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Two more fixes to if_detach. These are generic to all interfaces and

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do not pollute the interface further.

o Run if_detach at splnet().
o Creatively swipe the relevant parts of the netatm atm_nif_detach
  which will delete the relevant references to the interface going
  away.
This commit is contained in:
Warner Losh 1999-12-17 06:46:07 +00:00
parent b4e03744ff
commit 5500d3bedf
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=54728
1 changed files with 63 additions and 2 deletions
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65
sys/net/if.c
View File

@ -53,6 +53,7 @@
#include <net/if.h>
#include <net/if_dl.h>
#include <net/radix.h>
#include <net/route.h>
#ifdef INET6
/*XXX*/
@ -68,6 +69,7 @@ static void ifinit __P((void *));
static void if_qflush __P((struct ifqueue *));
static void if_slowtimo __P((void *));
static void link_rtrequest __P((int, struct rtentry *, struct sockaddr *));
static int if_rtdel __P((struct radix_node *, void *));
SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL)
@ -217,10 +219,14 @@ if_detach(ifp)
struct ifnet *ifp;
{
struct ifaddr *ifa;
struct radix_node_head *rnh;
int s;
int i;
/*
* Remove routes and flush queues.
*/
s = splnet();
if_down(ifp);
/*
@ -233,7 +239,6 @@ if_detach(ifp)
for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
ifa = TAILQ_FIRST(&ifp->if_addrhead)) {
#if 1 /* ONOE */
/* XXX: Ugly!! ad hoc just for INET */
if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
struct ifaliasreq ifr;
@ -247,12 +252,68 @@ if_detach(ifp)
NULL) == 0)
continue;
}
#endif /* ONOE */
TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
IFAFREE(ifa);
}
/*
* Delete all remaining routes using this interface
* Unfortuneatly the only way to do this is to slog through
* the entire routing table looking for routes which point
* to this interface...oh well...
*/
for (i = 1; i <= AF_MAX; i++) {
if ((rnh = rt_tables[i]) == NULL)
continue;
(void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
}
TAILQ_REMOVE(&ifnet, ifp, if_link);
splx(s);
}
/*
* Delete Routes for a Network Interface
*
* Called for each routing entry via the rnh->rnh_walktree() call above
* to delete all route entries referencing a detaching network interface.
*
* Arguments:
* rn pointer to node in the routing table
* arg argument passed to rnh->rnh_walktree() - detaching interface
*
* Returns:
* 0 successful
* errno failed - reason indicated
*
*/
static int
if_rtdel(rn, arg)
struct radix_node *rn;
void *arg;
{
struct rtentry *rt = (struct rtentry *)rn;
struct ifnet *ifp = arg;
int err;
if (rt->rt_ifp == ifp) {
/*
* Protect (sorta) against walktree recursion problems
* with cloned routes
*/
if ((rt->rt_flags & RTF_UP) == 0)
return (0);
err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
rt_mask(rt), rt->rt_flags,
(struct rtentry **) NULL);
if (err) {
log(LOG_WARNING, "if_rtdel: error %d\n", err);
}
}
return (0);
}
/*