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authorHerbert Xu <herbert@gondor.apana.org.au>2008-08-03 21:15:08 -0700
committerDavid S. Miller <davem@davemloft.net>2008-08-03 21:15:08 -0700
commitf880374c2fe37aad3fa62253a4bc125d7a933aad (patch)
tree7ff62dfd04689f09c0c27b24340479fc92de5e0d /include/net
parentcfb266c0ee0ea0b7bfa8189e3a3a80344dec6112 (diff)
sctp: Drop ipfargok in sctp_xmit function
The ipfragok flag controls whether the packet may be fragmented either on the local host on beyond. The latter is only valid on IPv4. In fact, we never want to do the latter even on IPv4 when PMTU is enabled. This is because even though we can't fragment packets within SCTP due to the prtocol's inherent faults, we can still fragment it at IP layer. By setting the DF bit we will improve the PMTU process. RFC 2960 only says that we SHOULD clear the DF bit in this case, so we're compliant even if we set the DF bit. In fact RFC 4960 no longer has this statement. Once we make this change, we only need to control the local fragmentation. There is already a bit in the skb which controls that, local_df. So this patch sets that instead of using the ipfragok argument. The only complication is that there isn't a struct sock object per transport, so for IPv4 we have to resort to changing the pmtudisc field for every packet. This should be safe though as the protocol is single-threaded. Note that after this patch we can remove ipfragok from the rest of the stack too. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/sctp/structs.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 535a18f57a1..ab1c472ea75 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -524,8 +524,7 @@ static inline void sctp_ssn_skip(struct sctp_stream *stream, __u16 id,
*/
struct sctp_af {
int (*sctp_xmit) (struct sk_buff *skb,
- struct sctp_transport *,
- int ipfragok);
+ struct sctp_transport *);
int (*setsockopt) (struct sock *sk,
int level,
int optname,