/* * user-mode-linux networking multicast transport * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org> * 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 <linux/netdevice.h> #include "umcast.h" #include "net_kern.h" struct umcast_init { char *addr; int lport; int rport; int ttl; bool unicast; }; static void umcast_init(struct net_device *dev, void *data) { struct uml_net_private *pri; struct umcast_data *dpri; struct umcast_init *init = data; pri = netdev_priv(dev); dpri = (struct umcast_data *) pri->user; dpri->addr = init->addr; dpri->lport = init->lport; dpri->rport = init->rport; dpri->unicast = init->unicast; dpri->ttl = init->ttl; dpri->dev = dev; if (dpri->unicast) { printk(KERN_INFO "ucast backend address: %s:%u listen port: " "%u\n", dpri->addr, dpri->rport, dpri->lport); } else { printk(KERN_INFO "mcast backend multicast address: %s:%u, " "TTL:%u\n", dpri->addr, dpri->lport, dpri->ttl); } } static int umcast_read(int fd, struct sk_buff *skb, struct uml_net_private *lp) { return net_recvfrom(fd, skb_mac_header(skb), skb->dev->mtu + ETH_HEADER_OTHER); } static int umcast_write(int fd, struct sk_buff *skb, struct uml_net_private *lp) { return umcast_user_write(fd, skb->data, skb->len, (struct umcast_data *) &lp->user); } static const struct net_kern_info umcast_kern_info = { .init = umcast_init, .protocol = eth_protocol, .read = umcast_read, .write = umcast_write, }; static int mcast_setup(char *str, char **mac_out, void *data) { struct umcast_init *init = data; char *port_str = NULL, *ttl_str = NULL, *remain; char *last; *init = ((struct umcast_init) { .addr = "239.192.168.1", .lport = 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->lport = 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; } } init->unicast = false; init->rport = init->lport; printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr, init->lport, init->ttl); return 1; } static int ucast_setup(char *str, char **mac_out, void *data) { struct umcast_init *init = data; char *lport_str = NULL, *rport_str = NULL, *remain; char *last; *init = ((struct umcast_init) { .addr = "", .lport = 1102, .rport = 1102 }); remain = split_if_spec(str, mac_out, &init->addr, &lport_str, &rport_str, NULL); if (remain != NULL) { printk(KERN_ERR "ucast_setup - Extra garbage on " "specification : '%s'\n", remain); return 0; } if (lport_str != NULL) { init->lport = simple_strtoul(lport_str, &last, 10); if ((*last != '\0') || (last == lport_str)) { printk(KERN_ERR "ucast_setup - Bad listen port : " "'%s'\n", lport_str); return 0; } } if (rport_str != NULL) { init->rport = simple_strtoul(rport_str, &last, 10); if ((*last != '\0') || (last == rport_str)) { printk(KERN_ERR "ucast_setup - Bad remote port : " "'%s'\n", rport_str); return 0; } } init->unicast = true; printk(KERN_INFO "Configured ucast device: :%u -> %s:%u\n", init->lport, init->addr, init->rport); return 1; } static struct transport mcast_transport = { .list = LIST_HEAD_INIT(mcast_transport.list), .name = "mcast", .setup = mcast_setup, .user = &umcast_user_info, .kern = &umcast_kern_info, .private_size = sizeof(struct umcast_data), .setup_size = sizeof(struct umcast_init), }; static struct transport ucast_transport = { .list = LIST_HEAD_INIT(ucast_transport.list), .name = "ucast", .setup = ucast_setup, .user = &umcast_user_info, .kern = &umcast_kern_info, .private_size = sizeof(struct umcast_data), .setup_size = sizeof(struct umcast_init), }; static int register_umcast(void) { register_transport(&mcast_transport); register_transport(&ucast_transport); return 0; } late_initcall(register_umcast);