mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
tcp: ensure proper barriers in lockless contexts
Some functions access TCP sockets without holding a lock and might output non consistent data, depending on compiler and or architecture. tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ... Introduce sk_state_load() and sk_state_store() to fix the issues, and more clearly document where this lack of locking is happening. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
5883d9c6d7
commit
00fd38d938
6 changed files with 62 additions and 23 deletions
|
@ -2226,6 +2226,31 @@ static inline bool sk_listener(const struct sock *sk)
|
|||
return (1 << sk->sk_state) & (TCPF_LISTEN | TCPF_NEW_SYN_RECV);
|
||||
}
|
||||
|
||||
/**
|
||||
* sk_state_load - read sk->sk_state for lockless contexts
|
||||
* @sk: socket pointer
|
||||
*
|
||||
* Paired with sk_state_store(). Used in places we do not hold socket lock :
|
||||
* tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ...
|
||||
*/
|
||||
static inline int sk_state_load(const struct sock *sk)
|
||||
{
|
||||
return smp_load_acquire(&sk->sk_state);
|
||||
}
|
||||
|
||||
/**
|
||||
* sk_state_store - update sk->sk_state
|
||||
* @sk: socket pointer
|
||||
* @newstate: new state
|
||||
*
|
||||
* Paired with sk_state_load(). Should be used in contexts where
|
||||
* state change might impact lockless readers.
|
||||
*/
|
||||
static inline void sk_state_store(struct sock *sk, int newstate)
|
||||
{
|
||||
smp_store_release(&sk->sk_state, newstate);
|
||||
}
|
||||
|
||||
void sock_enable_timestamp(struct sock *sk, int flag);
|
||||
int sock_get_timestamp(struct sock *, struct timeval __user *);
|
||||
int sock_get_timestampns(struct sock *, struct timespec __user *);
|
||||
|
|
|
@ -563,7 +563,7 @@ static void reqsk_timer_handler(unsigned long data)
|
|||
int max_retries, thresh;
|
||||
u8 defer_accept;
|
||||
|
||||
if (sk_listener->sk_state != TCP_LISTEN)
|
||||
if (sk_state_load(sk_listener) != TCP_LISTEN)
|
||||
goto drop;
|
||||
|
||||
max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries;
|
||||
|
@ -749,7 +749,7 @@ int inet_csk_listen_start(struct sock *sk, int backlog)
|
|||
* It is OK, because this socket enters to hash table only
|
||||
* after validation is complete.
|
||||
*/
|
||||
sk->sk_state = TCP_LISTEN;
|
||||
sk_state_store(sk, TCP_LISTEN);
|
||||
if (!sk->sk_prot->get_port(sk, inet->inet_num)) {
|
||||
inet->inet_sport = htons(inet->inet_num);
|
||||
|
||||
|
|
|
@ -451,11 +451,14 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
|
|||
unsigned int mask;
|
||||
struct sock *sk = sock->sk;
|
||||
const struct tcp_sock *tp = tcp_sk(sk);
|
||||
int state;
|
||||
|
||||
sock_rps_record_flow(sk);
|
||||
|
||||
sock_poll_wait(file, sk_sleep(sk), wait);
|
||||
if (sk->sk_state == TCP_LISTEN)
|
||||
|
||||
state = sk_state_load(sk);
|
||||
if (state == TCP_LISTEN)
|
||||
return inet_csk_listen_poll(sk);
|
||||
|
||||
/* Socket is not locked. We are protected from async events
|
||||
|
@ -492,14 +495,14 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
|
|||
* NOTE. Check for TCP_CLOSE is added. The goal is to prevent
|
||||
* blocking on fresh not-connected or disconnected socket. --ANK
|
||||
*/
|
||||
if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == TCP_CLOSE)
|
||||
if (sk->sk_shutdown == SHUTDOWN_MASK || state == TCP_CLOSE)
|
||||
mask |= POLLHUP;
|
||||
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
||||
mask |= POLLIN | POLLRDNORM | POLLRDHUP;
|
||||
|
||||
/* Connected or passive Fast Open socket? */
|
||||
if (sk->sk_state != TCP_SYN_SENT &&
|
||||
(sk->sk_state != TCP_SYN_RECV || tp->fastopen_rsk)) {
|
||||
if (state != TCP_SYN_SENT &&
|
||||
(state != TCP_SYN_RECV || tp->fastopen_rsk)) {
|
||||
int target = sock_rcvlowat(sk, 0, INT_MAX);
|
||||
|
||||
if (tp->urg_seq == tp->copied_seq &&
|
||||
|
@ -507,9 +510,6 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
|
|||
tp->urg_data)
|
||||
target++;
|
||||
|
||||
/* Potential race condition. If read of tp below will
|
||||
* escape above sk->sk_state, we can be illegally awaken
|
||||
* in SYN_* states. */
|
||||
if (tp->rcv_nxt - tp->copied_seq >= target)
|
||||
mask |= POLLIN | POLLRDNORM;
|
||||
|
||||
|
@ -1934,7 +1934,7 @@ void tcp_set_state(struct sock *sk, int state)
|
|||
/* Change state AFTER socket is unhashed to avoid closed
|
||||
* socket sitting in hash tables.
|
||||
*/
|
||||
sk->sk_state = state;
|
||||
sk_state_store(sk, state);
|
||||
|
||||
#ifdef STATE_TRACE
|
||||
SOCK_DEBUG(sk, "TCP sk=%p, State %s -> %s\n", sk, statename[oldstate], statename[state]);
|
||||
|
@ -2644,7 +2644,8 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
|
|||
if (sk->sk_type != SOCK_STREAM)
|
||||
return;
|
||||
|
||||
info->tcpi_state = sk->sk_state;
|
||||
info->tcpi_state = sk_state_load(sk);
|
||||
|
||||
info->tcpi_ca_state = icsk->icsk_ca_state;
|
||||
info->tcpi_retransmits = icsk->icsk_retransmits;
|
||||
info->tcpi_probes = icsk->icsk_probes_out;
|
||||
|
@ -2672,7 +2673,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
|
|||
info->tcpi_snd_mss = tp->mss_cache;
|
||||
info->tcpi_rcv_mss = icsk->icsk_ack.rcv_mss;
|
||||
|
||||
if (sk->sk_state == TCP_LISTEN) {
|
||||
if (info->tcpi_state == TCP_LISTEN) {
|
||||
info->tcpi_unacked = sk->sk_ack_backlog;
|
||||
info->tcpi_sacked = sk->sk_max_ack_backlog;
|
||||
} else {
|
||||
|
|
|
@ -21,7 +21,7 @@ static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
|
|||
{
|
||||
struct tcp_info *info = _info;
|
||||
|
||||
if (sk->sk_state == TCP_LISTEN) {
|
||||
if (sk_state_load(sk) == TCP_LISTEN) {
|
||||
r->idiag_rqueue = sk->sk_ack_backlog;
|
||||
r->idiag_wqueue = sk->sk_max_ack_backlog;
|
||||
} else if (sk->sk_type == SOCK_STREAM) {
|
||||
|
|
|
@ -2158,6 +2158,7 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i)
|
|||
__u16 destp = ntohs(inet->inet_dport);
|
||||
__u16 srcp = ntohs(inet->inet_sport);
|
||||
int rx_queue;
|
||||
int state;
|
||||
|
||||
if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
|
||||
icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
|
||||
|
@ -2175,17 +2176,18 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i)
|
|||
timer_expires = jiffies;
|
||||
}
|
||||
|
||||
if (sk->sk_state == TCP_LISTEN)
|
||||
state = sk_state_load(sk);
|
||||
if (state == TCP_LISTEN)
|
||||
rx_queue = sk->sk_ack_backlog;
|
||||
else
|
||||
/*
|
||||
* because we dont lock socket, we might find a transient negative value
|
||||
/* Because we don't lock the socket,
|
||||
* we might find a transient negative value.
|
||||
*/
|
||||
rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
|
||||
|
||||
seq_printf(f, "%4d: %08X:%04X %08X:%04X %02X %08X:%08X %02X:%08lX "
|
||||
"%08X %5u %8d %lu %d %pK %lu %lu %u %u %d",
|
||||
i, src, srcp, dest, destp, sk->sk_state,
|
||||
i, src, srcp, dest, destp, state,
|
||||
tp->write_seq - tp->snd_una,
|
||||
rx_queue,
|
||||
timer_active,
|
||||
|
@ -2199,8 +2201,8 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i)
|
|||
jiffies_to_clock_t(icsk->icsk_ack.ato),
|
||||
(icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong,
|
||||
tp->snd_cwnd,
|
||||
sk->sk_state == TCP_LISTEN ?
|
||||
(fastopenq ? fastopenq->max_qlen : 0) :
|
||||
state == TCP_LISTEN ?
|
||||
fastopenq->max_qlen :
|
||||
(tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh));
|
||||
}
|
||||
|
||||
|
|
|
@ -1690,6 +1690,8 @@ static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
|
|||
const struct tcp_sock *tp = tcp_sk(sp);
|
||||
const struct inet_connection_sock *icsk = inet_csk(sp);
|
||||
const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq;
|
||||
int rx_queue;
|
||||
int state;
|
||||
|
||||
dest = &sp->sk_v6_daddr;
|
||||
src = &sp->sk_v6_rcv_saddr;
|
||||
|
@ -1710,6 +1712,15 @@ static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
|
|||
timer_expires = jiffies;
|
||||
}
|
||||
|
||||
state = sk_state_load(sp);
|
||||
if (state == TCP_LISTEN)
|
||||
rx_queue = sp->sk_ack_backlog;
|
||||
else
|
||||
/* Because we don't lock the socket,
|
||||
* we might find a transient negative value.
|
||||
*/
|
||||
rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
|
||||
|
||||
seq_printf(seq,
|
||||
"%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
|
||||
"%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n",
|
||||
|
@ -1718,9 +1729,9 @@ static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
|
|||
src->s6_addr32[2], src->s6_addr32[3], srcp,
|
||||
dest->s6_addr32[0], dest->s6_addr32[1],
|
||||
dest->s6_addr32[2], dest->s6_addr32[3], destp,
|
||||
sp->sk_state,
|
||||
tp->write_seq-tp->snd_una,
|
||||
(sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
|
||||
state,
|
||||
tp->write_seq - tp->snd_una,
|
||||
rx_queue,
|
||||
timer_active,
|
||||
jiffies_delta_to_clock_t(timer_expires - jiffies),
|
||||
icsk->icsk_retransmits,
|
||||
|
@ -1732,7 +1743,7 @@ static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
|
|||
jiffies_to_clock_t(icsk->icsk_ack.ato),
|
||||
(icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong,
|
||||
tp->snd_cwnd,
|
||||
sp->sk_state == TCP_LISTEN ?
|
||||
state == TCP_LISTEN ?
|
||||
fastopenq->max_qlen :
|
||||
(tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)
|
||||
);
|
||||
|
|
Loading…
Reference in a new issue