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236 lines
5.9 KiB
C
236 lines
5.9 KiB
C
/*
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* Copyright (c) 2012 Tristan Le Guern <tleguern@bouledef.eu>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/param.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <netinet/if_ether.h>
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#include <netinet/in.h>
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#include <fcntl.h>
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#include <ifaddrs.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "tuntap.h"
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static int
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tuntap_sys_create_dev(struct device *dev, int tun)
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{
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return -1;
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}
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int
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tuntap_sys_start(struct device *dev, int mode, int tun)
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{
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struct ifreq ifr;
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struct ifaddrs *ifa;
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char name[MAXPATHLEN];
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int fd;
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char *type;
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fd = -1;
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/* Force creation of the driver if needed or let it resilient */
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if(mode & TUNTAP_MODE_PERSIST)
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{
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mode &= ~TUNTAP_MODE_PERSIST;
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/* TODO: Call tuntap_sys_create_dev() */
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}
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/* Set the mode: tun or tap */
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if(mode == TUNTAP_MODE_ETHERNET)
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{
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type = "tap";
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ifr.ifr_flags |= IFF_LINK0;
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}
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else if(mode == TUNTAP_MODE_TUNNEL)
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{
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type = "tun";
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ifr.ifr_flags &= ~IFF_LINK0;
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}
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else
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{
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tuntap_log(TUNTAP_LOG_ERR, "Invalid parameter 'mode'");
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return -1;
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}
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/* Try to use the given driver or loop throught the avaible ones */
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if(tun < TUNTAP_ID_MAX)
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{
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(void)snprintf(name, sizeof name, "/dev/%s%i", type, tun);
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fd = open(name, O_RDWR);
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}
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else if(tun == TUNTAP_ID_ANY)
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{
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for(tun = 0; tun < TUNTAP_ID_MAX; ++tun)
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{
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(void)memset(name, '\0', sizeof name);
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(void)snprintf(name, sizeof name, "/dev/%s%i", type, tun);
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if((fd = open(name, O_RDWR)) > 0)
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break;
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}
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}
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else
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{
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tuntap_log(TUNTAP_LOG_ERR, "Invalid parameter 'tun'");
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return -1;
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}
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switch(fd)
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{
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case -1:
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tuntap_log(TUNTAP_LOG_ERR, "Permission denied");
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return -1;
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case 256:
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tuntap_log(TUNTAP_LOG_ERR, "Can't find a tun entry");
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return -1;
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default:
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/* NOTREACHED */
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break;
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}
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/* Get the interface default values */
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if(ioctl(dev->ctrl_sock, SIOCGIFFLAGS, &ifr) == -1)
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{
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tuntap_log(TUNTAP_LOG_ERR, "Can't get interface values");
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return -1;
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}
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/* set interface name */
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strncpy(ifr.ifr_name, dev->if_name, sizeof(ifr.ifr_name));
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/* Set our modifications */
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if(ioctl(dev->ctrl_sock, SIOCSIFFLAGS, &ifr) == -1)
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{
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tuntap_log(TUNTAP_LOG_ERR, "Can't set interface values");
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return -1;
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}
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/* Save flags for tuntap_{up, down} */
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dev->flags = ifr.ifr_flags;
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/* Save pre-existing MAC address */
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if(mode == TUNTAP_MODE_ETHERNET && getifaddrs(&ifa) == 0)
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{
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struct ifaddrs *pifa;
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for(pifa = ifa; pifa != NULL; pifa = pifa->ifa_next)
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{
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if(strcmp(pifa->ifa_name, dev->if_name) == 0)
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{
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struct ether_addr eth_addr;
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/*
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* The MAC address is from 10 to 15.
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*
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* And yes, I know, the buffer is supposed
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* to have a size of 14 bytes.
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*/
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(void)memcpy(dev->hwaddr, pifa->ifa_addr->sa_data + 10, ETHER_ADDR_LEN);
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(void)memset(ð_addr.ether_addr_octet, 0, ETHER_ADDR_LEN);
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(void)memcpy(ð_addr.ether_addr_octet, pifa->ifa_addr->sa_data + 10,
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ETHER_ADDR_LEN);
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break;
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}
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}
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if(pifa == NULL)
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tuntap_log(TUNTAP_LOG_WARN, "Can't get link-layer address");
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freeifaddrs(ifa);
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}
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return fd;
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}
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void
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tuntap_sys_destroy(struct device *dev)
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{
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(void)dev;
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}
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int
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tuntap_sys_set_hwaddr(struct device *dev, struct ether_addr *eth_addr)
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{
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struct ifreq ifr;
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(void)memset(&ifr, '\0', sizeof ifr);
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(void)strlcpy(ifr.ifr_name, dev->if_name, sizeof ifr.ifr_name);
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ifr.ifr_addr.sa_len = ETHER_ADDR_LEN;
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ifr.ifr_addr.sa_family = AF_LINK;
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(void)memcpy(ifr.ifr_addr.sa_data, eth_addr, ETHER_ADDR_LEN);
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if(ioctl(dev->ctrl_sock, SIOCSIFLLADDR, &ifr) < 0)
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{
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tuntap_log(TUNTAP_LOG_ERR, "Can't set link-layer address");
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return -1;
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}
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return 0;
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}
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int
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tuntap_sys_set_ipv4(struct device *dev, t_tun_in_addr *s4, uint32_t bits)
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{
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struct ifaliasreq ifa;
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struct ifreq ifr;
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struct sockaddr_in addr;
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struct sockaddr_in mask;
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(void)memset(&ifa, '\0', sizeof ifa);
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(void)strlcpy(ifa.ifra_name, dev->if_name, sizeof ifa.ifra_name);
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(void)memset(&ifr, '\0', sizeof ifr);
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(void)strlcpy(ifr.ifr_name, dev->if_name, sizeof ifr.ifr_name);
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/* Delete previously assigned address */
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(void)ioctl(dev->ctrl_sock, SIOCDIFADDR, &ifr);
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/*
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* Fill-in the destination address and netmask,
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* but don't care of the broadcast address
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*/
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(void)memset(&addr, '\0', sizeof addr);
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = s4->s_addr;
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addr.sin_len = sizeof addr;
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(void)memcpy(&ifa.ifra_addr, &addr, sizeof addr);
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(void)memset(&mask, '\0', sizeof mask);
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mask.sin_family = AF_INET;
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mask.sin_addr.s_addr = bits;
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mask.sin_len = sizeof mask;
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(void)memcpy(&ifa.ifra_mask, &mask, sizeof ifa.ifra_mask);
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/* Simpler than calling SIOCSIFADDR and/or SIOCSIFBRDADDR */
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if(ioctl(dev->ctrl_sock, SIOCSIFADDR, &ifa) == -1)
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{
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tuntap_log(TUNTAP_LOG_ERR, "Can't set IP/netmask");
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return -1;
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}
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return 0;
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}
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int
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tuntap_sys_set_descr(struct device *dev, const char *descr, size_t len)
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{
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tuntap_log(TUNTAP_LOG_NOTICE,
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"Your system does not support tuntap_set_descr()");
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return -1;
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}
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