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author | bz <bz@FreeBSD.org> | 2012-05-25 02:23:26 +0000 |
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committer | bz <bz@FreeBSD.org> | 2012-05-25 02:23:26 +0000 |
commit | 36fe475aa40328c1d04ccc35a5549fcacdb7dfad (patch) | |
tree | fc2422cd5a4f37a0bea52d726520687602518d46 /sys/netinet/tcp_syncache.c | |
parent | bc95289fae2caae23a78aa1ce4349ab438002a1f (diff) | |
download | FreeBSD-src-36fe475aa40328c1d04ccc35a5549fcacdb7dfad.zip FreeBSD-src-36fe475aa40328c1d04ccc35a5549fcacdb7dfad.tar.gz |
MFp4 bz_ipv6_fast:
Add code to handle pre-checked TCP checksums as indicated by mbuf
flags to save the entire computation for validation if not needed.
In the IPv6 TCP output path only compute the pseudo-header checksum,
set the checksum offset in the mbuf field along the appropriate flag
as done in IPv4.
In tcp_respond() just initialize the IPv6 payload length to 0 as
ip6_output() will properly set it.
Sponsored by: The FreeBSD Foundation
Sponsored by: iXsystems
Reviewed by: gnn (as part of the whole)
MFC After: 3 days
Diffstat (limited to 'sys/netinet/tcp_syncache.c')
-rw-r--r-- | sys/netinet/tcp_syncache.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/sys/netinet/tcp_syncache.c b/sys/netinet/tcp_syncache.c index 8df7ce0..fcac95f 100644 --- a/sys/netinet/tcp_syncache.c +++ b/sys/netinet/tcp_syncache.c @@ -1473,11 +1473,12 @@ syncache_respond(struct syncache *sc) optlen = 0; M_SETFIB(m, sc->sc_inc.inc_fibnum); + m->m_pkthdr.csum_flags = CSUM_TCP; + m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); #ifdef INET6 if (sc->sc_inc.inc_flags & INC_ISIPV6) { - th->th_sum = 0; - th->th_sum = in6_cksum(m, IPPROTO_TCP, hlen, - tlen + optlen - hlen); + th->th_sum = in6_cksum_pseudo(ip6, tlen + optlen - hlen, + IPPROTO_TCP, 0); ip6->ip6_hlim = in6_selecthlim(NULL, NULL); error = ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); } @@ -1489,8 +1490,6 @@ syncache_respond(struct syncache *sc) { th->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, htons(tlen + optlen - hlen + IPPROTO_TCP)); - m->m_pkthdr.csum_flags = CSUM_TCP; - m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); error = ip_output(m, sc->sc_ipopts, NULL, 0, NULL, NULL); } #endif |