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mac80211: update PERR frame format
Update the PERR IE frame format according to latest draft (3.03). Signed-off-by: Rui Paulo <rpaulo@gmail.com> Signed-off-by: Javier Cardona <javier@cozybit.com> Reviewed-by: Andrey Yurovsky <andrey@cozybit.com> Tested-by: Brian Cavagnolo <brian@cozybit.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Rui Paulo
John W. Linville
parent
90a5e16992
commit
d611f062f4
3 changed files with 60 additions and 13 deletions
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@ -210,6 +210,11 @@ struct mesh_rmc {
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#define MESH_PATH_SEL_CATEGORY 32
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#define MESH_PATH_SEL_ACTION 0
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/* PERR reason codes */
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#define PEER_RCODE_UNSPECIFIED 11
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#define PERR_RCODE_NO_ROUTE 12
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#define PERR_RCODE_DEST_UNREACH 13
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/* Public interfaces */
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/* Various */
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int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
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@ -275,8 +280,8 @@ void mesh_mpp_table_grow(void);
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u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata,
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struct mesh_table *tbl);
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/* Mesh paths */
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int mesh_path_error_tx(u8 *dest, __le32 dest_dsn, u8 *ra,
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struct ieee80211_sub_if_data *sdata);
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int mesh_path_error_tx(u8 ttl, u8 *dest, __le32 dest_dsn, __le16 dest_rcode,
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u8 *ra, struct ieee80211_sub_if_data *sdata);
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void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta);
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void mesh_path_flush_pending(struct mesh_path *mpath);
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void mesh_path_tx_pending(struct mesh_path *mpath);
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@ -27,6 +27,10 @@
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#define MP_F_DO 0x1
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/* Reply and forward */
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#define MP_F_RF 0x2
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/* Unknown Sequence Number */
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#define MP_F_USN 0x01
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/* Reason code Present */
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#define MP_F_RCODE 0x02
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static void mesh_queue_preq(struct mesh_path *, u8);
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@ -37,6 +41,13 @@ static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae)
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return get_unaligned_le32(preq_elem + offset);
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}
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static inline u32 u16_field_get(u8 *preq_elem, int offset, bool ae)
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{
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if (ae)
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offset += 6;
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return get_unaligned_le16(preq_elem + offset);
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}
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/* HWMP IE processing macros */
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#define AE_F (1<<6)
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#define AE_F_SET(x) (*x & AE_F)
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@ -63,8 +74,11 @@ static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae)
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#define PREP_IE_DST_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21)
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#define PREP_IE_DST_DSN(x) u32_field_get(x, 27, AE_F_SET(x));
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#define PERR_IE_DST_ADDR(x) (x + 2)
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#define PERR_IE_DST_DSN(x) u32_field_get(x, 8, 0);
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#define PERR_IE_TTL(x) (*(x))
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#define PERR_IE_DST_FLAGS(x) (*(x + 2))
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#define PERR_IE_DST_ADDR(x) (x + 3)
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#define PERR_IE_DST_DSN(x) u32_field_get(x, 9, 0);
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#define PERR_IE_DST_RCODE(x) u16_field_get(x, 13, 0);
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#define MSEC_TO_TU(x) (x*1000/1024)
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#define DSN_GT(x, y) ((long) (y) - (long) (x) < 0)
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@ -181,8 +195,8 @@ static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags,
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* @dst_dsn: dsn of the broken destination
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* @ra: node this frame is addressed to
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*/
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int mesh_path_error_tx(u8 *dst, __le32 dst_dsn, u8 *ra,
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struct ieee80211_sub_if_data *sdata)
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int mesh_path_error_tx(u8 ttl, u8 *dst, __le32 dst_dsn, __le16 dst_rcode,
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u8 *ra, struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_local *local = sdata->local;
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struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
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@ -207,17 +221,29 @@ int mesh_path_error_tx(u8 *dst, __le32 dst_dsn, u8 *ra,
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/* BSSID is left zeroed, wildcard value */
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mgmt->u.action.category = MESH_PATH_SEL_CATEGORY;
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mgmt->u.action.u.mesh_action.action_code = MESH_PATH_SEL_ACTION;
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ie_len = 12;
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ie_len = 15;
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pos = skb_put(skb, 2 + ie_len);
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*pos++ = WLAN_EID_PERR;
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*pos++ = ie_len;
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/* mode flags, reserved */
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*pos++ = 0;
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/* ttl */
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*pos++ = MESH_TTL;
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/* number of destinations */
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*pos++ = 1;
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/*
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* flags bit, bit 1 is unset if we know the sequence number and
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* bit 2 is set if we have a reason code
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*/
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*pos = 0;
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if (!dst_dsn)
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*pos |= MP_F_USN;
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if (dst_rcode)
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*pos |= MP_F_RCODE;
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pos++;
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memcpy(pos, dst, ETH_ALEN);
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pos += ETH_ALEN;
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memcpy(pos, &dst_dsn, 4);
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pos += 4;
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memcpy(pos, &dst_rcode, 2);
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ieee80211_tx_skb(sdata, skb, 1);
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return 0;
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@ -598,13 +624,26 @@ fail:
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static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_mgmt *mgmt, u8 *perr_elem)
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{
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struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
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struct mesh_path *mpath;
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u8 ttl;
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u8 *ta, *dst_addr;
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u8 dst_flags;
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u32 dst_dsn;
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u16 dst_rcode;
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ta = mgmt->sa;
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ttl = PERR_IE_TTL(perr_elem);
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if (ttl <= 1) {
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ifmsh->mshstats.dropped_frames_ttl++;
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return;
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}
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ttl--;
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dst_flags = PERR_IE_DST_FLAGS(perr_elem);
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dst_addr = PERR_IE_DST_ADDR(perr_elem);
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dst_dsn = PERR_IE_DST_DSN(perr_elem);
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dst_rcode = PERR_IE_DST_RCODE(perr_elem);
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rcu_read_lock();
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mpath = mesh_path_lookup(dst_addr, sdata);
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if (mpath) {
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@ -616,7 +655,8 @@ static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
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mpath->flags &= ~MESH_PATH_ACTIVE;
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mpath->dsn = dst_dsn;
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spin_unlock_bh(&mpath->state_lock);
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mesh_path_error_tx(dst_addr, cpu_to_le32(dst_dsn),
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mesh_path_error_tx(ttl, dst_addr, cpu_to_le32(dst_dsn),
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cpu_to_le16(dst_rcode),
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sdata->dev->broadcast, sdata);
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} else
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spin_unlock_bh(&mpath->state_lock);
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@ -711,7 +751,7 @@ void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
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last_hop_metric);
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}
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if (elems.perr) {
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if (elems.perr_len != 12)
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if (elems.perr_len != 15)
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/* Right now we support only one destination per PERR */
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return;
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hwmp_perr_frame_process(sdata, mgmt, elems.perr);
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@ -465,8 +465,9 @@ void mesh_plink_broken(struct sta_info *sta)
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mpath->flags &= ~MESH_PATH_ACTIVE;
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++mpath->dsn;
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spin_unlock_bh(&mpath->state_lock);
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mesh_path_error_tx(mpath->dst,
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mesh_path_error_tx(MESH_TTL, mpath->dst,
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cpu_to_le32(mpath->dsn),
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PERR_RCODE_DEST_UNREACH,
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sdata->dev->broadcast, sdata);
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} else
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spin_unlock_bh(&mpath->state_lock);
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@ -611,7 +612,8 @@ void mesh_path_discard_frame(struct sk_buff *skb,
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mpath = mesh_path_lookup(da, sdata);
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if (mpath)
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dsn = ++mpath->dsn;
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mesh_path_error_tx(skb->data, cpu_to_le32(dsn), ra, sdata);
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mesh_path_error_tx(MESH_TTL, skb->data, cpu_to_le32(dsn),
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PERR_RCODE_NO_ROUTE, ra, sdata);
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}
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kfree_skb(skb);
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