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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 | // SPDX-License-Identifier: GPL-2.0 /* * 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. * */ #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); |