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| author | Edward Hyunkoo Jee <edjee@google.com> | 2015-07-21 09:43:59 +0200 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2015-08-12 16:33:22 +0200 |
| commit | 8c3d7424eb960448262e12d888f8093a39548c91 (patch) | |
| tree | f336b0b343b34f3510404b9e6aad31712da27cf1 /net | |
| parent | 77f807e34765258d91104c61f2a3bf64d4c3477b (diff) | |
| download | kernel_samsung_smdk4412-8c3d7424eb960448262e12d888f8093a39548c91.zip kernel_samsung_smdk4412-8c3d7424eb960448262e12d888f8093a39548c91.tar.gz kernel_samsung_smdk4412-8c3d7424eb960448262e12d888f8093a39548c91.tar.bz2 | |
inet: frags: fix defragmented packet's IP header for af_packet
commit 0848f6428ba3a2e42db124d41ac6f548655735bf upstream.
When ip_frag_queue() computes positions, it assumes that the passed
sk_buff does not contain L2 headers.
However, when PACKET_FANOUT_FLAG_DEFRAG is used, IP reassembly
functions can be called on outgoing packets that contain L2 headers.
Also, IPv4 checksum is not corrected after reassembly.
Fixes: 7736d33f4262 ("packet: Add pre-defragmentation support for ipv4 fanouts.")
Signed-off-by: Edward Hyunkoo Jee <edjee@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Jerry Chu <hkchu@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/ip_fragment.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c index 16e25a4..c20c356 100644 --- a/net/ipv4/ip_fragment.c +++ b/net/ipv4/ip_fragment.c @@ -385,7 +385,7 @@ static int ip_frag_queue(struct ipq *qp, struct sk_buff *skb) ihl = ip_hdrlen(skb); /* Determine the position of this fragment. */ - end = offset + skb->len - ihl; + end = offset + skb->len - skb_network_offset(skb) - ihl; err = -EINVAL; /* Is this the final fragment? */ @@ -415,7 +415,7 @@ static int ip_frag_queue(struct ipq *qp, struct sk_buff *skb) goto err; err = -ENOMEM; - if (pskb_pull(skb, ihl) == NULL) + if (!pskb_pull(skb, skb_network_offset(skb) + ihl)) goto err; err = pskb_trim_rcsum(skb, end - offset); @@ -638,6 +638,8 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev, iph->frag_off = 0; iph->tot_len = htons(len); iph->tos |= ecn; + ip_send_check(iph); + IP_INC_STATS_BH(net, IPSTATS_MIB_REASMOKS); qp->q.fragments = NULL; qp->q.fragments_tail = NULL; |