From 4f60845552024419ecf8ad2c20cf108be7be4e04 Mon Sep 17 00:00:00 2001
From: Alexander Couzens <lynxis@fe80.eu>
Date: Sun, 11 Oct 2020 18:41:24 +0200
Subject: gprs_ns2: add gprs_ns2_ip_bind_by_sockaddr() to search for binds by
 sockaddr

Change-Id: I48c3f1a82574eee0a49e6941cf9e1365c2302d3b
---
 include/osmocom/gprs/gprs_ns2.h |  2 ++
 src/gb/gprs_ns2_udp.c           | 26 ++++++++++++++++++++++++++
 src/gb/libosmogb.map            |  1 +
 3 files changed, 29 insertions(+)

diff --git a/include/osmocom/gprs/gprs_ns2.h b/include/osmocom/gprs/gprs_ns2.h
index dc27c96c..cbd6647d 100644
--- a/include/osmocom/gprs/gprs_ns2.h
+++ b/include/osmocom/gprs/gprs_ns2.h
@@ -110,6 +110,8 @@ int gprs_ns2_ip_bind(struct gprs_ns2_inst *nsi,
 		     const struct osmo_sockaddr *local,
 		     int dscp,
 		     struct gprs_ns2_vc_bind **result);
+struct gprs_ns2_vc_bind *gprs_ns2_ip_bind_by_sockaddr(struct gprs_ns2_inst *nsi,
+						      const struct osmo_sockaddr *sockaddr);
 void gprs_ns2_bind_set_mode(struct gprs_ns2_vc_bind *bind, enum gprs_ns2_vc_mode mode);
 
 /* create a VC connection */
diff --git a/src/gb/gprs_ns2_udp.c b/src/gb/gprs_ns2_udp.c
index 815e5168..a5781606 100644
--- a/src/gb/gprs_ns2_udp.c
+++ b/src/gb/gprs_ns2_udp.c
@@ -265,6 +265,32 @@ static int nsip_fd_cb(struct osmo_fd *bfd, unsigned int what)
 	return rc;
 }
 
+/*! Find NS bind for a given socket address
+ *  \param[in] nsi NS instance
+ *  \param[in] sockaddr socket address to search for
+ *  \return
+ */
+struct gprs_ns2_vc_bind *gprs_ns2_ip_bind_by_sockaddr(struct gprs_ns2_inst *nsi,
+						      const struct osmo_sockaddr *sockaddr)
+{
+	struct gprs_ns2_vc_bind *bind;
+	struct osmo_sockaddr *local;
+
+	OSMO_ASSERT(nsi);
+	OSMO_ASSERT(sockaddr);
+
+	llist_for_each_entry(bind, &nsi->binding, list) {
+		if (!gprs_ns2_is_ip_bind(bind))
+			continue;
+
+		local = gprs_ns2_ip_bind_sockaddr(bind);
+		if (!osmo_sockaddr_cmp(sockaddr, local))
+			return bind;
+	}
+
+	return NULL;
+}
+
 /*! Bind to an IPv4/IPv6 address
  *  \param[in] nsi NS Instance in which to create the NSVC
  *  \param[in] local the local address to bind to
diff --git a/src/gb/libosmogb.map b/src/gb/libosmogb.map
index d08e85e9..980b317f 100644
--- a/src/gb/libosmogb.map
+++ b/src/gb/libosmogb.map
@@ -84,6 +84,7 @@ gprs_ns2_free_nsvc;
 gprs_ns2_frgre_bind;
 gprs_ns2_instantiate;
 gprs_ns2_ip_bind;
+gprs_ns2_ip_bind_by_sockaddr;
 gprs_ns2_ip_bind_set_dscp;
 gprs_ns2_ip_bind_sockaddr;
 gprs_ns2_ip_connect;
-- 
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