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 deepa.kernel@gmail.com Cc: "David S. Miller" davem@davemloft.net Cc: Alexey Kuznetsov kuznet@ms2.inr.ac.ru Cc: Hideaki YOSHIFUJI yoshfuji@linux-ipv6.org Cc: James Morris jmorris@namei.org Cc: Patrick McHardy kaber@trash.net --- include/net/ip.h | 2 ++ net/ipv4/af_inet.c | 26 ++++++++++++++++++++++++++ net/ipv4/icmp.c | 5 +---- net/ipv4/ip_options.c | 14 ++++++-------- 4 files changed, 35 insertions(+), 12 deletions(-)

diff --git a/include/net/ip.h b/include/net/ip.h index 1a98f1c..5d3a9eb 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -240,6 +240,8 @@ static inline int inet_is_local_reserved_port(struct net *net, int port) } #endif

+__be32 inet_current_timestamp(void); + /* From inetpeer.c */ extern int inet_peer_threshold; extern int inet_peer_minttl; diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index eade66d..408e2b3 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1386,6 +1386,32 @@ 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) diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index 36e2697..6333489 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -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(); diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c index bd24679..4d158ff 100644 --- a/net/ipv4/ip_options.c +++ b/net/ipv4/ip_options.c @@ -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) {

SCTP probe log timestamps use struct timespec which is not y2038 safe. Use struct timespec64 which is 2038 safe instead.

Use monotonic time instead of real time as only time differences are logged.

Signed-off-by: Deepa Dinamani deepa.kernel@gmail.com Reviewed-by: Arnd Bergmann arnd@arndb.de Acked-by: Neil Horman nhorman@tuxdriver.com Cc: Vlad Yasevich vyasevich@gmail.com Cc: Neil Horman nhorman@tuxdriver.com Cc: "David S. Miller" davem@davemloft.net Cc: linux-sctp@vger.kernel.org --- net/sctp/probe.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/sctp/probe.c b/net/sctp/probe.c index 5e68b94..6cc2152 100644 --- a/net/sctp/probe.c +++ b/net/sctp/probe.c @@ -65,7 +65,7 @@ static struct { struct kfifo fifo; spinlock_t lock; wait_queue_head_t wait; - struct timespec tstart; + struct timespec64 tstart; } sctpw;

static __printf(1, 2) void printl(const char *fmt, ...) @@ -85,7 +85,7 @@ static __printf(1, 2) void printl(const char *fmt, ...) static int sctpprobe_open(struct inode *inode, struct file *file) { kfifo_reset(&sctpw.fifo); - getnstimeofday(&sctpw.tstart); + ktime_get_ts64(&sctpw.tstart);

return 0; } @@ -138,7 +138,7 @@ static sctp_disposition_t jsctp_sf_eat_sack(struct net *net, struct sk_buff *skb = chunk->skb; struct sctp_transport *sp; static __u32 lcwnd = 0; - struct timespec now; + struct timespec64 now;

sp = asoc->peer.primary_path;

@@ -149,8 +149,8 @@ static sctp_disposition_t jsctp_sf_eat_sack(struct net *net, (full || sp->cwnd != lcwnd)) { lcwnd = sp->cwnd;

- getnstimeofday(&now); - now = timespec_sub(now, sctpw.tstart); + ktime_get_ts64(&now); + now = timespec64_sub(now, sctpw.tstart);

printl("%lu.%06lu ", (unsigned long) now.tv_sec, (unsigned long) now.tv_nsec / NSEC_PER_USEC);

Deepa Dinamani wrote:

TCP probe log timestamps use struct timespec which is not y2038 safe. Even though timespec might be good enough here as it is used to represent delta time, the plan is to get rid of all uses of timespec in the kernel. Replace with struct timespec64 which is y2038 safe.

Prints still use unsigned long format and type.

Signed-off-by: Deepa Dinamani deepa.kernel@gmail.com

Acked-by: YOSHIFUJI Hideaki yoshfuji@linux-ipv6.org

Reviewed-by: Arnd Bergmann arnd@arndb.de Cc: "David S. Miller" davem@davemloft.net Cc: Alexey Kuznetsov kuznet@ms2.inr.ac.ru Cc: James Morris jmorris@namei.org Cc: Hideaki YOSHIFUJI yoshfuji@linux-ipv6.org Cc: Patrick McHardy kaber@trash.net

---

net/ipv4/tcp_probe.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/tcp_probe.c b/net/ipv4/tcp_probe.c index ebf5ff5..f6c50af 100644 --- a/net/ipv4/tcp_probe.c +++ b/net/ipv4/tcp_probe.c @@ -187,13 +187,13 @@ static int tcpprobe_sprint(char *tbuf, int n) { const struct tcp_log *p = tcp_probe.log + tcp_probe.tail;

• struct timespec tv

• = ktime_to_timespec(ktime_sub(p->tstamp, tcp_probe.start));
  

• struct timespec64 ts

• = ktime_to_timespec64(ktime_sub(p->tstamp, tcp_probe.start));
  

return scnprintf(tbuf, n, "%lu.%09lu %pISpc %pISpc %d %#x %#x %u %u %u %u %u\n",

• 	(unsigned long)tv.tv_sec,
  

• 	(unsigned long)tv.tv_nsec,
  

• 	(unsigned long)ts.tv_sec,
  

• 	(unsigned long)ts.tv_nsec,
  &p->src, &p->dst, p->length, p->snd_nxt, p->snd_una,
  p->snd_cwnd, p->ssthresh, p->snd_wnd, p->srtt, p->rcv_wnd);
  

}