diff options
| -rw-r--r-- | src/tuntap.c | 143 |
1 files changed, 113 insertions, 30 deletions
diff --git a/src/tuntap.c b/src/tuntap.c index fb7026f..bf0c49c 100644 --- a/src/tuntap.c +++ b/src/tuntap.c @@ -31,14 +31,30 @@ #include <sys/ioctl.h> -#if defined(__linux__) +#ifdef __linux__ #include <linux/if_tun.h> +#else + +#include <net/if_tun.h> + +#ifdef __FreeBSD__ +#include <net/if_tap.h> +#endif + +#endif + +#ifdef __linux__ static const bool multiaf_tun = false; +#else +static const bool multiaf_tun = true; +#endif +#if defined(__linux__) + void fastd_tuntap_open(fastd_context_t *ctx) { struct ifreq ifr = {}; @@ -88,30 +104,22 @@ void fastd_tuntap_open(fastd_context_t *ctx) { pr_debug(ctx, "tun/tap device initialized."); } -#elif defined(__FreeBSD__) - -#include <net/if_tun.h> -#include <net/if_tap.h> - - -static const bool multiaf_tun = true; +#elif defined(__FreeBSD__) || defined(__OpenBSD__) +static void set_tun_mtu(fastd_context_t *ctx) { + struct tuninfo tuninfo; -static void setup_tap(fastd_context_t *ctx) { - struct ifreq ifr = {}; + if (ioctl(ctx->tunfd, TUNGIFINFO, &tuninfo) < 0) + exit_errno(ctx, "TUNGIFINFO ioctl failed"); - if (ioctl(ctx->tunfd, TAPGIFNAME, &ifr) < 0) - exit_errno(ctx, "TAPGIFNAME ioctl failed"); + tuninfo.mtu = ctx->conf->mtu; - free(ctx->ifname); - ctx->ifname = strndup(ifr.ifr_name, IFNAMSIZ-1); + if (ioctl(ctx->tunfd, TUNSIFINFO, &tuninfo) < 0) + exit_errno(ctx, "TUNSIFINFO ioctl failed"); } -static void setup_tun(fastd_context_t *ctx) { - int one = 1; - if (ioctl(ctx->tunfd, TUNSIFHEAD, &one) < 0) - exit_errno(ctx, "TUNSIFHEAD ioctl failed"); -} + +#ifdef __FreeBSD__ static void set_tap_mtu(fastd_context_t *ctx) { struct tapinfo tapinfo; @@ -125,16 +133,24 @@ static void set_tap_mtu(fastd_context_t *ctx) { exit_errno(ctx, "TAPSIFINFO ioctl failed"); } -static void set_tun_mtu(fastd_context_t *ctx) { - struct tuninfo tuninfo; +static void setup_tun(fastd_context_t *ctx) { + int one = 1; + if (ioctl(ctx->tunfd, TUNSIFHEAD, &one) < 0) + exit_errno(ctx, "TUNSIFHEAD ioctl failed"); - if (ioctl(ctx->tunfd, TUNGIFINFO, &tuninfo) < 0) - exit_errno(ctx, "TUNGIFINFO ioctl failed"); + set_tun_mtu(ctx); +} - tuninfo.mtu = ctx->conf->mtu; +static void setup_tap(fastd_context_t *ctx) { + struct ifreq ifr = {}; - if (ioctl(ctx->tunfd, TUNSIFINFO, &tuninfo) < 0) - exit_errno(ctx, "TUNSIFINFO ioctl failed"); + if (ioctl(ctx->tunfd, TAPGIFNAME, &ifr) < 0) + exit_errno(ctx, "TAPGIFNAME ioctl failed"); + + free(ctx->ifname); + ctx->ifname = strndup(ifr.ifr_name, IFNAMSIZ-1); + + set_tap_mtu(ctx); } void fastd_tuntap_open(fastd_context_t *ctx) { @@ -168,18 +184,16 @@ void fastd_tuntap_open(fastd_context_t *ctx) { switch (ctx->conf->mode) { case MODE_TAP: if (strncmp(ctx->ifname, "tap", 3) != 0) - exit_error(ctx, "opened device doesn't to be a tap device"); + exit_error(ctx, "opened device doesn't seem to be a tap device"); setup_tap(ctx); - set_tap_mtu(ctx); break; case MODE_TUN: if (strncmp(ctx->ifname, "tun", 3) != 0) - exit_error(ctx, "opened device doesn't to be a tun device"); + exit_error(ctx, "opened device doesn't seem to be a tun device"); setup_tun(ctx); - set_tun_mtu(ctx); break; default: @@ -189,6 +203,75 @@ void fastd_tuntap_open(fastd_context_t *ctx) { pr_debug(ctx, "tun/tap device initialized."); } +#else /* __OpenBSD__ */ + +static void set_link0(fastd_context_t *ctx, bool set) { + struct ifreq ifr = {}; + + int ctl_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP); + if (ctl_sock < 0) + exit_errno(ctx, "socket"); + + strncpy(ifr.ifr_name, ctx->ifname, IFNAMSIZ-1); + if (ioctl(ctl_sock, SIOCGIFFLAGS, &ifr) < 0) + exit_errno(ctx, "SIOCGIFFLAGS ioctl failed"); + + if (set) + ifr.ifr_flags |= IFF_LINK0; + else + ifr.ifr_flags &= ~IFF_LINK0; + + if (ioctl(ctl_sock, SIOCSIFFLAGS, &ifr) < 0) + exit_errno(ctx, "SIOCSIFFLAGS ioctl failed"); + + if (close(ctl_sock)) + pr_error_errno(ctx, "close"); +} + +static void setup_tun(fastd_context_t *ctx) { + set_link0(ctx, false); + set_tun_mtu(ctx); +} + +static void setup_tap(fastd_context_t *ctx) { + set_link0(ctx, true); + set_tun_mtu(ctx); +} + +void fastd_tuntap_open(fastd_context_t *ctx) { + char ifname[5+IFNAMSIZ] = "/dev/"; + if (!ctx->conf->ifname) + exit_error(ctx, "config error: no interface name given."); + else if (strncmp(ctx->conf->ifname, "tun", 3) != 0) + exit_error(ctx, "config error: `%s' doesn't seem to be a tun device", ctx->conf->ifname); + else + strncat(ifname, ctx->conf->ifname, IFNAMSIZ-1); + + pr_debug(ctx, "initializing tun device..."); + + if ((ctx->tunfd = open(ifname, O_RDWR|O_CLOEXEC|O_NONBLOCK)) < 0) + exit_errno(ctx, "could not open tun device file"); + + ctx->ifname = strndup(ctx->conf->ifname, IFNAMSIZ-1); + + switch (ctx->conf->mode) { + case MODE_TAP: + setup_tap(ctx); + break; + + case MODE_TUN: + setup_tun(ctx); + break; + + default: + exit_bug(ctx, "invalid mode"); + } + + pr_debug(ctx, "tun device initialized."); +} + +#endif + #else #error unknown tun/tap implementation |