mirrors/bird
mirrors/bird
0
0
Fork 0
mirror of https://gitlab.nic.cz/labs/bird.git synced 2024-11-09 12:48:43 +00:00
Code Releases Activity
bc591061f6
bird/proto/ospf/ospf.h
Ondrej Zajicek (work) bc591061f6 OSPF: Packets on PtP networks should be always sent to AllSPFRouters 
As specified in RFC 2328 8.1: "On physical point-to-point networks,
the IP destination is always set to the address AllSPFRouters."

Note that this likely break setups with multiple neighbors on a network
configured as PtP, which worked before. These should be configured as
PtMP.

Thanks to Senthil Kumar Nagappan for the original patch and to Joakim
Tjernlund for suggestions.
2021-05-09 15:26:13 +02:00

1125 lines
34 KiB
C
Raw Blame History

/*
* BIRD -- OSPF
*
* (c) 1999--2005 Ondrej Filip <feela@network.cz>
* (c) 2009--2014 Ondrej Zajicek <santiago@crfreenet.org>
* (c) 2009--2014 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_OSPF_H_
#define _BIRD_OSPF_H_
#include "nest/bird.h"
#include "lib/checksum.h"
#include "lib/idm.h"
#include "lib/lists.h"
#include "lib/slists.h"
#include "lib/socket.h"
#include "lib/timer.h"
#include "lib/resource.h"
#include "nest/protocol.h"
#include "nest/iface.h"
#include "nest/route.h"
#include "nest/cli.h"
#include "nest/locks.h"
#include "nest/bfd.h"
#include "conf/conf.h"
#include "lib/string.h"
#ifdef LOCAL_DEBUG
#define OSPF_FORCE_DEBUG 1
#else
#define OSPF_FORCE_DEBUG 0
#endif
#define OSPF_TRACE(flags, msg, args...) \
do { if ((p->p.debug & flags) || OSPF_FORCE_DEBUG) \
log(L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
#define OSPF_PACKET(dumpfn, buffer, msg, args...) \
do { if ((p->p.debug & D_PACKETS) || OSPF_FORCE_DEBUG) \
{ log(L_TRACE "%s: " msg, p->p.name, ## args ); dumpfn(p, buffer); } } while(0)
#define LOG_PKT(msg, args...) \
log_rl(&p->log_pkt_tbf, L_REMOTE "%s: " msg, p->p.name, args)
#define LOG_PKT_AUTH(msg, args...) \
log_rl(&p->log_pkt_tbf, L_AUTH "%s: " msg, p->p.name, args)
#define LOG_PKT_WARN(msg, args...) \
log_rl(&p->log_pkt_tbf, L_WARN "%s: " msg, p->p.name, args)
#define LOG_LSA1(msg, args...) \
log_rl(&p->log_lsa_tbf, L_REMOTE "%s: " msg, p->p.name, args)
#define LOG_LSA2(msg, args...) \
do { if (! p->log_lsa_tbf.drop) \
log(L_REMOTE "%s: " msg, p->p.name, args); } while(0)
#define OSPF_PROTO 89
#define LSREFRESHTIME 1800 /* 30 minutes */
#define MINLSINTERVAL (5 S_)
#define MINLSARRIVAL (1 S_)
#define LSINFINITY 0xffffff
#define OSPF_PKT_TYPES 5 /* HELLO_P .. LSACK_P */
#define OSPF3_CRYPTO_ID 1 /* OSPFv3 Cryptographic Protocol ID */
#define OSPF_DEFAULT_TICK 1
#define OSPF_DEFAULT_STUB_COST 1000
#define OSPF_DEFAULT_ECMP_LIMIT 16
#define OSPF_DEFAULT_GR_TIME 120
#define OSPF_DEFAULT_TRANSINT 40
#define OSPF_MIN_PKT_SIZE 256
#define OSPF_MAX_PKT_SIZE 65535
#define OSPF_VLINK_ID_OFFSET 0x80000000
#define OSPF_GR_ABLE 1
#define OSPF_GR_AWARE 2
struct ospf_config
{
struct proto_config c;
uint tick;
u8 ospf2;
u8 af_ext;
u8 af_mc;
u8 rfc1583;
u8 stub_router;
u8 merge_external;
u8 instance_id;
u8 instance_id_set;
u8 abr;
u8 asbr;
u8 vpn_pe;
u8 gr_mode; /* Graceful restart mode (OSPF_GR_*) */
uint gr_time; /* Graceful restart interval */
uint ecmp;
list area_list; /* list of area configs (struct ospf_area_config) */
list vlink_list; /* list of configured vlinks (struct ospf_iface_patt) */
};
struct ospf_area_config
{
node n;
u32 areaid;
u32 default_cost; /* Cost of default route for stub areas
(With possible LSA_EXT3_EBIT for NSSA areas) */
u8 type; /* Area type (standard, stub, NSSA), represented
by option flags (OPT_E, OPT_N) */
u8 summary; /* Import summaries to this stub/NSSA area, valid for ABR */
u8 default_nssa; /* Generate default NSSA route for NSSA+summary area */
u8 translator; /* Translator role, for NSSA ABR */
u32 transint; /* Translator stability interval */
list patt_list; /* List of iface configs (struct ospf_iface_patt) */
list net_list; /* List of aggregate networks for that area */
list enet_list; /* List of aggregate external (NSSA) networks */
list stubnet_list; /* List of stub networks added to Router LSA */
};
struct area_net_config
{
node n;
net_addr prefix;
u32 tag;
u8 hidden;
};
struct area_net
{
u32 metric; /* With possible LSA_EXT3_EBIT for NSSA area nets */
u32 tag;
u8 hidden;
u8 active;
struct fib_node fn;
};
struct ospf_stubnet_config
{
node n;
net_addr prefix;
u32 cost;
u8 hidden;
u8 summary;
};
struct nbma_node
{
node n;
ip_addr ip;
byte eligible;
byte found;
};
struct ospf_iface_patt
{
struct iface_patt i;
u32 type;
u32 stub;
u32 cost;
u32 helloint;
u32 rxmtint;
u32 pollint;
u32 waitint;
u32 deadc;
u32 deadint;
u32 inftransdelay;
list nbma_list;
u32 priority;
u32 voa;
u32 vid;
int tx_tos;
int tx_priority;
u16 tx_length;
u16 rx_buffer;
#define OSPF_RXBUF_MINSIZE 256 /* Minimal allowed size */
u8 instance_id;
u8 instance_id_set;
u8 autype; /* OSPF_AUTH_*, not really used in OSPFv3 */
u8 strictnbma;
u8 check_link;
u8 ecmp_weight;
u8 link_lsa_suppression;
u8 real_bcast; /* Not really used in OSPFv3 */
u8 ptp_netmask; /* bool + 2 for unspecified */
u8 ptp_address; /* bool + 2 for unspecified */
u8 ttl_security; /* bool + 2 for TX only */
u8 bfd;
list *passwords;
};
/* Default values for interface parameters */
#define COST_D 10
#define RXMTINT_D 5
#define INFTRANSDELAY_D 1
#define PRIORITY_D 1
#define HELLOINT_D 10
#define POLLINT_D 20
#define DEADC_D 4
#define WAIT_DMH 4
/* Value of Wait timer - not found it in RFC * - using 4*HELLO */
struct ospf_proto
{
struct proto p;
timer *disp_timer; /* OSPF proto dispatcher */
uint tick;
struct top_graph *gr; /* LSA graph */
slist lsal; /* List of all LSA's */
int calcrt; /* Routing table calculation scheduled?
0=no, 1=normal, 2=forced reload */
list iface_list; /* List of OSPF interfaces (struct ospf_iface) */
list area_list; /* List of OSPF areas (struct ospf_area) */
int areano; /* Number of area I belong to */
int padj; /* Number of neighbors in Exchange or Loading state */
int gr_count; /* Number of neighbors in graceful restart state */
u8 gr_recovery; /* Graceful restart recovery is active */
u8 gr_cleanup; /* GR cleanup scheduled */
btime gr_timeout; /* The end time of grace restart recovery */
struct fib rtf; /* Routing table */
struct idm idm; /* OSPFv3 LSA ID map */
u8 ospf2; /* OSPF v2 or v3 */
u8 af_ext; /* OSPFv3-AF extension */
u8 af_mc; /* OSPFv3-AF multicast */
u8 rfc1583; /* RFC1583 compatibility */
u8 stub_router; /* Do not forward transit traffic */
u8 merge_external; /* Should i merge external routes? */
u8 instance_id; /* Differentiate between more OSPF instances */
u8 asbr; /* May i originate any ext/NSSA lsa? */
u8 vpn_pe; /* Should we do VPN PE specific behavior (RFC 4577)? */
u8 ecmp; /* Maximal number of nexthops in ECMP route, or 0 */
u8 gr_mode; /* Graceful restart mode (OSPF_GR_*) */
uint gr_time; /* Graceful restart interval */
u64 csn64; /* Last used cryptographic sequence number */
struct ospf_area *backbone; /* If exists */
event *flood_event; /* Event for flooding LS updates */
void *lsab; /* LSA buffer used when originating router LSAs */
int lsab_size, lsab_used;
linpool *nhpool; /* Linpool used for next hops computed in SPF */
sock *vlink_sk; /* IP socket used for vlink TX */
u32 router_id;
u32 last_vlink_id; /* Interface IDs for vlinks (starts at 0x80000000) */
struct tbf log_pkt_tbf; /* TBF for packet messages */
struct tbf log_lsa_tbf; /* TBF for LSA messages */
};
struct ospf_area
{
node n;
u32 areaid;
struct ospf_area_config *ac; /* Related area config */
struct top_hash_entry *rt; /* My own router LSA */
struct top_hash_entry *pxr_lsa; /* Originated prefix LSA */
list cand; /* List of candidates for RT calc. */
struct fib net_fib; /* Networks to advertise or not */
struct fib enet_fib; /* External networks for NSSAs */
u32 options; /* Optional features */
u8 update_rt_lsa; /* Rt lsa origination scheduled? */
u8 trcap; /* Transit capability? */
u8 marked; /* Used in OSPF reconfigure */
u8 translate; /* Translator state (TRANS_*), for NSSA ABR */
timer *translator_timer; /* For NSSA translator switch */
struct ospf_proto *po;
struct fib rtr; /* Routing tables for routers */
};
struct ospf_iface
{
node n;
struct iface *iface; /* Nest's iface (NULL for vlinks) */
struct ifa *addr; /* IP prefix associated with that OSPF iface */
struct ospf_area *oa;
struct ospf_iface_patt *cf;
char *ifname; /* Interface name (iface->name), new one for vlinks */
pool *pool;
sock *sk; /* IP socket */
list neigh_list; /* List of neighbors (struct ospf_neighbor) */
u32 cost; /* Cost of iface */
u32 waitint; /* Number of seconds before changing state from wait */
u32 rxmtint; /* Number of seconds between LSA retransmissions */
u32 pollint; /* Poll interval in seconds */
u32 deadint; /* After deadint seconds without hellos is router dead */
u32 iface_id; /* Interface ID (iface->index or new value for vlinks) */
u32 vid; /* ID of peer of virtual link */
ip_addr vip; /* IP of peer of virtual link */
struct ospf_iface *vifa; /* OSPF iface which the vlink goes through */
struct ospf_area *voa; /* OSPF area which the vlink goes through */
u16 inftransdelay; /* The estimated number of seconds it takes to
transmit a Link State Update Packet over this
interface. LSAs contained in the update */
u16 helloint; /* number of seconds between hello sending */
list *passwords;
u32 csn; /* Last used crypt seq number */
btime csn_use; /* Last time when packet with that CSN was sent */
ip_addr all_routers; /* Multicast (or broadcast) address for all routers */
ip_addr des_routers; /* Multicast (or NULL) address for designated routers */
ip_addr drip; /* Designated router IP */
ip_addr bdrip; /* Backup DR IP */
u32 drid; /* DR Router ID */
u32 bdrid; /* BDR Router ID */
s16 rt_pos_beg; /* Position of iface in Router-LSA, begin, inclusive */
s16 rt_pos_end; /* Position of iface in Router-LSA, end, exclusive */
s16 px_pos_beg; /* Position of iface in Rt Prefix-LSA, begin, inclusive */
s16 px_pos_end; /* Position of iface in Rt Prefix-LSA, end, exclusive */
u32 dr_iface_id; /* if drid is valid, this is iface_id of DR (for connecting network) */
u8 instance_id; /* Used to differentiate between more OSPF
instances on one interface */
u8 autype; /* Authentication type (OSPF_AUTH_*) */
u8 type; /* OSPF view of type (OSPF_IT_*) */
u8 strictnbma; /* Can I talk with unknown neighbors? */
u8 stub; /* Inactive interface */
u8 state; /* Interface state machine (OSPF_IS_*) */
timer *wait_timer; /* WAIT timer */
timer *hello_timer; /* HELLOINT timer */
timer *poll_timer; /* Poll Interval - for NBMA */
struct top_hash_entry *link_lsa; /* Originated link LSA */
struct top_hash_entry *net_lsa; /* Originated network LSA */
struct top_hash_entry *pxn_lsa; /* Originated prefix LSA */
struct top_hash_entry **flood_queue; /* LSAs queued for LSUPD */
u8 update_link_lsa;
u8 update_net_lsa;
u16 flood_queue_used; /* The current number of LSAs in flood_queue */
u16 flood_queue_size; /* The maximum number of LSAs in flood_queue */
int fadj; /* Number of fully adjacent neighbors */
list nbma_list;
u8 priority; /* A router priority for DR election */
u8 ioprob;
#define OSPF_I_OK 0 /* Everything OK */
#define OSPF_I_SK 1 /* Socket open failed */
#define OSPF_I_LL 2 /* Missing link-local address (OSPFv3) */
u8 sk_dr; /* Socket is a member of designated routers group */
u8 marked; /* Used in OSPF reconfigure, 2 for force restart */
u16 rxbuf; /* Buffer size */
u16 tx_length; /* Soft TX packet length limit, usually MTU */
u16 tx_hdrlen; /* Expected packet header length, less than tx_length */
u8 check_link; /* Whether iface link change is used */
u8 ecmp_weight; /* Weight used for ECMP */
u8 link_lsa_suppression; /* Suppression of Link-LSA origination */
u8 ptp_netmask; /* Send real netmask for P2P */
u8 ptp_address; /* Send IP address in data field for PtP */
u8 check_ttl; /* Check incoming packets for TTL 255 */
u8 bfd; /* Use BFD on iface */
};
struct ospf_neighbor
{
node n;
pool *pool;
struct ospf_iface *ifa;
u8 state;
u8 gr_active; /* We act as GR helper for the neighbor */
u8 got_my_rt_lsa; /* Received my Rt-LSA in DBDES exchanged */
timer *inactim; /* Inactivity timer */
u8 imms; /* I, M, Master/slave received */
u8 myimms; /* I, M Master/slave */
u32 dds; /* DD Sequence number being sent */
u32 ddr; /* last Dat Des packet received */
u32 rid; /* Router ID */
ip_addr ip; /* IP of it's interface */
u8 priority; /* Priority */
u32 options; /* Options received */
/* Entries dr and bdr store IP addresses in OSPFv2 and router IDs in
OSPFv3, we use the same type to simplify handling */
u32 dr; /* Neighbor's idea of DR */
u32 bdr; /* Neighbor's idea of BDR */
u32 iface_id; /* ID of Neighbour's iface connected to common network */
/* Database summary list iterator, controls initial dbdes exchange.
* Advances in the LSA list as dbdes packets are sent.
*/
siterator dbsi; /* iterator of po->lsal */
/* Link state request list, controls initial LSA exchange.
* Entries added when received in dbdes packets, removed as sent in lsreq packets.
*/
slist lsrql; /* slist of struct top_hash_entry from n->lsrqh */
struct top_graph *lsrqh;
struct top_hash_entry *lsrqi; /* Pointer to the first unsent node in lsrql */
/* Link state retransmission list, controls LSA retransmission during flood.
* Entries added as sent in lsupd packets, removed when received in lsack packets.
* These entries hold ret_count in appropriate LSA entries.
*/
slist lsrtl; /* slist of struct top_hash_entry from n->lsrth */
struct top_graph *lsrth;
timer *dbdes_timer; /* DBDES exchange timer */
timer *lsrq_timer; /* LSA request timer */
timer *lsrt_timer; /* LSA retransmission timer */
list ackl[2];
#define ACKL_DIRECT 0
#define ACKL_DELAY 1
timer *ackd_timer; /* Delayed ack timer */
timer *gr_timer; /* Graceful restart timer, non-NULL only if gr_active */
struct bfd_request *bfd_req; /* BFD request, if BFD is used */
void *ldd_buffer; /* Last database description packet */
u32 ldd_bsize; /* Buffer size for ldd_buffer */
u32 csn; /* OSPFv2: Last received crypt seq number */
u64 csn64[OSPF_PKT_TYPES]; /* OSPFv3: Last received CSN for each type of packet */
};
/* OSPF interface types */
#define OSPF_IT_BCAST 0
#define OSPF_IT_NBMA 1
#define OSPF_IT_PTP 2
#define OSPF_IT_PTMP 3
#define OSPF_IT_VLINK 4
#define OSPF_IT_UNDEF 5
/* OSPF interface states */
#define OSPF_IS_DOWN 0 /* Not active */
#define OSPF_IS_LOOP 1 /* Iface with no link */
#define OSPF_IS_WAITING 2 /* Waiting for Wait timer */
#define OSPF_IS_PTP 3 /* PTP operational */
#define OSPF_IS_DROTHER 4 /* I'm on BCAST or NBMA and I'm not DR */
#define OSPF_IS_BACKUP 5 /* I'm BDR */
#define OSPF_IS_DR 6 /* I'm DR */
/* Definitions for interface state machine */
#define ISM_UP 0 /* Interface Up */
#define ISM_WAITF 1 /* Wait timer fired */
#define ISM_BACKS 2 /* Backup seen */
#define ISM_NEICH 3 /* Neighbor change */
#define ISM_LOOP 4 /* Link down */
#define ISM_UNLOOP 5 /* Link up */
#define ISM_DOWN 6 /* Interface down */
/* OSPF authentication types */
#define OSPF_AUTH_NONE 0
#define OSPF_AUTH_SIMPLE 1
#define OSPF_AUTH_CRYPT 2
#define OSPF3_AUTH_HMAC 1 /* HMAC Cryptographic Authentication */
/* OSPF neighbor states */
#define NEIGHBOR_DOWN 0
#define NEIGHBOR_ATTEMPT 1
#define NEIGHBOR_INIT 2
#define NEIGHBOR_2WAY 3
#define NEIGHBOR_EXSTART 4
#define NEIGHBOR_EXCHANGE 5
#define NEIGHBOR_LOADING 6
#define NEIGHBOR_FULL 7
/* Definitions for neighbor state machine */
#define INM_HELLOREC 0 /* Hello Received */
#define INM_START 1 /* Neighbor start - for NBMA */
#define INM_2WAYREC 2 /* 2-Way received */
#define INM_NEGDONE 3 /* Negotiation done */
#define INM_EXDONE 4 /* Exchange done */
#define INM_BADLSREQ 5 /* Bad LS Request */
#define INM_LOADDONE 6 /* Load done */
#define INM_ADJOK 7 /* AdjOK? */
#define INM_SEQMIS 8 /* Sequence number mismatch */
#define INM_1WAYREC 9 /* 1-Way */
#define INM_KILLNBR 10 /* Kill Neighbor */
#define INM_INACTTIM 11 /* Inactivity timer */
#define INM_LLDOWN 12 /* Line down */
#define TRANS_OFF 0
#define TRANS_ON 1
#define TRANS_WAIT 2 /* Waiting before the end of translation */
/* Generic option flags */
#define OPT_V6 0x0001 /* OSPFv3, LSA relevant for IPv6 routing calculation */
#define OPT_E 0x0002 /* Related to AS-external LSAs */
#define OPT_MC 0x0004 /* Related to MOSPF, not used and obsolete */
#define OPT_N 0x0008 /* Related to NSSA */
#define OPT_P 0x0008 /* OSPFv2, flags P and N share position, see NSSA RFC */
#define OPT_L_V2 0x0010 /* OSPFv2, link-local signaling, not used */
#define OPT_R 0x0010 /* OSPFv3, originator is active router */
#define OPT_DC 0x0020 /* Related to demand circuits, not used */
#define OPT_O 0x0040 /* OSPFv2 Opaque LSA (RFC 5250) */
#define OPT_DN 0x0080 /* OSPFv2 VPN loop prevention (RFC 4576) */
#define OPT_AF 0x0100 /* OSPFv3 Address Families (RFC 5838) */
#define OPT_L_V3 0x0200 /* OSPFv3, link-local signaling */
#define OPT_AT 0x0400 /* OSPFv3, authentication trailer */
#define HELLO2_OPT_MASK (OPT_E | OPT_N | OPT_L_V2)
#define DBDES2_OPT_MASK (OPT_E | OPT_L_V2 | OPT_O)
#define HELLO3_OPT_MASK (OPT_V6 | OPT_E | OPT_N | OPT_R | OPT_AF | OPT_L_V3 | OPT_AT )
#define DBDES3_OPT_MASK (OPT_V6 | OPT_E | OPT_R | OPT_AF | OPT_L_V3 | OPT_AT )
/* Router-LSA VEB flags are are stored together with links (OSPFv2) or options (OSPFv3) */
#define OPT_RT_B (0x01 << 24)
#define OPT_RT_E (0x02 << 24)
#define OPT_RT_V (0x04 << 24)
#define OPT_RT_NT (0x10 << 24)
/* Prefix flags, specific for OSPFv3 */
#define OPT_PX_NU 0x01
#define OPT_PX_LA 0x02
#define OPT_PX_P 0x08
#define OPT_PX_DN 0x10
struct ospf_packet
{
u8 version;
u8 type;
u16 length;
u32 routerid;
u32 areaid;
u16 checksum;
u8 instance_id; /* See RFC 6549 */
u8 autype; /* Undefined for OSPFv3 */
};
struct ospf_lls
{
u16 checksum;
u16 length;
byte data[0];
};
struct ospf_auth_crypto
{
u16 zero;
u8 keyid;
u8 len;
u32 csn; /* Cryptographic sequence number (32-bit) */
};
union ospf_auth2
{
u8 password[8];
struct ospf_auth_crypto c32;
};
struct ospf_auth3
{
u16 type; /* Authentication type (OSPF3_AUTH_*) */
u16 length; /* Authentication trailer length (header + data) */
u16 reserved;
u16 sa_id; /* Security association identifier (key_id) */
u64 csn; /* Cryptographic sequence number (64-bit) */
byte data[0]; /* Authentication data */
};
/* Packet types */
#define HELLO_P 1 /* Hello */
#define DBDES_P 2 /* Database description */
#define LSREQ_P 3 /* Link state request */
#define LSUPD_P 4 /* Link state update */
#define LSACK_P 5 /* Link state acknowledgement */
#define DBDES_I 4 /* Init bit */
#define DBDES_M 2 /* More bit */
#define DBDES_MS 1 /* Master/Slave bit */
#define DBDES_IMMS (DBDES_I | DBDES_M | DBDES_MS)
/* OSPFv3 LSA Types / LSA Function Codes */
/* https://www.iana.org/assignments/ospfv3-parameters/ospfv3-parameters.xhtml#ospfv3-parameters-3 */
#define LSA_T_RT 0x2001
#define LSA_T_NET 0x2002
#define LSA_T_SUM_NET 0x2003
#define LSA_T_SUM_RT 0x2004
#define LSA_T_EXT 0x4005
#define LSA_T_NSSA 0x2007
#define LSA_T_LINK 0x0008
#define LSA_T_PREFIX 0x2009
#define LSA_T_GR 0x000B
#define LSA_T_RI_ 0x000C
#define LSA_T_RI_LINK 0x800C
#define LSA_T_RI_AREA 0xA00C
#define LSA_T_RI_AS 0xC00C
#define LSA_T_OPAQUE_ 0x1FFF
#define LSA_T_OPAQUE_LINK 0x9FFF
#define LSA_T_OPAQUE_AREA 0xBFFF
#define LSA_T_OPAQUE_AS 0xDFFF
#define LSA_T_V2_OPAQUE_ 0x0009
#define LSA_T_V2_MASK 0x00ff
/* OSPFv2 Opaque LSA Types */
/* https://www.iana.org/assignments/ospf-opaque-types/ospf-opaque-types.xhtml#ospf-opaque-types-2 */
#define LSA_OT_GR 0x03
#define LSA_OT_RI 0x04
#define LSA_FUNCTION_MASK 0x1FFF
#define LSA_FUNCTION(type) ((type) & LSA_FUNCTION_MASK)
#define LSA_UBIT 0x8000
#define LSA_SCOPE_LINK 0x0000
#define LSA_SCOPE_AREA 0x2000
#define LSA_SCOPE_AS 0x4000
#define LSA_SCOPE_RES 0x6000
#define LSA_SCOPE_MASK 0x6000
#define LSA_SCOPE(type) ((type) & LSA_SCOPE_MASK)
#define LSA_SCOPE_ORDER(type) (((type) >> 13) & 0x3)
#define LSA_MAXAGE 3600 /* 1 hour */
#define LSA_CHECKAGE 300 /* 5 minutes */
#define LSA_MAXAGEDIFF 900 /* 15 minutes */
#define LSA_ZEROSEQNO ((s32) 0x80000000)
#define LSA_INITSEQNO ((s32) 0x80000001)
#define LSA_MAXSEQNO ((s32) 0x7fffffff)
#define LSA_METRIC_MASK 0x00FFFFFF
#define LSA_OPTIONS_MASK 0x00FFFFFF
#define LSART_PTP 1
#define LSART_NET 2
#define LSART_STUB 3
#define LSART_VLNK 4
#define LSA_RT2_LINKS 0x0000FFFF
#define LSA_SUM2_TOS 0xFF000000
#define LSA_EXT2_TOS 0x7F000000
#define LSA_EXT2_EBIT 0x80000000
#define LSA_EXT3_EBIT 0x04000000
#define LSA_EXT3_FBIT 0x02000000
#define LSA_EXT3_TBIT 0x01000000
/* OSPF Grace LSA (GR) TLVs */
/* https://www.iana.org/assignments/ospfv2-parameters/ospfv2-parameters.xhtml#ospfv2-parameters-13 */
#define LSA_GR_PERIOD 1
#define LSA_GR_REASON 2
#define LSA_GR_ADDRESS 3
/* OSPF Router Information (RI) TLVs */
/* https://www.iana.org/assignments/ospf-parameters/ospf-parameters.xhtml#ri-tlv */
#define LSA_RI_RIC 1
#define LSA_RI_RFC 2
/* OSPF Router Informational Capability Bits */
/* https://www.iana.org/assignments/ospf-parameters/ospf-parameters.xhtml#router-informational-capability */
#define LSA_RIC_GR_CAPABLE 0
#define LSA_RIC_GR_HELPER 1
#define LSA_RIC_STUB_ROUTER 2
struct ospf_lsa_header
{
u16 age; /* LS Age */
u16 type_raw; /* Type, mixed with options on OSPFv2 */
u32 id;
u32 rt; /* Advertising router */
s32 sn; /* LS Sequence number */
u16 checksum;
u16 length;
};
/* In OSPFv2, options are embedded in higher half of type_raw */
static inline u8 lsa_get_options(struct ospf_lsa_header *lsa)
{ return lsa->type_raw >> 8; }
static inline void lsa_set_options(struct ospf_lsa_header *lsa, u16 options)
{ lsa->type_raw = (lsa->type_raw & 0xff) | (options << 8); }
struct ospf_lsa_rt
{
u32 options; /* VEB flags, mixed with link count for OSPFv2 and options for OSPFv3 */
};
struct ospf_lsa_rt2_link
{
u32 id;
u32 data;
#ifdef CPU_BIG_ENDIAN
u8 type;
u8 no_tos;
u16 metric;
#else
u16 metric;
u8 no_tos;
u8 type;
#endif
};
struct ospf_lsa_rt2_tos
{
#ifdef CPU_BIG_ENDIAN
u8 tos;
u8 padding;
u16 metric;
#else
u16 metric;
u8 padding;
u8 tos;
#endif
};
struct ospf_lsa_rt3_link
{
#ifdef CPU_BIG_ENDIAN
u8 type;
u8 padding;
u16 metric;
#else
u16 metric;
u8 padding;
u8 type;
#endif
u32 lif; /* Local interface ID */
u32 nif; /* Neighbor interface ID */
u32 id; /* Neighbor router ID */
};
struct ospf_lsa_net
{
u32 optx; /* Netmask for OSPFv2, options for OSPFv3 */
u32 routers[];
};
struct ospf_lsa_sum2
{
u32 netmask;
u32 metric;
};
struct ospf_lsa_sum3_net
{
u32 metric;
u32 prefix[];
};
struct ospf_lsa_sum3_rt
{
u32 options;
u32 metric;
u32 drid;
};
struct ospf_lsa_ext2
{
u32 netmask;
u32 metric;
u32 fwaddr;
u32 tag;
};
struct ospf_lsa_ext3
{
u32 metric;
u32 rest[];
};
struct ospf_lsa_ext_local
{
net_addr net;
ip_addr fwaddr;
u32 metric, ebit, fbit, tag, propagate, downwards;
u8 pxopts;
};
struct ospf_lsa_link
{
u32 options;
ip6_addr lladdr;
u32 pxcount;
u32 rest[];
};
struct ospf_lsa_prefix
{
#ifdef CPU_BIG_ENDIAN
u16 pxcount;
u16 ref_type;
#else
u16 ref_type;
u16 pxcount;
#endif
u32 ref_id;
u32 ref_rt;
u32 rest[];
};
struct ospf_tlv
{
#ifdef CPU_BIG_ENDIAN
u16 type;
u16 length;
#else
u16 length;
u16 type;
#endif
u32 data[];
};
static inline uint
lsa_net_count(struct ospf_lsa_header *lsa)
{
return (lsa->length - sizeof(struct ospf_lsa_header) - sizeof(struct ospf_lsa_net))
/ sizeof(u32);
}
/* In ospf_area->rtr we store paths to routers, but we use RID (and not IP address)
as index, so we need to encapsulate RID to IP address */
#define net_from_rid(x) NET_ADDR_IP4(ip4_from_u32(x), IP4_MAX_PREFIX_LENGTH)
#define rid_from_net(x) ip4_to_u32(((net_addr_ip4 *) x)->prefix)
#define IPV6_PREFIX_SPACE(x) ((((x) + 63) / 32) * 4)
#define IPV6_PREFIX_WORDS(x) (((x) + 63) / 32)
static inline int
ospf_valid_prefix(net_addr *n)
{
/*
* In OSPFv2, prefix is stored as netmask; ip4_masklen() returns 255 for
* invalid one. But OSPFv3-AF may receive IPv4 net with 32 < pxlen < 128.
*/
uint max = (n->type == NET_IP4) ? IP4_MAX_PREFIX_LENGTH : IP6_MAX_PREFIX_LENGTH;
return n->pxlen <= max;
}
/*
* In OSPFv3-AF (RFC 5835), IPv4 address is encoded by just placing it in the
* first 32 bits of IPv6 address and setting remaining bits to zero. Likewise
* for IPv4 prefix, where remaining bits do not matter. We use following
* functions to convert between IPv4 and IPv4-in-IPv6 representations:
*/
static inline ip4_addr ospf3_6to4(ip6_addr a)
{ return _MI4(_I0(a)); }
static inline ip6_addr ospf3_4to6(ip4_addr a)
{ return _MI6(_I(a), 0, 0, 0); }
static inline u32 *
ospf3_get_prefix(u32 *buf, int af, net_addr *n, u8 *pxopts, u16 *rest)
{
ip6_addr px = IP6_NONE;
uint pxlen = (*buf >> 24);
*pxopts = (*buf >> 16) & 0xff;
if (rest) *rest = *buf & 0xffff;
buf++;
if (pxlen > 0)
_I0(px) = *buf++;
if (pxlen > 32)
_I1(px) = *buf++;
if (pxlen > 64)
_I2(px) = *buf++;
if (pxlen > 96)
_I3(px) = *buf++;
/* Clean up remaining bits */
if (pxlen < 128)
px.addr[pxlen / 32] &= u32_mkmask(pxlen % 32);
if (af == NET_IP4)
net_fill_ip4(n, ospf3_6to4(px), pxlen);
else
net_fill_ip6(n, px, pxlen);
return buf;
}
static inline u32 *
ospf3_put_prefix(u32 *buf, net_addr *n, u8 pxopts, u16 rest)
{
ip6_addr px = (n->type == NET_IP4) ? ospf3_4to6(net4_prefix(n)) : net6_prefix(n);
uint pxlen = n->pxlen;
*buf++ = ((pxlen << 24) | (pxopts << 16) | rest);
if (pxlen > 0)
*buf++ = _I0(px);
if (pxlen > 32)
*buf++ = _I1(px);
if (pxlen > 64)
*buf++ = _I2(px);
if (pxlen > 96)
*buf++ = _I3(px);
return buf;
}
static inline u32 *
ospf3_get_addr(u32 *buf, int af, ip_addr *addr)
{
ip6_addr a;
memcpy(&a, buf, 16);
*addr = (af == NET_IP4) ? ipa_from_ip4(ospf3_6to4(a)) : ipa_from_ip6(a);
return buf + 4;
}
static inline u32 *
ospf3_put_addr(u32 *buf, ip_addr addr)
{
ip6_addr a = ipa_is_ip4(addr) ? ospf3_4to6(ipa_to_ip4(addr)) : ipa_to_ip6(addr);
memcpy(buf, &a, 16);
return buf + 4;
}
struct ospf_lsreq_header
{
u32 type;
u32 id;
u32 rt;
};
#define SH_ROUTER_SELF 0xffffffff
struct lsadb_show_data {
struct ospf_proto *proto; /* Protocol to request data from */
u16 type; /* LSA Type, 0 -> all */
u16 scope; /* Scope, 0 -> all, hack to handle link scope as 1 */
u32 area; /* Specified for area scope */
u32 lsid; /* LSA ID, 0 -> all */
u32 router; /* Advertising router, 0 -> all */
};
#define EA_OSPF_METRIC1 EA_CODE(PROTOCOL_OSPF, 0)
#define EA_OSPF_METRIC2 EA_CODE(PROTOCOL_OSPF, 1)
#define EA_OSPF_TAG EA_CODE(PROTOCOL_OSPF, 2)
#define EA_OSPF_ROUTER_ID EA_CODE(PROTOCOL_OSPF, 3)
/* ospf.c */
void ospf_schedule_rtcalc(struct ospf_proto *p);
static inline void ospf_notify_rt_lsa(struct ospf_area *oa)
{ oa->update_rt_lsa = 1; }
static inline void ospf_notify_net_lsa(struct ospf_iface *ifa)
{ ifa->update_net_lsa = 1; }
static inline void ospf_notify_link_lsa(struct ospf_iface *ifa)
{ ifa->update_link_lsa = 1; }
static inline int ospf_is_v2(struct ospf_proto *p)
{ return p->ospf2; }
static inline int ospf_is_v3(struct ospf_proto *p)
{ return ! p->ospf2; }
static inline int ospf_get_version(struct ospf_proto *p)
{ return ospf_is_v2(p) ? 2 : 3; }
static inline int ospf_is_ip4(struct ospf_proto *p)
{ return p->p.net_type == NET_IP4; }
static inline int ospf_is_ip6(struct ospf_proto *p)
{ return p->p.net_type == NET_IP6; }
static inline int ospf_get_af(struct ospf_proto *p)
{ return p->p.net_type; }
struct ospf_area *ospf_find_area(struct ospf_proto *p, u32 aid);
static inline struct ospf_area *ospf_main_area(struct ospf_proto *p)
{ return (p->areano == 1) ? HEAD(p->area_list) : p->backbone; }
static inline int oa_is_stub(struct ospf_area *oa)
{ return (oa->options & (OPT_E | OPT_N)) == 0; }
static inline int oa_is_ext(struct ospf_area *oa)
{ return oa->options & OPT_E; }
static inline int oa_is_nssa(struct ospf_area *oa)
{ return oa->options & OPT_N; }
void ospf_stop_gr_recovery(struct ospf_proto *p);
void ospf_sh_neigh(struct proto *P, const char *iff);
void ospf_sh(struct proto *P);
void ospf_sh_iface(struct proto *P, const char *iff);
void ospf_sh_state(struct proto *P, int verbose, int reachable);
void ospf_sh_lsadb(struct lsadb_show_data *ld);
/* iface.c */
void ospf_iface_chstate(struct ospf_iface *ifa, u8 state);
void ospf_iface_sm(struct ospf_iface *ifa, int event);
struct ospf_iface *ospf_iface_find(struct ospf_proto *p, struct iface *what);
void ospf_if_notify(struct proto *P, uint flags, struct iface *iface);
void ospf_ifa_notify2(struct proto *P, uint flags, struct ifa *a);
void ospf_ifa_notify3(struct proto *P, uint flags, struct ifa *a);
void ospf_iface_info(struct ospf_iface *ifa);
void ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *ip);
void ospf_iface_new_vlink(struct ospf_proto *p, struct ospf_iface_patt *ip);
void ospf_iface_remove(struct ospf_iface *ifa);
void ospf_iface_shutdown(struct ospf_iface *ifa);
int ospf_iface_assure_bufsize(struct ospf_iface *ifa, uint plen);
int ospf_iface_reconfigure(struct ospf_iface *ifa, struct ospf_iface_patt *new);
void ospf_reconfigure_ifaces(struct ospf_proto *p);
void ospf_open_vlink_sk(struct ospf_proto *p);
struct nbma_node *find_nbma_node_(list *nnl, ip_addr ip);
static inline struct nbma_node * find_nbma_node(struct ospf_iface *ifa, ip_addr ip)
{ return find_nbma_node_(&ifa->nbma_list, ip); }
static inline u32 ospf_iface_get_data(struct ospf_iface *ifa)
{
/*
* Return expected value of the link data field in Rt-LSA for given iface.
* It should be ifa->iface_id for unnumbered PtP links, IP address otherwise
* (see RFC 2328 12.4.1.1). It is controlled by ifa->ptp_address field so it
* can be overriden for compatibility purposes.
*/
return ((ifa->type == OSPF_IT_PTP) && !ifa->ptp_address) ?
ifa->iface_id :
ipa_to_u32(ifa->addr->ip);
}
/* neighbor.c */
struct ospf_neighbor *ospf_neighbor_new(struct ospf_iface *ifa);
void ospf_neigh_sm(struct ospf_neighbor *n, int event);
void ospf_neigh_cancel_graceful_restart(struct ospf_neighbor *n);
void ospf_neigh_notify_grace_lsa(struct ospf_neighbor *n, struct top_hash_entry *en);
void ospf_neigh_lsadb_changed_(struct ospf_proto *p, struct top_hash_entry *en);
void ospf_dr_election(struct ospf_iface *ifa);
struct ospf_neighbor *find_neigh(struct ospf_iface *ifa, u32 rid);
struct ospf_neighbor *find_neigh_by_ip(struct ospf_iface *ifa, ip_addr ip);
void ospf_neigh_update_bfd(struct ospf_neighbor *n, int use_bfd);
void ospf_sh_neigh_info(struct ospf_neighbor *n);
static inline void ospf_neigh_lsadb_changed(struct ospf_proto *p, struct top_hash_entry *en)
{ if (p->gr_count) ospf_neigh_lsadb_changed_(p, en); }
/* packet.c */
void ospf_pkt_fill_hdr(struct ospf_iface *ifa, void *buf, u8 h_type);
int ospf_rx_hook(sock * sk, uint size);
// void ospf_tx_hook(sock * sk);
void ospf_err_hook(sock * sk, int err);
void ospf_verr_hook(sock *sk, int err);
void ospf_send_to(struct ospf_iface *ifa, ip_addr ip);
void ospf_send_to_iface(struct ospf_iface *ifa);
static inline void ospf_send_to_nbr(struct ospf_iface *ifa, struct ospf_neighbor *n)
{ ospf_send_to(ifa, (ifa->type == OSPF_IT_PTP) ? ifa->all_routers : n->ip); }
static inline void ospf_send_to_all(struct ospf_iface *ifa)
{ ospf_send_to(ifa, ifa->all_routers); }
static inline uint ospf_pkt_maxsize(struct ospf_iface *ifa)
{ return ifa->tx_length - ifa->tx_hdrlen; }
#ifndef PARSER
#define DROP(DSC,VAL) do { err_dsc = DSC; err_val = VAL; goto drop; } while(0)
#define DROP1(DSC) do { err_dsc = DSC; goto drop; } while(0)
#define SKIP(DSC) do { err_dsc = DSC; goto skip; } while(0)
#endif
static inline uint ospf_pkt_hdrlen(struct ospf_proto *p)
{ return ospf_is_v2(p) ? (sizeof(struct ospf_packet) + sizeof(union ospf_auth2)) : sizeof(struct ospf_packet); }
static inline void * ospf_tx_buffer(struct ospf_iface *ifa)
{ return ifa->sk->tbuf; }
/* hello.c */
#define OHS_HELLO 0
#define OHS_POLL 1
#define OHS_SHUTDOWN 2
void ospf_send_hello(struct ospf_iface *ifa, int kind, struct ospf_neighbor *dirn);
void ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n, ip_addr faddr);
uint ospf_hello3_options(struct ospf_packet *pkt);
/* dbdes.c */
void ospf_send_dbdes(struct ospf_proto *p, struct ospf_neighbor *n);
void ospf_rxmt_dbdes(struct ospf_proto *p, struct ospf_neighbor *n);
void ospf_reset_ldd(struct ospf_proto *p, struct ospf_neighbor *n);
void ospf_receive_dbdes(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n);
uint ospf_dbdes3_options(struct ospf_packet *pkt);
/* lsreq.c */
void ospf_send_lsreq(struct ospf_proto *p, struct ospf_neighbor *n);
void ospf_receive_lsreq(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n);
/* lsupd.c */
void ospf_dump_lsahdr(struct ospf_proto *p, struct ospf_lsa_header *lsa_n);
void ospf_dump_common(struct ospf_proto *p, struct ospf_packet *pkt);
void ospf_lsa_lsrt_down_(struct top_hash_entry *en, struct ospf_neighbor *n, struct top_hash_entry *ret);
void ospf_add_flushed_to_lsrt(struct ospf_proto *p, struct ospf_neighbor *n);
void ospf_flood_event(void *ptr);
int ospf_flood_lsa(struct ospf_proto *p, struct top_hash_entry *en, struct ospf_neighbor *from);
int ospf_send_lsupd(struct ospf_proto *p, struct top_hash_entry **lsa_list, uint lsa_count, struct ospf_neighbor *n);
void ospf_rxmt_lsupd(struct ospf_proto *p, struct ospf_neighbor *n);
void ospf_receive_lsupd(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n);
/* lsack.c */
void ospf_enqueue_lsack(struct ospf_neighbor *n, struct ospf_lsa_header *h_n, int queue);
void ospf_reset_lsack_queue(struct ospf_neighbor *n);
void ospf_send_lsack(struct ospf_proto *p, struct ospf_neighbor *n, int queue);
void ospf_receive_lsack(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n);
#include "proto/ospf/rt.h"
#include "proto/ospf/topology.h"
#include "proto/ospf/lsalib.h"
#endif /* _BIRD_OSPF_H_ */
View Git Blame Copy Permalink