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ip: support for TX timestamps on UDP and RAW sockets

Browse source 
Instructions for time stamping outgoing packets are take from the
socket layer and later copied into the new skb.

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick Ohly 2009-02-12 05:03:39 +00:00 committed by David S. Miller
parent 20d4947353
commit 51f31cabe3
7 changed files with 19 additions and 0 deletions
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2
Documentation/networking/timestamping.txt
View file

@ -56,6 +56,8 @@ and including the link layer, the scm_timestamping control message and
a sock_extended_err control message with ee_errno==ENOMSG and
ee_origin==SO_EE_ORIGIN_TIMESTAMPING. A socket with such a pending
bounced packet is ready for reading as far as select() is concerned.
If the outgoing packet has to be fragmented, then only the first
fragment is time stamped and returned to the sending socket.
All three values correspond to the same event in time, but were
generated in different ways. Each of these values may be empty (= all

1
include/net/ip.h
View file

@ -55,6 +55,7 @@ struct ipcm_cookie
__be32 addr;
int oif;
struct ip_options *opt;
union skb_shared_tx shtx;
};
#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))

3
net/can/raw.c
View file

@ -646,6 +646,9 @@ static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
goto put_dev;
err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
if (err < 0)
goto free_skb;
err = sock_tx_timestamp(msg, sk, skb_tx(skb));
if (err < 0)
goto free_skb;
skb->dev = dev;

2
net/ipv4/icmp.c
View file

@ -375,6 +375,7 @@ static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)
inet->tos = ip_hdr(skb)->tos;
daddr = ipc.addr = rt->rt_src;
ipc.opt = NULL;
ipc.shtx.flags = 0;
if (icmp_param->replyopts.optlen) {
ipc.opt = &icmp_param->replyopts;
if (ipc.opt->srr)
@ -532,6 +533,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
inet_sk(sk)->tos = tos;
ipc.addr = iph->saddr;
ipc.opt = &icmp_param.replyopts;
ipc.shtx.flags = 0;
{
struct flowi fl = {

6
net/ipv4/ip_output.c
View file

@ -935,6 +935,10 @@ alloc_new_skb:
sk->sk_allocation);
if (unlikely(skb == NULL))
err = -ENOBUFS;
else
/* only the initial fragment is
time stamped */
ipc->shtx.flags = 0;
}
if (skb == NULL)
goto error;
@ -945,6 +949,7 @@ alloc_new_skb:
skb->ip_summed = csummode;
skb->csum = 0;
skb_reserve(skb, hh_len);
*skb_tx(skb) = ipc->shtx;
/*
* Find where to start putting bytes.
@ -1364,6 +1369,7 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
daddr = ipc.addr = rt->rt_src;
ipc.opt = NULL;
ipc.shtx.flags = 0;
if (replyopts.opt.optlen) {
ipc.opt = &replyopts.opt;

1
net/ipv4/raw.c
View file

@ -493,6 +493,7 @@ static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
ipc.addr = inet->saddr;
ipc.opt = NULL;
ipc.shtx.flags = 0;
ipc.oif = sk->sk_bound_dev_if;
if (msg->msg_controllen) {

4
net/ipv4/udp.c
View file

@ -596,6 +596,7 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
return -EOPNOTSUPP;
ipc.opt = NULL;
ipc.shtx.flags = 0;
if (up->pending) {
/*
@ -643,6 +644,9 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
ipc.addr = inet->saddr;
ipc.oif = sk->sk_bound_dev_if;
err = sock_tx_timestamp(msg, sk, &ipc.shtx);
if (err)
return err;
if (msg->msg_controllen) {
err = ip_cmsg_send(sock_net(sk), msg, &ipc);
if (err)