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After wading in the cesspool of ip_input for an hour, I have managed to

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convince myself that nothing will break if we permit IP input while
interface addresses are unconfigured.  (At worst, they will hit some
ULP's PCB scan and fail if nobody is listening.)  So, remove the restriction
that addresses must be configured before packets can be input.  Assume
that any unicast packet we receive while unconfigured is potentially ours.
This commit is contained in:
Garrett Wollman 1999-02-09 16:55:46 +00:00
parent 73899d2e48
commit cc766e041e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=43802
1 changed files with 8 additions and 10 deletions
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18
sys/netinet/ip_input.c
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@ -31,8 +31,7 @@
* SUCH DAMAGE.
*
* @(#)ip_input.c 8.2 (Berkeley) 1/4/94
* $Id: ip_input.c,v 1.112 1999/01/22 16:50:45 wollman Exp $
* $ANA: ip_input.c,v 1.5 1996/09/18 14:34:59 wollman Exp $
* $Id: ip_input.c,v 1.113 1999/01/27 22:42:25 dillon Exp $
*/
#define _IP_VHL
@ -290,14 +289,6 @@ ip_input(struct mbuf *m)
if (m == NULL || (m->m_flags & M_PKTHDR) == 0)
panic("ip_input no HDR");
#endif
/*
* If no IP addresses have been set yet but the interfaces
* are receiving, can't do anything with incoming packets yet.
* XXX This is broken! We should be able to receive broadcasts
* and multicasts even without any local addresses configured.
*/
if (TAILQ_EMPTY(&in_ifaddrhead))
goto bad;
ipstat.ips_total++;
if (m->m_pkthdr.len < sizeof(struct ip))
@ -465,7 +456,14 @@ ip_input(struct mbuf *m)
/*
* Check our list of addresses, to see if the packet is for us.
* If we don't have any addresses, assume any unicast packet
* we receive might be for us (and let the upper layers deal
* with it).
*/
if (TAILQ_EMPTY(&in_ifaddrhead) &&
(m->m_flags & (M_MCAST|M_BCAST)) == 0)
goto ours;
for (ia = TAILQ_FIRST(&in_ifaddrhead); ia;
ia = TAILQ_NEXT(ia, ia_link)) {
#define satosin(sa) ((struct sockaddr_in *)(sa))