rwatson 2008-06-26 23:05:28 UTC FreeBSD src repository
Modified files: sys/net if.c if_var.h Log: SVN rev 180042 on 2008-06-26 23:05:28Z by rwatson Introduce locking around use of ifindex_table, whose use was previously unsynchronized. While races were extremely rare, we've now had a couple of reports of panics in environments involving large numbers of IPSEC tunnels being added very quickly on an active system. - Add accessor functions ifnet_byindex(), ifaddr_byindex(), ifdev_byindex() to replace existing accessor macros. These functions now acquire the ifnet lock before derefencing the table. - Add IFNET_WLOCK_ASSERT(). - Add static accessor functions ifnet_setbyindex(), ifdev_setbyindex(), which set values in the table either asserting of acquiring the ifnet lock. - Use accessor functions throughout if.c to modify and read ifindex_table. - Rework ifnet attach/detach to lock around ifindex_table modification. Note that these changes simply close races around use of ifindex_table, and make no attempt to solve the probem of disappearing ifnets. Further refinement of this work, including with respect to ifindex_table resizing, is still required. In a future change, the ifnet lock should be converted from a mutex to an rwlock in order to reduce contention. Reviewed and tested by: brooks Revision Changes Path 1.281 +69 -12 src/sys/net/if.c 1.119 +4 -4 src/sys/net/if_var.h _______________________________________________ cvs-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/cvs-all To unsubscribe, send any mail to "[EMAIL PROTECTED]"