bonding: only receive ARPs for us

[linux-2.6-omap-h63xx.git] / net / core / fib_rules.c

diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 4148e274a2049b2ef0bcd87d158d6b4b9d9082c3..215f1bff048feeb8991ebd3a49bc406d15053f77 100644 (file)
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -306,6 +306,22 @@ errout:
        return err;
 }
 
+static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
+                                        struct fib_rule *rule)
+{
+       size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
+                        + nla_total_size(IFNAMSIZ) /* FRA_IFNAME */
+                        + nla_total_size(4) /* FRA_PRIORITY */
+                        + nla_total_size(4) /* FRA_TABLE */
+                        + nla_total_size(4) /* FRA_FWMARK */
+                        + nla_total_size(4); /* FRA_FWMASK */
+
+       if (ops->nlmsg_payload)
+               payload += ops->nlmsg_payload(rule);
+
+       return payload;
+}
+
 static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
                            u32 pid, u32 seq, int type, int flags,
                            struct fib_rules_ops *ops)
@@ -315,7 +331,7 @@ static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
 
        nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
        if (nlh == NULL)
-               return -1;
+               return -EMSGSIZE;
 
        frh = nlmsg_data(nlh);
        frh->table = rule->table;
@@ -343,7 +359,8 @@ static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
        return nlmsg_end(skb, nlh);
 
 nla_put_failure:
-       return nlmsg_cancel(skb, nlh);
+       nlmsg_cancel(skb, nlh);
+       return -EMSGSIZE;
 }
 
 int fib_rules_dump(struct sk_buff *skb, struct netlink_callback *cb, int family)
@@ -384,16 +401,17 @@ static void notify_rule_change(int event, struct fib_rule *rule,
        struct sk_buff *skb;
        int err = -ENOBUFS;
 
-       skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+       skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
        if (skb == NULL)
                goto errout;
 
        err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
        if (err < 0) {
+               /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
+               WARN_ON(err == -EMSGSIZE);
                kfree_skb(skb);
                goto errout;
        }
-
        err = rtnl_notify(skb, pid, ops->nlgroup, nlh, GFP_KERNEL);
 errout:
        if (err < 0)