bird/proto/babel/babel.h

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/*
* BIRD -- The Babel protocol
*
* Copyright (c) 2015--2016 Toke Hoiland-Jorgensen
* (c) 2016--2017 Ondrej Zajicek <santiago@crfreenet.org>
* (c) 2016--2017 CZ.NIC z.s.p.o.
*
* 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 "lib/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
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#define BABEL_HELLO_INTERVAL_WIRED (4 S_) /* Default hello intervals in seconds */
#define BABEL_HELLO_INTERVAL_WIRELESS (4 S_)
#define BABEL_HELLO_LIMIT 12
#define BABEL_UPDATE_INTERVAL_FACTOR 4
#define BABEL_IHU_INTERVAL_FACTOR 3
#define BABEL_HOLD_TIME_FACTOR 4 /* How long we keep unreachable route relative to update interval */
#define BABEL_IHU_EXPIRY_FACTOR(X) ((btime)(X)*7/2) /* 3.5 */
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#define BABEL_HELLO_EXPIRY_FACTOR(X) ((btime)(X)*3/2) /* 1.5 */
#define BABEL_ROUTE_EXPIRY_FACTOR(X) ((btime)(X)*7/2) /* 3.5 */
#define BABEL_ROUTE_REFRESH_FACTOR(X) ((btime)(X)*5/2) /* 2.5 */
#define BABEL_SEQNO_REQUEST_RETRY 4
#define BABEL_SEQNO_REQUEST_EXPIRY (2 S_)
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#define BABEL_GARBAGE_INTERVAL (300 S_)
#define BABEL_RXCOST_WIRED 96
#define BABEL_RXCOST_WIRELESS 256
#define BABEL_INITIAL_HOP_COUNT 255
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#define BABEL_MAX_SEND_INTERVAL 5 /* Unused ? */
/* Max interval that will not overflow when carried as 16-bit centiseconds */
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#define BABEL_TIME_UNITS 10000 /* On-wire times are counted in centiseconds */
#define BABEL_MIN_INTERVAL (0x0001 * BABEL_TIME_UNITS)
#define BABEL_MAX_INTERVAL (0xFFFF * BABEL_TIME_UNITS)
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#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_subtlv_type {
BABEL_SUBTLV_PAD1 = 0,
BABEL_SUBTLV_PADN = 1
};
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; /* List of iface configs (struct babel_iface_config) */
uint hold_time; /* Time to hold stale entries and unreachable routes */
};
struct babel_iface_config {
struct iface_patt i;
u16 rxcost;
u8 type;
u8 limit; /* Minimum number of Hellos to keep link up */
u8 check_link;
uint port;
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uint hello_interval; /* Hello interval, in us */
uint ihu_interval; /* IHU interval, in us */
uint update_interval; /* Update interval, in us */
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 */
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u8 update_seqno_inc; /* Request for update_seqno increase */
u8 triggered; /* For triggering global updates */
slab *route_slab;
slab *source_slab;
slab *msg_slab;
slab *seqno_slab;
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 */
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btime next_hello;
btime next_regular;
btime next_triggered;
btime want_triggered;
timer *timer;
event *send_event;
};
struct babel_neighbor {
node n;
struct babel_iface *ifa;
ip_addr addr;
uint uc; /* Reference counter for seqno requests */
u16 rxcost; /* Sent in last IHU */
u16 txcost; /* Received in last IHU */
u16 cost; /* Computed neighbor cost */
s8 ihu_cnt; /* IHU countdown, 0 to send it */
u8 hello_cnt;
u16 hello_map;
u16 next_hello_seqno;
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uint last_hello_int;
/* expiry timers */
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btime hello_expiry;
btime 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;
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btime expires;
};
struct babel_route {
node n;
node neigh_route;
struct babel_entry *e;
struct babel_neighbor *neigh;
u8 feasible;
u16 seqno;
u16 metric;
u16 advert_metric;
u64 router_id;
ip_addr next_hop;
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btime refresh_time;
btime expires;
};
struct babel_seqno_request {
node n;
u64 router_id;
u16 seqno;
u8 hop_count;
u8 count;
btime expires;
struct babel_neighbor *nbr;
};
struct babel_entry {
struct babel_route *selected;
list routes; /* Routes for this prefix (struct babel_route) */
list sources; /* Source entries for this prefix (struct babel_source). */
list requests;
u8 valid; /* Entry validity state (BABEL_ENTRY_*) */
u8 unreachable; /* Unreachable route is announced */
u16 seqno; /* Outgoing seqno */
u16 metric; /* Outgoing metric */
u64 router_id; /* Outgoing router ID */
btime updated; /* Last change of outgoing rte, for triggered updates */
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struct fib_node n;
};
#define BABEL_ENTRY_DUMMY 0 /* No outgoing route */
#define BABEL_ENTRY_VALID 1 /* Valid outgoing route */
#define BABEL_ENTRY_STALE 2 /* Stale outgoing route, waiting for GC */
/*
* Internal TLV messages
*/
struct babel_msg_ack_req {
u8 type;
u16 nonce;
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uint interval;
ip_addr sender;
};
struct babel_msg_ack {
u8 type;
u16 nonce;
};
struct babel_msg_hello {
u8 type;
u16 seqno;
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uint interval;
ip_addr sender;
};
struct babel_msg_ihu {
u8 type;
u8 ae;
u16 rxcost;
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uint interval;
ip_addr addr;
ip_addr sender;
};
struct babel_msg_update {
u8 type;
u8 wildcard;
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uint interval;
u16 seqno;
u16 metric;
u64 router_id;
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net_addr net;
ip_addr next_hop;
ip_addr sender;
};
struct babel_msg_route_request {
u8 type;
u8 full;
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net_addr net;
};
struct babel_msg_seqno_request {
u8 type;
u8 hop_count;
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u16 seqno;
u64 router_id;
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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);
void babel_show_routes(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