Commit 25d49e4d authored by Thomas Pedersen's avatar Thomas Pedersen Committed by John W. Linville
Browse files

mac80211: update mesh path selection frame format 



Make mesh path selection frames Mesh Action category, remove outdated
Mesh Path Selection category and defines, use updated reason codes, add
mesh_action_is_path_sel for readability, and update/correct path
selection IEs.

Signed-off-by: default avatarThomas Pedersen <thomas@cozybit.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 36c704fd

include/linux/ieee80211.h

+1 −3
Original line number Diff line number Diff line
@@ -629,6 +629,7 @@ struct ieee80211_rann_ie { 
	u8 rann_ttl;

	u8 rann_addr[6];

	u32 rann_seq;

	u32 rann_interval;

	u32 rann_metric;

} __attribute__ ((packed));
@@ -1269,9 +1270,6 @@ enum ieee80211_category { 
	WLAN_CATEGORY_MULTIHOP_ACTION = 14,

	WLAN_CATEGORY_SELF_PROTECTED = 15,

	WLAN_CATEGORY_WMM = 17,

	/* TODO: remove MESH_PATH_SEL after mesh is updated

	 * to current 802.11s draft  */

	WLAN_CATEGORY_MESH_PATH_SEL = 32,

	WLAN_CATEGORY_VENDOR_SPECIFIC_PROTECTED = 126,

	WLAN_CATEGORY_VENDOR_SPECIFIC = 127,

};

net/mac80211/mesh.c

+14 −6
Original line number Diff line number Diff line
@@ -13,10 +13,6 @@ 
#include "ieee80211_i.h"

#include "mesh.h"



#define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)

#define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)

#define IEEE80211_MESH_RANN_INTERVAL	     (1 * HZ)



#define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01

#define MESHCONF_CAPAB_FORWARDING    0x08
@@ -27,6 +23,17 @@ 
int mesh_allocated;

static struct kmem_cache *rm_cache;



#ifdef CONFIG_MAC80211_MESH

bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)

{

	return (mgmt->u.action.u.mesh_action.action_code ==

			WLAN_MESH_ACTION_HWMP_PATH_SELECTION);

}

#else

bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)

{ return false; }

#endif



void ieee80211s_init(void)

{

	mesh_pathtbl_init();
@@ -671,7 +678,8 @@ static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata, 
			break;

		}

		break;

	case WLAN_CATEGORY_MESH_PATH_SEL:

	case WLAN_CATEGORY_MESH_ACTION:

		if (mesh_action_is_path_sel(mgmt))

			mesh_rx_path_sel_frame(sdata, mgmt, len);

		break;

	}

net/mac80211/mesh.h

+4 −8
Original line number Diff line number Diff line
@@ -166,6 +166,9 @@ struct mesh_rmc { 
	u32 idx_mask;

};



#define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)

#define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)

#define IEEE80211_MESH_RANN_INTERVAL	     (1 * HZ)



#define MESH_DEFAULT_BEACON_INTERVAL		1000 	/* in 1024 us units */
@@ -177,14 +180,6 @@ struct mesh_rmc { 
/* Maximum number of paths per interface */

#define MESH_MAX_MPATHS		1024



/* Pending ANA approval */

#define MESH_PATH_SEL_ACTION	0



/* PERR reason codes */

#define PEER_RCODE_UNSPECIFIED  11

#define PERR_RCODE_NO_ROUTE     12

#define PERR_RCODE_DEST_UNREACH 13



/* Public interfaces */

/* Various */

int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
@@ -276,6 +271,7 @@ void mesh_path_quiesce(struct ieee80211_sub_if_data *sdata); 
void mesh_path_restart(struct ieee80211_sub_if_data *sdata);

void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata);



bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt);

extern int mesh_paths_generation;



#ifdef CONFIG_MAC80211_MESH

net/mac80211/mesh_hwmp.c

+37 −24
Original line number Diff line number Diff line
@@ -68,12 +68,12 @@ static inline u32 u16_field_get(u8 *preq_elem, int offset, bool ae) 
#define PREP_IE_FLAGS(x)	PREQ_IE_FLAGS(x)

#define PREP_IE_HOPCOUNT(x)	PREQ_IE_HOPCOUNT(x)

#define PREP_IE_TTL(x)		PREQ_IE_TTL(x)

#define PREP_IE_ORIG_ADDR(x)	(x + 3)

#define PREP_IE_ORIG_SN(x)	u32_field_get(x, 9, 0)

#define PREP_IE_ORIG_ADDR(x)	(AE_F_SET(x) ? x + 27 : x + 21)

#define PREP_IE_ORIG_SN(x)	u32_field_get(x, 27, AE_F_SET(x))

#define PREP_IE_LIFETIME(x)	u32_field_get(x, 13, AE_F_SET(x))

#define PREP_IE_METRIC(x)	u32_field_get(x, 17, AE_F_SET(x))

#define PREP_IE_TARGET_ADDR(x)	(AE_F_SET(x) ? x + 27 : x + 21)

#define PREP_IE_TARGET_SN(x)	u32_field_get(x, 27, AE_F_SET(x))

#define PREP_IE_TARGET_ADDR(x)	(x + 3)

#define PREP_IE_TARGET_SN(x)	u32_field_get(x, 9, 0)



#define PERR_IE_TTL(x)		(*(x))

#define PERR_IE_TARGET_FLAGS(x)	(*(x + 2))
@@ -132,8 +132,9 @@ static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, 
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);

	/* BSSID == SA */

	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);

	mgmt->u.action.category = WLAN_CATEGORY_MESH_PATH_SEL;

	mgmt->u.action.u.mesh_action.action_code = MESH_PATH_SEL_ACTION;

	mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;

	mgmt->u.action.u.mesh_action.action_code =

					WLAN_MESH_ACTION_HWMP_PATH_SELECTION;



	switch (action) {

	case MPATH_PREQ:
@@ -163,6 +164,12 @@ static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, 
	*pos++ = flags;

	*pos++ = hop_count;

	*pos++ = ttl;

	if (action == MPATH_PREP) {

		memcpy(pos, target, ETH_ALEN);

		pos += ETH_ALEN;

		memcpy(pos, &target_sn, 4);

		pos += 4;

	} else {

		if (action == MPATH_PREQ) {

			memcpy(pos, &preq_id, 4);

			pos += 4;
@@ -171,21 +178,23 @@ static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, 
		pos += ETH_ALEN;

		memcpy(pos, &orig_sn, 4);

		pos += 4;

	if (action != MPATH_RANN) {

		memcpy(pos, &lifetime, 4);

		pos += 4;

	}

	memcpy(pos, &lifetime, 4);	/* interval for RANN */

	pos += 4;

	memcpy(pos, &metric, 4);

	pos += 4;

	if (action == MPATH_PREQ) {

		/* destination count */

		*pos++ = 1;

		*pos++ = 1; /* destination count */

		*pos++ = target_flags;

	}

	if (action != MPATH_RANN) {

		memcpy(pos, target, ETH_ALEN);

		pos += ETH_ALEN;

		memcpy(pos, &target_sn, 4);

		pos += 4;

	} else if (action == MPATH_PREP) {

		memcpy(pos, orig_addr, ETH_ALEN);

		pos += ETH_ALEN;

		memcpy(pos, &orig_sn, 4);

		pos += 4;

	}



	ieee80211_tx_skb(sdata, skb);
@@ -224,9 +233,11 @@ int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn, 


	memcpy(mgmt->da, ra, ETH_ALEN);

	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);

	/* BSSID is left zeroed, wildcard value */

	mgmt->u.action.category = WLAN_CATEGORY_MESH_PATH_SEL;

	mgmt->u.action.u.mesh_action.action_code = MESH_PATH_SEL_ACTION;

	/* BSSID == SA */

	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);

	mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;

	mgmt->u.action.u.mesh_action.action_code =

					WLAN_MESH_ACTION_HWMP_PATH_SELECTION;

	ie_len = 15;

	pos = skb_put(skb, 2 + ie_len);

	*pos++ = WLAN_EID_PERR;
@@ -683,6 +694,7 @@ static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, 
	u8 ttl, flags, hopcount;

	u8 *orig_addr;

	u32 orig_sn, metric;

	u32 interval = cpu_to_le32(IEEE80211_MESH_RANN_INTERVAL);



	ttl = rann->rann_ttl;

	if (ttl <= 1) {
@@ -715,7 +727,7 @@ static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, 
		mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,

				       cpu_to_le32(orig_sn),

				       0, NULL, 0, broadcast_addr,

				       hopcount, ttl, 0,

				       hopcount, ttl, interval,

				       cpu_to_le32(metric + mpath->metric),

				       0, sdata);

		mpath->sn = orig_sn;
@@ -1006,10 +1018,11 @@ void 
mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata)

{

	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

	u32 interval = cpu_to_le32(IEEE80211_MESH_RANN_INTERVAL);



	mesh_path_sel_frame_tx(MPATH_RANN, 0, sdata->vif.addr,

			       cpu_to_le32(++ifmsh->sn),

			       0, NULL, 0, broadcast_addr,

			       0, sdata->u.mesh.mshcfg.element_ttl,

			       0, 0, 0, sdata);

			       interval, 0, 0, sdata);

}

net/mac80211/mesh_pathtbl.c

+4 −4
Original line number Diff line number Diff line
@@ -539,6 +539,7 @@ void mesh_plink_broken(struct sta_info *sta) 
	struct hlist_node *p;

	struct ieee80211_sub_if_data *sdata = sta->sdata;

	int i;

	__le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_DEST_UNREACHABLE);



	rcu_read_lock();

	tbl = rcu_dereference(mesh_paths);
@@ -553,8 +554,7 @@ void mesh_plink_broken(struct sta_info *sta) 
			spin_unlock_bh(&mpath->state_lock);

			mesh_path_error_tx(sdata->u.mesh.mshcfg.element_ttl,

					mpath->dst, cpu_to_le32(mpath->sn),

					cpu_to_le16(PERR_RCODE_DEST_UNREACH),

					bcast, sdata);

					reason, bcast, sdata);

		} else

		spin_unlock_bh(&mpath->state_lock);

	}
@@ -699,6 +699,7 @@ void mesh_path_discard_frame(struct sk_buff *skb, 
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

	struct mesh_path *mpath;

	u32 sn = 0;

	__le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD);



	if (memcmp(hdr->addr4, sdata->vif.addr, ETH_ALEN) != 0) {

		u8 *ra, *da;
@@ -709,8 +710,7 @@ void mesh_path_discard_frame(struct sk_buff *skb, 
		if (mpath)

			sn = ++mpath->sn;

		mesh_path_error_tx(sdata->u.mesh.mshcfg.element_ttl, skb->data,

				   cpu_to_le32(sn),

				   cpu_to_le16(PERR_RCODE_NO_ROUTE), ra, sdata);

				   cpu_to_le32(sn), reason, ra, sdata);

	}



	kfree_skb(skb);

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