On Fri, May 07, 2004 at 11:12:53PM +0200, Andre Oppermann wrote: > Mike Tancsa wrote: ... > I hope this explains the effect you are seeing. A backport or MFC of > the protocol cloning removal is not possible and is a rather extensive > change to the network stack which is outside of the RELENG_4 scope. actually my student Alessandro Cerri did just that, though I am not sure if there is interest in committing it... It all depends on what's the expected lifetime of 4.x and whether 5.x gets "up to speed" reasonably... cheers luigi > There is one easy hack you can do for UDP sockets. That is you simply > RTFREE() the rtentry pointed to by the inpcb early on in udp_output() > just to let a new one be reaquired later on. If it is NULL the code > will simply redo the routing table lookup and store a new pointer the > rtentry. With this every time you send a UDP packet you'll get the > corret route. A little bit more extensive hack would simply avoid > storing the rtentry pointer in the inpcb at all. I once did this for > an RELENG_4 machine without any ill effects (if done correctly). The > same applies to OpenBSD and NetBSD. > > -- > Andre > > > > ---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; > >> } > >> > >> _______________________________________________ > >> freebsd-stable_at_freebsd.org mailing list > >> http://lists.freebsd.org/mailman/listinfo/freebsd-stable > >> To unsubscribe, send any mail to "freebsd-stable-unsubscribe_at_freebsd.org" > > > > > > _______________________________________________ > > freebsd-current_at_freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-current > > To unsubscribe, send any mail to "freebsd-current-unsubscribe_at_freebsd.org" > > > > > > _______________________________________________ > freebsd-current_at_freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe_at_freebsd.org"Received on Fri May 07 2004 - 15:30:40 UTC
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