X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/d4905790250059e6dd95082a1b3cc13b7c4a6c68..d2848cebc450b4d1e66a4b7bf290167f2870b618:/bgp.c diff --git a/bgp.c b/bgp.c index b5d0440..ea4ef45 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 @@ -31,11 +29,10 @@ 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 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 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 +41,335 @@ 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_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 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_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, 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 */ + 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->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(); + + /* NEXT_HOP */ + a.flags = BGP_PATH_ATTR_FLAG_TRANS; + a.code = BGP_PATH_ATTR_CODE_NEXT_HOP; + ip = my_address; /* we're it */ + a.data.s.len = sizeof(ip); + memcpy(a.data.s.value, &ip, sizeof(ip)); + + 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_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) + 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(); + } - /* 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 { - 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)); - } - - ADD_ATTRIBUTE(); + /* 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)); - /* NEXT_HOP */ - a.flags = BGP_PATH_ATTR_FLAG_TRANS; - a.code = BGP_PATH_ATTR_CODE_NEXT_HOP; - ip = my_address; /* we're it */ - a.data.s.len = sizeof(ip); - memcpy(a.data.s.value, &ip, sizeof(ip)); + ADD_ATTRIBUTE(); - ADD_ATTRIBUTE(); + 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)); - /* 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)); + return 0; + } - ADD_ATTRIBUTE(); + memcpy(peer->path_attrs, path_attrs, peer->path_attr_len); - if (ibgp) - { - u32 local_pref = htonl(BGP_LOCAL_PREF); + LOG(4, 0, 0, "Initiating BGP connection to %s (routing %s)\n", + name, enable ? "enabled" : "suspended"); - /* 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)); + /* we have at least one peer configured */ + bgp_configured = 1; - ADD_ATTRIBUTE(); - } - - /* 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(); - - 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)); - - return 0; - } - - memcpy(peer->path_attrs, path_attrs, peer->path_attr_len); - - log(4, 0, 0, 0, "Initiating BGP connection to %s (routing %s)\n", - name, enable ? "enabled" : "suspended"); - - /* 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; - } + if (peer->sock != -1) + { + close(peer->sock); + peer->sock = -1; + } - peer->keepalive_time = 0; - peer->hold = 0; - peer->expire_time = 0; + peer->keepalive_time = 0; + peer->expire_time = 0; - bgp_free_routes(peer->routes); - peer->routes = 0; + peer->keepalive = peer->init_keepalive; + peer->hold = peer->init_hold; - peer->outbuf->packet.header.len = 0; - peer->outbuf->done = 0; - peer->inbuf->packet.header.len = 0; - peer->inbuf->done = 0; + bgp_free_routes(peer->routes); + peer->routes = 0; - peer->cli_flag = 0; + peer->outbuf->packet.header.len = 0; + peer->outbuf->done = 0; + peer->inbuf->packet.header.len = 0; + peer->inbuf->done = 0; - if (peer->state != peer->next_state) - { - peer->state = peer->next_state; - peer->state_time = time_now; + peer->cli_flag = 0; + peer->events = 0; - log(4, 0, 0, 0, "BGP peer %s: state %s\n", peer->name, - bgp_state_str(peer->next_state)); - } + if (peer->state != peer->next_state) + { + peer->state = peer->next_state; + peer->state_time = time_now; + + 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 */ + 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; + int i; + uint32_t b; - /* convert to prefix notation */ - pfx->len = 32; - pfx->prefix = ip; + /* convert to prefix notation */ + pfx->len = 32; + pfx->prefix = ip; - if (!mask) /* bogus */ - mask = 0xffffffff; + if (!mask) /* bogus */ + mask = 0xffffffff; - for (i = 0; i < 32 && ((b = ntohl(1 << i)), !(mask & b)); i++) - { - pfx->len--; - pfx->prefix &= ~b; - } + for (i = 0; i < 32 && ((b = ntohl(1 << i)), !(mask & b)); i++) + { + pfx->len--; + pfx->prefix &= ~b; + } } /* 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; - } - - return head; + 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; } /* add route to list for peers */ @@ -359,971 +381,862 @@ static struct bgp_route_list *bgp_insert_route(struct bgp_route_list *head, */ int bgp_add_route(in_addr_t ip, in_addr_t mask) { - 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; + bgp_cidr(ip, mask, &add.dest); + 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; } /* remove route from list for peers */ int bgp_del_route(in_addr_t ip, in_addr_t mask) { - struct bgp_route_list *r = bgp_routes; - struct bgp_route_list *e = 0; - struct bgp_route_list del; - int i; - - bgp_cidr(ip, mask, &del.dest); - del.next = 0; - - /* find entry in routes list and remove */ - while (r) + struct bgp_route_list *r = bgp_routes; + struct bgp_route_list *e = 0; + struct bgp_route_list del; + int i; + + bgp_cidr(ip, mask, &del.dest); + del.next = 0; + + /* find entry in routes list and remove */ + while (r) + { + i = memcmp(&r->dest, &del.dest, sizeof(r->dest)); + if (!i) { - i = memcmp(&r->dest, &del.dest, sizeof(r->dest)); - if (!i) - { - if (e) - e->next = r->next; - else - bgp_routes = r->next; + if (e) + e->next = r->next; + else + bgp_routes = r->next; - free(r); - break; - } + free(r); + break; + } - e = r; + e = r; - if (i > 0) - r = 0; /* stop */ - else - r = r->next; - } + if (i > 0) + r = 0; /* stop */ + else + r = r->next; + } - /* not found */ - if (!r) - return 1; + /* 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].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, "Removed BGP route %s/%d\n", inet_toa(del.dest.prefix), - del.dest.len); + LOG(4, 0, 0, "Removed BGP route %s/%d\n", + fmtaddr(del.dest.prefix, 0), del.dest.len); - return 1; + 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 */ - flags |= 2; + 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; - return flags; + ev.events = peer->events = events; + ev.data.ptr = &peer->edata; + epoll_ctl(epollfd, EPOLL_CTL_MOD, peer->sock, &ev); + } + } + + 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) { - 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 (time_now > peer->expire_time) + { + LOG(1, 0, 0, "No message from BGP peer %s in %ds\n", + peer->name, peer->hold); - bgp_send_notification(peer, BGP_ERR_HOLD_TIMER_EXP, 0); - return 0; - } + bgp_send_notification(peer, BGP_ERR_HOLD_TIMER_EXP, 0); + continue; + } - if (time_now > peer->keepalive_time && !peer->outbuf->packet.header.len) - bgp_send_keepalive(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); + if (time_now > peer->retry_time) + bgp_connect(peer); } - else if (time_now > peer->state_time + BGP_KEEPALIVE_TIME) + else if (time_now > peer->state_time + BGP_STATE_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, "%s timer expired for BGP peer %s\n", + bgp_state_str(peer->state), peer->name); - return bgp_restart(peer); + bgp_restart(peer); } + } - return 1; + return 1; } 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) +char const *bgp_state_str(enum bgp_state state) { - 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 "?"; + 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 "?"; } -static char const *bgp_msg_type_str(u8 type) +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 "?"; + 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 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) - { - log(0, 0, 0, 0, "Can't create a socket for BGP peer %s (%s)\n", - peer->name, strerror(errno)); + bgp_port = serv->s_port; + } - peer->state = peer->next_state = Disabled; - return 0; - } + 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)); - /* set to non-blocking */ - fcntl(peer->sock, F_SETFL, fcntl(peer->sock, F_GETFL, 0) | O_NONBLOCK); + peer->state = peer->next_state = Disabled; + 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; + /* add to poll set */ + ev.events = peer->events = EPOLLOUT; + ev.data.ptr = &peer->edata; + epoll_ctl(epollfd, EPOLL_CTL_ADD, peer->sock, &ev); - while (connect(peer->sock, (struct sockaddr *) &addr, sizeof(addr)) == -1) - { - if (errno == EINTR) /* SIGALARM handler */ - continue; + /* set to non-blocking */ + fcntl(peer->sock, F_SETFL, fcntl(peer->sock, F_GETFL, 0) | O_NONBLOCK); - if (errno != EINPROGRESS) - { - log(1, 0, 0, 0, "Can't connect to BGP peer %s (%s)\n", - inet_ntoa(addr.sin_addr), strerror(errno)); + /* try connect */ + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_port = bgp_port; + addr.sin_addr.s_addr = peer->addr; - bgp_set_retry(peer); - return 0; - } + while (connect(peer->sock, (struct sockaddr *) &addr, sizeof(addr)) == -1) + { + if (errno == EINTR) /* SIGALARM handler */ + continue; - peer->state = Connect; - peer->state_time = time_now; + if (errno != EINPROGRESS) + { + LOG(1, 0, 0, "Can't connect to BGP peer %s (%s)\n", + inet_ntoa(addr.sin_addr), strerror(errno)); - log(4, 0, 0, 0, "BGP peer %s: state Connect\n", peer->name); - return 1; + bgp_set_retry(peer); + return 0; } - peer->state = Active; + peer->state = Connect; 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 Connect\n", peer->name); + return 1; + } + + peer->state = Active; + peer->state_time = time_now; + peer->retry_time = peer->retry_count = 0; - return bgp_send_open(peer); + LOG(4, 0, 0, "BGP peer %s: state Active\n", inet_ntoa(addr.sin_addr)); + + 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, 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 (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 (peer->inbuf->done < len) + return 0; - log(4, 0, 0, 0, "Received %s from BGP peer %s\n", - bgp_msg_type_str(p->header.type), peer->name); + LOG(4, 0, 0, "Received %s from BGP peer %s\n", + bgp_msg_type_str(p->header.type), peer->name); - switch (p->header.type) + switch (p->header.type) + { + case BGP_MSG_OPEN: { - case BGP_MSG_OPEN: - { - 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 */ - } + struct bgp_data_open data; + int hold; + int i; - break; - - case BGP_MSG_KEEPALIVE: - if (peer->state == OpenConfirm) + for (i = 0; i < sizeof(p->header.marker); i++) + { + if ((unsigned char) p->header.marker[i] != 0xff) { - 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(4, 0, 0, 0, "BGP peer %s: state Established\n", peer->name); - } + LOG(1, 0, 0, "Invalid marker from BGP peer %s\n", + peer->name); - break; + bgp_send_notification(peer, BGP_ERR_HEADER, + BGP_ERR_HDR_NOT_SYNC); - case BGP_MSG_NOTIFICATION: - if (len > sizeof(p->header)) - { - 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); + return 0; } + } - 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)); + if (peer->state != OpenSent) + { + LOG(1, 0, 0, "OPEN from BGP peer %s in %s state\n", + peer->name, bgp_state_str(peer->state)); - peer->outbuf->packet.header.type = BGP_MSG_OPEN; - - data.version = BGP_VERSION; - data.as = htons(our_as); - data.hold_time = htons(BGP_HOLD_TIME); - data.identifier = my_address; - data.opt_len = 0; + bgp_send_notification(peer, BGP_ERR_FSM, 0); + return 0; + } - memcpy(peer->outbuf->packet.data, &data, BGP_DATA_OPEN_SIZE); - len += BGP_DATA_OPEN_SIZE; + memcpy(&data, p->data, len - sizeof(p->header)); - peer->outbuf->packet.header.len = htons(len); - peer->outbuf->done = 0; - peer->next_state = OpenSent; + if (data.version != BGP_VERSION) + { + LOG(1, 0, 0, "Bad version (%d) sent by BGP peer %s\n", + (int) data.version, peer->name); - 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)); - - peer->outbuf->packet.header.type = BGP_MSG_KEEPALIVE; - peer->outbuf->packet.header.len = - htons(sizeof(peer->outbuf->packet.header)); + bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_OPN_VERSION); + return 0; + } - peer->outbuf->done = 0; - peer->next_state = (peer->state == OpenSent) ? OpenConfirm : peer->state; + 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); - return bgp_write(peer); -} + bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_OPN_BAD_AS); + return 0; + } -/* 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; + if ((hold = ntohs(data.hold_time)) < 3) + { + LOG(1, 0, 0, "Bad hold time (%d) from BGP peer %s\n", + hold, peer->name); - char *data = (char *) &peer->outbuf->packet.data; + bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_OPN_HOLD_TIME); + return 0; + } - /* 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); + /* pick lowest hold time */ + if (hold < peer->hold) + peer->hold = hold; - /* skip over unf_len */ - data += sizeof(unf_len); - len += sizeof(unf_len); + /* adjust our keepalive based on negotiated hold value */ + if (peer->keepalive * 3 > peer->hold) + peer->keepalive = peer->hold / 3; - memset(peer->outbuf->packet.header.marker, 0xff, - sizeof(peer->outbuf->packet.header.marker)); + /* next transition requires an exchange of keepalives */ + bgp_send_keepalive(peer); - peer->outbuf->packet.header.type = BGP_MSG_UPDATE; + /* FIXME: may need to check for optional params */ + } - peer->update_routes = 0; /* tentatively clear */ + break; - /* find differences */ - while ((have || want) && data < (max - sizeof(struct bgp_ip_prefix))) + case BGP_MSG_KEEPALIVE: + if (peer->state == OpenConfirm) { - 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; - - 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); - - 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; - } - } + 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); } - if (have || want) - peer->update_routes = 1; /* more to do */ + break; - /* 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) + case BGP_MSG_NOTIFICATION: + if (len > sizeof(p->header)) { - if (!(e = malloc(sizeof(*e)))) - { - log(0, 0, 0, 0, "Can't allocate route for %s/%d (%s)\n", - inet_toa(add->dest.prefix), add->dest.len, strerror(errno)); + struct bgp_data_notification *notification = + (struct bgp_data_notification *) p->data; - return 0; - } - - 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); + if (notification->error_code == BGP_ERR_CEASE) + { + LOG(4, 0, 0, "BGP peer %s sent CEASE\n", peer->name); + bgp_restart(peer); + return 0; + } - memcpy(data, peer->path_attrs, peer->path_attr_len); - data += peer->path_attr_len; - len += peer->path_attr_len; + /* FIXME: should handle more notifications */ + LOG(4, 0, 0, "BGP peer %s sent unhandled NOTIFICATION %d\n", + peer->name, (int) notification->error_code); + } - s = BGP_IP_PREFIX_SIZE(add->dest); - memcpy(data, &add->dest, s); - data += s; - len += s; + break; + } - log(5, 0, 0, 0, "Advertising route %s/%d to BGP peer %s\n", - inet_toa(add->dest.prefix), add->dest.len, peer->name); - } - else - { - attr_len = 0; - memcpy(data, &attr_len, sizeof(attr_len)); - data += sizeof(attr_len); - len += sizeof(attr_len); - } + /* reset timer */ + peer->expire_time = time_now + peer->hold; - peer->outbuf->packet.header.len = htons(len); - peer->outbuf->done = 0; + /* 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 bgp_write(peer); + return peer->inbuf->done; } -/* send/buffer NOTIFICATION message */ -static int bgp_send_notification(struct bgp_peer *peer, u8 code, u8 subcode) +/* send/buffer OPEN message */ +static int bgp_send_open(struct bgp_peer *peer) { - struct bgp_data_notification data; - u16 len = 0; + struct bgp_data_open data; + uint16_t len = sizeof(peer->outbuf->packet.header); - data.error_code = code; - len += sizeof(data.error_code); + memset(peer->outbuf->packet.header.marker, 0xff, + sizeof(peer->outbuf->packet.header.marker)); - data.error_subcode = subcode; - len += sizeof(data.error_code); + peer->outbuf->packet.header.type = BGP_MSG_OPEN; - memset(peer->outbuf->packet.header.marker, 0xff, - sizeof(peer->outbuf->packet.header.marker)); + data.version = BGP_VERSION; + data.as = htons(our_as); + data.hold_time = htons(peer->hold); + data.identifier = my_address; + data.opt_len = 0; - peer->outbuf->packet.header.type = BGP_MSG_NOTIFICATION; - peer->outbuf->packet.header.len = - htons(sizeof(peer->outbuf->packet.header) + len); + memcpy(peer->outbuf->packet.data, &data, BGP_DATA_OPEN_SIZE); + len += BGP_DATA_OPEN_SIZE; - memcpy(peer->outbuf->packet.data, &data, len); + peer->outbuf->packet.header.len = htons(len); + peer->outbuf->done = 0; + peer->next_state = OpenSent; - peer->outbuf->done = 0; - peer->next_state = code == BGP_ERR_CEASE ? Disabled : Idle; + return bgp_write(peer); +} - /* we're dying; ignore any pending input */ - peer->inbuf->packet.header.len = 0; - peer->inbuf->done = 0; +/* 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)); - return bgp_write(peer); -} + peer->outbuf->packet.header.type = BGP_MSG_KEEPALIVE; + peer->outbuf->packet.header.len = + htons(sizeof(peer->outbuf->packet.header)); -/* CLI stuff */ + peer->outbuf->done = 0; + peer->next_state = (peer->state == OpenSent) ? OpenConfirm : peer->state; -#include + return bgp_write(peer); +} -int cmd_show_bgp(struct cli_def *cli, char *command, char **argv, int argc) +/* send/buffer UPDATE message */ +static int bgp_send_update(struct bgp_peer *peer) { - int i; - int hdr = 0; - char *addr; + 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; - if (!bgp_configured) - return CLI_OK; + if (s < 0) /* found one to delete */ + { + struct bgp_route_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; + unf_len += s; + 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", + fmtaddr(tmp->dest.prefix, 0), 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->routes = 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_routes = 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; -} - -int cmd_suspend_bgp(struct cli_def *cli, char *command, char **argv, int argc) -{ - int i; - char *addr; + if (have || want) + peer->update_routes = 1; /* more to do */ - if (!bgp_configured) - return CLI_OK; + /* anything changed? */ + if (!(unf_len || add)) + return 1; - if (CLI_HELP_REQUESTED) - return cli_arg_help(cli, 1, - "A.B.C.D", "BGP peer address", - "NAME", "BGP peer name", - NULL); + /* go back and insert unf_len */ + unf_len = htons(unf_len); + memcpy(&peer->outbuf->packet.data, &unf_len, sizeof(unf_len)); - for (i = 0; i < BGP_NUM_PEERS; i++) + if (add) + { + if (!(e = malloc(sizeof(*e)))) { - if (bgp_peers[i].state != Established) - continue; - - if (!bgp_peers[i].routing) - continue; - - addr = inet_toa(bgp_peers[i].addr); - if (argc && strcmp(addr, argv[0]) && strcmp(bgp_peers[i].name, argv[0])) - continue; + LOG(0, 0, 0, "Can't allocate route for %s/%d (%s)\n", + fmtaddr(add->dest.prefix, 0), add->dest.len, strerror(errno)); - 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->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); } -int cmd_no_suspend_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; - - 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); - - for (i = 0; i < BGP_NUM_PEERS; i++) - { - if (bgp_peers[i].state != Established) - continue; + struct bgp_data_notification data; + uint16_t len = 0; - if (bgp_peers[i].routing) - continue; + data.error_code = code; + len += sizeof(data.error_code); - addr = inet_toa(bgp_peers[i].addr); - if (argc && strcmp(addr, argv[0]) && - strncmp(bgp_peers[i].name, argv[0], strlen(argv[0]))) - continue; + data.error_subcode = subcode; + len += sizeof(data.error_code); - bgp_peers[i].cli_flag = BGP_CLI_ENABLE; - cli_print(cli, "Un-suspending peer %s", bgp_peers[i].name); - } + memset(peer->outbuf->packet.header.marker, 0xff, + sizeof(peer->outbuf->packet.header.marker)); - return CLI_OK; -} - -int cmd_restart_bgp(struct cli_def *cli, char *command, char **argv, int argc) -{ - int i; - char *addr; + peer->outbuf->packet.header.type = BGP_MSG_NOTIFICATION; + peer->outbuf->packet.header.len = + htons(sizeof(peer->outbuf->packet.header) + len); - if (!bgp_configured) - return CLI_OK; + memcpy(peer->outbuf->packet.data, &data, len); - if (CLI_HELP_REQUESTED) - return cli_arg_help(cli, 1, - "A.B.C.D", "BGP peer address", - "NAME", "BGP peer name", - NULL); + peer->outbuf->done = 0; + peer->next_state = code == BGP_ERR_CEASE ? Disabled : Idle; - for (i = 0; i < BGP_NUM_PEERS; i++) - { - 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; - - bgp_peers[i].cli_flag = BGP_CLI_RESTART; - cli_print(cli, "Restarting peer %s", bgp_peers[i].name); - } + /* we're dying; ignore any pending input */ + peer->inbuf->packet.header.len = 0; + peer->inbuf->done = 0; - return CLI_OK; + return bgp_write(peer); }