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authorRoopa Prabhu <roopa@cumulusnetworks.com>2017-03-20 08:01:28 +0300
committerDavid S. Miller <davem@davemloft.net>2017-03-22 20:48:49 +0300
commit7b8f7a402d4cfc3a1361a2766066127f9bccadc4 (patch)
treeb44eafb94e7ea3bb32b4bb234746716cc5c535b2 /net/core/neighbour.c
parent7ada7ca562714632d0fc9abb24e27cab67bdbf0d (diff)
downloadlinux-7b8f7a402d4cfc3a1361a2766066127f9bccadc4.tar.xz
neighbour: fix nlmsg_pid in notifications
neigh notifications today carry pid 0 for nlmsg_pid in all cases. This patch fixes it to carry calling process pid when available. Applications (eg. quagga) rely on nlmsg_pid to ignore notifications generated by their own netlink operations. This patch follows the routing subsystem which already sets this correctly. Reported-by: Vivek Venkatraman <vivek@cumulusnetworks.com> Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/neighbour.c')
-rw-r--r--net/core/neighbour.c32
1 files changed, 18 insertions, 14 deletions
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index e7c12caa20c8..7069f5e4a361 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -52,8 +52,9 @@ do { \
#define PNEIGH_HASHMASK 0xF
static void neigh_timer_handler(unsigned long arg);
-static void __neigh_notify(struct neighbour *n, int type, int flags);
-static void neigh_update_notify(struct neighbour *neigh);
+static void __neigh_notify(struct neighbour *n, int type, int flags,
+ u32 pid);
+static void neigh_update_notify(struct neighbour *neigh, u32 nlmsg_pid);
static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
#ifdef CONFIG_PROC_FS
@@ -99,7 +100,7 @@ static void neigh_cleanup_and_release(struct neighbour *neigh)
if (neigh->parms->neigh_cleanup)
neigh->parms->neigh_cleanup(neigh);
- __neigh_notify(neigh, RTM_DELNEIGH, 0);
+ __neigh_notify(neigh, RTM_DELNEIGH, 0, 0);
call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh);
neigh_release(neigh);
}
@@ -948,7 +949,7 @@ out:
}
if (notify)
- neigh_update_notify(neigh);
+ neigh_update_notify(neigh, 0);
neigh_release(neigh);
}
@@ -1072,7 +1073,7 @@ static void neigh_update_hhs(struct neighbour *neigh)
*/
int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
- u32 flags)
+ u32 flags, u32 nlmsg_pid)
{
u8 old;
int err;
@@ -1229,7 +1230,7 @@ out:
write_unlock_bh(&neigh->lock);
if (notify)
- neigh_update_notify(neigh);
+ neigh_update_notify(neigh, nlmsg_pid);
return err;
}
@@ -1260,7 +1261,7 @@ struct neighbour *neigh_event_ns(struct neigh_table *tbl,
lladdr || !dev->addr_len);
if (neigh)
neigh_update(neigh, lladdr, NUD_STALE,
- NEIGH_UPDATE_F_OVERRIDE);
+ NEIGH_UPDATE_F_OVERRIDE, 0);
return neigh;
}
EXPORT_SYMBOL(neigh_event_ns);
@@ -1638,7 +1639,8 @@ static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh)
err = neigh_update(neigh, NULL, NUD_FAILED,
NEIGH_UPDATE_F_OVERRIDE |
- NEIGH_UPDATE_F_ADMIN);
+ NEIGH_UPDATE_F_ADMIN,
+ NETLINK_CB(skb).portid);
neigh_release(neigh);
out:
@@ -1729,7 +1731,8 @@ 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);
+ err = neigh_update(neigh, lladdr, ndm->ndm_state, flags,
+ NETLINK_CB(skb).portid);
neigh_release(neigh);
out:
@@ -2229,10 +2232,10 @@ nla_put_failure:
return -EMSGSIZE;
}
-static void neigh_update_notify(struct neighbour *neigh)
+static void neigh_update_notify(struct neighbour *neigh, u32 nlmsg_pid)
{
call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh);
- __neigh_notify(neigh, RTM_NEWNEIGH, 0);
+ __neigh_notify(neigh, RTM_NEWNEIGH, 0, nlmsg_pid);
}
static bool neigh_master_filtered(struct net_device *dev, int master_idx)
@@ -2830,7 +2833,8 @@ static inline size_t neigh_nlmsg_size(void)
+ nla_total_size(4); /* NDA_PROBES */
}
-static void __neigh_notify(struct neighbour *n, int type, int flags)
+static void __neigh_notify(struct neighbour *n, int type, int flags,
+ u32 pid)
{
struct net *net = dev_net(n->dev);
struct sk_buff *skb;
@@ -2840,7 +2844,7 @@ static void __neigh_notify(struct neighbour *n, int type, int flags)
if (skb == NULL)
goto errout;
- err = neigh_fill_info(skb, n, 0, 0, type, flags);
+ err = neigh_fill_info(skb, n, pid, 0, type, flags);
if (err < 0) {
/* -EMSGSIZE implies BUG in neigh_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
@@ -2856,7 +2860,7 @@ errout:
void neigh_app_ns(struct neighbour *n)
{
- __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST);
+ __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST, 0);
}
EXPORT_SYMBOL(neigh_app_ns);