tun and tap implements the same vnet-related features so reuse the code.
Signed-off-by: Akihiko Odaki <akihiko.odaki@xxxxxxxxxx>
---
drivers/net/Kconfig | 1 +
drivers/net/tap.c | 152 ++++++----------------------------------------------
2 files changed, 16 insertions(+), 137 deletions(-)
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 924bf61f12a49566b26a78f42cea5ca1c48537c5..f8aa35bf8a93ac1c7f76b85919ac110cb06f21fb 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -421,6 +421,7 @@ config TUN
config TAP
tristate
+ select TUN_VNET
help
This option is selected by any driver implementing tap user space
interface for a virtual interface to re-use core tap functionality.
diff --git a/drivers/net/tap.c b/drivers/net/tap.c
index 7ee2e9ee2a89fd539b087496b92d2f6198266f44..4f3cc3b2e3c6fb387ee2aaeef54c3faf39d90f10 100644
--- a/drivers/net/tap.c
+++ b/drivers/net/tap.c
@@ -26,74 +26,9 @@
#include <linux/virtio_net.h>
#include <linux/skb_array.h>
-#define TAP_IFFEATURES (IFF_VNET_HDR | IFF_MULTI_QUEUE)
-
-#define TAP_VNET_LE 0x80000000
-#define TAP_VNET_BE 0x40000000
-
-#ifdef CONFIG_TUN_VNET_CROSS_LE
-static inline bool tap_legacy_is_little_endian(struct tap_queue *q)
-{
- return q->flags & TAP_VNET_BE ? false :
- virtio_legacy_is_little_endian();
-}
-
-static long tap_get_vnet_be(struct tap_queue *q, int __user *sp)
-{
- int s = !!(q->flags & TAP_VNET_BE);
-
- if (put_user(s, sp))
- return -EFAULT;
-
- return 0;
-}
-
-static long tap_set_vnet_be(struct tap_queue *q, int __user *sp)
-{
- int s;
-
- if (get_user(s, sp))
- return -EFAULT;
-
- if (s)
- q->flags |= TAP_VNET_BE;
- else
- q->flags &= ~TAP_VNET_BE;
-
- return 0;
-}
-#else
-static inline bool tap_legacy_is_little_endian(struct tap_queue *q)
-{
- return virtio_legacy_is_little_endian();
-}
-
-static long tap_get_vnet_be(struct tap_queue *q, int __user *argp)
-{
- return -EINVAL;
-}
-
-static long tap_set_vnet_be(struct tap_queue *q, int __user *argp)
-{
- return -EINVAL;
-}
-#endif /* CONFIG_TUN_VNET_CROSS_LE */
-
-static inline bool tap_is_little_endian(struct tap_queue *q)
-{
- return q->flags & TAP_VNET_LE ||
- tap_legacy_is_little_endian(q);
-}
-
-static inline u16 tap16_to_cpu(struct tap_queue *q, __virtio16 val)
-{
- return __virtio16_to_cpu(tap_is_little_endian(q), val);
-}
+#include "tun_vnet.h"
-static inline __virtio16 cpu_to_tap16(struct tap_queue *q, u16 val)
-{
- return __cpu_to_virtio16(tap_is_little_endian(q), val);
-}
+#define TAP_IFFEATURES (IFF_VNET_HDR | IFF_MULTI_QUEUE)
static struct proto tap_proto = {
.name = "tap",
@@ -655,25 +590,11 @@ static ssize_t tap_get_user(struct tap_queue *q, void *msg_control,
if (q->flags & IFF_VNET_HDR) {
vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz);
- err = -EINVAL;
- if (iov_iter_count(from) < vnet_hdr_len)
- goto err;
-
- err = -EFAULT;
- if (!copy_from_iter_full(&vnet_hdr, sizeof(vnet_hdr), from))
- goto err;
- iov_iter_advance(from, vnet_hdr_len - sizeof(vnet_hdr));
- if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
- tap16_to_cpu(q, vnet_hdr.csum_start) +
- tap16_to_cpu(q, vnet_hdr.csum_offset) + 2 >
- tap16_to_cpu(q, vnet_hdr.hdr_len))
- vnet_hdr.hdr_len = cpu_to_tap16(q,
- tap16_to_cpu(q, vnet_hdr.csum_start) +
- tap16_to_cpu(q, vnet_hdr.csum_offset) + 2);
- err = -EINVAL;
- if (tap16_to_cpu(q, vnet_hdr.hdr_len) > iov_iter_count(from))
+ hdr_len = tun_vnet_hdr_get(vnet_hdr_len, q->flags, from, &vnet_hdr);
+ if (hdr_len < 0) {
+ err = hdr_len;
goto err;
- hdr_len = tap16_to_cpu(q, vnet_hdr.hdr_len);
+ }
}
len = iov_iter_count(from);
@@ -731,8 +652,7 @@ static ssize_t tap_get_user(struct tap_queue *q, void *msg_control,
skb->dev = tap->dev;
if (vnet_hdr_len) {
- err = virtio_net_hdr_to_skb(skb, &vnet_hdr,
- tap_is_little_endian(q));
+ err = tun_vnet_hdr_to_skb(q->flags, skb, &vnet_hdr);
if (err) {
rcu_read_unlock();
drop_reason = SKB_DROP_REASON_DEV_HDR;
@@ -795,23 +715,17 @@ static ssize_t tap_put_user(struct tap_queue *q,
int total;
if (q->flags & IFF_VNET_HDR) {
- int vlan_hlen = skb_vlan_tag_present(skb) ? VLAN_HLEN : 0;
struct virtio_net_hdr vnet_hdr;
vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz);
- if (iov_iter_count(iter) < vnet_hdr_len)
- return -EINVAL;
- if (virtio_net_hdr_from_skb(skb, &vnet_hdr,
- tap_is_little_endian(q), true,
- vlan_hlen))
- BUG();
-
- if (copy_to_iter(&vnet_hdr, sizeof(vnet_hdr), iter) !=
- sizeof(vnet_hdr))
- return -EFAULT;
+ ret = tun_vnet_hdr_from_skb(q->flags, NULL, skb, &vnet_hdr);
+ if (ret)
+ return ret;
- iov_iter_advance(iter, vnet_hdr_len - sizeof(vnet_hdr));
+ ret = tun_vnet_hdr_put(vnet_hdr_len, iter, &vnet_hdr);
+ if (ret)
+ return ret;
}
total = vnet_hdr_len;
total += skb->len;
@@ -1070,42 +984,6 @@ static long tap_ioctl(struct file *file, unsigned int cmd,
q->sk.sk_sndbuf = s;
return 0;
- case TUNGETVNETHDRSZ:
- s = q->vnet_hdr_sz;
- if (put_user(s, sp))
- return -EFAULT;
- return 0;
-
- case TUNSETVNETHDRSZ:
- if (get_user(s, sp))
- return -EFAULT;
- if (s < (int)sizeof(struct virtio_net_hdr))
- return -EINVAL;
-
- q->vnet_hdr_sz = s;
- return 0;
-
- case TUNGETVNETLE:
- s = !!(q->flags & TAP_VNET_LE);
- if (put_user(s, sp))
- return -EFAULT;
- return 0;
-
- case TUNSETVNETLE:
- if (get_user(s, sp))
- return -EFAULT;
- if (s)
- q->flags |= TAP_VNET_LE;
- else
- q->flags &= ~TAP_VNET_LE;
- return 0;
-
- case TUNGETVNETBE:
- return tap_get_vnet_be(q, sp);
-
- case TUNSETVNETBE:
- return tap_set_vnet_be(q, sp);
-
case TUNSETOFFLOAD:
/* let the user check for future flags */
if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 |
@@ -1149,7 +1027,7 @@ static long tap_ioctl(struct file *file, unsigned int cmd,
return ret;
default:
- return -EINVAL;
+ return tun_vnet_ioctl(&q->vnet_hdr_sz, &q->flags, cmd, sp);
}
}
@@ -1196,7 +1074,7 @@ static int tap_get_user_xdp(struct tap_queue *q, struct xdp_buff *xdp)
skb->protocol = eth_hdr(skb)->h_proto;
if (vnet_hdr_len) {
- err = virtio_net_hdr_to_skb(skb, gso, tap_is_little_endian(q));
+ err = tun_vnet_hdr_to_skb(q->flags, skb, gso);
if (err)
goto err_kfree;
}
--
2.47.1
