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path: root/tcp.c
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Diffstat (limited to 'tcp.c')
-rw-r--r--tcp.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/tcp.c b/tcp.c
index 6b5d29b..813d2ed 100644
--- a/tcp.c
+++ b/tcp.c
@@ -359,6 +359,11 @@
sizeof(struct ipv6hdr) - sizeof(struct tcphdr))
#define WINDOW_DEFAULT 14600 /* RFC 6928 */
+#ifdef HAS_SND_WND
+# define KERNEL_REPORTS_SND_WND(c) (c->tcp.kernel_snd_wnd)
+#else
+# define KERNEL_REPORTS_SND_WND(c) (0 && (c))
+#endif
#define SYN_TIMEOUT 240000 /* ms */
#define ACK_TIMEOUT 2000
@@ -1563,7 +1568,7 @@ static int tcp_update_seqack_wnd(struct ctx *c, struct tcp_tap_conn *conn,
conn->seq_ack_to_tap = prev_ack_to_tap;
}
- if (!c->tcp.kernel_snd_wnd) {
+ if (!KERNEL_REPORTS_SND_WND(c)) {
tcp_get_sndbuf(conn);
conn->wnd_to_tap = MIN(conn->snd_buf, MAX_WINDOW);
goto out;
@@ -1675,8 +1680,10 @@ static int tcp_send_to_tap(struct ctx *c, struct tcp_tap_conn *conn, int flags,
data += OPT_MSS_LEN - 2;
th->doff += OPT_MSS_LEN / 4;
+#ifdef HAS_SND_WND
if (!c->tcp.kernel_snd_wnd && info.tcpi_snd_wnd)
c->tcp.kernel_snd_wnd = 1;
+#endif
conn->ws = MIN(MAX_WS, info.tcpi_snd_wscale);