get version number through generic netlink

Makefile

@@ -42,7 +42,7 @@ gtp5g-y += api_version.o
 gtp5g-y += log.o util.o
 gtp5g-y += dev.o genl.o net.o link.o proc.o
 gtp5g-y += gtp.o pktinfo.o hash.o seid.o encap.o
-gtp5g-y += pdr.o far.o qer.o bar.o urr.o genl.o genl_pdr.o genl_far.o genl_qer.o genl_bar.o genl_urr.o
+gtp5g-y += pdr.o far.o qer.o bar.o urr.o genl.o genl_pdr.o genl_far.o genl_qer.o genl_bar.o genl_urr.o genl_version.o
 
 default: module
 

genl.c

@@ -7,6 +7,7 @@
 #include "genl_qer.h"
 #include "genl_bar.h"
 #include "genl_urr.h"
+#include "genl_version.h"
 
 static const struct nla_policy gtp5g_genl_pdr_policy[GTP5G_PDR_ATTR_MAX + 1] = {
     [GTP5G_PDR_ID]                              = { .type = NLA_U32, },
@@ -134,6 +135,11 @@ static const struct genl_ops gtp5g_genl_ops[] = {
         .dumpit = gtp5g_genl_dump_bar,
         .flags = GENL_ADMIN_PERM,
     }, 
+    {
+        .cmd = GTP5G_CMD_GET_VERSION,
+        .doit = gtp5g_genl_get_version,
+        .flags = GENL_ADMIN_PERM,
+    },
 };
 
 struct genl_family gtp5g_genl_family __ro_after_init = {

genl.h

@@ -29,6 +29,8 @@ enum gtp5g_cmd {
      * free5GC's UPF or libgtp5gnl
      * */
 
+    GTP5G_CMD_GET_VERSION,
+
     __GTP5G_CMD_MAX,
 };
 #define GTP5G_CMD_MAX (__GTP5G_CMD_MAX - 1)

genl_version.c

@@ -0,0 +1,47 @@
+#include "genl_version.h"
+
+static int gtp5g_genl_fill_ver(struct sk_buff *skb, u32 snd_portid, u32 snd_seq,
+        u32 type)
+{
+    void *genlh;
+
+    genlh = genlmsg_put(skb, snd_portid, snd_seq, &gtp5g_genl_family, 0, type);
+    if (!genlh)
+        goto genlmsg_fail;
+
+    if (nla_put_string(skb, GTP5G_VERSION, DRV_VERSION))
+        goto genlmsg_fail;
+
+    genlmsg_end(skb, genlh);
+    return 0;
+
+genlmsg_fail:
+    genlmsg_cancel(skb, genlh);
+    return -EMSGSIZE;
+}
+
+int gtp5g_genl_get_version(struct sk_buff *skb, struct genl_info *info)
+{
+    struct sk_buff *skb_ack;
+    int err;
+
+    skb_ack = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
+    if (!skb_ack) {
+        rcu_read_unlock();
+        return -ENOMEM;
+    }
+
+    err = gtp5g_genl_fill_ver(skb_ack,
+            NETLINK_CB(skb).portid,
+            info->snd_seq,
+            info->nlhdr->nlmsg_type);
+    if (err) {
+        kfree_skb(skb_ack);
+        rcu_read_unlock();
+        return err;
+    }
+
+    rcu_read_unlock();
+
+    return genlmsg_unicast(genl_info_net(info), skb_ack, info->snd_portid);
+}  

genl_version.h

@@ -0,0 +1,14 @@
+#ifndef __GENL_VERSION_H__
+#define __GENL_VERSION_H__
+
+#include "genl.h"
+
+#define DRV_VERSION "0.6.4"
+
+enum gtp5g_version {
+    GTP5G_VERSION
+};
+
+extern int gtp5g_genl_get_version(struct sk_buff *, struct genl_info *);
+
+#endif // __GENL_VERSION_H__

main.c

@@ -6,8 +6,7 @@
 #include "proc.h"
 #include "hash.h"
 #include "log.h"
-
-#define DRV_VERSION "0.6.3"
+#include "genl_version.h"
 
 static int __init gtp5g_init(void)
 {