diff options
Diffstat (limited to 'tcp.c')
| -rw-r--r-- | tcp.c | 21 |
1 files changed, 15 insertions, 6 deletions
@@ -327,7 +327,7 @@ #define MAX_WS 10 #define MAX_WINDOW (1 << (16 + (MAX_WS))) #define MSS_DEFAULT 536 -#define WINDOW_DEFAULT 4380 +#define WINDOW_DEFAULT 14600 /* RFC 6928 */ #define SYN_TIMEOUT 240000 /* ms */ #define ACK_TIMEOUT 3000 @@ -401,6 +401,7 @@ struct tcp_conn; * @ws_allowed: Window scaling allowed * @ws: Window scaling factor * @tap_window: Last window size received from tap, scaled + * @no_snd_wnd: Kernel won't report window (without commit 8f7baad7f035) * @ts_sock: Last activity timestamp from socket for timeout purposes * @ts_tap: Last activity timestamp from tap for timeout purposes * @ts_ack_tap: Last ACK segment timestamp from tap for timeout purposes @@ -434,6 +435,7 @@ struct tcp_conn { int ws_allowed; int ws; int tap_window; + int no_snd_wnd; struct timespec ts_sock; struct timespec ts_tap; @@ -748,13 +750,18 @@ static int tcp_send_to_tap(struct ctx *c, int s, int flags, char *in, int len) data += OPT_MSS_LEN - 2; th->doff += OPT_MSS_LEN / 4; - if (tc[s].ws_allowed && (ws = info.tcpi_snd_wscale)) { + /* Check if kernel includes commit: + * 8f7baad7f035 ("tcp: Add snd_wnd to TCP_INFO") + */ + tc[s].no_snd_wnd = !info.tcpi_snd_wnd; + + if (tc[s].ws_allowed && (ws = info.tcpi_snd_wscale) && + !tc[s].no_snd_wnd) { *data++ = OPT_NOP; *data++ = OPT_WS; *data++ = OPT_WS_LEN; - *data = ws; - *data += OPT_WS_LEN - 2; + *data++ = ws; th->doff += (1 + OPT_WS_LEN) / 4; } @@ -798,10 +805,10 @@ static int tcp_send_to_tap(struct ctx *c, int s, int flags, char *in, int len) th->source = tc[s].sock_port; th->dest = tc[s].tap_port; - if (!err) { + if (!err && !tc[s].no_snd_wnd) { /* First value sent by receiver is not scaled */ th->window = htons(info.tcpi_snd_wnd >> - ((flags & SYN) ? 0 : info.tcpi_snd_wscale)); + (th->syn ? 0 : info.tcpi_snd_wscale)); } else { th->window = htons(WINDOW_DEFAULT); } @@ -1344,6 +1351,8 @@ int tcp_tap_handler(struct ctx *c, int af, void *addr, th->psh ? 0 : MSG_MORE)) break; + tcp_data_from_sock(c, s, now); + if (th->fin) { shutdown(s, SHUT_WR); if (tc[s].s == ESTABLISHED) |