Commit df9b0e30 authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

neighbor: Add protocol attribute 



Similar to routes and rules, add protocol attribute to neighbor entries
for easier tracking of how each was created.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 11fb60d1

include/net/neighbour.h

+2 −0
Original line number Diff line number Diff line
@@ -149,6 +149,7 @@ struct neighbour { 
	__u8			nud_state;

	__u8			type;

	__u8			dead;

	u8			protocol;

	seqlock_t		ha_lock;

	unsigned char		ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))] __aligned(8);

	struct hh_cache		hh;
@@ -173,6 +174,7 @@ struct pneigh_entry { 
	possible_net_t		net;

	struct net_device	*dev;

	u8			flags;

	u8			protocol;

	u8			key[0];

};

include/uapi/linux/neighbour.h

+1 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ enum { 
	NDA_MASTER,

	NDA_LINK_NETNSID,

	NDA_SRC_VNI,

	NDA_PROTOCOL,  /* Originator of entry */

	__NDA_MAX

};

net/core/neighbour.c

+23 −1
Original line number Diff line number Diff line
@@ -1828,6 +1828,7 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, 
	struct net_device *dev = NULL;

	struct neighbour *neigh;

	void *dst, *lladdr;

	u8 protocol = 0;

	int err;



	ASSERT_RTNL();
@@ -1867,6 +1868,14 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, 
	dst = nla_data(tb[NDA_DST]);

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



	if (tb[NDA_PROTOCOL]) {

		if (nla_len(tb[NDA_PROTOCOL]) != sizeof(u8)) {

			NL_SET_ERR_MSG(extack, "Invalid protocol attribute");

			goto out;

		}

		protocol = nla_get_u8(tb[NDA_PROTOCOL]);

	}



	if (ndm->ndm_flags & NTF_PROXY) {

		struct pneigh_entry *pn;
@@ -1874,6 +1883,8 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, 
		pn = pneigh_lookup(tbl, net, dst, dev, 1);

		if (pn) {

			pn->flags = ndm->ndm_flags;

			if (protocol)

				pn->protocol = protocol;

			err = 0;

		}

		goto out;
@@ -1924,6 +1935,10 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, 
	} else

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

				     NETLINK_CB(skb).portid, extack);



	if (protocol)

		neigh->protocol = protocol;



	neigh_release(neigh);



out:
@@ -2417,6 +2432,9 @@ static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, 
	    nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))

		goto nla_put_failure;



	if (neigh->protocol && nla_put_u8(skb, NDA_PROTOCOL, neigh->protocol))

		goto nla_put_failure;



	nlmsg_end(skb, nlh);

	return 0;
@@ -2448,6 +2466,9 @@ static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn, 
	if (nla_put(skb, NDA_DST, tbl->key_len, pn->key))

		goto nla_put_failure;



	if (pn->protocol && nla_put_u8(skb, NDA_PROTOCOL, pn->protocol))

		goto nla_put_failure;



	nlmsg_end(skb, nlh);

	return 0;
@@ -3103,7 +3124,8 @@ static inline size_t neigh_nlmsg_size(void) 
	       + 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(4)  /* NDA_PROBES */

	       + nla_total_size(1); /* NDA_PROTOCOL */

}



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

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