diff options
| author | Michał Mirosław <mirq-linux@rere.qmqm.pl> | 2011-07-13 14:10:29 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-07-14 15:16:31 -0700 |
| commit | b73c43f884b1b26ef8e824a33f3924f92e493c11 (patch) | |
| tree | 83b71863345ef94720c00b4d7aedc387d3eee8c7 /net/sctp/output.c | |
| parent | 51414d41084496aaefd06d7f19eb8206e8bfac2d (diff) | |
| download | linux-b73c43f884b1b26ef8e824a33f3924f92e493c11.tar.gz linux-b73c43f884b1b26ef8e824a33f3924f92e493c11.tar.bz2 linux-b73c43f884b1b26ef8e824a33f3924f92e493c11.zip | |
net: sctp: fix checksum marking for outgoing packets
Packets to devices without NETIF_F_SCTP_CSUM (including NETIF_F_NO_CSUM)
should be properly checksummed because the packets can be diverted or
rerouted after construction. This still leaves packets diverted from
NETIF_F_SCTP_CSUM-enabled devices with broken checksums. Fixing this
needs implementing software offload fallback in networking core.
For users of sctp_checksum_disable, skb->ip_summed should be left as
CHECKSUM_NONE and not CHECKSUM_UNNECESSARY as per include/linux/skbuff.h.
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/output.c')
| -rw-r--r-- | net/sctp/output.c | 19 |
1 files changed, 8 insertions, 11 deletions
diff --git a/net/sctp/output.c b/net/sctp/output.c index b4f3cf06d8da..08b3cead6503 100644 --- a/net/sctp/output.c +++ b/net/sctp/output.c @@ -500,23 +500,20 @@ int sctp_packet_transmit(struct sctp_packet *packet) * Note: Adler-32 is no longer applicable, as has been replaced * by CRC32-C as described in <draft-ietf-tsvwg-sctpcsum-02.txt>. */ - if (!sctp_checksum_disable && - !(dst->dev->features & (NETIF_F_NO_CSUM | NETIF_F_SCTP_CSUM))) { - __u32 crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len); + if (!sctp_checksum_disable) { + if (!(dst->dev->features & NETIF_F_SCTP_CSUM)) { + __u32 crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len); - /* 3) Put the resultant value into the checksum field in the - * common header, and leave the rest of the bits unchanged. - */ - sh->checksum = sctp_end_cksum(crc32); - } else { - if (dst->dev->features & NETIF_F_SCTP_CSUM) { + /* 3) Put the resultant value into the checksum field in the + * common header, and leave the rest of the bits unchanged. + */ + sh->checksum = sctp_end_cksum(crc32); + } else { /* no need to seed pseudo checksum for SCTP */ nskb->ip_summed = CHECKSUM_PARTIAL; nskb->csum_start = (skb_transport_header(nskb) - nskb->head); nskb->csum_offset = offsetof(struct sctphdr, checksum); - } else { - nskb->ip_summed = CHECKSUM_UNNECESSARY; } } |