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Message-Id: <20070607151839.d8f1c164.dada1@cosmosbay.com> Date: Thu, 7 Jun 2007 15:18:39 +0200 From: Eric Dumazet <dada1@...mosbay.com> To: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> Cc: linux-kernel@...r.kernel.org, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Re: [2.6.22-rc4] UDP's local port assignment not working correctly. On Thu, 7 Jun 2007 20:40:39 +0900 Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> wrote: > Hello. > > Same local ports are assigned to multiple sockets. > The following program should print different local port number. > > ----- Start of program ----- > #include <stdio.h> > #include <unistd.h> > #include <sys/socket.h> > #include <sys/types.h> > #include <netinet/in.h> > > int main(int argc, char *argv[]) { > struct sockaddr_in addr; > socklen_t size = sizeof(addr); > int server = socket(PF_INET, SOCK_DGRAM, 0), client = socket(PF_INET, SOCK_DGRAM, 0); > addr.sin_family = AF_INET; > addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); > addr.sin_port = htons(0); > > printf("Server: Binding UDP 127.0.0.1 0 ... "); > bind(server, (struct sockaddr *) &addr, sizeof(addr)); > getsockname(server, (struct sockaddr *) &addr, &size); > printf("bound to port %d\n", ntohs(addr.sin_port)); > > printf("Client: Connecting UDP 127.0.0.1 %d ... ", ntohs(addr.sin_port)); > connect(client, (struct sockaddr *) &addr, sizeof(addr)); > getsockname(client, (struct sockaddr *) &addr, &size); > printf("bound to port %d\n", ntohs(addr.sin_port)); > > return 0; > } > ----- End of program ----- > > I told YOSHIFUJI Hideaki and he answered me that > this is a regression caused by changing UDP's hash search algorithm to 2-pass. > > Thanks. CC netdev Yes, this was discovered two days ago and David reverted four commits. http://git.kernel.org/?p=linux/kernel/git/davem/net-2.6.git;a=commitdiff;h=82c5fde20031375cd93fa5a247cf15603ea1f152 So it should probably be included in Linus tree very very soon. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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