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Fix PR 59: don't allow TCP connections withmulticast addresses at either

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end.
This commit is contained in:
Garrett Wollman 1994-12-15 20:39:34 +00:00
parent 58328669a3
commit 9ee39fc64d
1 changed files with 22 additions and 1 deletions
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23
sys/netinet/tcp_usrreq.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
* $Id: tcp_usrreq.c,v 1.4 1994/08/02 07:49:15 davidg Exp $
* $Id: tcp_usrreq.c,v 1.5 1994/09/15 10:36:56 davidg Exp $
*/
#include <sys/param.h>
@ -81,6 +81,7 @@ tcp_usrreq(so, req, m, nam, control)
{
register struct inpcb *inp;
register struct tcpcb *tp = 0;
struct sockaddr_in *sinp;
int s;
int error = 0;
int ostate;
@ -152,6 +153,16 @@ tcp_usrreq(so, req, m, nam, control)
* Give the socket an address.
*/
case PRU_BIND:
/*
* Must check for multicast addresses and disallow binding
* to them.
*/
sinp = mtod(nam, struct sockaddr_in *);
if (sinp->sin_family == AF_INET &&
IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
error = EAFNOSUPPORT;
break;
}
error = in_pcbbind(inp, nam);
if (error)
break;
@ -175,6 +186,16 @@ tcp_usrreq(so, req, m, nam, control)
* Send initial segment on connection.
*/
case PRU_CONNECT:
/*
* Must disallow TCP ``connections'' to multicast addresses.
*/
sinp = mtod(nam, struct sockaddr_in *);
if (sinp->sin_family == AF_INET
&& IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
error = EAFNOSUPPORT;
break;
}
if (inp->inp_lport == 0) {
error = in_pcbbind(inp, (struct mbuf *)0);
if (error)