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Commit 5208debd authored by Thomas Graf's avatar Thomas Graf Committed by David S. Miller
Browse files

[NEIGH]: Convert neighbour addition to new netlink api 



Fixes:
    Return EAFNOSUPPORT if no table matches the specified
    address family.

Signed-off-by: default avatarThomas Graf <tgraf@suug.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a14a49d2

net/core/neighbour.c

+51 −39
Original line number Diff line number Diff line
@@ -1506,76 +1506,88 @@ int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 


int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)

{

	struct ndmsg *ndm = NLMSG_DATA(nlh);

	struct rtattr **nda = arg;

	struct ndmsg *ndm;

	struct nlattr *tb[NDA_MAX+1];

	struct neigh_table *tbl;

	struct net_device *dev = NULL;

	int err = -ENODEV;

	int err;



	if (ndm->ndm_ifindex &&

	    (dev = dev_get_by_index(ndm->ndm_ifindex)) == NULL)

	err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL);

	if (err < 0)

		goto out;



	err = -EINVAL;

	if (tb[NDA_DST] == NULL)

		goto out;



	ndm = nlmsg_data(nlh);

	if (ndm->ndm_ifindex) {

		dev = dev_get_by_index(ndm->ndm_ifindex);

		if (dev == NULL) {

			err = -ENODEV;

			goto out;

		}



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

			goto out_dev_put;

	}



	read_lock(&neigh_tbl_lock);

	for (tbl = neigh_tables; tbl; tbl = tbl->next) {

		struct rtattr *lladdr_attr = nda[NDA_LLADDR - 1];

		struct rtattr *dst_attr = nda[NDA_DST - 1];

		int override = 1;

		struct neighbour *n;

		int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE;

		struct neighbour *neigh;

		void *dst, *lladdr;



		if (tbl->family != ndm->ndm_family)

			continue;

		read_unlock(&neigh_tbl_lock);



		err = -EINVAL;

		if (!dst_attr || RTA_PAYLOAD(dst_attr) < tbl->key_len)

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

			goto out_dev_put;

		dst = nla_data(tb[NDA_DST]);

		lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL;



		if (ndm->ndm_flags & NTF_PROXY) {

			err = -ENOBUFS;

			if (pneigh_lookup(tbl, RTA_DATA(dst_attr), dev, 1))

			err = 0;

			if (pneigh_lookup(tbl, dst, dev, 1) == NULL)

				err = -ENOBUFS;

			goto out_dev_put;

		}



		err = -EINVAL;

		if (!dev)

			goto out;

		if (lladdr_attr && RTA_PAYLOAD(lladdr_attr) < dev->addr_len)

		if (dev == NULL)

			goto out_dev_put;



		n = neigh_lookup(tbl, RTA_DATA(dst_attr), dev);

		if (n) {

			if (nlh->nlmsg_flags & NLM_F_EXCL) {

				err = -EEXIST;

				neigh_release(n);

		neigh = neigh_lookup(tbl, dst, dev);

		if (neigh == NULL) {

			if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {

				err = -ENOENT;

				goto out_dev_put;

			}

	

			override = nlh->nlmsg_flags & NLM_F_REPLACE;

		} else if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {

			err = -ENOENT;

			neigh = __neigh_lookup_errno(tbl, dst, dev);

			if (IS_ERR(neigh)) {

				err = PTR_ERR(neigh);

				goto out_dev_put;

			}

		} else {

			n = __neigh_lookup_errno(tbl, RTA_DATA(dst_attr), dev);

			if (IS_ERR(n)) {

				err = PTR_ERR(n);

			if (nlh->nlmsg_flags & NLM_F_EXCL) {

				err = -EEXIST;

				neigh_release(neigh);

				goto out_dev_put;

			}

		}



		err = neigh_update(n,

				   lladdr_attr ? RTA_DATA(lladdr_attr) : NULL,

				   ndm->ndm_state,

				   (override ? NEIGH_UPDATE_F_OVERRIDE : 0) |

				   NEIGH_UPDATE_F_ADMIN);

			if (!(nlh->nlmsg_flags & NLM_F_REPLACE))

				flags &= ~NEIGH_UPDATE_F_OVERRIDE;

		}



		neigh_release(n);

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

		neigh_release(neigh);

		goto out_dev_put;

	}



	read_unlock(&neigh_tbl_lock);

	err = -EADDRNOTAVAIL;

	err = -EAFNOSUPPORT;



out_dev_put:

	if (dev)

		dev_put(dev);