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authorWilliam Tu <u9012063@gmail.com>2018-05-11 15:49:47 +0300
committerDavid S. Miller <davem@davemloft.net>2018-05-11 23:03:49 +0300
commitd5db21a3e6977dcb42cee3d16cd69901fa66510a (patch)
tree02531f421723d9954ab3a3013e44e864890c6449 /net/ipv6/ip6_gre.c
parent755bbc1c0071c6ac6e893e6aaf79728728758b3e (diff)
downloadlinux-d5db21a3e6977dcb42cee3d16cd69901fa66510a.tar.xz
erspan: auto detect truncated ipv6 packets.
Currently the truncated bit is set only when 1) the mirrored packet is larger than mtu and 2) the ipv4 packet tot_len is larger than the actual skb->len. This patch adds another case for detecting whether ipv6 packet is truncated or not, by checking the ipv6 header payload_len and the skb->len. Reported-by: Xiaoyan Jin <xiaoyanj@vmware.com> Signed-off-by: William Tu <u9012063@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ip6_gre.c')
-rw-r--r--net/ipv6/ip6_gre.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index b511818b268c..bede77f24784 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -897,6 +897,7 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
int err = -EINVAL;
__u32 mtu;
int nhoff;
+ int thoff;
if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
goto tx_err;
@@ -914,6 +915,11 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
(ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
truncate = true;
+ thoff = skb_transport_header(skb) - skb_mac_header(skb);
+ if (skb->protocol == htons(ETH_P_IPV6) &&
+ (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
+ truncate = true;
+
if (skb_cow_head(skb, dev->needed_headroom))
goto tx_err;