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Restore historical behavior of in_control, which, when no matching address

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is found, the first usable address is returned for legacy ioctls like
SIOCGIFBRDADDR, SIOCGIFDSTADDR, SIOCGIFNETMASK and SIOCGIFADDR.

While there also fix a subtle issue that a caller from a jail asking for
INADDR_ANY may get the first IP of the host that do not belong to the jail.

Submitted by:	glebius
Differential Revision: https://reviews.freebsd.org/D667
This commit is contained in:
Xin LI 2014-08-22 19:08:12 +00:00
parent 61ae650d55
commit a7f77a3950
1 changed files with 11 additions and 4 deletions
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15
sys/netinet/in.c
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@ -242,19 +242,26 @@ in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
return (EADDRNOTAVAIL);
/*
* For SIOCGIFADDR, pick the first address. For the rest of
* ioctls, try to find specified address.
* Find address for this interface, if it exists. If an
* address was specified, find that one instead of the
* first one on the interface, if possible.
*/
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
ia = (struct in_ifaddr *)ifa;
if (cmd == SIOCGIFADDR || addr->sin_addr.s_addr == INADDR_ANY)
break;
if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
break;
}
if (ifa == NULL)
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
if (ifa->ifa_addr->sa_family == AF_INET) {
ia = (struct in_ifaddr *)ifa;
if (prison_check_ip4(td->td_ucred,
&ia->ia_addr.sin_addr) == 0)
break;
}
if (ifa == NULL) {
IF_ADDR_RUNLOCK(ifp);