From 716ca530e1c4515d8683c9d5be3d56b301758b66 Mon Sep 17 00:00:00 2001
From: James <>
Date: Wed, 4 Nov 2015 11:49:21 +0000
Subject: trunk-47381

---
 .../ppp/patches/121-debian_adaptive_lcp_echo.patch | 56 ++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 package/network/services/ppp/patches/121-debian_adaptive_lcp_echo.patch

(limited to 'package/network/services/ppp/patches/121-debian_adaptive_lcp_echo.patch')

diff --git a/package/network/services/ppp/patches/121-debian_adaptive_lcp_echo.patch b/package/network/services/ppp/patches/121-debian_adaptive_lcp_echo.patch
new file mode 100644
index 0000000..b7a6240
--- /dev/null
+++ b/package/network/services/ppp/patches/121-debian_adaptive_lcp_echo.patch
@@ -0,0 +1,56 @@
+--- a/pppd/lcp.c
++++ b/pppd/lcp.c
+@@ -73,6 +73,7 @@ static void lcp_delayed_up __P((void *))
+  */
+ int	lcp_echo_interval = 0; 	/* Interval between LCP echo-requests */
+ int	lcp_echo_fails = 0;	/* Tolerance to unanswered echo-requests */
++bool	lcp_echo_adaptive = 0;	/* request echo only if the link was idle */
+ bool	lax_recv = 0;		/* accept control chars in asyncmap */
+ bool	noendpoint = 0;		/* don't send/accept endpoint discriminator */
+ 
+@@ -151,6 +152,8 @@ static option_t lcp_option_list[] = {
+       OPT_PRIO },
+     { "lcp-echo-interval", o_int, &lcp_echo_interval,
+       "Set time in seconds between LCP echo requests", OPT_PRIO },
++    { "lcp-echo-adaptive", o_bool, &lcp_echo_adaptive,
++      "Suppress LCP echo requests if traffic was received", 1 },
+     { "lcp-restart", o_int, &lcp_fsm[0].timeouttime,
+       "Set time in seconds between LCP retransmissions", OPT_PRIO },
+     { "lcp-max-terminate", o_int, &lcp_fsm[0].maxtermtransmits,
+@@ -2331,6 +2334,22 @@ LcpSendEchoRequest (f)
+ 	}
+     }
+ 
++    /*
++     * If adaptive echos have been enabled, only send the echo request if
++     * no traffic was received since the last one.
++     */
++    if (lcp_echo_adaptive) {
++	static unsigned int last_pkts_in = 0;
++
++	update_link_stats(f->unit);
++	link_stats_valid = 0;
++
++	if (link_stats.pkts_in != last_pkts_in) {
++	    last_pkts_in = link_stats.pkts_in;
++	    return;
++	}
++    }
++
+     /*
+      * Make and send the echo request frame.
+      */
+--- a/pppd/pppd.8
++++ b/pppd/pppd.8
+@@ -563,6 +563,11 @@ to 1) if the \fIproxyarp\fR option is us
+ dynamic IP address option (i.e. set /proc/sys/net/ipv4/ip_dynaddr to
+ 1) in demand mode if the local address changes.
+ .TP
++.B lcp\-echo\-adaptive
++If this option is used with the \fIlcp\-echo\-failure\fR option then
++pppd will send LCP echo\-request frames only if no traffic was received
++from the peer since the last echo\-request was sent.
++.TP
+ .B lcp\-echo\-failure \fIn
+ If this option is given, pppd will presume the peer to be dead
+ if \fIn\fR LCP echo\-requests are sent without receiving a valid LCP
-- 
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