The following commit has been merged in the master branch: commit a3252702566c719a84853830c5aa5bea696d17f7 Author: Stefan Sperling stsp@stsp.in-berlin.de Date: Wed Oct 11 22:45:23 2006 +0200

Preliminary /dev/tun support for FreeBSD and OpenBSD. Not tested.

diff --git a/bsd.c b/bsd.c index e0ee8ac..f89ed8c 100644 --- a/bsd.c +++ b/bsd.c @@ -21,9 +21,15 @@ #include <sys/param.h> #include <sys/sysctl.h> #include <sys/socket.h> +#include <sys/ioctl.h> +#include <sys/stat.h> #include <netinet/in.h> #include <arpa/inet.h> #include <net/route.h> +#include <net/if.h> +#include <net/if_tun.h> +#include <fcntl.h> +#include <stdio.h> #include <string.h> #include <errno.h> #include <unistd.h> @@ -199,20 +205,119 @@ void add_del_route(unsigned int dest, unsigned int router, int del, } }

-int del_dev_tun(int fd) +#if defined(__OpenBSD__) +int open_tun_any(void) { - /* Implement me! */ - return 1; + int i; + int fd; + char tundev[12]; /* "/dev/tunxxx\0" */ + + for (i = 0; i < sizeof(tundev); i++) + tundev[i] = '\0'; + + /* Try opening tun device /dev/tun[0..255] */ + for (i = 0; i < 256; i++) { + snprintf(tundev, sizeof(tundev), "/dev/tun%i", i); + if ((fd = open(tundev, O_RDWR)) >= 0) { + printf("Using /dev/tun%i\n", i); + return fd; + } + } + return -1; +}; +#elif defined(__FreeBSD__) +int open_tun_any(void) +{ + int fd; + struct stat buf; + + /* Open lowest unused tun device */ + if ((fd = open("/dev/tun", O_RDWR)) >= 0) { + fstat(fd, &buf); + printf("Using %s\n", devname(buf.st_rdev, S_IFCHR)); + return fd; + } + return -1; +} +#endif + +/* Probe for tun interface availability */ +int probe_tun() +{ + int fd; + fd = open_tun_any(); + if (fd > 0) + close(fd); + return fd; }

-int add_dev_tun( struct batman_if *batman_if, unsigned int dest_addr, char *tun_dev, int *fd ) +int del_dev_tun(int fd) { - /* Implement me! */ - return 0; + return close(fd); }

-int probe_tun() +int add_dev_tun(struct batman_if *batman_if, unsigned int tun_addr, char *tun_dev, int *fd) { - /* Implement me! */ - return 0; + struct ifreq ifr_tun, ifr_if; + struct tuninfo ti; + struct sockaddr_in addr; + + /* set up tunnel device */ + memset(&ifr_tun, 0, sizeof(ifr_tun)); + memset(&ifr_if, 0, sizeof(ifr_if)); + + if ((*fd = open_tun_any()) < 0) { + perror("Could not open tun device"); + return -1; + } + + /* set ip of this end point of tunnel */ + memset(&addr, 0, sizeof(addr)); + addr.sin_addr.s_addr = tun_addr; + addr.sin_family = AF_INET; + memcpy(&ifr_tun.ifr_addr, &addr, sizeof(struct sockaddr)); + + if (ioctl(*fd, SIOCSIFADDR, &ifr_tun) < 0) { + perror("SIOCSIFADDR"); + del_dev_tun(*fd); + return -1; + } + + if (ioctl(*fd, SIOCGIFFLAGS, &ifr_tun) < 0) { + perror("SIOCGIFFLAGS"); + del_dev_tun(*fd); + return -1; + } + + ifr_tun.ifr_flags |= IFF_UP; + ifr_tun.ifr_flags |= IFF_RUNNING; + + if (ioctl(*fd, SIOCSIFFLAGS, &ifr_tun) < 0) { + perror("SIOCSIFFLAGS"); + del_dev_tun(*fd); + return -1; + } + + /* get MTU from real interface */ + strncpy(ifr_if.ifr_name, batman_if->dev, IFNAMSIZ - 1); + if (ioctl(*fd, SIOCGIFMTU, &ifr_if) < 0) { + perror("SIOCGIFMTU"); + del_dev_tun(*fd); + return -1; + } + + /* set MTU of tun interface: real MTU - 28 */ + if (ifr_if.ifr_mtu < 100) { + fprintf(stderr, "Warning: MTU smaller than 100 - cannot reduce MTU anymore\n" ); + } else { + ti.mtu = ifr_if.ifr_mtu - 28; + if (ioctl(*fd, TUNSIFMODE, &ti) < 0) { + perror("TUNSIFMODE"); + del_dev_tun(*fd); + return -1; + } + } + + strncpy(tun_dev, ifr_tun.ifr_name, IFNAMSIZ - 1); + return 1; }