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authorSridhar Samudrala <sri@us.ibm.com>2006-06-18 09:57:28 +0400
committerDavid S. Miller <davem@davemloft.net>2006-06-18 09:57:28 +0400
commit503b55fd77d11381b1950d1651d3bc782c0cc2cd (patch)
treea960542bcc10b97218a601a94e56e579595c0a2c /net/sctp/output.c
parent4c9f5d5305a23851e67471b147e0d459a7166717 (diff)
downloadlinux-503b55fd77d11381b1950d1651d3bc782c0cc2cd.tar.xz
[SCTP]: Don't do CRC32C checksum over loopback.
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/output.c')
-rw-r--r--net/sctp/output.c48
1 files changed, 27 insertions, 21 deletions
diff --git a/net/sctp/output.c b/net/sctp/output.c
index 437cba7260a4..cdc5a3936766 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -295,14 +295,14 @@ int sctp_packet_transmit(struct sctp_packet *packet)
struct sctp_transport *tp = packet->transport;
struct sctp_association *asoc = tp->asoc;
struct sctphdr *sh;
- __u32 crc32;
+ __u32 crc32 = 0;
struct sk_buff *nskb;
struct sctp_chunk *chunk, *tmp;
struct sock *sk;
int err = 0;
int padding; /* How much padding do we need? */
__u8 has_data = 0;
- struct dst_entry *dst;
+ struct dst_entry *dst = tp->dst;
SCTP_DEBUG_PRINTK("%s: packet:%p\n", __FUNCTION__, packet);
@@ -327,6 +327,19 @@ int sctp_packet_transmit(struct sctp_packet *packet)
*/
skb_set_owner_w(nskb, sk);
+ /* The 'obsolete' field of dst is set to 2 when a dst is freed. */
+ if (!dst || (dst->obsolete > 1)) {
+ dst_release(dst);
+ sctp_transport_route(tp, NULL, sctp_sk(sk));
+ if (asoc && (asoc->param_flags & SPP_PMTUD_ENABLE)) {
+ sctp_assoc_sync_pmtu(asoc);
+ }
+ }
+ nskb->dst = dst_clone(tp->dst);
+ if (!nskb->dst)
+ goto no_route;
+ dst = nskb->dst;
+
/* Build the SCTP header. */
sh = (struct sctphdr *)skb_push(nskb, sizeof(struct sctphdr));
sh->source = htons(packet->source_port);
@@ -350,7 +363,8 @@ 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* Note: Adler-32 is no longer applicable, as has been replaced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>.
*/
- crc32 = sctp_start_cksum((__u8 *)sh, sizeof(struct sctphdr));
+ if (!(dst->dev->features & NETIF_F_NO_CSUM))
+ crc32 = sctp_start_cksum((__u8 *)sh, sizeof(struct sctphdr));
/**
* 6.10 Bundling
@@ -402,9 +416,14 @@ int sctp_packet_transmit(struct sctp_packet *packet)
if (padding)
memset(skb_put(chunk->skb, padding), 0, padding);
- crc32 = sctp_update_copy_cksum(skb_put(nskb, chunk->skb->len),
- chunk->skb->data,
- chunk->skb->len, crc32);
+ if (dst->dev->features & NETIF_F_NO_CSUM)
+ memcpy(skb_put(nskb, chunk->skb->len),
+ chunk->skb->data, chunk->skb->len);
+ else
+ crc32 = sctp_update_copy_cksum(skb_put(nskb,
+ chunk->skb->len),
+ chunk->skb->data,
+ chunk->skb->len, crc32);
SCTP_DEBUG_PRINTK("%s %p[%s] %s 0x%x, %s %d, %s %d, %s %d\n",
"*** Chunk", chunk,
@@ -427,7 +446,8 @@ int sctp_packet_transmit(struct sctp_packet *packet)
}
/* Perform final transformation on checksum. */
- crc32 = sctp_end_cksum(crc32);
+ if (!(dst->dev->features & NETIF_F_NO_CSUM))
+ crc32 = sctp_end_cksum(crc32);
/* 3) Put the resultant value into the checksum field in the
* common header, and leave the rest of the bits unchanged.
@@ -477,20 +497,6 @@ int sctp_packet_transmit(struct sctp_packet *packet)
}
}
- dst = tp->dst;
- /* The 'obsolete' field of dst is set to 2 when a dst is freed. */
- if (!dst || (dst->obsolete > 1)) {
- dst_release(dst);
- sctp_transport_route(tp, NULL, sctp_sk(sk));
- if (asoc->param_flags & SPP_PMTUD_ENABLE) {
- sctp_assoc_sync_pmtu(asoc);
- }
- }
-
- nskb->dst = dst_clone(tp->dst);
- if (!nskb->dst)
- goto no_route;
-
SCTP_DEBUG_PRINTK("***sctp_transmit_packet*** skb len %d\n",
nskb->len);