diff options
| -rw-r--r-- | net/mac80211/mesh_hwmp.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c index 5ed38c5a998f..f053213e5adb 100644 --- a/net/mac80211/mesh_hwmp.c +++ b/net/mac80211/mesh_hwmp.c @@ -79,6 +79,12 @@ static inline u16 u16_field_get(const u8 *preq_elem, int offset, bool ae) #define MSEC_TO_TU(x) (x*1000/1024) #define SN_GT(x, y) ((s32)(y - x) < 0) #define SN_LT(x, y) ((s32)(x - y) < 0) +#define MAX_SANE_SN_DELTA 32 + +static inline u32 SN_DELTA(u32 x, u32 y) +{ + return x >= y ? x - y : y - x; +} #define net_traversal_jiffies(s) \ msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) @@ -441,6 +447,26 @@ static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, process = false; fresh_info = false; } + } else if (!(mpath->flags & MESH_PATH_ACTIVE)) { + bool have_sn, newer_sn, bounced; + + have_sn = mpath->flags & MESH_PATH_SN_VALID; + newer_sn = have_sn && SN_GT(orig_sn, mpath->sn); + bounced = have_sn && + (SN_DELTA(orig_sn, mpath->sn) > + MAX_SANE_SN_DELTA); + + if (!have_sn || newer_sn) { + /* if SN is newer than what we had + * then we can take it */; + } else if (bounced) { + /* if SN is way different than what + * we had then assume the other side + * rebooted or restarted */; + } else { + process = false; + fresh_info = false; + } } } else { mpath = mesh_path_add(sdata, orig_addr); |