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![Paolo 'Blaisorblade' Giarrusso](/assets/img/avatar_default.png)
printk clears the host errno (I verified this in debugging and it's reasonable enough, given that it ends via a write call on some fd, especially since printk() goes on /dev/tty0 which is often the host stdout). So save errno earlier. There's no reason to change the printk calls to use -err rather than errno - the assignment can't clear errno. And in the first failure path, we used to return 0 too (and this time more clearly), which is totally wrong. 0 is a success fd, which is then registered and gives a "registering fd twice" warning. Finally, fix up some whitespace. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Acked-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
164 lines
3.9 KiB
C
164 lines
3.9 KiB
C
/*
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* user-mode-linux networking multicast transport
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* Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
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*
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* based on the existing uml-networking code, which is
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* Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
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* James Leu (jleu@mindspring.net).
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* Copyright (C) 2001 by various other people who didn't put their name here.
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*
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* Licensed under the GPL.
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*
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*/
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#include <errno.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include "net_user.h"
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#include "mcast.h"
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#include "kern_util.h"
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#include "user_util.h"
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#include "user.h"
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#include "os.h"
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#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
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static struct sockaddr_in *new_addr(char *addr, unsigned short port)
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{
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struct sockaddr_in *sin;
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sin = um_kmalloc(sizeof(struct sockaddr_in));
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if(sin == NULL){
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printk("new_addr: allocation of sockaddr_in failed\n");
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return(NULL);
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}
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = in_aton(addr);
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sin->sin_port = htons(port);
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return(sin);
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}
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static void mcast_user_init(void *data, void *dev)
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{
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struct mcast_data *pri = data;
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pri->mcast_addr = new_addr(pri->addr, pri->port);
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pri->dev = dev;
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}
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static int mcast_open(void *data)
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{
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struct mcast_data *pri = data;
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struct sockaddr_in *sin = pri->mcast_addr;
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struct ip_mreq mreq;
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int fd, yes = 1, err = -EINVAL;
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if ((sin->sin_addr.s_addr == 0) || (sin->sin_port == 0))
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goto out;
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fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd < 0){
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err = -errno;
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printk("mcast_open : data socket failed, errno = %d\n",
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errno);
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goto out;
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}
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if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
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err = -errno;
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printk("mcast_open: SO_REUSEADDR failed, errno = %d\n",
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errno);
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goto out_close;
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}
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/* set ttl according to config */
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if (setsockopt(fd, SOL_IP, IP_MULTICAST_TTL, &pri->ttl,
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sizeof(pri->ttl)) < 0) {
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err = -errno;
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printk("mcast_open: IP_MULTICAST_TTL failed, error = %d\n",
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errno);
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goto out_close;
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}
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/* set LOOP, so data does get fed back to local sockets */
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if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) {
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err = -errno;
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printk("mcast_open: IP_MULTICAST_LOOP failed, error = %d\n",
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errno);
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goto out_close;
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}
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/* bind socket to mcast address */
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if (bind(fd, (struct sockaddr *) sin, sizeof(*sin)) < 0) {
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err = -errno;
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printk("mcast_open : data bind failed, errno = %d\n", errno);
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goto out_close;
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}
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/* subscribe to the multicast group */
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mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr;
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mreq.imr_interface.s_addr = 0;
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if (setsockopt(fd, SOL_IP, IP_ADD_MEMBERSHIP,
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&mreq, sizeof(mreq)) < 0) {
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err = -errno;
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printk("mcast_open: IP_ADD_MEMBERSHIP failed, error = %d\n",
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errno);
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printk("There appears not to be a multicast-capable network "
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"interface on the host.\n");
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printk("eth0 should be configured in order to use the "
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"multicast transport.\n");
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goto out_close;
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}
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return fd;
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out_close:
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os_close_file(fd);
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out:
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return err;
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}
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static void mcast_close(int fd, void *data)
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{
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struct ip_mreq mreq;
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struct mcast_data *pri = data;
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struct sockaddr_in *sin = pri->mcast_addr;
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mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr;
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mreq.imr_interface.s_addr = 0;
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if (setsockopt(fd, SOL_IP, IP_DROP_MEMBERSHIP,
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&mreq, sizeof(mreq)) < 0) {
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printk("mcast_open: IP_DROP_MEMBERSHIP failed, error = %d\n",
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errno);
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}
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os_close_file(fd);
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}
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int mcast_user_write(int fd, void *buf, int len, struct mcast_data *pri)
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{
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struct sockaddr_in *data_addr = pri->mcast_addr;
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return(net_sendto(fd, buf, len, data_addr, sizeof(*data_addr)));
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}
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static int mcast_set_mtu(int mtu, void *data)
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{
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return(mtu);
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}
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struct net_user_info mcast_user_info = {
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.init = mcast_user_init,
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.open = mcast_open,
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.close = mcast_close,
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.remove = NULL,
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.set_mtu = mcast_set_mtu,
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.add_address = NULL,
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.delete_address = NULL,
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.max_packet = MAX_PACKET - ETH_HEADER_OTHER
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};
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