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[NET]: Fix packet timestamping.

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I've found the problem in general.  It affects any 64-bit
architecture.  The problem occurs when you change the system time.

Suppose that when you boot your system clock is forward by a day.
This gets recorded down in skb_tv_base.  You then wind the clock back
by a day.  From that point onwards the offset will be negative which
essentially overflows the 32-bit variables they're stored in.

In fact, why don't we just store the real time stamp in those 32-bit
variables? After all, we're not going to overflow for quite a while
yet.

When we do overflow, we'll need a better solution of course.

Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Herbert Xu 2005-10-03 13:57:23 -07:00 • committed by David S. Miller
commit 325ed82393
8 changed files with 15 additions and 26 deletions
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4
net/ipv4/netfilter/ip_queue.c
View file

@ -240,8 +240,8 @@ ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
pmsg->packet_id = (unsigned long )entry;
pmsg->data_len = data_len;
pmsg->timestamp_sec = skb_tv_base.tv_sec + entry->skb->tstamp.off_sec;
pmsg->timestamp_usec = skb_tv_base.tv_usec + entry->skb->tstamp.off_usec;
pmsg->timestamp_sec = entry->skb->tstamp.off_sec;
pmsg->timestamp_usec = entry->skb->tstamp.off_usec;
pmsg->mark = entry->skb->nfmark;
pmsg->hook = entry->info->hook;
pmsg->hw_protocol = entry->skb->protocol;

4
net/ipv4/netfilter/ipt_ULOG.c
View file

@ -225,8 +225,8 @@ static void ipt_ulog_packet(unsigned int hooknum,
/* copy hook, prefix, timestamp, payload, etc. */
pm->data_len = copy_len;
pm->timestamp_sec = skb_tv_base.tv_sec + skb->tstamp.off_sec;
pm->timestamp_usec = skb_tv_base.tv_usec + skb->tstamp.off_usec;
pm->timestamp_sec = skb->tstamp.off_sec;
pm->timestamp_usec = skb->tstamp.off_usec;
pm->mark = skb->nfmark;
pm->hook = hooknum;
if (prefix != NULL)