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@ -16,14 +16,16 @@ |
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* |
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*/ |
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#ifdef __linux__ |
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#include "n2n.h" |
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/* ********************************** */ |
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static int setup_ifname (int fd, const char *ifname, const char *ipaddr, |
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const char *netmask, uint8_t *mac, int mtu) { |
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struct ifreq ifr; |
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memset(&ifr, 0, sizeof(ifr)); |
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@ -36,51 +38,50 @@ static int setup_ifname(int fd, const char *ifname, const char *ipaddr, |
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if(ioctl(fd, SIOCSIFHWADDR, &ifr) == -1) { |
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traceEvent(TRACE_ERROR, "ioctl(SIOCSIFHWADDR) failed [%d]: %s", errno, strerror(errno)); |
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return(-1); |
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return -1; |
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} |
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ifr.ifr_addr.sa_family = AF_INET; |
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/* Interface Address */ |
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// interface address
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inet_pton(AF_INET, ipaddr, &((struct sockaddr_in*)&ifr.ifr_addr)->sin_addr); |
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if(ioctl(fd, SIOCSIFADDR, &ifr) == -1) { |
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traceEvent(TRACE_ERROR, "ioctl(SIOCSIFADDR) failed [%d]: %s", errno, strerror(errno)); |
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return(-2); |
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return -2; |
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} |
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/* Netmask */ |
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// netmask
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if(netmask && (((struct sockaddr_in*)&ifr.ifr_addr)->sin_addr.s_addr != 0)) { |
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inet_pton(AF_INET, netmask, &((struct sockaddr_in*)&ifr.ifr_addr)->sin_addr); |
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if(ioctl(fd, SIOCSIFNETMASK, &ifr) == -1) { |
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traceEvent(TRACE_ERROR, "ioctl(SIOCSIFNETMASK, %s) failed [%d]: %s", netmask, errno, strerror(errno)); |
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return(-3); |
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return -3; |
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} |
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} |
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/* MTU */ |
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// MTU
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ifr.ifr_mtu = mtu; |
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if(ioctl(fd, SIOCSIFMTU, &ifr) == -1) { |
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traceEvent(TRACE_ERROR, "ioctl(SIOCSIFMTU) failed [%d]: %s", errno, strerror(errno)); |
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return(-4); |
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return -4; |
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} |
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/* Set up and running */ |
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// set up and running
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if(ioctl(fd, SIOCGIFFLAGS, &ifr) == -1) { |
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traceEvent(TRACE_ERROR, "ioctl(SIOCGIFFLAGS) failed [%d]: %s", errno, strerror(errno)); |
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return(-5); |
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return -5; |
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} |
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ifr.ifr_flags |= (IFF_UP | IFF_RUNNING); |
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if(ioctl(fd, SIOCSIFFLAGS, &ifr) == -1) { |
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traceEvent(TRACE_ERROR, "ioctl(SIOCSIFFLAGS) failed [%d]: %s", errno, strerror(errno)); |
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return(-6); |
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return -6; |
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} |
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return(0); |
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return 0; |
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} |
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/* ********************************** */ |
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/** @brief Open and configure the TAP device for packet read/write.
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* |
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@ -104,6 +105,7 @@ int tuntap_open(tuntap_dev *device, |
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char *device_mask, |
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const char * device_mac, |
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int mtu) { |
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char *tuntap_device = "/dev/net/tun"; |
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int ioctl_fd; |
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struct ifreq ifr; |
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@ -122,7 +124,10 @@ int tuntap_open(tuntap_dev *device, |
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} |
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memset(&ifr, 0, sizeof(ifr)); |
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ifr.ifr_flags = IFF_TAP|IFF_NO_PI; /* Want a TAP device for layer 2 frames. */ |
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// want a TAP device for layer 2 frames
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ifr.ifr_flags = IFF_TAP|IFF_NO_PI; |
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strncpy(ifr.ifr_name, dev, IFNAMSIZ-1); |
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ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
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rc = ioctl(device->fd, TUNSETIFF, (void *)&ifr); |
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@ -133,26 +138,29 @@ int tuntap_open(tuntap_dev *device, |
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return -1; |
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} |
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/* Store the device name for later reuse */ |
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// store the device name for later reuse
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strncpy(device->dev_name, ifr.ifr_name, MIN(IFNAMSIZ, N2N_IFNAMSIZ)); |
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if(device_mac && device_mac[0]) { |
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/* Use the user-provided MAC */ |
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// use the user-provided MAC
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str2mac(device->mac_addr, device_mac); |
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} else { |
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/* Set an explicit random MAC to know the exact MAC in use. Manually
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* reading the MAC address is not safe as it may change internally |
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* also after the TAP interface UP status has been notified. */ |
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// set an explicit random MAC to know the exact MAC in use, manually
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// reading the MAC address is not safe as it may change internally
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// also after the TAP interface UP status has been notified
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int i; |
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for(i = 0; i < 6; i++) |
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device->mac_addr[i] = n2n_rand(); |
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device->mac_addr[0] &= ~0x01; /* Clear multicast bit */ |
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device->mac_addr[0] |= 0x02; /* Set locally-assigned bit */ |
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// clear multicast bit
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device->mac_addr[0] &= ~0x01; |
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// set locally-assigned bit
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device->mac_addr[0] |= 0x02; |
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} |
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/* Initialize Netlink socket */ |
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// initialize netlink socket
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if((nl_fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) == -1) { |
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traceEvent(TRACE_ERROR, "netlink socket creation failed [%d]: %s", errno, strerror(errno)); |
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return -1; |
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@ -172,7 +180,7 @@ int tuntap_open(tuntap_dev *device, |
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msg.msg_iov = &iov; |
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msg.msg_iovlen = 1; |
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/* Subscribe to interface events */ |
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// subscribe to interface events
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if(bind(nl_fd, (struct sockaddr*)&sa, sizeof(sa)) == -1) { |
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traceEvent(TRACE_ERROR, "netlink socket bind failed [%d]: %s", errno, strerror(errno)); |
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return -1; |
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@ -193,7 +201,7 @@ int tuntap_open(tuntap_dev *device, |
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close(ioctl_fd); |
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/* Wait for the up and running notification */ |
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// wait for the up and running notification
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traceEvent(TRACE_INFO, "Waiting for TAP interface to be up and running..."); |
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while(!up_and_running) { |
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@ -212,7 +220,7 @@ int tuntap_open(tuntap_dev *device, |
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if(nh->nlmsg_type == NETLINK_GENERIC) { |
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struct ifinfomsg *ifi = NLMSG_DATA(nh); |
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/* NOTE: skipping interface name check, assuming it's our TAP */ |
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// NOTE: skipping interface name check, assuming it's our TAP
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if((ifi->ifi_flags & IFF_UP) && (ifi->ifi_flags & IFF_RUNNING)) { |
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up_and_running = 1; |
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traceEvent(TRACE_INFO, "Interface is up and running"); |
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@ -228,32 +236,31 @@ int tuntap_open(tuntap_dev *device, |
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device->device_mask = inet_addr(device_mask); |
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device->if_idx = if_nametoindex(dev); |
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return(device->fd); |
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return device->fd; |
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} |
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/* *************************************************** */ |
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int tuntap_read (struct tuntap_dev *tuntap, unsigned char *buf, int len) { |
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return(read(tuntap->fd, buf, len)); |
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return read(tuntap->fd, buf, len); |
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} |
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/* *************************************************** */ |
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int tuntap_write (struct tuntap_dev *tuntap, unsigned char *buf, int len) { |
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return(write(tuntap->fd, buf, len)); |
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return write(tuntap->fd, buf, len); |
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} |
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/* *************************************************** */ |
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void tuntap_close (struct tuntap_dev *tuntap) { |
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close(tuntap->fd); |
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} |
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/* *************************************************** */ |
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/* Fill out the ip_addr value from the interface. Called to pick up dynamic
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* address changes. */ |
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// fill out the ip_addr value from the interface, called to pick up dynamic address changes
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void tuntap_get_address (struct tuntap_dev *tuntap) { |
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struct ifreq ifr; |
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int fd; |
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@ -272,4 +279,5 @@ void tuntap_get_address(struct tuntap_dev *tuntap) { |
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close(fd); |
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} |
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#endif /* #ifdef __linux__ */ |
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Logan oos Even
4 years ago
GitHub