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Fix IP_SENDSRCADDR semantics.

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* To use this option with a UDP socket, it must be bound to a local port,
   and INADDR_ANY, to disallow possible collisions with existing udp inpcbs
   bound to the same port on other interfaces at send time.

 * If the socket is bound to INADDR_ANY, specifying IP_SENDSRCADDR with
   INADDR_ANY will be rejected as it is ambiguous.

 * If the socket is bound to an address other than INADDR_ANY, specifying
   IP_SENDSRCADDR with INADDR_ANY will be disallowed by in_pcbbind_setup().

Reviewed by:	silence on -net
Tested with:	src/tools/regression/netinet/ipbroadcast
MFC after:	4 days
This commit is contained in:
Bruce M Simpson 2007-03-08 15:26:54 +00:00
parent 48451912c9
commit 1b7f038498
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=167342
1 changed files with 11 additions and 4 deletions
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15
sys/netinet/udp_usrreq.c
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@ -747,7 +747,7 @@ udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
return (EMSGSIZE);
}
src.sin_addr.s_addr = INADDR_ANY;
src.sin_family = 0;
if (control != NULL) {
/*
* XXX: Currently, we assume all the optional information is
@ -797,7 +797,7 @@ udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
return (error);
}
if (src.sin_addr.s_addr != INADDR_ANY || addr != NULL) {
if (src.sin_family == AF_INET || addr != NULL) {
INP_INFO_WLOCK(&udbinfo);
unlock_udbinfo = 1;
} else
@ -808,10 +808,17 @@ udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
mac_create_mbuf_from_inpcb(inp, m);
#endif
/*
* If the IP_SENDSRCADDR control message was specified, override the
* source address for this datagram. Its use is invalidated if the
* address thus specified is incomplete or clobbers other inpcbs.
*/
laddr = inp->inp_laddr;
lport = inp->inp_lport;
if (src.sin_addr.s_addr != INADDR_ANY) {
if (lport == 0) {
if (src.sin_family == AF_INET) {
if ((lport == 0) ||
(laddr.s_addr == INADDR_ANY &&
src.sin_addr.s_addr == INADDR_ANY)) {
error = EINVAL;
goto release;
}