diff options
Diffstat (limited to 'toys/net/tunctl.c')
| -rw-r--r-- | toys/net/tunctl.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/toys/net/tunctl.c b/toys/net/tunctl.c index c7bf8927..1aafebfd 100644 --- a/toys/net/tunctl.c +++ b/toys/net/tunctl.c @@ -3,21 +3,28 @@ * Copyright 2016 Rob Landley <rob@landley.net> * * See http://kernel.org/doc/Documentation/networking/tuntap.txt + * + * This is useful for things like "kvm -netdev tap" and containers. + * See https://landley.net/lxc/02-networking.html for example usage. + * + * todo: bridge mode + * -b bridge daemon (forwards packets between NAME and NAME2 interfaces) -USE_TUNCTL(NEWTOY(tunctl, "<1>1t|d|u:[!td]", TOYFLAG_USR|TOYFLAG_BIN)) + +USE_TUNCTL(NEWTOY(tunctl, "<1>1t|d|u:T[!td]", TOYFLAG_USR|TOYFLAG_BIN)) config TUNCTL bool "tunctl" default y help - usage: tunctl [-dt] [-u USER] NAME + usage: tunctl [-dtT] [-u USER] NAME Create and delete tun/tap virtual ethernet devices. - A tap device Template for new commands. You don't need this. - -d Delete tun device - -t Create tun device - -u Owner of new device + -T Use tap (ethernet frames) instead of tun (ip packets) + -d Delete tun/tap device + -t Create tun/tap device + -u Set owner (user who can read/write device without root access) */ #define FOR_tunctl @@ -34,9 +41,11 @@ void tunctl_main(void) uid_t u = TT.user ? xgetuid(TT.user) : 0; int fd = xopen("/dev/net/tun", O_RDWR); - ifr->ifr_flags = IFF_TAP|IFF_NO_PI; + // Associate filehandle with device + ifr->ifr_flags = ((toys.optflags&FLAG_T) ? IFF_TUN : IFF_TAP)|IFF_NO_PI; strncpy(ifr->ifr_name, *toys.optargs, sizeof(ifr->ifr_name)); xioctl(fd, TUNSETIFF, toybuf); + if (toys.optflags&FLAG_t) { xioctl(fd, TUNSETPERSIST, (void *)1); xioctl(fd, TUNSETOWNER, (void *)(long)u); |