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tap-linux: Open ipvtap and macvtap

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ipvtap and macvtap create a file for each interface unlike tuntap, which
creates one file shared by all interfaces. Try to open a file dedicated
to the interface first for ipvtap and macvtap.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Akihiko Odaki 2024-10-08 15:52:06 +09:00 • committed by Jason Wang
parent 2938c36937
commit ac2ff9b840
1 changed files with 14 additions and 3 deletions
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11
net/tap-linux.c
View file

@ -45,11 +45,22 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
int len = sizeof(struct virtio_net_hdr); int len = sizeof(struct virtio_net_hdr);
unsigned int features; unsigned int features;
ret = if_nametoindex(ifname);
if (ret) {
g_autofree char *file = g_strdup_printf("/dev/tap%d", ret);
fd = open(file, O_RDWR);
} else {
fd = -1;
}
if (fd < 0) {
fd = RETRY_ON_EINTR(open(PATH_NET_TUN, O_RDWR)); fd = RETRY_ON_EINTR(open(PATH_NET_TUN, O_RDWR));
if (fd < 0) { if (fd < 0) {
error_setg_errno(errp, errno, "could not open %s", PATH_NET_TUN); error_setg_errno(errp, errno, "could not open %s", PATH_NET_TUN);
return -1; return -1;
} }
}
memset(&ifr, 0, sizeof(ifr)); memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI; ifr.ifr_flags = IFF_TAP | IFF_NO_PI;