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authorRusty Russell <rusty@rustcorp.com.au>2008-07-03 06:45:32 -0400
committerDavid S. Miller <davem@davemloft.net>2008-07-03 06:45:32 -0400
commit07240fd0902c872f044f523893364a1a24c9f278 (patch)
tree096286005c0b1a19c23011b3c7418710704b833e /drivers/net/tun.c
parent44d28ab19c64d095314ac66f765d0c747519f4ed (diff)
tun: Interface to query tun/tap features.
The problem with introducing checksum offload and gso to tun is they need to set dev->features to enable GSO and/or checksumming, which is supposed to be done before register_netdevice(), ie. as part of TUNSETIFF. Unfortunately, TUNSETIFF has always just ignored flags it doesn't understand, so there's no good way of detecting whether the kernel supports new IFF_ flags. This patch implements a TUNGETFEATURES ioctl which returns all the valid IFF flags. It could be extended later to include other features. Here's an example program which uses it: #include <linux/if_tun.h> #include <sys/types.h> #include <sys/ioctl.h> #include <sys/stat.h> #include <fcntl.h> #include <err.h> #include <stdio.h> static struct { unsigned int flag; const char *name; } known_flags[] = { { IFF_TUN, "TUN" }, { IFF_TAP, "TAP" }, { IFF_NO_PI, "NO_PI" }, { IFF_ONE_QUEUE, "ONE_QUEUE" }, }; int main() { unsigned int features, i; int netfd = open("/dev/net/tun", O_RDWR); if (netfd < 0) err(1, "Opening /dev/net/tun"); if (ioctl(netfd, TUNGETFEATURES, &features) != 0) { printf("Kernel does not support TUNGETFEATURES, guessing\n"); features = (IFF_TUN|IFF_TAP|IFF_NO_PI|IFF_ONE_QUEUE); } printf("Available features are: "); for (i = 0; i < sizeof(known_flags)/sizeof(known_flags[0]); i++) { if (features & known_flags[i].flag) { features &= ~known_flags[i].flag; printf("%s ", known_flags[i].name); } } if (features) printf("(UNKNOWN %#x)", features); printf("\n"); return 0; } Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Max Krasnyansky <maxk@qualcomm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 7ab94c825b57..3bb991fd2b51 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -640,6 +640,14 @@ static int tun_chr_ioctl(struct inode *inode, struct file *file,
640 return 0; 640 return 0;
641 } 641 }
642 642
643 if (cmd == TUNGETFEATURES) {
644 /* Currently this just means: "what IFF flags are valid?".
645 * This is needed because we never checked for invalid flags on
646 * TUNSETIFF. */
647 return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE,
648 (unsigned int __user*)argp);
649 }
650
643 if (!tun) 651 if (!tun)
644 return -EBADFD; 652 return -EBADFD;
645 653