Re: routing bug?

A follow up to the post below on stable.  We tried the same program on 
OpenBSD, and it does the same thing as RELENG_4.  However, HEAD as of 
yesterday and 5.2.1 do not show the same behaviour as RELENG_4.  Does this 
ring a bell with anyone ?  Ideally, we would like to see the same behaviour 
on RELENG_4 as it causes major grief for us with raccoon when dynamic 
interfaces come and go.


         ---Mike

At 09:59 AM 07/05/2004, Gabor wrote:
>I am experiencing some weird routing phenomena.
>When I open a UDP socket and send datagrams to an address(172.30.1.1)
>and then remove that route(route delete 172.30.1.1) then my packets
>switch from going out the route specific interface(rl0) to going out
>the default interface(fxp0).  This is as expected.  Then I add back
>the route (route add 172.30.1.1 10.0.2.2) and the packets swing back
>to the route specific interface(rl0).  However, if I bind my socket to
>a source address(172.16.24.33), when I remove the route and then add
>it back, the packets continue to go out the default interface(fxp0)
>instead of going out the route specific interface(rl0).
>
>This is on 4.9 STABLE.  I was unable to reproduce this on 5.2.1.  What
>changes have there been that haven't been MFC'ed?
>
>=0= udp-test # netstat -nr
>Routing tables
>
>Internet:
>Destination        Gateway            Flags    Refs      Use  Netif Expire
>default            192.168.43.1       UGSc        2     2440   fxp0
>10.0.2/24          link#1             UC          2        0    rl0
>10.0.2.1           00:50:fc:32:52:a7  UHLW        0        2    lo0
>10.0.2.2           00:0e:0c:05:09:19  UHLW        1        3    rl0     69
>172.0.0.1          172.0.0.1          UH          0        0    lo0
>172.30.1.1         10.0.2.2           UGHS        0        0    rl0
>192.168.7          link#1             UC          0        0    rl0
>192.168.43         link#2             UC          4        0   fxp0
>192.168.43.1       00:50:bf:33:63:70  UHLW        4    56111   fxp0   1079
>192.168.43.31      link#2             UHLW        1      249   fxp0
>192.168.43.157     00:a0:c9:4b:a5:f4  UHLW        6  2168880   fxp0    771
>192.168.43.242     link#2             UHLW        1   718878   fxp0
>
>=0= udp-test # ifconfig
>rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 192.168.7.2 netmask 0xffffff00 broadcast 192.168.7.255
>         inet 10.0.2.1 netmask 0xffffff00 broadcast 10.0.2.255
>         ether 00:50:fc:32:52:a7
>         media: Ethernet 10baseT/UTP
>         status: active
>fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 192.168.43.26 netmask 0xffffff00 broadcast 192.168.43.255
>         ether 00:01:80:3d:b4:4f
>         media: Ethernet autoselect (100baseTX <full-duplex>)
>         status: active
>ppp0: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
>faith0: flags=8002<BROADCAST,MULTICAST> mtu 1500
>ds0: flags=8008<LOOPBACK,MULTICAST> mtu 65532
>lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
>         inet 172.16.24.33 netmask 0xffff0000
>         inet 172.0.0.1 netmask 0xffff0000
>tun0: flags=8010<POINTOPOINT,MULTICAST> mtu 1500
>
>=0= udp-test # cat udp-test.c
>#include <sys/types.h>
>#include <sys/time.h>
>#include <sys/socket.h>
>#include <netinet/in.h>
>#include <netdb.h>
>#include <unistd.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <string.h>
>#include <ctype.h>
>
>int send_pkt(unsigned char *src, unsigned char *dest, unsigned short port);
>
>int
>main(int argc, char **argv)
>{
>     unsigned a, b, c, d, a2, b2, c2, d2;
>     unsigned port;
>     unsigned char src[4], dest[4];
>
>
>     if (argc != 3) {
>         fprintf(stderr,
>                 "Usage: %s <source> <dest>:<port>\n",
>                 argv[0]);
>         return 1;
>     }
>
>     if (sscanf(argv[1], "%u.%u.%u.%u", &a, &b, &c, &d) == 4
>             && a < 256 && b < 256 && c < 256 && d < 256
>             && sscanf(argv[2], "%u.%u.%u.%u:%u", &a2, &b2, &c2, &d2, 
> &port) == 5
>             && a2 < 256 && b2 < 256 && c2 < 256 && d2 < 256 && port < 
> 65536) {
>         /* OK */
>         src[0]  = a;
>         src[1]  = b;
>         src[2]  = c;
>         src[3]  = d;
>         dest[0] = a2;
>         dest[1] = b2;
>         dest[2] = c2;
>         dest[3] = d2;
>         send_pkt(src, dest, port);
>     }
>     else {
>         fprintf(stderr,
>                 "Usage: %s <source> <dest>:<port>\n",
>                 argv[0]);
>         return 1;
>     }
>
>     return 0;
>}
>
>int
>send_pkt(unsigned char *src, unsigned char *dest, unsigned short port)
>{
>     int s, len, cnt, rc, on;
>     struct protoent *proto;
>     struct sockaddr_in to, from;
>     char data[1024];
>
>     if (!(proto = getprotobyname("udp"))) {
>         perror("getprotobyname");
>         return -1;
>     }
>
>     if ((s = socket(PF_INET, SOCK_DGRAM, proto->p_proto)) < 0) {
>         perror("socket");
>         return -1;
>     }
>     on = 1;
>
>     memset(&from, 0, sizeof from);
>     from.sin_family = AF_INET;
>     from.sin_port = htons(0);
>     memcpy(&from.sin_addr.s_addr, src, 4);
>     fprintf(stderr,
>             "bind:%d\n",
>             bind(s, (struct sockaddr*)&from, sizeof from));
>
>     memset(&to, 0, sizeof to);
>     to.sin_family = AF_INET;
>     to.sin_port = htons(port);
>     memcpy(&to.sin_addr.s_addr, dest, 4);
>     len = 58;
>     cnt = 0;
>     while (1) {
>         memset(data, cnt, len);
>         rc = sendto(s, data, len, 0, (struct sockaddr*)&to, sizeof to);
>         if (rc < 0)
>             perror("");
>         fprintf(stderr, "%d %d\n", rc, cnt);
>         sleep(5);
>         ++cnt;
>     }
>     close(s);
>
>     return 0;
>}
>
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