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bird/proto/babel/babel.h
Ondrej Zajicek (work) 4324025f98 Babel: Add support for dual-stack IPv4/IPv6 operation 
This adds support for dual-stack v4/v6 operation to the Babel protocol.
Routing messages will be exchanged over IPv6, but IPv4 routes can be
carried in the messages being exchanged. This matches how the reference
Babel implementation (babeld) works.

The nexthop address for v4 can be configured per interface, and will
default to the first available IPv4 address on the given interface. For
symmetry, a configuration option to configure the IPv6 nexthop address
is also added.

Thanks to Toke Høiland-Jørgensen <toke@toke.dk> for the patch.
2017-06-08 12:18:16 +02:00

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/*
* BIRD -- The Babel protocol
*
* Copyright (c) 2015--2016 Toke Hoiland-Jorgensen
*
* Can be freely distributed and used under the terms of the GNU GPL.
*
* This file contains the data structures used by Babel.
*/
#ifndef _BIRD_BABEL_H_
#define _BIRD_BABEL_H_
#include "nest/bird.h"
#include "nest/cli.h"
#include "nest/iface.h"
#include "nest/route.h"
#include "nest/protocol.h"
#include "nest/locks.h"
#include "lib/resource.h"
#include "lib/lists.h"
#include "lib/socket.h"
#include "lib/string.h"
#include "sysdep/unix/timer.h"
#define EA_BABEL_METRIC EA_CODE(EAP_BABEL, 0)
#define EA_BABEL_ROUTER_ID EA_CODE(EAP_BABEL, 1)
#define BABEL_MAGIC 42
#define BABEL_VERSION 2
#define BABEL_PORT 6696
#define BABEL_INFINITY 0xFFFF
#define BABEL_HELLO_INTERVAL_WIRED 4 /* Default hello intervals in seconds */
#define BABEL_HELLO_INTERVAL_WIRELESS 4
#define BABEL_UPDATE_INTERVAL_FACTOR 4
#define BABEL_IHU_INTERVAL_FACTOR 3
#define BABEL_IHU_EXPIRY_FACTOR(X) ((X)*3/2) /* 1.5 */
#define BABEL_HELLO_EXPIRY_FACTOR(X) ((X)*3/2) /* 1.5 */
#define BABEL_ROUTE_EXPIRY_FACTOR(X) ((X)*7/2) /* 3.5 */
#define BABEL_ROUTE_REFRESH_INTERVAL 2 /* Seconds before route expiry to send route request */
#define BABEL_HOLD_TIME 10 /* Expiry time for our own routes */
#define BABEL_RXCOST_WIRED 96
#define BABEL_RXCOST_WIRELESS 256
#define BABEL_INITIAL_HOP_COUNT 255
#define BABEL_MAX_SEND_INTERVAL 5
#define BABEL_TIME_UNITS 100 /* On-wire times are counted in centiseconds */
#define BABEL_SEQNO_REQUEST_EXPIRY 60
#define BABEL_GARBAGE_INTERVAL 300
/* Max interval that will not overflow when carried as 16-bit centiseconds */
#define BABEL_MAX_INTERVAL (0xFFFF/BABEL_TIME_UNITS)
#define BABEL_OVERHEAD (IP6_HEADER_LENGTH+UDP_HEADER_LENGTH)
#define BABEL_MIN_MTU (512 + BABEL_OVERHEAD)
enum babel_tlv_type {
BABEL_TLV_PAD1 = 0,
BABEL_TLV_PADN = 1,
BABEL_TLV_ACK_REQ = 2,
BABEL_TLV_ACK = 3,
BABEL_TLV_HELLO = 4,
BABEL_TLV_IHU = 5,
BABEL_TLV_ROUTER_ID = 6,
BABEL_TLV_NEXT_HOP = 7,
BABEL_TLV_UPDATE = 8,
BABEL_TLV_ROUTE_REQUEST = 9,
BABEL_TLV_SEQNO_REQUEST = 10,
/* extensions - not implemented
BABEL_TLV_TS_PC = 11,
BABEL_TLV_HMAC = 12,
BABEL_TLV_SS_UPDATE = 13,
BABEL_TLV_SS_REQUEST = 14,
BABEL_TLV_SS_SEQNO_REQUEST = 15,
*/
BABEL_TLV_MAX
};
enum babel_iface_type {
/* In practice, UNDEF and WIRED give equivalent behaviour */
BABEL_IFACE_TYPE_UNDEF = 0,
BABEL_IFACE_TYPE_WIRED = 1,
BABEL_IFACE_TYPE_WIRELESS = 2,
BABEL_IFACE_TYPE_MAX
};
enum babel_ae_type {
BABEL_AE_WILDCARD = 0,
BABEL_AE_IP4 = 1,
BABEL_AE_IP6 = 2,
BABEL_AE_IP6_LL = 3,
BABEL_AE_MAX
};
struct babel_config {
struct proto_config c;
list iface_list; /* Patterns configured -- keep it first; see babel_reconfigure why */
};
struct babel_iface_config {
struct iface_patt i;
u16 rxcost;
u8 type;
u8 check_link;
uint port;
u16 hello_interval;
u16 ihu_interval;
u16 update_interval;
u16 rx_buffer; /* RX buffer size, 0 for MTU */
u16 tx_length; /* TX packet length limit (including headers), 0 for MTU */
int tx_tos;
int tx_priority;
ip_addr next_hop_ip4;
ip_addr next_hop_ip6;
};
struct babel_proto {
struct proto p;
timer *timer;
struct fib ip4_rtable;
struct fib ip6_rtable;
struct channel *ip4_channel;
struct channel *ip6_channel;
list interfaces; /* Interfaces we really know about (struct babel_iface) */
u64 router_id;
u16 update_seqno; /* To be increased on request */
u8 triggered; /* For triggering global updates */
slab *route_slab;
slab *source_slab;
slab *msg_slab;
slab *seqno_slab;
list seqno_cache; /* Seqno requests in the cache (struct babel_seqno_request) */
struct tbf log_pkt_tbf; /* TBF for packet messages */
};
struct babel_iface {
node n;
struct babel_proto *proto;
struct iface *iface;
struct babel_iface_config *cf;
u8 up;
pool *pool;
char *ifname;
sock *sk;
ip_addr addr;
ip_addr next_hop_ip4;
ip_addr next_hop_ip6;
int tx_length;
list neigh_list; /* List of neighbors seen on this iface (struct babel_neighbor) */
list msg_queue;
u16 hello_seqno; /* To be increased on each hello */
bird_clock_t next_hello;
bird_clock_t next_regular;
bird_clock_t next_triggered;
bird_clock_t want_triggered;
timer *timer;
event *send_event;
};
struct babel_neighbor {
node n;
struct babel_iface *ifa;
ip_addr addr;
u16 txcost;
u8 hello_cnt;
u16 hello_map;
u16 next_hello_seqno;
/* expiry timers */
bird_clock_t hello_expiry;
bird_clock_t ihu_expiry;
list routes; /* Routes this neighbour has sent us (struct babel_route) */
};
struct babel_source {
node n;
u64 router_id;
u16 seqno;
u16 metric;
bird_clock_t expires;
};
struct babel_route {
node n;
node neigh_route;
struct babel_entry *e;
struct babel_neighbor *neigh;
u16 seqno;
u16 advert_metric;
u16 metric;
u64 router_id;
ip_addr next_hop;
bird_clock_t refresh_time;
bird_clock_t expires;
u16 expiry_interval;
};
struct babel_entry {
struct babel_proto *proto;
struct babel_route *selected_in;
struct babel_route *selected_out;
bird_clock_t updated;
list sources; /* Source entries for this prefix (struct babel_source). */
list routes; /* Routes for this prefix (struct babel_route) */
struct fib_node n;
};
/* Stores forwarded seqno requests for duplicate suppression. */
struct babel_seqno_request {
node n;
net_addr net;
u64 router_id;
u16 seqno;
bird_clock_t updated;
};
/*
* Internal TLV messages
*/
struct babel_msg_ack_req {
u8 type;
u16 nonce;
u16 interval;
ip_addr sender;
};
struct babel_msg_ack {
u8 type;
u16 nonce;
};
struct babel_msg_hello {
u8 type;
u16 seqno;
u16 interval;
ip_addr sender;
};
struct babel_msg_ihu {
u8 type;
u8 ae;
u16 rxcost;
u16 interval;
ip_addr addr;
ip_addr sender;
};
struct babel_msg_update {
u8 type;
u8 wildcard;
u16 interval;
u16 seqno;
u16 metric;
u64 router_id;
net_addr net;
ip_addr next_hop;
ip_addr sender;
};
struct babel_msg_route_request {
u8 type;
u8 full;
net_addr net;
};
struct babel_msg_seqno_request {
u8 type;
u8 hop_count;
u16 seqno;
u64 router_id;
net_addr net;
ip_addr sender;
};
union babel_msg {
u8 type;
struct babel_msg_ack_req ack_req;
struct babel_msg_ack ack;
struct babel_msg_hello hello;
struct babel_msg_ihu ihu;
struct babel_msg_update update;
struct babel_msg_route_request route_request;
struct babel_msg_seqno_request seqno_request;
};
struct babel_msg_node {
node n;
union babel_msg msg;
};
/* babel.c */
void babel_handle_ack_req(union babel_msg *msg, struct babel_iface *ifa);
void babel_handle_ack(union babel_msg *msg, struct babel_iface *ifa);
void babel_handle_hello(union babel_msg *msg, struct babel_iface *ifa);
void babel_handle_ihu(union babel_msg *msg, struct babel_iface *ifa);
void babel_handle_router_id(union babel_msg *msg, struct babel_iface *ifa);
void babel_handle_update(union babel_msg *msg, struct babel_iface *ifa);
void babel_handle_route_request(union babel_msg *msg, struct babel_iface *ifa);
void babel_handle_seqno_request(union babel_msg *msg, struct babel_iface *ifa);
void babel_show_interfaces(struct proto *P, char *iff);
void babel_show_neighbors(struct proto *P, char *iff);
void babel_show_entries(struct proto *P);
/* packets.c */
void babel_enqueue(union babel_msg *msg, struct babel_iface *ifa);
void babel_send_unicast(union babel_msg *msg, struct babel_iface *ifa, ip_addr dest);
int babel_open_socket(struct babel_iface *ifa);
void babel_send_queue(void *arg);
#endif
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