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| author | Richard Cochran <richardcochran@gmail.com> | 2010-04-07 22:41:28 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-04-13 01:30:48 -0700 |
| commit | ed85b565b825566da34e55eee9ad150ed93fdda0 (patch) | |
| tree | 77b9bad66d0cd6a1b7c657995100d555b8ecb9eb /net/packet | |
| parent | 7d53b80980a598836c56517290b29aa7b0766ef8 (diff) | |
| download | linux-ed85b565b825566da34e55eee9ad150ed93fdda0.tar.gz linux-ed85b565b825566da34e55eee9ad150ed93fdda0.tar.bz2 linux-ed85b565b825566da34e55eee9ad150ed93fdda0.zip | |
packet: support for TX time stamps on RAW sockets
Enable the SO_TIMESTAMPING socket infrastructure for raw packet sockets.
We introduce PACKET_TX_TIMESTAMP for the control message cmsg_type.
Similar support for UDP and CAN sockets was added in commit
51f31cabe3ce5345b51e4a4f82138b38c4d5dc91
Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet')
| -rw-r--r-- | net/packet/af_packet.c | 61 |
1 files changed, 60 insertions, 1 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index d7d0310dca9d..f162d59d8161 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -82,6 +82,7 @@ #include <linux/mutex.h> #include <linux/if_vlan.h> #include <linux/virtio_net.h> +#include <linux/errqueue.h> #ifdef CONFIG_INET #include <net/inet_common.h> @@ -315,6 +316,8 @@ static inline struct packet_sock *pkt_sk(struct sock *sk) static void packet_sock_destruct(struct sock *sk) { + skb_queue_purge(&sk->sk_error_queue); + WARN_ON(atomic_read(&sk->sk_rmem_alloc)); WARN_ON(atomic_read(&sk->sk_wmem_alloc)); @@ -483,6 +486,9 @@ retry: skb->dev = dev; skb->priority = sk->sk_priority; skb->mark = sk->sk_mark; + err = sock_tx_timestamp(msg, sk, skb_tx(skb)); + if (err < 0) + goto out_unlock; dev_queue_xmit(skb); rcu_read_unlock(); @@ -1188,6 +1194,9 @@ static int packet_snd(struct socket *sock, err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len); if (err) goto out_free; + err = sock_tx_timestamp(msg, sk, skb_tx(skb)); + if (err < 0) + goto out_free; skb->protocol = proto; skb->dev = dev; @@ -1487,6 +1496,51 @@ out: return err; } +static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len) +{ + struct sock_exterr_skb *serr; + struct sk_buff *skb, *skb2; + int copied, err; + + err = -EAGAIN; + skb = skb_dequeue(&sk->sk_error_queue); + if (skb == NULL) + goto out; + + copied = skb->len; + if (copied > len) { + msg->msg_flags |= MSG_TRUNC; + copied = len; + } + err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); + if (err) + goto out_free_skb; + + sock_recv_timestamp(msg, sk, skb); + + serr = SKB_EXT_ERR(skb); + put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP, + sizeof(serr->ee), &serr->ee); + + msg->msg_flags |= MSG_ERRQUEUE; + err = copied; + + /* Reset and regenerate socket error */ + spin_lock_bh(&sk->sk_error_queue.lock); + sk->sk_err = 0; + if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { + sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; + spin_unlock_bh(&sk->sk_error_queue.lock); + sk->sk_error_report(sk); + } else + spin_unlock_bh(&sk->sk_error_queue.lock); + +out_free_skb: + kfree_skb(skb); +out: + return err; +} + /* * Pull a packet from our receive queue and hand it to the user. * If necessary we block. @@ -1502,7 +1556,7 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, int vnet_hdr_len = 0; err = -EINVAL; - if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) + if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE)) goto out; #if 0 @@ -1511,6 +1565,11 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, return -ENODEV; #endif + if (flags & MSG_ERRQUEUE) { + err = packet_recv_error(sk, msg, len); + goto out; + } + /* * Call the generic datagram receiver. This handles all sorts * of horrible races and re-entrancy so we can forget about it |