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Merge branch 'fdn-mods'

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This commit is contained in:
Benjamin Cama 2011-07-29 14:54:00 +02:00
commit 08b8dffa78
7 changed files with 742 additions and 45 deletions
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566
bgp.c
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@ -32,8 +32,11 @@ 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);
static struct bgp_route6_list *bgp_insert_route6(struct bgp_route6_list *head,
struct bgp_route6_list *new);
static void bgp_free_routes(struct bgp_route_list *routes);
static void bgp_free_routes6(struct bgp_route6_list *routes);
static char const *bgp_msg_type_str(uint8_t type);
static int bgp_connect(struct bgp_peer *peer);
static int bgp_handle_connect(struct bgp_peer *peer);
@ -43,11 +46,13 @@ 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_update6(struct bgp_peer *peer);
static int bgp_send_notification(struct bgp_peer *peer, uint8_t code,
uint8_t subcode);
static uint16_t our_as;
static struct bgp_route_list *bgp_routes = 0;
static struct bgp_route6_list *bgp_routes6 = 0;
int bgp_configured = 0;
struct bgp_peer *bgp_peers = 0;
@ -88,6 +93,7 @@ int bgp_setup(int as)
return 0;
bgp_routes = 0;
bgp_routes6 = 0;
bgp_configured = 0; /* set by bgp_start */
return 1;
@ -95,7 +101,7 @@ int bgp_setup(int as)
/* start connection with a peer */
int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive,
int hold, int enable)
int hold, struct in_addr update_source, int enable)
{
struct hostent *h;
int ibgp;
@ -124,6 +130,7 @@ int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive,
}
memcpy(&peer->addr, h->h_addr, sizeof(peer->addr));
peer->source_addr = update_source.s_addr;
peer->as = as > 0 ? as : our_as;
ibgp = peer->as == our_as;
@ -191,15 +198,6 @@ int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive,
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;
@ -229,6 +227,25 @@ int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive,
ADD_ATTRIBUTE();
/* remember the len before adding NEXT_HOP */
peer->path_attr_len_without_nexthop = peer->path_attr_len;
/* NEXT_HOP */
a.flags = BGP_PATH_ATTR_FLAG_TRANS;
a.code = BGP_PATH_ATTR_CODE_NEXT_HOP;
if (config->nexthop_address)
{
ip = config->nexthop_address;
}
else
{
ip = my_address; /* we're it */
}
a.data.s.len = sizeof(ip);
memcpy(a.data.s.value, &ip, sizeof(ip));
ADD_ATTRIBUTE();
if (!(peer->path_attrs = malloc(peer->path_attr_len)))
{
LOG(0, 0, 0, "Can't allocate path_attrs for %s (%s)\n",
@ -239,6 +256,53 @@ int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive,
memcpy(peer->path_attrs, path_attrs, peer->path_attr_len);
/* multiprotocol attributes initialization */
if (config->ipv6_prefix.s6_addr[0])
{
struct bgp_attr_mp_reach_nlri_partial mp_reach_nlri_partial;
struct bgp_attr_mp_unreach_nlri_partial mp_unreach_nlri_partial;
a.flags = BGP_PATH_ATTR_FLAG_OPTIONAL;
a.code = BGP_PATH_ATTR_CODE_MP_REACH_NLRI;
a.data.s.len = 0; /* will be set on UPDATE */
mp_reach_nlri_partial.afi = htons(BGP_MP_AFI_IPv6);
mp_reach_nlri_partial.safi = BGP_MP_SAFI_UNICAST;
mp_reach_nlri_partial.reserved = 0;
mp_reach_nlri_partial.next_hop_len = 16;
/* use the defined nexthop6, or our address in ipv6_prefix */
if (config->nexthop6_address.s6_addr[0])
memcpy(&mp_reach_nlri_partial.next_hop,
&config->nexthop6_address.s6_addr, 16);
else
{
/* our address is ipv6prefix::1 */
memcpy(&mp_reach_nlri_partial.next_hop,
&config->ipv6_prefix.s6_addr, 16);
mp_reach_nlri_partial.next_hop[15] = 1;
}
memcpy(&a.data.s.value, &mp_reach_nlri_partial,
sizeof(struct bgp_attr_mp_reach_nlri_partial));
memcpy(&peer->mp_reach_nlri_partial, &a,
BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE);
a.flags = BGP_PATH_ATTR_FLAG_OPTIONAL | BGP_PATH_ATTR_FLAG_EXTLEN;
a.code = BGP_PATH_ATTR_CODE_MP_UNREACH_NLRI;
a.data.e.len = 0; /* will be set on UPDATE */
mp_unreach_nlri_partial.afi = htons(BGP_MP_AFI_IPv6);
mp_unreach_nlri_partial.safi = BGP_MP_SAFI_UNICAST;
memcpy(&a.data.e.value, &mp_unreach_nlri_partial,
sizeof(struct bgp_attr_mp_unreach_nlri_partial));
memcpy(&peer->mp_unreach_nlri_partial, &a,
BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE);
}
peer->mp_handling = HandlingUnknown;
LOG(4, 0, 0, "Initiating BGP connection to %s (routing %s)\n",
name, enable ? "enabled" : "suspended");
@ -267,6 +331,8 @@ static void bgp_clear(struct bgp_peer *peer)
bgp_free_routes(peer->routes);
peer->routes = 0;
bgp_free_routes6(peer->routes6);
peer->routes6 = 0;
peer->outbuf->packet.header.len = 0;
peer->outbuf->done = 0;
@ -374,6 +440,33 @@ static struct bgp_route_list *bgp_insert_route(struct bgp_route_list *head,
return head;
}
/* insert route6 into list; sorted */
static struct bgp_route6_list *bgp_insert_route6(struct bgp_route6_list *head,
struct bgp_route6_list *new)
{
struct bgp_route6_list *p = head;
struct bgp_route6_list *e = 0;
while (p && memcmp(&p->dest, &new->dest, sizeof(p->dest)) < 0)
{
e = p;
p = p->next;
}
if (e)
{
new->next = e->next;
e->next = new;
}
else
{
new->next = head;
head = new;
}
return head;
}
/* add route to list for peers */
/*
* Note: this doesn't do route aggregation, nor drop routes if a less
@ -426,6 +519,59 @@ int bgp_add_route(in_addr_t ip, in_addr_t mask)
return 1;
}
/* add route to list for peers */
/*
* Note: same provisions as above
*/
int bgp_add_route6(struct in6_addr ip, int prefixlen)
{
struct bgp_route6_list *r = bgp_routes6;
struct bgp_route6_list add;
int i;
char ipv6addr[INET6_ADDRSTRLEN];
memcpy(&add.dest.prefix, &ip.s6_addr, 16);
add.dest.len = prefixlen;
add.next = 0;
/* check for duplicate */
while (r)
{
i = memcmp(&r->dest, &add.dest, sizeof(r->dest));
if (!i)
return 1; /* already covered */
if (i > 0)
break;
r = r->next;
}
/* insert into route list; sorted */
if (!(r = malloc(sizeof(*r))))
{
LOG(0, 0, 0, "Can't allocate route for %s/%d (%s)\n",
inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN), add.dest.len,
strerror(errno));
return 0;
}
memcpy(r, &add, sizeof(*r));
bgp_routes6 = bgp_insert_route6(bgp_routes6, r);
/* flag established peers for update */
for (i = 0; i < BGP_NUM_PEERS; i++)
if (bgp_peers[i].state == Established
&& bgp_peers[i].mp_handling == HandleIPv6Routes)
bgp_peers[i].update_routes6 = 1;
LOG(4, 0, 0, "Registered BGP route %s/%d\n",
inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN), add.dest.len);
return 1;
}
/* remove route from list for peers */
int bgp_del_route(in_addr_t ip, in_addr_t mask)
{
@ -475,6 +621,58 @@ int bgp_del_route(in_addr_t ip, in_addr_t mask)
return 1;
}
/* remove route from list for peers */
int bgp_del_route6(struct in6_addr ip, int prefixlen)
{
struct bgp_route6_list *r = bgp_routes6;
struct bgp_route6_list *e = 0;
struct bgp_route6_list del;
int i;
char ipv6addr[INET6_ADDRSTRLEN];
memcpy(&del.dest.prefix, &ip.s6_addr, 16);
del.dest.len = prefixlen;
del.next = 0;
/* find entry in routes list and remove */
while (r)
{
i = memcmp(&r->dest, &del.dest, sizeof(r->dest));
if (!i)
{
if (e)
e->next = r->next;
else
bgp_routes6 = r->next;
free(r);
break;
}
e = r;
if (i > 0)
r = 0; /* stop */
else
r = r->next;
}
/* not found */
if (!r)
return 1;
/* flag established peers for update */
for (i = 0; i < BGP_NUM_PEERS; i++)
if (bgp_peers[i].state == Established
&& bgp_peers[i].mp_handling == HandleIPv6Routes)
bgp_peers[i].update_routes6 = 1;
LOG(4, 0, 0, "Removed BGP route %s/%d\n",
inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN), del.dest.len);
return 1;
}
/* enable or disable routing */
void bgp_enable_routing(int enable)
{
@ -619,6 +817,14 @@ int bgp_process(uint32_t events[])
continue;
}
/* process pending IPv6 updates */
if (peer->update_routes6
&& !peer->outbuf->packet.header.len) /* ditto */
{
if (!bgp_send_update6(peer))
continue;
}
/* process timers */
if (peer->state == Established)
{
@ -662,6 +868,17 @@ static void bgp_free_routes(struct bgp_route_list *routes)
}
}
static void bgp_free_routes6(struct bgp_route6_list *routes)
{
struct bgp_route6_list *tmp;
while ((tmp = routes))
{
routes = tmp->next;
free(tmp);
}
}
char const *bgp_state_str(enum bgp_state state)
{
switch (state)
@ -696,6 +913,7 @@ static int bgp_connect(struct bgp_peer *peer)
{
static int bgp_port = 0;
struct sockaddr_in addr;
struct sockaddr_in source_addr;
struct epoll_event ev;
if (!bgp_port)
@ -727,6 +945,19 @@ static int bgp_connect(struct bgp_peer *peer)
/* set to non-blocking */
fcntl(peer->sock, F_SETFL, fcntl(peer->sock, F_GETFL, 0) | O_NONBLOCK);
/* set source address */
memset(&source_addr, 0, sizeof(source_addr));
source_addr.sin_family = AF_INET;
source_addr.sin_addr.s_addr = peer->source_addr; /* defaults to INADDR_ANY */
if (bind(peer->sock, (struct sockaddr *) &source_addr, sizeof(source_addr)) < 0)
{
LOG(1, 0, 0, "Can't set source address to %s: %s\n",
inet_ntoa(source_addr.sin_addr), strerror(errno));
bgp_set_retry(peer);
return 0;
}
/* try connect */
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
@ -902,6 +1133,12 @@ static int bgp_handle_input(struct bgp_peer *peer)
struct bgp_data_open data;
int hold;
int i;
off_t param_offset, capability_offset;
struct bgp_opt_param *param;
uint8_t capabilities_len;
char *capabilities = NULL;
struct bgp_capability *capability;
struct bgp_mp_cap_param *mp_cap;
for (i = 0; i < sizeof(p->header.marker); i++)
{
@ -964,10 +1201,93 @@ static int bgp_handle_input(struct bgp_peer *peer)
if (peer->keepalive * 3 > peer->hold)
peer->keepalive = peer->hold / 3;
/* check for optional parameters */
/* 2 is for the size of type + len (both uint8_t) */
for (param_offset = 0;
param_offset < data.opt_len;
param_offset += 2 + param->len)
{
param = (struct bgp_opt_param *)((char *)&data.opt_params + param_offset);
/* sensible check */
if (data.opt_len - param_offset < 2
|| param->len > data.opt_len - param_offset - 2)
{
LOG(1, 0, 0, "Malformed Optional Parameter list from BGP peer %s\n",
peer->name);
bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_UNSPEC);
return 0;
}
/* we know only one parameter type */
if (param->type != BGP_PARAM_TYPE_CAPABILITY)
{
LOG(1, 0, 0, "Unsupported Optional Parameter type %d from BGP peer %s\n",
param->type, peer->name);
bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_OPN_UNSUP_PARAM);
return 0;
}
capabilities_len = param->len;
capabilities = (char *)&param->value;
/* look for BGP multiprotocol capability */
for (capability_offset = 0;
capability_offset < capabilities_len;
capability_offset += 2 + capability->len)
{
capability = (struct bgp_capability *)(capabilities + capability_offset);
/* sensible check */
if (capabilities_len - capability_offset < 2
|| capability->len > capabilities_len - capability_offset - 2)
{
LOG(1, 0, 0, "Malformed Capabilities list from BGP peer %s\n",
peer->name);
bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_UNSPEC);
return 0;
}
/* we only know one capability code */
if (capability->code != BGP_CAP_CODE_MP
&& capability->len != sizeof(struct bgp_mp_cap_param))
{
LOG(4, 0, 0, "Unsupported Capability code %d from BGP peer %s\n",
capability->code, peer->name);
/* we don't terminate, still; we just jump to the next one */
continue;
}
mp_cap = (struct bgp_mp_cap_param *)&capability->value;
/* the only <AFI, SAFI> tuple we support */
if (ntohs(mp_cap->afi) != BGP_MP_AFI_IPv6 && mp_cap->safi != BGP_MP_SAFI_UNICAST)
{
LOG(4, 0, 0, "Unsupported multiprotocol AFI %d and SAFI %d from BGP peer %s\n",
mp_cap->afi, mp_cap->safi, peer->name);
/* we don't terminate, still; we just jump to the next one */
continue;
}
/* yes it can! */
peer->mp_handling = HandleIPv6Routes;
}
}
if (peer->mp_handling != HandleIPv6Routes)
{
peer->mp_handling = DoesntHandleIPv6Routes;
if (config->ipv6_prefix.s6_addr[0])
LOG(1, 0, 0, "Warning: BGP peer %s doesn't handle IPv6 prefixes updates\n",
peer->name);
}
/* next transition requires an exchange of keepalives */
bgp_send_keepalive(peer);
/* FIXME: may need to check for optional params */
}
break;
@ -996,10 +1316,30 @@ static int bgp_handle_input(struct bgp_peer *peer)
if (notification->error_code == BGP_ERR_CEASE)
{
LOG(4, 0, 0, "BGP peer %s sent CEASE\n", peer->name);
bgp_restart(peer);
bgp_set_retry(peer);
return 0;
}
if (notification->error_code == BGP_ERR_OPEN
&& notification->error_subcode == BGP_ERR_OPN_UNSUP_PARAM)
{
LOG(4, 0, 0, "BGP peer %s doesn't support BGP Capabilities\n", peer->name);
peer->mp_handling = DoesntHandleIPv6Routes;
bgp_set_retry(peer);
return 0;
}
if (notification->error_code == BGP_ERR_OPEN
&& notification->error_subcode == BGP_ERR_OPN_UNSUP_CAP)
{
/* the only capability we advertise is this one, so upon receiving
an "unsupported capability" message, we disable IPv6 routes for
this peer */
LOG(4, 0, 0, "BGP peer %s doesn't support IPv6 routes advertisement\n", peer->name);
peer->mp_handling = DoesntHandleIPv6Routes;
break;
}
/* FIXME: should handle more notifications */
LOG(4, 0, 0, "BGP peer %s sent unhandled NOTIFICATION %d\n",
peer->name, (int) notification->error_code);
@ -1030,6 +1370,9 @@ static int bgp_handle_input(struct bgp_peer *peer)
static int bgp_send_open(struct bgp_peer *peer)
{
struct bgp_data_open data;
struct bgp_mp_cap_param mp_ipv6 = { htons(BGP_MP_AFI_IPv6), 0, BGP_MP_SAFI_UNICAST };
struct bgp_capability cap_mp_ipv6;
struct bgp_opt_param param_cap_mp_ipv6;
uint16_t len = sizeof(peer->outbuf->packet.header);
memset(peer->outbuf->packet.header.marker, 0xff,
@ -1041,10 +1384,30 @@ static int bgp_send_open(struct bgp_peer *peer)
data.as = htons(our_as);
data.hold_time = htons(peer->hold);
data.identifier = my_address;
/* if we know peer doesn't support MP (mp_handling == DoesntHandleIPv6Routes)
then don't add this parameter */
if (config->ipv6_prefix.s6_addr[0]
&& (peer->mp_handling == HandlingUnknown
|| peer->mp_handling == HandleIPv6Routes))
{
/* construct the param and capability */
cap_mp_ipv6.code = BGP_CAP_CODE_MP;
cap_mp_ipv6.len = sizeof(mp_ipv6);
memcpy(&cap_mp_ipv6.value, &mp_ipv6, cap_mp_ipv6.len);
param_cap_mp_ipv6.type = BGP_PARAM_TYPE_CAPABILITY;
param_cap_mp_ipv6.len = 2 + sizeof(mp_ipv6);
memcpy(&param_cap_mp_ipv6.value, &cap_mp_ipv6, param_cap_mp_ipv6.len);
data.opt_len = 2 + param_cap_mp_ipv6.len;
memcpy(&data.opt_params, &param_cap_mp_ipv6, data.opt_len);
}
else
data.opt_len = 0;
memcpy(peer->outbuf->packet.data, &data, BGP_DATA_OPEN_SIZE);
len += BGP_DATA_OPEN_SIZE;
memcpy(peer->outbuf->packet.data, &data, BGP_DATA_OPEN_SIZE + data.opt_len);
len += BGP_DATA_OPEN_SIZE + data.opt_len;
peer->outbuf->packet.header.len = htons(len);
peer->outbuf->done = 0;
@ -1211,6 +1574,179 @@ static int bgp_send_update(struct bgp_peer *peer)
return bgp_write(peer);
}
/* send/buffer UPDATE message for IPv6 routes */
static int bgp_send_update6(struct bgp_peer *peer)
{
uint16_t attr_len;
uint16_t unreach_len = 0;
char *unreach_len_pos;
uint8_t reach_len;
uint16_t len = sizeof(peer->outbuf->packet.header);
struct bgp_route6_list *have = peer->routes6;
struct bgp_route6_list *want = peer->routing ? bgp_routes6 : 0;
struct bgp_route6_list *e = 0;
struct bgp_route6_list *add = 0;
int s;
char ipv6addr[INET6_ADDRSTRLEN];
char *data = (char *) &peer->outbuf->packet.data;
/* need leave room for attr_len, bgp_path_attrs and one prefix */
char *max = (char *) &peer->outbuf->packet.data
+ sizeof(peer->outbuf->packet.data)
- sizeof(attr_len) - peer->path_attr_len_without_nexthop
- BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE - sizeof(struct bgp_ip6_prefix);
memset(peer->outbuf->packet.header.marker, 0xff,
sizeof(peer->outbuf->packet.header.marker));
peer->outbuf->packet.header.type = BGP_MSG_UPDATE;
/* insert non-MP unfeasible routes length */
memcpy(data, &unreach_len, sizeof(unreach_len));
/* skip over it and attr_len too; it will be filled when known */
data += sizeof(unreach_len) + sizeof(attr_len);
len += sizeof(unreach_len) + sizeof(attr_len);
/* copy usual attributes */
memcpy(data, peer->path_attrs, peer->path_attr_len_without_nexthop);
data += peer->path_attr_len_without_nexthop;
attr_len = peer->path_attr_len_without_nexthop;
/* copy MP unreachable NLRI heading */
memcpy(data, peer->mp_unreach_nlri_partial,
BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE);
/* remember where to update this attr len */
unreach_len_pos = data + 2;
data += BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE;
attr_len += BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE;
peer->update_routes6 = 0; /* tentatively clear */
/* find differences */
while ((have || want) && data < (max - sizeof(struct bgp_ip6_prefix)))
{
if (have)
s = want
? memcmp(&have->dest, &want->dest, sizeof(have->dest))
: -1;
else
s = 1;
if (s < 0) /* found one to delete */
{
struct bgp_route6_list *tmp = have;
have = have->next;
s = BGP_IP_PREFIX_SIZE(tmp->dest);
memcpy(data, &tmp->dest, s);
data += s;
unreach_len += s;
attr_len += s;
LOG(5, 0, 0, "Withdrawing route %s/%d from BGP peer %s\n",
inet_ntop(AF_INET6, &tmp->dest.prefix, ipv6addr, INET6_ADDRSTRLEN),
tmp->dest.len, peer->name);
free(tmp);
if (e)
e->next = have;
else
peer->routes6 = 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_routes6 = 1; /* only one add per packet */
if (!have)
break;
}
else
add = want;
if (want)
want = want->next;
}
}
}
if (have || want)
peer->update_routes6 = 1; /* more to do */
/* anything changed? */
if (!(unreach_len || add))
return 1;
if (unreach_len)
{
/* go back and insert MP unreach_len */
unreach_len += sizeof(struct bgp_attr_mp_unreach_nlri_partial);
unreach_len = htons(unreach_len);
memcpy(unreach_len_pos, &unreach_len, sizeof(unreach_len));
}
else
{
/* we can remove this attribute, then */
data -= BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE;
attr_len -= BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE;
}
if (add)
{
if (!(e = malloc(sizeof(*e))))
{
LOG(0, 0, 0, "Can't allocate route for %s/%d (%s)\n",
inet_ntop(AF_INET6, &add->dest.prefix, ipv6addr, INET6_ADDRSTRLEN),
add->dest.len, strerror(errno));
return 0;
}
memcpy(e, add, sizeof(*e));
e->next = 0;
peer->routes6 = bgp_insert_route6(peer->routes6, e);
/* copy MP reachable NLRI heading */
memcpy(data, peer->mp_reach_nlri_partial,
BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE);
/* with proper len */
reach_len = BGP_IP_PREFIX_SIZE(add->dest);
data[2] = sizeof(struct bgp_attr_mp_reach_nlri_partial) + reach_len;
data += BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE;
attr_len += BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE;
memcpy(data, &add->dest, reach_len);
data += reach_len;
attr_len += reach_len;
LOG(5, 0, 0, "Advertising route %s/%d to BGP peer %s\n",
inet_ntop(AF_INET6, &add->dest.prefix, ipv6addr, INET6_ADDRSTRLEN),
add->dest.len, peer->name);
}
/* update len with attributes we added */
len += attr_len;
/* go back and insert attr_len */
attr_len = htons(attr_len);
memcpy((char *)&peer->outbuf->packet.data + 2, &attr_len, sizeof(attr_len));
peer->outbuf->packet.header.len = htons(len);
peer->outbuf->done = 0;
return bgp_write(peer);
}
/* send/buffer NOTIFICATION message */
static int bgp_send_notification(struct bgp_peer *peer, uint8_t code,
uint8_t subcode)

84
bgp.h
View file

@ -43,11 +43,51 @@ struct bgp_data_open {
char opt_params[sizeof(((struct bgp_packet *)0)->data) - BGP_DATA_OPEN_SIZE]; /* variable */
} __attribute__ ((packed));
struct bgp_opt_param {
uint8_t type;
uint8_t len;
#define BGP_MAX_OPT_PARAM_SIZE 256
char value[BGP_MAX_OPT_PARAM_SIZE];
} __attribute__ ((packed));
#define BGP_PARAM_TYPE_CAPABILITY 2
struct bgp_capability {
uint8_t code;
uint8_t len;
#define BGP_MAX_CAPABILITY_SIZE 256
char value[BGP_MAX_CAPABILITY_SIZE];
} __attribute__ ((packed));
/* RFC4760 Multiprotocol extension */
#define BGP_CAP_CODE_MP 1
struct bgp_mp_cap_param {
uint16_t afi; /* sa_family_t */
uint8_t reserved; /* SHOULD be 0 */
uint8_t safi;
} __attribute__ ((packed));
/* bgp_mp_cap_param.afi */
#define BGP_MP_AFI_RESERVED 0
#define BGP_MP_AFI_IPv4 1
#define BGP_MP_AFI_IPv6 2
/* bgp_mp_cap_param.safi */
#define BGP_MP_SAFI_UNICAST 1
#define BGP_MP_SAFI_MULTICAST 2
struct bgp_ip6_prefix {
uint8_t len;
uint8_t prefix[16]; /* variable */
} __attribute__ ((packed));
/* end of RFC4760 specific definitions */
struct bgp_ip_prefix {
uint8_t len;
uint32_t prefix; /* variable */
} __attribute__ ((packed));
/* works for both IPv4 and IPv6 prefixes */
#define BGP_IP_PREFIX_SIZE(p) (1 + ((p).len / 8) + ((p).len % 8 != 0))
struct bgp_path_attr {
@ -65,6 +105,22 @@ struct bgp_path_attr {
} data; /* variable */
} __attribute__ ((packed));
struct bgp_attr_mp_reach_nlri_partial {
uint16_t afi; /* sa_family_t */
uint8_t safi;
uint8_t next_hop_len;
uint8_t next_hop[16];
uint8_t reserved;
} __attribute__ ((packed));
#define BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE (3 + sizeof(struct bgp_attr_mp_reach_nlri_partial))
struct bgp_attr_mp_unreach_nlri_partial {
uint16_t afi; /* sa_family_t */
uint8_t safi;
} __attribute__ ((packed));
/* we use it as an extended attribute */
#define BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE (4 + sizeof(struct bgp_attr_mp_unreach_nlri_partial))
/* bgp_path_attr.flags (bitfields) */
#define BGP_PATH_ATTR_FLAG_OPTIONAL (1 << 7)
#define BGP_PATH_ATTR_FLAG_TRANS (1 << 6)
@ -85,9 +141,11 @@ struct bgp_path_attr {
#define BGP_PATH_ATTR_CODE_ATOMIC_AGGREGATE 6 /* well-known, discretionary */
#define BGP_PATH_ATTR_CODE_AGGREGATOR 7 /* optional, transitive */
#define BGP_PATH_ATTR_CODE_COMMUNITIES 8 /* optional, transitive (RFC1997) */
#define BGP_PATH_ATTR_CODE_MP_REACH_NLRI 14 /* optional, non-transitive (RFC4760) */
#define BGP_PATH_ATTR_CODE_MP_UNREACH_NLRI 15 /* optional, non-transitive (RFC4760) */
#define BGP_PATH_ATTR_SIZE(p) ((((p).flags & BGP_PATH_ATTR_FLAG_EXTLEN) \
? ((p).data.e.len + 1) : (p).data.s.len) + 3)
? ((p).data.e.len + 4) : (p).data.s.len) + 3)
/* well known COMMUNITIES */
#define BGP_COMMUNITY_NO_EXPORT 0xffffff01 /* don't advertise outside confederation */
@ -101,6 +159,7 @@ struct bgp_data_notification {
} __attribute__ ((packed));
/* bgp_data_notification.error_code, .error_subcode */
#define BGP_ERR_UNSPEC 0
#define BGP_ERR_HEADER 1
# define BGP_ERR_HDR_NOT_SYNC 1
# define BGP_ERR_HDR_BAD_LEN 2
@ -112,6 +171,7 @@ struct bgp_data_notification {
# define BGP_ERR_OPN_UNSUP_PARAM 4
# define BGP_ERR_OPN_AUTH_FAILURE 5
# define BGP_ERR_OPN_HOLD_TIME 6
# define BGP_ERR_OPN_UNSUP_CAP 7
#define BGP_ERR_UPDATE 3
# define BGP_ERR_UPD_BAD_ATTR_LIST 1
# define BGP_ERR_UPD_UNKN_WK_ATTR 2
@ -138,6 +198,11 @@ enum bgp_state {
Established, /* established */
};
struct bgp_route6_list {
struct bgp_ip6_prefix dest;
struct bgp_route6_list *next;
};
struct bgp_route_list {
struct bgp_ip_prefix dest;
struct bgp_route_list *next;
@ -148,10 +213,17 @@ struct bgp_buf {
size_t done; /* bytes sent/recvd */
};
enum bgp_mp_handling {
HandleIPv6Routes,
DoesntHandleIPv6Routes,
HandlingUnknown,
};
/* state */
struct bgp_peer {
char name[32]; /* peer name */
in_addr_t addr; /* peer address */
in_addr_t source_addr; /* our source address */
int as; /* AS number */
int sock;
enum bgp_state state; /* FSM state */
@ -173,8 +245,14 @@ struct bgp_peer {
int cli_flag; /* updates requested from CLI */
char *path_attrs; /* path attrs to send in UPDATE message */
int path_attr_len; /* length of path attrs */
int path_attr_len_without_nexthop; /* length of path attrs without NEXT_HOP */
uint32_t events; /* events to poll */
struct event_data edata; /* poll data */
enum bgp_mp_handling mp_handling; /* how it handles IPv6 routes advertisements */
int update_routes6; /* UPDATE required for IPv6 routes */
struct bgp_route6_list *routes6; /* IPv6 routes known by this peer */
char mp_reach_nlri_partial[BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE];
char mp_unreach_nlri_partial[BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE];
};
/* bgp_peer.cli_flag */
@ -188,13 +266,15 @@ extern int bgp_configured;
/* actions */
int bgp_setup(int as);
int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive,
int hold, int enable);
int hold, struct in_addr update_source, int enable);
void bgp_stop(struct bgp_peer *peer);
void bgp_halt(struct bgp_peer *peer);
int bgp_restart(struct bgp_peer *peer);
int bgp_add_route(in_addr_t ip, in_addr_t mask);
int bgp_add_route6(struct in6_addr ip, int prefixlen);
int bgp_del_route(in_addr_t ip, in_addr_t mask);
int bgp_del_route6(struct in6_addr ip, int prefixlen);
void bgp_enable_routing(int enable);
int bgp_set_poll(void);
int bgp_process(uint32_t events[]);

51
cli.c
View file

@ -283,6 +283,7 @@ void init_cli(char *hostname)
fcntl(clifd, F_SETFL, flags | O_NONBLOCK);
}
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = config->cli_bind_address; /* defaults to INADDR_ANY */
addr.sin_port = htons(23);
if (bind(clifd, (void *) &addr, sizeof(addr)) < 0)
{
@ -443,6 +444,14 @@ static int cmd_show_session(struct cli_def *cli, char *command, char **argv, int
if (session[s].idle_timeout)
cli_print(cli, "\tIdle Timeout:\t%u seconds", session[s].idle_timeout - (session[s].last_data ? abs(time_now - session[s].last_data) : 0));
if (session[s].timeout)
{
cli_print(cli, "\tRemaining time:\t%u",
(session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
? (unsigned) (session[s].timeout - bundle[session[s].bundle].online_time)
: (unsigned) (session[s].timeout - (time_now - session[s].opened)));
}
cli_print(cli, "\tBytes In/Out:\t%u/%u", session[s].cout, session[s].cin);
cli_print(cli, "\tPkts In/Out:\t%u/%u", session[s].pout, session[s].pin);
cli_print(cli, "\tMRU:\t\t%d", session[s].mru);
@ -510,7 +519,7 @@ static int cmd_show_session(struct cli_def *cli, char *command, char **argv, int
}
// Show Summary
cli_print(cli, "%5s %4s %-32s %-15s %s %s %s %s %10s %10s %10s %4s %-15s %s",
cli_print(cli, "%5s %4s %-32s %-15s %s %s %s %s %10s %10s %10s %4s %10s %-15s %s",
"SID",
"TID",
"Username",
@ -523,13 +532,20 @@ static int cmd_show_session(struct cli_def *cli, char *command, char **argv, int
"downloaded",
"uploaded",
"idle",
"Rem.Time",
"LAC",
"CLI");
for (i = 1; i < MAXSESSION; i++)
{
uint32_t rem_time;
if (!session[i].opened) continue;
cli_print(cli, "%5d %4d %-32s %-15s %s %s %s %s %10u %10lu %10lu %4u %-15s %s",
if (session[i].bundle && bundle[session[i].bundle].num_of_links > 1)
rem_time = session[i].timeout ? (session[i].timeout - bundle[session[i].bundle].online_time) : 0;
else
rem_time = session[i].timeout ? (session[i].timeout - (time_now-session[i].opened)) : 0;
cli_print(cli, "%5d %4d %-32s %-15s %s %s %s %s %10u %10lu %10lu %4u %10lu %-15s %s",
i,
session[i].tunnel,
session[i].user[0] ? session[i].user : "*",
@ -542,6 +558,7 @@ static int cmd_show_session(struct cli_def *cli, char *command, char **argv, int
(unsigned long)session[i].cout,
(unsigned long)session[i].cin,
abs(time_now - (session[i].last_packet ? session[i].last_packet : time_now)),
(unsigned long)(rem_time),
fmtaddr(htonl(tunnel[ session[i].tunnel ].ip), 1),
session[i].calling[0] ? session[i].calling : "*");
}
@ -1022,6 +1039,11 @@ static int cmd_show_run(struct cli_def *cli, char *command, char **argv, int arg
h = BGP_HOLD_TIME;
cli_print(cli, " neighbour %s timers %d %d", config->neighbour[i].name, k, h);
if (config->neighbour[i].update_source.s_addr != INADDR_ANY)
cli_print(cli, " neighbour %s update-source %s",
config->neighbour[i].name,
inet_ntoa(config->neighbour[i].update_source));
}
}
#endif
@ -2048,6 +2070,7 @@ static int cmd_router_bgp_neighbour(struct cli_def *cli, char *command, char **a
return cli_arg_help(cli, 0,
"remote-as", "Set remote autonomous system number",
"timers", "Set timers",
"update-source", "Set source address to use for the BGP session",
NULL);
default:
@ -2066,6 +2089,9 @@ static int cmd_router_bgp_neighbour(struct cli_def *cli, char *command, char **a
return cli_arg_help(cli, 1, NULL);
}
if (MATCH("update-source", argv[1]))
return cli_arg_help(cli, argc > 3, "A.B.C.D", "Source IP address", NULL);
return CLI_OK;
}
}
@ -2102,12 +2128,33 @@ static int cmd_router_bgp_neighbour(struct cli_def *cli, char *command, char **a
snprintf(config->neighbour[i].name, sizeof(config->neighbour[i].name), "%s", argv[0]);
config->neighbour[i].keepalive = -1;
config->neighbour[i].hold = -1;
config->neighbour[i].update_source.s_addr = INADDR_ANY;
}
config->neighbour[i].as = as;
return CLI_OK;
}
if (MATCH("update-source", argv[1]))
{
struct in_addr addr;
if (!config->neighbour[i].name[0])
{
cli_error(cli, "Specify remote-as first");
return CLI_OK;
}
if (!inet_aton(argv[2], &addr))
{
cli_error(cli, "Cannot parse IP \"%s\"", argv[2]);
return CLI_OK;
}
config->neighbour[i].update_source = addr;
return CLI_OK;
}
if (argc != 4 || !MATCH("timers", argv[1]))
{
cli_error(cli, "Invalid arguments");

10
etc/startup-config.default
View file

@ -7,6 +7,9 @@ set log_file "/var/log/l2tpns"
# Write pid to this file
set pid_file "/var/run/l2tpns.pid"
# This host name, if different from the OS one
#set hostname "localhost"
# Shared secret with LAC
set l2tp_secret "secret"
@ -53,6 +56,9 @@ set accounting_dir "/var/run/l2tpns/acct"
# Listen address for L2TP
#set bind_address 1.1.1.1
# Listen address for CLI
#set cli_bind_address 127.0.0.1
# Send a gratiuitous ARP for bind address
#set send_garp no
@ -102,6 +108,10 @@ set accounting_dir "/var/run/l2tpns/acct"
# IPv6 address prefix
#set ipv6_prefix ::
# BGP NEXT_HOP path attribute
#set nexthop 10.0.1.1
#set nexthop6 2001:db8::1
# Drop/kill sessions
#load plugin "sessionctl"

32
l2tpns.c
View file

@ -69,7 +69,7 @@ int rand_fd = -1; // Random data source
int cluster_sockfd = -1; // Intra-cluster communications socket.
int epollfd = -1; // event polling
time_t basetime = 0; // base clock
char hostname[1000] = ""; // us.
char hostname[MAXHOSTNAME] = ""; // us.
static int tunidx; // ifr_ifindex of tun device
static int syslog_log = 0; // are we logging to syslog
static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
@ -157,6 +157,10 @@ config_descriptt config_values[] = {
CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
CONFIG("cli_bind_address", cli_bind_address, IPv4),
CONFIG("hostname", hostname, STRING),
CONFIG("nexthop_address", nexthop_address, IPv4),
CONFIG("nexthop6_address", nexthop6_address, IPv6),
{ NULL, 0, 0, 0 },
};
@ -164,8 +168,6 @@ static char *plugin_functions[] = {
NULL,
"plugin_pre_auth",
"plugin_post_auth",
"plugin_packet_rx",
"plugin_packet_tx",
"plugin_timer",
"plugin_new_session",
"plugin_kill_session",
@ -501,7 +503,12 @@ void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
strerror(errno));
// FIXME: need to add BGP routing (RFC2858)
#ifdef BGP
if (add)
bgp_add_route6(ip, prefixlen);
else
bgp_del_route6(ip, prefixlen);
#endif /* BGP */
if (s)
{
@ -3397,8 +3404,6 @@ static int still_busy(void)
static clockt last_talked = 0;
static clockt start_busy_wait = 0;
if (!config->cluster_iam_master)
{
#ifdef BGP
static time_t stopped_bgp = 0;
if (bgp_configured)
@ -3413,19 +3418,22 @@ static int still_busy(void)
stopped_bgp = time_now;
if (!config->cluster_iam_master)
{
// we don't want to become master
cluster_send_ping(0);
return 1;
}
}
if (time_now < (stopped_bgp + QUIT_DELAY))
if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
return 1;
}
#endif /* BGP */
if (!config->cluster_iam_master)
return 0;
}
if (main_quit == QUIT_SHUTDOWN)
{
@ -3566,7 +3574,8 @@ static void mainloop(void)
if (config->neighbour[i].name[0])
bgp_start(&bgp_peers[i], config->neighbour[i].name,
config->neighbour[i].as, config->neighbour[i].keepalive,
config->neighbour[i].hold, 0); /* 0 = routing disabled */
config->neighbour[i].hold, config->neighbour[i].update_source,
0); /* 0 = routing disabled */
}
#endif /* BGP */
@ -4066,11 +4075,16 @@ static void initdata(int optdebug, char *optconfig)
}
if (!*hostname)
{
if (!*config->hostname)
{
// Grab my hostname unless it's been specified
gethostname(hostname, sizeof(hostname));
stripdomain(hostname);
}
else
strcpy(hostname, config->hostname);
}
_statistics->start_time = _statistics->last_reset = time(NULL);

6
l2tpns.h
View file

@ -38,6 +38,7 @@
#define PPPoE_MRU 1492 // maximum PPPoE MRU (rfc2516: 1500 less PPPoE header (6) and PPP protocol ID (2))
#define MAXETHER (MAXMTU+18) // max packet we try sending to tun
#define MAXTEL 96 // telephone number
#define MAXHOSTNAME 256 // hostname
#define MAXUSER 128 // username
#define MAXPASS 128 // password
#define MAXPLUGINS 20 // maximum number of plugins to load
@ -712,6 +713,8 @@ typedef struct
int cluster_master_min_adv; // Master advertises routes while the number of up to date
// slaves is less than this value.
in_addr_t cli_bind_address; // bind address for CLI
char hostname[MAXHOSTNAME]; // hostname (overridden by -h on command line)
// Guest change
char guest_user[MAXUSER]; // Guest account username
@ -723,7 +726,10 @@ typedef struct
uint16_t as;
int keepalive;
int hold;
struct in_addr update_source;
} neighbour[BGP_NUM_PEERS];
in_addr_t nexthop_address;
struct in6_addr nexthop6_address;
#endif
} configt;

4
ppp.c
View file

@ -821,6 +821,10 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
break;
case Closing:
sessionshutdown(s, "LCP: ConfigReq in state Closing. This should not happen. Killing session.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
break;
default:
LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp));
return;