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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 | // SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * 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 <stdint.h> #include <string.h> #include <unistd.h> #include <errno.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/time.h> #include <sys/un.h> #include "daemon.h" #include <net_user.h> #include <os.h> #include <um_malloc.h> enum request_type { REQ_NEW_CONTROL }; #define SWITCH_MAGIC 0xfeedface struct request_v3 { uint32_t magic; uint32_t version; enum request_type type; struct sockaddr_un sock; }; static struct sockaddr_un *new_addr(void *name, int len) { struct sockaddr_un *sun; sun = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL); if (sun == NULL) { printk(UM_KERN_ERR "new_addr: allocation of sockaddr_un " "failed\n"); return NULL; } sun->sun_family = AF_UNIX; memcpy(sun->sun_path, name, len); return sun; } static int connect_to_switch(struct daemon_data *pri) { struct sockaddr_un *ctl_addr = pri->ctl_addr; struct sockaddr_un *local_addr = pri->local_addr; struct sockaddr_un *sun; struct request_v3 req; int fd, n, err; pri->control = socket(AF_UNIX, SOCK_STREAM, 0); if (pri->control < 0) { err = -errno; printk(UM_KERN_ERR "daemon_open : control socket failed, " "errno = %d\n", -err); return err; } if (connect(pri->control, (struct sockaddr *) ctl_addr, sizeof(*ctl_addr)) < 0) { err = -errno; printk(UM_KERN_ERR "daemon_open : control connect failed, " "errno = %d\n", -err); goto out; } fd = socket(AF_UNIX, SOCK_DGRAM, 0); if (fd < 0) { err = -errno; printk(UM_KERN_ERR "daemon_open : data socket failed, " "errno = %d\n", -err); goto out; } if (bind(fd, (struct sockaddr *) local_addr, sizeof(*local_addr)) < 0) { err = -errno; printk(UM_KERN_ERR "daemon_open : data bind failed, " "errno = %d\n", -err); goto out_close; } sun = uml_kmalloc(sizeof(struct sockaddr_un), UM_GFP_KERNEL); if (sun == NULL) { printk(UM_KERN_ERR "new_addr: allocation of sockaddr_un " "failed\n"); err = -ENOMEM; goto out_close; } req.magic = SWITCH_MAGIC; req.version = SWITCH_VERSION; req.type = REQ_NEW_CONTROL; req.sock = *local_addr; n = write(pri->control, &req, sizeof(req)); if (n != sizeof(req)) { printk(UM_KERN_ERR "daemon_open : control setup request " "failed, err = %d\n", -errno); err = -ENOTCONN; goto out_free; } n = read(pri->control, sun, sizeof(*sun)); if (n != sizeof(*sun)) { printk(UM_KERN_ERR "daemon_open : read of data socket failed, " "err = %d\n", -errno); err = -ENOTCONN; goto out_free; } pri->data_addr = sun; return fd; out_free: kfree(sun); out_close: close(fd); out: close(pri->control); return err; } static int daemon_user_init(void *data, void *dev) { struct daemon_data *pri = data; struct timeval tv; struct { char zero; int pid; int usecs; } name; if (!strcmp(pri->sock_type, "unix")) pri->ctl_addr = new_addr(pri->ctl_sock, strlen(pri->ctl_sock) + 1); name.zero = 0; name.pid = os_getpid(); gettimeofday(&tv, NULL); name.usecs = tv.tv_usec; pri->local_addr = new_addr(&name, sizeof(name)); pri->dev = dev; pri->fd = connect_to_switch(pri); if (pri->fd < 0) { kfree(pri->local_addr); pri->local_addr = NULL; return pri->fd; } return 0; } static int daemon_open(void *data) { struct daemon_data *pri = data; return pri->fd; } static void daemon_remove(void *data) { struct daemon_data *pri = data; close(pri->fd); pri->fd = -1; close(pri->control); pri->control = -1; kfree(pri->data_addr); pri->data_addr = NULL; kfree(pri->ctl_addr); pri->ctl_addr = NULL; kfree(pri->local_addr); pri->local_addr = NULL; } int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri) { struct sockaddr_un *data_addr = pri->data_addr; return net_sendto(fd, buf, len, data_addr, sizeof(*data_addr)); } const struct net_user_info daemon_user_info = { .init = daemon_user_init, .open = daemon_open, .close = NULL, .remove = daemon_remove, .add_address = NULL, .delete_address = NULL, .mtu = ETH_MAX_PACKET, .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER, }; |