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net: ipv4: Convert IP network timestamps to be y2038 safe

Browse source 
ICMP timestamp messages and IP source route options require
timestamps to be in milliseconds modulo 24 hours from
midnight UT format.

Add inet_current_timestamp() function to support this. The function
returns the required timestamp in network byte order.

Timestamp calculation is also changed to call ktime_get_real_ts64()
which uses struct timespec64. struct timespec64 is y2038 safe.
Previously it called getnstimeofday() which uses struct timespec.
struct timespec is not y2038 safe.

Signed-off-by: Deepa Dinamani <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Alexey Kuznetsov <[email protected]>
Cc: Hideaki YOSHIFUJI <[email protected]>
Cc: James Morris <[email protected]>
Cc: Patrick McHardy <[email protected]>
Acked-by: YOSHIFUJI Hideaki <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Deepa Dinamani 2016-02-27 00:32:15 -08:00 • committed by David S. Miller
commit 822c868532
4 changed files with 35 additions and 12 deletions
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26
net/ipv4/af_inet.c
View file

@ -1380,6 +1380,32 @@ out:
return pp;
}
#define SECONDS_PER_DAY 86400
/* inet_current_timestamp - Return IP network timestamp
*
* Return milliseconds since midnight in network byte order.
*/
__be32 inet_current_timestamp(void)
{
u32 secs;
u32 msecs;
struct timespec64 ts;
ktime_get_real_ts64(&ts);
/* Get secs since midnight. */
(void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
/* Convert to msecs. */
msecs = secs * MSEC_PER_SEC;
/* Convert nsec to msec. */
msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
/* Convert to network byte order. */
return htons(msecs);
}
EXPORT_SYMBOL(inet_current_timestamp);
int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
{
if (sk->sk_family == AF_INET)

5
net/ipv4/icmp.c
View file

@ -931,7 +931,6 @@ static bool icmp_echo(struct sk_buff *skb)
*/
static bool icmp_timestamp(struct sk_buff *skb)
{
struct timespec tv;
struct icmp_bxm icmp_param;
/*
* Too short.
@ -942,9 +941,7 @@ static bool icmp_timestamp(struct sk_buff *skb)
/*
* Fill in the current time as ms since midnight UT:
*/
getnstimeofday(&tv);
icmp_param.data.times[1] = htonl((tv.tv_sec % 86400) * MSEC_PER_SEC +
tv.tv_nsec / NSEC_PER_MSEC);
icmp_param.data.times[1] = inet_current_timestamp();
icmp_param.data.times[2] = icmp_param.data.times[1];
if (skb_copy_bits(skb, 0, &icmp_param.data.times[0], 4))
BUG();

14
net/ipv4/ip_options.c
View file

@ -58,10 +58,9 @@ void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
if (opt->ts_needaddr)
ip_rt_get_source(iph+opt->ts+iph[opt->ts+2]-9, skb, rt);
if (opt->ts_needtime) {
struct timespec tv;
__be32 midtime;
getnstimeofday(&tv);
midtime = htonl((tv.tv_sec % 86400) * MSEC_PER_SEC + tv.tv_nsec / NSEC_PER_MSEC);
midtime = inet_current_timestamp();
memcpy(iph+opt->ts+iph[opt->ts+2]-5, &midtime, 4);
}
return;
@ -415,11 +414,10 @@ int ip_options_compile(struct net *net,
break;
}
if (timeptr) {
struct timespec tv;
u32 midtime;
getnstimeofday(&tv);
midtime = (tv.tv_sec % 86400) * MSEC_PER_SEC + tv.tv_nsec / NSEC_PER_MSEC;
put_unaligned_be32(midtime, timeptr);
__be32 midtime;
midtime = inet_current_timestamp();
memcpy(timeptr, &midtime, 4);
opt->is_changed = 1;
}
} else if ((optptr[3]&0xF) != IPOPT_TS_PRESPEC) {