Date: Fri, 07 May 2004 15:13:13 -0400 From: Mike Tancsa <mike@sentex.net> To: freebsd-current@freebsd.org Subject: Re: routing bug? Message-ID: <6.0.3.0.0.20040507151017.08816e60@64.7.153.2>
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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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