[9fans] tun/tap support for 9vx

[Tully Gray <tullygray@arc.net.au>]

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Hi,

I have modified Erik Quanstrom's raw socket ethernet driver
for 9vx so that it uses the Linux kernel's "tap" device.
It seems to work just fine. I create the tap device first
using "tunctl" which comes with the Usermode Linux toolkit
but I don't think this is necessary.

Tully Gray.

ps: I am shadowdaemon on IRC.

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12a13
> #include <linux/if_tun.h>
38d38
< 	int fd;
40a41
> 	int fd;
42c43
< 	if((fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0)
---
> 	if((fd = open("/dev/net/tun", O_RDWR)) < 0){
43a45,46
> 	}
>
45a49
> 		ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
47,55c51
< 		if(ioctl(fd, SIOCGIFINDEX, &ifr) < 0){
< 			close(fd);
< 			return -1;
< 		}
< 		memset(&sa, 0, sizeof sa);
< 		sa.sll_family = AF_PACKET;
< 		sa.sll_protocol = htons(ETH_P_ALL);
< 		sa.sll_ifindex = ifr.ifr_ifindex;
< 		if(bind(fd, (struct sockaddr*)&sa, sizeof sa) < 0){
---
> 		if(ioctl(fd, TUNSETIFF, &ifr) < 0){
61,71d56
< 	memset(&ifr, 0, sizeof ifr);
< 	strncpy(ifr.ifr_name, dev, sizeof ifr.ifr_name);
< 	if(ioctl(fd, SIOCGIFFLAGS, &ifr) < 0){
< 		close(fd);
< 		return -1;
< 	}
< 	ifr.ifr_flags |= IFF_PROMISC;
< 	if(ioctl(fd, SIOCSIFFLAGS, &ifr) < 0){
< 		close(fd);
< 		return -1;
< 	}
149c134
< 	0x00, 0x48, 0x01, 0x23, 0x45, 0x61,
---
> //	0x00, 0x48, 0x01, 0x23, 0x45, 0x61,
158c143
< 	"eth1", "eth0", "eth2", "eth3", "eth4", "eth5",
---
> 	"tap0",