Many changes in I/O and OSPF sockets and packet handling.

I/O:
 - BSD: specify src addr on IP sockets by IP_HDRINCL
 - BSD: specify src addr on UDP sockets by IP_SENDSRCADDR
 - Linux: specify src addr on IP/UDP sockets by IP_PKTINFO
 - IPv6: specify src addr on IP/UDP sockets by IPV6_PKTINFO
 - Alternative SKF_BIND flag for binding to IP address
 - Allows IP/UDP sockets without tx_hook, on these
   sockets a packet is discarded when TX queue is full
 - Use consistently SOL_ for socket layer values.

OSPF:
 - Packet src addr is always explicitly set
 - Support for secondary addresses in BSD
 - Dynamic RX/TX buffers
 - Fixes some minor buffer overruns
 - Interface option 'tx length'
 - Names for vlink pseudoifaces (vlinkX)
 - Vlinks use separate socket for TX
 - Vlinks do not use fixed associated iface
 - Fixes TTL for direct unicast packets
 - Fixes DONTROUTE for OSPF sockets
 - Use ifa->ifname instead of ifa->iface->name

1 files changed, 10 insertions, 7 deletions

diff --git a/lib/resource.c b/lib/resource.c
index bf4b3ae9..64f9a39c 100644
--- a/lib/resource.c
+++ b/lib/resource.c
@@ -157,13 +157,13 @@ rfree(void *res)
 {
   resource *r = res;
 
-  if (r)
-    {
-      if (r->n.next)
-	rem_node(&r->n);
-      r->class->free(r);
-      xfree(r);
-    }
+  if (!r)
+    return;
+
+  if (r->n.next)
+    rem_node(&r->n);
+  r->class->free(r);
+  xfree(r);
 }
 
 /**
@@ -408,6 +408,9 @@ mb_realloc(void *m, unsigned size)
 void
 mb_free(void *m)
 {
+  if (!m)
+    return;
+
   struct mblock *b = SKIP_BACK(struct mblock, data, m);
   rfree(b);
 }