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![Alex Dewar](/assets/img/avatar_default.png)
Convert files to use SPDX header. All files are licensed under the GPLv2. Signed-off-by: Alex Dewar <alex.dewar@gmx.co.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
184 lines
4.6 KiB
C
184 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* user-mode-linux networking multicast transport
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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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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*
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*/
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#include <unistd.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include "umcast.h"
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#include <net_user.h>
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#include <um_malloc.h>
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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 = uml_kmalloc(sizeof(struct sockaddr_in), UM_GFP_KERNEL);
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if (sin == NULL) {
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printk(UM_KERN_ERR "new_addr: allocation of sockaddr_in "
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"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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if (addr)
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sin->sin_addr.s_addr = in_aton(addr);
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else
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sin->sin_addr.s_addr = INADDR_ANY;
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sin->sin_port = htons(port);
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return sin;
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}
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static int umcast_user_init(void *data, void *dev)
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{
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struct umcast_data *pri = data;
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pri->remote_addr = new_addr(pri->addr, pri->rport);
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if (pri->unicast)
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pri->listen_addr = new_addr(NULL, pri->lport);
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else
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pri->listen_addr = pri->remote_addr;
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pri->dev = dev;
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return 0;
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}
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static void umcast_remove(void *data)
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{
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struct umcast_data *pri = data;
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kfree(pri->listen_addr);
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if (pri->unicast)
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kfree(pri->remote_addr);
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pri->listen_addr = pri->remote_addr = NULL;
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}
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static int umcast_open(void *data)
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{
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struct umcast_data *pri = data;
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struct sockaddr_in *lsin = pri->listen_addr;
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struct sockaddr_in *rsin = pri->remote_addr;
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struct ip_mreq mreq;
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int fd, yes = 1, err = -EINVAL;
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if ((!pri->unicast && lsin->sin_addr.s_addr == 0) ||
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(rsin->sin_addr.s_addr == 0) ||
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(lsin->sin_port == 0) || (rsin->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(UM_KERN_ERR "umcast_open : data socket failed, "
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"errno = %d\n", 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(UM_KERN_ERR "umcast_open: SO_REUSEADDR failed, "
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"errno = %d\n", errno);
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goto out_close;
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}
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if (!pri->unicast) {
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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(UM_KERN_ERR "umcast_open: IP_MULTICAST_TTL "
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"failed, error = %d\n", 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,
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&yes, sizeof(yes)) < 0) {
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err = -errno;
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printk(UM_KERN_ERR "umcast_open: IP_MULTICAST_LOOP "
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"failed, error = %d\n", errno);
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goto out_close;
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}
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}
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/* bind socket to the address */
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if (bind(fd, (struct sockaddr *) lsin, sizeof(*lsin)) < 0) {
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err = -errno;
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printk(UM_KERN_ERR "umcast_open : data bind failed, "
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"errno = %d\n", errno);
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goto out_close;
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}
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if (!pri->unicast) {
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/* subscribe to the multicast group */
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mreq.imr_multiaddr.s_addr = lsin->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(UM_KERN_ERR "umcast_open: IP_ADD_MEMBERSHIP "
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"failed, error = %d\n", errno);
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printk(UM_KERN_ERR "There appears not to be a "
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"multicast-capable network interface on the "
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"host.\n");
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printk(UM_KERN_ERR "eth0 should be configured in order "
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"to use the multicast transport.\n");
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goto out_close;
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}
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}
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return fd;
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out_close:
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close(fd);
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out:
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return err;
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}
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static void umcast_close(int fd, void *data)
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{
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struct umcast_data *pri = data;
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if (!pri->unicast) {
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struct ip_mreq mreq;
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struct sockaddr_in *lsin = pri->listen_addr;
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mreq.imr_multiaddr.s_addr = lsin->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(UM_KERN_ERR "umcast_close: IP_DROP_MEMBERSHIP "
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"failed, error = %d\n", errno);
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}
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}
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close(fd);
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}
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int umcast_user_write(int fd, void *buf, int len, struct umcast_data *pri)
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{
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struct sockaddr_in *data_addr = pri->remote_addr;
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return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr));
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}
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const struct net_user_info umcast_user_info = {
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.init = umcast_user_init,
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.open = umcast_open,
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.close = umcast_close,
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.remove = umcast_remove,
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.add_address = NULL,
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.delete_address = NULL,
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.mtu = ETH_MAX_PACKET,
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.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
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};
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