![Al Viro](/assets/img/avatar_default.png)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
270 lines
5.2 KiB
C
270 lines
5.2 KiB
C
/*
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <stddef.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <net_user.h>
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#include <os.h>
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#include <um_malloc.h>
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int tap_open_common(void *dev, char *gate_addr)
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{
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int tap_addr[4];
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if (gate_addr == NULL)
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return 0;
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if (sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0],
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&tap_addr[1], &tap_addr[2], &tap_addr[3]) != 4) {
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printk(UM_KERN_ERR "Invalid tap IP address - '%s'\n",
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gate_addr);
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return -EINVAL;
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}
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return 0;
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}
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void tap_check_ips(char *gate_addr, unsigned char *eth_addr)
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{
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int tap_addr[4];
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if ((gate_addr != NULL) &&
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(sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0],
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&tap_addr[1], &tap_addr[2], &tap_addr[3]) == 4) &&
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(eth_addr[0] == tap_addr[0]) &&
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(eth_addr[1] == tap_addr[1]) &&
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(eth_addr[2] == tap_addr[2]) &&
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(eth_addr[3] == tap_addr[3])) {
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printk(UM_KERN_ERR "The tap IP address and the UML eth IP "
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"address must be different\n");
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}
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}
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/* Do reliable error handling as this fails frequently enough. */
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void read_output(int fd, char *output, int len)
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{
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int remain, ret, expected;
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char c;
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char *str;
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if (output == NULL) {
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output = &c;
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len = sizeof(c);
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}
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*output = '\0';
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ret = read(fd, &remain, sizeof(remain));
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if (ret != sizeof(remain)) {
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if (ret < 0)
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ret = -errno;
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expected = sizeof(remain);
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str = "length";
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goto err;
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}
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while (remain != 0) {
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expected = (remain < len) ? remain : len;
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ret = read(fd, output, expected);
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if (ret != expected) {
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if (ret < 0)
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ret = -errno;
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str = "data";
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goto err;
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}
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remain -= ret;
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}
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return;
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err:
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if (ret < 0)
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printk(UM_KERN_ERR "read_output - read of %s failed, "
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"errno = %d\n", str, -ret);
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else
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printk(UM_KERN_ERR "read_output - read of %s failed, read only "
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"%d of %d bytes\n", str, ret, expected);
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}
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int net_read(int fd, void *buf, int len)
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{
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int n;
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n = read(fd, buf, len);
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if ((n < 0) && (errno == EAGAIN))
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return 0;
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else if (n == 0)
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return -ENOTCONN;
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return n;
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}
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int net_recvfrom(int fd, void *buf, int len)
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{
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int n;
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CATCH_EINTR(n = recvfrom(fd, buf, len, 0, NULL, NULL));
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if (n < 0) {
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if (errno == EAGAIN)
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return 0;
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return -errno;
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}
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else if (n == 0)
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return -ENOTCONN;
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return n;
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}
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int net_write(int fd, void *buf, int len)
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{
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int n;
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n = write(fd, buf, len);
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if ((n < 0) && (errno == EAGAIN))
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return 0;
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else if (n == 0)
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return -ENOTCONN;
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return n;
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}
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int net_send(int fd, void *buf, int len)
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{
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int n;
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CATCH_EINTR(n = send(fd, buf, len, 0));
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if (n < 0) {
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if (errno == EAGAIN)
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return 0;
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return -errno;
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}
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else if (n == 0)
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return -ENOTCONN;
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return n;
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}
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int net_sendto(int fd, void *buf, int len, void *to, int sock_len)
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{
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int n;
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CATCH_EINTR(n = sendto(fd, buf, len, 0, (struct sockaddr *) to,
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sock_len));
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if (n < 0) {
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if (errno == EAGAIN)
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return 0;
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return -errno;
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}
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else if (n == 0)
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return -ENOTCONN;
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return n;
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}
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struct change_pre_exec_data {
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int close_me;
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int stdout;
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};
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static void change_pre_exec(void *arg)
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{
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struct change_pre_exec_data *data = arg;
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close(data->close_me);
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dup2(data->stdout, 1);
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}
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static int change_tramp(char **argv, char *output, int output_len)
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{
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int pid, fds[2], err;
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struct change_pre_exec_data pe_data;
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err = os_pipe(fds, 1, 0);
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if (err < 0) {
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printk(UM_KERN_ERR "change_tramp - pipe failed, err = %d\n",
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-err);
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return err;
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}
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pe_data.close_me = fds[0];
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pe_data.stdout = fds[1];
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pid = run_helper(change_pre_exec, &pe_data, argv);
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if (pid > 0) /* Avoid hang as we won't get data in failure case. */
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read_output(fds[0], output, output_len);
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close(fds[0]);
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close(fds[1]);
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if (pid > 0)
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helper_wait(pid);
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return pid;
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}
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static void change(char *dev, char *what, unsigned char *addr,
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unsigned char *netmask)
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{
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char addr_buf[sizeof("255.255.255.255\0")];
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char netmask_buf[sizeof("255.255.255.255\0")];
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char version[sizeof("nnnnn\0")];
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char *argv[] = { "uml_net", version, what, dev, addr_buf,
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netmask_buf, NULL };
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char *output;
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int output_len, pid;
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sprintf(version, "%d", UML_NET_VERSION);
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sprintf(addr_buf, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
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sprintf(netmask_buf, "%d.%d.%d.%d", netmask[0], netmask[1],
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netmask[2], netmask[3]);
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output_len = UM_KERN_PAGE_SIZE;
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output = uml_kmalloc(output_len, UM_GFP_KERNEL);
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if (output == NULL)
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printk(UM_KERN_ERR "change : failed to allocate output "
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"buffer\n");
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pid = change_tramp(argv, output, output_len);
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if (pid < 0) {
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kfree(output);
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return;
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}
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if (output != NULL) {
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printk("%s", output);
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kfree(output);
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}
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}
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void open_addr(unsigned char *addr, unsigned char *netmask, void *arg)
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{
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change(arg, "add", addr, netmask);
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}
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void close_addr(unsigned char *addr, unsigned char *netmask, void *arg)
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{
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change(arg, "del", addr, netmask);
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}
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char *split_if_spec(char *str, ...)
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{
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char **arg, *end;
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va_list ap;
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va_start(ap, str);
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while ((arg = va_arg(ap, char **)) != NULL) {
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if (*str == '\0')
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return NULL;
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end = strchr(str, ',');
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if (end != str)
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*arg = str;
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if (end == NULL)
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return NULL;
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*end++ = '\0';
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str = end;
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}
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va_end(ap);
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return str;
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}
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