X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/d4905790250059e6dd95082a1b3cc13b7c4a6c68..e7c9a1993778e9ac375d7f956dda7c3c802a83a5:/bgp.c?ds=sidebyside diff --git a/bgp.c b/bgp.c index b5d0440..36894be 100644 --- a/bgp.c +++ b/bgp.c @@ -10,8 +10,6 @@ * nor RFC2385 (which requires a kernel patch on 2.4 kernels). */ -char const *cvs_id_bgp = "$Id: bgp.c,v 1.3 2004-08-13 00:02:50 fred_nerk Exp $"; - #include #include #include @@ -22,6 +20,7 @@ char const *cvs_id_bgp = "$Id: bgp.c,v 1.3 2004-08-13 00:02:50 fred_nerk Exp $"; #include #include #include +#include #include "l2tpns.h" #include "bgp.h" @@ -29,13 +28,15 @@ char const *cvs_id_bgp = "$Id: bgp.c,v 1.3 2004-08-13 00:02:50 fred_nerk Exp $"; static void bgp_clear(struct bgp_peer *peer); static void bgp_set_retry(struct bgp_peer *peer); -static void bgp_cidr(in_addr_t ip, in_addr_t mask, struct bgp_ip_prefix *pfx); static struct bgp_route_list *bgp_insert_route(struct bgp_route_list *head, - struct bgp_route_list *new); + struct bgp_route_list *new); +static struct bgp_route6_list *bgp_insert_route6(struct bgp_route6_list *head, + struct bgp_route6_list *new); +static void bgp_process_timers(struct bgp_peer *peer); static void bgp_free_routes(struct bgp_route_list *routes); -static char const *bgp_state_str(enum bgp_state state); -static char const *bgp_msg_type_str(u8 type); +static void bgp_free_routes6(struct bgp_route6_list *routes); +static char const *bgp_msg_type_str(uint8_t type); static int bgp_connect(struct bgp_peer *peer); static int bgp_handle_connect(struct bgp_peer *peer); static int bgp_write(struct bgp_peer *peer); @@ -44,310 +45,405 @@ static int bgp_handle_input(struct bgp_peer *peer); static int bgp_send_open(struct bgp_peer *peer); static int bgp_send_keepalive(struct bgp_peer *peer); static int bgp_send_update(struct bgp_peer *peer); -static int bgp_send_notification(struct bgp_peer *peer, u8 code, u8 subcode); +static int bgp_send_update6(struct bgp_peer *peer); +static int bgp_send_notification(struct bgp_peer *peer, uint8_t code, + uint8_t subcode); + +static uint16_t our_as; +static struct bgp_route_list *bgp_routes = 0; +static struct bgp_route6_list *bgp_routes6 = 0; -static u16 our_as; +int bgp_configured = 0; +struct bgp_peer *bgp_peers = 0; /* prepare peer structure, globals */ int bgp_setup(int as) { - int i; - struct bgp_peer *peer; + int i; + struct bgp_peer *peer; - for (i = 0; i < BGP_NUM_PEERS; i++) - { - peer = &bgp_peers[i]; - memset(peer, 0, sizeof(*peer)); + for (i = 0; i < BGP_NUM_PEERS; i++) + { + peer = &bgp_peers[i]; + memset(peer, 0, sizeof(*peer)); - peer->addr = INADDR_NONE; - peer->sock = -1; - peer->state = peer->next_state = Disabled; + peer->addr = INADDR_NONE; + peer->sock = -1; + peer->state = peer->next_state = Disabled; - if (!((peer->outbuf = malloc(sizeof(*peer->outbuf))) && (peer->inbuf = malloc(sizeof(*peer->inbuf))))) - { - log(0, 0, 0, 0, "Can't allocate buffers for bgp peer (%s)\n", - strerror(errno)); + if (!((peer->outbuf = malloc(sizeof(*peer->outbuf))) + && (peer->inbuf = malloc(sizeof(*peer->inbuf))))) + { + LOG(0, 0, 0, "Can't allocate buffers for bgp peer (%s)\n", + strerror(errno)); - return 0; - } + return 0; } - if (as < 1) - as = 0; + peer->edata.type = FD_TYPE_BGP; + peer->edata.index = i; + peer->events = 0; + } - if ((our_as = as)) - return 0; + if (as < 1) + as = 0; - bgp_routes = 0; - bgp_configured = 0; /* set by bgp_start */ + if ((our_as = as)) + return 0; - return 1; + bgp_routes = 0; + bgp_routes6 = 0; + bgp_configured = 0; /* set by bgp_start */ + + return 1; } /* start connection with a peer */ -int bgp_start(struct bgp_peer *peer, char *name, int as, int enable) +int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive, + int hold, struct in_addr update_source, int enable) { - struct hostent *h; - int ibgp; - int i; - struct bgp_path_attr a; - char path_attrs[64]; - char *p = path_attrs; - in_addr_t ip; - u32 metric = htonl(BGP_METRIC); - u32 no_export = htonl(BGP_COMMUNITY_NO_EXPORT); - - if (!our_as) - return 0; - - if (peer->state != Disabled) - bgp_halt(peer); - - snprintf(peer->name, sizeof(peer->name), "%s", name); - - if (!(h = gethostbyname(name)) || h->h_addrtype != AF_INET) - { - log(0, 0, 0, 0, "Can't get address for BGP peer %s (%s)\n", name, h ? "no address" : hstrerror(h_errno)); - - return 0; - } - - memcpy(&peer->addr, h->h_addr, sizeof(peer->addr)); - peer->as = as > 0 ? as : our_as; - ibgp = peer->as == our_as; - - /* clear buffers, go to Idle state */ - peer->next_state = Idle; - bgp_clear(peer); - - /* set initial routing state */ - peer->routing = enable; - - /* all our routes use the same attributes, so prepare it in advance */ - if (peer->path_attrs) - free(peer->path_attrs); - - peer->path_attr_len = 0; - - /* ORIGIN */ - a.flags = BGP_PATH_ATTR_FLAG_TRANS; - a.code = BGP_PATH_ATTR_CODE_ORIGIN; - a.data.s.len = 1; - a.data.s.value[0] = BGP_PATH_ATTR_CODE_ORIGIN_IGP; - -#define ADD_ATTRIBUTE() do { \ - i = BGP_PATH_ATTR_SIZE(a); \ - memcpy(p, &a, i); \ - p += i; \ - peer->path_attr_len += i; } while (0) - - ADD_ATTRIBUTE(); - - /* AS_PATH */ + struct hostent *h; + int ibgp; + int i; + struct bgp_path_attr a; + char path_attrs[64]; + char *p = path_attrs; + in_addr_t ip; + uint32_t metric = htonl(BGP_METRIC); + uint32_t no_export = htonl(BGP_COMMUNITY_NO_EXPORT); + + if (!our_as) + return 0; + + if (peer->state != Disabled) + bgp_halt(peer); + + snprintf(peer->name, sizeof(peer->name), "%s", name); + + if (!(h = gethostbyname(name)) || h->h_addrtype != AF_INET) + { + LOG(0, 0, 0, "Can't get address for BGP peer %s (%s)\n", + name, h ? "no address" : hstrerror(h_errno)); + + return 0; + } + + memcpy(&peer->addr, h->h_addr, sizeof(peer->addr)); + peer->source_addr = update_source.s_addr; + peer->as = as > 0 ? as : our_as; + ibgp = peer->as == our_as; + + /* set initial timer values */ + peer->init_keepalive = keepalive == -1 ? BGP_KEEPALIVE_TIME : keepalive; + peer->init_hold = hold == -1 ? BGP_HOLD_TIME : hold; + + if (peer->init_hold < 3) + peer->init_hold = 3; + + if (peer->init_keepalive * 3 > peer->init_hold) + peer->init_keepalive = peer->init_hold / 3; + + /* clear buffers, go to Idle state */ + peer->next_state = Idle; + bgp_clear(peer); + + /* set initial routing state */ + peer->routing = enable; + + /* all our routes use the same attributes, so prepare it in advance */ + if (peer->path_attrs) + free(peer->path_attrs); + + peer->path_attr_len = 0; + + /* ORIGIN */ + a.flags = BGP_PATH_ATTR_FLAG_TRANS; + a.code = BGP_PATH_ATTR_CODE_ORIGIN; + a.data.s.len = 1; + a.data.s.value[0] = BGP_PATH_ATTR_CODE_ORIGIN_IGP; + +#define ADD_ATTRIBUTE() do { \ + i = BGP_PATH_ATTR_SIZE(a); \ + memcpy(p, &a, i); \ + p += i; \ + peer->path_attr_len += i; } while (0) + + ADD_ATTRIBUTE(); + + /* AS_PATH */ + a.flags = BGP_PATH_ATTR_FLAG_TRANS; + a.code = BGP_PATH_ATTR_CODE_AS_PATH; + if (ibgp) + { + /* empty path */ + a.data.s.len = 0; + } + else + { + /* just our AS */ + struct { + uint8_t type; + uint8_t len; + uint16_t value; + } as_path = { + BGP_PATH_ATTR_CODE_AS_PATH_AS_SEQUENCE, + 1, + htons(our_as), + }; + + a.data.s.len = sizeof(as_path); + memcpy(&a.data.s.value, &as_path, sizeof(as_path)); + } + + ADD_ATTRIBUTE(); + + /* MULTI_EXIT_DISC */ + a.flags = BGP_PATH_ATTR_FLAG_OPTIONAL; + a.code = BGP_PATH_ATTR_CODE_MULTI_EXIT_DISC; + a.data.s.len = sizeof(metric); + memcpy(a.data.s.value, &metric, sizeof(metric)); + + ADD_ATTRIBUTE(); + + if (ibgp) + { + uint32_t local_pref = htonl(BGP_LOCAL_PREF); + + /* LOCAL_PREF */ a.flags = BGP_PATH_ATTR_FLAG_TRANS; - a.code = BGP_PATH_ATTR_CODE_AS_PATH; - if (ibgp) - { - /* empty path */ - a.data.s.len = 0; - } - else - { - /* just our AS */ - struct { - u8 type; - u8 len; - u16 value; - } as_path = { - BGP_PATH_ATTR_CODE_AS_PATH_AS_SEQUENCE, - 1, - htons(our_as), - }; - - a.data.s.len = sizeof(as_path); - memcpy(&a.data.s.value, &as_path, sizeof(as_path)); - } + a.code = BGP_PATH_ATTR_CODE_LOCAL_PREF; + a.data.s.len = sizeof(local_pref); + memcpy(a.data.s.value, &local_pref, sizeof(local_pref)); ADD_ATTRIBUTE(); - - /* NEXT_HOP */ - a.flags = BGP_PATH_ATTR_FLAG_TRANS; - a.code = BGP_PATH_ATTR_CODE_NEXT_HOP; + } + + /* COMMUNITIES */ + a.flags = BGP_PATH_ATTR_FLAG_OPTIONAL | BGP_PATH_ATTR_FLAG_TRANS; + a.code = BGP_PATH_ATTR_CODE_COMMUNITIES; + a.data.s.len = sizeof(no_export); + memcpy(a.data.s.value, &no_export, sizeof(no_export)); + + ADD_ATTRIBUTE(); + + /* remember the len before adding NEXT_HOP */ + peer->path_attr_len_without_nexthop = peer->path_attr_len; + + /* NEXT_HOP */ + a.flags = BGP_PATH_ATTR_FLAG_TRANS; + a.code = BGP_PATH_ATTR_CODE_NEXT_HOP; + if (config->nexthop_address) + { + ip = config->nexthop_address; + } + else + { ip = my_address; /* we're it */ - a.data.s.len = sizeof(ip); - memcpy(a.data.s.value, &ip, sizeof(ip)); + } + a.data.s.len = sizeof(ip); + memcpy(a.data.s.value, &ip, sizeof(ip)); - ADD_ATTRIBUTE(); + ADD_ATTRIBUTE(); - /* MULTI_EXIT_DISC */ - a.flags = BGP_PATH_ATTR_FLAG_OPTIONAL; - a.code = BGP_PATH_ATTR_CODE_MULTI_EXIT_DISC; - a.data.s.len = sizeof(metric); - memcpy(a.data.s.value, &metric, sizeof(metric)); + if (!(peer->path_attrs = malloc(peer->path_attr_len))) + { + LOG(0, 0, 0, "Can't allocate path_attrs for %s (%s)\n", + name, strerror(errno)); - ADD_ATTRIBUTE(); + return 0; + } - if (ibgp) - { - u32 local_pref = htonl(BGP_LOCAL_PREF); + memcpy(peer->path_attrs, path_attrs, peer->path_attr_len); - /* LOCAL_PREF */ - a.flags = BGP_PATH_ATTR_FLAG_TRANS; - a.code = BGP_PATH_ATTR_CODE_LOCAL_PREF; - a.data.s.len = sizeof(local_pref); - memcpy(a.data.s.value, &local_pref, sizeof(local_pref)); + /* multiprotocol attributes initialization */ + if (config->ipv6_prefix.s6_addr[0]) + { + struct bgp_attr_mp_reach_nlri_partial mp_reach_nlri_partial; + struct bgp_attr_mp_unreach_nlri_partial mp_unreach_nlri_partial; - ADD_ATTRIBUTE(); + a.flags = BGP_PATH_ATTR_FLAG_OPTIONAL; + a.code = BGP_PATH_ATTR_CODE_MP_REACH_NLRI; + a.data.s.len = 0; /* will be set on UPDATE */ + + mp_reach_nlri_partial.afi = htons(BGP_MP_AFI_IPv6); + mp_reach_nlri_partial.safi = BGP_MP_SAFI_UNICAST; + mp_reach_nlri_partial.reserved = 0; + mp_reach_nlri_partial.next_hop_len = 16; + + /* use the defined nexthop6, or our address in ipv6_prefix */ + if (config->nexthop6_address.s6_addr[0]) + memcpy(&mp_reach_nlri_partial.next_hop, + &config->nexthop6_address.s6_addr, 16); + else + { + /* our address is ipv6prefix::1 */ + memcpy(&mp_reach_nlri_partial.next_hop, + &config->ipv6_prefix.s6_addr, 16); + mp_reach_nlri_partial.next_hop[15] = 1; } - /* COMMUNITIES */ - a.flags = BGP_PATH_ATTR_FLAG_OPTIONAL | BGP_PATH_ATTR_FLAG_TRANS; - a.code = BGP_PATH_ATTR_CODE_COMMUNITIES; - a.data.s.len = sizeof(no_export); - memcpy(a.data.s.value, &no_export, sizeof(no_export)); + memcpy(&a.data.s.value, &mp_reach_nlri_partial, + sizeof(struct bgp_attr_mp_reach_nlri_partial)); + memcpy(&peer->mp_reach_nlri_partial, &a, + BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE); - ADD_ATTRIBUTE(); + a.flags = BGP_PATH_ATTR_FLAG_OPTIONAL | BGP_PATH_ATTR_FLAG_EXTLEN; + a.code = BGP_PATH_ATTR_CODE_MP_UNREACH_NLRI; + a.data.e.len = 0; /* will be set on UPDATE */ - if (!(peer->path_attrs = malloc(peer->path_attr_len))) - { - log(0, 0, 0, 0, "Can't allocate path_attrs for %s (%s)\n", - name, strerror(errno)); + mp_unreach_nlri_partial.afi = htons(BGP_MP_AFI_IPv6); + mp_unreach_nlri_partial.safi = BGP_MP_SAFI_UNICAST; - return 0; - } + memcpy(&a.data.e.value, &mp_unreach_nlri_partial, + sizeof(struct bgp_attr_mp_unreach_nlri_partial)); + memcpy(&peer->mp_unreach_nlri_partial, &a, + BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE); + } - memcpy(peer->path_attrs, path_attrs, peer->path_attr_len); + peer->mp_handling = HandlingUnknown; - log(4, 0, 0, 0, "Initiating BGP connection to %s (routing %s)\n", - name, enable ? "enabled" : "suspended"); + LOG(4, 0, 0, "Initiating BGP connection to %s (routing %s)\n", + name, enable ? "enabled" : "suspended"); - /* we have at least one peer configured */ - bgp_configured = 1; + /* we have at least one peer configured */ + bgp_configured = 1; - /* connect */ - return bgp_connect(peer); + /* connect */ + return bgp_connect(peer); } /* clear counters, timers, routes and buffers; close socket; move to next_state, which may be Disabled or Idle */ static void bgp_clear(struct bgp_peer *peer) { - if (peer->sock != -1) - { - close(peer->sock); - peer->sock = -1; - } - - peer->keepalive_time = 0; - peer->hold = 0; - peer->expire_time = 0; - - bgp_free_routes(peer->routes); - peer->routes = 0; - - peer->outbuf->packet.header.len = 0; - peer->outbuf->done = 0; - peer->inbuf->packet.header.len = 0; - peer->inbuf->done = 0; - - peer->cli_flag = 0; - - if (peer->state != peer->next_state) - { - peer->state = peer->next_state; - peer->state_time = time_now; + if (peer->sock != -1) + { + close(peer->sock); + peer->sock = -1; + } + + peer->keepalive_time = 0; + peer->expire_time = 0; + + peer->keepalive = peer->init_keepalive; + peer->hold = peer->init_hold; + + bgp_free_routes(peer->routes); + peer->routes = 0; + bgp_free_routes6(peer->routes6); + peer->routes6 = 0; + + peer->outbuf->packet.header.len = 0; + peer->outbuf->done = 0; + peer->inbuf->packet.header.len = 0; + peer->inbuf->done = 0; + + peer->cli_flag = 0; + peer->events = 0; + + if (peer->state != peer->next_state) + { + peer->state = peer->next_state; + peer->state_time = time_now; - log(4, 0, 0, 0, "BGP peer %s: state %s\n", peer->name, - bgp_state_str(peer->next_state)); - } + LOG(4, 0, 0, "BGP peer %s: state %s\n", peer->name, + bgp_state_str(peer->next_state)); + } } /* initiate a clean shutdown */ void bgp_stop(struct bgp_peer *peer) { - log(4, 0, 0, 0, "Terminating BGP connection to %s\n", peer->name); - bgp_send_notification(peer, BGP_ERR_CEASE, 0); + LOG(4, 0, 0, "Terminating BGP connection to %s\n", peer->name); + bgp_send_notification(peer, BGP_ERR_CEASE, 0); } /* drop connection (if any) and set state to Disabled */ void bgp_halt(struct bgp_peer *peer) { - log(4, 0, 0, 0, "Aborting BGP connection to %s\n", peer->name); - peer->next_state = Disabled; - bgp_clear(peer); + LOG(4, 0, 0, "Aborting BGP connection to %s\n", peer->name); + peer->next_state = Disabled; + bgp_clear(peer); } /* drop connection (if any) and set to Idle for connection retry */ int bgp_restart(struct bgp_peer *peer) { - peer->next_state = Idle; - bgp_clear(peer); + peer->next_state = Idle; + bgp_clear(peer); - /* restart now */ - peer->retry_time = time_now; - peer->retry_count = 0; + /* restart now */ + peer->retry_time = time_now; + peer->retry_count = 0; - /* connect */ - return bgp_connect(peer); + /* connect */ + return bgp_connect(peer); } static void bgp_set_retry(struct bgp_peer *peer) { - if (peer->retry_count++ < BGP_MAX_RETRY) - { - peer->retry_time = time_now + (BGP_RETRY_BACKOFF * peer->retry_count); - peer->next_state = Idle; - bgp_clear(peer); - } - else - bgp_halt(peer); /* give up */ -} - -/* convert ip/mask to CIDR notation */ -static void bgp_cidr(in_addr_t ip, in_addr_t mask, struct bgp_ip_prefix *pfx) -{ - int i; - u32 b; - - /* convert to prefix notation */ - pfx->len = 32; - pfx->prefix = ip; - - if (!mask) /* bogus */ - mask = 0xffffffff; - - for (i = 0; i < 32 && ((b = ntohl(1 << i)), !(mask & b)); i++) - { - pfx->len--; - pfx->prefix &= ~b; - } + if (peer->retry_count++ < BGP_MAX_RETRY) + { + peer->retry_time = time_now + (BGP_RETRY_BACKOFF * peer->retry_count); + peer->next_state = Idle; + bgp_clear(peer); + } + else + bgp_halt(peer); /* give up */ } /* insert route into list; sorted */ static struct bgp_route_list *bgp_insert_route(struct bgp_route_list *head, - struct bgp_route_list *new) + struct bgp_route_list *new) { - struct bgp_route_list *p = head; - struct bgp_route_list *e = 0; - - while (p && memcmp(&p->dest, &new->dest, sizeof(p->dest)) < 0) - { - e = p; - p = p->next; - } - - if (e) - { - new->next = e->next; - e->next = new; - } - else - { - new->next = head; - head = new; - } + struct bgp_route_list *p = head; + struct bgp_route_list *e = 0; + + while (p && memcmp(&p->dest, &new->dest, sizeof(p->dest)) < 0) + { + e = p; + p = p->next; + } + + if (e) + { + new->next = e->next; + e->next = new; + } + else + { + new->next = head; + head = new; + } + + return head; +} - return head; +/* insert route6 into list; sorted */ +static struct bgp_route6_list *bgp_insert_route6(struct bgp_route6_list *head, + struct bgp_route6_list *new) +{ + struct bgp_route6_list *p = head; + struct bgp_route6_list *e = 0; + + while (p && memcmp(&p->dest, &new->dest, sizeof(p->dest)) < 0) + { + e = p; + p = p->next; + } + + if (e) + { + new->next = e->next; + e->next = new; + } + else + { + new->next = head; + head = new; + } + + return head; } /* add route to list for peers */ @@ -357,973 +453,1337 @@ static struct bgp_route_list *bgp_insert_route(struct bgp_route_list *head, * that if that route is later deleted we don't have to be concerned * about adding back the more specific one). */ -int bgp_add_route(in_addr_t ip, in_addr_t mask) +int bgp_add_route(in_addr_t ip, int prefixlen) { - struct bgp_route_list *r = bgp_routes; - struct bgp_route_list add; - int i; + struct bgp_route_list *r = bgp_routes; + struct bgp_route_list add; + int i; - bgp_cidr(ip, mask, &add.dest); - add.next = 0; + add.dest.prefix = ip; + add.dest.len = prefixlen; + add.next = 0; - /* check for duplicate */ - while (r) - { - i = memcmp(&r->dest, &add.dest, sizeof(r->dest)); - if (!i) - return 1; /* already covered */ + /* check for duplicate */ + while (r) + { + i = memcmp(&r->dest, &add.dest, sizeof(r->dest)); + if (!i) + return 1; /* already covered */ - if (i > 0) - break; + if (i > 0) + break; - r = r->next; - } + r = r->next; + } - /* insert into route list; sorted */ - if (!(r = malloc(sizeof(*r)))) - { - log(0, 0, 0, 0, "Can't allocate route for %s/%d (%s)\n", - inet_toa(add.dest.prefix), add.dest.len, strerror(errno)); + /* insert into route list; sorted */ + if (!(r = malloc(sizeof(*r)))) + { + LOG(0, 0, 0, "Can't allocate route for %s/%d (%s)\n", + fmtaddr(add.dest.prefix, 0), add.dest.len, strerror(errno)); - return 0; - } + return 0; + } - memcpy(r, &add, sizeof(*r)); - bgp_routes = bgp_insert_route(bgp_routes, r); + memcpy(r, &add, sizeof(*r)); + bgp_routes = bgp_insert_route(bgp_routes, r); - /* flag established peers for update */ - for (i = 0; i < BGP_NUM_PEERS; i++) - if (bgp_peers[i].state == Established) - bgp_peers[i].update_routes = 1; + /* flag established peers for update */ + for (i = 0; i < BGP_NUM_PEERS; i++) + if (bgp_peers[i].state == Established) + bgp_peers[i].update_routes = 1; - log(4, 0, 0, 0, "Registered BGP route %s/%d\n", inet_toa(add.dest.prefix), - add.dest.len); + LOG(4, 0, 0, "Registered BGP route %s/%d\n", + fmtaddr(add.dest.prefix, 0), add.dest.len); - return 1; + return 1; +} + +/* add route to list for peers */ +/* + * Note: same provisions as above + */ +int bgp_add_route6(struct in6_addr ip, int prefixlen) +{ + struct bgp_route6_list *r = bgp_routes6; + struct bgp_route6_list add; + int i; + char ipv6addr[INET6_ADDRSTRLEN]; + + memcpy(&add.dest.prefix, &ip.s6_addr, 16); + add.dest.len = prefixlen; + add.next = 0; + + /* check for duplicate */ + while (r) + { + i = memcmp(&r->dest, &add.dest, sizeof(r->dest)); + if (!i) + return 1; /* already covered */ + + if (i > 0) + break; + + r = r->next; + } + + /* insert into route list; sorted */ + if (!(r = malloc(sizeof(*r)))) + { + LOG(0, 0, 0, "Can't allocate route for %s/%d (%s)\n", + inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN), add.dest.len, + strerror(errno)); + + return 0; + } + + memcpy(r, &add, sizeof(*r)); + bgp_routes6 = bgp_insert_route6(bgp_routes6, r); + + /* flag established peers for update */ + for (i = 0; i < BGP_NUM_PEERS; i++) + if (bgp_peers[i].state == Established + && bgp_peers[i].mp_handling == HandleIPv6Routes) + bgp_peers[i].update_routes6 = 1; + + LOG(4, 0, 0, "Registered BGP route %s/%d\n", + inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN), add.dest.len); + + return 1; } /* remove route from list for peers */ -int bgp_del_route(in_addr_t ip, in_addr_t mask) +int bgp_del_route(in_addr_t ip, int prefixlen) { - struct bgp_route_list *r = bgp_routes; - struct bgp_route_list *e = 0; - struct bgp_route_list del; - int i; + struct bgp_route_list *r = bgp_routes; + struct bgp_route_list *e = 0; + struct bgp_route_list del; + int i; + + del.dest.prefix = ip; + del.dest.len = prefixlen; + del.next = 0; + + /* find entry in routes list and remove */ + while (r) + { + i = memcmp(&r->dest, &del.dest, sizeof(r->dest)); + if (!i) + { + if (e) + e->next = r->next; + else + bgp_routes = r->next; - bgp_cidr(ip, mask, &del.dest); - del.next = 0; + free(r); + break; + } - /* find entry in routes list and remove */ - while (r) - { - i = memcmp(&r->dest, &del.dest, sizeof(r->dest)); - if (!i) - { - if (e) - e->next = r->next; - else - bgp_routes = r->next; + e = r; - free(r); - break; - } + if (i > 0) + r = 0; /* stop */ + else + r = r->next; + } - e = r; + /* not found */ + if (!r) + return 1; - if (i > 0) - r = 0; /* stop */ - else - r = r->next; - } + /* flag established peers for update */ + for (i = 0; i < BGP_NUM_PEERS; i++) + if (bgp_peers[i].state == Established) + bgp_peers[i].update_routes = 1; - /* not found */ - if (!r) - return 1; + LOG(4, 0, 0, "Removed BGP route %s/%d\n", + fmtaddr(del.dest.prefix, 0), del.dest.len); - /* flag established peers for update */ - for (i = 0; i < BGP_NUM_PEERS; i++) - if (bgp_peers[i].state == Established) - bgp_peers[i].update_routes = 1; + return 1; +} + +/* remove route from list for peers */ +int bgp_del_route6(struct in6_addr ip, int prefixlen) +{ + struct bgp_route6_list *r = bgp_routes6; + struct bgp_route6_list *e = 0; + struct bgp_route6_list del; + int i; + char ipv6addr[INET6_ADDRSTRLEN]; + + memcpy(&del.dest.prefix, &ip.s6_addr, 16); + del.dest.len = prefixlen; + del.next = 0; + + /* find entry in routes list and remove */ + while (r) + { + i = memcmp(&r->dest, &del.dest, sizeof(r->dest)); + if (!i) + { + if (e) + e->next = r->next; + else + bgp_routes6 = r->next; + + free(r); + break; + } - log(4, 0, 0, 0, "Removed BGP route %s/%d\n", inet_toa(del.dest.prefix), - del.dest.len); + e = r; + if (i > 0) + r = 0; /* stop */ + else + r = r->next; + } + + /* not found */ + if (!r) return 1; + + /* flag established peers for update */ + for (i = 0; i < BGP_NUM_PEERS; i++) + if (bgp_peers[i].state == Established + && bgp_peers[i].mp_handling == HandleIPv6Routes) + bgp_peers[i].update_routes6 = 1; + + LOG(4, 0, 0, "Removed BGP route %s/%d\n", + inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN), del.dest.len); + + return 1; } /* enable or disable routing */ void bgp_enable_routing(int enable) { - int i; + int i; - for (i = 0; i < BGP_NUM_PEERS; i++) - { - bgp_peers[i].routing = enable; + for (i = 0; i < BGP_NUM_PEERS; i++) + { + bgp_peers[i].routing = enable; - /* flag established peers for update */ - if (bgp_peers[i].state == Established) - bgp_peers[i].update_routes = 1; - } + /* flag established peers for update */ + if (bgp_peers[i].state == Established) + bgp_peers[i].update_routes = 1; + } - log(4, 0, 0, 0, "%s BGP routing\n", enable ? "Enabled" : "Suspended"); + LOG(4, 0, 0, "%s BGP routing\n", enable ? "Enabled" : "Suspended"); } -/* return a bitmask indicating if the socket should be added to the - read set (1) and or write set (2) for select */ -int bgp_select_state(struct bgp_peer *peer) +#ifdef HAVE_EPOLL +# include +#else +# include "fake_epoll.h" +#endif + +/* return a bitmask of the events required to poll this peer's fd */ +int bgp_set_poll() { - int flags = 0; + int i; - if (!bgp_configured) - return 0; + if (!bgp_configured) + return 0; + + for (i = 0; i < BGP_NUM_PEERS; i++) + { + struct bgp_peer *peer = &bgp_peers[i]; + int events = 0; if (peer->state == Disabled || peer->state == Idle) - return 0; + continue; if (peer->inbuf->done < BGP_MAX_PACKET_SIZE) - flags |= 1; + events |= EPOLLIN; + + if (peer->state == Connect || /* connection in progress */ + peer->update_routes || /* routing updates */ + peer->outbuf->packet.header.len) /* pending output */ + events |= EPOLLOUT; + + if (peer->events != events) + { + struct epoll_event ev; - if (peer->state == Connect || /* connection in progress */ - peer->update_routes || /* routing updates */ - peer->outbuf->packet.header.len) /* pending output */ - flags |= 2; + ev.events = peer->events = events; + ev.data.ptr = &peer->edata; + epoll_ctl(epollfd, EPOLL_CTL_MOD, peer->sock, &ev); + } + } - return flags; + return 1; } -/* process bgp peer */ -int bgp_process(struct bgp_peer *peer, int readable, int writable) +/* process bgp events/timers */ +int bgp_process(uint32_t events[]) { - if (!bgp_configured) - return 0; + int i; + + if (!bgp_configured) + return 0; + + for (i = 0; i < BGP_NUM_PEERS; i++) + { + struct bgp_peer *peer = &bgp_peers[i]; if (*peer->name && peer->cli_flag == BGP_CLI_RESTART) - return bgp_restart(peer); + { + bgp_restart(peer); + continue; + } if (peer->state == Disabled) - return 1; + continue; if (peer->cli_flag) { - switch (peer->cli_flag) + switch (peer->cli_flag) + { + case BGP_CLI_SUSPEND: + if (peer->routing) { - case BGP_CLI_SUSPEND: - if (peer->routing) - { - peer->routing = 0; - if (peer->state == Established) - peer->update_routes = 1; - } - - break; - - case BGP_CLI_ENABLE: - if (!peer->routing) - { - peer->routing = 1; - if (peer->state == Established) - peer->update_routes = 1; - } - - break; + peer->routing = 0; + if (peer->state == Established) + peer->update_routes = 1; + } + + break; + + case BGP_CLI_ENABLE: + if (!peer->routing) + { + peer->routing = 1; + if (peer->state == Established) + peer->update_routes = 1; } - peer->cli_flag = 0; + break; + } + + peer->cli_flag = 0; } /* handle empty/fill of buffers */ - if (writable) + if (events[i] & EPOLLOUT) { - int r = 1; - if (peer->state == Connect) - r = bgp_handle_connect(peer); - else if (peer->outbuf->packet.header.len) - r = bgp_write(peer); - - if (!r) - return 0; + int r = 1; + if (peer->state == Connect) + r = bgp_handle_connect(peer); + else if (peer->outbuf->packet.header.len) + r = bgp_write(peer); + + if (!r) + continue; } - if (readable) + if (events[i] & (EPOLLIN|EPOLLHUP)) { - if (!bgp_read(peer)) - return 0; + if (!bgp_read(peer)) + continue; } /* process input buffer contents */ while (peer->inbuf->done >= sizeof(peer->inbuf->packet.header) - && !peer->outbuf->packet.header.len) /* may need to queue a response */ + && !peer->outbuf->packet.header.len) /* may need to queue a response */ { - if (bgp_handle_input(peer) < 0) - return 0; + if (bgp_handle_input(peer) < 0) + continue; } /* process pending updates */ if (peer->update_routes - && !peer->outbuf->packet.header.len) /* ditto */ + && !peer->outbuf->packet.header.len) /* ditto */ { - if (!bgp_send_update(peer)) - return 0; + if (!bgp_send_update(peer)) + continue; } - /* process timers */ - if (peer->state == Established) + /* process pending IPv6 updates */ + if (peer->update_routes6 + && !peer->outbuf->packet.header.len) /* ditto */ { - if (time_now > peer->expire_time) - { - log(1, 0, 0, 0, "No message from BGP peer %s in %ds\n", - peer->name, peer->hold); + if (!bgp_send_update6(peer)) + continue; + } - bgp_send_notification(peer, BGP_ERR_HOLD_TIMER_EXP, 0); - return 0; - } + /* process timers */ + bgp_process_timers(peer); + } - if (time_now > peer->keepalive_time && !peer->outbuf->packet.header.len) - bgp_send_keepalive(peer); - } - else if (peer->state == Idle) - { - if (time_now > peer->retry_time) - return bgp_connect(peer); - } - else if (time_now > peer->state_time + BGP_KEEPALIVE_TIME) + return 1; +} + +/* process bgp timers only */ +void bgp_process_peers_timers() +{ + int i; + + if (!bgp_configured) + return; + + for (i = 0; i < BGP_NUM_PEERS; i++) + { + struct bgp_peer *peer = &bgp_peers[i]; + + if (peer->state == Disabled) + continue; + + bgp_process_timers(peer); + } +} + +static void bgp_process_timers(struct bgp_peer *peer) +{ + if (peer->state == Established) + { + if (time_now > peer->expire_time) { - log(1, 0, 0, 0, "%s timer expired for BGP peer %s\n", - bgp_state_str(peer->state), peer->name); + LOG(1, 0, 0, "No message from BGP peer %s in %ds\n", + peer->name, peer->hold); - return bgp_restart(peer); + bgp_send_notification(peer, BGP_ERR_HOLD_TIMER_EXP, 0); + return; } - return 1; + if (time_now > peer->keepalive_time && !peer->outbuf->packet.header.len) + bgp_send_keepalive(peer); + } + else if (peer->state == Idle) + { + if (time_now > peer->retry_time) + bgp_connect(peer); + } + else if (time_now > peer->state_time + BGP_STATE_TIME) + { + LOG(1, 0, 0, "%s timer expired for BGP peer %s\n", + bgp_state_str(peer->state), peer->name); + + bgp_restart(peer); + } } static void bgp_free_routes(struct bgp_route_list *routes) { - struct bgp_route_list *tmp; + struct bgp_route_list *tmp; - while ((tmp = routes)) - { - routes = tmp->next; - free(tmp); - } + while ((tmp = routes)) + { + routes = tmp->next; + free(tmp); + } } -static char const *bgp_state_str(enum bgp_state state) +static void bgp_free_routes6(struct bgp_route6_list *routes) { - switch (state) - { - case Disabled: return "Disabled"; - case Idle: return "Idle"; - case Connect: return "Connect"; - case Active: return "Active"; - case OpenSent: return "OpenSent"; - case OpenConfirm: return "OpenConfirm"; - case Established: return "Established"; - } + struct bgp_route6_list *tmp; - return "?"; + while ((tmp = routes)) + { + routes = tmp->next; + free(tmp); + } } -static char const *bgp_msg_type_str(u8 type) +char const *bgp_state_str(enum bgp_state state) { - switch (type) - { - case BGP_MSG_OPEN: return "OPEN"; - case BGP_MSG_UPDATE: return "UPDATE"; - case BGP_MSG_NOTIFICATION: return "NOTIFICATION"; - case BGP_MSG_KEEPALIVE: return "KEEPALIVE"; - } + switch (state) + { + case Disabled: return "Disabled"; + case Idle: return "Idle"; + case Connect: return "Connect"; + case Active: return "Active"; + case OpenSent: return "OpenSent"; + case OpenConfirm: return "OpenConfirm"; + case Established: return "Established"; + } + + return "?"; +} - return "?"; +static char const *bgp_msg_type_str(uint8_t type) +{ + switch (type) + { + case BGP_MSG_OPEN: return "OPEN"; + case BGP_MSG_UPDATE: return "UPDATE"; + case BGP_MSG_NOTIFICATION: return "NOTIFICATION"; + case BGP_MSG_KEEPALIVE: return "KEEPALIVE"; + } + + return "?"; } /* attempt to connect to peer */ static int bgp_connect(struct bgp_peer *peer) { - static int bgp_port = 0; - struct sockaddr_in addr; - - if (!bgp_port) + static int bgp_port = 0; + struct sockaddr_in addr; + struct sockaddr_in source_addr; + struct epoll_event ev; + + if (!bgp_port) + { + struct servent *serv; + if (!(serv = getservbyname("bgp", "tcp"))) { - struct servent *serv; - if (!(serv = getservbyname("bgp", "tcp"))) - { - log(0, 0, 0, 0, "Can't get bgp service (%s)\n", strerror(errno)); - return 0; - } - - bgp_port = serv->s_port; + LOG(0, 0, 0, "Can't get bgp service (%s)\n", strerror(errno)); + return 0; } - if ((peer->sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) + bgp_port = serv->s_port; + } + + if ((peer->sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) + { + LOG(0, 0, 0, "Can't create a socket for BGP peer %s (%s)\n", + peer->name, strerror(errno)); + + peer->state = peer->next_state = Disabled; + return 0; + } + + /* add to poll set */ + ev.events = peer->events = EPOLLOUT; + ev.data.ptr = &peer->edata; + epoll_ctl(epollfd, EPOLL_CTL_ADD, peer->sock, &ev); + + /* set to non-blocking */ + fcntl(peer->sock, F_SETFL, fcntl(peer->sock, F_GETFL, 0) | O_NONBLOCK); + + /* set source address */ + memset(&source_addr, 0, sizeof(source_addr)); + source_addr.sin_family = AF_INET; + source_addr.sin_addr.s_addr = peer->source_addr; /* defaults to INADDR_ANY */ + if (bind(peer->sock, (struct sockaddr *) &source_addr, sizeof(source_addr)) < 0) + { + LOG(1, 0, 0, "Can't set source address to %s: %s\n", + inet_ntoa(source_addr.sin_addr), strerror(errno)); + + bgp_set_retry(peer); + return 0; + } + + /* try connect */ + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_port = bgp_port; + addr.sin_addr.s_addr = peer->addr; + + while (connect(peer->sock, (struct sockaddr *) &addr, sizeof(addr)) == -1) + { + if (errno == EINTR) /* SIGALARM handler */ + continue; + + if (errno != EINPROGRESS) { - log(0, 0, 0, 0, "Can't create a socket for BGP peer %s (%s)\n", - peer->name, strerror(errno)); + LOG(1, 0, 0, "Can't connect to BGP peer %s (%s)\n", + inet_ntoa(addr.sin_addr), strerror(errno)); - peer->state = peer->next_state = Disabled; - return 0; + bgp_set_retry(peer); + return 0; } - /* set to non-blocking */ - fcntl(peer->sock, F_SETFL, fcntl(peer->sock, F_GETFL, 0) | O_NONBLOCK); - - /* try connect */ - memset(&addr, 0, sizeof(addr)); - addr.sin_family = AF_INET; - addr.sin_port = bgp_port; - addr.sin_addr.s_addr = peer->addr; - - while (connect(peer->sock, (struct sockaddr *) &addr, sizeof(addr)) == -1) - { - if (errno == EINTR) /* SIGALARM handler */ - continue; - - if (errno != EINPROGRESS) - { - log(1, 0, 0, 0, "Can't connect to BGP peer %s (%s)\n", - inet_ntoa(addr.sin_addr), strerror(errno)); - - bgp_set_retry(peer); - return 0; - } - - peer->state = Connect; - peer->state_time = time_now; + peer->state = Connect; + peer->state_time = time_now; - log(4, 0, 0, 0, "BGP peer %s: state Connect\n", peer->name); - return 1; - } + LOG(4, 0, 0, "BGP peer %s: state Connect\n", peer->name); + return 1; + } - peer->state = Active; - peer->state_time = time_now; - peer->retry_time = peer->retry_count = 0; + peer->state = Active; + peer->state_time = time_now; + peer->retry_time = peer->retry_count = 0; - log(4, 0, 0, 0, "BGP peer %s: state Active\n", inet_ntoa(addr.sin_addr)); + LOG(4, 0, 0, "BGP peer %s: state Active\n", inet_ntoa(addr.sin_addr)); - return bgp_send_open(peer); + return bgp_send_open(peer); } /* complete partial connection (state = Connect) */ static int bgp_handle_connect(struct bgp_peer *peer) { - int err = 0; - int len = sizeof(int); - getsockopt(peer->sock, SOL_SOCKET, SO_ERROR, &err, &len); - if (err) - { - log(1, 0, 0, 0, "Can't connect to BGP peer %s (%s)\n", peer->name, - strerror(err)); + int err = 0; + socklen_t len = sizeof(int); + getsockopt(peer->sock, SOL_SOCKET, SO_ERROR, &err, &len); + if (err) + { + LOG(1, 0, 0, "Can't connect to BGP peer %s (%s)\n", peer->name, + strerror(err)); - bgp_set_retry(peer); - return 0; - } + bgp_set_retry(peer); + return 0; + } - peer->state = Active; - peer->state_time = time_now; + peer->state = Active; + peer->state_time = time_now; - log(4, 0, 0, 0, "BGP peer %s: state Active\n", peer->name); + LOG(4, 0, 0, "BGP peer %s: state Active\n", peer->name); - return bgp_send_open(peer); + return bgp_send_open(peer); } /* initiate a write */ static int bgp_write(struct bgp_peer *peer) { - int len = htons(peer->outbuf->packet.header.len); - int r; + int len = htons(peer->outbuf->packet.header.len); + int r; - while ((r = write(peer->sock, &peer->outbuf->packet + peer->outbuf->done, - len - peer->outbuf->done)) == -1) - { - if (errno == EINTR) - continue; + while ((r = write(peer->sock, &peer->outbuf->packet + peer->outbuf->done, + len - peer->outbuf->done)) == -1) + { + if (errno == EINTR) + continue; - if (errno == EAGAIN) - return 1; + if (errno == EAGAIN) + return 1; - if (errno == EPIPE) - log(1, 0, 0, 0, "Connection to BGP peer %s closed\n", peer->name); - else - log(1, 0, 0, 0, "Can't write to BGP peer %s (%s)\n", peer->name, - strerror(errno)); + if (errno == EPIPE) + LOG(1, 0, 0, "Connection to BGP peer %s closed\n", peer->name); + else + LOG(1, 0, 0, "Can't write to BGP peer %s (%s)\n", peer->name, + strerror(errno)); - bgp_set_retry(peer); - return 0; - } + bgp_set_retry(peer); + return 0; + } - if (r < len) - { - peer->outbuf->done += r; - return 1; - } + if (r < len) + { + peer->outbuf->done += r; + return 1; + } - log(4, 0, 0, 0, "Sent %s to BGP peer %s\n", - bgp_msg_type_str(peer->outbuf->packet.header.type), peer->name); + LOG(4, 0, 0, "Sent %s to BGP peer %s\n", + bgp_msg_type_str(peer->outbuf->packet.header.type), peer->name); - peer->outbuf->packet.header.len = 0; - peer->outbuf->done = 0; + peer->outbuf->packet.header.len = 0; + peer->outbuf->done = 0; - if (peer->state == Established) - peer->keepalive_time = time_now + BGP_KEEPALIVE_TIME; + if (peer->state == Established) + peer->keepalive_time = time_now + peer->keepalive; - if (peer->state != peer->next_state) + if (peer->state != peer->next_state) + { + if (peer->next_state == Disabled || peer->next_state == Idle) { - if (peer->next_state == Disabled || peer->next_state == Idle) - { - bgp_clear(peer); - return 0; - } + bgp_clear(peer); + return 0; + } - peer->state = peer->next_state; - peer->state_time = time_now; + peer->state = peer->next_state; + peer->state_time = time_now; - log(4, 0, 0, 0, "BGP peer %s: state %s\n", peer->name, - bgp_state_str(peer->state)); - } + LOG(4, 0, 0, "BGP peer %s: state %s\n", peer->name, + bgp_state_str(peer->state)); + } - return 1; + return 1; } /* initiate a read */ static int bgp_read(struct bgp_peer *peer) { - int r; + int r; - while ((r = read(peer->sock, &peer->inbuf->packet + peer->inbuf->done, - BGP_MAX_PACKET_SIZE - peer->inbuf->done)) < 1) + while ((r = read(peer->sock, &peer->inbuf->packet + peer->inbuf->done, + BGP_MAX_PACKET_SIZE - peer->inbuf->done)) < 1) + { + if (!r) { - if (!r) - { - log(1, 0, 0, 0, "Connection to BGP peer %s closed\n", peer->name); - } - else - { - if (errno == EINTR) - continue; - - if (errno == EAGAIN) - return 1; + LOG(1, 0, 0, "Connection to BGP peer %s closed\n", peer->name); + } + else + { + if (errno == EINTR) + continue; - log(1, 0, 0, 0, "Can't read from BGP peer %s (%s)\n", peer->name, - strerror(errno)); - } + if (errno == EAGAIN) + return 1; - bgp_set_retry(peer); - return 0; + LOG(1, 0, 0, "Can't read from BGP peer %s (%s)\n", peer->name, + strerror(errno)); } - peer->inbuf->done += r; - return 1; + bgp_set_retry(peer); + return 0; + } + + peer->inbuf->done += r; + return 1; } /* process buffered packets */ static int bgp_handle_input(struct bgp_peer *peer) { - struct bgp_packet *p = &peer->inbuf->packet; - int len = ntohs(p->header.len); + struct bgp_packet *p = &peer->inbuf->packet; + int len = ntohs(p->header.len); + + if (len > BGP_MAX_PACKET_SIZE) + { + LOG(1, 0, 0, "Bad header length from BGP %s\n", peer->name); + bgp_send_notification(peer, BGP_ERR_HEADER, BGP_ERR_HDR_BAD_LEN); + return 0; + } + + if (peer->inbuf->done < len) + return 0; - if (len > BGP_MAX_PACKET_SIZE) + LOG(4, 0, 0, "Received %s from BGP peer %s\n", + bgp_msg_type_str(p->header.type), peer->name); + + switch (p->header.type) + { + case BGP_MSG_OPEN: { - log(1, 0, 0, 0, "Bad header length from BGP %s\n", peer->name); - bgp_send_notification(peer, BGP_ERR_HEADER, BGP_ERR_HDR_BAD_LEN); + struct bgp_data_open data; + int hold; + int i; + off_t param_offset, capability_offset; + struct bgp_opt_param *param; + uint8_t capabilities_len; + char *capabilities = NULL; + struct bgp_capability *capability; + struct bgp_mp_cap_param *mp_cap; + + for (i = 0; i < sizeof(p->header.marker); i++) + { + if ((unsigned char) p->header.marker[i] != 0xff) + { + LOG(1, 0, 0, "Invalid marker from BGP peer %s\n", + peer->name); + + bgp_send_notification(peer, BGP_ERR_HEADER, + BGP_ERR_HDR_NOT_SYNC); + + return 0; + } + } + + if (peer->state != OpenSent) + { + LOG(1, 0, 0, "OPEN from BGP peer %s in %s state\n", + peer->name, bgp_state_str(peer->state)); + + bgp_send_notification(peer, BGP_ERR_FSM, 0); return 0; - } + } + + memcpy(&data, p->data, len - sizeof(p->header)); - if (peer->inbuf->done < len) + if (data.version != BGP_VERSION) + { + LOG(1, 0, 0, "Bad version (%d) sent by BGP peer %s\n", + (int) data.version, peer->name); + + bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_OPN_VERSION); return 0; + } - log(4, 0, 0, 0, "Received %s from BGP peer %s\n", - bgp_msg_type_str(p->header.type), peer->name); + if (ntohs(data.as) != peer->as) + { + LOG(1, 0, 0, "Bad AS sent by BGP peer %s (got %d, " + "expected %d)\n", peer->name, (int) htons(data.as), + (int) peer->as); - switch (p->header.type) - { - case BGP_MSG_OPEN: + bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_OPN_BAD_AS); + return 0; + } + + if ((hold = ntohs(data.hold_time)) < 3) + { + LOG(1, 0, 0, "Bad hold time (%d) from BGP peer %s\n", + hold, peer->name); + + bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_OPN_HOLD_TIME); + return 0; + } + + /* pick lowest hold time */ + if (hold < peer->hold) + peer->hold = hold; + + /* adjust our keepalive based on negotiated hold value */ + if (peer->keepalive * 3 > peer->hold) + peer->keepalive = peer->hold / 3; + + /* check for optional parameters */ + /* 2 is for the size of type + len (both uint8_t) */ + for (param_offset = 0; + param_offset < data.opt_len; + param_offset += 2 + param->len) + { + param = (struct bgp_opt_param *)((char *)&data.opt_params + param_offset); + + /* sensible check */ + if (data.opt_len - param_offset < 2 + || param->len > data.opt_len - param_offset - 2) { - struct bgp_data_open data; - int i; - - for (i = 0; i < sizeof(p->header.marker); i++) - { - if ((unsigned char) p->header.marker[i] != 0xff) - { - log(1, 0, 0, 0, "Invalid marker from BGP peer %s\n", - peer->name); - - bgp_send_notification(peer, BGP_ERR_HEADER, - BGP_ERR_HDR_NOT_SYNC); - - return 0; - } - } - - if (peer->state != OpenSent) - { - log(1, 0, 0, 0, "OPEN from BGP peer %s in %s state\n", - peer->name, bgp_state_str(peer->state)); - - bgp_send_notification(peer, BGP_ERR_FSM, 0); - return 0; - } - - memcpy(&data, p->data, len - sizeof(p->header)); - - if (data.version != BGP_VERSION) - { - log(1, 0, 0, 0, "Bad version (%d) sent by BGP peer %s\n", - (int) data.version, peer->name); - - bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_OPN_VERSION); - return 0; - } - - if (ntohs(data.as) != peer->as) - { - log(1, 0, 0, 0, "Bad AS sent by BGP peer %s (got %d, " - "expected %d)\n", peer->name, (int) htons(data.as), - (int) peer->as); - - bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_OPN_BAD_AS); - return 0; - } - - if ((peer->hold = ntohs(data.hold_time)) < 10) - { - log(1, 0, 0, 0, "Bad hold time (%d) from BGP peer %s\n", - peer->hold, peer->name); - - bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_OPN_HOLD_TIME); - return 0; - } - - /* next transition requires an exchange of keepalives */ - bgp_send_keepalive(peer); - - /* FIXME: may need to check for optional params */ - } + LOG(1, 0, 0, "Malformed Optional Parameter list from BGP peer %s\n", + peer->name); - break; + bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_UNSPEC); + return 0; + } - case BGP_MSG_KEEPALIVE: - if (peer->state == OpenConfirm) + /* we know only one parameter type */ + if (param->type != BGP_PARAM_TYPE_CAPABILITY) { - peer->state = peer->next_state = Established; - peer->state_time = time_now; - peer->keepalive_time = time_now + BGP_KEEPALIVE_TIME; - peer->update_routes = 1; - peer->retry_count = 0; - peer->retry_time = 0; + LOG(1, 0, 0, "Unsupported Optional Parameter type %d from BGP peer %s\n", + param->type, peer->name); - log(4, 0, 0, 0, "BGP peer %s: state Established\n", peer->name); + bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_OPN_UNSUP_PARAM); + return 0; } - break; + capabilities_len = param->len; + capabilities = (char *)¶m->value; - case BGP_MSG_NOTIFICATION: - if (len > sizeof(p->header)) + /* look for BGP multiprotocol capability */ + for (capability_offset = 0; + capability_offset < capabilities_len; + capability_offset += 2 + capability->len) { - struct bgp_data_notification *notification = - (struct bgp_data_notification *) p->data; - - if (notification->error_code == BGP_ERR_CEASE) - { - log(4, 0, 0, 0, "BGP peer %s sent CEASE\n", peer->name); - bgp_halt(peer); - return 0; - } - - /* FIXME: should handle more notifications */ - log(4, 0, 0, 0, "BGP peer %s sent unhandled NOTIFICATION %d\n", - peer->name, (int) notification->error_code); - } + capability = (struct bgp_capability *)(capabilities + capability_offset); - break; + /* sensible check */ + if (capabilities_len - capability_offset < 2 + || capability->len > capabilities_len - capability_offset - 2) + { + LOG(1, 0, 0, "Malformed Capabilities list from BGP peer %s\n", + peer->name); + + bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_UNSPEC); + return 0; + } + + /* we only know one capability code */ + if (capability->code != BGP_CAP_CODE_MP + && capability->len != sizeof(struct bgp_mp_cap_param)) + { + LOG(4, 0, 0, "Unsupported Capability code %d from BGP peer %s\n", + capability->code, peer->name); + + /* we don't terminate, still; we just jump to the next one */ + continue; + } + + mp_cap = (struct bgp_mp_cap_param *)&capability->value; + /* the only tuple we support */ + if (ntohs(mp_cap->afi) != BGP_MP_AFI_IPv6 && mp_cap->safi != BGP_MP_SAFI_UNICAST) + { + LOG(4, 0, 0, "Unsupported multiprotocol AFI %d and SAFI %d from BGP peer %s\n", + mp_cap->afi, mp_cap->safi, peer->name); + + /* we don't terminate, still; we just jump to the next one */ + continue; + } + + /* yes it can! */ + peer->mp_handling = HandleIPv6Routes; + } + } + + if (peer->mp_handling != HandleIPv6Routes) + { + peer->mp_handling = DoesntHandleIPv6Routes; + if (config->ipv6_prefix.s6_addr[0]) + LOG(1, 0, 0, "Warning: BGP peer %s doesn't handle IPv6 prefixes updates\n", + peer->name); + } + + /* next transition requires an exchange of keepalives */ + bgp_send_keepalive(peer); } - /* reset timer */ - peer->expire_time = time_now + peer->hold; + break; - /* see if there's another message in the same packet/buffer */ - if (peer->inbuf->done > len) + case BGP_MSG_KEEPALIVE: + if (peer->state == OpenConfirm) { - peer->inbuf->done -= len; - memmove(p, (char *) p + len, peer->inbuf->done); + peer->state = peer->next_state = Established; + peer->state_time = time_now; + peer->keepalive_time = time_now + peer->keepalive; + peer->update_routes = 1; + peer->retry_count = 0; + peer->retry_time = 0; + + LOG(4, 0, 0, "BGP peer %s: state Established\n", peer->name); } - else + + break; + + case BGP_MSG_NOTIFICATION: + if (len > sizeof(p->header)) { - peer->inbuf->packet.header.len = 0; - peer->inbuf->done = 0; + struct bgp_data_notification *notification = + (struct bgp_data_notification *) p->data; + + if (notification->error_code == BGP_ERR_CEASE) + { + LOG(4, 0, 0, "BGP peer %s sent CEASE\n", peer->name); + bgp_set_retry(peer); + return 0; + } + + if (notification->error_code == BGP_ERR_OPEN + && notification->error_subcode == BGP_ERR_OPN_UNSUP_PARAM) + { + LOG(4, 0, 0, "BGP peer %s doesn't support BGP Capabilities\n", peer->name); + peer->mp_handling = DoesntHandleIPv6Routes; + bgp_set_retry(peer); + return 0; + } + + if (notification->error_code == BGP_ERR_OPEN + && notification->error_subcode == BGP_ERR_OPN_UNSUP_CAP) + { + /* the only capability we advertise is this one, so upon receiving + an "unsupported capability" message, we disable IPv6 routes for + this peer */ + LOG(4, 0, 0, "BGP peer %s doesn't support IPv6 routes advertisement\n", peer->name); + peer->mp_handling = DoesntHandleIPv6Routes; + break; + } + + /* FIXME: should handle more notifications */ + LOG(4, 0, 0, "BGP peer %s sent unhandled NOTIFICATION %d\n", + peer->name, (int) notification->error_code); } - return peer->inbuf->done; + break; + } + + /* reset timer */ + peer->expire_time = time_now + peer->hold; + + /* see if there's another message in the same packet/buffer */ + if (peer->inbuf->done > len) + { + peer->inbuf->done -= len; + memmove(p, (char *) p + len, peer->inbuf->done); + } + else + { + peer->inbuf->packet.header.len = 0; + peer->inbuf->done = 0; + } + + return peer->inbuf->done; } /* send/buffer OPEN message */ static int bgp_send_open(struct bgp_peer *peer) { - struct bgp_data_open data; - u16 len = sizeof(peer->outbuf->packet.header); - - memset(peer->outbuf->packet.header.marker, 0xff, - sizeof(peer->outbuf->packet.header.marker)); - - peer->outbuf->packet.header.type = BGP_MSG_OPEN; - - data.version = BGP_VERSION; - data.as = htons(our_as); - data.hold_time = htons(BGP_HOLD_TIME); + struct bgp_data_open data; + struct bgp_mp_cap_param mp_ipv6 = { htons(BGP_MP_AFI_IPv6), 0, BGP_MP_SAFI_UNICAST }; + struct bgp_capability cap_mp_ipv6; + struct bgp_opt_param param_cap_mp_ipv6; + uint16_t len = sizeof(peer->outbuf->packet.header); + + memset(peer->outbuf->packet.header.marker, 0xff, + sizeof(peer->outbuf->packet.header.marker)); + + peer->outbuf->packet.header.type = BGP_MSG_OPEN; + + data.version = BGP_VERSION; + data.as = htons(our_as); + data.hold_time = htons(peer->hold); + /* use the source IP we use as identifier, if available */ + if (peer->source_addr != INADDR_ANY) + data.identifier = peer->source_addr; + else data.identifier = my_address; + + /* if we know peer doesn't support MP (mp_handling == DoesntHandleIPv6Routes) + then don't add this parameter */ + if (config->ipv6_prefix.s6_addr[0] + && (peer->mp_handling == HandlingUnknown + || peer->mp_handling == HandleIPv6Routes)) + { + /* construct the param and capability */ + cap_mp_ipv6.code = BGP_CAP_CODE_MP; + cap_mp_ipv6.len = sizeof(mp_ipv6); + memcpy(&cap_mp_ipv6.value, &mp_ipv6, cap_mp_ipv6.len); + + param_cap_mp_ipv6.type = BGP_PARAM_TYPE_CAPABILITY; + param_cap_mp_ipv6.len = 2 + sizeof(mp_ipv6); + memcpy(¶m_cap_mp_ipv6.value, &cap_mp_ipv6, param_cap_mp_ipv6.len); + + data.opt_len = 2 + param_cap_mp_ipv6.len; + memcpy(&data.opt_params, ¶m_cap_mp_ipv6, data.opt_len); + } + else data.opt_len = 0; - memcpy(peer->outbuf->packet.data, &data, BGP_DATA_OPEN_SIZE); - len += BGP_DATA_OPEN_SIZE; + memcpy(peer->outbuf->packet.data, &data, BGP_DATA_OPEN_SIZE + data.opt_len); + len += BGP_DATA_OPEN_SIZE + data.opt_len; - peer->outbuf->packet.header.len = htons(len); - peer->outbuf->done = 0; - peer->next_state = OpenSent; + peer->outbuf->packet.header.len = htons(len); + peer->outbuf->done = 0; + peer->next_state = OpenSent; - return bgp_write(peer); + return bgp_write(peer); } /* send/buffer KEEPALIVE message */ static int bgp_send_keepalive(struct bgp_peer *peer) { - memset(peer->outbuf->packet.header.marker, 0xff, - sizeof(peer->outbuf->packet.header.marker)); + memset(peer->outbuf->packet.header.marker, 0xff, + sizeof(peer->outbuf->packet.header.marker)); - peer->outbuf->packet.header.type = BGP_MSG_KEEPALIVE; - peer->outbuf->packet.header.len = - htons(sizeof(peer->outbuf->packet.header)); + peer->outbuf->packet.header.type = BGP_MSG_KEEPALIVE; + peer->outbuf->packet.header.len = + htons(sizeof(peer->outbuf->packet.header)); - peer->outbuf->done = 0; - peer->next_state = (peer->state == OpenSent) ? OpenConfirm : peer->state; + peer->outbuf->done = 0; + peer->next_state = (peer->state == OpenSent) ? OpenConfirm : peer->state; - return bgp_write(peer); + return bgp_write(peer); } /* send/buffer UPDATE message */ static int bgp_send_update(struct bgp_peer *peer) { - u16 unf_len = 0; - u16 attr_len; - u16 len = sizeof(peer->outbuf->packet.header); - struct bgp_route_list *have = peer->routes; - struct bgp_route_list *want = peer->routing ? bgp_routes : 0; - struct bgp_route_list *e = 0; - struct bgp_route_list *add = 0; - int s; - - char *data = (char *) &peer->outbuf->packet.data; - - /* need leave room for attr_len, bgp_path_attrs and one prefix */ - char *max = (char *) &peer->outbuf->packet.data - + sizeof(peer->outbuf->packet.data) - - sizeof(attr_len) - peer->path_attr_len - sizeof(struct bgp_ip_prefix); - - /* skip over unf_len */ - data += sizeof(unf_len); - len += sizeof(unf_len); - - memset(peer->outbuf->packet.header.marker, 0xff, - sizeof(peer->outbuf->packet.header.marker)); - - peer->outbuf->packet.header.type = BGP_MSG_UPDATE; - - peer->update_routes = 0; /* tentatively clear */ + uint16_t unf_len = 0; + uint16_t attr_len; + uint16_t len = sizeof(peer->outbuf->packet.header); + struct bgp_route_list *have = peer->routes; + struct bgp_route_list *want = peer->routing ? bgp_routes : 0; + struct bgp_route_list *e = 0; + struct bgp_route_list *add = 0; + int s; + + char *data = (char *) &peer->outbuf->packet.data; + + /* need leave room for attr_len, bgp_path_attrs and one prefix */ + char *max = (char *) &peer->outbuf->packet.data + + sizeof(peer->outbuf->packet.data) + - sizeof(attr_len) - peer->path_attr_len - sizeof(struct bgp_ip_prefix); + + /* skip over unf_len */ + data += sizeof(unf_len); + len += sizeof(unf_len); + + memset(peer->outbuf->packet.header.marker, 0xff, + sizeof(peer->outbuf->packet.header.marker)); + + peer->outbuf->packet.header.type = BGP_MSG_UPDATE; + + peer->update_routes = 0; /* tentatively clear */ + + /* find differences */ + while ((have || want) && data < (max - sizeof(struct bgp_ip_prefix))) + { + if (have) + s = want + ? memcmp(&have->dest, &want->dest, sizeof(have->dest)) + : -1; + else + s = 1; - /* find differences */ - while ((have || want) && data < (max - sizeof(struct bgp_ip_prefix))) + if (s < 0) /* found one to delete */ { - if (have) - s = want - ? memcmp(&have->dest, &want->dest, sizeof(have->dest)) - : -1; - else - s = 1; - - if (s < 0) /* found one to delete */ - { - struct bgp_route_list *tmp = have; - have = have->next; + struct bgp_route_list *tmp = have; + have = have->next; - s = BGP_IP_PREFIX_SIZE(tmp->dest); - memcpy(data, &tmp->dest, s); - data += s; - unf_len += s; - len += s; + s = BGP_IP_PREFIX_SIZE(tmp->dest); + memcpy(data, &tmp->dest, s); + data += s; + unf_len += s; + len += s; - log(5, 0, 0, 0, "Withdrawing route %s/%d from BGP peer %s\n", - inet_toa(tmp->dest.prefix), tmp->dest.len, peer->name); + LOG(5, 0, 0, "Withdrawing route %s/%d from BGP peer %s\n", + fmtaddr(tmp->dest.prefix, 0), tmp->dest.len, peer->name); - free(tmp); + free(tmp); - if (e) - e->next = have; - else - peer->routes = have; - } - else - { - if (!s) /* same */ - { - e = have; /* stash the last found to relink above */ - have = have->next; - want = want->next; - } - else if (s > 0) /* addition reqd. */ - { - if (add) - { - peer->update_routes = 1; /* only one add per packet */ - if (!have) - break; - } - else - add = want; - - if (want) - want = want->next; - } - } + if (e) + e->next = have; + else + peer->routes = have; } - - if (have || want) - peer->update_routes = 1; /* more to do */ - - /* anything changed? */ - if (!(unf_len || add)) - return 1; - - /* go back and insert unf_len */ - unf_len = htons(unf_len); - memcpy(&peer->outbuf->packet.data, &unf_len, sizeof(unf_len)); - - if (add) + else { - if (!(e = malloc(sizeof(*e)))) + if (!s) /* same */ + { + e = have; /* stash the last found to relink above */ + have = have->next; + want = want->next; + } + else if (s > 0) /* addition reqd. */ + { + if (add) { - log(0, 0, 0, 0, "Can't allocate route for %s/%d (%s)\n", - inet_toa(add->dest.prefix), add->dest.len, strerror(errno)); - - return 0; + peer->update_routes = 1; /* only one add per packet */ + if (!have) + break; } + else + add = want; - memcpy(e, add, sizeof(*e)); - e->next = 0; - peer->routes = bgp_insert_route(peer->routes, e); - - attr_len = htons(peer->path_attr_len); - memcpy(data, &attr_len, sizeof(attr_len)); - data += sizeof(attr_len); - len += sizeof(attr_len); - - memcpy(data, peer->path_attrs, peer->path_attr_len); - data += peer->path_attr_len; - len += peer->path_attr_len; - - s = BGP_IP_PREFIX_SIZE(add->dest); - memcpy(data, &add->dest, s); - data += s; - len += s; - - log(5, 0, 0, 0, "Advertising route %s/%d to BGP peer %s\n", - inet_toa(add->dest.prefix), add->dest.len, peer->name); + if (want) + want = want->next; + } } - else - { - attr_len = 0; - memcpy(data, &attr_len, sizeof(attr_len)); - data += sizeof(attr_len); - len += sizeof(attr_len); - } - - peer->outbuf->packet.header.len = htons(len); - peer->outbuf->done = 0; - - return bgp_write(peer); -} + } -/* send/buffer NOTIFICATION message */ -static int bgp_send_notification(struct bgp_peer *peer, u8 code, u8 subcode) -{ - struct bgp_data_notification data; - u16 len = 0; - - data.error_code = code; - len += sizeof(data.error_code); + if (have || want) + peer->update_routes = 1; /* more to do */ - data.error_subcode = subcode; - len += sizeof(data.error_code); - - memset(peer->outbuf->packet.header.marker, 0xff, - sizeof(peer->outbuf->packet.header.marker)); - - peer->outbuf->packet.header.type = BGP_MSG_NOTIFICATION; - peer->outbuf->packet.header.len = - htons(sizeof(peer->outbuf->packet.header) + len); + /* anything changed? */ + if (!(unf_len || add)) + return 1; - memcpy(peer->outbuf->packet.data, &data, len); + /* go back and insert unf_len */ + unf_len = htons(unf_len); + memcpy(&peer->outbuf->packet.data, &unf_len, sizeof(unf_len)); - peer->outbuf->done = 0; - peer->next_state = code == BGP_ERR_CEASE ? Disabled : Idle; + if (add) + { + if (!(e = malloc(sizeof(*e)))) + { + LOG(0, 0, 0, "Can't allocate route for %s/%d (%s)\n", + fmtaddr(add->dest.prefix, 0), add->dest.len, strerror(errno)); - /* we're dying; ignore any pending input */ - peer->inbuf->packet.header.len = 0; - peer->inbuf->done = 0; + return 0; + } - return bgp_write(peer); + memcpy(e, add, sizeof(*e)); + e->next = 0; + peer->routes = bgp_insert_route(peer->routes, e); + + attr_len = htons(peer->path_attr_len); + memcpy(data, &attr_len, sizeof(attr_len)); + data += sizeof(attr_len); + len += sizeof(attr_len); + + memcpy(data, peer->path_attrs, peer->path_attr_len); + data += peer->path_attr_len; + len += peer->path_attr_len; + + s = BGP_IP_PREFIX_SIZE(add->dest); + memcpy(data, &add->dest, s); + data += s; + len += s; + + LOG(5, 0, 0, "Advertising route %s/%d to BGP peer %s\n", + fmtaddr(add->dest.prefix, 0), add->dest.len, peer->name); + } + else + { + attr_len = 0; + memcpy(data, &attr_len, sizeof(attr_len)); + data += sizeof(attr_len); + len += sizeof(attr_len); + } + + peer->outbuf->packet.header.len = htons(len); + peer->outbuf->done = 0; + + return bgp_write(peer); } -/* CLI stuff */ - -#include - -int cmd_show_bgp(struct cli_def *cli, char *command, char **argv, int argc) +/* send/buffer UPDATE message for IPv6 routes */ +static int bgp_send_update6(struct bgp_peer *peer) { - int i; - int hdr = 0; - char *addr; + uint16_t attr_len; + uint16_t unreach_len = 0; + char *unreach_len_pos; + uint8_t reach_len; + uint16_t len = sizeof(peer->outbuf->packet.header); + struct bgp_route6_list *have = peer->routes6; + struct bgp_route6_list *want = peer->routing ? bgp_routes6 : 0; + struct bgp_route6_list *e = 0; + struct bgp_route6_list *add = 0; + int s; + char ipv6addr[INET6_ADDRSTRLEN]; + + char *data = (char *) &peer->outbuf->packet.data; + + /* need leave room for attr_len, bgp_path_attrs and one prefix */ + char *max = (char *) &peer->outbuf->packet.data + + sizeof(peer->outbuf->packet.data) + - sizeof(attr_len) - peer->path_attr_len_without_nexthop + - BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE - sizeof(struct bgp_ip6_prefix); + + memset(peer->outbuf->packet.header.marker, 0xff, + sizeof(peer->outbuf->packet.header.marker)); + + peer->outbuf->packet.header.type = BGP_MSG_UPDATE; + + /* insert non-MP unfeasible routes length */ + memcpy(data, &unreach_len, sizeof(unreach_len)); + /* skip over it and attr_len too; it will be filled when known */ + data += sizeof(unreach_len) + sizeof(attr_len); + len += sizeof(unreach_len) + sizeof(attr_len); + + /* copy usual attributes */ + memcpy(data, peer->path_attrs, peer->path_attr_len_without_nexthop); + data += peer->path_attr_len_without_nexthop; + attr_len = peer->path_attr_len_without_nexthop; + + /* copy MP unreachable NLRI heading */ + memcpy(data, peer->mp_unreach_nlri_partial, + BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE); + /* remember where to update this attr len */ + unreach_len_pos = data + 2; + data += BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE; + attr_len += BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE; + + peer->update_routes6 = 0; /* tentatively clear */ + + /* find differences */ + while ((have || want) && data < (max - sizeof(struct bgp_ip6_prefix))) + { + if (have) + s = want + ? memcmp(&have->dest, &want->dest, sizeof(have->dest)) + : -1; + else + s = 1; - if (!bgp_configured) - return CLI_OK; + if (s < 0) /* found one to delete */ + { + struct bgp_route6_list *tmp = have; + have = have->next; - if (CLI_HELP_REQUESTED) - return cli_arg_help(cli, 1, - "A.B.C.D", "BGP peer address", - "NAME", "BGP peer name", - NULL); + s = BGP_IP_PREFIX_SIZE(tmp->dest); + memcpy(data, &tmp->dest, s); + data += s; + unreach_len += s; + attr_len += s; - cli_print(cli, "BGPv%d router identifier %s, local AS number %d, " - "hold time %ds", BGP_VERSION, inet_toa(my_address), (int) our_as, - BGP_HOLD_TIME); + LOG(5, 0, 0, "Withdrawing route %s/%d from BGP peer %s\n", + inet_ntop(AF_INET6, &tmp->dest.prefix, ipv6addr, INET6_ADDRSTRLEN), + tmp->dest.len, peer->name); - time(&time_now); + free(tmp); - for (i = 0; i < BGP_NUM_PEERS; i++) + if (e) + e->next = have; + else + peer->routes6 = have; + } + else { - if (!*bgp_peers[i].name) - continue; - - addr = inet_toa(bgp_peers[i].addr); - if (argc && strcmp(addr, argv[0]) && - strncmp(bgp_peers[i].name, argv[0], strlen(argv[0]))) - continue; - - if (!hdr++) + if (!s) /* same */ + { + e = have; /* stash the last found to relink above */ + have = have->next; + want = want->next; + } + else if (s > 0) /* addition reqd. */ + { + if (add) { - cli_print(cli, ""); - cli_print(cli, "Peer AS Address " - "State Retries Retry in Route Pend"); - cli_print(cli, "------------------ ----- --------------- " - "----------- ------- -------- ----- ----"); + peer->update_routes6 = 1; /* only one add per packet */ + if (!have) + break; } + else + add = want; - cli_print(cli, "%-18.18s %5d %15s %-11s %7d %7ds %5s %4s", - bgp_peers[i].name, - bgp_peers[i].as, - addr, - bgp_state_str(bgp_peers[i].state), - bgp_peers[i].retry_count, - bgp_peers[i].retry_time ? bgp_peers[i].retry_time - time_now : 0, - bgp_peers[i].routing ? "yes" : "no", - bgp_peers[i].update_routes ? "yes" : "no"); + if (want) + want = want->next; + } } + } - return CLI_OK; -} + if (have || want) + peer->update_routes6 = 1; /* more to do */ -int cmd_suspend_bgp(struct cli_def *cli, char *command, char **argv, int argc) -{ - int i; - char *addr; - - if (!bgp_configured) - return CLI_OK; - - if (CLI_HELP_REQUESTED) - return cli_arg_help(cli, 1, - "A.B.C.D", "BGP peer address", - "NAME", "BGP peer name", - NULL); + /* anything changed? */ + if (!(unreach_len || add)) + return 1; - for (i = 0; i < BGP_NUM_PEERS; i++) + if (unreach_len) + { + /* go back and insert MP unreach_len */ + unreach_len += sizeof(struct bgp_attr_mp_unreach_nlri_partial); + unreach_len = htons(unreach_len); + memcpy(unreach_len_pos, &unreach_len, sizeof(unreach_len)); + } + else + { + /* we can remove this attribute, then */ + data -= BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE; + attr_len -= BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE; + } + + if (add) + { + if (!(e = malloc(sizeof(*e)))) { - if (bgp_peers[i].state != Established) - continue; - - if (!bgp_peers[i].routing) - continue; + LOG(0, 0, 0, "Can't allocate route for %s/%d (%s)\n", + inet_ntop(AF_INET6, &add->dest.prefix, ipv6addr, INET6_ADDRSTRLEN), + add->dest.len, strerror(errno)); - addr = inet_toa(bgp_peers[i].addr); - if (argc && strcmp(addr, argv[0]) && strcmp(bgp_peers[i].name, argv[0])) - continue; - - bgp_peers[i].cli_flag = BGP_CLI_SUSPEND; - cli_print(cli, "Suspending peer %s", bgp_peers[i].name); + return 0; } - return CLI_OK; -} + memcpy(e, add, sizeof(*e)); + e->next = 0; + peer->routes6 = bgp_insert_route6(peer->routes6, e); -int cmd_no_suspend_bgp(struct cli_def *cli, char *command, char **argv, int argc) -{ - int i; - char *addr; + /* copy MP reachable NLRI heading */ + memcpy(data, peer->mp_reach_nlri_partial, + BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE); + /* with proper len */ + reach_len = BGP_IP_PREFIX_SIZE(add->dest); + data[2] = sizeof(struct bgp_attr_mp_reach_nlri_partial) + reach_len; + data += BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE; + attr_len += BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE; - if (!bgp_configured) - return CLI_OK; + memcpy(data, &add->dest, reach_len); + data += reach_len; + attr_len += reach_len; - if (CLI_HELP_REQUESTED) - return cli_arg_help(cli, 1, - "A.B.C.D", "BGP peer address", - "NAME", "BGP peer name", - NULL); + LOG(5, 0, 0, "Advertising route %s/%d to BGP peer %s\n", + inet_ntop(AF_INET6, &add->dest.prefix, ipv6addr, INET6_ADDRSTRLEN), + add->dest.len, peer->name); + } - for (i = 0; i < BGP_NUM_PEERS; i++) - { - if (bgp_peers[i].state != Established) - continue; + /* update len with attributes we added */ + len += attr_len; - if (bgp_peers[i].routing) - continue; - - addr = inet_toa(bgp_peers[i].addr); - if (argc && strcmp(addr, argv[0]) && - strncmp(bgp_peers[i].name, argv[0], strlen(argv[0]))) - continue; + /* go back and insert attr_len */ + attr_len = htons(attr_len); + memcpy((char *)&peer->outbuf->packet.data + 2, &attr_len, sizeof(attr_len)); - bgp_peers[i].cli_flag = BGP_CLI_ENABLE; - cli_print(cli, "Un-suspending peer %s", bgp_peers[i].name); - } + peer->outbuf->packet.header.len = htons(len); + peer->outbuf->done = 0; - return CLI_OK; + return bgp_write(peer); } -int cmd_restart_bgp(struct cli_def *cli, char *command, char **argv, int argc) +/* send/buffer NOTIFICATION message */ +static int bgp_send_notification(struct bgp_peer *peer, uint8_t code, + uint8_t subcode) { - int i; - char *addr; + struct bgp_data_notification data; + uint16_t len = 0; - if (!bgp_configured) - return CLI_OK; + data.error_code = code; + len += sizeof(data.error_code); - if (CLI_HELP_REQUESTED) - return cli_arg_help(cli, 1, - "A.B.C.D", "BGP peer address", - "NAME", "BGP peer name", - NULL); + data.error_subcode = subcode; + len += sizeof(data.error_code); - for (i = 0; i < BGP_NUM_PEERS; i++) - { - if (!*bgp_peers[i].name) - continue; + memset(peer->outbuf->packet.header.marker, 0xff, + sizeof(peer->outbuf->packet.header.marker)); - addr = inet_toa(bgp_peers[i].addr); - if (argc && strcmp(addr, argv[0]) && strncmp(bgp_peers[i].name, argv[0], strlen(argv[0]))) - continue; + peer->outbuf->packet.header.type = BGP_MSG_NOTIFICATION; + peer->outbuf->packet.header.len = + htons(sizeof(peer->outbuf->packet.header) + len); - bgp_peers[i].cli_flag = BGP_CLI_RESTART; - cli_print(cli, "Restarting peer %s", bgp_peers[i].name); - } + memcpy(peer->outbuf->packet.data, &data, len); + + peer->outbuf->done = 0; + peer->next_state = code == BGP_ERR_CEASE ? Disabled : Idle; + + /* we're dying; ignore any pending input */ + peer->inbuf->packet.header.len = 0; + peer->inbuf->done = 0; - return CLI_OK; + return bgp_write(peer); }