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linux-next/net/batman-adv/packet.h
Simon Wunderlich da6b8c20a5 batman-adv: generalize batman-adv icmp packet handling
Instead of handling icmp packets only up to length of icmp_packet_rr,
the code should handle any icmp length size. Therefore the length
truncating is moved to when the packet is actually sent to userspace
(this does not support lengths longer than icmp_packet_rr yet). Longer
packets are forwarded without truncating.

This patch also cleans up some parts where the icmp header struct could
be used instead of other icmp_packet(_rr) structs to make the code more
readable.

Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
2013-10-23 17:03:47 +02:00

445 lines
13 KiB
C

/* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*/
#ifndef _NET_BATMAN_ADV_PACKET_H_
#define _NET_BATMAN_ADV_PACKET_H_
/**
* enum batadv_packettype - types for batman-adv encapsulated packets
* @BATADV_IV_OGM: originator messages for B.A.T.M.A.N. IV
* @BATADV_BCAST: broadcast packets carrying broadcast payload
* @BATADV_CODED: network coded packets
*
* @BATADV_UNICAST: unicast packets carrying unicast payload traffic
* @BATADV_UNICAST_FRAG: unicast packets carrying a fragment of the original
* payload packet
* @BATADV_UNICAST_4ADDR: unicast packet including the originator address of
* the sender
* @BATADV_ICMP: unicast packet like IP ICMP used for ping or traceroute
* @BATADV_UNICAST_TVLV: unicast packet carrying TVLV containers
*/
enum batadv_packettype {
/* 0x00 - 0x3f: local packets or special rules for handling */
BATADV_IV_OGM = 0x00,
BATADV_BCAST = 0x01,
BATADV_CODED = 0x02,
/* 0x40 - 0x7f: unicast */
#define BATADV_UNICAST_MIN 0x40
BATADV_UNICAST = 0x40,
BATADV_UNICAST_FRAG = 0x41,
BATADV_UNICAST_4ADDR = 0x42,
BATADV_ICMP = 0x43,
BATADV_UNICAST_TVLV = 0x44,
#define BATADV_UNICAST_MAX 0x7f
/* 0x80 - 0xff: reserved */
};
/**
* enum batadv_subtype - packet subtype for unicast4addr
* @BATADV_P_DATA: user payload
* @BATADV_P_DAT_DHT_GET: DHT request message
* @BATADV_P_DAT_DHT_PUT: DHT store message
* @BATADV_P_DAT_CACHE_REPLY: ARP reply generated by DAT
*/
enum batadv_subtype {
BATADV_P_DATA = 0x01,
BATADV_P_DAT_DHT_GET = 0x02,
BATADV_P_DAT_DHT_PUT = 0x03,
BATADV_P_DAT_CACHE_REPLY = 0x04,
};
/* this file is included by batctl which needs these defines */
#define BATADV_COMPAT_VERSION 15
/**
* enum batadv_iv_flags - flags used in B.A.T.M.A.N. IV OGM packets
* @BATADV_NOT_BEST_NEXT_HOP: flag is set when ogm packet is forwarded and was
* previously received from someone else than the best neighbor.
* @BATADV_PRIMARIES_FIRST_HOP: flag is set when the primary interface address
* is used, and the packet travels its first hop.
* @BATADV_DIRECTLINK: flag is for the first hop or if rebroadcasted from a
* one hop neighbor on the interface where it was originally received.
*/
enum batadv_iv_flags {
BATADV_NOT_BEST_NEXT_HOP = BIT(0),
BATADV_PRIMARIES_FIRST_HOP = BIT(1),
BATADV_DIRECTLINK = BIT(2),
};
/* ICMP message types */
enum batadv_icmp_packettype {
BATADV_ECHO_REPLY = 0,
BATADV_DESTINATION_UNREACHABLE = 3,
BATADV_ECHO_REQUEST = 8,
BATADV_TTL_EXCEEDED = 11,
BATADV_PARAMETER_PROBLEM = 12,
};
/* tt data subtypes */
#define BATADV_TT_DATA_TYPE_MASK 0x0F
/**
* enum batadv_tt_data_flags - flags for tt data tvlv
* @BATADV_TT_OGM_DIFF: TT diff propagated through OGM
* @BATADV_TT_REQUEST: TT request message
* @BATADV_TT_RESPONSE: TT response message
* @BATADV_TT_FULL_TABLE: contains full table to replace existing table
*/
enum batadv_tt_data_flags {
BATADV_TT_OGM_DIFF = BIT(0),
BATADV_TT_REQUEST = BIT(1),
BATADV_TT_RESPONSE = BIT(2),
BATADV_TT_FULL_TABLE = BIT(4),
};
/* BATADV_TT_CLIENT flags.
* Flags from BIT(0) to BIT(7) are sent on the wire, while flags from BIT(8) to
* BIT(15) are used for local computation only.
* Flags from BIT(4) to BIT(7) are kept in sync with the rest of the network.
*/
enum batadv_tt_client_flags {
BATADV_TT_CLIENT_DEL = BIT(0),
BATADV_TT_CLIENT_ROAM = BIT(1),
BATADV_TT_CLIENT_WIFI = BIT(4),
BATADV_TT_CLIENT_NOPURGE = BIT(8),
BATADV_TT_CLIENT_NEW = BIT(9),
BATADV_TT_CLIENT_PENDING = BIT(10),
BATADV_TT_CLIENT_TEMP = BIT(11),
};
/**
* batadv_vlan_flags - flags for the four MSB of any vlan ID field
* @BATADV_VLAN_HAS_TAG: whether the field contains a valid vlan tag or not
*/
enum batadv_vlan_flags {
BATADV_VLAN_HAS_TAG = BIT(15),
};
/* claim frame types for the bridge loop avoidance */
enum batadv_bla_claimframe {
BATADV_CLAIM_TYPE_CLAIM = 0x00,
BATADV_CLAIM_TYPE_UNCLAIM = 0x01,
BATADV_CLAIM_TYPE_ANNOUNCE = 0x02,
BATADV_CLAIM_TYPE_REQUEST = 0x03,
};
/**
* enum batadv_tvlv_type - tvlv type definitions
* @BATADV_TVLV_GW: gateway tvlv
* @BATADV_TVLV_DAT: distributed arp table tvlv
* @BATADV_TVLV_NC: network coding tvlv
* @BATADV_TVLV_TT: translation table tvlv
* @BATADV_TVLV_ROAM: roaming advertisement tvlv
*/
enum batadv_tvlv_type {
BATADV_TVLV_GW = 0x01,
BATADV_TVLV_DAT = 0x02,
BATADV_TVLV_NC = 0x03,
BATADV_TVLV_TT = 0x04,
BATADV_TVLV_ROAM = 0x05,
};
/* the destination hardware field in the ARP frame is used to
* transport the claim type and the group id
*/
struct batadv_bla_claim_dst {
uint8_t magic[3]; /* FF:43:05 */
uint8_t type; /* bla_claimframe */
__be16 group; /* group id */
};
struct batadv_header {
uint8_t packet_type;
uint8_t version; /* batman version field */
uint8_t ttl;
/* the parent struct has to add a byte after the header to make
* everything 4 bytes aligned again
*/
};
/**
* struct batadv_ogm_packet - ogm (routing protocol) packet
* @header: common batman packet header
* @flags: contains routing relevant flags - see enum batadv_iv_flags
* @tvlv_len: length of tvlv data following the ogm header
*/
struct batadv_ogm_packet {
struct batadv_header header;
uint8_t flags;
__be32 seqno;
uint8_t orig[ETH_ALEN];
uint8_t prev_sender[ETH_ALEN];
uint8_t reserved;
uint8_t tq;
__be16 tvlv_len;
/* __packed is not needed as the struct size is divisible by 4,
* and the largest data type in this struct has a size of 4.
*/
};
#define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet)
/**
* batadv_icmp_header - common ICMP header
* @header: common batman header
* @msg_type: ICMP packet type
* @dst: address of the destination node
* @orig: address of the source node
* @uid: local ICMP socket identifier
*/
struct batadv_icmp_header {
struct batadv_header header;
uint8_t msg_type; /* see ICMP message types above */
uint8_t dst[ETH_ALEN];
uint8_t orig[ETH_ALEN];
uint8_t uid;
};
/**
* batadv_icmp_packet - ICMP packet
* @icmph: common ICMP header
* @reserved: not used - useful for alignment
* @seqno: ICMP sequence number
*/
struct batadv_icmp_packet {
struct batadv_icmp_header icmph;
uint8_t reserved;
__be16 seqno;
};
#define BATADV_RR_LEN 16
/**
* batadv_icmp_packet_rr - ICMP RouteRecord packet
* @icmph: common ICMP header
* @rr_cur: number of entries the rr array
* @seqno: ICMP sequence number
* @rr: route record array
*/
struct batadv_icmp_packet_rr {
struct batadv_icmp_header icmph;
uint8_t rr_cur;
__be16 seqno;
uint8_t rr[BATADV_RR_LEN][ETH_ALEN];
};
#define BATADV_ICMP_MAX_PACKET_SIZE sizeof(struct batadv_icmp_packet_rr)
/* All packet headers in front of an ethernet header have to be completely
* divisible by 2 but not by 4 to make the payload after the ethernet
* header again 4 bytes boundary aligned.
*
* A packing of 2 is necessary to avoid extra padding at the end of the struct
* caused by a structure member which is larger than two bytes. Otherwise
* the structure would not fulfill the previously mentioned rule to avoid the
* misalignment of the payload after the ethernet header. It may also lead to
* leakage of information when the padding it not initialized before sending.
*/
#pragma pack(2)
struct batadv_unicast_packet {
struct batadv_header header;
uint8_t ttvn; /* destination translation table version number */
uint8_t dest[ETH_ALEN];
/* "4 bytes boundary + 2 bytes" long to make the payload after the
* following ethernet header again 4 bytes boundary aligned
*/
};
/**
* struct batadv_unicast_4addr_packet - extended unicast packet
* @u: common unicast packet header
* @src: address of the source
* @subtype: packet subtype
*/
struct batadv_unicast_4addr_packet {
struct batadv_unicast_packet u;
uint8_t src[ETH_ALEN];
uint8_t subtype;
uint8_t reserved;
/* "4 bytes boundary + 2 bytes" long to make the payload after the
* following ethernet header again 4 bytes boundary aligned
*/
};
/**
* struct batadv_frag_packet - fragmented packet
* @header: common batman packet header with type, compatversion, and ttl
* @dest: final destination used when routing fragments
* @orig: originator of the fragment used when merging the packet
* @no: fragment number within this sequence
* @reserved: reserved byte for alignment
* @seqno: sequence identification
* @total_size: size of the merged packet
*/
struct batadv_frag_packet {
struct batadv_header header;
#if defined(__BIG_ENDIAN_BITFIELD)
uint8_t no:4;
uint8_t reserved:4;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
uint8_t reserved:4;
uint8_t no:4;
#else
#error "unknown bitfield endianess"
#endif
uint8_t dest[ETH_ALEN];
uint8_t orig[ETH_ALEN];
__be16 seqno;
__be16 total_size;
};
struct batadv_bcast_packet {
struct batadv_header header;
uint8_t reserved;
__be32 seqno;
uint8_t orig[ETH_ALEN];
/* "4 bytes boundary + 2 bytes" long to make the payload after the
* following ethernet header again 4 bytes boundary aligned
*/
};
#pragma pack()
/**
* struct batadv_coded_packet - network coded packet
* @header: common batman packet header and ttl of first included packet
* @reserved: Align following fields to 2-byte boundaries
* @first_source: original source of first included packet
* @first_orig_dest: original destinal of first included packet
* @first_crc: checksum of first included packet
* @first_ttvn: tt-version number of first included packet
* @second_ttl: ttl of second packet
* @second_dest: second receiver of this coded packet
* @second_source: original source of second included packet
* @second_orig_dest: original destination of second included packet
* @second_crc: checksum of second included packet
* @second_ttvn: tt version number of second included packet
* @coded_len: length of network coded part of the payload
*/
struct batadv_coded_packet {
struct batadv_header header;
uint8_t first_ttvn;
/* uint8_t first_dest[ETH_ALEN]; - saved in mac header destination */
uint8_t first_source[ETH_ALEN];
uint8_t first_orig_dest[ETH_ALEN];
__be32 first_crc;
uint8_t second_ttl;
uint8_t second_ttvn;
uint8_t second_dest[ETH_ALEN];
uint8_t second_source[ETH_ALEN];
uint8_t second_orig_dest[ETH_ALEN];
__be32 second_crc;
__be16 coded_len;
};
/**
* struct batadv_unicast_tvlv - generic unicast packet with tvlv payload
* @header: common batman packet header
* @reserved: reserved field (for packet alignment)
* @src: address of the source
* @dst: address of the destination
* @tvlv_len: length of tvlv data following the unicast tvlv header
* @align: 2 bytes to align the header to a 4 byte boundry
*/
struct batadv_unicast_tvlv_packet {
struct batadv_header header;
uint8_t reserved;
uint8_t dst[ETH_ALEN];
uint8_t src[ETH_ALEN];
__be16 tvlv_len;
uint16_t align;
};
/**
* struct batadv_tvlv_hdr - base tvlv header struct
* @type: tvlv container type (see batadv_tvlv_type)
* @version: tvlv container version
* @len: tvlv container length
*/
struct batadv_tvlv_hdr {
uint8_t type;
uint8_t version;
__be16 len;
};
/**
* struct batadv_tvlv_gateway_data - gateway data propagated through gw tvlv
* container
* @bandwidth_down: advertised uplink download bandwidth
* @bandwidth_up: advertised uplink upload bandwidth
*/
struct batadv_tvlv_gateway_data {
__be32 bandwidth_down;
__be32 bandwidth_up;
};
/**
* struct batadv_tvlv_tt_data - tt data propagated through the tt tvlv container
* @flags: translation table flags (see batadv_tt_data_flags)
* @ttvn: translation table version number
* @vlan_num: number of announced VLANs. In the TVLV this struct is followed by
* one batadv_tvlv_tt_vlan_data object per announced vlan
*/
struct batadv_tvlv_tt_data {
uint8_t flags;
uint8_t ttvn;
__be16 num_vlan;
};
/**
* struct batadv_tvlv_tt_vlan_data - vlan specific tt data propagated through
* the tt tvlv container
* @crc: crc32 checksum of the entries belonging to this vlan
* @vid: vlan identifier
* @reserved: unused, useful for alignment purposes
*/
struct batadv_tvlv_tt_vlan_data {
__be32 crc;
__be16 vid;
uint16_t reserved;
};
/**
* struct batadv_tvlv_tt_change - translation table diff data
* @flags: status indicators concerning the non-mesh client (see
* batadv_tt_client_flags)
* @reserved: reserved field
* @addr: mac address of non-mesh client that triggered this tt change
* @vid: VLAN identifier
*/
struct batadv_tvlv_tt_change {
uint8_t flags;
uint8_t reserved;
uint8_t addr[ETH_ALEN];
__be16 vid;
};
/**
* struct batadv_tvlv_roam_adv - roaming advertisement
* @client: mac address of roaming client
* @vid: VLAN identifier
*/
struct batadv_tvlv_roam_adv {
uint8_t client[ETH_ALEN];
__be16 vid;
};
#endif /* _NET_BATMAN_ADV_PACKET_H_ */