diff options
| author | Bill Sommerfeld <wsommerfeld@google.com> | 2011-07-19 15:22:33 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-07-21 21:31:41 -0700 |
| commit | d9be4f7a6f5a8da3133b832eca41c3591420b1ca (patch) | |
| tree | 438012f22c81f3d109849a12a14acfbcf5bb9837 /net/ipv4 | |
| parent | 2e66f55b3afa290337a47e6ea134ac071c5dd9a7 (diff) | |
| download | lwn-d9be4f7a6f5a8da3133b832eca41c3591420b1ca.tar.gz lwn-d9be4f7a6f5a8da3133b832eca41c3591420b1ca.zip | |
ipv4: Constrain UFO fragment sizes to multiples of 8 bytes
Because the ip fragment offset field counts 8-byte chunks, ip
fragments other than the last must contain a multiple of 8 bytes of
payload. ip_ufo_append_data wasn't respecting this constraint and,
depending on the MTU and ip option sizes, could create malformed
non-final fragments.
Google-Bug-Id: 5009328
Signed-off-by: Bill Sommerfeld <wsommerfeld@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/ip_output.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index be27e609a98b..ccaaa851ab42 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -734,7 +734,7 @@ static inline int ip_ufo_append_data(struct sock *sk, int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void *from, int length, int hh_len, int fragheaderlen, - int transhdrlen, int mtu, unsigned int flags) + int transhdrlen, int maxfraglen, unsigned int flags) { struct sk_buff *skb; int err; @@ -767,7 +767,7 @@ static inline int ip_ufo_append_data(struct sock *sk, skb->csum = 0; /* specify the length of each IP datagram fragment */ - skb_shinfo(skb)->gso_size = mtu - fragheaderlen; + skb_shinfo(skb)->gso_size = maxfraglen - fragheaderlen; skb_shinfo(skb)->gso_type = SKB_GSO_UDP; __skb_queue_tail(queue, skb); } @@ -831,7 +831,7 @@ static int __ip_append_data(struct sock *sk, (rt->dst.dev->features & NETIF_F_UFO) && !rt->dst.header_len) { err = ip_ufo_append_data(sk, queue, getfrag, from, length, hh_len, fragheaderlen, transhdrlen, - mtu, flags); + maxfraglen, flags); if (err) goto error; return 0; |