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Hardcode the loopback rx/tx checkum options for IPv6 to on without

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checking. This allows the FreeBSD 9.1 release process to move forward.
Work around the problem that loopback connections to local addresses
not on loopback interfaces and not on interfaces w/ IPv6 checksum offloading
enabled would not work.
A proper fix to allow us to disable the "checksum offload" on loopback
for testing, measurements, ... as we allow for IPv4 needs to put in
place later.

Reported by:	tuexen, Matthew Seaman (m.seaman infracaninophile.co.uk)
Reported by:	Mike Andrews (mandrews bit0.com), kib, ...
PR:		kern/170070
MFC after:	1 day
X-MFC after:	re approval
This commit is contained in:
Bjoern A. Zeeb 2012-07-28 20:31:39 +00:00
parent 3388f7a926
commit 5e5c0e7980
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=238871
1 changed files with 26 additions and 2 deletions
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28
sys/net/if_loop.c
View File

@ -257,10 +257,20 @@ looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES;
break;
case AF_INET6:
#if 0
/*
* XXX-BZ for now always claim the checksum is good despite
* any interface flags. This is a workaround for 9.1-R and
* a proper solution ought to be sought later.
*/
if (ifp->if_capenable & IFCAP_RXCSUM_IPV6) {
m->m_pkthdr.csum_data = 0xffff;
m->m_pkthdr.csum_flags = LO_CSUM_SET;
}
#else
m->m_pkthdr.csum_data = 0xffff;
m->m_pkthdr.csum_flags = LO_CSUM_SET;
#endif
m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES6;
break;
case AF_IPX:
@ -446,15 +456,29 @@ loioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
ifp->if_capenable ^= IFCAP_RXCSUM;
if ((mask & IFCAP_TXCSUM) != 0)
ifp->if_capenable ^= IFCAP_TXCSUM;
if ((mask & IFCAP_RXCSUM_IPV6) != 0)
if ((mask & IFCAP_RXCSUM_IPV6) != 0) {
#if 0
ifp->if_capenable ^= IFCAP_RXCSUM_IPV6;
if ((mask & IFCAP_TXCSUM_IPV6) != 0)
#else
error = EOPNOTSUPP;
break;
#endif
}
if ((mask & IFCAP_TXCSUM_IPV6) != 0) {
#if 0
ifp->if_capenable ^= IFCAP_TXCSUM_IPV6;
#else
error = EOPNOTSUPP;
break;
#endif
}
ifp->if_hwassist = 0;
if (ifp->if_capenable & IFCAP_TXCSUM)
ifp->if_hwassist = LO_CSUM_FEATURES;
#if 0
if (ifp->if_capenable & IFCAP_TXCSUM_IPV6)
ifp->if_hwassist |= LO_CSUM_FEATURES6;
#endif
break;
default: