From 3c5772a5279de9eadfff7adb5ddea08106495fff Mon Sep 17 00:00:00 2001 From: Javier Cardona Date: Mon, 10 Aug 2009 12:15:48 -0700 Subject: mac80211: Use 3-address format for mesh broadcast frames. The 11s task group recently changed the frame mesh multicast/broadcast frame format to use 3-address. This was done to avoid interactions with widely deployed lazy-WDS access points. This patch changes the format of group addressed frames, both mesh-originated and proxied, to use the data format defined in draft D2.08 and forward. The address fields used for group addressed frames is: In 802.11 header ToDS:0 FromDS:1 addr1: DA (broadcast/multicast address) addr2: TA addr3: Mesh SA In address extension header: addr4: SA (only present if frame was proxied) Note that this change breaks backward compatibility with earlier mesh stack versions. Signed-off-by: Andrey Yurovsky Signed-off-by: Javier Cardona Signed-off-by: John W. Linville --- net/mac80211/mesh.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 58 insertions(+), 4 deletions(-) (limited to 'net/mac80211/mesh.c') diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c index 8c068e215fb..10d93386042 100644 --- a/net/mac80211/mesh.c +++ b/net/mac80211/mesh.c @@ -398,22 +398,76 @@ endgrow: return NULL; } +/** + * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame + * @hdr: 802.11 frame header + * @fc: frame control field + * @meshda: destination address in the mesh + * @meshsa: source address address in the mesh. Same as TA, as frame is + * locally originated. + * + * Return the length of the 802.11 (does not include a mesh control header) + */ +int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, char + *meshda, char *meshsa) { + if (is_multicast_ether_addr(meshda)) { + *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); + /* DA TA SA */ + memcpy(hdr->addr1, meshda, ETH_ALEN); + memcpy(hdr->addr2, meshsa, ETH_ALEN); + memcpy(hdr->addr3, meshsa, ETH_ALEN); + return 24; + } else { + *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | + IEEE80211_FCTL_TODS); + /* RA TA DA SA */ + memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */ + memcpy(hdr->addr2, meshsa, ETH_ALEN); + memcpy(hdr->addr3, meshda, ETH_ALEN); + memcpy(hdr->addr4, meshsa, ETH_ALEN); + return 30; + } +} + /** * ieee80211_new_mesh_header - create a new mesh header * @meshhdr: uninitialized mesh header * @sdata: mesh interface to be used + * @addr4: addr4 of the mesh frame (1st in ae header) + * may be NULL + * @addr5: addr5 of the mesh frame (1st or 2nd in ae header) + * may be NULL unless addr6 is present + * @addr6: addr6 of the mesh frame (2nd or 3rd in ae header) + * may be NULL unless addr5 is present * * Return the header length. */ int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr, - struct ieee80211_sub_if_data *sdata) + struct ieee80211_sub_if_data *sdata, char *addr4, + char *addr5, char *addr6) { - meshhdr->flags = 0; + int aelen = 0; + memset(meshhdr, 0, sizeof(meshhdr)); meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum); sdata->u.mesh.mesh_seqnum++; - - return 6; + if (addr4) { + meshhdr->flags |= MESH_FLAGS_AE_A4; + aelen += ETH_ALEN; + memcpy(meshhdr->eaddr1, addr4, ETH_ALEN); + } + if (addr5 && addr6) { + meshhdr->flags |= MESH_FLAGS_AE_A5_A6; + aelen += 2 * ETH_ALEN; + if (!addr4) { + memcpy(meshhdr->eaddr1, addr5, ETH_ALEN); + memcpy(meshhdr->eaddr2, addr6, ETH_ALEN); + } else { + memcpy(meshhdr->eaddr2, addr5, ETH_ALEN); + memcpy(meshhdr->eaddr3, addr6, ETH_ALEN); + } + } + return 6 + aelen; } static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata, -- cgit v1.2.3