Changes primary addr selection on BSD to respect SIOCGIFADDR ioctl() result.

Thanks to Alexander V. Chernikov for the original patch.

sysdep/bsd/krt-sock.c

@@ -1058,3 +1058,36 @@ kif_sys_shutdown(struct kif_proto *p)
   krt_buffer_release(&p->p);
 }
 
+
+struct ifa *
+kif_get_primary_ip(struct iface *i)
+{
+#ifndef IPV6
+  static int fd = -1;
+  
+  if (fd < 0)
+    fd = socket(AF_INET, SOCK_DGRAM, 0);
+
+  struct ifreq ifr;
+  memset(&ifr, 0, sizeof(ifr));
+  strncpy(ifr.ifr_name, i->name, IFNAMSIZ);
+
+  int rv = ioctl(fd, SIOCGIFADDR, (char *) &ifr);
+  if (rv < 0)
+    return NULL;
+
+  ip_addr addr;
+  struct sockaddr_in *sin = (struct sockaddr_in *) &ifr.ifr_addr;
+  memcpy(&addr, &sin->sin_addr.s_addr, sizeof(ip_addr));
+  ipa_ntoh(addr);
+
+  struct ifa *a;
+  WALK_LIST(a, i->addrs)
+  {
+    if (ipa_equal(a->ip, addr))
+      return a;
+  }
+#endif
+
+  return NULL;
+}

sysdep/linux/krt-sys.h

@@ -27,6 +27,8 @@ static inline void kif_sys_postconfig(struct kif_config *c UNUSED) { }
 static inline void kif_sys_init_config(struct kif_config *c UNUSED) { }
 static inline void kif_sys_copy_config(struct kif_config *d UNUSED, struct kif_config *s UNUSED) { }
 
+static inline struct ifa * kif_get_primary_ip(struct iface *i) { return NULL; }
+
 
 /* Kernel routes */
 

sysdep/unix/krt.c

@@ -159,6 +159,9 @@ kif_choose_primary(struct iface *i)
 	  return a;
     }
 
+  if (a = kif_get_primary_ip(i))
+    return a;
+
   return find_preferred_ifa(i, IPA_NONE, IPA_NONE);
 }
 

sysdep/unix/krt.h

@@ -142,5 +142,6 @@ void kif_sys_copy_config(struct kif_config *, struct kif_config *);
 
 void kif_do_scan(struct kif_proto *);
 
+struct ifa *kif_get_primary_ip(struct iface *i);
 
 #endif