Commit 24894bc6 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'neigh-get-support' 



Roopa Prabhu says:

====================
neigh get support

This series adds support for neigh get similar
to route and recently added fdb get.

v2: fix key len check. and some other fixes
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 4ab0edec 8deecf35

include/net/neighbour.h

+1 −0
Original line number Diff line number Diff line
@@ -255,6 +255,7 @@ static inline void *neighbour_priv(const struct neighbour *n) 
#define NEIGH_UPDATE_F_ISROUTER			0x40000000

#define NEIGH_UPDATE_F_ADMIN			0x80000000



extern const struct nla_policy nda_policy[];



static inline bool neigh_key_eq16(const struct neighbour *n, const void *pkey)

{

net/core/neighbour.c

+193 −11
Original line number Diff line number Diff line
@@ -1751,6 +1751,18 @@ static struct neigh_table *neigh_find_table(int family) 
	return tbl;

}



const struct nla_policy nda_policy[NDA_MAX+1] = {

	[NDA_DST]		= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },

	[NDA_LLADDR]		= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },

	[NDA_CACHEINFO]		= { .len = sizeof(struct nda_cacheinfo) },

	[NDA_PROBES]		= { .type = NLA_U32 },

	[NDA_VLAN]		= { .type = NLA_U16 },

	[NDA_PORT]		= { .type = NLA_U16 },

	[NDA_VNI]		= { .type = NLA_U32 },

	[NDA_IFINDEX]		= { .type = NLA_U32 },

	[NDA_MASTER]		= { .type = NLA_U32 },

};



static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh,

			struct netlink_ext_ack *extack)

{
@@ -2711,6 +2723,186 @@ static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) 
	return skb->len;

}



static int neigh_valid_get_req(const struct nlmsghdr *nlh,

			       struct neigh_table **tbl,

			       void **dst, int *dev_idx, u8 *ndm_flags,

			       struct netlink_ext_ack *extack)

{

	struct nlattr *tb[NDA_MAX + 1];

	struct ndmsg *ndm;

	int err, i;



	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {

		NL_SET_ERR_MSG(extack, "Invalid header for neighbor get request");

		return -EINVAL;

	}



	ndm = nlmsg_data(nlh);

	if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||

	    ndm->ndm_type) {

		NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor get request");

		return -EINVAL;

	}



	if (ndm->ndm_flags & ~NTF_PROXY) {

		NL_SET_ERR_MSG(extack, "Invalid flags in header for neighbor get request");

		return -EINVAL;

	}



	err = nlmsg_parse_strict(nlh, sizeof(struct ndmsg), tb, NDA_MAX,

				 nda_policy, extack);

	if (err < 0)

		return err;



	*ndm_flags = ndm->ndm_flags;

	*dev_idx = ndm->ndm_ifindex;

	*tbl = neigh_find_table(ndm->ndm_family);

	if (*tbl == NULL) {

		NL_SET_ERR_MSG(extack, "Unsupported family in header for neighbor get request");

		return -EAFNOSUPPORT;

	}



	for (i = 0; i <= NDA_MAX; ++i) {

		if (!tb[i])

			continue;



		switch (i) {

		case NDA_DST:

			if (nla_len(tb[i]) != (int)(*tbl)->key_len) {

				NL_SET_ERR_MSG(extack, "Invalid network address in neighbor get request");

				return -EINVAL;

			}

			*dst = nla_data(tb[i]);

			break;

		default:

			NL_SET_ERR_MSG(extack, "Unsupported attribute in neighbor get request");

			return -EINVAL;

		}

	}



	return 0;

}



static inline size_t neigh_nlmsg_size(void)

{

	return NLMSG_ALIGN(sizeof(struct ndmsg))

	       + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */

	       + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */

	       + nla_total_size(sizeof(struct nda_cacheinfo))

	       + nla_total_size(4)  /* NDA_PROBES */

	       + nla_total_size(1); /* NDA_PROTOCOL */

}



static int neigh_get_reply(struct net *net, struct neighbour *neigh,

			   u32 pid, u32 seq)

{

	struct sk_buff *skb;

	int err = 0;



	skb = nlmsg_new(neigh_nlmsg_size(), GFP_KERNEL);

	if (!skb)

		return -ENOBUFS;



	err = neigh_fill_info(skb, neigh, pid, seq, RTM_NEWNEIGH, 0);

	if (err) {

		kfree_skb(skb);

		goto errout;

	}



	err = rtnl_unicast(skb, net, pid);

errout:

	return err;

}



static inline size_t pneigh_nlmsg_size(void)

{

	return NLMSG_ALIGN(sizeof(struct ndmsg))

	       + nla_total_size(MAX_ADDR_LEN); /* NDA_DST */

	       + nla_total_size(1); /* NDA_PROTOCOL */

}



static int pneigh_get_reply(struct net *net, struct pneigh_entry *neigh,

			    u32 pid, u32 seq, struct neigh_table *tbl)

{

	struct sk_buff *skb;

	int err = 0;



	skb = nlmsg_new(pneigh_nlmsg_size(), GFP_KERNEL);

	if (!skb)

		return -ENOBUFS;



	err = pneigh_fill_info(skb, neigh, pid, seq, RTM_NEWNEIGH, 0, tbl);

	if (err) {

		kfree_skb(skb);

		goto errout;

	}



	err = rtnl_unicast(skb, net, pid);

errout:

	return err;

}



static int neigh_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,

		     struct netlink_ext_ack *extack)

{

	struct net *net = sock_net(in_skb->sk);

	struct net_device *dev = NULL;

	struct neigh_table *tbl = NULL;

	struct neighbour *neigh;

	void *dst = NULL;

	u8 ndm_flags = 0;

	int dev_idx = 0;

	int err;



	err = neigh_valid_get_req(nlh, &tbl, &dst, &dev_idx, &ndm_flags,

				  extack);

	if (err < 0)

		return err;



	if (dev_idx) {

		dev = __dev_get_by_index(net, dev_idx);

		if (!dev) {

			NL_SET_ERR_MSG(extack, "Unknown device ifindex");

			return -ENODEV;

		}

	}



	if (!dst) {

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

		return -EINVAL;

	}



	if (ndm_flags & NTF_PROXY) {

		struct pneigh_entry *pn;



		pn = pneigh_lookup(tbl, net, dst, dev, 0);

		if (!pn) {

			NL_SET_ERR_MSG(extack, "Proxy neighbour entry not found");

			return -ENOENT;

		}

		return pneigh_get_reply(net, pn, NETLINK_CB(in_skb).portid,

					nlh->nlmsg_seq, tbl);

	}



	if (!dev) {

		NL_SET_ERR_MSG(extack, "No device specified");

		return -EINVAL;

	}



	neigh = neigh_lookup(tbl, dst, dev);

	if (!neigh) {

		NL_SET_ERR_MSG(extack, "Neighbour entry not found");

		return -ENOENT;

	}



	err = neigh_get_reply(net, neigh, NETLINK_CB(in_skb).portid,

			      nlh->nlmsg_seq);



	neigh_release(neigh);



	return err;

}



void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie)

{

	int chain;
@@ -3118,16 +3310,6 @@ static const struct seq_operations neigh_stat_seq_ops = { 
};

#endif /* CONFIG_PROC_FS */



static inline size_t neigh_nlmsg_size(void)

{

	return NLMSG_ALIGN(sizeof(struct ndmsg))

	       + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */

	       + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */

	       + nla_total_size(sizeof(struct nda_cacheinfo))

	       + nla_total_size(4)  /* NDA_PROBES */

	       + nla_total_size(1); /* NDA_PROTOCOL */

}



static void __neigh_notify(struct neighbour *n, int type, int flags,

			   u32 pid)

{
@@ -3511,7 +3693,7 @@ static int __init neigh_init(void) 
{

	rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, 0);

	rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, 0);

	rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info, 0);

	rtnl_register(PF_UNSPEC, RTM_GETNEIGH, neigh_get, neigh_dump_info, 0);



	rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info,

		      0);

net/core/rtnetlink.c

+0 −12
Original line number Diff line number Diff line
@@ -3460,18 +3460,6 @@ void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change, 
			   new_nsid, new_ifindex);

}



static const struct nla_policy nda_policy[NDA_MAX+1] = {

	[NDA_DST]		= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },

	[NDA_LLADDR]		= { .type = NLA_BINARY, .len = MAX_ADDR_LEN },

	[NDA_CACHEINFO]		= { .len = sizeof(struct nda_cacheinfo) },

	[NDA_PROBES]		= { .type = NLA_U32 },

	[NDA_VLAN]		= { .type = NLA_U16 },

	[NDA_PORT]		= { .type = NLA_U16 },

	[NDA_VNI]		= { .type = NLA_U32 },

	[NDA_IFINDEX]		= { .type = NLA_U32 },

	[NDA_MASTER]		= { .type = NLA_U32 },

};



static int nlmsg_populate_fdb_fill(struct sk_buff *skb,

				   struct net_device *dev,

				   u8 *addr, u16 vid, u32 pid, u32 seq,

tools/testing/selftests/net/rtnetlink.sh

+54 −0
Original line number Diff line number Diff line
@@ -1007,6 +1007,59 @@ kci_test_fdb_get() 
	echo "PASS: bridge fdb get"

}



kci_test_neigh_get()

{

	dstmac=de:ad:be:ef:13:37

	dstip=10.0.2.4

	dstip6=dead::2

	ret=0



	ip neigh help 2>&1 |grep -q 'ip neigh get'

	if [ $? -ne 0 ];then

		echo "SKIP: fdb get tests: iproute2 too old"

		return $ksft_skip

	fi



	# ipv4

	ip neigh add $dstip lladdr $dstmac dev "$devdummy"  > /dev/null

	check_err $?

	ip neigh get $dstip dev "$devdummy" 2> /dev/null | grep -q "$dstmac"

	check_err $?

	ip neigh del $dstip lladdr $dstmac dev "$devdummy"  > /dev/null

	check_err $?



	# ipv4 proxy

	ip neigh add proxy $dstip dev "$devdummy" > /dev/null

	check_err $?

	ip neigh get proxy $dstip dev "$devdummy" 2>/dev/null | grep -q "$dstip"

	check_err $?

	ip neigh del proxy $dstip dev "$devdummy" > /dev/null

	check_err $?



	# ipv6

	ip neigh add $dstip6 lladdr $dstmac dev "$devdummy"  > /dev/null

	check_err $?

	ip neigh get $dstip6 dev "$devdummy" 2> /dev/null | grep -q "$dstmac"

	check_err $?

	ip neigh del $dstip6 lladdr $dstmac dev "$devdummy"  > /dev/null

	check_err $?



	# ipv6 proxy

	ip neigh add proxy $dstip6 dev "$devdummy" > /dev/null

	check_err $?

	ip neigh get proxy $dstip6 dev "$devdummy" 2>/dev/null | grep -q "$dstip6"

	check_err $?

	ip neigh del proxy $dstip6 dev "$devdummy" > /dev/null

	check_err $?



	if [ $ret -ne 0 ];then

		echo "FAIL: neigh get"

		return 1

	fi



	echo "PASS: neigh get"

}



kci_test_rtnl()

{

	kci_add_dummy
@@ -1032,6 +1085,7 @@ kci_test_rtnl() 
	kci_test_ipsec

	kci_test_ipsec_offload

	kci_test_fdb_get

	kci_test_neigh_get



	kci_del_dummy

}

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