summaryrefslogtreecommitdiffstats
path: root/net/packet/af_packet.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/packet/af_packet.c')
-rw-r--r--net/packet/af_packet.c239
1 files changed, 192 insertions, 47 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index e0516a22be2e..6ecb426bc0cf 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -80,6 +80,7 @@
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/if_vlan.h>
+#include <linux/virtio_net.h>
#ifdef CONFIG_INET
#include <net/inet_common.h>
@@ -156,7 +157,6 @@ struct packet_mreq_max {
unsigned char mr_address[MAX_ADDR_LEN];
};
-#ifdef CONFIG_PACKET_MMAP
static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
int closing, int tx_ring);
@@ -176,7 +176,6 @@ struct packet_ring_buffer {
struct packet_sock;
static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
-#endif
static void packet_flush_mclist(struct sock *sk);
@@ -184,26 +183,23 @@ struct packet_sock {
/* struct sock has to be the first member of packet_sock */
struct sock sk;
struct tpacket_stats stats;
-#ifdef CONFIG_PACKET_MMAP
struct packet_ring_buffer rx_ring;
struct packet_ring_buffer tx_ring;
int copy_thresh;
-#endif
spinlock_t bind_lock;
struct mutex pg_vec_lock;
unsigned int running:1, /* prot_hook is attached*/
auxdata:1,
- origdev:1;
+ origdev:1,
+ has_vnet_hdr:1;
int ifindex; /* bound device */
__be16 num;
struct packet_mclist *mclist;
-#ifdef CONFIG_PACKET_MMAP
atomic_t mapped;
enum tpacket_versions tp_version;
unsigned int tp_hdrlen;
unsigned int tp_reserve;
unsigned int tp_loss:1;
-#endif
struct packet_type prot_hook ____cacheline_aligned_in_smp;
};
@@ -217,8 +213,6 @@ struct packet_skb_cb {
#define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
-#ifdef CONFIG_PACKET_MMAP
-
static void __packet_set_status(struct packet_sock *po, void *frame, int status)
{
union {
@@ -313,8 +307,6 @@ static inline void packet_increment_head(struct packet_ring_buffer *buff)
buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
}
-#endif
-
static inline struct packet_sock *pkt_sk(struct sock *sk)
{
return (struct packet_sock *)sk;
@@ -638,7 +630,6 @@ drop:
return 0;
}
-#ifdef CONFIG_PACKET_MMAP
static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
@@ -1021,8 +1012,20 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
status = TP_STATUS_SEND_REQUEST;
err = dev_queue_xmit(skb);
- if (unlikely(err > 0 && (err = net_xmit_errno(err)) != 0))
- goto out_xmit;
+ if (unlikely(err > 0)) {
+ err = net_xmit_errno(err);
+ if (err && __packet_get_status(po, ph) ==
+ TP_STATUS_AVAILABLE) {
+ /* skb was destructed already */
+ skb = NULL;
+ goto out_status;
+ }
+ /*
+ * skb was dropped but not destructed yet;
+ * let's treat it like congestion or err < 0
+ */
+ err = 0;
+ }
packet_increment_head(&po->tx_ring);
len_sum += tp_len;
} while (likely((ph != NULL) ||
@@ -1033,9 +1036,6 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
err = len_sum;
goto out_put;
-out_xmit:
- skb->destructor = sock_wfree;
- atomic_dec(&po->tx_ring.pending);
out_status:
__packet_set_status(po, ph, status);
kfree_skb(skb);
@@ -1045,7 +1045,30 @@ out:
mutex_unlock(&po->pg_vec_lock);
return err;
}
-#endif
+
+static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
+ size_t reserve, size_t len,
+ size_t linear, int noblock,
+ int *err)
+{
+ struct sk_buff *skb;
+
+ /* Under a page? Don't bother with paged skb. */
+ if (prepad + len < PAGE_SIZE || !linear)
+ linear = len;
+
+ skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
+ err);
+ if (!skb)
+ return NULL;
+
+ skb_reserve(skb, reserve);
+ skb_put(skb, linear);
+ skb->data_len = len - linear;
+ skb->len += len - linear;
+
+ return skb;
+}
static int packet_snd(struct socket *sock,
struct msghdr *msg, size_t len)
@@ -1057,14 +1080,17 @@ static int packet_snd(struct socket *sock,
__be16 proto;
unsigned char *addr;
int ifindex, err, reserve = 0;
+ struct virtio_net_hdr vnet_hdr = { 0 };
+ int offset = 0;
+ int vnet_hdr_len;
+ struct packet_sock *po = pkt_sk(sk);
+ unsigned short gso_type = 0;
/*
* Get and verify the address.
*/
if (saddr == NULL) {
- struct packet_sock *po = pkt_sk(sk);
-
ifindex = po->ifindex;
proto = po->num;
addr = NULL;
@@ -1091,25 +1117,74 @@ static int packet_snd(struct socket *sock,
if (!(dev->flags & IFF_UP))
goto out_unlock;
+ if (po->has_vnet_hdr) {
+ vnet_hdr_len = sizeof(vnet_hdr);
+
+ err = -EINVAL;
+ if (len < vnet_hdr_len)
+ goto out_unlock;
+
+ len -= vnet_hdr_len;
+
+ err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov,
+ vnet_hdr_len);
+ if (err < 0)
+ goto out_unlock;
+
+ if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
+ (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
+ vnet_hdr.hdr_len))
+ vnet_hdr.hdr_len = vnet_hdr.csum_start +
+ vnet_hdr.csum_offset + 2;
+
+ err = -EINVAL;
+ if (vnet_hdr.hdr_len > len)
+ goto out_unlock;
+
+ if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
+ switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
+ case VIRTIO_NET_HDR_GSO_TCPV4:
+ gso_type = SKB_GSO_TCPV4;
+ break;
+ case VIRTIO_NET_HDR_GSO_TCPV6:
+ gso_type = SKB_GSO_TCPV6;
+ break;
+ case VIRTIO_NET_HDR_GSO_UDP:
+ gso_type = SKB_GSO_UDP;
+ break;
+ default:
+ goto out_unlock;
+ }
+
+ if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
+ gso_type |= SKB_GSO_TCP_ECN;
+
+ if (vnet_hdr.gso_size == 0)
+ goto out_unlock;
+
+ }
+ }
+
err = -EMSGSIZE;
- if (len > dev->mtu+reserve)
+ if (!gso_type && (len > dev->mtu+reserve))
goto out_unlock;
- skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev),
- msg->msg_flags & MSG_DONTWAIT, &err);
+ err = -ENOBUFS;
+ skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev),
+ LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len,
+ msg->msg_flags & MSG_DONTWAIT, &err);
if (skb == NULL)
goto out_unlock;
- skb_reserve(skb, LL_RESERVED_SPACE(dev));
- skb_reset_network_header(skb);
+ skb_set_network_header(skb, reserve);
err = -EINVAL;
if (sock->type == SOCK_DGRAM &&
- dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len) < 0)
+ (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
goto out_free;
/* Returns -EFAULT on error */
- err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
+ err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
if (err)
goto out_free;
@@ -1118,6 +1193,25 @@ static int packet_snd(struct socket *sock,
skb->priority = sk->sk_priority;
skb->mark = sk->sk_mark;
+ if (po->has_vnet_hdr) {
+ if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
+ if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
+ vnet_hdr.csum_offset)) {
+ err = -EINVAL;
+ goto out_free;
+ }
+ }
+
+ skb_shinfo(skb)->gso_size = vnet_hdr.gso_size;
+ skb_shinfo(skb)->gso_type = gso_type;
+
+ /* Header must be checked, and gso_segs computed. */
+ skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
+ skb_shinfo(skb)->gso_segs = 0;
+
+ len += vnet_hdr_len;
+ }
+
/*
* Now send it
*/
@@ -1142,13 +1236,11 @@ out:
static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t len)
{
-#ifdef CONFIG_PACKET_MMAP
struct sock *sk = sock->sk;
struct packet_sock *po = pkt_sk(sk);
if (po->tx_ring.pg_vec)
return tpacket_snd(po, msg);
else
-#endif
return packet_snd(sock, msg, len);
}
@@ -1162,9 +1254,7 @@ static int packet_release(struct socket *sock)
struct sock *sk = sock->sk;
struct packet_sock *po;
struct net *net;
-#ifdef CONFIG_PACKET_MMAP
struct tpacket_req req;
-#endif
if (!sk)
return 0;
@@ -1193,7 +1283,6 @@ static int packet_release(struct socket *sock)
packet_flush_mclist(sk);
-#ifdef CONFIG_PACKET_MMAP
memset(&req, 0, sizeof(req));
if (po->rx_ring.pg_vec)
@@ -1201,7 +1290,6 @@ static int packet_release(struct socket *sock)
if (po->tx_ring.pg_vec)
packet_set_ring(sk, &req, 1, 1);
-#endif
/*
* Now the socket is dead. No more input will appear.
@@ -1411,6 +1499,7 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
struct sk_buff *skb;
int copied, err;
struct sockaddr_ll *sll;
+ int vnet_hdr_len = 0;
err = -EINVAL;
if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
@@ -1442,6 +1531,48 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
if (skb == NULL)
goto out;
+ if (pkt_sk(sk)->has_vnet_hdr) {
+ struct virtio_net_hdr vnet_hdr = { 0 };
+
+ err = -EINVAL;
+ vnet_hdr_len = sizeof(vnet_hdr);
+ if ((len -= vnet_hdr_len) < 0)
+ goto out_free;
+
+ if (skb_is_gso(skb)) {
+ struct skb_shared_info *sinfo = skb_shinfo(skb);
+
+ /* This is a hint as to how much should be linear. */
+ vnet_hdr.hdr_len = skb_headlen(skb);
+ vnet_hdr.gso_size = sinfo->gso_size;
+ if (sinfo->gso_type & SKB_GSO_TCPV4)
+ vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
+ else if (sinfo->gso_type & SKB_GSO_TCPV6)
+ vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
+ else if (sinfo->gso_type & SKB_GSO_UDP)
+ vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
+ else if (sinfo->gso_type & SKB_GSO_FCOE)
+ goto out_free;
+ else
+ BUG();
+ if (sinfo->gso_type & SKB_GSO_TCP_ECN)
+ vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
+ } else
+ vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL) {
+ vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ vnet_hdr.csum_start = skb->csum_start -
+ skb_headroom(skb);
+ vnet_hdr.csum_offset = skb->csum_offset;
+ } /* else everything is zero */
+
+ err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr,
+ vnet_hdr_len);
+ if (err < 0)
+ goto out_free;
+ }
+
/*
* If the address length field is there to be filled in, we fill
* it in now.
@@ -1493,7 +1624,7 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
* Free or return the buffer as appropriate. Again this
* hides all the races and re-entrancy issues from us.
*/
- err = (flags&MSG_TRUNC) ? skb->len : copied;
+ err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
out_free:
skb_free_datagram(sk, skb);
@@ -1723,7 +1854,6 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
return ret;
}
-#ifdef CONFIG_PACKET_MMAP
case PACKET_RX_RING:
case PACKET_TX_RING:
{
@@ -1731,6 +1861,8 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
if (optlen < sizeof(req))
return -EINVAL;
+ if (pkt_sk(sk)->has_vnet_hdr)
+ return -EINVAL;
if (copy_from_user(&req, optval, sizeof(req)))
return -EFAULT;
return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
@@ -1792,7 +1924,6 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
po->tp_loss = !!val;
return 0;
}
-#endif
case PACKET_AUXDATA:
{
int val;
@@ -1817,6 +1948,22 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
po->origdev = !!val;
return 0;
}
+ case PACKET_VNET_HDR:
+ {
+ int val;
+
+ if (sock->type != SOCK_RAW)
+ return -EINVAL;
+ if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
+ return -EBUSY;
+ if (optlen < sizeof(val))
+ return -EINVAL;
+ if (copy_from_user(&val, optval, sizeof(val)))
+ return -EFAULT;
+
+ po->has_vnet_hdr = !!val;
+ return 0;
+ }
default:
return -ENOPROTOOPT;
}
@@ -1867,7 +2014,13 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
data = &val;
break;
-#ifdef CONFIG_PACKET_MMAP
+ case PACKET_VNET_HDR:
+ if (len > sizeof(int))
+ len = sizeof(int);
+ val = po->has_vnet_hdr;
+
+ data = &val;
+ break;
case PACKET_VERSION:
if (len > sizeof(int))
len = sizeof(int);
@@ -1903,7 +2056,6 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
val = po->tp_loss;
data = &val;
break;
-#endif
default:
return -ENOPROTOOPT;
}
@@ -2023,11 +2175,6 @@ static int packet_ioctl(struct socket *sock, unsigned int cmd,
return 0;
}
-#ifndef CONFIG_PACKET_MMAP
-#define packet_mmap sock_no_mmap
-#define packet_poll datagram_poll
-#else
-
static unsigned int packet_poll(struct file *file, struct socket *sock,
poll_table *wait)
{
@@ -2309,8 +2456,6 @@ out:
mutex_unlock(&po->pg_vec_lock);
return err;
}
-#endif
-
static const struct proto_ops packet_ops_spkt = {
.family = PF_PACKET,
@@ -2448,7 +2593,7 @@ static const struct file_operations packet_seq_fops = {
#endif
-static int packet_net_init(struct net *net)
+static int __net_init packet_net_init(struct net *net)
{
rwlock_init(&net->packet.sklist_lock);
INIT_HLIST_HEAD(&net->packet.sklist);
@@ -2459,7 +2604,7 @@ static int packet_net_init(struct net *net)
return 0;
}
-static void packet_net_exit(struct net *net)
+static void __net_exit packet_net_exit(struct net *net)
{
proc_net_remove(net, "packet");
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-20 11:20:01 +0100