Loading...
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 | // SPDX-License-Identifier: GPL-2.0 /* * user-mode-linux networking multicast transport * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org> * * 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 <unistd.h> #include <errno.h> #include <netinet/in.h> #include "umcast.h" #include <net_user.h> #include <um_malloc.h> static struct sockaddr_in *new_addr(char *addr, unsigned short port) { struct sockaddr_in *sin; sin = uml_kmalloc(sizeof(struct sockaddr_in), UM_GFP_KERNEL); if (sin == NULL) { printk(UM_KERN_ERR "new_addr: allocation of sockaddr_in " "failed\n"); return NULL; } sin->sin_family = AF_INET; if (addr) sin->sin_addr.s_addr = in_aton(addr); else sin->sin_addr.s_addr = INADDR_ANY; sin->sin_port = htons(port); return sin; } static int umcast_user_init(void *data, void *dev) { struct umcast_data *pri = data; pri->remote_addr = new_addr(pri->addr, pri->rport); if (pri->unicast) pri->listen_addr = new_addr(NULL, pri->lport); else pri->listen_addr = pri->remote_addr; pri->dev = dev; return 0; } static void umcast_remove(void *data) { struct umcast_data *pri = data; kfree(pri->listen_addr); if (pri->unicast) kfree(pri->remote_addr); pri->listen_addr = pri->remote_addr = NULL; } static int umcast_open(void *data) { struct umcast_data *pri = data; struct sockaddr_in *lsin = pri->listen_addr; struct sockaddr_in *rsin = pri->remote_addr; struct ip_mreq mreq; int fd, yes = 1, err = -EINVAL; if ((!pri->unicast && lsin->sin_addr.s_addr == 0) || (rsin->sin_addr.s_addr == 0) || (lsin->sin_port == 0) || (rsin->sin_port == 0)) goto out; fd = socket(AF_INET, SOCK_DGRAM, 0); if (fd < 0) { err = -errno; printk(UM_KERN_ERR "umcast_open : data socket failed, " "errno = %d\n", errno); goto out; } if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) { err = -errno; printk(UM_KERN_ERR "umcast_open: SO_REUSEADDR failed, " "errno = %d\n", errno); goto out_close; } if (!pri->unicast) { /* set ttl according to config */ if (setsockopt(fd, SOL_IP, IP_MULTICAST_TTL, &pri->ttl, sizeof(pri->ttl)) < 0) { err = -errno; printk(UM_KERN_ERR "umcast_open: IP_MULTICAST_TTL " "failed, error = %d\n", errno); goto out_close; } /* set LOOP, so data does get fed back to local sockets */ if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) { err = -errno; printk(UM_KERN_ERR "umcast_open: IP_MULTICAST_LOOP " "failed, error = %d\n", errno); goto out_close; } } /* bind socket to the address */ if (bind(fd, (struct sockaddr *) lsin, sizeof(*lsin)) < 0) { err = -errno; printk(UM_KERN_ERR "umcast_open : data bind failed, " "errno = %d\n", errno); goto out_close; } if (!pri->unicast) { /* subscribe to the multicast group */ mreq.imr_multiaddr.s_addr = lsin->sin_addr.s_addr; mreq.imr_interface.s_addr = 0; if (setsockopt(fd, SOL_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) { err = -errno; printk(UM_KERN_ERR "umcast_open: IP_ADD_MEMBERSHIP " "failed, error = %d\n", errno); printk(UM_KERN_ERR "There appears not to be a " "multicast-capable network interface on the " "host.\n"); printk(UM_KERN_ERR "eth0 should be configured in order " "to use the multicast transport.\n"); goto out_close; } } return fd; out_close: close(fd); out: return err; } static void umcast_close(int fd, void *data) { struct umcast_data *pri = data; if (!pri->unicast) { struct ip_mreq mreq; struct sockaddr_in *lsin = pri->listen_addr; mreq.imr_multiaddr.s_addr = lsin->sin_addr.s_addr; mreq.imr_interface.s_addr = 0; if (setsockopt(fd, SOL_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) { printk(UM_KERN_ERR "umcast_close: IP_DROP_MEMBERSHIP " "failed, error = %d\n", errno); } } close(fd); } int umcast_user_write(int fd, void *buf, int len, struct umcast_data *pri) { struct sockaddr_in *data_addr = pri->remote_addr; return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr)); } const struct net_user_info umcast_user_info = { .init = umcast_user_init, .open = umcast_open, .close = umcast_close, .remove = umcast_remove, .add_address = NULL, .delete_address = NULL, .mtu = ETH_MAX_PACKET, .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER, }; |