From a34e76b707355a2bdaee0cda243f4f82ef17eb9a Mon Sep 17 00:00:00 2001
From: Hans Dedecker <dedeckeh@gmail.com>
Date: Thu, 13 Nov 2014 15:57:59 +0000
Subject: [PATCH] netifd: Add acceptlocal config support

Adds support to accept packets with local source address.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
---
 device.c       |  9 +++++++++
 device.h       |  3 +++
 system-linux.c | 18 ++++++++++++++++++
 3 files changed, 30 insertions(+)

diff --git a/device.c b/device.c
index d261e25..aa5818f 100644
--- a/device.c
+++ b/device.c
@@ -40,6 +40,7 @@ static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
 	[DEV_ATTR_IPV6] = { .name = "ipv6", .type = BLOBMSG_TYPE_BOOL },
 	[DEV_ATTR_PROMISC] = { .name = "promisc", .type = BLOBMSG_TYPE_BOOL },
 	[DEV_ATTR_RPFILTER] = { .name = "rpfilter", .type = BLOBMSG_TYPE_STRING },
+	[DEV_ATTR_ACCEPTLOCAL] = { .name = "acceptlocal", .type = BLOBMSG_TYPE_BOOL },
 };
 
 const struct uci_blob_param_list device_attr_list = {
@@ -156,6 +157,7 @@ device_merge_settings(struct device *dev, struct device_settings *n)
 	n->ipv6 = s->flags & DEV_OPT_IPV6 ? s->ipv6 : os->ipv6;
 	n->promisc = s->flags & DEV_OPT_PROMISC ? s->promisc : os->promisc;
 	n->rpfilter = s->flags & DEV_OPT_RPFILTER ? s->rpfilter : os->rpfilter;
+	n->acceptlocal = s->flags & DEV_OPT_ACCEPTLOCAL ? s->acceptlocal : os->acceptlocal;
 	n->flags = s->flags | os->flags;
 }
 
@@ -206,6 +208,11 @@ device_init_settings(struct device *dev, struct blob_attr **tb)
 			DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 	}
 
+	if ((cur = tb[DEV_ATTR_ACCEPTLOCAL])) {
+		s->acceptlocal = blobmsg_get_bool(cur);
+		s->flags |= DEV_OPT_ACCEPTLOCAL;
+	}
+
 	device_set_disabled(dev, disabled);
 }
 
@@ -745,6 +752,8 @@ device_dump_status(struct blob_buf *b, struct device *dev)
 			blobmsg_add_u8(b, "promisc", st.promisc);
 		if (st.flags & DEV_OPT_RPFILTER)
 			blobmsg_add_u32(b, "rpfilter", st.rpfilter);
+		if (st.flags & DEV_OPT_ACCEPTLOCAL)
+			blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
 	}
 
 	s = blobmsg_open_table(b, "statistics");
diff --git a/device.h b/device.h
index 0af65be..8569be7 100644
--- a/device.h
+++ b/device.h
@@ -34,6 +34,7 @@ enum {
 	DEV_ATTR_IPV6,
 	DEV_ATTR_PROMISC,
 	DEV_ATTR_RPFILTER,
+	DEV_ATTR_ACCEPTLOCAL,
 	__DEV_ATTR_MAX,
 };
 
@@ -68,6 +69,7 @@ enum {
 	DEV_OPT_IPV6		= (1 << 3),
 	DEV_OPT_PROMISC		= (1 << 4),
 	DEV_OPT_RPFILTER	= (1 << 5),
+	DEV_OPT_ACCEPTLOCAL	= (1 << 6),
 };
 
 /* events broadcasted to all users of a device */
@@ -116,6 +118,7 @@ struct device_settings {
 	bool ipv6;
 	bool promisc;
 	unsigned int rpfilter;
+	bool acceptlocal;
 };
 
 /*
diff --git a/system-linux.c b/system-linux.c
index bb7ccf9..83827d5 100644
--- a/system-linux.c
+++ b/system-linux.c
@@ -270,6 +270,11 @@ static void system_set_rpfilter(struct device *dev, const char *val)
 	system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/rp_filter", dev->ifname, val);
 }
 
+static void system_set_acceptlocal(struct device *dev, const char *val)
+{
+	system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/accept_local", dev->ifname, val);
+}
+
 static int system_get_sysctl(const char *path, char *buf, const size_t buf_sz)
 {
 	int fd = -1, ret = -1;
@@ -310,6 +315,12 @@ static int system_get_rpfilter(struct device *dev, char *buf, const size_t buf_s
 			dev->ifname, buf, buf_sz);
 }
 
+static int system_get_acceptlocal(struct device *dev, char *buf, const size_t buf_sz)
+{
+	return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/accept_local",
+			dev->ifname, buf, buf_sz);
+}
+
 // Evaluate netlink messages
 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
 {
@@ -969,6 +980,11 @@ system_if_get_settings(struct device *dev, struct device_settings *s)
 		s->rpfilter = strtoul(buf, NULL, 0);
 		s->flags |= DEV_OPT_RPFILTER;
 	}
+
+	if (!system_get_acceptlocal(dev, buf, sizeof(buf))) {
+		s->acceptlocal = strtoul(buf, NULL, 0);
+		s->flags |= DEV_OPT_ACCEPTLOCAL;
+	}
 }
 
 void
@@ -1010,6 +1026,8 @@ system_if_apply_settings(struct device *dev, struct device_settings *s, unsigned
 		snprintf(buf, sizeof(buf), "%d", s->rpfilter);
 		system_set_rpfilter(dev, buf);
 	}
+	if (s->flags & DEV_OPT_ACCEPTLOCAL & apply_mask)
+		system_set_acceptlocal(dev, s->acceptlocal ? "1" : "0");
 }
 
 int system_if_up(struct device *dev)
-- 
2.25.1