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wifi: mac80211: fix race in mesh sequence number assignment

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Since the sequence number is shared across different tx queues, it needs
to be atomic in order to avoid accidental duplicate assignment

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20230314095956.62085-2-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau 2023-03-14 10:59:51 +01:00 committed by Johannes Berg
parent 61587f1556
commit e626dad923
2 changed files with 3 additions and 5 deletions
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2
net/mac80211/ieee80211_i.h
View file

@ -696,7 +696,7 @@ struct ieee80211_if_mesh {
struct mesh_stats mshstats;
struct mesh_config mshcfg;
atomic_t estab_plinks;
u32 mesh_seqnum;
atomic_t mesh_seqnum;
bool accepting_plinks;
int num_gates;
struct beacon_data __rcu *beacon;

6
net/mac80211/mesh.c
View file

@ -752,10 +752,8 @@ unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
/* FIXME: racy -- TX on multiple queues can be concurrent */
put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
sdata->u.mesh.mesh_seqnum++;
put_unaligned_le32(atomic_inc_return(&sdata->u.mesh.mesh_seqnum),
&meshhdr->seqnum);
if (addr4or5 && !addr6) {
meshhdr->flags |= MESH_FLAGS_AE_A4;
memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);