* device if the connection came from the local host since it
* avoids the routing table in such a case. Let's unset the
* interface index in such a case. */
- if (s->ifindex > 0 && manager_ifindex_is_loopback(s->manager, s->ifindex) != 0)
+ if (s->ifindex == LOOPBACK_IFINDEX)
s->ifindex = 0;
/* If we don't know the interface index still, we look for the
* device if the packet came from the local host since it
* avoids the routing table in such a case. Let's unset the
* interface index in such a case. */
- if (p->ifindex > 0 && manager_ifindex_is_loopback(m, p->ifindex) != 0)
+ if (p->ifindex == LOOPBACK_IFINDEX)
p->ifindex = 0;
/* If we don't know the interface index still, we look for the
return r;
}
-/* lo having ifindex 1 is hardcoded in the kernel */
-#define LOOPBACK_IFINDEX 1
-
-int manager_ifindex_is_loopback(Manager *m, int ifindex) {
- Link *l;
- assert(m);
-
- if (ifindex <= 0)
- return -EINVAL;
-
- l = hashmap_get(m->links, INT_TO_PTR(ifindex));
- if (!l)
- /* in case we don't yet track the link, rely on the hardcoded value */
- return ifindex == LOOPBACK_IFINDEX;
- else if (l->flags & IFF_LOOPBACK)
- return 1;
-
- return 0;
-}
-
int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr) {
LinkAddress *a;
int manager_llmnr_ipv4_tcp_fd(Manager *m);
int manager_llmnr_ipv6_tcp_fd(Manager *m);
-int manager_ifindex_is_loopback(Manager *m, int ifindex);
int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr);
LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr);
#ifndef BPF_XOR
# define BPF_XOR 0xa0
#endif
+
+/* Note that LOOPBACK_IFINDEX is currently not exported by the
+ * kernel/glibc, but hardcoded internally by the kernel. However, as
+ * it is exported to userspace indirectly via rtnetlink and the
+ * ioctls, and made use of widely we define it here too, in a way that
+ * is compatible with the kernel's internal definition. */
+#ifndef LOOPBACK_IFINDEX
+#define LOOPBACK_IFINDEX 1
+#endif