/* * user-mode-linux networking multicast transport * Copyright (C) 2001 by Harald Welte * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * * based on the existing uml-networking code, which is * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and * James Leu (jleu@mindspring.net). * Copyright (C) 2001 by various other people who didn't put their name here. * * Licensed under the GPL. */ #include "linux/init.h" #include #include "mcast.h" #include "net_kern.h" struct mcast_init { char *addr; int port; int ttl; }; static void mcast_init(struct net_device *dev, void *data) { struct uml_net_private *pri; struct mcast_data *dpri; struct mcast_init *init = data; pri = dev->priv; dpri = (struct mcast_data *) pri->user; dpri->addr = init->addr; dpri->port = init->port; dpri->ttl = init->ttl; dpri->dev = dev; printk("mcast backend multicast address: %s:%u, TTL:%u\n", dpri->addr, dpri->port, dpri->ttl); } static int mcast_read(int fd, struct sk_buff **skb, struct uml_net_private *lp) { *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER); if (*skb == NULL) return -ENOMEM; return net_recvfrom(fd, skb_mac_header(*skb), (*skb)->dev->mtu + ETH_HEADER_OTHER); } static int mcast_write(int fd, struct sk_buff **skb, struct uml_net_private *lp) { return mcast_user_write(fd, (*skb)->data, (*skb)->len, (struct mcast_data *) &lp->user); } static const struct net_kern_info mcast_kern_info = { .init = mcast_init, .protocol = eth_protocol, .read = mcast_read, .write = mcast_write, }; int mcast_setup(char *str, char **mac_out, void *data) { struct mcast_init *init = data; char *port_str = NULL, *ttl_str = NULL, *remain; char *last; *init = ((struct mcast_init) { .addr = "239.192.168.1", .port = 1102, .ttl = 1 }); remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str, NULL); if (remain != NULL) { printk(KERN_ERR "mcast_setup - Extra garbage on " "specification : '%s'\n", remain); return 0; } if (port_str != NULL) { init->port = simple_strtoul(port_str, &last, 10); if ((*last != '\0') || (last == port_str)) { printk(KERN_ERR "mcast_setup - Bad port : '%s'\n", port_str); return 0; } } if (ttl_str != NULL) { init->ttl = simple_strtoul(ttl_str, &last, 10); if ((*last != '\0') || (last == ttl_str)) { printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n", ttl_str); return 0; } } printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr, init->port, init->ttl); return 1; } static struct transport mcast_transport = { .list = LIST_HEAD_INIT(mcast_transport.list), .name = "mcast", .setup = mcast_setup, .user = &mcast_user_info, .kern = &mcast_kern_info, .private_size = sizeof(struct mcast_data), .setup_size = sizeof(struct mcast_init), }; static int register_mcast(void) { register_transport(&mcast_transport); return 0; } late_initcall(register_mcast);