diff options
| author | Petr Machata <petrm@nvidia.com> | 2026-01-21 19:43:35 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-01-26 01:57:36 +0300 |
| commit | 77fa50dcb987338e6d5253c49d590da667b12657 (patch) | |
| tree | e100444d8948d1a7dc552dcb670c6df1576e2dcf | |
| parent | e4faaf65a75f650ac4366ddff5dabb826029ca5a (diff) | |
| download | linux-77fa50dcb987338e6d5253c49d590da667b12657.tar.xz | |
net: core: neighbour: Add a neigh_fill_info() helper for when lock not held
The netlink message needs to be formatted and sent inside the critical
section where the neighbor is changed, so that it reflects the
notified-upon neighbor state. Because it will happen inside an already
existing critical section, it has to assume that the neighbor lock is held.
Add a helper __neigh_fill_info(), which is like neigh_fill_info(), but
makes this assumption. Convert neigh_fill_info() to a wrapper around this
new helper.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/7ec20113d5d809200e3534d3ed8f0004514914b8.1769012464.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | net/core/neighbour.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/net/core/neighbour.c b/net/core/neighbour.c index 96a3b1a93252..6cdd93dfa3ea 100644 --- a/net/core/neighbour.c +++ b/net/core/neighbour.c @@ -2622,8 +2622,8 @@ out: return skb->len; } -static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, - u32 pid, u32 seq, int type, unsigned int flags) +static int __neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, + u32 pid, u32 seq, int type, unsigned int flags) { u32 neigh_flags, neigh_flags_ext; unsigned long now = jiffies; @@ -2649,23 +2649,19 @@ static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, if (nla_put(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key)) goto nla_put_failure; - read_lock_bh(&neigh->lock); ndm->ndm_state = neigh->nud_state; if (neigh->nud_state & NUD_VALID) { char haddr[MAX_ADDR_LEN]; neigh_ha_snapshot(haddr, neigh, neigh->dev); - if (nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, haddr) < 0) { - read_unlock_bh(&neigh->lock); + if (nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, haddr) < 0) goto nla_put_failure; - } } ci.ndm_used = jiffies_to_clock_t(now - neigh->used); ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed); ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated); ci.ndm_refcnt = refcount_read(&neigh->refcnt) - 1; - read_unlock_bh(&neigh->lock); if (nla_put_u32(skb, NDA_PROBES, atomic_read(&neigh->probes)) || nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) @@ -2684,6 +2680,20 @@ nla_put_failure: return -EMSGSIZE; } +static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, + u32 pid, u32 seq, int type, unsigned int flags) + __releases(neigh->lock) + __acquires(neigh->lock) +{ + int err; + + read_lock_bh(&neigh->lock); + err = __neigh_fill_info(skb, neigh, pid, seq, type, flags); + read_unlock_bh(&neigh->lock); + + return err; +} + static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn, u32 pid, u32 seq, int type, unsigned int flags, struct neigh_table *tbl) |