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neighbor: Add protocol attribute

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

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-12-15 14:09:06 -08:00 committed by David S. Miller
parent 11fb60d108
commit df9b0e30d4
3 changed files with 26 additions and 1 deletions
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2
include/net/neighbour.h
View File

@ -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];
};

1
include/uapi/linux/neighbour.h
View File

@ -28,6 +28,7 @@ enum {
NDA_MASTER,
NDA_LINK_NETNSID,
NDA_SRC_VNI,
NDA_PROTOCOL, /* Originator of entry */
__NDA_MAX
};

24
net/core/neighbour.c
View File

@ -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,