* 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 <stdlib.h>
#include <unistd.h>
#include <string.h>
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);
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 */
*/
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 <sys/epoll.h>
+#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 <libcli.h>
+ 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);
}
projects / l2tpns.git / blobdiff