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2004-01-23 sowmini.varadhan@sun.com

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* rip_interface.c: obsolete unbind code in
        rip_interface_multicast_set, and instead do the more portable
        (though slower) method of creating a socket for each outgoing packet
        and binding the source address on the new socket.
        * rip_interface.c, ripd.c, ripd.h: Modify rip_request_send so that
        source address is determined by the caller of rip_request_send for
        ripv1 packets and non-multicast interfaces (rip_request_send loops
        over all connected address in all other cases).
        * rip_send_packet: don't send packets with source set to
        ZEBRA_IFA_SECONDARY connected addresses; improved debug messages;
This commit is contained in:
paul 2004-01-23 15:31:42 +00:00
parent c15cfa8329
commit 931cd54d52
4 changed files with 129 additions and 40 deletions
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13
ripd/ChangeLog
View file

@ -1,3 +1,16 @@
2004-01-23 sowmini.varadhan@sun.com
* rip_interface.c: obsolete unbind code in
rip_interface_multicast_set, and instead do the more portable
(though slower) method of creating a socket for each outgoing packet
and binding the source address on the new socket.
* rip_interface.c, ripd.c, ripd.h: Modify rip_request_send so that
source address is determined by the caller of rip_request_send for
ripv1 packets and non-multicast interfaces (rip_request_send loops
over all connected address in all other cases).
* rip_send_packet: don't send packets with source set to
ZEBRA_IFA_SECONDARY connected addresses; improved debug messages;
2003-06-07 Andrew J. Schorr <aschorr@telemetry-investments.com>
* Allow ripd to receive RIPv1

22
ripd/rip_interface.c
View file

@ -146,16 +146,20 @@ rip_interface_multicast_set (int sock, struct connected *connected,
struct in_addr addr;
struct prefix_ipv4 *p;
if (connected != NULL)
{
if (if_pointopoint)
p = (struct prefix_ipv4 *) connected->destination;
else
p = (struct prefix_ipv4 *) connected->address;
addr = p->prefix;
}
else
{
addr.s_addr = INADDR_ANY;
}
if (setsockopt_multicast_ipv4 (sock, IP_MULTICAST_IF,
addr, 0, 0) < 0)
if (setsockopt_multicast_ipv4 (sock, IP_MULTICAST_IF, addr, 0, 0) < 0)
{
zlog_warn ("Can't setsockopt IP_MULTICAST_IF to fd %d", sock);
return;
@ -171,8 +175,9 @@ rip_interface_multicast_set (int sock, struct connected *connected,
else
from.sin_port = htons (RIP_PORT_DEFAULT);
/* Address shoud be any address. */
/* Address should be any address. */
from.sin_family = AF_INET;
if (connected)
addr = ((struct prefix_ipv4 *) connected->address)->prefix;
from.sin_addr = addr;
#ifdef HAVE_SIN_LEN
@ -182,7 +187,6 @@ rip_interface_multicast_set (int sock, struct connected *connected,
if (ripd_privs.change (ZPRIVS_RAISE))
zlog_err ("rip_interface_multicast_set: could not raise privs");
bind (sock, NULL, 0); /* unbind any previous association */
ret = bind (sock, (struct sockaddr *) & from, sizeof (struct sockaddr_in));
if (ret < 0)
{
@ -209,7 +213,7 @@ rip_request_interface_send (struct interface *ifp, u_char version)
if (IS_RIP_DEBUG_EVENT)
zlog_info ("multicast request on %s", ifp->name);
rip_request_send (NULL, ifp, version);
rip_request_send (NULL, ifp, version, NULL);
return;
}
@ -238,7 +242,7 @@ rip_request_interface_send (struct interface *ifp, u_char version)
if (IS_RIP_DEBUG_EVENT)
zlog_info ("SEND request to %s", inet_ntoa (to.sin_addr));
rip_request_send (&to, ifp, version);
rip_request_send (&to, ifp, version, connected);
}
}
}
@ -284,7 +288,7 @@ rip_request_neighbor (struct in_addr addr)
to.sin_port = htons (RIP_PORT_DEFAULT);
to.sin_addr = addr;
rip_request_send (&to, NULL, rip->version_send);
rip_request_send (&to, NULL, rip->version_send, NULL);
}
/* Request routes at all interfaces. */

131
ripd/ripd.c
View file

@ -61,7 +61,7 @@ void rip_event (enum rip_event, int);
void rip_output_process (struct interface *, struct prefix *,
struct sockaddr_in *, int, u_char,
struct prefix_ipv4 *);
struct connected *, struct prefix_ipv4 *);
/* RIP output routes type. */
enum
@ -1235,11 +1235,44 @@ rip_response_process (struct rip_packet *packet, int size,
/* RIP packet send to destination address. */
int
rip_send_packet (caddr_t buf, int size, struct sockaddr_in *to,
struct interface *ifp)
struct interface *ifp, struct connected *connected)
{
int ret;
int ret, send_sock;
struct sockaddr_in sin;
if (IS_RIP_DEBUG_PACKET)
{
char dst[20];
if (to)
{
strcpy(dst, inet_ntoa(to->sin_addr));
}
else
{
sin.sin_addr.s_addr = htonl (INADDR_RIP_GROUP);
strcpy(dst, inet_ntoa(sin.sin_addr));
}
zlog_info("rip_send_packet %s > %s (%s)",
inet_ntoa(connected->address->u.prefix4), dst, ifp->name);
}
if (connected->flags & ZEBRA_IFA_SECONDARY)
{
/*
* ZEBRA_IFA_SECONDARY is set on linux when an interface is configured
* with multiple addresses on the same subnet: the first address
* on the subnet is configured "primary", and all subsequent addresses
* on that subnet are treated as "secondary" addresses.
* In order to avoid routing-table bloat on other rip listeners,
* we do not send out RIP packets with ZEBRA_IFA_SECONDARY source addrs.
* XXX Since Linux is the only system for which the ZEBRA_IFA_SECONDARY
* flag is set, we would end up sending a packet for a "secondary"
* source address on non-linux systems.
*/
if (IS_RIP_DEBUG_PACKET)
zlog_info("duplicate dropped");
return 0;
}
/* Make destination address. */
memset (&sin, 0, sizeof (struct sockaddr_in));
sin.sin_family = AF_INET;
@ -1252,6 +1285,7 @@ rip_send_packet (caddr_t buf, int size, struct sockaddr_in *to,
{
sin.sin_port = to->sin_port;
sin.sin_addr = to->sin_addr;
send_sock = rip->sock;
}
else
{
@ -1259,11 +1293,28 @@ rip_send_packet (caddr_t buf, int size, struct sockaddr_in *to,
sin.sin_port = htons (RIP_PORT_DEFAULT);
sin.sin_addr.s_addr = htonl (INADDR_RIP_GROUP);
/* caller has set multicast interface */
/*
* we have to open a new socket for each packet because this
* is the most portable way to bind to a different source
* ipv4 address for each packet.
*/
send_sock = socket(AF_INET, SOCK_DGRAM, 0);
if (send_sock < 0)
{
zlog_warn("rip_send_packet could not create socket %s",
strerror(errno));
return -1;
}
sockopt_broadcast (send_sock);
sockopt_reuseaddr (send_sock);
sockopt_reuseport (send_sock);
#ifdef RIP_RECVMSG
setsockopt_pktinfo (send_sock);
#endif /* RIP_RECVMSG */
rip_interface_multicast_set(send_sock, connected, if_is_pointopoint(ifp));
}
ret = sendto (rip->sock, buf, size, 0, (struct sockaddr *)&sin,
ret = sendto (send_sock, buf, size, 0, (struct sockaddr *)&sin,
sizeof (struct sockaddr_in));
if (IS_RIP_DEBUG_EVENT)
@ -1273,6 +1324,9 @@ rip_send_packet (caddr_t buf, int size, struct sockaddr_in *to,
if (ret < 0)
zlog_warn ("can't send packet : %s", strerror (errno));
if (!to)
close(send_sock);
return ret;
}
@ -1456,7 +1510,7 @@ rip_request_process (struct rip_packet *packet, int size,
/* All route with split horizon */
rip_output_process (ifp, NULL, from, rip_all_route, packet->version,
&saddr);
NULL, &saddr);
}
else
{
@ -1488,7 +1542,7 @@ rip_request_process (struct rip_packet *packet, int size,
}
packet->command = RIP_RESPONSE;
rip_send_packet ((caddr_t) packet, size, from, ifp);
rip_send_packet ((caddr_t) packet, size, from, ifp, NULL);
}
rip_global_queries++;
}
@ -1983,7 +2037,7 @@ rip_write_rte (int num, struct stream *s, struct prefix_ipv4 *p,
void
rip_output_process (struct interface *ifp, struct prefix *ifaddr,
struct sockaddr_in *to, int route_type, u_char version,
struct prefix_ipv4 *saddr)
struct connected *connected, struct prefix_ipv4 *saddr)
{
int ret;
struct stream *s;
@ -2243,7 +2297,7 @@ rip_output_process (struct interface *ifp, struct prefix *ifaddr,
rip_auth_md5_set (s, ifp);
ret = rip_send_packet (STREAM_DATA (s), stream_get_endp (s),
to, ifp);
to, ifp, connected);
if (ret >= 0 && IS_RIP_DEBUG_SEND)
rip_packet_dump ((struct rip_packet *)STREAM_DATA (s),
@ -2259,7 +2313,8 @@ rip_output_process (struct interface *ifp, struct prefix *ifaddr,
if (version == RIPv2 && ri->auth_type == RIP_AUTH_MD5)
rip_auth_md5_set (s, ifp);
ret = rip_send_packet (STREAM_DATA (s), stream_get_endp (s), to, ifp);
ret = rip_send_packet (STREAM_DATA (s), stream_get_endp (s), to, ifp,
connected);
if (ret >= 0 && IS_RIP_DEBUG_SEND)
rip_packet_dump ((struct rip_packet *)STREAM_DATA (s),
@ -2275,12 +2330,13 @@ rip_output_process (struct interface *ifp, struct prefix *ifaddr,
/* Send RIP packet to the interface. */
void
rip_update_interface (struct interface *ifp, u_char version, int route_type,
struct prefix_ipv4 *saddr)
struct connected *sconn)
{
struct prefix_ipv4 *p;
struct connected *connected;
listnode node;
struct sockaddr_in to;
struct prefix_ipv4 *saddr = (struct prefix_ipv4 *) sconn->address;
/* When RIP version is 2 and multicast enable interface. */
if (version == RIPv2 && if_is_multicast (ifp))
@ -2289,7 +2345,7 @@ rip_update_interface (struct interface *ifp, u_char version, int route_type,
zlog_info ("multicast announce on %s ", ifp->name);
rip_output_process (ifp, NULL, NULL, route_type, rip->version_send,
saddr);
sconn, saddr);
return;
}
@ -2317,7 +2373,7 @@ rip_update_interface (struct interface *ifp, u_char version, int route_type,
inet_ntoa (to.sin_addr), ifp->name);
rip_output_process (ifp, connected->address, &to, route_type,
rip->version_send, saddr);
rip->version_send, connected, saddr);
}
}
}
@ -2371,10 +2427,11 @@ rip_update_process (int route_type)
LIST_LOOP(ifp->connected, connected, ifnode)
{
struct prefix_ipv4 *ifaddr;
/* If there is no version configuration in the interface,
use rip's version setting. */
int done = 0;
/*
* If there is no version configuration in the interface,
* use rip's version setting.
*/
int vsend = ((ri->ri_send == RI_RIP_UNSPEC) ?
rip->version_send : ri->ri_send);
@ -2383,12 +2440,14 @@ rip_update_process (int route_type)
if (ifaddr->family != AF_INET)
continue;
rip_interface_multicast_set(rip->sock, connected,
if_is_pointopoint(ifp));
if (vsend & RIPv1)
rip_update_interface (ifp, RIPv1, route_type, ifaddr);
if (vsend & RIPv2)
rip_update_interface (ifp, RIPv2, route_type, ifaddr);
if ((vsend & RIPv1) && !done)
rip_update_interface (ifp, RIPv1, route_type, connected);
if ((vsend & RIPv2) && if_is_multicast(ifp))
rip_update_interface (ifp, RIPv2, route_type, connected);
done = 1;
if (!(vsend & RIPv2) || !if_is_multicast(ifp))
break;
}
}
}
@ -2413,7 +2472,8 @@ rip_update_process (int route_type)
to.sin_port = htons (RIP_PORT_DEFAULT);
/* RIP version is rip's configuration. */
rip_output_process (ifp, NULL, &to, route_type, rip->version_send, p);
rip_output_process (ifp, NULL, &to, route_type, rip->version_send,
NULL, p);
}
}
@ -2589,12 +2649,11 @@ rip_create ()
/* Sned RIP request to the destination. */
int
rip_request_send (struct sockaddr_in *to, struct interface *ifp,
u_char version)
u_char version, struct connected *connected)
{
struct rte *rte;
struct rip_packet rip_packet;
listnode node;
struct connected *connected;
memset (&rip_packet, 0, sizeof (rip_packet));
@ -2603,6 +2662,20 @@ rip_request_send (struct sockaddr_in *to, struct interface *ifp,
rte = rip_packet.rte;
rte->metric = htonl (RIP_METRIC_INFINITY);
if (connected)
{
/*
* connected is only sent for ripv1 case, or when
* interface does not support multicast. Caller loops
* over each connected address for this case.
*/
if (rip_send_packet ((caddr_t) &rip_packet, sizeof (rip_packet),
to, ifp, connected) != sizeof (rip_packet))
return -1;
else
return sizeof (rip_packet);
}
/* send request on each connected network */
LIST_LOOP(ifp->connected, connected, node)
{
@ -2613,10 +2686,8 @@ rip_request_send (struct sockaddr_in *to, struct interface *ifp,
if (p->family != AF_INET)
continue;
rip_interface_multicast_set(rip->sock, connected,
if_is_pointopoint(ifp));
if (rip_send_packet ((caddr_t) &rip_packet, sizeof (rip_packet),
to, ifp) != sizeof (rip_packet))
to, ifp, connected) != sizeof (rip_packet))
return -1;
}
return sizeof (rip_packet);

3
ripd/ripd.h
View file

@ -377,7 +377,8 @@ void rip_offset_init ();
int if_check_address (struct in_addr addr);
int if_valid_neighbor (struct in_addr addr);
int rip_request_send (struct sockaddr_in *, struct interface *, u_char);
int rip_request_send (struct sockaddr_in *, struct interface *, u_char,
struct connected *);
int rip_neighbor_lookup (struct sockaddr_in *);
void rip_redistribute_add (int, int, struct prefix_ipv4 *, unsigned int,
struct in_addr *);