src/sys/netinet6, branch release/9.3.0

MFC r257555:

2014-05-14T17:16:49Z

Changes from upstream to improve compilation when INET or INET6 or none of them is defined.

MFC r264582:

2014-04-24T11:13:38Z

Remove unused variable. PR: 173521

MFC r264364:

2014-04-21T11:24:01Z

Properly release the in6_multi lock. Sponsored by: Yandex LLC

MFC r263969,263971:

2014-04-07T12:59:17Z

Don't generate an ICMPv6 error message if packet was consumed by filter. Remove unused label. Sponsored by: Yandex LLC

MFC: r261710

2014-03-12T08:16:17Z

Only count table lookups when we're actually processing packets. PR: 183462 Submitted by: Sven-Thorsten Dietrich Reviewed by: bms

MFC r261835:

2014-02-20T21:02:24Z

Drop packets to multicast address whose scop field contains the reserved value 0. Sponsored by: Yandex LLC

MFC r261400:

2014-02-10T16:13:45Z

Take exclusive lock only when lle isn't NULL. We don't need write access to lle in most cases. MFC r261583: Unlock entry before retry. Sponsored by: Yandex LLC

MFC r260485,260496:

2014-01-28T00:31:48Z

Remove extra nesting from X_ip6_mforward() function. Also remove disabled definitions from ip6_mroute.h. PR: 185148

MFC r260481:

2014-01-16T13:24:58Z

Add MRT6_DLOG() macro for debugging. Reduce number of MRT6DEBUG ifdefs and fix some broken format strings.

MFC r260151 (by adrian):

2014-01-10T12:22:49Z

Use an RLOCK here instead of an RWLOCK - matching all the other calls to lla_lookup(). This drastically reduces the very high lock contention when doing parallel TCP throughput tests (> 1024 sockets) with IPv6. MFC r260187: lla_lookup() does modification only when LLE_CREATE is specified. Thus we can use IF_AFDATA_RLOCK() instead of IF_AFDATA_LOCK() when doing lla_lookup() without LLE_CREATE flag. MFC r260217: Add IF_AFDATA_WLOCK_ASSERT() in case lla_lookup() is called with LLE_CREATE flag.