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Slightly rearrange validation of UDP arguments and jail processing in

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udp_output() so that argument validation occurs before jail processing.

Add additional comments explaining what's going on when we process
addresses and binding during udp_output().

MFC after:	3 weeks
This commit is contained in:
Robert Watson 2008-07-10 16:20:18 +00:00
parent 2efc107abe
commit 3144b7d3d3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=180429
1 changed files with 25 additions and 4 deletions
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29
sys/netinet/udp_usrreq.c
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@ -1,6 +1,7 @@
/*-
* Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
* The Regents of the University of California.
* Copyright (c) 2008 Robert N. M. Watson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -875,17 +876,37 @@ udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
goto release;
}
/*
* If a UDP socket has been connected, then a local address/port will
* have been selected and bound.
*
* If a UDP socket has not been connect to, then an explicit
* destination address must be used, in which case a local
* address/port may not have been selected and bound.
*/
if (addr) {
INP_INFO_LOCK_ASSERT(&udbinfo);
INP_LOCK_ASSERT(inp);
sin = (struct sockaddr_in *)addr;
if (jailed(td->td_ucred))
prison_remote_ip(td->td_ucred, 0,
&sin->sin_addr.s_addr);
if (inp->inp_faddr.s_addr != INADDR_ANY) {
error = EISCONN;
goto release;
}
/*
* Jail may rewrite the destination address, so let it do
* that before we use it.
*/
sin = (struct sockaddr_in *)addr;
if (jailed(td->td_ucred))
prison_remote_ip(td->td_ucred, 0,
&sin->sin_addr.s_addr);
/*
* If a local address or port hasn't yet been selected, do
* that now. Once a port is selected, we commit the binding
* back to the socket; we also commit the binding of the
* address if in jail.
*/
error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, &lport,
&faddr.s_addr, &fport, NULL, td->td_ucred);
if (error)