ipip.h @@ -71,4 +71,21 @@ static inline void iptunnel_xmit(struct sk_buff *skb, struct net_device *dev) } } +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); + + if (iph->frag_off & htons(IP_DF)) + iph->id = 0; + else { + /* 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); + } +} #endif |