ipmr: Do not use RTA_PUT() macros

Also fix a needless skb tailroom check for a 4 bytes area
after after each rtnexthop block.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index c94bbc6..b4ac39f 100644 (file)
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -2006,37 +2006,37 @@ static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
 {
        int ct;
        struct rtnexthop *nhp;
-       u8 *b = skb_tail_pointer(skb);
-       struct rtattr *mp_head;
+       struct nlattr *mp_attr;
 
        /* If cache is unresolved, don't try to parse IIF and OIF */
        if (c->mfc_parent >= MAXVIFS)
                return -ENOENT;
 
-       if (VIF_EXISTS(mrt, c->mfc_parent))
-               RTA_PUT(skb, RTA_IIF, 4, &mrt->vif_table[c->mfc_parent].dev->ifindex);
+       if (VIF_EXISTS(mrt, c->mfc_parent) &&
+           nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0)
+               return -EMSGSIZE;
 
-       mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0));
+       if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH)))
+               return -EMSGSIZE;
 
        for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
                if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
-                       if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
-                               goto rtattr_failure;
-                       nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
+                       if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) {
+                               nla_nest_cancel(skb, mp_attr);
+                               return -EMSGSIZE;
+                       }
+
                        nhp->rtnh_flags = 0;
                        nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
                        nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex;
                        nhp->rtnh_len = sizeof(*nhp);
                }
        }
-       mp_head->rta_type = RTA_MULTIPATH;
-       mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head;
+
+       nla_nest_end(skb, mp_attr);
+
        rtm->rtm_type = RTN_MULTICAST;
        return 1;
-
-rtattr_failure:
-       nlmsg_trim(skb, b);
-       return -EMSGSIZE;
 }
 
 int ipmr_get_route(struct net *net, struct sk_buff *skb,