system-linux: fix the default broadcast address for v4

diff --git a/system-linux.c b/system-linux.c
index 58ac5d4..0a989b0 100644 (file)
--- a/system-linux.c
+++ b/system-linux.c
@@ -807,7 +807,8 @@ system_if_dump_stats(struct device *dev, struct blob_buf *b)
 
 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
 {
 
 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
 {

-       int alen = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
+       bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
+       int alen = v4 ? 4 : 16;

        struct ifaddrmsg ifa = {
                .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
                .ifa_prefixlen = addr->mask,
        struct ifaddrmsg ifa = {
                .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
                .ifa_prefixlen = addr->mask,


@@ -822,6 +823,14 @@ static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
 
        nlmsg_append(msg, &ifa, sizeof(ifa), 0);
        nla_put(msg, IFA_LOCAL, alen, &addr->addr);
 
        nlmsg_append(msg, &ifa, sizeof(ifa), 0);
        nla_put(msg, IFA_LOCAL, alen, &addr->addr);

+       if (v4) {
+               uint32_t mask = ~0;
+               uint32_t *a = (uint32_t *) &addr->addr;
+
+               mask >>= addr->mask;
+               nla_put_u32(msg, IFA_BROADCAST, *a | mask);
+       }
+

        return system_rtnl_call(msg);
 }
 
        return system_rtnl_call(msg);
 }