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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "Michael S. Tsirkin" , Xuan Zhuo , Shuah Khan , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-kselftest@vger.kernel.org, Yuri Benditovich , Andrew Melnychenko , Stephen Hemminger , gur.stavi@huawei.com, devel@daynix.com, Akihiko Odaki Cc: Willem de Bruijn X-Mailer: b4 0.14.2 tun and tap implements the same vnet-related features so reuse the code. Signed-off-by: Akihiko Odaki Reviewed-by: Willem de Bruijn --- drivers/net/tap.c | 152 ++++++--------------------------------------------= ---- 1 file changed, 16 insertions(+), 136 deletions(-) diff --git a/drivers/net/tap.c b/drivers/net/tap.c index 8cb002616a6143b54258b65b483fed0c3af2c7a0..1287e241f4454fb8ec4975bbade= d5fbaa88e3cc8 100644 --- a/drivers/net/tap.c +++ b/drivers/net/tap.c @@ -26,74 +26,9 @@ #include #include =20 -#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 =3D !!(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 |=3D TAP_VNET_BE; - else - q->flags &=3D ~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" =20 -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) =20 static struct proto tap_proto =3D { .name =3D "tap", @@ -655,25 +590,13 @@ static ssize_t tap_get_user(struct tap_queue *q, void= *msg_control, if (q->flags & IFF_VNET_HDR) { vnet_hdr_len =3D READ_ONCE(q->vnet_hdr_sz); =20 - err =3D -EINVAL; - if (len < vnet_hdr_len) + hdr_len =3D tun_vnet_hdr_get(vnet_hdr_len, q->flags, from, &vnet_hdr); + if (hdr_len < 0) { + err =3D hdr_len; goto err; - len -=3D vnet_hdr_len; - - err =3D -EFAULT; - if (!copy_from_iter_full(&vnet_hdr, sizeof(vnet_hdr), from)) - goto err; - iov_iter_advance(from, vnet_hdr_len - sizeof(vnet_hdr)); - hdr_len =3D tap16_to_cpu(q, vnet_hdr.hdr_len); - if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { - hdr_len =3D max(tap16_to_cpu(q, vnet_hdr.csum_start) + - tap16_to_cpu(q, vnet_hdr.csum_offset) + 2, - hdr_len); - vnet_hdr.hdr_len =3D cpu_to_tap16(q, hdr_len); } - err =3D -EINVAL; - if (tap16_to_cpu(q, vnet_hdr.hdr_len) > len) - goto err; + + len -=3D vnet_hdr_len; } =20 err =3D -EINVAL; @@ -725,8 +648,7 @@ static ssize_t tap_get_user(struct tap_queue *q, void *= msg_control, skb->dev =3D tap->dev; =20 if (vnet_hdr_len) { - err =3D virtio_net_hdr_to_skb(skb, &vnet_hdr, - tap_is_little_endian(q)); + err =3D tun_vnet_hdr_to_skb(q->flags, skb, &vnet_hdr); if (err) { rcu_read_unlock(); drop_reason =3D SKB_DROP_REASON_DEV_HDR; @@ -789,23 +711,17 @@ static ssize_t tap_put_user(struct tap_queue *q, int total; =20 if (q->flags & IFF_VNET_HDR) { - int vlan_hlen =3D skb_vlan_tag_present(skb) ? VLAN_HLEN : 0; struct virtio_net_hdr vnet_hdr; =20 vnet_hdr_len =3D 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(); =20 - if (copy_to_iter(&vnet_hdr, sizeof(vnet_hdr), iter) !=3D - sizeof(vnet_hdr)) - return -EFAULT; + ret =3D tun_vnet_hdr_from_skb(q->flags, NULL, skb, &vnet_hdr); + if (ret) + return ret; =20 - iov_iter_advance(iter, vnet_hdr_len - sizeof(vnet_hdr)); + ret =3D tun_vnet_hdr_put(vnet_hdr_len, iter, &vnet_hdr); + if (ret) + return ret; } total =3D vnet_hdr_len; total +=3D skb->len; @@ -1064,42 +980,6 @@ static long tap_ioctl(struct file *file, unsigned int= cmd, q->sk.sk_sndbuf =3D s; return 0; =20 - case TUNGETVNETHDRSZ: - s =3D 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 =3D s; - return 0; - - case TUNGETVNETLE: - s =3D !!(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 |=3D TAP_VNET_LE; - else - q->flags &=3D ~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 | @@ -1143,7 +1023,7 @@ static long tap_ioctl(struct file *file, unsigned int= cmd, return ret; =20 default: - return -EINVAL; + return tun_vnet_ioctl(&q->vnet_hdr_sz, &q->flags, cmd, sp); } } =20 @@ -1190,7 +1070,7 @@ static int tap_get_user_xdp(struct tap_queue *q, stru= ct xdp_buff *xdp) skb->protocol =3D eth_hdr(skb)->h_proto; =20 if (vnet_hdr_len) { - err =3D virtio_net_hdr_to_skb(skb, gso, tap_is_little_endian(q)); + err =3D tun_vnet_hdr_to_skb(q->flags, skb, gso); if (err) goto err_kfree; } --=20 2.48.1