diff --git a/src/bind.c b/src/bind.c
index 9e3053c..276a1ae 100644
--- a/src/bind.c
+++ b/src/bind.c
@@ -100,19 +100,6 @@ gt_setup_mtu(struct mud *mud, const char *tun_name)
     return mtu;
 }
 
-static void
-gt_setup_port(struct sockaddr_storage *ss, uint16_t port)
-{
-    switch (ss->ss_family) {
-    case AF_INET:
-        ((struct sockaddr_in *)ss)->sin_port = htons(port);
-        break;
-    case AF_INET6:
-        ((struct sockaddr_in6 *)ss)->sin6_port = htons(port);
-        break;
-    }
-}
-
 int
 gt_bind(int argc, char **argv)
 {
@@ -150,8 +137,8 @@ gt_bind(int argc, char **argv)
     if (argz(bindz, argc, argv))
         return 1;
 
-    gt_setup_port(&bind_addr, bind_port);
-    gt_setup_port(&peer_addr, peer_port);
+    gt_set_port((struct sockaddr *)&bind_addr, bind_port);
+    gt_set_port((struct sockaddr *)&peer_addr, peer_port);
 
     unsigned char *buf = malloc(bufsize);
 
diff --git a/src/common.c b/src/common.c
index 45b1bdd..60ed176 100644
--- a/src/common.c
+++ b/src/common.c
@@ -69,3 +69,44 @@ gt_fromhex(uint8_t *dst, size_t dst_size, const char *src, size_t src_size)
 
     return 0;
 }
+
+void
+gt_set_port(struct sockaddr *sa, uint16_t port)
+{
+    switch (sa->sa_family) {
+    case AF_INET:
+        ((struct sockaddr_in *)sa)->sin_port = htons(port);
+        break;
+    case AF_INET6:
+        ((struct sockaddr_in6 *)sa)->sin6_port = htons(port);
+        break;
+    }
+}
+
+uint16_t
+gt_get_port(struct sockaddr *sa)
+{
+    switch (sa->sa_family) {
+    case AF_INET:
+        return ntohs(((struct sockaddr_in *)sa)->sin_port);
+    case AF_INET6:
+        return ntohs(((struct sockaddr_in6 *)sa)->sin6_port);
+    }
+
+    return 0;
+}
+
+int
+gt_toaddr(char *str, size_t size, struct sockaddr *sa)
+{
+    switch (sa->sa_family) {
+    case AF_INET:
+        return -!inet_ntop(AF_INET,
+                           &((struct sockaddr_in *)sa)->sin_addr, str, size);
+    case AF_INET6:
+        return -!inet_ntop(AF_INET6,
+                           &((struct sockaddr_in6 *)sa)->sin6_addr, str, size);
+    }
+
+    return -1;
+}
diff --git a/src/common.h b/src/common.h
index a242e2b..ecb9a52 100644
--- a/src/common.h
+++ b/src/common.h
@@ -1,5 +1,9 @@
 #pragma once
 
+#if defined __linux__ && !defined _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
 #include <stdlib.h>
 #include <stdint.h>
 #include <string.h>
@@ -7,6 +11,8 @@
 #include <signal.h>
 #include <errno.h>
 
+#include <arpa/inet.h>
+
 #ifndef PACKAGE_NAME
 #define PACKAGE_NAME "glorytun"
 #endif
@@ -53,3 +59,7 @@ void gt_log   (const char *, ...) _printf_(1,2);
 
 int gt_tohex   (char *, size_t, const uint8_t *, size_t);
 int gt_fromhex (uint8_t *, size_t, const char *, size_t);
+
+void     gt_set_port (struct sockaddr *, uint16_t);
+uint16_t gt_get_port (struct sockaddr *);
+int      gt_toaddr   (char *, size_t, struct sockaddr *);
diff --git a/src/path.c b/src/path.c
index a3d15a5..ed4c684 100644
--- a/src/path.c
+++ b/src/path.c
@@ -1,7 +1,6 @@
 #include "common.h"
 #include "ctl.h"
 #include "str.h"
-#include "ssutils.h"
 
 #include <stdio.h>
 #include <sys/socket.h>
@@ -25,8 +24,10 @@ gt_path_status(int fd)
         char bindstr[INET6_ADDRSTRLEN] = {0};
         char peerstr[INET6_ADDRSTRLEN] = {0};
 
-        if (gt_ss_addr(bindstr, sizeof(bindstr), &res.path_status.local_addr) ||
-            gt_ss_addr(peerstr, sizeof(peerstr), &res.path_status.addr))
+        if (gt_toaddr(bindstr, sizeof(bindstr),
+                      (struct sockaddr *)&res.path_status.local_addr) ||
+            gt_toaddr(peerstr, sizeof(peerstr),
+                      (struct sockaddr *)&res.path_status.addr))
             return -2;
 
         const char *statestr = NULL;
diff --git a/src/show.c b/src/show.c
index 752ea13..f053671 100644
--- a/src/show.c
+++ b/src/show.c
@@ -1,7 +1,6 @@
 #include "common.h"
 #include "ctl.h"
 #include "str.h"
-#include "ssutils.h"
 
 #include "../argz/argz.h"
 
@@ -22,32 +21,34 @@ gt_show_dev_status(int fd, const char *dev)
     char bindstr[INET6_ADDRSTRLEN] = {0};
     char peerstr[INET6_ADDRSTRLEN] = {0};
 
-    if (gt_ss_addr(bindstr, sizeof(bindstr), &res.status.bind))
+    if (gt_toaddr(bindstr, sizeof(bindstr),
+                  (struct sockaddr *)&res.status.bind))
         return -2;
 
-    int server = gt_ss_addr(peerstr, sizeof(peerstr), &res.status.peer);
+    int server = gt_toaddr(peerstr, sizeof(peerstr),
+                           (struct sockaddr *)&res.status.peer);
 
     if (server) {
         printf("server %s:\n"
-               "  bind:      %s port %hu\n"
+               "  bind:      %s port %"PRIu16"\n"
                "  mtu:       %zu\n"
                "  auto mtu:  %s\n"
                "  cipher:    %s\n",
                dev,
-               bindstr, gt_ss_port(&res.status.bind),
+               bindstr, gt_get_port((struct sockaddr *)&res.status.bind),
                res.status.mtu,
                res.status.mtu_auto ? "enabled" : "disabled",
                res.status.chacha ? "chacha20poly1305" : "aes256gcm");
     } else {
         printf("client %s:\n"
-               "  bind:      %s port %hu\n"
-               "  peer:      %s port %hu\n"
+               "  bind:      %s port %"PRIu16"\n"
+               "  peer:      %s port %"PRIu16"\n"
                "  mtu:       %zu\n"
                "  auto mtu:  %s\n"
                "  cipher:    %s\n",
                dev,
-               bindstr, gt_ss_port(&res.status.bind),
-               peerstr, gt_ss_port(&res.status.peer),
+               bindstr, gt_get_port((struct sockaddr *)&res.status.bind),
+               peerstr, gt_get_port((struct sockaddr *)&res.status.peer),
                res.status.mtu,
                res.status.mtu_auto ? "enabled" : "disabled",
                res.status.chacha ? "chacha20poly1305" : "aes256gcm");
diff --git a/src/ssutils.h b/src/ssutils.h
deleted file mode 100644
index 89056c3..0000000
--- a/src/ssutils.h
+++ /dev/null
@@ -1,31 +0,0 @@
-#pragma once
-
-#include <arpa/inet.h>
-
-static inline unsigned short
-gt_ss_port(struct sockaddr_storage *ss)
-{
-    switch (ss->ss_family) {
-    case AF_INET:
-        return ntohs(((struct sockaddr_in *)ss)->sin_port);
-    case AF_INET6:
-        return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
-    }
-
-    return 0;
-}
-
-static inline int
-gt_ss_addr(char *str, size_t size, struct sockaddr_storage *ss)
-{
-    switch (ss->ss_family) {
-    case AF_INET:
-        return -!inet_ntop(AF_INET,
-                           &((struct sockaddr_in *)ss)->sin_addr, str, size);
-    case AF_INET6:
-        return -!inet_ntop(AF_INET6,
-                           &((struct sockaddr_in6 *)ss)->sin6_addr, str, size);
-    }
-
-    return -1;
-}