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| author | gnn <gnn@FreeBSD.org> | 2008-08-29 20:42:58 +0000 |
|---|---|---|
| committer | gnn <gnn@FreeBSD.org> | 2008-08-29 20:42:58 +0000 |
| commit | 995cb3f198bb469899d5ef7e11e6cd165dbcc0cb (patch) | |
| tree | 40db23e57efcab29fb2c87aacf825ae75e18fc36 /sys/netinet/ip_output.c | |
| parent | a19823099f34807d93a12ef647b3c95cec43f793 (diff) | |
| download | FreeBSD-src-995cb3f198bb469899d5ef7e11e6cd165dbcc0cb.zip FreeBSD-src-995cb3f198bb469899d5ef7e11e6cd165dbcc0cb.tar.gz | |
Fix a bug whereby multicast packets that are looped back locally
wind up with the incorrect checksum on the wire when transmitted via
devices that do checksum offloading.
PR: kern/119635
Reviewed by: rwatson
MFC after: 5 days
Diffstat (limited to 'sys/netinet/ip_output.c')
| -rw-r--r-- | sys/netinet/ip_output.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sys/netinet/ip_output.c b/sys/netinet/ip_output.c index 88e18a1..4567f05 100644 --- a/sys/netinet/ip_output.c +++ b/sys/netinet/ip_output.c @@ -1146,7 +1146,11 @@ ip_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in *dst, register struct ip *ip; struct mbuf *copym; - copym = m_copy(m, 0, M_COPYALL); + /* + * Make a deep copy of the packet because we're going to + * modify the pack in order to generate checksums. + */ + copym = m_dup(m, M_DONTWAIT); if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen)) copym = m_pullup(copym, hlen); if (copym != NULL) { |
