From 99499fdbe5221847288a6d18edf1032d2702cff9 Mon Sep 17 00:00:00 2001
From: Jo-Philipp Wich <jow@openwrt.org>
Date: Fri, 22 Feb 2013 14:30:21 +0100
Subject: [PATCH] add support for setting sysctls, remove tcp_westwood option,
 its not present on current kernels

---
 defaults.c | 31 ++++++++++++++++++++++++++++++-
 defaults.h |  2 ++
 main.c     | 12 ++++++++----
 options.h  |  1 -
 4 files changed, 40 insertions(+), 6 deletions(-)

diff --git a/defaults.c b/defaults.c
index d2037f8..7f41c83 100644
--- a/defaults.c
+++ b/defaults.c
@@ -74,7 +74,6 @@ const struct fw3_option fw3_default_opts[] = {
 
 	FW3_OPT("tcp_syncookies",      bool,     defaults, tcp_syncookies),
 	FW3_OPT("tcp_ecn",             bool,     defaults, tcp_ecn),
-	FW3_OPT("tcp_westwood",        bool,     defaults, tcp_westwood),
 	FW3_OPT("tcp_window_scaling",  bool,     defaults, tcp_window_scaling),
 
 	FW3_OPT("accept_redirects",    bool,     defaults, accept_redirects),
@@ -289,6 +288,36 @@ fw3_print_default_tail_rules(enum fw3_table table, enum fw3_family family,
 }
 
 static void
+set_default(const char *name, bool set)
+{
+	FILE *f;
+	char path[sizeof("/proc/sys/net/ipv4/tcp_window_scaling\0")];
+
+	snprintf(path, sizeof(path), "/proc/sys/net/ipv4/tcp_%s", name);
+
+	info(" * Set tcp_%s to %s", name, set ? "on" : "off", name);
+
+	if (!(f = fopen(path, "w")))
+	{
+		info("   ! Unable to write value: %s", strerror(errno));
+		return;
+	}
+
+	fprintf(f, "%u\n", set);
+	fclose(f);
+}
+
+void
+fw3_set_defaults(struct fw3_state *state)
+{
+	info("Setting sysctl values");
+
+	set_default("ecn",            state->defaults.tcp_ecn);
+	set_default("syncookies",     state->defaults.tcp_syncookies);
+	set_default("window_scaling", state->defaults.tcp_window_scaling);
+}
+
+static void
 reset_policy(enum fw3_table table)
 {
 	if (table != FW3_TABLE_FILTER)
diff --git a/defaults.h b/defaults.h
index 562b895..29babd8 100644
--- a/defaults.h
+++ b/defaults.h
@@ -34,6 +34,8 @@ void fw3_print_default_head_rules(enum fw3_table table, enum fw3_family family,
 void fw3_print_default_tail_rules(enum fw3_table table, enum fw3_family family,
                                   struct fw3_state *state);
 
+void fw3_set_defaults(struct fw3_state *state);
+
 void fw3_flush_rules(enum fw3_table table, enum fw3_family family,
                      bool pass2, struct fw3_state *state);
 
diff --git a/main.c b/main.c
index 6eb002f..65de9f5 100644
--- a/main.c
+++ b/main.c
@@ -240,11 +240,15 @@ start(struct fw3_state *state, bool reload)
 	enum fw3_family family;
 	enum fw3_table table;
 
-	if (!print_rules && !reload &&
-	    fw3_command_pipe(false, "ipset", "-exist", "-"))
+	if (!print_rules && !reload)
 	{
-		fw3_create_ipsets(state);
-		fw3_command_close();
+		fw3_set_defaults(state);
+
+		if (fw3_command_pipe(false, "ipset", "-exist", "-"))
+		{
+			fw3_create_ipsets(state);
+			fw3_command_close();
+		}
 	}
 
 	for (family = FW3_FAMILY_V4; family <= FW3_FAMILY_V6; family++)
diff --git a/options.h b/options.h
index a9257a3..96afcd2 100644
--- a/options.h
+++ b/options.h
@@ -228,7 +228,6 @@ struct fw3_defaults
 
 	bool tcp_syncookies;
 	bool tcp_ecn;
-	bool tcp_westwood;
 	bool tcp_window_scaling;
 
 	bool accept_redirects;
-- 
2.11.0