net/ipv4: Move loop over addresses on a device into in_dev_dump_addr

Similar to IPv6 move the logic that walks over the ipv4 address list
for a device into a helper.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index d122ebb..67f382c 100644 (file)
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1713,6 +1713,32 @@ static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
        return 0;
 }
 
+static int in_dev_dump_addr(struct in_device *in_dev, struct sk_buff *skb,
+                           struct netlink_callback *cb, int s_ip_idx,
+                           struct inet_fill_args *fillargs)
+{
+       struct in_ifaddr *ifa;
+       int ip_idx = 0;
+       int err;
+
+       for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next, ip_idx++) {
+               if (ip_idx < s_ip_idx)
+                       continue;
+
+               err = inet_fill_ifaddr(skb, ifa, fillargs);
+               if (err < 0)
+                       goto done;
+
+               nl_dump_check_consistent(cb, nlmsg_hdr(skb));
+       }
+       err = 0;
+
+done:
+       cb->args[2] = ip_idx;
+
+       return err;
+}
+
 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 {
        const struct nlmsghdr *nlh = cb->nlh;
@@ -1727,19 +1753,17 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
        struct net *tgt_net = net;
        int h, s_h;
        int idx, s_idx;
-       int ip_idx, s_ip_idx;
+       int s_ip_idx;
        struct net_device *dev;
        struct in_device *in_dev;
-       struct in_ifaddr *ifa;
        struct hlist_head *head;
+       int err;
 
        s_h = cb->args[0];
        s_idx = idx = cb->args[1];
-       s_ip_idx = ip_idx = cb->args[2];
+       s_ip_idx = cb->args[2];
 
        if (cb->strict_check) {
-               int err;
-
                err = inet_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
                                                 skb->sk, cb->extack);
                if (err < 0)
@@ -1761,15 +1785,11 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
                        if (!in_dev)
                                goto cont;
 
-                       for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
-                            ifa = ifa->ifa_next, ip_idx++) {
-                               if (ip_idx < s_ip_idx)
-                                       continue;
-                               if (inet_fill_ifaddr(skb, ifa, &fillargs) < 0) {
-                                       rcu_read_unlock();
-                                       goto done;
-                               }
-                               nl_dump_check_consistent(cb, nlmsg_hdr(skb));
+                       err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
+                                              &fillargs);
+                       if (err < 0) {
+                               rcu_read_unlock();
+                               goto done;
                        }
 cont:
                        idx++;
@@ -1780,7 +1800,6 @@ cont:
 done:
        cb->args[0] = h;
        cb->args[1] = idx;
-       cb->args[2] = ip_idx;
        if (fillargs.netnsid >= 0)
                put_net(tgt_net);