build: tag function headers rather than decls as exported

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

6 files changed, 97 insertions, 63 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index dd1b1b7..82e4887 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,7 +1,5 @@
 include $(top_srcdir)/Make_global.am
-AM_CFLAGS += $(CFLAG_VISIBILITY)
-AM_CPPFLAGS += -DBUILDING_MNL
 lib_LTLIBRARIES = libmnl.la
 
 libmnl_la_LDFLAGS = -Wl,--version-script=$(srcdir)/libmnl.map -version-info $(LIBVERSION)
-libmnl_la_SOURCES = socket.c callback.c nlmsg.c attr.c
+libmnl_la_SOURCES = socket.c callback.c nlmsg.c attr.c internal.h
diff --git a/src/attr.c b/src/attr.c
index ee9678f..7357f43 100644
--- a/src/attr.c
+++ b/src/attr.c
@@ -11,6 +11,7 @@
 #include <string.h>
 #include <values.h>	/* for INT_MAX */
 #include <errno.h>
+#include "internal.h"
 
 /**
  * \defgroup attr Netlink attribute helpers
@@ -35,7 +36,7 @@
  *
  * This function returns the attribute type.
  */
-uint16_t mnl_attr_get_type(const struct nlattr *attr)
+EXPORT_SYMBOL uint16_t mnl_attr_get_type(const struct nlattr *attr)
 {
 	return attr->nla_type & NLA_TYPE_MASK;
 }
@@ -47,7 +48,7 @@ uint16_t mnl_attr_get_type(const struct nlattr *attr)
  * This function returns the attribute length that is the attribute header
  * plus the attribute payload.
  */
-uint16_t mnl_attr_get_len(const struct nlattr *attr)
+EXPORT_SYMBOL uint16_t mnl_attr_get_len(const struct nlattr *attr)
 {
 	return attr->nla_len;
 }
@@ -58,7 +59,7 @@ uint16_t mnl_attr_get_len(const struct nlattr *attr)
  *
  * This function returns the attribute payload-value length.
  */
-uint16_t mnl_attr_get_payload_len(const struct nlattr *attr)
+EXPORT_SYMBOL uint16_t mnl_attr_get_payload_len(const struct nlattr *attr)
 {
 	return attr->nla_len - MNL_ATTR_HDRLEN;
 }
@@ -69,7 +70,7 @@ uint16_t mnl_attr_get_payload_len(const struct nlattr *attr)
  *
  * This function return a pointer to the attribute payload.
  */
-void *mnl_attr_get_payload(const struct nlattr *attr)
+EXPORT_SYMBOL void *mnl_attr_get_payload(const struct nlattr *attr)
 {
 	return (void *)attr + MNL_ATTR_HDRLEN;
 }
@@ -90,7 +91,7 @@ void *mnl_attr_get_payload(const struct nlattr *attr)
  * The len parameter may be negative in the case of malformed messages during
  * attribute iteration, that is why we use a signed integer.
  */
-bool mnl_attr_ok(const struct nlattr *attr, int len)
+EXPORT_SYMBOL bool mnl_attr_ok(const struct nlattr *attr, int len)
 {
 	return len >= (int)sizeof(struct nlattr) &&
 	       attr->nla_len >= sizeof(struct nlattr) &&
@@ -106,7 +107,7 @@ bool mnl_attr_ok(const struct nlattr *attr, int len)
  * as parameter. You have to use mnl_attr_ok() to ensure that the next
  * attribute is valid.
  */
-struct nlattr *mnl_attr_next(const struct nlattr *attr)
+EXPORT_SYMBOL struct nlattr *mnl_attr_next(const struct nlattr *attr)
 {
 	return (struct nlattr *)((void *)attr + MNL_ALIGN(attr->nla_len));
 }
@@ -125,7 +126,7 @@ struct nlattr *mnl_attr_next(const struct nlattr *attr)
  * This leads to backward compatibility breakages in user-space. Better check
  * if you support an attribute, if not, skip it.
  */
-int mnl_attr_type_valid(const struct nlattr *attr, uint16_t max)
+EXPORT_SYMBOL int mnl_attr_type_valid(const struct nlattr *attr, uint16_t max)
 {
 	if (mnl_attr_get_type(attr) > max) {
 		errno = EOPNOTSUPP;
@@ -204,7 +205,8 @@ static const size_t mnl_attr_data_type_len[MNL_TYPE_MAX] = {
  * integers (u8, u16, u32 and u64) have enough room for them. This function
  * returns -1 in case of error, and errno is explicitly set.
  */
-int mnl_attr_validate(const struct nlattr *attr, enum mnl_attr_data_type type)
+EXPORT_SYMBOL int
+mnl_attr_validate(const struct nlattr *attr, enum mnl_attr_data_type type)
 {
 	int exp_len;
 
@@ -226,8 +228,9 @@ int mnl_attr_validate(const struct nlattr *attr, enum mnl_attr_data_type type)
  * whose size is variable. If the size of the attribute is not what we expect,
  * this functions returns -1 and errno is explicitly set.
  */
-int mnl_attr_validate2(const struct nlattr *attr, 
-		       enum mnl_attr_data_type type, size_t exp_len)
+EXPORT_SYMBOL int
+mnl_attr_validate2(const struct nlattr *attr, enum mnl_attr_data_type type,
+		   size_t exp_len)
 {
 	if (type >= MNL_TYPE_MAX) {
 		errno = EINVAL;
@@ -251,8 +254,9 @@ int mnl_attr_validate2(const struct nlattr *attr,
  * This function propagates the return value of the callback, which can be
  * MNL_CB_ERROR, MNL_CB_OK or MNL_CB_STOP.
  */
-int mnl_attr_parse(const struct nlmsghdr *nlh, unsigned int offset,
-		   mnl_attr_cb_t cb, void *data)
+EXPORT_SYMBOL int
+mnl_attr_parse(const struct nlmsghdr *nlh, unsigned int offset,
+	       mnl_attr_cb_t cb, void *data)
 {
 	int ret = MNL_CB_OK;
 	const struct nlattr *attr;
@@ -277,8 +281,9 @@ int mnl_attr_parse(const struct nlmsghdr *nlh, unsigned int offset,
  * This function propagates the return value of the callback, which can be
  * MNL_CB_ERROR, MNL_CB_OK or MNL_CB_STOP.
  */
-int mnl_attr_parse_nested(const struct nlattr *nested,
-			  mnl_attr_cb_t cb, void *data)
+EXPORT_SYMBOL int
+mnl_attr_parse_nested(const struct nlattr *nested, mnl_attr_cb_t cb,
+		      void *data)
 {
 	int ret = MNL_CB_OK;
 	const struct nlattr *attr;
@@ -295,7 +300,7 @@ int mnl_attr_parse_nested(const struct nlattr *nested,
  *
  * This function returns the 8-bit value of the attribute payload.
  */
-uint8_t mnl_attr_get_u8(const struct nlattr *attr)
+EXPORT_SYMBOL uint8_t mnl_attr_get_u8(const struct nlattr *attr)
 {
 	return *((uint8_t *)mnl_attr_get_payload(attr));
 }
@@ -306,7 +311,7 @@ uint8_t mnl_attr_get_u8(const struct nlattr *attr)
  *
  * This function returns the 16-bit value of the attribute payload.
  */
-uint16_t mnl_attr_get_u16(const struct nlattr *attr)
+EXPORT_SYMBOL uint16_t mnl_attr_get_u16(const struct nlattr *attr)
 {
 	return *((uint16_t *)mnl_attr_get_payload(attr));
 }
@@ -317,7 +322,7 @@ uint16_t mnl_attr_get_u16(const struct nlattr *attr)
  *
  * This function returns the 32-bit value of the attribute payload.
  */
-uint32_t mnl_attr_get_u32(const struct nlattr *attr)
+EXPORT_SYMBOL uint32_t mnl_attr_get_u32(const struct nlattr *attr)
 {
 	return *((uint32_t *)mnl_attr_get_payload(attr));
 }
@@ -330,7 +335,7 @@ uint32_t mnl_attr_get_u32(const struct nlattr *attr)
  * function is align-safe, since accessing 64-bit Netlink attributes is a
  * common source of alignment issues.
  */
-uint64_t mnl_attr_get_u64(const struct nlattr *attr)
+EXPORT_SYMBOL uint64_t mnl_attr_get_u64(const struct nlattr *attr)
 {
 	uint64_t tmp;
 	memcpy(&tmp, mnl_attr_get_payload(attr), sizeof(tmp));
@@ -343,7 +348,7 @@ uint64_t mnl_attr_get_u64(const struct nlattr *attr)
  *
  * This function returns the payload of string attribute value.
  */
-const char *mnl_attr_get_str(const struct nlattr *attr)
+EXPORT_SYMBOL const char *mnl_attr_get_str(const struct nlattr *attr)
 {
 	return mnl_attr_get_payload(attr);
 }
@@ -358,8 +363,8 @@ const char *mnl_attr_get_str(const struct nlattr *attr)
  * This function updates the length field of the Netlink message (nlmsg_len)
  * by adding the size (header + payload) of the new attribute.
  */
-void mnl_attr_put(struct nlmsghdr *nlh, uint16_t type,
-		  size_t len, const void *data)
+EXPORT_SYMBOL void
+mnl_attr_put(struct nlmsghdr *nlh, uint16_t type, size_t len, const void *data)
 {
 	struct nlattr *attr = mnl_nlmsg_get_payload_tail(nlh);
 	uint16_t payload_len = MNL_ALIGN(sizeof(struct nlattr)) + len;
@@ -380,7 +385,8 @@ void mnl_attr_put(struct nlmsghdr *nlh, uint16_t type,
  * This function updates the length field of the Netlink message (nlmsg_len)
  * by adding the size (header + payload) of the new attribute.
  */
-void mnl_attr_put_u8(struct nlmsghdr *nlh, uint16_t type, uint8_t data)
+EXPORT_SYMBOL void
+mnl_attr_put_u8(struct nlmsghdr *nlh, uint16_t type, uint8_t data)
 {
 	mnl_attr_put(nlh, type, sizeof(uint8_t), &data);
 }
@@ -394,7 +400,8 @@ void mnl_attr_put_u8(struct nlmsghdr *nlh, uint16_t type, uint8_t data)
  * This function updates the length field of the Netlink message (nlmsg_len)
  * by adding the size (header + payload) of the new attribute.
  */
-void mnl_attr_put_u16(struct nlmsghdr *nlh, uint16_t type, uint16_t data)
+EXPORT_SYMBOL void
+mnl_attr_put_u16(struct nlmsghdr *nlh, uint16_t type, uint16_t data)
 {
 	mnl_attr_put(nlh, type, sizeof(uint16_t), &data);
 }
@@ -408,7 +415,8 @@ void mnl_attr_put_u16(struct nlmsghdr *nlh, uint16_t type, uint16_t data)
  * This function updates the length field of the Netlink message (nlmsg_len)
  * by adding the size (header + payload) of the new attribute.
  */
-void mnl_attr_put_u32(struct nlmsghdr *nlh, uint16_t type, uint32_t data)
+EXPORT_SYMBOL void
+mnl_attr_put_u32(struct nlmsghdr *nlh, uint16_t type, uint32_t data)
 {
 	mnl_attr_put(nlh, type, sizeof(uint32_t), &data);
 }
@@ -422,7 +430,8 @@ void mnl_attr_put_u32(struct nlmsghdr *nlh, uint16_t type, uint32_t data)
  * This function updates the length field of the Netlink message (nlmsg_len)
  * by adding the size (header + payload) of the new attribute.
  */
-void mnl_attr_put_u64(struct nlmsghdr *nlh, uint16_t type, uint64_t data)
+EXPORT_SYMBOL void
+mnl_attr_put_u64(struct nlmsghdr *nlh, uint16_t type, uint64_t data)
 {
 	mnl_attr_put(nlh, type, sizeof(uint64_t), &data);
 }
@@ -436,7 +445,8 @@ void mnl_attr_put_u64(struct nlmsghdr *nlh, uint16_t type, uint64_t data)
  * This function updates the length field of the Netlink message (nlmsg_len)
  * by adding the size (header + payload) of the new attribute.
  */
-void mnl_attr_put_str(struct nlmsghdr *nlh, uint16_t type, const char *data)
+EXPORT_SYMBOL void
+mnl_attr_put_str(struct nlmsghdr *nlh, uint16_t type, const char *data)
 {
 	mnl_attr_put(nlh, type, strlen(data), data);
 }
@@ -453,7 +463,8 @@ void mnl_attr_put_str(struct nlmsghdr *nlh, uint16_t type, const char *data)
  * This function updates the length field of the Netlink message (nlmsg_len)
  * by adding the size (header + payload) of the new attribute.
  */
-void mnl_attr_put_strz(struct nlmsghdr *nlh, uint16_t type, const char *data)
+EXPORT_SYMBOL void
+mnl_attr_put_strz(struct nlmsghdr *nlh, uint16_t type, const char *data)
 {
 	mnl_attr_put(nlh, type, strlen(data)+1, data);
 }
@@ -467,7 +478,8 @@ void mnl_attr_put_strz(struct nlmsghdr *nlh, uint16_t type, const char *data)
  * an attribute nest. This function always returns a valid pointer to the
  * beginning of the nest.
  */
-struct nlattr *mnl_attr_nest_start(struct nlmsghdr *nlh, uint16_t type)
+EXPORT_SYMBOL struct nlattr *
+mnl_attr_nest_start(struct nlmsghdr *nlh, uint16_t type)
 {
 	struct nlattr *start = mnl_nlmsg_get_payload_tail(nlh);
 
@@ -485,7 +497,8 @@ struct nlattr *mnl_attr_nest_start(struct nlmsghdr *nlh, uint16_t type)
  *
  * This function updates the attribute header that identifies the nest.
  */
-void mnl_attr_nest_end(struct nlmsghdr *nlh, struct nlattr *start)
+EXPORT_SYMBOL void
+mnl_attr_nest_end(struct nlmsghdr *nlh, struct nlattr *start)
 {
 	start->nla_len = mnl_nlmsg_get_payload_tail(nlh) - (void *)start;
 }
diff --git a/src/callback.c b/src/callback.c
index 7bacb69..eaa5271 100644
--- a/src/callback.c
+++ b/src/callback.c
@@ -9,6 +9,7 @@
 
 #include <errno.h>
 #include <libmnl/libmnl.h>
+#include "internal.h"
 
 static int mnl_cb_noop(const struct nlmsghdr *nlh, void *data)
 {
@@ -74,9 +75,10 @@ static const mnl_cb_t default_cb_array[NLMSG_MIN_TYPE] = {
  * is set to ESRCH. If the sequence number is not the expected, errno is set
  * to EPROTO.
  */
-int mnl_cb_run2(const void *buf, size_t numbytes, unsigned int seq,
-		unsigned int portid, mnl_cb_t cb_data, void *data,
-		mnl_cb_t *cb_ctl_array, unsigned int cb_ctl_array_len)
+EXPORT_SYMBOL int
+mnl_cb_run2(const void *buf, size_t numbytes, unsigned int seq,
+	    unsigned int portid, mnl_cb_t cb_data, void *data,
+	    mnl_cb_t *cb_ctl_array, unsigned int cb_ctl_array_len)
 {
 	int ret = MNL_CB_OK, len = numbytes;
 	const struct nlmsghdr *nlh = buf;
@@ -136,8 +138,9 @@ out:
  *
  * This function propagates the callback return value.
  */
-int mnl_cb_run(const void *buf, size_t numbytes, unsigned int seq,
-	       unsigned int portid, mnl_cb_t cb_data, void *data)
+EXPORT_SYMBOL int
+mnl_cb_run(const void *buf, size_t numbytes, unsigned int seq,
+	   unsigned int portid, mnl_cb_t cb_data, void *data)
 {
 	return mnl_cb_run2(buf, numbytes, seq, portid, cb_data, data, NULL, 0);
 }
diff --git a/src/internal.h b/src/internal.h
new file mode 100644
index 0000000..ed8028f
--- /dev/null
+++ b/src/internal.h
@@ -0,0 +1,11 @@
+#ifndef INTERNAL_H
+#define INTERNAL_H 1
+
+#include "config.h"
+#ifdef HAVE_VISIBILITY_HIDDEN
+#	define EXPORT_SYMBOL __attribute__((visibility("default")))
+#else
+#	define EXPORT_SYMBOL
+#endif
+
+#endif
\ No newline at end of file
diff --git a/src/nlmsg.c b/src/nlmsg.c
index e7179c4..a0dc416 100644
--- a/src/nlmsg.c
+++ b/src/nlmsg.c
@@ -12,6 +12,7 @@
 #include <errno.h>
 #include <string.h>
 #include <libmnl/libmnl.h>
+#include "internal.h"
 
 /**
  * \defgroup nlmsg Netlink message helpers
@@ -49,7 +50,7 @@
  * This function returns the size of a netlink message (header plus payload)
  * without alignment.
  */
-size_t mnl_nlmsg_size(size_t len)
+EXPORT_SYMBOL size_t mnl_nlmsg_size(size_t len)
 {
 	return len + MNL_NLMSG_HDRLEN;
 }
@@ -73,7 +74,7 @@ size_t mnl_nlmsg_aligned_size(size_t len)
  * This function returns the Length of the netlink payload, ie. the length
  * of the full message minus the size of the Netlink header.
  */
-size_t mnl_nlmsg_get_payload_len(const struct nlmsghdr *nlh)
+EXPORT_SYMBOL size_t mnl_nlmsg_get_payload_len(const struct nlmsghdr *nlh)
 {
 	return nlh->nlmsg_len - MNL_NLMSG_HDRLEN;
 }
@@ -87,7 +88,7 @@ size_t mnl_nlmsg_get_payload_len(const struct nlmsghdr *nlh)
  * initializes the nlmsg_len field to the size of the Netlink header. This
  * function returns a pointer to the Netlink header structure.
  */
-struct nlmsghdr *mnl_nlmsg_put_header(void *buf)
+EXPORT_SYMBOL struct nlmsghdr *mnl_nlmsg_put_header(void *buf)
 {
 	int len = MNL_ALIGN(sizeof(struct nlmsghdr));
 	struct nlmsghdr *nlh = buf;
@@ -108,7 +109,8 @@ struct nlmsghdr *mnl_nlmsg_put_header(void *buf)
  * you call this function. This function returns a pointer to the extra
  * header.
  */
-void *mnl_nlmsg_put_extra_header(struct nlmsghdr *nlh, size_t size)
+EXPORT_SYMBOL void *
+mnl_nlmsg_put_extra_header(struct nlmsghdr *nlh, size_t size)
 {
 	char *ptr = (char *)nlh + nlh->nlmsg_len;
 	nlh->nlmsg_len += MNL_ALIGN(size);
@@ -122,7 +124,7 @@ void *mnl_nlmsg_put_extra_header(struct nlmsghdr *nlh, size_t size)
  *
  * This function returns a pointer to the payload of the netlink message.
  */
-void *mnl_nlmsg_get_payload(const struct nlmsghdr *nlh)
+EXPORT_SYMBOL void *mnl_nlmsg_get_payload(const struct nlmsghdr *nlh)
 {
 	return (void *)nlh + MNL_NLMSG_HDRLEN;
 }
@@ -135,7 +137,8 @@ void *mnl_nlmsg_get_payload(const struct nlmsghdr *nlh)
  * This function returns a pointer to the payload of the netlink message plus
  * a given offset.
  */
-void *mnl_nlmsg_get_payload_offset(const struct nlmsghdr *nlh, size_t offset)
+EXPORT_SYMBOL void *
+mnl_nlmsg_get_payload_offset(const struct nlmsghdr *nlh, size_t offset)
 {
 	return (void *)nlh + MNL_NLMSG_HDRLEN + MNL_ALIGN(offset);
 }
@@ -156,7 +159,7 @@ void *mnl_nlmsg_get_payload_offset(const struct nlmsghdr *nlh, size_t offset)
  * The len parameter may become negative in malformed messages during message
  * iteration, that is why we use a signed integer.
  */
-bool mnl_nlmsg_ok(const struct nlmsghdr *nlh, int len)
+EXPORT_SYMBOL bool mnl_nlmsg_ok(const struct nlmsghdr *nlh, int len)
 {
 	return len >= (int)sizeof(struct nlmsghdr) &&
 	       nlh->nlmsg_len >= sizeof(struct nlmsghdr) &&
@@ -176,7 +179,8 @@ bool mnl_nlmsg_ok(const struct nlmsghdr *nlh, int len)
  * You have to use mnl_nlmsg_ok() to check if the next Netlink message is
  * valid.
  */
-struct nlmsghdr *mnl_nlmsg_next(const struct nlmsghdr *nlh, int *len)
+EXPORT_SYMBOL struct nlmsghdr *
+mnl_nlmsg_next(const struct nlmsghdr *nlh, int *len)
 {
 	*len -= MNL_ALIGN(nlh->nlmsg_len);
 	return (struct nlmsghdr *)((void *)nlh + MNL_ALIGN(nlh->nlmsg_len));
@@ -190,7 +194,7 @@ struct nlmsghdr *mnl_nlmsg_next(const struct nlmsghdr *nlh, int *len)
  * to build a message since we continue adding attributes at the end of the
  * message.
  */
-void *mnl_nlmsg_get_payload_tail(const struct nlmsghdr *nlh)
+EXPORT_SYMBOL void *mnl_nlmsg_get_payload_tail(const struct nlmsghdr *nlh)
 {
 	return (void *)nlh + MNL_ALIGN(nlh->nlmsg_len);
 }
@@ -209,7 +213,8 @@ void *mnl_nlmsg_get_payload_tail(const struct nlmsghdr *nlh)
  * socket to send commands to kernel-space (that we want to track) and to
  * listen to events (that we do not track).
  */
-bool mnl_nlmsg_seq_ok(const struct nlmsghdr *nlh, unsigned int seq)
+EXPORT_SYMBOL bool
+mnl_nlmsg_seq_ok(const struct nlmsghdr *nlh, unsigned int seq)
 {
 	return nlh->nlmsg_seq && seq ? nlh->nlmsg_seq == seq : true;
 }
@@ -228,7 +233,8 @@ bool mnl_nlmsg_seq_ok(const struct nlmsghdr *nlh, unsigned int seq)
  * to kernel-space (that we want to track) and to listen to events (that we
  * do not track).
  */
-bool mnl_nlmsg_portid_ok(const struct nlmsghdr *nlh, unsigned int portid)
+EXPORT_SYMBOL bool
+mnl_nlmsg_portid_ok(const struct nlmsghdr *nlh, unsigned int portid)
 {
 	return nlh->nlmsg_pid && portid ? nlh->nlmsg_pid == portid : true;
 }
@@ -362,8 +368,9 @@ mnl_nlmsg_fprintf_payload(FILE *fd, const struct nlmsghdr *nlh,
  * - N, that indicates that NLA_F_NESTED is set.
  * - B, that indicates that NLA_F_NET_BYTEORDER is set.
  */
-void mnl_nlmsg_fprintf(FILE *fd, const void *data,
-		       size_t datalen, size_t extra_header_size)
+EXPORT_SYMBOL void
+mnl_nlmsg_fprintf(FILE *fd, const void *data, size_t datalen,
+		  size_t extra_header_size)
 {
 	const struct nlmsghdr *nlh = data;
 	int len = datalen;
diff --git a/src/socket.c b/src/socket.c
index 521e860..58f635e 100644
--- a/src/socket.c
+++ b/src/socket.c
@@ -14,6 +14,7 @@
 #include <unistd.h>
 #include <time.h>
 #include <errno.h>
+#include "internal.h"
 
 /**
  * \mainpage
@@ -81,7 +82,7 @@ struct mnl_socket {
  *
  * This function returns the file descriptor of a given netlink socket.
  */
-int mnl_socket_get_fd(const struct mnl_socket *nl)
+EXPORT_SYMBOL int mnl_socket_get_fd(const struct mnl_socket *nl)
 {
 	return nl->fd;
 }
@@ -95,7 +96,7 @@ int mnl_socket_get_fd(const struct mnl_socket *nl)
  * which is not always true. This is the case if you open more than one
  * socket that is binded to the same Netlink subsystem from the same process.
  */
-unsigned int mnl_socket_get_portid(const struct mnl_socket *nl)
+EXPORT_SYMBOL unsigned int mnl_socket_get_portid(const struct mnl_socket *nl)
 {
 	return nl->addr.nl_pid;
 }
@@ -107,7 +108,7 @@ unsigned int mnl_socket_get_portid(const struct mnl_socket *nl)
  * On error, it returns -1 and errno is appropriately set. Otherwise, it
  * returns a valid pointer to the mnl_socket structure.
  */
-struct mnl_socket *mnl_socket_open(int bus)
+EXPORT_SYMBOL struct mnl_socket *mnl_socket_open(int bus)
 {
 	struct mnl_socket *nl;
 
@@ -134,7 +135,8 @@ struct mnl_socket *mnl_socket_open(int bus)
  * success, 0 is returned. You can use MNL_SOCKET_AUTOPID which is 0 for
  * automatic port ID selection.
  */
-int mnl_socket_bind(struct mnl_socket *nl, unsigned int groups, pid_t pid)
+EXPORT_SYMBOL int
+mnl_socket_bind(struct mnl_socket *nl, unsigned int groups, pid_t pid)
 {
 	int ret;
 	socklen_t addr_len;
@@ -172,8 +174,8 @@ int mnl_socket_bind(struct mnl_socket *nl, unsigned int groups, pid_t pid)
  * On error, it returns -1 and errno is appropriately set. Otherwise, it 
  * returns the number of bytes sent.
  */
-ssize_t mnl_socket_sendto(const struct mnl_socket *nl, const void *buf,
-			  size_t len)
+EXPORT_SYMBOL ssize_t
+mnl_socket_sendto(const struct mnl_socket *nl, const void *buf, size_t len)
 {
 	static const struct sockaddr_nl snl = {
 		.nl_family = AF_NETLINK
@@ -196,8 +198,8 @@ ssize_t mnl_socket_sendto(const struct mnl_socket *nl, const void *buf,
  * buffer size ensures that your buffer is big enough to store the netlink
  * message without truncating it.
  */
-ssize_t mnl_socket_recvfrom(const struct mnl_socket *nl, void *buf,
-			    size_t bufsiz)
+EXPORT_SYMBOL ssize_t
+mnl_socket_recvfrom(const struct mnl_socket *nl, void *buf, size_t bufsiz)
 {
 	ssize_t ret;
 	struct sockaddr_nl addr;
@@ -236,7 +238,7 @@ ssize_t mnl_socket_recvfrom(const struct mnl_socket *nl, void *buf,
  * On error, this function returns -1 and errno is appropriately set.
  * On success, it returns 0.
  */
-int mnl_socket_close(struct mnl_socket *nl)
+EXPORT_SYMBOL int mnl_socket_close(struct mnl_socket *nl)
 {
 	int ret = close(nl->fd);
 	free(nl);
@@ -268,8 +270,8 @@ int mnl_socket_close(struct mnl_socket *nl)
  *
  * On error, this function returns -1 and errno is appropriately set.
  */
-int mnl_socket_setsockopt(const struct mnl_socket *nl, int type,
-			  void *buf, socklen_t len)
+EXPORT_SYMBOL int mnl_socket_setsockopt(const struct mnl_socket *nl, int type,
+					void *buf, socklen_t len)
 {
 	return setsockopt(nl->fd, SOL_NETLINK, type, buf, len);
 }
@@ -283,8 +285,8 @@ int mnl_socket_setsockopt(const struct mnl_socket *nl, int type,
  *
  * On error, this function returns -1 and errno is appropriately set.
  */
-int mnl_socket_getsockopt(const struct mnl_socket *nl, int type,
-			  void *buf, socklen_t *len)
+EXPORT_SYMBOL int mnl_socket_getsockopt(const struct mnl_socket *nl, int type,
+					void *buf, socklen_t *len)
 {
 	return getsockopt(nl->fd, SOL_NETLINK, type, buf, len);
 }