d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

fixed bug where large amounts of unidirectional UDP traffic would fill

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
sys/netinet/ip_output.c
View File

@ -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