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Commit 7a35a50d authored by David Ahern's avatar David Ahern Committed by David S. Miller
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neighbor: Add extack messages for add and delete commands 



Add extack messages for failures in neigh_add and neigh_delete.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f5d6c3e5

net/core/neighbour.c

+39 −16
Original line number Diff line number Diff line
@@ -1137,8 +1137,9 @@ static void neigh_update_hhs(struct neighbour *neigh) 
   Caller MUST hold reference count on the entry.

 */



int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,

		 u32 flags, u32 nlmsg_pid)

static int __neigh_update(struct neighbour *neigh, const u8 *lladdr,

			  u8 new, u32 flags, u32 nlmsg_pid,

			  struct netlink_ext_ack *extack)

{

	u8 old;

	int err;
@@ -1155,8 +1156,10 @@ int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, 
	if (!(flags & NEIGH_UPDATE_F_ADMIN) &&

	    (old & (NUD_NOARP | NUD_PERMANENT)))

		goto out;

	if (neigh->dead)

	if (neigh->dead) {

		NL_SET_ERR_MSG(extack, "Neighbor entry is now dead");

		goto out;

	}



	neigh_update_ext_learned(neigh, flags, &notify);
@@ -1193,8 +1196,10 @@ int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, 
		   use it, otherwise discard the request.

		 */

		err = -EINVAL;

		if (!(old & NUD_VALID))

		if (!(old & NUD_VALID)) {

			NL_SET_ERR_MSG(extack, "No link layer address given");

			goto out;

		}

		lladdr = neigh->ha;

	}
@@ -1307,6 +1312,12 @@ int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, 


	return err;

}



int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,

		 u32 flags, u32 nlmsg_pid)

{

	return __neigh_update(neigh, lladdr, new, flags, nlmsg_pid, NULL);

}

EXPORT_SYMBOL(neigh_update);



/* Update the neigh to listen temporarily for probe responses, even if it is
@@ -1678,8 +1689,10 @@ static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, 
		goto out;



	dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST);

	if (dst_attr == NULL)

	if (!dst_attr) {

		NL_SET_ERR_MSG(extack, "Network address not specified");

		goto out;

	}



	ndm = nlmsg_data(nlh);

	if (ndm->ndm_ifindex) {
@@ -1694,8 +1707,10 @@ static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, 
	if (tbl == NULL)

		return -EAFNOSUPPORT;



	if (nla_len(dst_attr) < (int)tbl->key_len)

	if (nla_len(dst_attr) < (int)tbl->key_len) {

		NL_SET_ERR_MSG(extack, "Invalid network address");

		goto out;

	}



	if (ndm->ndm_flags & NTF_PROXY) {

		err = pneigh_delete(tbl, net, nla_data(dst_attr), dev);
@@ -1711,10 +1726,9 @@ static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, 
		goto out;

	}



	err = neigh_update(neigh, NULL, NUD_FAILED,

			   NEIGH_UPDATE_F_OVERRIDE |

			   NEIGH_UPDATE_F_ADMIN,

			   NETLINK_CB(skb).portid);

	err = __neigh_update(neigh, NULL, NUD_FAILED,

			     NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN,

			     NETLINK_CB(skb).portid, extack);

	write_lock_bh(&tbl->lock);

	neigh_release(neigh);

	neigh_remove_one(neigh, tbl);
@@ -1744,8 +1758,10 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, 
		goto out;



	err = -EINVAL;

	if (tb[NDA_DST] == NULL)

	if (!tb[NDA_DST]) {

		NL_SET_ERR_MSG(extack, "Network address not specified");

		goto out;

	}



	ndm = nlmsg_data(nlh);

	if (ndm->ndm_ifindex) {
@@ -1755,16 +1771,21 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, 
			goto out;

		}



		if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len)

		if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) {

			NL_SET_ERR_MSG(extack, "Invalid link address");

			goto out;

		}

	}



	tbl = neigh_find_table(ndm->ndm_family);

	if (tbl == NULL)

		return -EAFNOSUPPORT;



	if (nla_len(tb[NDA_DST]) < (int)tbl->key_len)

	if (nla_len(tb[NDA_DST]) < (int)tbl->key_len) {

		NL_SET_ERR_MSG(extack, "Invalid network address");

		goto out;

	}



	dst = nla_data(tb[NDA_DST]);

	lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL;
@@ -1780,8 +1801,10 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, 
		goto out;

	}



	if (dev == NULL)

	if (!dev) {

		NL_SET_ERR_MSG(extack, "Device not specified");

		goto out;

	}



	neigh = neigh_lookup(tbl, dst, dev);

	if (neigh == NULL) {
@@ -1817,8 +1840,8 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, 
		neigh_event_send(neigh, NULL);

		err = 0;

	} else

		err = neigh_update(neigh, lladdr, ndm->ndm_state, flags,

				   NETLINK_CB(skb).portid);

		err = __neigh_update(neigh, lladdr, ndm->ndm_state, flags,

				     NETLINK_CB(skb).portid, extack);

	neigh_release(neigh);



out: