23721387c4
This second version of the bridge loop avoidance for batman-adv avoids loops between the mesh and a backbone (usually a LAN). By connecting multiple batman-adv mesh nodes to the same ethernet segment a loop can be created when the soft-interface is bridged into that ethernet segment. A simple visualization of the loop involving the most common case - a LAN as ethernet segment: node1 <-- LAN --> node2 | | wifi <-- mesh --> wifi Packets from the LAN (e.g. ARP broadcasts) will circle forever from node1 or node2 over the mesh back into the LAN. With this patch, batman recognizes backbone gateways, nodes which are part of the mesh and backbone/LAN at the same time. Each backbone gateway "claims" clients from within the mesh to handle them exclusively. By restricting that only responsible backbone gateways may handle their claimed clients traffic, loops are effectively avoided. Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
225 lines
5.5 KiB
C
225 lines
5.5 KiB
C
/*
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* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*
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*/
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#ifndef _NET_BATMAN_ADV_PACKET_H_
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#define _NET_BATMAN_ADV_PACKET_H_
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#define ETH_P_BATMAN 0x4305 /* unofficial/not registered Ethertype */
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enum bat_packettype {
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BAT_OGM = 0x01,
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BAT_ICMP = 0x02,
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BAT_UNICAST = 0x03,
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BAT_BCAST = 0x04,
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BAT_VIS = 0x05,
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BAT_UNICAST_FRAG = 0x06,
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BAT_TT_QUERY = 0x07,
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BAT_ROAM_ADV = 0x08
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};
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/* this file is included by batctl which needs these defines */
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#define COMPAT_VERSION 14
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enum batman_flags {
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PRIMARIES_FIRST_HOP = 1 << 4,
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VIS_SERVER = 1 << 5,
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DIRECTLINK = 1 << 6
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};
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/* ICMP message types */
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enum icmp_packettype {
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ECHO_REPLY = 0,
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DESTINATION_UNREACHABLE = 3,
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ECHO_REQUEST = 8,
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TTL_EXCEEDED = 11,
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PARAMETER_PROBLEM = 12
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};
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/* vis defines */
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enum vis_packettype {
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VIS_TYPE_SERVER_SYNC = 0,
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VIS_TYPE_CLIENT_UPDATE = 1
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};
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/* fragmentation defines */
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enum unicast_frag_flags {
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UNI_FRAG_HEAD = 1 << 0,
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UNI_FRAG_LARGETAIL = 1 << 1
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};
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/* TT_QUERY subtypes */
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#define TT_QUERY_TYPE_MASK 0x3
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enum tt_query_packettype {
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TT_REQUEST = 0,
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TT_RESPONSE = 1
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};
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/* TT_QUERY flags */
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enum tt_query_flags {
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TT_FULL_TABLE = 1 << 2
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};
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/* TT_CLIENT flags.
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* Flags from 1 to 1 << 7 are sent on the wire, while flags from 1 << 8 to
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* 1 << 15 are used for local computation only */
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enum tt_client_flags {
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TT_CLIENT_DEL = 1 << 0,
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TT_CLIENT_ROAM = 1 << 1,
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TT_CLIENT_WIFI = 1 << 2,
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TT_CLIENT_NOPURGE = 1 << 8,
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TT_CLIENT_NEW = 1 << 9,
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TT_CLIENT_PENDING = 1 << 10
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};
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/* claim frame types for the bridge loop avoidance */
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enum bla_claimframe {
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CLAIM_TYPE_ADD = 0x00,
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CLAIM_TYPE_DEL = 0x01,
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CLAIM_TYPE_ANNOUNCE = 0x02,
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CLAIM_TYPE_REQUEST = 0x03
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};
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/* the destination hardware field in the ARP frame is used to
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* transport the claim type and the group id
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*/
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struct bla_claim_dst {
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uint8_t magic[3]; /* FF:43:05 */
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uint8_t type; /* bla_claimframe */
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uint16_t group; /* group id */
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} __packed;
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struct batman_header {
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uint8_t packet_type;
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uint8_t version; /* batman version field */
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uint8_t ttl;
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} __packed;
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struct batman_ogm_packet {
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struct batman_header header;
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uint8_t flags; /* 0x40: DIRECTLINK flag, 0x20 VIS_SERVER flag... */
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uint32_t seqno;
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uint8_t orig[ETH_ALEN];
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uint8_t prev_sender[ETH_ALEN];
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uint8_t gw_flags; /* flags related to gateway class */
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uint8_t tq;
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uint8_t tt_num_changes;
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uint8_t ttvn; /* translation table version number */
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uint16_t tt_crc;
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} __packed;
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#define BATMAN_OGM_LEN sizeof(struct batman_ogm_packet)
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struct icmp_packet {
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struct batman_header header;
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uint8_t msg_type; /* see ICMP message types above */
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uint8_t dst[ETH_ALEN];
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uint8_t orig[ETH_ALEN];
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uint16_t seqno;
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uint8_t uid;
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uint8_t reserved;
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} __packed;
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#define BAT_RR_LEN 16
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/* icmp_packet_rr must start with all fields from imcp_packet
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* as this is assumed by code that handles ICMP packets */
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struct icmp_packet_rr {
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struct batman_header header;
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uint8_t msg_type; /* see ICMP message types above */
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uint8_t dst[ETH_ALEN];
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uint8_t orig[ETH_ALEN];
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uint16_t seqno;
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uint8_t uid;
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uint8_t rr_cur;
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uint8_t rr[BAT_RR_LEN][ETH_ALEN];
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} __packed;
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struct unicast_packet {
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struct batman_header header;
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uint8_t ttvn; /* destination translation table version number */
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uint8_t dest[ETH_ALEN];
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} __packed;
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struct unicast_frag_packet {
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struct batman_header header;
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uint8_t ttvn; /* destination translation table version number */
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uint8_t dest[ETH_ALEN];
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uint8_t flags;
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uint8_t align;
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uint8_t orig[ETH_ALEN];
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uint16_t seqno;
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} __packed;
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struct bcast_packet {
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struct batman_header header;
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uint8_t reserved;
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uint32_t seqno;
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uint8_t orig[ETH_ALEN];
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} __packed;
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struct vis_packet {
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struct batman_header header;
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uint8_t vis_type; /* which type of vis-participant sent this? */
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uint32_t seqno; /* sequence number */
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uint8_t entries; /* number of entries behind this struct */
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uint8_t reserved;
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uint8_t vis_orig[ETH_ALEN]; /* originator reporting its neighbors */
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uint8_t target_orig[ETH_ALEN]; /* who should receive this packet */
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uint8_t sender_orig[ETH_ALEN]; /* who sent or forwarded this packet */
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} __packed;
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struct tt_query_packet {
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struct batman_header header;
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/* the flag field is a combination of:
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* - TT_REQUEST or TT_RESPONSE
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* - TT_FULL_TABLE */
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uint8_t flags;
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uint8_t dst[ETH_ALEN];
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uint8_t src[ETH_ALEN];
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/* the ttvn field is:
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* if TT_REQUEST: ttvn that triggered the
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* request
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* if TT_RESPONSE: new ttvn for the src
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* orig_node */
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uint8_t ttvn;
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/* tt_data field is:
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* if TT_REQUEST: crc associated with the
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* ttvn
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* if TT_RESPONSE: table_size */
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uint16_t tt_data;
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} __packed;
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struct roam_adv_packet {
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struct batman_header header;
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uint8_t reserved;
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uint8_t dst[ETH_ALEN];
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uint8_t src[ETH_ALEN];
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uint8_t client[ETH_ALEN];
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} __packed;
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struct tt_change {
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uint8_t flags;
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uint8_t addr[ETH_ALEN];
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} __packed;
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#endif /* _NET_BATMAN_ADV_PACKET_H_ */
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