mac80211: mac80211: Check SN for deactivated mpaths (d8f0300a) · Commits · 戴 / test

When processing a PREQ or PREP it's critical to use the incoming SN. If that is improperly done routing loops and other types of badness can happen. But the code was always processing path messages for deactivated paths. This path fixes that so that if we have a valid SN then we use it to verify that it is a message we can accept. For reference the relevant section of the standard is 13.10.8.4 which doesn't address the deactivated path case at all. I also included a special case for when our peer reboots or restarts networking. This is an important case because without it there can be a very long delay before we accept path messages from that peer. It's also a simple case and intimately associated with processing messages for deactivated paths so I used one patch instead of two. Signed-off-by:

Alexis Green <agreen@cococorp.com> Signed-off-by:

Johannes Berg <johannes.berg@intel.com>

net/mac80211/mesh_hwmp.c

+26 −0

Original line number	Diff line number	Diff line
		@@ -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);

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