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fixed bug where large amounts of unidirectional UDP traffic would fill

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the interface output queue and further udp packets would be fragmented
and only partially sent - keeping the output queue full and jamming the
network, but not actually getting any real work done (because you can't
send just 'part' of a udp packet - if you fragment it, you must send
the whole thing). The fix involves adding a check to make sure that the
output queue has sufficient space for all of the fragments.
This commit is contained in:
David Greenman 1994-08-01 12:01:45 +00:00
parent b164106fa7
commit b53902964f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=1813
1 changed files with 10 additions and 0 deletions
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10
sys/netinet/ip_output.c
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@ -254,6 +254,16 @@ ip_output(m0, opt, ro, flags, imo)
if (ip->ip_src.s_addr == INADDR_ANY)
ip->ip_src = IA_SIN(ia)->sin_addr;
#endif
/*
* Verify that we have any chance at all of being able to queue
* the packet or packet fragments
*/
if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >=
ifp->if_snd.ifq_maxlen) {
error = ENOBUFS;
goto bad;
}
/*
* Look for broadcast address and
* and verify user is allowed to send