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188 lines
4.6 KiB
188 lines
4.6 KiB
// 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 by Harald Welte <[email protected]> |
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
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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 ([email protected]) and |
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* James Leu ([email protected]). |
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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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#include <linux/init.h> |
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#include <linux/netdevice.h> |
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#include "umcast.h" |
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#include <net_kern.h> |
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struct umcast_init { |
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char *addr; |
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int lport; |
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int rport; |
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int ttl; |
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bool unicast; |
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}; |
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static void umcast_init(struct net_device *dev, void *data) |
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{ |
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struct uml_net_private *pri; |
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struct umcast_data *dpri; |
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struct umcast_init *init = data; |
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pri = netdev_priv(dev); |
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dpri = (struct umcast_data *) pri->user; |
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dpri->addr = init->addr; |
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dpri->lport = init->lport; |
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dpri->rport = init->rport; |
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dpri->unicast = init->unicast; |
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dpri->ttl = init->ttl; |
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dpri->dev = dev; |
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if (dpri->unicast) { |
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printk(KERN_INFO "ucast backend address: %s:%u listen port: " |
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"%u\n", dpri->addr, dpri->rport, dpri->lport); |
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} else { |
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printk(KERN_INFO "mcast backend multicast address: %s:%u, " |
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"TTL:%u\n", dpri->addr, dpri->lport, dpri->ttl); |
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} |
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} |
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static int umcast_read(int fd, struct sk_buff *skb, struct uml_net_private *lp) |
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{ |
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return net_recvfrom(fd, skb_mac_header(skb), |
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skb->dev->mtu + ETH_HEADER_OTHER); |
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} |
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static int umcast_write(int fd, struct sk_buff *skb, struct uml_net_private *lp) |
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{ |
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return umcast_user_write(fd, skb->data, skb->len, |
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(struct umcast_data *) &lp->user); |
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} |
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static const struct net_kern_info umcast_kern_info = { |
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.init = umcast_init, |
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.protocol = eth_protocol, |
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.read = umcast_read, |
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.write = umcast_write, |
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}; |
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static int mcast_setup(char *str, char **mac_out, void *data) |
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{ |
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struct umcast_init *init = data; |
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char *port_str = NULL, *ttl_str = NULL, *remain; |
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char *last; |
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*init = ((struct umcast_init) |
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{ .addr = "239.192.168.1", |
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.lport = 1102, |
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.ttl = 1 }); |
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remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str, |
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NULL); |
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if (remain != NULL) { |
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printk(KERN_ERR "mcast_setup - Extra garbage on " |
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"specification : '%s'\n", remain); |
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return 0; |
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} |
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if (port_str != NULL) { |
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init->lport = simple_strtoul(port_str, &last, 10); |
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if ((*last != '\0') || (last == port_str)) { |
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printk(KERN_ERR "mcast_setup - Bad port : '%s'\n", |
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port_str); |
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return 0; |
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} |
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} |
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if (ttl_str != NULL) { |
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init->ttl = simple_strtoul(ttl_str, &last, 10); |
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if ((*last != '\0') || (last == ttl_str)) { |
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printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n", |
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ttl_str); |
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return 0; |
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} |
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} |
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init->unicast = false; |
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init->rport = init->lport; |
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printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr, |
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init->lport, init->ttl); |
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return 1; |
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} |
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static int ucast_setup(char *str, char **mac_out, void *data) |
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{ |
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struct umcast_init *init = data; |
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char *lport_str = NULL, *rport_str = NULL, *remain; |
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char *last; |
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*init = ((struct umcast_init) |
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{ .addr = "", |
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.lport = 1102, |
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.rport = 1102 }); |
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remain = split_if_spec(str, mac_out, &init->addr, |
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&lport_str, &rport_str, NULL); |
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if (remain != NULL) { |
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printk(KERN_ERR "ucast_setup - Extra garbage on " |
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"specification : '%s'\n", remain); |
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return 0; |
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} |
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if (lport_str != NULL) { |
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init->lport = simple_strtoul(lport_str, &last, 10); |
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if ((*last != '\0') || (last == lport_str)) { |
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printk(KERN_ERR "ucast_setup - Bad listen port : " |
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"'%s'\n", lport_str); |
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return 0; |
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} |
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} |
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if (rport_str != NULL) { |
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init->rport = simple_strtoul(rport_str, &last, 10); |
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if ((*last != '\0') || (last == rport_str)) { |
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printk(KERN_ERR "ucast_setup - Bad remote port : " |
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"'%s'\n", rport_str); |
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return 0; |
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} |
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} |
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init->unicast = true; |
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printk(KERN_INFO "Configured ucast device: :%u -> %s:%u\n", |
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init->lport, init->addr, init->rport); |
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return 1; |
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} |
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static struct transport mcast_transport = { |
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.list = LIST_HEAD_INIT(mcast_transport.list), |
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.name = "mcast", |
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.setup = mcast_setup, |
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.user = &umcast_user_info, |
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.kern = &umcast_kern_info, |
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.private_size = sizeof(struct umcast_data), |
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.setup_size = sizeof(struct umcast_init), |
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}; |
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static struct transport ucast_transport = { |
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.list = LIST_HEAD_INIT(ucast_transport.list), |
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.name = "ucast", |
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.setup = ucast_setup, |
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.user = &umcast_user_info, |
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.kern = &umcast_kern_info, |
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.private_size = sizeof(struct umcast_data), |
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.setup_size = sizeof(struct umcast_init), |
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}; |
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static int register_umcast(void) |
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{ |
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register_transport(&mcast_transport); |
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register_transport(&ucast_transport); |
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return 0; |
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} |
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late_initcall(register_umcast);
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