Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com) |
| 3 | * Licensed under the GPL |
| 4 | */ |
| 5 | |
| 6 | #include <stddef.h> |
| 7 | #include <stdarg.h> |
| 8 | #include <unistd.h> |
| 9 | #include <stdio.h> |
| 10 | #include <errno.h> |
| 11 | #include <stdlib.h> |
| 12 | #include <string.h> |
| 13 | #include <sys/socket.h> |
| 14 | #include <sys/wait.h> |
| 15 | #include "user.h" |
| 16 | #include "user_util.h" |
| 17 | #include "kern_util.h" |
| 18 | #include "net_user.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include "os.h" |
| 20 | |
| 21 | int tap_open_common(void *dev, char *gate_addr) |
| 22 | { |
| 23 | int tap_addr[4]; |
| 24 | |
| 25 | if(gate_addr == NULL) return(0); |
| 26 | if(sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0], |
| 27 | &tap_addr[1], &tap_addr[2], &tap_addr[3]) != 4){ |
| 28 | printk("Invalid tap IP address - '%s'\n", gate_addr); |
| 29 | return(-EINVAL); |
| 30 | } |
| 31 | return(0); |
| 32 | } |
| 33 | |
Jeff Dike | da00d9a | 2005-06-08 15:48:01 -0700 | [diff] [blame] | 34 | void tap_check_ips(char *gate_addr, unsigned char *eth_addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | { |
| 36 | int tap_addr[4]; |
| 37 | |
| 38 | if((gate_addr != NULL) && |
| 39 | (sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0], |
| 40 | &tap_addr[1], &tap_addr[2], &tap_addr[3]) == 4) && |
| 41 | (eth_addr[0] == tap_addr[0]) && |
| 42 | (eth_addr[1] == tap_addr[1]) && |
| 43 | (eth_addr[2] == tap_addr[2]) && |
| 44 | (eth_addr[3] == tap_addr[3])){ |
| 45 | printk("The tap IP address and the UML eth IP address" |
| 46 | " must be different\n"); |
| 47 | } |
| 48 | } |
| 49 | |
Paolo 'Blaisorblade' Giarrusso | f462e8f | 2006-02-24 13:03:57 -0800 | [diff] [blame] | 50 | /* Do reliable error handling as this fails frequently enough. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | void read_output(int fd, char *output, int len) |
| 52 | { |
Paolo 'Blaisorblade' Giarrusso | f462e8f | 2006-02-24 13:03:57 -0800 | [diff] [blame] | 53 | int remain, ret, expected; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | char c; |
Paolo 'Blaisorblade' Giarrusso | f462e8f | 2006-02-24 13:03:57 -0800 | [diff] [blame] | 55 | char *str; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | if(output == NULL){ |
| 58 | output = &c; |
| 59 | len = sizeof(c); |
| 60 | } |
| 61 | |
| 62 | *output = '\0'; |
Paolo 'Blaisorblade' Giarrusso | f462e8f | 2006-02-24 13:03:57 -0800 | [diff] [blame] | 63 | ret = os_read_file(fd, &remain, sizeof(remain)); |
| 64 | |
| 65 | if (ret != sizeof(remain)) { |
| 66 | expected = sizeof(remain); |
| 67 | str = "length"; |
| 68 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | } |
| 70 | |
| 71 | while(remain != 0){ |
Paolo 'Blaisorblade' Giarrusso | f462e8f | 2006-02-24 13:03:57 -0800 | [diff] [blame] | 72 | expected = (remain < len) ? remain : len; |
| 73 | ret = os_read_file(fd, output, expected); |
| 74 | if (ret != expected) { |
| 75 | str = "data"; |
| 76 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | } |
Paolo 'Blaisorblade' Giarrusso | f462e8f | 2006-02-24 13:03:57 -0800 | [diff] [blame] | 78 | remain -= ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | } |
Paolo 'Blaisorblade' Giarrusso | f462e8f | 2006-02-24 13:03:57 -0800 | [diff] [blame] | 80 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | return; |
Paolo 'Blaisorblade' Giarrusso | f462e8f | 2006-02-24 13:03:57 -0800 | [diff] [blame] | 82 | |
| 83 | err: |
| 84 | if (ret < 0) |
| 85 | printk("read_output - read of %s failed, errno = %d\n", str, -ret); |
| 86 | else |
| 87 | printk("read_output - read of %s failed, read only %d of %d bytes\n", str, ret, expected); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | int net_read(int fd, void *buf, int len) |
| 91 | { |
| 92 | int n; |
| 93 | |
| 94 | n = os_read_file(fd, buf, len); |
| 95 | |
| 96 | if(n == -EAGAIN) |
| 97 | return(0); |
| 98 | else if(n == 0) |
| 99 | return(-ENOTCONN); |
| 100 | return(n); |
| 101 | } |
| 102 | |
| 103 | int net_recvfrom(int fd, void *buf, int len) |
| 104 | { |
| 105 | int n; |
| 106 | |
| 107 | while(((n = recvfrom(fd, buf, len, 0, NULL, NULL)) < 0) && |
| 108 | (errno == EINTR)) ; |
| 109 | |
| 110 | if(n < 0){ |
| 111 | if(errno == EAGAIN) return(0); |
| 112 | return(-errno); |
| 113 | } |
| 114 | else if(n == 0) return(-ENOTCONN); |
| 115 | return(n); |
| 116 | } |
| 117 | |
| 118 | int net_write(int fd, void *buf, int len) |
| 119 | { |
| 120 | int n; |
| 121 | |
| 122 | n = os_write_file(fd, buf, len); |
| 123 | |
| 124 | if(n == -EAGAIN) |
| 125 | return(0); |
| 126 | else if(n == 0) |
| 127 | return(-ENOTCONN); |
| 128 | return(n); |
| 129 | } |
| 130 | |
| 131 | int net_send(int fd, void *buf, int len) |
| 132 | { |
| 133 | int n; |
| 134 | |
| 135 | while(((n = send(fd, buf, len, 0)) < 0) && (errno == EINTR)) ; |
| 136 | if(n < 0){ |
| 137 | if(errno == EAGAIN) return(0); |
| 138 | return(-errno); |
| 139 | } |
| 140 | else if(n == 0) return(-ENOTCONN); |
| 141 | return(n); |
| 142 | } |
| 143 | |
| 144 | int net_sendto(int fd, void *buf, int len, void *to, int sock_len) |
| 145 | { |
| 146 | int n; |
| 147 | |
| 148 | while(((n = sendto(fd, buf, len, 0, (struct sockaddr *) to, |
| 149 | sock_len)) < 0) && (errno == EINTR)) ; |
| 150 | if(n < 0){ |
| 151 | if(errno == EAGAIN) return(0); |
| 152 | return(-errno); |
| 153 | } |
| 154 | else if(n == 0) return(-ENOTCONN); |
| 155 | return(n); |
| 156 | } |
| 157 | |
| 158 | struct change_pre_exec_data { |
| 159 | int close_me; |
| 160 | int stdout; |
| 161 | }; |
| 162 | |
| 163 | static void change_pre_exec(void *arg) |
| 164 | { |
| 165 | struct change_pre_exec_data *data = arg; |
| 166 | |
| 167 | os_close_file(data->close_me); |
| 168 | dup2(data->stdout, 1); |
| 169 | } |
| 170 | |
| 171 | static int change_tramp(char **argv, char *output, int output_len) |
| 172 | { |
| 173 | int pid, fds[2], err; |
| 174 | struct change_pre_exec_data pe_data; |
| 175 | |
| 176 | err = os_pipe(fds, 1, 0); |
| 177 | if(err < 0){ |
| 178 | printk("change_tramp - pipe failed, err = %d\n", -err); |
| 179 | return(err); |
| 180 | } |
| 181 | pe_data.close_me = fds[0]; |
| 182 | pe_data.stdout = fds[1]; |
| 183 | pid = run_helper(change_pre_exec, &pe_data, argv, NULL); |
| 184 | |
| 185 | read_output(fds[0], output, output_len); |
| 186 | os_close_file(fds[0]); |
| 187 | os_close_file(fds[1]); |
| 188 | |
| 189 | if (pid > 0) |
| 190 | CATCH_EINTR(err = waitpid(pid, NULL, 0)); |
| 191 | return(pid); |
| 192 | } |
| 193 | |
| 194 | static void change(char *dev, char *what, unsigned char *addr, |
| 195 | unsigned char *netmask) |
| 196 | { |
| 197 | char addr_buf[sizeof("255.255.255.255\0")]; |
| 198 | char netmask_buf[sizeof("255.255.255.255\0")]; |
| 199 | char version[sizeof("nnnnn\0")]; |
| 200 | char *argv[] = { "uml_net", version, what, dev, addr_buf, |
| 201 | netmask_buf, NULL }; |
| 202 | char *output; |
| 203 | int output_len, pid; |
| 204 | |
| 205 | sprintf(version, "%d", UML_NET_VERSION); |
| 206 | sprintf(addr_buf, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]); |
| 207 | sprintf(netmask_buf, "%d.%d.%d.%d", netmask[0], netmask[1], |
| 208 | netmask[2], netmask[3]); |
| 209 | |
| 210 | output_len = page_size(); |
| 211 | output = um_kmalloc(output_len); |
| 212 | if(output == NULL) |
| 213 | printk("change : failed to allocate output buffer\n"); |
| 214 | |
| 215 | pid = change_tramp(argv, output, output_len); |
| 216 | if(pid < 0) return; |
| 217 | |
| 218 | if(output != NULL){ |
| 219 | printk("%s", output); |
| 220 | kfree(output); |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | void open_addr(unsigned char *addr, unsigned char *netmask, void *arg) |
| 225 | { |
| 226 | change(arg, "add", addr, netmask); |
| 227 | } |
| 228 | |
| 229 | void close_addr(unsigned char *addr, unsigned char *netmask, void *arg) |
| 230 | { |
| 231 | change(arg, "del", addr, netmask); |
| 232 | } |
| 233 | |
| 234 | char *split_if_spec(char *str, ...) |
| 235 | { |
| 236 | char **arg, *end; |
| 237 | va_list ap; |
| 238 | |
| 239 | va_start(ap, str); |
| 240 | while((arg = va_arg(ap, char **)) != NULL){ |
| 241 | if(*str == '\0') |
| 242 | return(NULL); |
| 243 | end = strchr(str, ','); |
| 244 | if(end != str) |
| 245 | *arg = str; |
| 246 | if(end == NULL) |
| 247 | return(NULL); |
| 248 | *end++ = '\0'; |
| 249 | str = end; |
| 250 | } |
| 251 | va_end(ap); |
| 252 | return(str); |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * Overrides for Emacs so that we follow Linus's tabbing style. |
| 257 | * Emacs will notice this stuff at the end of the file and automatically |
| 258 | * adjust the settings for this buffer only. This must remain at the end |
| 259 | * of the file. |
| 260 | * --------------------------------------------------------------------------- |
| 261 | * Local variables: |
| 262 | * c-file-style: "linux" |
| 263 | * End: |
| 264 | */ |