From 822c868532cae2cc1c51f4f18ab61c194d98aaf6 Mon Sep 17 00:00:00 2001 From: Deepa Dinamani Date: Sat, 27 Feb 2016 00:32:15 -0800 Subject: [PATCH 1/3] net: ipv4: Convert IP network timestamps to be y2038 safe 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 Cc: "David S. Miller" Cc: Alexey Kuznetsov Cc: Hideaki YOSHIFUJI Cc: James Morris Cc: Patrick McHardy Acked-by: YOSHIFUJI Hideaki Acked-by: Arnd Bergmann Signed-off-by: David S. Miller --- 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 cbb134b2f0e4f..fad74d323bd6b 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 209d1ed289544..0cc923f83e107 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1380,6 +1380,32 @@ static struct sk_buff **inet_gro_receive(struct sk_buff **head, 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 36e26977c9088..6333489771ed0 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 bd246792360b4..4d158ff1def1a 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) { From b1b270d863c022f3dbf1f8786fd2956703ee10fc Mon Sep 17 00:00:00 2001 From: Deepa Dinamani Date: Sat, 27 Feb 2016 00:32:16 -0800 Subject: [PATCH 2/3] net: ipv4: tcp_probe: Replace timespec with timespec64 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 Reviewed-by: Arnd Bergmann Cc: "David S. Miller" Cc: Alexey Kuznetsov Cc: James Morris Cc: Hideaki YOSHIFUJI Cc: Patrick McHardy Acked-by: YOSHIFUJI Hideaki Signed-off-by: David S. Miller --- 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 ebf5ff57526ea..f6c50af24a647 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); } From 6497c7e6400105424a7d1dddc3f3aadcc8e3588a Mon Sep 17 00:00:00 2001 From: Deepa Dinamani Date: Sat, 27 Feb 2016 00:32:17 -0800 Subject: [PATCH 3/3] net: sctp: Convert log timestamps to be y2038 safe 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 Reviewed-by: Arnd Bergmann Acked-by: Neil Horman Cc: Vlad Yasevich Cc: Neil Horman Cc: "David S. Miller" Cc: linux-sctp@vger.kernel.org Signed-off-by: David S. Miller --- 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 5e68b94ee6401..6cc2152e07404 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);