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ip_mroute: fix the viftable export sysctl

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It seems that in r354857 I got more than one thing wrong.
Convert the SYSCTL_OPAQUE to a SYSCTL_PROC to properly export the these
days allocated and not longer static per-vnet viftable array.
This fixes a problem with netstat -g which would show bogus information
for the IPv4 Virtual Interface Table.

PR:		246626
Reported by:	Ozkan KIRIK (ozkan.kirik gmail.com)
MFC after:	3 days
This commit is contained in:
Bjoern A. Zeeb 2020-10-11 00:01:00 +00:00
parent f8e8a06d23
commit 506512b170
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=366623
1 changed files with 24 additions and 7 deletions
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31
sys/netinet/ip_mroute.c
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@ -181,13 +181,6 @@ VNET_DEFINE_STATIC(vifi_t, numvifs);
#define V_numvifs VNET(numvifs)
VNET_DEFINE_STATIC(struct vif *, viftable);
#define V_viftable VNET(viftable)
/*
* No one should be able to "query" this before initialisation happened in
* vnet_mroute_init(), so we should still be fine.
*/
SYSCTL_OPAQUE(_net_inet_ip, OID_AUTO, viftable, CTLFLAG_VNET | CTLFLAG_RD,
&VNET_NAME(viftable), sizeof(*V_viftable) * MAXVIFS, "S,vif[MAXVIFS]",
"IPv4 Multicast Interfaces (struct vif[MAXVIFS], netinet/ip_mroute.h)");
static struct mtx vif_mtx;
#define VIF_LOCK() mtx_lock(&vif_mtx)
@ -2806,6 +2799,30 @@ static SYSCTL_NODE(_net_inet_ip, OID_AUTO, mfctable,
"IPv4 Multicast Forwarding Table "
"(struct *mfc[mfchashsize], netinet/ip_mroute.h)");
static int
sysctl_viflist(SYSCTL_HANDLER_ARGS)
{
int error;
if (req->newptr)
return (EPERM);
if (V_viftable == NULL) /* XXX unlocked */
return (0);
error = sysctl_wire_old_buffer(req, sizeof(*V_viftable) * MAXVIFS);
if (error)
return (error);
VIF_LOCK();
error = SYSCTL_OUT(req, V_viftable, sizeof(*V_viftable) * MAXVIFS);
VIF_UNLOCK();
return (error);
}
SYSCTL_PROC(_net_inet_ip, OID_AUTO, viftable,
CTLTYPE_OPAQUE | CTLFLAG_VNET | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
sysctl_viflist, "S,vif[MAXVIFS]",
"IPv4 Multicast Interfaces (struct vif[MAXVIFS], netinet/ip_mroute.h)");
static void
vnet_mroute_init(const void *unused __unused)
{