Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi...

[cascardo/linux.git] / net / core / fib_rules.c

diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 98298b1..be4629c 100644 (file)
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -269,6 +269,49 @@ errout:
        return err;
 }
 
+static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh,
+                      struct nlattr **tb, struct fib_rule *rule)
+{
+       struct fib_rule *r;
+
+       list_for_each_entry(r, &ops->rules_list, list) {
+               if (r->action != rule->action)
+                       continue;
+
+               if (r->table != rule->table)
+                       continue;
+
+               if (r->pref != rule->pref)
+                       continue;
+
+               if (memcmp(r->iifname, rule->iifname, IFNAMSIZ))
+                       continue;
+
+               if (memcmp(r->oifname, rule->oifname, IFNAMSIZ))
+                       continue;
+
+               if (r->mark != rule->mark)
+                       continue;
+
+               if (r->mark_mask != rule->mark_mask)
+                       continue;
+
+               if (r->tun_id != rule->tun_id)
+                       continue;
+
+               if (r->fr_net != rule->fr_net)
+                       continue;
+
+               if (r->l3mdev != rule->l3mdev)
+                       continue;
+
+               if (!ops->compare(r, frh, tb))
+                       continue;
+               return 1;
+       }
+       return 0;
+}
+
 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh)
 {
        struct net *net = sock_net(skb->sk);
@@ -386,6 +429,12 @@ int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh)
        if (rule->l3mdev && rule->table)
                goto errout_free;
 
+       if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
+           rule_exists(ops, frh, tb, rule)) {
+               err = -EEXIST;
+               goto errout_free;
+       }
+
        err = ops->configure(rule, skb, frh, tb);
        if (err < 0)
                goto errout_free;