Julian Elischer wrote:
So there are two possible ways a daemon might assign a fib to a socket
that it is accepting:
1/ the accept socket could take the FIB of the process.
2/ the accept socket could take the fib of the incoming SYN packet.
I chose #1, but it is possible something in changes between 6
and 7 broke the "chain of custody" for the fib.
This code is in production in 6.x based systems but was only introduced
to FreeBSD in 7.x.
The process makes a socket which inherits the fib from it.
The socket includes an INET PCB (Protocol Control Block)
which gets a copy too..
when "listen() is called and a syn comes in, a new entry is made in the
syncache code and this includes a new connection block which is supposed
to inherrit the fib number from the originating listen socket.
Eventually a new socket is created and it is supposed to inherit teh
fibnum from the syncache entry, and to copy it to the inpcb attached to it.
It's possible that somewhere this has been broken by changes.
but I don't see it right at the moment.
found one place in kern/ipc_socket.c
in sonewconn()
------
so->so_linger = head->so_linger;
so->so_state = head->so_state | SS_NOFDREF;
so->so_proto = head->so_proto;
so->so_fibnum = head->so_fibnum; <------ Add this
so->so_cred = crhold(head->so_cred);
#ifdef MAC
SOCK_LOCK(head);
mac_create_socket_from_socket(head, so);
SOCK_UNLOCK(head);
#endif
--------
and in netinet/tcp_syncache.c
in syncache_socket()
change the following:
------
inp = sotoinpcb(so);
inp->inp_inc.inc_fibnum = so->so_fibnum;
INP_WLOCK(inp);
/* Insert new socket into PCB hash list. */
------
and see if this helps
(it may not, there may be another code path I'm missing).
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