[PATCH net-next 2/4] gtp: add genl cmd to enable GTP encapsulation on UDP socket

[Andreas Schultz]

Signed-off-by: Andreas Schultz <aschu...@tpip.net>
---
 drivers/net/gtp.c        | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 include/uapi/linux/gtp.h |  4 ++++
 2 files changed, 51 insertions(+)

diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index 66616f7..c4cf1b9 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -1244,6 +1244,45 @@ 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 sock *sk;
+
+       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:
+               sk = gtp_encap_enable_socket(fd, UDP_ENCAP_GTP0, hashsize);
+               break;
+
+       case GTP_V1:
+               sk = gtp_encap_enable_socket(fd, UDP_ENCAP_GTP1U, hashsize);
+               break;
+
+       default:
+               return -EINVAL;
+       }
+
+       if (!sk)
+               return -EINVAL;
+
+       if (IS_ERR(sk))
+               return PTR_ERR(sk);
+
+       return 0;
+}
+
 static struct nla_policy gtp_genl_policy[GTPA_MAX + 1] = {
        [GTPA_LINK]             = { .type = NLA_U32, },
        [GTPA_VERSION]          = { .type = NLA_U32, },
@@ -1254,6 +1293,8 @@ 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[] = {
@@ -1276,6 +1317,12 @@ 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