svn commit: r344281 - stable/12/sys/netinet

[Kristof Provost]

Author: kp
Date: Tue Feb 19 18:22:55 2019
New Revision: 344281
URL: https://svnweb.freebsd.org/changeset/base/344281

Log:
  MFC r344061:
  
  garp: Fix vnet related panic for gratuitous arp
  
  Gratuitous ARP packets are sent from a timer, which means we don't have a vnet
  context set. As a result we panic trying to send the packet.
  
  Set the vnet context based on the interface associated with the interface
  address.
  
  To reproduce:
  sysctl net.link.ether.inet.garp_rexmit_count=2
  ifconfig vtnet1 10.0.0.1/24 up
  
  PR:		235699
  Reviewed by:	vangyzen@

Modified:
  stable/12/sys/netinet/if_ether.c
Directory Properties:
  stable/12/   (props changed)

Modified: stable/12/sys/netinet/if_ether.c
==============================================================================
--- stable/12/sys/netinet/if_ether.c	Tue Feb 19 17:38:24 2019	(r344280)
+++ stable/12/sys/netinet/if_ether.c	Tue Feb 19 18:22:55 2019	(r344281)
@@ -1345,6 +1345,8 @@ garp_rexmit(void *arg)
 		return;
 	}
 
+	CURVNET_SET(ia->ia_ifa.ifa_ifp->if_vnet);
+
 	/*
 	 * Drop lock while the ARP request is generated.
 	 */
@@ -1372,6 +1374,8 @@ garp_rexmit(void *arg)
 			ifa_free(&ia->ia_ifa);
 		}
 	}
+
+	CURVNET_RESTORE();
 }
 
 /*