system/openssh: add drastically simplified OpenSSH

1 files changed, 835 insertions, 0 deletions

diff --git a/system/openssh/openssh7.4-dynwindows.patch b/system/openssh/openssh7.4-dynwindows.patch
new file mode 100644
index 000000000..45c42159e
--- /dev/null
+++ b/system/openssh/openssh7.4-dynwindows.patch
@@ -0,0 +1,835 @@
+--- a/buffer.h
++++ b/buffer.h
+@@ -16,6 +16,9 @@
+  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+  */
+ 
++/* move the following to a more appropriate place and name */
++#define BUFFER_MAX_LEN_HPN          0x4000000  /* 64MB */
++
+ /* Emulation wrappers for legacy OpenSSH buffer API atop sshbuf */
+ 
+ #ifndef BUFFER_H
+--- a/channels.c
++++ b/channels.c
+@@ -191,8 +191,14 @@
+ static int connect_next(struct channel_connect *);
+ static void channel_connect_ctx_free(struct channel_connect *);
+ 
++
++static int hpn_disabled = 0;
++static int hpn_buffer_size = 2 * 1024 * 1024;
++
+ /* -- channel core */
+ 
++
++
+ Channel *
+ channel_by_id(int id)
+ {
+@@ -356,6 +362,7 @@
+ 	c->local_window_max = window;
+ 	c->local_consumed = 0;
+ 	c->local_maxpacket = maxpack;
++	c->dynamic_window = 0;
+ 	c->remote_id = -1;
+ 	c->remote_name = xstrdup(remote_name);
+ 	c->remote_window = 0;
+@@ -904,11 +911,35 @@
+ 		FD_SET(c->sock, writeset);
+ }
+ 
++int channel_tcpwinsz () {
++        u_int32_t tcpwinsz = 0;
++        socklen_t optsz = sizeof(tcpwinsz);
++	int ret = -1;
++
++	/* if we aren't on a socket return 128KB*/
++	if(!packet_connection_is_on_socket())
++	    return(128*1024);
++	ret = getsockopt(packet_get_connection_in(),
++			 SOL_SOCKET, SO_RCVBUF, &tcpwinsz, &optsz);
++	/* return no more than 64MB */
++	if ((ret == 0) && tcpwinsz > BUFFER_MAX_LEN_HPN)
++	    tcpwinsz = BUFFER_MAX_LEN_HPN;
++	debug2("tcpwinsz: %d for connection: %d", tcpwinsz,
++	       packet_get_connection_in());
++	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();
+ 
++	/* check buffer limits */
++	if ((!c->tcpwinsz) || (c->dynamic_window > 0))
++		c->tcpwinsz = channel_tcpwinsz();
++
++	limit = MIN(limit, 2 * c->tcpwinsz);
++
+ 	if (c->istate == CHAN_INPUT_OPEN &&
+ 	    limit > 0 &&
+ 	    buffer_len(&c->input) < limit &&
+@@ -1926,14 +1957,21 @@
+ 	    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;
+@@ -3179,6 +3217,15 @@
+ 	return addr;
+ }
+ 
++
++void
++channel_set_hpn(int external_hpn_disabled, int external_hpn_buffer_size)
++{
++	hpn_disabled = external_hpn_disabled;
++	hpn_buffer_size = external_hpn_buffer_size;
++	debug("HPN Disabled: %d, HPN Buffer Size: %d", hpn_disabled, hpn_buffer_size);
++}
++
+ static int
+ channel_setup_fwd_listener_tcpip(int type, struct Forward *fwd,
+     int *allocated_listen_port, struct ForwardOptions *fwd_opts)
+@@ -3307,9 +3354,15 @@
+ 		}
+ 
+ 		/* 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,
++ 			  hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
++ 			  0, "port listener", 1);
+ 		c->path = xstrdup(host);
+ 		c->host_port = fwd->connect_port;
+ 		c->listening_addr = addr == NULL ? NULL : xstrdup(addr);
+@@ -4313,10 +4366,17 @@
+ 	*chanids = xcalloc(num_socks + 1, sizeof(**chanids));
+ 	for (n = 0; n < num_socks; n++) {
+ 		sock = socks[n];
++		/* Is this really necassary? */
++		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,
++			    hpn_buffer_size, CHAN_X11_PACKET_DEFAULT,
++			    0, "X11 inet listener", 1);
+ 		nc->single_connection = single_connection;
+ 		(*chanids)[n] = nc->self;
+ 	}
+--- a/channels.h
++++ b/channels.h
+@@ -135,8 +135,10 @@
+ 	u_int	local_window_max;
+ 	u_int	local_consumed;
+ 	u_int	local_maxpacket;
++	int	dynamic_window;
+ 	int     extended_usage;
+ 	int	single_connection;
++	u_int	tcpwinsz;
+ 
+ 	char   *ctype;		/* type */
+ 
+@@ -173,8 +175,10 @@
+ /* default window/packet sizes for tcp/x11-fwd-channel */
+ #define CHAN_SES_PACKET_DEFAULT	(32*1024)
+ #define CHAN_SES_WINDOW_DEFAULT	(64*CHAN_SES_PACKET_DEFAULT)
++
+ #define CHAN_TCP_PACKET_DEFAULT	(32*1024)
+ #define CHAN_TCP_WINDOW_DEFAULT	(64*CHAN_TCP_PACKET_DEFAULT)
++
+ #define CHAN_X11_PACKET_DEFAULT	(16*1024)
+ #define CHAN_X11_WINDOW_DEFAULT	(4*CHAN_X11_PACKET_DEFAULT)
+ 
+@@ -318,5 +322,8 @@
+ void	 chan_rcvd_ieof(Channel *);
+ void	 chan_write_failed(Channel *);
+ void	 chan_obuf_empty(Channel *);
++
++/* hpn handler */
++void     channel_set_hpn(int, int);
+ 
+ #endif
+--- a/clientloop.c
++++ b/clientloop.c
+@@ -1990,9 +1990,15 @@
+ 	sock = x11_connect_display();
+ 	if (sock < 0)
+ 		return NULL;
++	/* again is this really necessary for X11? */
++	if (options.hpn_disabled)
+ 	c = channel_new("x11",
+ 	    SSH_CHANNEL_X11_OPEN, sock, sock, -1,
+ 	    CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
++	else
++		c = channel_new("x11",
++		    SSH_CHANNEL_X11_OPEN, sock, sock, -1,
++		    options.hpn_buffer_size, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
+ 	c->force_drain = 1;
+ 	return c;
+ }
+@@ -2015,10 +2021,16 @@
+ 			    __func__, ssh_err(r));
+ 		return NULL;
+ 	}
++	if (options.hpn_disabled)
+ 	c = channel_new("authentication agent connection",
+ 	    SSH_CHANNEL_OPEN, sock, sock, -1,
+-	    CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
++	    CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
+ 	    "authentication agent connection", 1);
++	else
++	c = channel_new("authentication agent connection",
++	    SSH_CHANNEL_OPEN, sock, sock, -1,
++	    options.hpn_buffer_size, options.hpn_buffer_size, 0,
++ 	    "authentication agent connection", 1);
+ 	c->force_drain = 1;
+ 	return c;
+ }
+@@ -2045,9 +2057,17 @@
+ 		return -1;
+ 	}
+ 
++	if(options.hpn_disabled)
+ 	c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
+-	    CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
++				CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
++				0, "tun", 1);
++	else
++	c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
++				options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT,
++				0, "tun", 1);
+ 	c->datagram = 1;
++
++
+ 
+ #if defined(SSH_TUN_FILTER)
+ 	if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
+--- a/compat.c
++++ b/compat.c
+@@ -40,7 +40,7 @@
+ 
+ int compat13 = 0;
+ int compat20 = 0;
+-int datafellows = 0;
++unsigned int datafellows = 0;
+ 
+ void
+ enable_compat20(void)
+@@ -63,7 +63,7 @@ compat_datafellows(const char *version)
+ 	int i;
+ 	static struct {
+ 		char	*pat;
+-		int	bugs;
++		unsigned int	bugs;
+ 	} check[] = {
+ 		{ "OpenSSH-2.0*,"
+ 		  "OpenSSH-2.1*,"
+@@ -210,6 +210,12 @@ compat_datafellows(const char *version)
+ 			debug("match: %s pat %s compat 0x%08x",
+ 			    version, check[i].pat, check[i].bugs);
+ 			datafellows = check[i].bugs;	/* XXX for now */
++			/* Check to see if the remote side is OpenSSH and not HPN */
++			if (strstr(version,"OpenSSH") != NULL &&
++			    strstr(version,"hpn") == NULL) {
++				datafellows |= SSH_BUG_LARGEWINDOW;
++				debug("Remote is NON-HPN aware");
++			}
+ 			return check[i].bugs;
+ 		}
+ 	}
+diff --git a/compat.h b/compat.h
+index 2be290a..453c85e 100644
+--- a/compat.h
++++ b/compat.h
+@@ -62,6 +62,7 @@
+ #define SSH_BUG_CURVE25519PAD	0x10000000
+ #define SSH_BUG_HOSTKEYS	0x20000000
+ #define SSH_BUG_DHGEX_LARGE	0x40000000
++#define SSH_BUG_LARGEWINDOW     0x80000000
+ 
+ void     enable_compat13(void);
+ void     enable_compat20(void);
+@@ -73,5 +74,5 @@ char	*compat_kex_proposal(char *);
+ 
+ extern int compat13;
+ extern int compat20;
+-extern int datafellows;
++extern unsigned int datafellows;
+ #endif
+--- a/readconf.c
++++ b/readconf.c
+@@ -154,6 +154,7 @@
+ 	oCompressionLevel, oTCPKeepAlive, oNumberOfPasswordPrompts,
+ 	oUsePrivilegedPort, oLogLevel, oCiphers, oProtocol, oMacs,
+ 	oPubkeyAuthentication,
++	oTcpRcvBufPoll, oTcpRcvBuf, oHPNDisabled, oHPNBufferSize,
+ 	oKbdInteractiveAuthentication, oKbdInteractiveDevices, oHostKeyAlias,
+ 	oDynamicForward, oPreferredAuthentications, oHostbasedAuthentication,
+ 	oHostKeyAlgorithms, oBindAddress, oPKCS11Provider,
+@@ -297,6 +298,11 @@
+ 	{ "ignoreunknown", oIgnoreUnknown },
+ 	{ "proxyjump", oProxyJump },
+ 
++	{ "tcprcvbufpoll", oTcpRcvBufPoll },
++	{ "tcprcvbuf", oTcpRcvBuf },
++	{ "hpndisabled", oHPNDisabled },
++	{ "hpnbuffersize", oHPNBufferSize },
++
+ 	{ NULL, oBadOption }
+ };
+ 
+@@ -973,6 +979,18 @@
+ 		intptr = &options->check_host_ip;
+ 		goto parse_flag;
+ 
++	case oHPNDisabled:
++		intptr = &options->hpn_disabled;
++		goto parse_flag;
++
++	case oHPNBufferSize:
++		intptr = &options->hpn_buffer_size;
++		goto parse_int;
++
++	case oTcpRcvBufPoll:
++		intptr = &options->tcp_rcv_buf_poll;
++		goto parse_flag;
++
+ 	case oVerifyHostKeyDNS:
+ 		intptr = &options->verify_host_key_dns;
+ 		multistate_ptr = multistate_yesnoask;
+@@ -1165,6 +1183,10 @@
+ 		intptr = &options->connection_attempts;
+ 		goto parse_int;
+ 
++	case oTcpRcvBuf:
++		intptr = &options->tcp_rcv_buf;
++		goto parse_int;
++
+ 	case oCipher:
+ 		intptr = &options->cipher;
+ 		arg = strdelim(&s);
+@@ -1845,6 +1867,10 @@
+ 	options->ip_qos_interactive = -1;
+ 	options->ip_qos_bulk = -1;
+ 	options->request_tty = -1;
++	options->hpn_disabled = -1;
++	options->hpn_buffer_size = -1;
++	options->tcp_rcv_buf_poll = -1;
++	options->tcp_rcv_buf = -1;
+ 	options->proxy_use_fdpass = -1;
+ 	options->ignored_unknown = NULL;
+ 	options->num_canonical_domains = 0;
+@@ -2008,6 +2034,28 @@
+ 		options->server_alive_interval = 0;
+ 	if (options->server_alive_count_max == -1)
+ 		options->server_alive_count_max = 3;
++	if (options->hpn_disabled == -1)
++	        options->hpn_disabled = 0;
++	if (options->hpn_buffer_size > -1)
++	{
++	  /* if a user tries to set the size to 0 set it to 1KB */
++		if (options->hpn_buffer_size == 0)
++		options->hpn_buffer_size = 1;
++		/*limit the buffer to 64MB*/
++		if (options->hpn_buffer_size > 64*1024)
++		{
++			options->hpn_buffer_size = 64*1024*1024;
++			debug("User requested buffer larger than 64MB. Request reverted to 64MB");
++		}
++		else options->hpn_buffer_size *= 1024;
++		debug("hpn_buffer_size set to %d", options->hpn_buffer_size);
++	}
++	if (options->tcp_rcv_buf == 0)
++		options->tcp_rcv_buf = 1;
++	if (options->tcp_rcv_buf > -1)
++		options->tcp_rcv_buf *=1024;
++	if (options->tcp_rcv_buf_poll == -1)
++		options->tcp_rcv_buf_poll = 1;
+ 	if (options->control_master == -1)
+ 		options->control_master = 0;
+ 	if (options->control_persist == -1) {
+--- a/readconf.h
++++ b/readconf.h
+@@ -57,6 +57,10 @@ typedef struct {
+ 	int     compression_level;	/* Compression level 1 (fast) to 9
+ 					 * (best). */
+ 	int     tcp_keep_alive;	/* Set SO_KEEPALIVE. */
++	int     tcp_rcv_buf; /* user switch to set tcp recv buffer */
++	int     tcp_rcv_buf_poll; /* Option to poll recv buf every window transfer */
++	int     hpn_disabled;    /* Switch to disable HPN buffer management */
++	int     hpn_buffer_size; /* User definable size for HPN buffer window */
+ 	int	ip_qos_interactive;	/* IP ToS/DSCP/class for interactive */
+ 	int	ip_qos_bulk;		/* IP ToS/DSCP/class for bulk traffic */
+ 	LogLevel log_level;	/* Level for logging. */
+--- a/scp.c
++++ b/scp.c
+@@ -763,7 +763,7 @@
+ 	off_t i, statbytes;
+ 	size_t amt, nr;
+ 	int fd = -1, haderr, indx;
+-	char *last, *name, buf[2048], encname[PATH_MAX];
++	char *last, *name, buf[16384], encname[PATH_MAX];
+ 	int len;
+ 
+ 	for (indx = 0; indx < argc; ++indx) {
+@@ -931,7 +931,7 @@
+ 	off_t size, statbytes;
+ 	unsigned long long ull;
+ 	int setimes, targisdir, wrerrno = 0;
+-	char ch, *cp, *np, *targ, *why, *vect[1], buf[2048], visbuf[2048];
++	char ch, *cp, *np, *targ, *why, *vect[1], buf[16384], visbuf[16384];
+ 	struct timeval tv[2];
+ 
+ #define	atime	tv[0]
+--- a/servconf.c
++++ b/servconf.c
+@@ -159,6 +159,9 @@
+ 	options->authorized_principals_file = NULL;
+ 	options->authorized_principals_command = NULL;
+ 	options->authorized_principals_command_user = NULL;
++	options->tcp_rcv_buf_poll = -1;
++	options->hpn_disabled = -1;
++	options->hpn_buffer_size = -1;
+ 	options->ip_qos_interactive = -1;
+ 	options->ip_qos_bulk = -1;
+ 	options->version_addendum = NULL;
+@@ -190,6 +193,7 @@
+ void
+ fill_default_server_options(ServerOptions *options)
+ {
++	int sock, socksize, socksizelen = sizeof(int);
+ 	int i;
+ 
+ 	/* Portable-specific options */
+@@ -319,6 +323,41 @@
+ 	}
+ 	if (options->permit_tun == -1)
+ 		options->permit_tun = SSH_TUNMODE_NO;
++       if (options->hpn_disabled == -1)
++               options->hpn_disabled = 0;
++
++       if (options->hpn_buffer_size == -1) {
++		/* option not explicitly set. Now we have to figure out */
++		/* what value to use */
++		if (options->hpn_disabled == 1) {
++			options->hpn_buffer_size = CHAN_SES_WINDOW_DEFAULT;
++		} else {
++			/* get the current RCV size and set it to that */
++			/*create a socket but don't connect it */
++			/* we use that the get the rcv socket size */
++			sock = socket(AF_INET, SOCK_STREAM, 0);
++			getsockopt(sock, SOL_SOCKET, SO_RCVBUF,
++				   &socksize, &socksizelen);
++			close(sock);
++			options->hpn_buffer_size = socksize;
++			debug ("HPN Buffer Size: %d", options->hpn_buffer_size);
++		}
++	} else {
++		/* we have to do this incase the user sets both values in a contradictory */
++		/* manner. hpn_disabled overrrides hpn_buffer_size*/
++		if (options->hpn_disabled <= 0) {
++			if (options->hpn_buffer_size == 0)
++				options->hpn_buffer_size = 1;
++			/* limit the maximum buffer to 64MB */
++			if (options->hpn_buffer_size > 64*1024) {
++				options->hpn_buffer_size = 64*1024*1024;
++			} else {
++				options->hpn_buffer_size *= 1024;
++			}
++		} else
++			options->hpn_buffer_size = CHAN_TCP_WINDOW_DEFAULT;
++	}
++
+ 	if (options->ip_qos_interactive == -1)
+ 		options->ip_qos_interactive = IPTOS_LOWDELAY;
+ 	if (options->ip_qos_bulk == -1)
+@@ -413,6 +452,7 @@
+ 	sHostCertificate,
+ 	sRevokedKeys, sTrustedUserCAKeys, sAuthorizedPrincipalsFile,
+ 	sAuthorizedPrincipalsCommand, sAuthorizedPrincipalsCommandUser,
++	sTcpRcvBufPoll, sHPNDisabled, sHPNBufferSize,
+ 	sKexAlgorithms, sIPQoS, sVersionAddendum,
+ 	sAuthorizedKeysCommand, sAuthorizedKeysCommandUser,
+ 	sAuthenticationMethods, sHostKeyAgent, sPermitUserRC,
+@@ -548,6 +588,9 @@
+ 	{ "revokedkeys", sRevokedKeys, SSHCFG_ALL },
+ 	{ "trustedusercakeys", sTrustedUserCAKeys, SSHCFG_ALL },
+ 	{ "authorizedprincipalsfile", sAuthorizedPrincipalsFile, SSHCFG_ALL },
++	{ "hpndisabled", sHPNDisabled, SSHCFG_ALL },
++	{ "hpnbuffersize", sHPNBufferSize, SSHCFG_ALL },
++	{ "tcprcvbufpoll", sTcpRcvBufPoll, SSHCFG_ALL },
+ 	{ "kexalgorithms", sKexAlgorithms, SSHCFG_GLOBAL },
+ 	{ "ipqos", sIPQoS, SSHCFG_ALL },
+ 	{ "authorizedkeyscommand", sAuthorizedKeysCommand, SSHCFG_ALL },
+@@ -587,6 +630,7 @@
+ 
+ 	for (i = 0; keywords[i].name; i++)
+ 		if (strcasecmp(cp, keywords[i].name) == 0) {
++			debug ("Config token is %s", keywords[i].name);
+ 			*flags = keywords[i].flags;
+ 			return keywords[i].opcode;
+ 		}
+@@ -1148,6 +1192,19 @@
+ 		if (*activep && *intptr == -1)
+ 			*intptr = value;
+ 		break;
++
++
++	case sTcpRcvBufPoll:
++		intptr = &options->tcp_rcv_buf_poll;
++		goto parse_flag;
++
++	case sHPNDisabled:
++		intptr = &options->hpn_disabled;
++		goto parse_flag;
++
++	case sHPNBufferSize:
++		intptr = &options->hpn_buffer_size;
++		goto parse_int;
+ 
+ 	case sIgnoreUserKnownHosts:
+ 		intptr = &options->ignore_user_known_hosts;
+--- a/servconf.h
++++ b/servconf.h
+@@ -166,6 +166,9 @@
+ 	char   *adm_forced_command;
+ 
+ 	int	use_pam;		/* Enable auth via PAM */
++        int     tcp_rcv_buf_poll;       /* poll tcp rcv window in autotuning kernels*/
++	int	hpn_disabled;		/* disable hpn functionality. false by default */
++	int	hpn_buffer_size;	/* set the hpn buffer size - default 3MB */
+ 
+ 	int	permit_tun;
+ 
+--- a/serverloop.c
++++ b/serverloop.c
+@@ -526,8 +526,12 @@
+ 	sock = tun_open(tun, mode);
+ 	if (sock < 0)
+ 		goto done;
++	if (options.hpn_disabled)
+ 	c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1,
+ 	    CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
++	else
++		c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1,
++		    options.hpn_buffer_size, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
+ 	c->datagram = 1;
+ #if defined(SSH_TUN_FILTER)
+ 	if (mode == SSH_TUNMODE_POINTOPOINT)
+@@ -563,6 +567,8 @@
+ 	c = channel_new("session", SSH_CHANNEL_LARVAL,
+ 	    -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT,
+ 	    0, "server-session", 1);
++	if ((options.tcp_rcv_buf_poll) && (!options.hpn_disabled))
++		c->dynamic_window = 1;
+ 	if (session_open(the_authctxt, c->self) != 1) {
+ 		debug("session open failed, free channel %d", c->self);
+ 		channel_free(c);
+--- a/session.c
++++ b/session.c
+@@ -220,6 +220,7 @@
+ 		goto authsock_err;
+ 
+ 	/* Allocate a channel for the authentication agent socket. */
++	/* this shouldn't matter if its hpn or not - cjr */
+ 	nc = channel_new("auth socket",
+ 	    SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
+ 	    CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
+@@ -2121,10 +2122,16 @@
+ 	 */
+ 	if (s->chanid == -1)
+ 		fatal("no channel for session %d", s->self);
++	if (options.hpn_disabled)
+ 	channel_set_fds(s->chanid,
+ 	    fdout, fdin, fderr,
+ 	    ignore_fderr ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
+ 	    1, is_tty, CHAN_SES_WINDOW_DEFAULT);
++	else
++		channel_set_fds(s->chanid,
++		    fdout, fdin, fderr,
++		    ignore_fderr ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
++		    1, is_tty, options.hpn_buffer_size);
+ }
+ 
+ /*
+--- a/sftp.1
++++ b/sftp.1
+@@ -266,7 +266,8 @@
+ Specify how many requests may be outstanding at any one time.
+ Increasing this may slightly improve file transfer speed
+ but will increase memory usage.
+-The default is 64 outstanding requests.
++The default is 256 outstanding requests providing for 8MB
++of outstanding data with a 32KB buffer.
+ .It Fl r
+ Recursively copy entire directories when uploading and downloading.
+ Note that
+--- a/sftp.c
++++ b/sftp.c
+@@ -72,7 +72,7 @@
+ #include "sftp-client.h"
+ 
+ #define DEFAULT_COPY_BUFLEN	32768	/* Size of buffer for up/download */
+-#define DEFAULT_NUM_REQUESTS	64	/* # concurrent outstanding requests */
++#define DEFAULT_NUM_REQUESTS	256	/* # concurrent outstanding requests */
+ 
+ /* File to read commands from */
+ FILE* infile;
+--- a/ssh.c
++++ b/ssh.c
+@@ -1910,6 +1910,9 @@
+ {
+ 	Channel *c;
+ 	int window, packetmax, in, out, err;
++	int sock;
++	int socksize;
++	int socksizelen = sizeof(int);
+ 
+ 	if (stdin_null_flag) {
+ 		in = open(_PATH_DEVNULL, O_RDONLY);
+@@ -1930,9 +1933,74 @@
+ 	if (!isatty(err))
+ 		set_nonblock(err);
+ 
+-	window = CHAN_SES_WINDOW_DEFAULT;
++	/* we need to check to see if what they want to do about buffer */
++	/* sizes here. In a hpn to nonhpn connection we want to limit */
++	/* the window size to something reasonable in case the far side */
++	/* has the large window bug. In hpn to hpn connection we want to */
++	/* use the max window size but allow the user to override it */
++	/* lastly if they disabled hpn then use the ssh std window size */
++
++	/* so why don't we just do a getsockopt() here and set the */
++	/* ssh window to that? In the case of a autotuning receive */
++	/* window the window would get stuck at the initial buffer */
++	/* size generally less than 96k. Therefore we need to set the */
++	/* maximum ssh window size to the maximum hpn buffer size */
++	/* unless the user has specifically set the tcprcvbufpoll */
++	/* to no. In which case we *can* just set the window to the */
++	/* minimum of the hpn buffer size and tcp receive buffer size */
++
++	if (tty_flag)
++		options.hpn_buffer_size = CHAN_SES_WINDOW_DEFAULT;
++	else
++		options.hpn_buffer_size = 2*1024*1024;
++
++	if (datafellows & SSH_BUG_LARGEWINDOW)
++	{
++		debug("HPN to Non-HPN Connection");
++	}
++	else
++	{
++		if (options.tcp_rcv_buf_poll <= 0)
++		{
++			sock = socket(AF_INET, SOCK_STREAM, 0);
++			getsockopt(sock, SOL_SOCKET, SO_RCVBUF,
++				   &socksize, &socksizelen);
++			close(sock);
++			debug("socksize %d", socksize);
++			options.hpn_buffer_size = socksize;
++			debug ("HPNBufferSize set to TCP RWIN: %d", options.hpn_buffer_size);
++		}
++		else
++		{
++			if (options.tcp_rcv_buf > 0)
++			{
++				/*create a socket but don't connect it */
++				/* we use that the get the rcv socket size */
++				sock = socket(AF_INET, SOCK_STREAM, 0);
++				/* if they are using the tcp_rcv_buf option */
++				/* attempt to set the buffer size to that */
++				if (options.tcp_rcv_buf)
++					setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (void *)&options.tcp_rcv_buf,
++						   sizeof(options.tcp_rcv_buf));
++				getsockopt(sock, SOL_SOCKET, SO_RCVBUF,
++					   &socksize, &socksizelen);
++				close(sock);
++				debug("socksize %d", socksize);
++				options.hpn_buffer_size = socksize;
++				debug ("HPNBufferSize set to user TCPRcvBuf: %d", options.hpn_buffer_size);
++			}
++ 		}
++	}
++
++	debug("Final hpn_buffer_size = %d", options.hpn_buffer_size);
++
++	window = options.hpn_buffer_size;
++
++	channel_set_hpn(options.hpn_disabled, options.hpn_buffer_size);
++
+ 	packetmax = CHAN_SES_PACKET_DEFAULT;
+ 	if (tty_flag) {
++		window = 4*CHAN_SES_PACKET_DEFAULT;
+ 		window >>= 1;
+ 		packetmax >>= 1;
+ 	}
+@@ -1941,6 +2009,10 @@
+ 	    window, packetmax, CHAN_EXTENDED_WRITE,
+ 	    "client-session", /*nonblock*/0);
+ 
++	if ((options.tcp_rcv_buf_poll > 0) && (!options.hpn_disabled)) {
++		c->dynamic_window = 1;
++		debug ("Enabled Dynamic Window Scaling");
++	}
+ 	debug3("ssh_session2_open: channel_new: %d", c->self);
+ 
+ 	channel_send_open(c->self);
+--- a/sshconnect.c
++++ b/sshconnect.c
+@@ -267,6 +267,31 @@
+ }
+ 
+ /*
++ * Set TCP receive buffer if requested.
++ * Note: tuning needs to happen after the socket is
++ * created but before the connection happens
++ * so winscale is negotiated properly -cjr
++ */
++static void
++ssh_set_socket_recvbuf(int sock)
++{
++	void *buf = (void *)&options.tcp_rcv_buf;
++	int sz = sizeof(options.tcp_rcv_buf);
++	int socksize;
++	int socksizelen = sizeof(int);
++
++	debug("setsockopt Attempting to set SO_RCVBUF to %d", options.tcp_rcv_buf);
++	if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, buf, sz) >= 0) {
++	  getsockopt(sock, SOL_SOCKET, SO_RCVBUF, &socksize, &socksizelen);
++	  debug("setsockopt SO_RCVBUF: %.100s %d", strerror(errno), socksize);
++	}
++	else
++		error("Couldn't set socket receive buffer to %d: %.100s",
++		    options.tcp_rcv_buf, strerror(errno));
++}
++
++
++/*
+  * Creates a (possibly privileged) socket for use as the ssh connection.
+  */
+ static int
+@@ -282,6 +307,9 @@
+ 	}
+ 	fcntl(sock, F_SETFD, FD_CLOEXEC);
+ 
++	if (options.tcp_rcv_buf > 0)
++		ssh_set_socket_recvbuf(sock);
++
+ 	/* Bind the socket to an alternative local IP address */
+ 	if (options.bind_address == NULL && !privileged)
+ 		return sock;
+@@ -526,10 +554,10 @@
+ 	/* Send our own protocol version identification. */
+ 	if (compat20) {
+ 		xasprintf(&client_version_string, "SSH-%d.%d-%.100s\r\n",
+-		    PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, SSH_VERSION);
++		    PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, SSH_RELEASE);
+ 	} else {
+ 		xasprintf(&client_version_string, "SSH-%d.%d-%.100s\n",
+-		    PROTOCOL_MAJOR_1, minor1, SSH_VERSION);
++		    PROTOCOL_MAJOR_1, minor1, SSH_RELEASE);
+ 	}
+ 	if (atomicio(vwrite, connection_out, client_version_string,
+ 	    strlen(client_version_string)) != strlen(client_version_string))
+--- a/sshd.c
++++ b/sshd.c
+@@ -1020,6 +1020,8 @@
+ 	int ret, listen_sock, on = 1;
+ 	struct addrinfo *ai;
+ 	char ntop[NI_MAXHOST], strport[NI_MAXSERV];
++	int socksize;
++	int socksizelen = sizeof(int);
+ 
+ 	for (ai = options.listen_addrs; ai; ai = ai->ai_next) {
+ 		if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
+@@ -1060,6 +1062,11 @@
+ 
+ 		debug("Bind to port %s on %s.", strport, ntop);
+ 
++		getsockopt(listen_sock, SOL_SOCKET, SO_RCVBUF,
++				   &socksize, &socksizelen);
++		debug("Server TCP RWIN socket size: %d", socksize);
++		debug("HPN Buffer Size: %d", options.hpn_buffer_size);
++
+ 		/* Bind the socket to the desired port. */
+ 		if (bind(listen_sock, ai->ai_addr, ai->ai_addrlen) < 0) {
+ 			error("Bind to port %s on %s failed: %.200s.",
+@@ -1977,6 +1984,9 @@
+ 	verbose("Connection from %s port %d on %s port %d",
+ 	    remote_ip, remote_port, laddr,  ssh_local_port(ssh));
+ 	free(laddr);
++
++	/* set the HPN options for the child */
++	channel_set_hpn(options.hpn_disabled, options.hpn_buffer_size);
+ 
+ 	/*
+ 	 * We don't want to listen forever unless the other side
+--- a/sshd_config
++++ b/sshd_config
+@@ -99,7 +99,7 @@
+ #ClientAliveInterval 0
+ #ClientAliveCountMax 3
+ #UseDNS no
+-#PidFile /var/run/sshd.pid
++#PidFile /run/sshd.pid
+ #MaxStartups 10:30:100
+ #PermitTunnel no
+ #ChrootDirectory none
+@@ -109,7 +109,18 @@
+ #Banner none
+ 
+ # override default of no subsystems
+-Subsystem	sftp	/usr/libexec/sftp-server
++Subsystem	sftp	/usr/lib/ssh/sftp-server
++
++# the following are HPN related configuration options
++# tcp receive buffer polling. disable in non autotuning kernels
++#TcpRcvBufPoll yes
++ 
++# disable hpn performance boosts
++#HPNDisabled no
++
++# buffer size for hpn to non-hpn connections
++#HPNBufferSize 2048
++
+ 
+ # Example of overriding settings on a per-user basis
+ #Match User anoncvs
+--- a/version.h
++++ b/version.h
+@@ -3,4 +3,5 @@
+ #define SSH_VERSION	"OpenSSH_7.4"
+ 
+ #define SSH_PORTABLE	"p1"
+-#define SSH_RELEASE	SSH_VERSION SSH_PORTABLE
++#define SSH_HPN		"-hpn14v4"
++#define SSH_RELEASE	SSH_VERSION SSH_PORTABLE SSH_HPN