Annotation of embedaddon/bird2/proto/rip/rip.h, revision 1.1
1.1 ! misho 1: /*
! 2: * BIRD -- Routing Information Protocol (RIP)
! 3: *
! 4: * (c) 1998--1999 Pavel Machek <pavel@ucw.cz>
! 5: * (c) 2004--2013 Ondrej Filip <feela@network.cz>
! 6: * (c) 2009--2015 Ondrej Zajicek <santiago@crfreenet.org>
! 7: * (c) 2009--2015 CZ.NIC z.s.p.o.
! 8: *
! 9: * Can be freely distributed and used under the terms of the GNU GPL.
! 10: */
! 11:
! 12: #ifndef _BIRD_RIP_H_
! 13: #define _BIRD_RIP_H_
! 14:
! 15: #include "nest/bird.h"
! 16: #include "nest/cli.h"
! 17: #include "nest/iface.h"
! 18: #include "nest/protocol.h"
! 19: #include "nest/route.h"
! 20: #include "nest/password.h"
! 21: #include "nest/locks.h"
! 22: #include "nest/bfd.h"
! 23: #include "lib/lists.h"
! 24: #include "lib/resource.h"
! 25: #include "lib/socket.h"
! 26: #include "lib/string.h"
! 27: #include "lib/timer.h"
! 28:
! 29:
! 30: #define RIP_V1 1
! 31: #define RIP_V2 2
! 32:
! 33: #define RIP_PORT 520 /* RIP for IPv4 */
! 34: #define RIP_NG_PORT 521 /* RIPng */
! 35:
! 36: #define RIP_MAX_PKT_LENGTH 532 /* 512 + IP4_HEADER_LENGTH */
! 37: #define RIP_AUTH_TAIL_LENGTH 4 /* Without auth_data */
! 38:
! 39: #define RIP_DEFAULT_ECMP_LIMIT 16
! 40: #define RIP_DEFAULT_INFINITY 16
! 41: #define RIP_DEFAULT_UPDATE_TIME (30 S_)
! 42: #define RIP_DEFAULT_TIMEOUT_TIME (180 S_)
! 43: #define RIP_DEFAULT_GARBAGE_TIME (120 S_)
! 44:
! 45:
! 46: struct rip_config
! 47: {
! 48: struct proto_config c;
! 49: list patt_list; /* List of iface configs (struct rip_iface_config) */
! 50:
! 51: u8 rip2; /* RIPv2 (IPv4) or RIPng (IPv6) */
! 52: u8 ecmp; /* Maximum number of nexthops in ECMP route, or 0 */
! 53: u8 infinity; /* Maximum metric value, representing infinity */
! 54:
! 55: btime min_timeout_time; /* Minimum of interface timeout_time */
! 56: btime max_garbage_time; /* Maximum of interface garbage_time */
! 57: };
! 58:
! 59: struct rip_iface_config
! 60: {
! 61: struct iface_patt i;
! 62: ip_addr address; /* Configured dst address */
! 63: u16 port; /* Src+dst port */
! 64: u8 metric; /* Incoming metric */
! 65: u8 mode; /* Interface mode (RIP_IM_*) */
! 66: u8 passive; /* Passive iface - no packets are sent */
! 67: u8 version; /* RIP version used for outgoing packets */
! 68: u8 version_only; /* FIXXX */
! 69: u8 split_horizon; /* Split horizon is used in route updates */
! 70: u8 poison_reverse; /* Poisoned reverse is used in route updates */
! 71: u8 check_zero; /* Validation of RIPv1 reserved fields */
! 72: u8 ecmp_weight; /* Weight for ECMP routes*/
! 73: u8 auth_type; /* Authentication type (RIP_AUTH_*) */
! 74: u8 ttl_security; /* bool + 2 for TX only (send, but do not check on RX) */
! 75: u8 check_link; /* Whether iface link change is used */
! 76: u8 bfd; /* Use BFD on iface */
! 77: u16 rx_buffer; /* RX buffer size, 0 for MTU */
! 78: u16 tx_length; /* TX packet length limit (including headers), 0 for MTU */
! 79: int tx_tos;
! 80: int tx_priority;
! 81: btime update_time; /* Periodic update interval */
! 82: btime timeout_time; /* Route expiration timeout */
! 83: btime garbage_time; /* Unreachable entry GC timeout */
! 84: list *passwords; /* Passwords for authentication */
! 85: };
! 86:
! 87: struct rip_proto
! 88: {
! 89: struct proto p;
! 90: struct fib rtable; /* Internal routing table */
! 91: list iface_list; /* List of interfaces (struct rip_iface) */
! 92: slab *rte_slab; /* Slab for internal routes (struct rip_rte) */
! 93: timer *timer; /* Main protocol timer */
! 94:
! 95: u8 rip2; /* RIPv2 (IPv4) or RIPng (IPv6) */
! 96: u8 ecmp; /* Maximum number of nexthops in ECMP route, or 0 */
! 97: u8 infinity; /* Maximum metric value, representing infinity */
! 98: u8 triggered; /* Logical AND of interface want_triggered values */
! 99: u8 rt_reload; /* Route reload is scheduled */
! 100:
! 101: struct tbf log_pkt_tbf; /* TBF for packet messages */
! 102: struct tbf log_rte_tbf; /* TBF for RTE messages */
! 103: };
! 104:
! 105: struct rip_iface
! 106: {
! 107: node n;
! 108: struct rip_proto *rip;
! 109: struct iface *iface; /* Underyling core interface */
! 110: struct rip_iface_config *cf; /* Related config, must be updated in reconfigure */
! 111: struct object_lock *lock; /* Interface lock */
! 112: timer *timer; /* Interface timer */
! 113: sock *sk; /* UDP socket */
! 114:
! 115: u8 up; /* Interface is active */
! 116: u8 csn_ready; /* Nonzero CSN can be used */
! 117: u16 tx_plen; /* Max TX packet data length */
! 118: u32 csn; /* Last used crypto sequence number */
! 119: ip_addr addr; /* Destination multicast/broadcast address */
! 120: list neigh_list; /* List of iface neighbors (struct rip_neighbor) */
! 121:
! 122: /* Update scheduling */
! 123: btime next_regular; /* Next time when regular update should be called */
! 124: btime next_triggered; /* Next time when triggerd update may be called */
! 125: btime want_triggered; /* Nonzero if triggered update is scheduled */
! 126:
! 127: /* Active update */
! 128: int tx_active; /* Update session is active */
! 129: ip_addr tx_addr; /* Update session destination address */
! 130: btime tx_changed; /* Minimal changed time for triggered update */
! 131: struct fib_iterator tx_fit; /* FIB iterator in RIP routing table (p.rtable) */
! 132: };
! 133:
! 134: struct rip_neighbor
! 135: {
! 136: node n;
! 137: struct rip_iface *ifa; /* Associated interface, may be NULL if stale */
! 138: struct neighbor *nbr; /* Associaded core neighbor, may be NULL if stale */
! 139: struct bfd_request *bfd_req; /* BFD request, if BFD is used */
! 140: btime last_seen; /* Time of last received and accepted message */
! 141: u32 uc; /* Use count, number of routes linking the neighbor */
! 142: u32 csn; /* Last received crypto sequence number */
! 143: };
! 144:
! 145: struct rip_entry
! 146: {
! 147: struct rip_rte *routes; /* List of incoming routes */
! 148:
! 149: u8 valid; /* Entry validity state (RIP_ENTRY_*) */
! 150: u8 metric; /* Outgoing route metric */
! 151: u16 tag; /* Outgoing route tag */
! 152: struct iface *from; /* Outgoing route from, NULL if from proto */
! 153: struct iface *iface; /* Outgoing route iface (for next hop) */
! 154: ip_addr next_hop; /* Outgoing route next hop */
! 155:
! 156: btime changed; /* Last time when the outgoing route metric changed */
! 157:
! 158: struct fib_node n;
! 159: };
! 160:
! 161: struct rip_rte
! 162: {
! 163: struct rip_rte *next;
! 164:
! 165: struct rip_neighbor *from; /* Advertising router */
! 166: ip_addr next_hop; /* Route next hop (iface is from->nbr->iface) */
! 167: u16 metric; /* Route metric (after increase) */
! 168: u16 tag; /* Route tag */
! 169:
! 170: btime expires; /* Time of route expiration */
! 171: };
! 172:
! 173:
! 174: #define RIP_AUTH_NONE 0
! 175: #define RIP_AUTH_PLAIN 2
! 176: #define RIP_AUTH_CRYPTO 3
! 177:
! 178: #define RIP_IM_MULTICAST 1
! 179: #define RIP_IM_BROADCAST 2
! 180:
! 181: #define RIP_ENTRY_DUMMY 0 /* Only used to store list of incoming routes */
! 182: #define RIP_ENTRY_VALID 1 /* Valid outgoing route */
! 183: #define RIP_ENTRY_STALE 2 /* Stale outgoing route, waiting for GC */
! 184:
! 185: #define EA_RIP_METRIC EA_CODE(PROTOCOL_RIP, 0)
! 186: #define EA_RIP_TAG EA_CODE(PROTOCOL_RIP, 1)
! 187:
! 188: static inline int rip_is_v2(struct rip_proto *p)
! 189: { return p->rip2; }
! 190:
! 191: static inline int rip_is_ng(struct rip_proto *p)
! 192: { return ! p->rip2; }
! 193:
! 194: static inline void
! 195: rip_reset_tx_session(struct rip_proto *p, struct rip_iface *ifa)
! 196: {
! 197: if (ifa->tx_active)
! 198: {
! 199: FIB_ITERATE_UNLINK(&ifa->tx_fit, &p->rtable);
! 200: ifa->tx_active = 0;
! 201: }
! 202: }
! 203:
! 204: /* rip.c */
! 205: void rip_update_rte(struct rip_proto *p, net_addr *n, struct rip_rte *new);
! 206: void rip_withdraw_rte(struct rip_proto *p, net_addr *n, struct rip_neighbor *from);
! 207: struct rip_neighbor * rip_get_neighbor(struct rip_proto *p, ip_addr *a, struct rip_iface *ifa);
! 208: void rip_update_bfd(struct rip_proto *p, struct rip_neighbor *n);
! 209: void rip_show_interfaces(struct proto *P, char *iff);
! 210: void rip_show_neighbors(struct proto *P, char *iff);
! 211:
! 212: /* packets.c */
! 213: void rip_send_request(struct rip_proto *p, struct rip_iface *ifa);
! 214: void rip_send_table(struct rip_proto *p, struct rip_iface *ifa, ip_addr addr, btime changed);
! 215: int rip_open_socket(struct rip_iface *ifa);
! 216:
! 217:
! 218: #endif
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