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Multihop BGP was completely broken, because listening socket has always

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ttl 1.
This commit is contained in:
Ondrej Zajicek 2008-11-01 16:58:40 +01:00
parent a92fe60717
commit a39b165e45
3 changed files with 58 additions and 20 deletions
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1
lib/socket.h
View File

@ -48,6 +48,7 @@ int sk_send(sock *, unsigned len); /* Send data, <0=err, >0=ok, 0=sleep */
int sk_send_to(sock *, unsigned len, ip_addr to, unsigned port); /* sk_send to given destination */
void sk_reallocate(sock *); /* Free and allocate tbuf & rbuf */
void sk_dump_all(void);
int sk_set_ttl(sock *s, int ttl); /* Set TTL for given socket */
int sk_set_md5_auth(sock *s, ip_addr a, char *passwd); /* Add or remove security associations for given passive socket */
static inline int

14
proto/bgp/bgp.c
View File

@ -298,11 +298,7 @@ static void
bgp_setup_sk(struct bgp_proto *p, struct bgp_conn *conn, sock *s)
{
s->data = conn;
s->ttl = p->cf->multihop ? : 1;
s->rbsize = BGP_RX_BUFFER_SIZE;
s->tbsize = BGP_TX_BUFFER_SIZE;
s->err_hook = bgp_sock_err;
s->tos = IP_PREC_INTERNET_CONTROL;
conn->sk = s;
}
@ -330,11 +326,15 @@ bgp_connect(struct bgp_proto *p) /* Enter Connect state and start establishing c
s->saddr = p->local_addr;
s->daddr = p->cf->remote_ip;
s->dport = BGP_PORT;
s->ttl = p->cf->multihop ? : 1;
s->rbsize = BGP_RX_BUFFER_SIZE;
s->tbsize = BGP_TX_BUFFER_SIZE;
s->tos = IP_PREC_INTERNET_CONTROL;
s->password = p->cf->password;
s->tx_hook = bgp_connected;
BGP_TRACE(D_EVENTS, "Connecting to %I from local address %I", s->daddr, s->saddr);
bgp_setup_conn(p, conn);
bgp_setup_sk(p, conn, s);
s->tx_hook = bgp_connected;
s->password = p->cf->password;
conn->state = BS_CONNECT;
if (sk_open(s))
{
@ -399,6 +399,7 @@ bgp_incoming_connection(sock *sk, int dummy UNUSED)
}
bgp_setup_conn(p, &p->incoming_conn);
bgp_setup_sk(p, &p->incoming_conn, sk);
sk_set_ttl(sk, p->cf->multihop ? : 1);
bgp_send_open(&p->incoming_conn);
return 0;
}
@ -420,7 +421,6 @@ bgp_setup_listen_sk(void)
s->type = SK_TCP_PASSIVE;
s->sport = BGP_PORT;
s->tos = IP_PREC_INTERNET_CONTROL;
s->ttl = 1;
s->rbsize = BGP_RX_BUFFER_SIZE;
s->tbsize = BGP_TX_BUFFER_SIZE;
s->rx_hook = bgp_incoming_connection;

61
sysdep/unix/io.c
View File

@ -610,6 +610,25 @@ get_sockaddr(struct sockaddr_in *sa, ip_addr *a, unsigned *port, int check)
#endif
static char *
sk_set_ttl_int(sock *s)
{
int one = 1;
#ifdef IPV6
if (s->type != SK_UDP_MC && s->type != SK_IP_MC &&
setsockopt(fd, SOL_IPV6, IPV6_UNICAST_HOPS, &s->ttl, sizeof(s->ttl)) < 0)
return "IPV6_UNICAST_HOPS";
#else
if (setsockopt(s->fd, SOL_IP, IP_TTL, &s->ttl, sizeof(s->ttl)) < 0)
return "IP_TTL";
#ifdef CONFIG_UNIX_DONTROUTE
if (s->ttl == 1 && setsockopt(s->fd, SOL_SOCKET, SO_DONTROUTE, &one, sizeof(one)) < 0)
return "SO_DONTROUTE";
#endif
#endif
return NULL;
}
#define ERR(x) do { err = x; goto bad; } while(0)
#define WARN(x) log(L_WARN "sk_setup: %s: %m", x)
@ -617,32 +636,50 @@ static char *
sk_setup(sock *s)
{
int fd = s->fd;
int one = 1;
char *err;
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
ERR("fcntl(O_NONBLOCK)");
if (s->type == SK_UNIX)
return NULL;
#ifdef IPV6
if (s->ttl >= 0 && s->type != SK_UDP_MC && s->type != SK_IP_MC &&
setsockopt(fd, SOL_IPV6, IPV6_UNICAST_HOPS, &s->ttl, sizeof(s->ttl)) < 0)
ERR("IPV6_UNICAST_HOPS");
#else
#ifndef IPV6
if ((s->tos >= 0) && setsockopt(fd, SOL_IP, IP_TOS, &s->tos, sizeof(s->tos)) < 0)
WARN("IP_TOS");
if (s->ttl >= 0 && setsockopt(fd, SOL_IP, IP_TTL, &s->ttl, sizeof(s->ttl)) < 0)
ERR("IP_TTL");
#ifdef CONFIG_UNIX_DONTROUTE
if (s->ttl == 1 && setsockopt(fd, SOL_SOCKET, SO_DONTROUTE, &one, sizeof(one)) < 0)
ERR("SO_DONTROUTE");
#endif
#endif
if (s->ttl >= 0)
err = sk_set_ttl_int(s);
else
err = NULL;
bad:
return err;
}
/**
* sk_set_ttl - set TTL for given socket.
* @s: socket
* @ttl: TTL value
*
* Set TTL for already opened connections when TTL was not set before.
* Useful for accepted connections when different ones should have
* different TTL.
*
* Result: 0 for success, -1 for an error.
*/
int
sk_set_ttl(sock *s, int ttl)
{
char *err;
s->ttl = ttl;
if (err = sk_set_ttl_int(s))
log(L_ERR "sk_set_ttl: %s: %m", err);
return (err ? -1 : 0);
}
/* FIXME: check portability */