diff options
| -rw-r--r-- | netlink.c | 19 |
1 files changed, 14 insertions, 5 deletions
@@ -527,7 +527,7 @@ int nl_route_dup(int s_src, unsigned int ifi_src, } /** - * nl_addr_get() - Get IP address for given interface and address family + * nl_addr_get() - Get most specific global address, given interface and family * @s: Netlink socket * @ifi: Interface index in outer network namespace * @af: Address family @@ -540,6 +540,7 @@ int nl_route_dup(int s_src, unsigned int ifi_src, int nl_addr_get(int s, unsigned int ifi, sa_family_t af, void *addr, int *prefix_len, void *addr_l) { + uint8_t prefix_max = 0, prefix_max_ll = 0; struct req_t { struct nlmsghdr nlh; struct ifaddrmsg ifa; @@ -566,17 +567,25 @@ int nl_addr_get(int s, unsigned int ifi, sa_family_t af, if (rta->rta_type != IFA_ADDRESS) continue; - if (af == AF_INET) { + if (af == AF_INET && ifa->ifa_prefixlen > prefix_max) { memcpy(addr, RTA_DATA(rta), RTA_PAYLOAD(rta)); - *prefix_len = ifa->ifa_prefixlen; + + prefix_max = *prefix_len = ifa->ifa_prefixlen; } else if (af == AF_INET6 && addr && - ifa->ifa_scope == RT_SCOPE_UNIVERSE) { + ifa->ifa_scope == RT_SCOPE_UNIVERSE && + ifa->ifa_prefixlen > prefix_max) { memcpy(addr, RTA_DATA(rta), RTA_PAYLOAD(rta)); + + prefix_max = ifa->ifa_prefixlen; } if (addr_l && - af == AF_INET6 && ifa->ifa_scope == RT_SCOPE_LINK) + af == AF_INET6 && ifa->ifa_scope == RT_SCOPE_LINK && + ifa->ifa_prefixlen > prefix_max_ll) { memcpy(addr_l, RTA_DATA(rta), RTA_PAYLOAD(rta)); + + prefix_max_ll = ifa->ifa_prefixlen; + } } } return status; |