mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-11-10 05:08:42 +00:00
b47eaefe12
Also fix several minor bugs and add 'limit' option for k-out-of-j link sensing strategy. Change default from 8-of-16 to 12-of-16. Change IHU expiry factor from 1.5 to 3.5 (as in RFC 6126).
355 lines
8.1 KiB
C
355 lines
8.1 KiB
C
/*
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* BIRD -- The Babel protocol
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*
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* Copyright (c) 2015--2016 Toke Hoiland-Jorgensen
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*
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* This file contains the data structures used by Babel.
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*/
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#ifndef _BIRD_BABEL_H_
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#define _BIRD_BABEL_H_
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#include "nest/bird.h"
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#include "nest/cli.h"
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#include "nest/iface.h"
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#include "nest/route.h"
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#include "nest/protocol.h"
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#include "nest/locks.h"
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#include "lib/resource.h"
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#include "lib/lists.h"
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#include "lib/socket.h"
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#include "lib/string.h"
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#include "sysdep/unix/timer.h"
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#define EA_BABEL_METRIC EA_CODE(EAP_BABEL, 0)
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#define EA_BABEL_ROUTER_ID EA_CODE(EAP_BABEL, 1)
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#define BABEL_MAGIC 42
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#define BABEL_VERSION 2
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#define BABEL_PORT 6696
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#define BABEL_INFINITY 0xFFFF
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#define BABEL_HELLO_INTERVAL_WIRED (4 S_) /* Default hello intervals in seconds */
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#define BABEL_HELLO_INTERVAL_WIRELESS (4 S_)
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#define BABEL_HELLO_LIMIT 12
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#define BABEL_UPDATE_INTERVAL_FACTOR 4
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#define BABEL_IHU_INTERVAL_FACTOR 3
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#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 */
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#define BABEL_ROUTE_EXPIRY_FACTOR(X) ((btime)(X)*7/2) /* 3.5 */
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#define BABEL_ROUTE_REFRESH_INTERVAL (2 S_) /* Time before route expiry to send route request */
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#define BABEL_HOLD_TIME (10 S_) /* Expiry time for our own routes */
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#define BABEL_SEQNO_REQUEST_EXPIRY (60 S_)
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#define BABEL_GARBAGE_INTERVAL (300 S_)
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#define BABEL_RXCOST_WIRED 96
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#define BABEL_RXCOST_WIRELESS 256
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#define BABEL_INITIAL_HOP_COUNT 255
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#define BABEL_MAX_SEND_INTERVAL 5 /* Unused ? */
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/* 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 */
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#define BABEL_MIN_INTERVAL (0x0001 * BABEL_TIME_UNITS)
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#define BABEL_MAX_INTERVAL (0xFFFF * BABEL_TIME_UNITS)
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#define BABEL_OVERHEAD (IP6_HEADER_LENGTH+UDP_HEADER_LENGTH)
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#define BABEL_MIN_MTU (512 + BABEL_OVERHEAD)
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enum babel_tlv_type {
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BABEL_TLV_PAD1 = 0,
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BABEL_TLV_PADN = 1,
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BABEL_TLV_ACK_REQ = 2,
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BABEL_TLV_ACK = 3,
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BABEL_TLV_HELLO = 4,
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BABEL_TLV_IHU = 5,
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BABEL_TLV_ROUTER_ID = 6,
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BABEL_TLV_NEXT_HOP = 7,
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BABEL_TLV_UPDATE = 8,
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BABEL_TLV_ROUTE_REQUEST = 9,
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BABEL_TLV_SEQNO_REQUEST = 10,
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/* extensions - not implemented
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BABEL_TLV_TS_PC = 11,
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BABEL_TLV_HMAC = 12,
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BABEL_TLV_SS_UPDATE = 13,
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BABEL_TLV_SS_REQUEST = 14,
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BABEL_TLV_SS_SEQNO_REQUEST = 15,
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*/
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BABEL_TLV_MAX
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};
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enum babel_subtlv_type {
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BABEL_SUBTLV_PAD1 = 0,
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BABEL_SUBTLV_PADN = 1
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};
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enum babel_iface_type {
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/* In practice, UNDEF and WIRED give equivalent behaviour */
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BABEL_IFACE_TYPE_UNDEF = 0,
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BABEL_IFACE_TYPE_WIRED = 1,
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BABEL_IFACE_TYPE_WIRELESS = 2,
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BABEL_IFACE_TYPE_MAX
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};
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enum babel_ae_type {
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BABEL_AE_WILDCARD = 0,
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BABEL_AE_IP4 = 1,
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BABEL_AE_IP6 = 2,
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BABEL_AE_IP6_LL = 3,
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BABEL_AE_MAX
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};
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struct babel_config {
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struct proto_config c;
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list iface_list; /* Patterns configured -- keep it first; see babel_reconfigure why */
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};
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struct babel_iface_config {
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struct iface_patt i;
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u16 rxcost;
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u8 type;
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u8 limit; /* Minimum number of Hellos to keep link up */
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u8 check_link;
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uint port;
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uint hello_interval; /* Hello interval, in us */
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uint ihu_interval; /* IHU interval, in us */
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uint update_interval; /* Update interval, in us */
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u16 rx_buffer; /* RX buffer size, 0 for MTU */
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u16 tx_length; /* TX packet length limit (including headers), 0 for MTU */
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int tx_tos;
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int tx_priority;
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ip_addr next_hop_ip4;
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ip_addr next_hop_ip6;
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};
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struct babel_proto {
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struct proto p;
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timer *timer;
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struct fib ip4_rtable;
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struct fib ip6_rtable;
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struct channel *ip4_channel;
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struct channel *ip6_channel;
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list interfaces; /* Interfaces we really know about (struct babel_iface) */
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u64 router_id;
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u16 update_seqno; /* To be increased on request */
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u8 update_seqno_inc; /* Request for update_seqno increase */
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u8 triggered; /* For triggering global updates */
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slab *route_slab;
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slab *source_slab;
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slab *msg_slab;
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slab *seqno_slab;
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list seqno_cache; /* Seqno requests in the cache (struct babel_seqno_request) */
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struct tbf log_pkt_tbf; /* TBF for packet messages */
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};
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struct babel_iface {
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node n;
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struct babel_proto *proto;
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struct iface *iface;
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struct babel_iface_config *cf;
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u8 up;
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pool *pool;
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char *ifname;
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sock *sk;
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ip_addr addr;
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ip_addr next_hop_ip4;
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ip_addr next_hop_ip6;
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int tx_length;
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list neigh_list; /* List of neighbors seen on this iface (struct babel_neighbor) */
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list msg_queue;
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u16 hello_seqno; /* To be increased on each hello */
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btime next_hello;
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btime next_regular;
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btime next_triggered;
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btime want_triggered;
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timer *timer;
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event *send_event;
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};
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struct babel_neighbor {
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node n;
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struct babel_iface *ifa;
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ip_addr addr;
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u16 rxcost; /* Sent in last IHU */
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u16 txcost; /* Received in last IHU */
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u16 cost; /* Computed neighbor cost */
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s8 ihu_cnt; /* IHU countdown, 0 to send it */
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u8 hello_cnt;
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u16 hello_map;
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u16 next_hello_seqno;
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uint last_hello_int;
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/* expiry timers */
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btime hello_expiry;
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btime ihu_expiry;
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list routes; /* Routes this neighbour has sent us (struct babel_route) */
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};
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struct babel_source {
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node n;
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u64 router_id;
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u16 seqno;
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u16 metric;
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btime expires;
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};
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struct babel_route {
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node n;
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node neigh_route;
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struct babel_entry *e;
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struct babel_neighbor *neigh;
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u16 seqno;
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u16 advert_metric;
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u16 metric;
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u16 old_metric;
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u64 router_id;
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ip_addr next_hop;
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btime refresh_time;
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btime expires;
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btime expiry_interval;
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};
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struct babel_entry {
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struct babel_proto *proto;
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struct babel_route *selected_in;
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struct babel_route *selected_out;
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btime updated;
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list sources; /* Source entries for this prefix (struct babel_source). */
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list routes; /* Routes for this prefix (struct babel_route) */
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struct fib_node n;
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};
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/* Stores forwarded seqno requests for duplicate suppression. */
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struct babel_seqno_request {
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node n;
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net_addr net;
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u64 router_id;
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u16 seqno;
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btime updated;
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};
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/*
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* Internal TLV messages
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*/
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struct babel_msg_ack_req {
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u8 type;
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u16 nonce;
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uint interval;
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ip_addr sender;
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};
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struct babel_msg_ack {
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u8 type;
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u16 nonce;
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};
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struct babel_msg_hello {
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u8 type;
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u16 seqno;
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uint interval;
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ip_addr sender;
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};
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struct babel_msg_ihu {
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u8 type;
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u8 ae;
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u16 rxcost;
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uint interval;
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ip_addr addr;
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ip_addr sender;
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};
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struct babel_msg_update {
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u8 type;
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u8 wildcard;
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uint interval;
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u16 seqno;
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u16 metric;
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u64 router_id;
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net_addr net;
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ip_addr next_hop;
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ip_addr sender;
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};
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struct babel_msg_route_request {
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u8 type;
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u8 full;
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net_addr net;
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};
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struct babel_msg_seqno_request {
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u8 type;
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u8 hop_count;
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u16 seqno;
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u64 router_id;
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net_addr net;
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ip_addr sender;
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};
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union babel_msg {
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u8 type;
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struct babel_msg_ack_req ack_req;
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struct babel_msg_ack ack;
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struct babel_msg_hello hello;
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struct babel_msg_ihu ihu;
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struct babel_msg_update update;
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struct babel_msg_route_request route_request;
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struct babel_msg_seqno_request seqno_request;
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};
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struct babel_msg_node {
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node n;
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union babel_msg msg;
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};
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/* babel.c */
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void babel_handle_ack_req(union babel_msg *msg, struct babel_iface *ifa);
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void babel_handle_ack(union babel_msg *msg, struct babel_iface *ifa);
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void babel_handle_hello(union babel_msg *msg, struct babel_iface *ifa);
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void babel_handle_ihu(union babel_msg *msg, struct babel_iface *ifa);
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void babel_handle_router_id(union babel_msg *msg, struct babel_iface *ifa);
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void babel_handle_update(union babel_msg *msg, struct babel_iface *ifa);
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void babel_handle_route_request(union babel_msg *msg, struct babel_iface *ifa);
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void babel_handle_seqno_request(union babel_msg *msg, struct babel_iface *ifa);
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void babel_show_interfaces(struct proto *P, char *iff);
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void babel_show_neighbors(struct proto *P, char *iff);
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void babel_show_entries(struct proto *P);
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/* packets.c */
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void babel_enqueue(union babel_msg *msg, struct babel_iface *ifa);
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void babel_send_unicast(union babel_msg *msg, struct babel_iface *ifa, ip_addr dest);
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int babel_open_socket(struct babel_iface *ifa);
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void babel_send_queue(void *arg);
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#endif
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