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path: root/tcp.c
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Diffstat (limited to 'tcp.c')
-rw-r--r--tcp.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/tcp.c b/tcp.c
index 96d462f..839bf30 100644
--- a/tcp.c
+++ b/tcp.c
@@ -321,7 +321,9 @@
#include <stddef.h>
#include <string.h>
#include <sys/epoll.h>
+#ifdef HAS_GETRANDOM
#include <sys/random.h>
+#endif
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/uio.h>
@@ -760,6 +762,7 @@ static int tcp_rtt_dst_low(struct tcp_tap_conn *conn)
*/
static void tcp_rtt_dst_check(struct tcp_tap_conn *conn, struct tcp_info *tinfo)
{
+#ifdef HAS_MIN_RTT
int i, hole = -1;
if (!tinfo->tcpi_min_rtt ||
@@ -777,6 +780,10 @@ static void tcp_rtt_dst_check(struct tcp_tap_conn *conn, struct tcp_info *tinfo)
if (hole == LOW_RTT_TABLE_SIZE)
hole = 0;
memcpy(low_rtt_dst + hole, &in6addr_any, sizeof(conn->a.a6));
+#else
+ (void)conn;
+ (void)tinfo;
+#endif /* HAS_MIN_RTT */
}
/**
@@ -1552,6 +1559,13 @@ static int tcp_update_seqack_wnd(struct ctx *c, struct tcp_tap_conn *conn,
struct tcp_info tinfo_new;
int s = conn->sock;
+#ifndef HAS_BYTES_ACKED
+ (void)flags;
+
+ conn->seq_ack_to_tap = conn->seq_from_tap;
+ if (SEQ_LT(conn->seq_ack_to_tap, prev_ack_to_tap))
+ conn->seq_ack_to_tap = prev_ack_to_tap;
+#else
if (conn->state > ESTABLISHED || (flags & (DUP_ACK | FORCE_ACK)) ||
conn->local || tcp_rtt_dst_low(conn) ||
conn->snd_buf < SNDBUF_SMALL) {
@@ -1569,6 +1583,7 @@ static int tcp_update_seqack_wnd(struct ctx *c, struct tcp_tap_conn *conn,
if (SEQ_LT(conn->seq_ack_to_tap, prev_ack_to_tap))
conn->seq_ack_to_tap = prev_ack_to_tap;
}
+#endif /* !HAS_BYTES_ACKED */
if (!KERNEL_REPORTS_SND_WND(c)) {
tcp_get_sndbuf(conn);
@@ -3586,9 +3601,30 @@ int tcp_sock_init(struct ctx *c, struct timespec *now)
{
struct tcp_sock_refill_arg refill_arg = { c, 0 };
int i, port;
+#ifndef HAS_GETRANDOM
+ int dev_random = open("/dev/random", O_RDONLY);
+ unsigned int random_read = 0;
+
+ while (dev_random && random_read < sizeof(c->tcp.hash_secret)) {
+ int ret = read(dev_random,
+ (uint8_t *)&c->tcp.hash_secret + random_read,
+ sizeof(c->tcp.hash_secret) - random_read);
+ if (ret == -1 && errno == EINTR)
+ continue;
+
+ if (ret <= 0)
+ break;
+
+ random_read += ret;
+ }
+ if (dev_random >= 0)
+ close(dev_random);
+ if (random_read < sizeof(c->tcp.hash_secret)) {
+#else
if (getrandom(&c->tcp.hash_secret, sizeof(c->tcp.hash_secret),
GRND_RANDOM) < 0) {
+#endif /* !HAS_GETRANDOM */
perror("TCP initial sequence getrandom");
exit(EXIT_FAILURE);
}