diff options
Diffstat (limited to 'crypto/openssh/channels.c')
| -rw-r--r-- | crypto/openssh/channels.c | 98 |
1 files changed, 87 insertions, 11 deletions
diff --git a/crypto/openssh/channels.c b/crypto/openssh/channels.c index 6abe2d0..bf7072a 100644 --- a/crypto/openssh/channels.c +++ b/crypto/openssh/channels.c @@ -1,4 +1,5 @@ /* $OpenBSD: channels.c,v 1.310 2010/11/24 01:24:14 djm Exp $ */ +/* $FreeBSD$ */ /* * Author: Tatu Ylonen <ylo@cs.hut.fi> * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland @@ -170,6 +171,11 @@ static void port_open_helper(Channel *c, char *rtype); static int connect_next(struct channel_connect *); static void channel_connect_ctx_free(struct channel_connect *); +/* -- HPN */ + +static int hpn_disabled = 0; +static u_int buffer_size = CHAN_HPN_MIN_WINDOW_DEFAULT; + /* -- channel core */ Channel * @@ -309,6 +315,7 @@ channel_new(char *ctype, int type, int rfd, int wfd, int efd, c->self = found; c->type = type; c->ctype = ctype; + c->dynamic_window = 0; c->local_window = window; c->local_window_max = window; c->local_consumed = 0; @@ -808,11 +815,46 @@ channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) FD_SET(c->sock, writeset); } +static u_int +channel_tcpwinsz(void) +{ + u_int32_t tcpwinsz; + socklen_t optsz; + int ret, sd; + u_int maxlen; + + /* If we are not on a socket return 128KB. */ + if (!packet_connection_is_on_socket()) + return (128 * 1024); + + tcpwinsz = 0; + optsz = sizeof(tcpwinsz); + sd = packet_get_connection_in(); + ret = getsockopt(sd, SOL_SOCKET, SO_RCVBUF, &tcpwinsz, &optsz); + + /* Return no more than the maximum buffer size. */ + maxlen = buffer_get_max_len(); + if ((ret == 0) && tcpwinsz > maxlen) + tcpwinsz = maxlen; + /* In case getsockopt() failed return a minimum. */ + if (tcpwinsz == 0) + tcpwinsz = CHAN_TCP_WINDOW_DEFAULT; + debug2("tcpwinsz: %d for connection: %d", tcpwinsz, sd); + return (tcpwinsz); +} + static void channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) { - u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); + u_int limit; + + /* Check buffer limits. */ + if (!c->tcpwinsz || c->dynamic_window > 0) + c->tcpwinsz = channel_tcpwinsz(); + limit = MIN(compat20 ? c->remote_window : packet_get_maxsize(), + 2 * c->tcpwinsz); + if (c->istate == CHAN_INPUT_OPEN && limit > 0 && buffer_len(&c->input) < limit && @@ -1789,14 +1831,25 @@ channel_check_window(Channel *c) c->local_maxpacket*3) || c->local_window < c->local_window_max/2) && c->local_consumed > 0) { + u_int addition = 0; + + /* Adjust max window size if we are in a dynamic environment. */ + if (c->dynamic_window && c->tcpwinsz > c->local_window_max) { + /* + * Grow the window somewhat aggressively to maintain + * pressure. + */ + addition = 1.5 * (c->tcpwinsz - c->local_window_max); + c->local_window_max += addition; + } packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); packet_put_int(c->remote_id); - packet_put_int(c->local_consumed); + packet_put_int(c->local_consumed + addition); packet_send(); debug2("channel %d: window %d sent adjust %d", c->self, c->local_window, c->local_consumed); - c->local_window += c->local_consumed; + c->local_window += c->local_consumed + addition; c->local_consumed = 0; } return 1; @@ -2634,6 +2687,15 @@ channel_set_af(int af) IPv4or6 = af; } +void +channel_set_hpn(int disabled, u_int buf_size) +{ + hpn_disabled = disabled; + buffer_size = buf_size; + debug("HPN Disabled: %d, HPN Buffer Size: %d", + hpn_disabled, buffer_size); +} + static int channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, int *allocated_listen_port, @@ -2786,10 +2848,18 @@ channel_setup_fwd_listener(int type, const char *listen_addr, *allocated_listen_port); } - /* Allocate a channel number for the socket. */ - c = channel_new("port listener", type, sock, sock, -1, - CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, - 0, "port listener", 1); + /* + * Allocate a channel number for the socket. Explicitly test + * for hpn disabled option. If true use smaller window size. + */ + if (hpn_disabled) + c = channel_new("port listener", type, sock, sock, -1, + CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, + 0, "port listener", 1); + else + c = channel_new("port listener", type, sock, sock, -1, + buffer_size, CHAN_TCP_PACKET_DEFAULT, + 0, "port listener", 1); c->path = xstrdup(host); c->host_port = port_to_connect; c->listening_port = listen_port; @@ -3334,10 +3404,16 @@ x11_create_display_inet(int x11_display_offset, int x11_use_localhost, *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); for (n = 0; n < num_socks; n++) { sock = socks[n]; - nc = channel_new("x11 listener", - SSH_CHANNEL_X11_LISTENER, sock, sock, -1, - CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, - 0, "X11 inet listener", 1); + if (hpn_disabled) + nc = channel_new("x11 listener", + SSH_CHANNEL_X11_LISTENER, sock, sock, -1, + CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, + 0, "X11 inet listener", 1); + else + nc = channel_new("x11 listener", + SSH_CHANNEL_X11_LISTENER, sock, sock, -1, + buffer_size, CHAN_X11_PACKET_DEFAULT, + 0, "X11 inet listener", 1); nc->single_connection = single_connection; (*chanids)[n] = nc->self; } |
