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In in_ifadown(), differentiate between whether the interface goes

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down or interface address is deleted.  Only delete static routes
in the latter case.

Reported by:	Alexander Leidinger <Alexander@leidinger.net>
This commit is contained in:
Ruslan Ermilov 2001-05-11 14:37:34 +00:00
parent bf6ff2766c
commit 9185426827
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=76469
4 changed files with 15 additions and 11 deletions
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2
sys/netinet/in.c
View File

@ -421,7 +421,7 @@ in_control(so, cmd, data, ifp, p)
* thing to do, but at least if we are running
* a routing process they will come back.
*/
in_ifadown(&ia->ia_ifa);
in_ifadown(&ia->ia_ifa, 1);
/*
* Protect from ipintr() traversing address list

20
sys/netinet/in_rmx.c
View File

@ -369,16 +369,18 @@ in_inithead(void **head, int off)
/*
* This zaps old routes (including ARP entries) when the interface
* address is deleted. Previously it didn't delete static routes,
* and this caused some weird things to happen. In particular, if
* you changed the address on an interface, and the default route
* was using this interface and address, outgoing datagrams still
* used the old address.
* This zaps old routes when the interface goes down or interface
* address is deleted. In the latter case, it deletes static routes
* that point to this address. If we don't do this, we may end up
* using the old address in the future. The ones we always want to
* get rid of are things like ARP entries, since the user might down
* the interface, walk over to a completely different network, and
* plug back in.
*/
struct in_ifadown_arg {
struct radix_node_head *rnh;
struct ifaddr *ifa;
int del;
};
static int
@ -388,7 +390,8 @@ in_ifadownkill(struct radix_node *rn, void *xap)
struct rtentry *rt = (struct rtentry *)rn;
int err;
if (rt->rt_ifa == ap->ifa) {
if (rt->rt_ifa == ap->ifa &&
(ap->del || !(rt->rt_flags & RTF_STATIC))) {
/*
* We need to disable the automatic prune that happens
* in this case in rtrequest() because it will blow
@ -408,7 +411,7 @@ in_ifadownkill(struct radix_node *rn, void *xap)
}
int
in_ifadown(struct ifaddr *ifa)
in_ifadown(struct ifaddr *ifa, int delete)
{
struct in_ifadown_arg arg;
struct radix_node_head *rnh;
@ -418,6 +421,7 @@ in_ifadown(struct ifaddr *ifa)
arg.rnh = rnh = rt_tables[AF_INET];
arg.ifa = ifa;
arg.del = delete;
rnh->rnh_walktree(rnh, in_ifadownkill, &arg);
ifa->ifa_flags &= ~IFA_ROUTE;
return 0;

2
sys/netinet/in_var.h
View File

@ -221,7 +221,7 @@ int in_control __P((struct socket *, u_long, caddr_t, struct ifnet *,
struct proc *));
void in_rtqdrain __P((void));
void ip_input __P((struct mbuf *));
int in_ifadown __P((struct ifaddr *ifa));
int in_ifadown __P((struct ifaddr *ifa, int));
void in_ifscrub __P((struct ifnet *, struct in_ifaddr *));
int ipflow_fastforward __P((struct mbuf *));
void ipflow_create __P((const struct route *, struct mbuf *));

2
sys/netinet/raw_ip.c
View File

@ -398,7 +398,7 @@ rip_ctlinput(cmd, sa, vip)
* thing to do, but at least if we are running
* a routing process they will come back.
*/
in_ifadown(&ia->ia_ifa);
in_ifadown(&ia->ia_ifa, 0);
break;
}
}