netdev - [PATCH v2 16/18] gtp: add genl cmd to enable GTP encapsulation on UDP socket

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Message-Id: <20170124152848.6120-17-aschultz@tpip.net>
Date:   Tue, 24 Jan 2017 16:28:46 +0100
From:   Andreas Schultz <aschultz@...p.net>
To:     Pablo Neira <pablo@...filter.org>
Cc:     netdev@...r.kernel.org,
        Lionel Gauthier <Lionel.Gauthier@...ecom.fr>,
        openbsc@...ts.osmocom.org, Harald Welte <laforge@...monks.org>
Subject: [PATCH v2 16/18] gtp: add genl cmd to enable GTP encapsulation on UDP socket

Signed-off-by: Andreas Schultz <aschultz@...p.net>
---
 drivers/net/gtp.c        | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 include/uapi/linux/gtp.h |  4 ++++
 2 files changed, 52 insertions(+)

diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index 9e5f858..c6c1f0d 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -1247,6 +1247,46 @@ static int gtp_genl_dump_pdp(struct sk_buff *skb,
 	return skb->len;
 }
 
+static int gtp_genl_enable_socket(struct sk_buff *skb, struct genl_info *info)
+{
+	u32 version, fd, hashsize;
+	struct socket *sock;
+
+	if (!info->attrs[GTPA_VERSION] ||
+	    !info->attrs[GTPA_FD])
+		return -EINVAL;
+
+	if (!info->attrs[GTPA_PDP_HASHSIZE])
+		hashsize = 1024;
+	else
+		hashsize = nla_get_u32(info->attrs[IFLA_GTP_PDP_HASHSIZE]);
+
+	version = nla_get_u32(info->attrs[GTPA_VERSION]);
+	fd = nla_get_u32(info->attrs[GTPA_FD]);
+
+	switch (version) {
+	case GTP_V0:
+		sock = gtp_encap_enable_socket(fd, UDP_ENCAP_GTP0, hashsize);
+		break;
+
+	case GTP_V1:
+		sock = gtp_encap_enable_socket(fd, UDP_ENCAP_GTP1U, hashsize);
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	if (!sock)
+		return -EINVAL;
+
+	if (IS_ERR(sock))
+		return PTR_ERR(sock);
+
+	sockfd_put(sock);
+	return 0;
+}
+
 static struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = {
 	[GTPA_LINK]		= { .type = NLA_U32, },
 	[GTPA_VERSION]		= { .type = NLA_U32, },
@@ -1257,6 +1297,8 @@ static struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = {
 	[GTPA_NET_NS_FD]	= { .type = NLA_U32, },
 	[GTPA_I_TEI]		= { .type = NLA_U32, },
 	[GTPA_O_TEI]		= { .type = NLA_U32, },
+	[GTPA_PDP_HASHSIZE]	= { .type = NLA_U32, },
+	[GTPA_FD]		= { .type = NLA_U32, },
 };
 
 static const struct genl_ops gtp_genl_ops[] = {
@@ -1279,6 +1321,12 @@ static const struct genl_ops gtp_genl_ops[] = {
 		.policy = gtp_genl_policy,
 		.flags = GENL_ADMIN_PERM,
 	},
+	{
+		.cmd = GTP_CMD_ENABLE_SOCKET,
+		.doit = gtp_genl_enable_socket,
+		.policy = gtp_genl_policy,
+		.flags = GENL_ADMIN_PERM,
+	},
 };
 
 static struct genl_family gtp_genl_family __ro_after_init = {
diff --git a/include/uapi/linux/gtp.h b/include/uapi/linux/gtp.h
index 72a04a0..a9e9fe0 100644
--- a/include/uapi/linux/gtp.h
+++ b/include/uapi/linux/gtp.h
@@ -6,6 +6,8 @@ enum gtp_genl_cmds {
 	GTP_CMD_DELPDP,
 	GTP_CMD_GETPDP,
 
+	GTP_CMD_ENABLE_SOCKET,
+
 	GTP_CMD_MAX,
 };
 
@@ -26,6 +28,8 @@ enum gtp_attrs {
 	GTPA_I_TEI,	/* for GTPv1 only */
 	GTPA_O_TEI,	/* for GTPv1 only */
 	GTPA_PAD,
+	GTPA_PDP_HASHSIZE,
+	GTPA_FD,
 	__GTPA_MAX,
 };
 #define GTPA_MAX (__GTPA_MAX + 1)
-- 
2.10.2