diff options
| author | cinap_lenrek <cinap_lenrek@felloff.net> | 2014-12-21 17:25:55 +0100 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@felloff.net> | 2014-12-21 17:25:55 +0100 |
| commit | 1db9f19b62fbf52e4b33047b536cfb0fbfdd22cb (patch) | |
| tree | 4c037ae7043d3a4c56c14ffe0516242bfcfc1d06 | |
| parent | bf049ebdb1ede563304c9255d49d47df0098a531 (diff) | |
ip: exclude "don't fragment" bit from ipv4 reassembly test
other operating systems always set the "don't fragment" bit
in ther outgoing ipv4 packets causing us to unnecesarily
call ip4reassemble() looking for a fragment reassembly queue.
the change excludes the "don't fragment" bit from the test
so we now call ip4reassemble() only when the "more fragmens"
bit is set or a fragment offset other than zero is given.
this optimization was discovered from akaros.
| -rw-r--r-- | sys/src/9/ip/ip.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/src/9/ip/ip.c b/sys/src/9/ip/ip.c index 40fc9380e..0a8863e77 100644 --- a/sys/src/9/ip/ip.c +++ b/sys/src/9/ip/ip.c @@ -405,7 +405,7 @@ ipiput4(Fs *f, Ipifc *ifc, Block *bp) if(r->ifc == nil) panic("nil route rfc"); if(r->ifc->reassemble){ frag = nhgets(h->frag); - if(frag) { + if(frag & ~IP_DF) { h->tos = 0; if(frag & IP_MF) h->tos = 1; @@ -424,7 +424,7 @@ if(r->ifc == nil) panic("nil route rfc"); } frag = nhgets(h->frag); - if(frag) { + if(frag & ~IP_DF) { h->tos = 0; if(frag & IP_MF) h->tos = 1; |