Specify dependencies libs explicitly.

Such setup is better for cross compilation. Also changed Makefile to
properly make the project with these libraries.

deps/libmnl/src/Makefile.am

@@ -0,0 +1,5 @@
+include $(top_srcdir)/Make_global.am
+lib_LTLIBRARIES = libmnl.la
+
+libmnl_la_LDFLAGS = -Wl,--version-script=$(srcdir)/libmnl.map -version-info $(LIBVERSION)
+libmnl_la_SOURCES = socket.c callback.c nlmsg.c attr.c internal.h libmnl.map

deps/libmnl/src/attr.c

@@ -0,0 +1,742 @@
+/*
+ * (C) 2008-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ */
+#include <limits.h>	/* for INT_MAX */
+#include <libmnl/libmnl.h>
+#include <string.h>
+#include <errno.h>
+#include "internal.h"
+
+/**
+ * \defgroup attr Netlink attribute helpers
+ *
+ * Netlink Type-Length-Value (TLV) attribute:
+ * \verbatim
+	|<-- 2 bytes -->|<-- 2 bytes -->|<-- variable -->|
+	-------------------------------------------------
+	|     length    |      type     |      value     |
+	-------------------------------------------------
+	|<--------- header ------------>|<-- payload --->|
+\endverbatim
+ * The payload of the Netlink message contains sequences of attributes that are
+ * expressed in TLV format.
+ *
+ * @{
+ */
+
+/**
+ * mnl_attr_get_type - get type of netlink attribute
+ * \param attr pointer to netlink attribute
+ *
+ * \return the attribute type
+ */
+EXPORT_SYMBOL uint16_t mnl_attr_get_type(const struct nlattr *attr)
+{
+	return attr->nla_type & NLA_TYPE_MASK;
+}
+
+/**
+ * mnl_attr_get_len - get length of netlink attribute
+ * \param attr pointer to netlink attribute
+ *
+ * \return the attribute length
+ *
+ * The attribute length is the length of the attribute header plus the
+ * attribute payload.
+ *
+ */
+EXPORT_SYMBOL uint16_t mnl_attr_get_len(const struct nlattr *attr)
+{
+	return attr->nla_len;
+}
+
+/**
+ * mnl_attr_get_payload_len - get the attribute payload-value length
+ * \param attr pointer to netlink attribute
+ *
+ * \return the attribute payload-value length
+ */
+EXPORT_SYMBOL uint16_t mnl_attr_get_payload_len(const struct nlattr *attr)
+{
+	return attr->nla_len - MNL_ATTR_HDRLEN;
+}
+
+/**
+ * mnl_attr_get_payload - get pointer to the attribute payload
+ * \param attr pointer to netlink attribute
+ *
+ * \return pointer to the attribute payload
+ */
+EXPORT_SYMBOL void *mnl_attr_get_payload(const struct nlattr *attr)
+{
+	return (void *)attr + MNL_ATTR_HDRLEN;
+}
+
+/**
+ * mnl_attr_ok - check if there is room for an attribute in a buffer
+ * \param attr attribute that we want to check if there is room for
+ * \param len remaining bytes in a buffer that contains the attribute
+ *
+ * This function is used to check that a buffer, which is supposed to contain
+ * an attribute, has enough room for the attribute that it stores, i.e. this
+ * function can be used to verify that an attribute is neither malformed nor
+ * truncated.
+ *
+ * This function does not set errno in case of error since it is intended
+ * for iterations.
+ *
+ * The len parameter may be negative in the case of malformed messages during
+ * attribute iteration, that is why we use a signed integer.
+ *
+ * \return true if there is room for the attribute, false otherwise
+ */
+EXPORT_SYMBOL bool mnl_attr_ok(const struct nlattr *attr, int len)
+{
+	return len >= (int)sizeof(struct nlattr) &&
+	       attr->nla_len >= sizeof(struct nlattr) &&
+	       (int)attr->nla_len <= len;
+}
+
+/**
+ * mnl_attr_next - get the next attribute in the payload of a netlink message
+ * \param attr pointer to the current attribute
+ *
+ * \return a pointer to the next attribute after the one passed in
+ *
+ * You have to use mnl_attr_ok() on the returned attribute to ensure that the
+ * next attribute is valid.
+ *
+ */
+EXPORT_SYMBOL struct nlattr *mnl_attr_next(const struct nlattr *attr)
+{
+	return (struct nlattr *)((void *)attr + MNL_ALIGN(attr->nla_len));
+}
+
+/**
+ * mnl_attr_type_valid - check if the attribute type is valid
+ * \param attr pointer to attribute to be checked
+ * \param max maximum attribute type
+ *
+ * This function allows one to check if the attribute type is higher than the
+ * maximum supported type.
+ *
+ * Strict attribute checking in user-space is not a good idea since you may
+ * run an old application with a newer kernel that supports new attributes.
+ * This leads to backward compatibility breakages in user-space. Better check
+ * if you support an attribute, if not, skip it.
+ *
+ * On an error, errno is explicitly set.
+ *
+ * \return 1 if the attribute is valid, -1 otherwise
+ *
+ */
+EXPORT_SYMBOL int mnl_attr_type_valid(const struct nlattr *attr, uint16_t max)
+{
+	if (mnl_attr_get_type(attr) > max) {
+		errno = EOPNOTSUPP;
+		return -1;
+	}
+	return 1;
+}
+
+static int __mnl_attr_validate(const struct nlattr *attr,
+			       enum mnl_attr_data_type type, size_t exp_len)
+{
+	uint16_t attr_len = mnl_attr_get_payload_len(attr);
+	const char *attr_data = mnl_attr_get_payload(attr);
+
+	if (attr_len < exp_len) {
+		errno = ERANGE;
+		return -1;
+	}
+	switch(type) {
+	case MNL_TYPE_FLAG:
+		if (attr_len > 0) {
+			errno = ERANGE;
+			return -1;
+		}
+		break;
+	case MNL_TYPE_NUL_STRING:
+		if (attr_len == 0) {
+			errno = ERANGE;
+			return -1;
+		}
+		if (attr_data[attr_len-1] != '\0') {
+			errno = EINVAL;
+			return -1;
+		}
+		break;
+	case MNL_TYPE_STRING:
+		if (attr_len == 0) {
+			errno = ERANGE;
+			return -1;
+		}
+		break;
+	case MNL_TYPE_NESTED:
+		/* empty nested attributes are OK. */
+		if (attr_len == 0)
+			break;
+		/* if not empty, they must contain one header, eg. flag */
+		if (attr_len < MNL_ATTR_HDRLEN) {
+			errno = ERANGE;
+			return -1;
+		}
+		break;
+	default:
+		/* make gcc happy. */
+		break;
+	}
+	if (exp_len && attr_len > exp_len) {
+		errno = ERANGE;
+		return -1;
+	}
+	return 0;
+}
+
+static const size_t mnl_attr_data_type_len[MNL_TYPE_MAX] = {
+	[MNL_TYPE_U8]		= sizeof(uint8_t),
+	[MNL_TYPE_U16]		= sizeof(uint16_t),
+	[MNL_TYPE_U32]		= sizeof(uint32_t),
+	[MNL_TYPE_U64]		= sizeof(uint64_t),
+	[MNL_TYPE_MSECS]	= sizeof(uint64_t),
+};
+
+/**
+ * mnl_attr_validate - validate netlink attribute (simplified version)
+ * \param attr pointer to netlink attribute that we want to validate
+ * \param type data type (see enum mnl_attr_data_type)
+ *
+ * The validation is based on the data type. Specifically, it checks that
+ * integers (u8, u16, u32 and u64) have enough room for them.
+ *
+ * On an error, errno is explicitly set.
+ *
+ * \return 0 on success, -1 on error
+ */
+EXPORT_SYMBOL int mnl_attr_validate(const struct nlattr *attr, enum mnl_attr_data_type type)
+{
+	int exp_len;
+
+	if (type >= MNL_TYPE_MAX) {
+		errno = EINVAL;
+		return -1;
+	}
+	exp_len = mnl_attr_data_type_len[type];
+	return __mnl_attr_validate(attr, type, exp_len);
+}
+
+/**
+ * mnl_attr_validate2 - validate netlink attribute (extended version)
+ * \param attr pointer to netlink attribute that we want to validate
+ * \param type attribute type (see enum mnl_attr_data_type)
+ * \param exp_len expected attribute data size
+ *
+ * This function allows one to perform a more accurate validation for attributes
+ * whose size is variable.
+ *
+ * On an error, errno is explicitly set.
+ *
+ * \return 0 if the attribute is valid and fits within the expected length, -1
+ * otherwise
+ */
+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;
+		return -1;
+	}
+	return __mnl_attr_validate(attr, type, exp_len);
+}
+
+/**
+ * mnl_attr_parse - parse attributes
+ * \param nlh pointer to netlink message
+ * \param offset offset to start parsing from (if payload is after any header)
+ * \param cb callback function that is called for each attribute
+ * \param data pointer to data that is passed to the callback function
+ *
+ * This function allows you to iterate over the sequence of attributes that
+ * compose the Netlink message. You can then put the attribute in an array as it
+ * usually happens at this stage or you can use any other data structure (such
+ * as lists or trees).
+ *
+ * \return propagated value from callback, one of MNL_CB_ERROR, MNL_CB_STOP
+ * or MNL_CB_OK
+ */
+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;
+
+	mnl_attr_for_each(attr, nlh, offset)
+		if ((ret = cb(attr, data)) <= MNL_CB_STOP)
+			return ret;
+	return ret;
+}
+
+/**
+ * mnl_attr_parse_nested - parse attributes inside a nest
+ * \param nested pointer to netlink attribute that contains a nest
+ * \param cb callback function that is called for each attribute in the nest
+ * \param data pointer to data passed to the callback function
+ *
+ * This function allows you to iterate over the sequence of attributes that
+ * compose the Netlink message. You can then put the attribute in an array as it
+ * usually happens at this stage or you can use any other data structure (such
+ * as lists or trees).
+ *
+* \return propagated value from callback, one of MNL_CB_ERROR, MNL_CB_STOP
+* or MNL_CB_OK
+ */
+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;
+
+	mnl_attr_for_each_nested(attr, nested)
+		if ((ret = cb(attr, data)) <= MNL_CB_STOP)
+			return ret;
+	return ret;
+}
+
+/**
+ * mnl_attr_parse_payload - parse attributes in payload of Netlink message
+ * \param payload pointer to payload of the Netlink message
+ * \param payload_len payload length that contains the attributes
+ * \param cb callback function that is called for each attribute
+ * \param data pointer to data that is passed to the callback function
+ *
+ * This function takes a pointer to the area that contains the attributes,
+ * commonly known as the payload of the Netlink message. Thus, you have to
+ * pass a pointer to the Netlink message payload, instead of the entire
+ * message.
+ *
+ * This function allows you to iterate over the sequence of attributes that are
+ * located at some payload offset. You can then put the attributes in one array
+ * as usual, or you can use any other data structure (such as lists or trees).
+ *
+ * \return propagated value from callback, one of MNL_CB_ERROR, MNL_CB_STOP
+ * or MNL_CB_OK
+ */
+EXPORT_SYMBOL int mnl_attr_parse_payload(const void *payload,
+					 size_t payload_len,
+					 mnl_attr_cb_t cb, void *data)
+{
+	int ret = MNL_CB_OK;
+	const struct nlattr *attr;
+
+	mnl_attr_for_each_payload(payload, payload_len)
+		if ((ret = cb(attr, data)) <= MNL_CB_STOP)
+			return ret;
+	return ret;
+}
+
+/**
+ * mnl_attr_get_u8 - get 8-bit unsigned integer attribute payload
+ * \param attr pointer to netlink attribute
+ *
+ * \return 8-bit value of the attribute payload
+ */
+EXPORT_SYMBOL uint8_t mnl_attr_get_u8(const struct nlattr *attr)
+{
+	return *((uint8_t *)mnl_attr_get_payload(attr));
+}
+
+/**
+ * mnl_attr_get_u16 - get 16-bit unsigned integer attribute payload
+ * \param attr pointer to netlink attribute
+ *
+ * \return 16-bit value of the attribute payload
+ */
+EXPORT_SYMBOL uint16_t mnl_attr_get_u16(const struct nlattr *attr)
+{
+	return *((uint16_t *)mnl_attr_get_payload(attr));
+}
+
+/**
+ * mnl_attr_get_u32 - get 32-bit unsigned integer attribute payload
+ * \param attr pointer to netlink attribute
+ *
+ * \return 32-bit value of the attribute payload
+ */
+EXPORT_SYMBOL uint32_t mnl_attr_get_u32(const struct nlattr *attr)
+{
+	return *((uint32_t *)mnl_attr_get_payload(attr));
+}
+
+/**
+ * mnl_attr_get_u64 - get 64-bit unsigned integer attribute
+ * \param attr pointer to netlink attribute
+ *
+ * This function reads the 64-bit nlattr payload in an alignment safe manner.
+ *
+ * \return 64-bit value of the attribute payload
+ */
+EXPORT_SYMBOL uint64_t mnl_attr_get_u64(const struct nlattr *attr)
+{
+	uint64_t tmp;
+	memcpy(&tmp, mnl_attr_get_payload(attr), sizeof(tmp));
+	return tmp;
+}
+
+/**
+ * mnl_attr_get_str - get pointer to string attribute
+ * \param attr pointer to netlink attribute
+ *
+ * \return string pointer of the attribute payload
+ */
+EXPORT_SYMBOL const char *mnl_attr_get_str(const struct nlattr *attr)
+{
+	return mnl_attr_get_payload(attr);
+}
+
+/**
+ * mnl_attr_put - add an attribute to netlink message
+ * \param nlh pointer to the netlink message
+ * \param type netlink attribute type that you want to add
+ * \param len netlink attribute payload length
+ * \param data pointer to the data that will be stored by the new attribute
+ *
+ * This function updates the length field of the Netlink message (nlmsg_len)
+ * by adding the size (header + payload) of the new attribute.
+ */
+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;
+	int pad;
+
+	attr->nla_type = type;
+	attr->nla_len = payload_len;
+	memcpy(mnl_attr_get_payload(attr), data, len);
+	pad = MNL_ALIGN(len) - len;
+	if (pad > 0)
+		memset(mnl_attr_get_payload(attr) + len, 0, pad);
+
+	nlh->nlmsg_len += MNL_ALIGN(payload_len);
+}
+
+/**
+ * mnl_attr_put_u8 - add 8-bit unsigned integer attribute to netlink message
+ * \param nlh pointer to the netlink message
+ * \param type netlink attribute type
+ * \param data 8-bit unsigned integer data that is stored by the new attribute
+ *
+ * This function updates the length field of the Netlink message (nlmsg_len)
+ * by adding the size (header + payload) of the new attribute.
+ */
+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);
+}
+
+/**
+ * mnl_attr_put_u16 - add 16-bit unsigned integer attribute to netlink message
+ * \param nlh pointer to the netlink message
+ * \param type netlink attribute type
+ * \param data 16-bit unsigned integer data that is stored by the new attribute
+ *
+ * This function updates the length field of the Netlink message (nlmsg_len)
+ * by adding the size (header + payload) of the new attribute.
+ */
+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);
+}
+
+/**
+ * mnl_attr_put_u32 - add 32-bit unsigned integer attribute to netlink message
+ * \param nlh pointer to the netlink message
+ * \param type netlink attribute type
+ * \param data 32-bit unsigned integer data that is stored by the new attribute
+ *
+ * This function updates the length field of the Netlink message (nlmsg_len)
+ * by adding the size (header + payload) of the new attribute.
+ */
+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);
+}
+
+/**
+ * mnl_attr_put_u64 - add 64-bit unsigned integer attribute to netlink message
+ * \param nlh pointer to the netlink message
+ * \param type netlink attribute type
+ * \param data 64-bit unsigned integer data that is stored by the new attribute
+ *
+ * This function updates the length field of the Netlink message (nlmsg_len)
+ * by adding the size (header + payload) of the new attribute.
+ */
+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);
+}
+
+/**
+ * mnl_attr_put_str - add string attribute to netlink message
+ * \param nlh  pointer to the netlink message
+ * \param type netlink attribute type
+ * \param data pointer to string data that is stored by the new attribute
+ *
+ * This function updates the length field of the Netlink message (nlmsg_len)
+ * by adding the size (header + payload) of the new attribute.
+ */
+EXPORT_SYMBOL void mnl_attr_put_str(struct nlmsghdr *nlh, uint16_t type,
+				    const char *data)
+{
+	mnl_attr_put(nlh, type, strlen(data), data);
+}
+
+/**
+ * mnl_attr_put_strz - add string attribute to netlink message
+ * \param nlh pointer to the netlink message
+ * \param type netlink attribute type
+ * \param data pointer to string data that is stored by the new attribute
+ *
+ * This function is similar to mnl_attr_put_str, but it includes the
+ * NUL/zero ('\0') terminator at the end of the string.
+ *
+ * This function updates the length field of the Netlink message (nlmsg_len)
+ * by adding the size (header + payload) of the new attribute.
+ */
+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);
+}
+
+/**
+ * mnl_attr_nest_start - start an attribute nest
+ * \param nlh pointer to the netlink message
+ * \param type netlink attribute type
+ *
+ * This function adds the attribute header that identifies the beginning of
+ * an attribute nest.
+ *
+ * \return valid pointer to the beginning of the nest
+ */
+EXPORT_SYMBOL struct nlattr *mnl_attr_nest_start(struct nlmsghdr *nlh,
+						 uint16_t type)
+{
+	struct nlattr *start = mnl_nlmsg_get_payload_tail(nlh);
+
+	/* set start->nla_len in mnl_attr_nest_end() */
+	start->nla_type = NLA_F_NESTED | type;
+	nlh->nlmsg_len += MNL_ALIGN(sizeof(struct nlattr));
+
+	return start;
+}
+
+/**
+ * mnl_attr_put_check - add an attribute to netlink message
+ * \param nlh pointer to the netlink message
+ * \param buflen size of buffer which stores the message
+ * \param type netlink attribute type that you want to add
+ * \param len netlink attribute payload length
+ * \param data pointer to the data that will be stored by the new attribute
+ *
+ * This function first checks that the data can be added to the message
+ * (fits into the buffer) and then updates the length field of the Netlink
+ * message (nlmsg_len) by adding the size (header + payload) of the new
+ * attribute.
+ *
+ * \return true if the attribute could be added, false otherwise
+ */
+EXPORT_SYMBOL bool mnl_attr_put_check(struct nlmsghdr *nlh, size_t buflen,
+				      uint16_t type, size_t len,
+				      const void *data)
+{
+	if (nlh->nlmsg_len + MNL_ATTR_HDRLEN + MNL_ALIGN(len) > buflen)
+		return false;
+	mnl_attr_put(nlh, type, len, data);
+	return true;
+}
+
+/**
+ * mnl_attr_put_u8_check - add 8-bit unsigned int attribute to netlink message
+ * \param nlh pointer to the netlink message
+ * \param buflen size of buffer which stores the message
+ * \param type netlink attribute type
+ * \param data 8-bit unsigned integer data that is stored by the new attribute
+ *
+ * This function first checks that the data can be added to the message
+ * (fits into the buffer) and then updates the length field of the Netlink
+ * message (nlmsg_len) by adding the size (header + payload) of the new
+ * attribute.
+ *
+ * \return true if the attribute could be added, false otherwise
+ */
+EXPORT_SYMBOL bool mnl_attr_put_u8_check(struct nlmsghdr *nlh, size_t buflen,
+					 uint16_t type, uint8_t data)
+{
+	return mnl_attr_put_check(nlh, buflen, type, sizeof(uint8_t), &data);
+}
+
+/**
+ * mnl_attr_put_u16_check - add 16-bit unsigned int attribute to netlink message
+ * \param nlh pointer to the netlink message
+ * \param buflen size of buffer which stores the message
+ * \param type netlink attribute type
+ * \param data 16-bit unsigned integer data that is stored by the new attribute
+ *
+ * This function first checks that the data can be added to the message
+ * (fits into the buffer) and then updates the length field of the Netlink
+ * message (nlmsg_len) by adding the size (header + payload) of the new
+ * attribute.
+ *
+ * \return true if the attribute could be added, false otherwise
+ */
+EXPORT_SYMBOL bool mnl_attr_put_u16_check(struct nlmsghdr *nlh, size_t buflen,
+					  uint16_t type, uint16_t data)
+{
+	return mnl_attr_put_check(nlh, buflen, type, sizeof(uint16_t), &data);
+}
+
+/**
+ * mnl_attr_put_u32_check - add 32-bit unsigned int attribute to netlink message
+ * \param nlh pointer to the netlink message
+ * \param buflen size of buffer which stores the message
+ * \param type netlink attribute type
+ * \param data 32-bit unsigned integer data that is stored by the new attribute
+ *
+ * This function first checks that the data can be added to the message
+ * (fits into the buffer) and then updates the length field of the Netlink
+ * message (nlmsg_len) by adding the size (header + payload) of the new
+ * attribute.
+ *
+ * \return true if the attribute could be added, false otherwise
+ */
+EXPORT_SYMBOL bool mnl_attr_put_u32_check(struct nlmsghdr *nlh, size_t buflen,
+					  uint16_t type, uint32_t data)
+{
+	return mnl_attr_put_check(nlh, buflen, type, sizeof(uint32_t), &data);
+}
+
+/**
+ * mnl_attr_put_u64_check - add 64-bit unsigned int attribute to netlink message
+ * \param nlh pointer to the netlink message
+ * \param buflen size of buffer which stores the message
+ * \param type netlink attribute type
+ * \param data 64-bit unsigned integer data that is stored by the new attribute
+ *
+ * This function first checks that the data can be added to the message
+ * (fits into the buffer) and then updates the length field of the Netlink
+ * message (nlmsg_len) by adding the size (header + payload) of the new
+ * attribute.
+ *
+ * \return true if the attribute could be added, false otherwise
+ */
+EXPORT_SYMBOL bool mnl_attr_put_u64_check(struct nlmsghdr *nlh, size_t buflen,
+					  uint16_t type, uint64_t data)
+{
+	return mnl_attr_put_check(nlh, buflen, type, sizeof(uint64_t), &data);
+}
+
+/**
+ * mnl_attr_put_str_check - add string attribute to netlink message
+ * \param nlh  pointer to the netlink message
+ * \param buflen size of buffer which stores the message
+ * \param type netlink attribute type
+ * \param data pointer to string data that is stored by the new attribute
+ *
+ * This function first checks that the data can be added to the message
+ * (fits into the buffer) and then updates the length field of the Netlink
+ * message (nlmsg_len) by adding the size (header + payload) of the new
+ * attribute.
+ *
+ * \return true if the attribute could be added, false otherwise
+ */
+EXPORT_SYMBOL bool mnl_attr_put_str_check(struct nlmsghdr *nlh, size_t buflen,
+					  uint16_t type, const char *data)
+{
+	return mnl_attr_put_check(nlh, buflen, type, strlen(data), data);
+}
+
+/**
+ * mnl_attr_put_strz_check - add string attribute to netlink message
+ * \param nlh pointer to the netlink message
+ * \param buflen size of buffer which stores the message
+ * \param type netlink attribute type
+ * \param data pointer to string data that is stored by the new attribute
+ *
+ * This function is similar to mnl_attr_put_str, but it includes the
+ * NUL/zero ('\0') terminator at the end of the string.
+ *
+ * This function first checks that the data can be added to the message
+ * (fits into the buffer) and then updates the length field of the Netlink
+ * message (nlmsg_len) by adding the size (header + payload) of the new
+ * attribute.
+ *
+ * \return true if the attribute could be added, false otherwise
+ */
+EXPORT_SYMBOL bool mnl_attr_put_strz_check(struct nlmsghdr *nlh, size_t buflen,
+					   uint16_t type, const char *data)
+{
+	return mnl_attr_put_check(nlh, buflen, type, strlen(data)+1, data);
+}
+
+/**
+ * mnl_attr_nest_start_check - start an attribute nest
+ * \param buflen size of buffer which stores the message
+ * \param nlh pointer to the netlink message
+ * \param type netlink attribute type
+ *
+ * This function adds the attribute header that identifies the beginning of
+ * an attribute nest.
+ *
+ * \return NULL if the attribute cannot be added, otherwise a pointer to the
+ * beginning of the nest
+ */
+EXPORT_SYMBOL struct nlattr *mnl_attr_nest_start_check(struct nlmsghdr *nlh,
+						       size_t buflen,
+						       uint16_t type)
+{
+	if (nlh->nlmsg_len + MNL_ATTR_HDRLEN > buflen)
+		return NULL;
+	return mnl_attr_nest_start(nlh, type);
+}
+
+/**
+ * mnl_attr_nest_end - end an attribute nest
+ * \param nlh pointer to the netlink message
+ * \param start pointer to the attribute nest returned by mnl_attr_nest_start()
+ *
+ * This function updates the attribute header that identifies the nest.
+ */
+EXPORT_SYMBOL void mnl_attr_nest_end(struct nlmsghdr *nlh,
+				     struct nlattr *start)
+{
+	start->nla_len = mnl_nlmsg_get_payload_tail(nlh) - (void *)start;
+}
+
+/**
+ * mnl_attr_nest_cancel - cancel an attribute nest
+ * \param nlh pointer to the netlink message
+ * \param start pointer to the attribute nest returned by mnl_attr_nest_start()
+ *
+ * This function updates the attribute header that identifies the nest.
+ */
+EXPORT_SYMBOL void mnl_attr_nest_cancel(struct nlmsghdr *nlh,
+					struct nlattr *start)
+{
+	nlh->nlmsg_len -= mnl_nlmsg_get_payload_tail(nlh) - (void *)start;
+}
+
+/**
+ * @}
+ */

deps/libmnl/src/callback.c

@@ -0,0 +1,167 @@
+/*
+ * (C) 2008-2010 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <errno.h>
+#include <libmnl/libmnl.h>
+#include "internal.h"
+
+static int mnl_cb_noop(const struct nlmsghdr *nlh, void *data)
+{
+	return MNL_CB_OK;
+}
+
+static int mnl_cb_error(const struct nlmsghdr *nlh, void *data)
+{
+	const struct nlmsgerr *err = mnl_nlmsg_get_payload(nlh);
+
+	if (nlh->nlmsg_len < mnl_nlmsg_size(sizeof(struct nlmsgerr))) {
+		errno = EBADMSG; 
+		return MNL_CB_ERROR;
+	}
+	/* Netlink subsystems returns the errno value with different signess */
+	if (err->error < 0)
+		errno = -err->error;
+	else
+		errno = err->error;
+
+	return err->error == 0 ? MNL_CB_STOP : MNL_CB_ERROR;
+}
+
+static int mnl_cb_stop(const struct nlmsghdr *nlh, void *data)
+{
+	return MNL_CB_STOP;
+}
+
+static const mnl_cb_t default_cb_array[NLMSG_MIN_TYPE] = {
+	[NLMSG_NOOP]	= mnl_cb_noop,
+	[NLMSG_ERROR]	= mnl_cb_error,
+	[NLMSG_DONE]	= mnl_cb_stop,
+	[NLMSG_OVERRUN]	= mnl_cb_noop,
+};
+
+static inline int __mnl_cb_run(const void *buf, size_t numbytes,
+			       unsigned int seq, unsigned int portid,
+			       mnl_cb_t cb_data, void *data,
+			       const mnl_cb_t *cb_ctl_array,
+			       unsigned int cb_ctl_array_len)
+{
+	int ret = MNL_CB_OK, len = numbytes;
+	const struct nlmsghdr *nlh = buf;
+
+	while (mnl_nlmsg_ok(nlh, len)) {
+		/* check message source */
+		if (!mnl_nlmsg_portid_ok(nlh, portid)) {
+			errno = ESRCH;
+			return -1;
+		}
+		/* perform sequence tracking */
+		if (!mnl_nlmsg_seq_ok(nlh, seq)) {
+			errno = EPROTO;
+			return -1;
+		}
+
+		/* dump was interrupted */
+		if (nlh->nlmsg_flags & NLM_F_DUMP_INTR) {
+			errno = EINTR;
+			return -1;
+		}
+
+		/* netlink data message handling */
+		if (nlh->nlmsg_type >= NLMSG_MIN_TYPE) { 
+			if (cb_data){
+				ret = cb_data(nlh, data);
+				if (ret <= MNL_CB_STOP)
+					goto out;
+			}
+		} else if (nlh->nlmsg_type < cb_ctl_array_len) {
+			if (cb_ctl_array && cb_ctl_array[nlh->nlmsg_type]) {
+				ret = cb_ctl_array[nlh->nlmsg_type](nlh, data);
+				if (ret <= MNL_CB_STOP)
+					goto out;
+			}
+		} else if (default_cb_array[nlh->nlmsg_type]) {
+			ret = default_cb_array[nlh->nlmsg_type](nlh, data);
+			if (ret <= MNL_CB_STOP)
+				goto out;
+		}
+		nlh = mnl_nlmsg_next(nlh, &len);
+	}
+out:
+	return ret;
+}
+
+/**
+ * \defgroup callback Callback helpers
+ * @{
+ */
+
+/**
+ * mnl_cb_run2 - callback runqueue for netlink messages
+ * \param buf buffer that contains the netlink messages
+ * \param numbytes number of bytes stored in the buffer
+ * \param seq sequence number that we expect to receive
+ * \param portid Netlink PortID that we expect to receive
+ * \param cb_data callback handler for data messages
+ * \param data pointer to data that will be passed to the data callback handler
+ * \param cb_ctl_array array of custom callback handlers from control messages
+ * \param cb_ctl_array_len array length of custom control callback handlers
+ *
+ * You can set the cb_ctl_array to NULL if you want to use the default control
+ * callback handlers, in that case, the parameter cb_ctl_array_len is not
+ * checked.
+ *
+ * Your callback may return three possible values:
+ * 	- MNL_CB_ERROR (<=-1): an error has occurred. Stop callback runqueue.
+ * 	- MNL_CB_STOP (=0): stop callback runqueue.
+ * 	- MNL_CB_OK (>=1): no problem has occurred.
+ *
+ * This function propagates the callback return value. On error, it returns
+ * -1 and errno is explicitly set. If the portID is not the expected, errno
+ * is set to ESRCH. If the sequence number is not the expected, errno is set
+ * to EPROTO. If the dump was interrupted, errno is set to EINTR and you should
+ * request a new fresh dump again.
+ */
+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,
+			      const mnl_cb_t *cb_ctl_array,
+			      unsigned int cb_ctl_array_len)
+{
+	return __mnl_cb_run(buf, numbytes, seq, portid, cb_data, data,
+			    cb_ctl_array, cb_ctl_array_len);
+}
+
+/**
+ * mnl_cb_run - callback runqueue for netlink messages (simplified version)
+ * \param buf buffer that contains the netlink messages
+ * \param numbytes number of bytes stored in the buffer
+ * \param seq sequence number that we expect to receive
+ * \param portid Netlink PortID that we expect to receive
+ * \param cb_data callback handler for data messages
+ * \param data pointer to data that will be passed to the data callback handler
+ *
+ * This function is like mnl_cb_run2() but it does not allow you to set
+ * the control callback handlers.
+ *
+ * Your callback may return three possible values:
+ * 	- MNL_CB_ERROR (<=-1): an error has occurred. Stop callback runqueue.
+ * 	- MNL_CB_STOP (=0): stop callback runqueue.
+ * 	- MNL_CB_OK (>=1): no problems has occurred.
+ *
+ * This function propagates the callback return value.
+ */
+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_run(buf, numbytes, seq, portid, cb_data, data, NULL, 0);
+}
+
+/**
+ * @}
+ */

deps/libmnl/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

deps/libmnl/src/libmnl.map

@@ -0,0 +1,79 @@
+LIBMNL_1.0 {
+global:
+  mnl_attr_get_len;
+  mnl_attr_get_payload;
+  mnl_attr_get_payload_len;
+  mnl_attr_get_str;
+  mnl_attr_get_type;
+  mnl_attr_get_u16;
+  mnl_attr_get_u32;
+  mnl_attr_get_u64;
+  mnl_attr_get_u8;
+  mnl_attr_nest_end;
+  mnl_attr_nest_start;
+  mnl_attr_nest_start_check;
+  mnl_attr_nest_cancel;
+  mnl_attr_next;
+  mnl_attr_ok;
+  mnl_attr_parse;
+  mnl_attr_parse_nested;
+  mnl_attr_put;
+  mnl_attr_put_str;
+  mnl_attr_put_strz;
+  mnl_attr_put_u16;
+  mnl_attr_put_u32;
+  mnl_attr_put_u64;
+  mnl_attr_put_u8;
+  mnl_attr_put_check;
+  mnl_attr_put_str_check;
+  mnl_attr_put_strz_check;
+  mnl_attr_put_u16_check;
+  mnl_attr_put_u32_check;
+  mnl_attr_put_u64_check;
+  mnl_attr_put_u8_check;
+  mnl_attr_type_valid;
+  mnl_attr_validate;
+  mnl_attr_validate2;
+  mnl_cb_run;
+  mnl_cb_run2;
+  mnl_nlmsg_fprintf;
+  mnl_nlmsg_get_payload;
+  mnl_nlmsg_get_payload_len;
+  mnl_nlmsg_get_payload_offset;
+  mnl_nlmsg_get_payload_tail;
+  mnl_nlmsg_next;
+  mnl_nlmsg_ok;
+  mnl_nlmsg_portid_ok;
+  mnl_nlmsg_put_extra_header;
+  mnl_nlmsg_put_header;
+  mnl_nlmsg_seq_ok;
+  mnl_nlmsg_size;
+  mnl_nlmsg_batch_start;
+  mnl_nlmsg_batch_stop;
+  mnl_nlmsg_batch_next;
+  mnl_nlmsg_batch_size;
+  mnl_nlmsg_batch_reset;
+  mnl_nlmsg_batch_current;
+  mnl_nlmsg_batch_head;
+  mnl_nlmsg_batch_is_empty;
+  mnl_socket_bind;
+  mnl_socket_close;
+  mnl_socket_get_fd;
+  mnl_socket_get_portid;
+  mnl_socket_getsockopt;
+  mnl_socket_open;
+  mnl_socket_recvfrom;
+  mnl_socket_sendto;
+  mnl_socket_setsockopt;
+
+local: *;
+};
+
+LIBMNL_1.1 {
+  mnl_attr_parse_payload;
+} LIBMNL_1.0;
+
+LIBMNL_1.2 {
+  mnl_socket_open2;
+  mnl_socket_fdopen;
+} LIBMNL_1.1;

deps/libmnl/src/nlmsg.c

@@ -0,0 +1,592 @@
+/*
+ * (C) 2008-2010 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ */
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <libmnl/libmnl.h>
+#include "internal.h"
+
+/**
+ * \defgroup nlmsg Netlink message helpers
+ *
+ * Netlink message:
+ * \verbatim
+	|<----------------- 4 bytes ------------------->|
+	|<----- 2 bytes ------>|<------- 2 bytes ------>|
+	|-----------------------------------------------|
+	|      Message length (including header)        |
+	|-----------------------------------------------|
+	|     Message type     |     Message flags      |
+	|-----------------------------------------------|
+	|           Message sequence number             |
+	|-----------------------------------------------|
+	|                 Netlink PortID                |
+	|-----------------------------------------------|
+	|                                               |
+	.                   Payload                     .
+	|_______________________________________________|
+\endverbatim
+ *
+ * There is usually an extra header after the the Netlink header (at the
+ * beginning of the payload). This extra header is specific of the Netlink
+ * subsystem. After this extra header, it comes the sequence of attributes
+ * that are expressed in Type-Length-Value (TLV) format.
+ *
+ * @{
+ */
+
+/**
+ * mnl_nlmsg_size - calculate the size of Netlink message (without alignment)
+ * \param len length of the Netlink payload
+ *
+ * This function returns the size of a netlink message (header plus payload)
+ * without alignment.
+ */
+EXPORT_SYMBOL size_t mnl_nlmsg_size(size_t len)
+{
+	return len + MNL_NLMSG_HDRLEN;
+}
+
+/**
+ * mnl_nlmsg_get_payload_len - get the length of the Netlink payload
+ * \param nlh pointer to the header of the Netlink message
+ *
+ * This function returns the Length of the netlink payload, ie. the length
+ * of the full message minus the size of the Netlink header.
+ */
+EXPORT_SYMBOL size_t mnl_nlmsg_get_payload_len(const struct nlmsghdr *nlh)
+{
+	return nlh->nlmsg_len - MNL_NLMSG_HDRLEN;
+}
+
+/**
+ * mnl_nlmsg_put_header - reserve and prepare room for Netlink header
+ * \param buf memory already allocated to store the Netlink header
+ *
+ * This function sets to zero the room that is required to put the Netlink
+ * header in the memory buffer passed as parameter. This function also
+ * initializes the nlmsg_len field to the size of the Netlink header. This
+ * function returns a pointer to the Netlink header structure.
+ */
+EXPORT_SYMBOL struct nlmsghdr *mnl_nlmsg_put_header(void *buf)
+{
+	int len = MNL_ALIGN(sizeof(struct nlmsghdr));
+	struct nlmsghdr *nlh = buf;
+
+	memset(buf, 0, len);
+	nlh->nlmsg_len = len;
+	return nlh;
+}
+
+/**
+ * mnl_nlmsg_put_extra_header - reserve and prepare room for an extra header
+ * \param nlh pointer to Netlink header
+ * \param size size of the extra header that we want to put
+ *
+ * This function sets to zero the room that is required to put the extra
+ * header after the initial Netlink header. This function also increases
+ * the nlmsg_len field. You have to invoke mnl_nlmsg_put_header() before
+ * you call this function. This function returns a pointer to the extra
+ * header.
+ */
+EXPORT_SYMBOL void *mnl_nlmsg_put_extra_header(struct nlmsghdr *nlh,
+					       size_t size)
+{
+	char *ptr = (char *)nlh + nlh->nlmsg_len;
+	size_t len = MNL_ALIGN(size);
+	nlh->nlmsg_len += len;
+	memset(ptr, 0, len);
+	return ptr;
+}
+
+/**
+ * mnl_nlmsg_get_payload - get a pointer to the payload of the netlink message
+ * \param nlh pointer to a netlink header
+ *
+ * This function returns a pointer to the payload of the netlink message.
+ */
+EXPORT_SYMBOL void *mnl_nlmsg_get_payload(const struct nlmsghdr *nlh)
+{
+	return (void *)nlh + MNL_NLMSG_HDRLEN;
+}
+
+/**
+ * mnl_nlmsg_get_payload_offset - get a pointer to the payload of the message
+ * \param nlh pointer to a netlink header
+ * \param offset offset to the payload of the attributes TLV set
+ *
+ * This function returns a pointer to the payload of the netlink message plus
+ * a given 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);
+}
+
+/**
+ * mnl_nlmsg_ok - check a there is room for netlink message
+ * \param nlh netlink message that we want to check
+ * \param len remaining bytes in a buffer that contains the netlink message
+ *
+ * This function is used to check that a buffer that contains a netlink
+ * message has enough room for the netlink message that it stores, ie. this
+ * function can be used to verify that a netlink message is not malformed nor
+ * truncated.
+ *
+ * This function does not set errno in case of error since it is intended
+ * for iterations. Thus, it returns true on success and false on error.
+ *
+ * The len parameter may become negative in malformed messages during message
+ * iteration, that is why we use a signed integer.
+ */
+EXPORT_SYMBOL bool mnl_nlmsg_ok(const struct nlmsghdr *nlh, int len)
+{
+	size_t ulen = len;
+
+	if (len < 0)
+		return false;
+
+	return ulen           >= sizeof(struct nlmsghdr) &&
+	       nlh->nlmsg_len >= sizeof(struct nlmsghdr) &&
+	       nlh->nlmsg_len <= ulen;
+}
+
+/**
+ * mnl_nlmsg_next - get the next netlink message in a multipart message
+ * \param nlh current netlink message that we are handling
+ * \param len length of the remaining bytes in the buffer (passed by reference).
+ *
+ * This function returns a pointer to the next netlink message that is part
+ * of a multi-part netlink message. Netlink can batch several messages into
+ * one buffer so that the receiver has to iterate over the whole set of
+ * Netlink messages.
+ *
+ * You have to use mnl_nlmsg_ok() to check if the next Netlink message is
+ * valid.
+ */
+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));
+}
+
+/**
+ * mnl_nlmsg_get_payload_tail - get the ending of the netlink message
+ * \param nlh pointer to netlink message
+ *
+ * This function returns a pointer to the netlink message tail. This is useful
+ * to build a message since we continue adding attributes at the end of the
+ * message.
+ */
+EXPORT_SYMBOL void *mnl_nlmsg_get_payload_tail(const struct nlmsghdr *nlh)
+{
+	return (void *)nlh + MNL_ALIGN(nlh->nlmsg_len);
+}
+
+/**
+ * mnl_nlmsg_seq_ok - perform sequence tracking
+ * \param nlh current netlink message that we are handling
+ * \param seq last sequence number used to send a message
+ *
+ * This functions returns true if the sequence tracking is fulfilled, otherwise
+ * false is returned. We skip the tracking for netlink messages whose sequence
+ * number is zero since it is usually reserved for event-based kernel
+ * notifications. On the other hand, if seq is set but the message sequence
+ * number is not set (i.e. this is an event message coming from kernel-space),
+ * then we also skip the tracking. This approach is good if we use the same
+ * socket to send commands to kernel-space (that we want to track) and to
+ * listen to events (that we do not track).
+ */
+EXPORT_SYMBOL bool mnl_nlmsg_seq_ok(const struct nlmsghdr *nlh,
+				    unsigned int seq)
+{
+	return nlh->nlmsg_seq && seq ? nlh->nlmsg_seq == seq : true;
+}
+
+/**
+ * mnl_nlmsg_portid_ok - perform portID origin check
+ * \param nlh current netlink message that we are handling
+ * \param portid netlink portid that we want to check
+ *
+ * This functions returns true if the origin is fulfilled, otherwise
+ * false is returned. We skip the tracking for netlink message whose portID
+ * is zero since it is reserved for event-based kernel notifications. On the
+ * other hand, if portid is set but the message PortID is not (i.e. this
+ * is an event message coming from kernel-space), then we also skip the
+ * tracking. This approach is good if we use the same socket to send commands
+ * to kernel-space (that we want to track) and to listen to events (that we
+ * do not track).
+ */
+EXPORT_SYMBOL bool mnl_nlmsg_portid_ok(const struct nlmsghdr *nlh,
+				       unsigned int portid)
+{
+	return nlh->nlmsg_pid && portid ? nlh->nlmsg_pid == portid : true;
+}
+
+static void mnl_nlmsg_fprintf_header(FILE *fd, const struct nlmsghdr *nlh)
+{
+	fprintf(fd, "----------------\t------------------\n");
+	fprintf(fd, "|  %.010u  |\t| message length |\n", nlh->nlmsg_len);
+	fprintf(fd, "| %.05u | %c%c%c%c |\t|  type | flags  |\n",
+		nlh->nlmsg_type,
+		nlh->nlmsg_flags & NLM_F_REQUEST ? 'R' : '-',
+		nlh->nlmsg_flags & NLM_F_MULTI ? 'M' : '-',
+		nlh->nlmsg_flags & NLM_F_ACK ? 'A' : '-',
+		nlh->nlmsg_flags & NLM_F_ECHO ? 'E' : '-');
+	fprintf(fd, "|  %.010u  |\t| sequence number|\n", nlh->nlmsg_seq);
+	fprintf(fd, "|  %.010u  |\t|     port ID    |\n", nlh->nlmsg_pid);
+	fprintf(fd, "----------------\t------------------\n");
+}
+
+static void mnl_fprintf_attr_color(FILE *fd, const struct nlattr *attr)
+{
+	fprintf(fd, "|%c[%d;%dm"
+		    "%.5u"
+		    "%c[%dm"
+		    "|"
+		    "%c[%d;%dm"
+		    "%c%c"
+		    "%c[%dm"
+		    "|"
+		    "%c[%d;%dm"
+		    "%.5u"
+		    "%c[%dm|\t",
+		    27, 1, 31,
+		    attr->nla_len,
+		    27, 0,
+		    27, 1, 32,
+		    attr->nla_type & NLA_F_NESTED ? 'N' : '-',
+		    attr->nla_type & NLA_F_NET_BYTEORDER ? 'B' : '-',
+		    27, 0,
+		    27, 1, 34,
+		    attr->nla_type & NLA_TYPE_MASK,
+		    27, 0);
+}
+
+static void mnl_fprintf_attr_raw(FILE *fd, const struct nlattr *attr)
+{
+	fprintf(fd, "|"
+		    "%.5u"
+		    "|"
+		    "%c%c"
+		    "|"
+		    "%.5u"
+		    "|\t",
+		    attr->nla_len,
+		    attr->nla_type & NLA_F_NESTED ? 'N' : '-',
+		    attr->nla_type & NLA_F_NET_BYTEORDER ? 'B' : '-',
+		    attr->nla_type & NLA_TYPE_MASK);
+}
+
+static void mnl_nlmsg_fprintf_payload(FILE *fd, const struct nlmsghdr *nlh,
+				      size_t extra_header_size)
+{
+	int colorize = 0;
+	unsigned int i;
+	int rem = 0;
+	int fdnum;
+
+	fdnum = fileno(fd);
+	if (fdnum != -1)
+		colorize = isatty(fdnum);
+
+	for (i=sizeof(struct nlmsghdr); i<nlh->nlmsg_len; i+=4) {
+		char *b = (char *) nlh;
+		struct nlattr *attr = (struct nlattr *) (b+i);
+
+		/* netlink control message. */
+		if (nlh->nlmsg_type < NLMSG_MIN_TYPE) {
+			fprintf(fd, "| %.2x %.2x %.2x %.2x  |\t",
+				0xff & b[i],	0xff & b[i+1],
+				0xff & b[i+2],	0xff & b[i+3]);
+			fprintf(fd, "|                |\n");
+		/* special handling for the extra header. */
+		} else if (extra_header_size > 0) {
+			extra_header_size -= 4;
+			fprintf(fd, "| %.2x %.2x %.2x %.2x  |\t",
+				0xff & b[i],	0xff & b[i+1],
+				0xff & b[i+2],	0xff & b[i+3]);
+			fprintf(fd, "|  extra header  |\n");
+		/* this seems like an attribute header. */
+		} else if (rem == 0 && (attr->nla_type & NLA_TYPE_MASK) != 0) {
+			if (colorize) {
+				mnl_fprintf_attr_color(fd, attr);
+			} else {
+				mnl_fprintf_attr_raw(fd, attr);
+			}
+			fprintf(fd, "|len |flags| type|\n");
+
+			if (!(attr->nla_type & NLA_F_NESTED)) {
+				rem = NLA_ALIGN(attr->nla_len) -
+					sizeof(struct nlattr);
+			}
+		/* this is the attribute payload. */
+		} else if (rem > 0) {
+			rem -= 4;
+			fprintf(fd, "| %.2x %.2x %.2x %.2x  |\t",
+				0xff & b[i],	0xff & b[i+1],
+				0xff & b[i+2],	0xff & b[i+3]);
+			fprintf(fd, "|      data      |");
+			fprintf(fd, "\t %c %c %c %c\n",
+				isprint(b[i]) ? b[i] : ' ',
+				isprint(b[i+1]) ? b[i+1] : ' ',
+				isprint(b[i+2]) ? b[i+2] : ' ',
+				isprint(b[i+3]) ? b[i+3] : ' ');
+		}
+	}
+	fprintf(fd, "----------------\t------------------\n");
+}
+
+/**
+ * mnl_nlmsg_fprintf - print netlink message to file
+ * \param fd pointer to file type
+ * \param data pointer to the buffer that contains messages to be printed
+ * \param datalen length of data stored in the buffer
+ * \param extra_header_size size of the extra header (if any)
+ *
+ * This function prints the netlink header to a file handle.
+ * It may be useful for debugging purposes. One example of the output
+ * is the following:
+ *
+ *\verbatim
+----------------        ------------------
+|  0000000040  |        | message length |
+| 00016 | R-A- |        |  type | flags  |
+|  1289148991  |        | sequence number|
+|  0000000000  |        |     port ID    |
+----------------        ------------------
+| 00 00 00 00  |        |  extra header  |
+| 00 00 00 00  |        |  extra header  |
+| 01 00 00 00  |        |  extra header  |
+| 01 00 00 00  |        |  extra header  |
+|00008|--|00003|        |len |flags| type|
+| 65 74 68 30  |        |      data      |       e t h 0
+----------------        ------------------
+\endverbatim
+ *
+ * This example above shows the netlink message that is send to kernel-space
+ * to set up the link interface eth0. The netlink and attribute header data
+ * are displayed in base 10 whereas the extra header and the attribute payload
+ * are expressed in base 16. The possible flags in the netlink header are:
+ *
+ * - R, that indicates that NLM_F_REQUEST is set.
+ * - M, that indicates that NLM_F_MULTI is set.
+ * - A, that indicates that NLM_F_ACK is set.
+ * - E, that indicates that NLM_F_ECHO is set.
+ *
+ * The lack of one flag is displayed with '-'. On the other hand, the possible
+ * attribute flags available are:
+ *
+ * - N, that indicates that NLA_F_NESTED is set.
+ * - B, that indicates that NLA_F_NET_BYTEORDER is set.
+ */
+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;
+
+	while (mnl_nlmsg_ok(nlh, len)) {
+		mnl_nlmsg_fprintf_header(fd, nlh);
+		mnl_nlmsg_fprintf_payload(fd, nlh, extra_header_size);
+		nlh = mnl_nlmsg_next(nlh, &len);
+	}
+}
+
+/**
+ * @}
+ */
+
+/**
+ * \defgroup batch Netlink message batch helpers
+ *
+ * This library provides helpers to batch several messages into one single
+ * datagram. These helpers do not perform strict memory boundary checkings.
+ *
+ * The following figure represents a Netlink message batch:
+ *\verbatim
+   |<-------------- MNL_SOCKET_BUFFER_SIZE ------------->|
+   |<-------------------- batch ------------------>|     |
+   |-----------|-----------|-----------|-----------|-----------|
+   |<- nlmsg ->|<- nlmsg ->|<- nlmsg ->|<- nlmsg ->|<- nlmsg ->|
+   |-----------|-----------|-----------|-----------|-----------|
+					     ^           ^
+					     |           |
+					message N   message N+1
+\endverbatim
+ *
+ * To start the batch, you have to call mnl_nlmsg_batch_start() and you can
+ * use mnl_nlmsg_batch_stop() to release it.
+ *
+ * You have to invoke mnl_nlmsg_batch_next() to get room for a new message
+ * in the batch. If this function returns NULL, it means that the last
+ * message that was added (message N+1 in the figure above) does not fit the
+ * batch. Thus, you have to send the batch (which includes until message N)
+ * and, then, you have to call mnl_nlmsg_batch_reset() to re-initialize
+ * the batch (this moves message N+1 to the head of the buffer). For that
+ * reason, the buffer that you have to use to store the batch must be double
+ * of MNL_SOCKET_BUFFER_SIZE to ensure that the last message (message N+1)
+ * that did not fit into the batch is written inside valid memory boundaries.
+ *
+ * @{
+ */
+
+struct mnl_nlmsg_batch {
+	/* the buffer that is used to store the batch. */
+	void *buf;
+	size_t limit;
+	size_t buflen;
+	/* the current netlink message in the batch. */
+	void *cur;
+	bool overflow;
+};
+
+/**
+ * mnl_nlmsg_batch_start - initialize a batch
+ * \param buf pointer to the buffer that will store this batch
+ * \param limit maximum size of the batch (should be MNL_SOCKET_BUFFER_SIZE).
+ *
+ * The buffer that you pass must be double of MNL_SOCKET_BUFFER_SIZE. The
+ * limit must be half of the buffer size, otherwise expect funny memory
+ * corruptions 8-).
+ *
+ * You can allocate the buffer that you use to store the batch in the stack or
+ * the heap, no restrictions in this regard. This function returns NULL on
+ * error.
+ */
+EXPORT_SYMBOL struct mnl_nlmsg_batch *mnl_nlmsg_batch_start(void *buf,
+							    size_t limit)
+{
+	struct mnl_nlmsg_batch *b;
+
+	b = malloc(sizeof(struct mnl_nlmsg_batch));
+	if (b == NULL)
+		return NULL;
+
+	b->buf = buf;
+	b->limit = limit;
+	b->buflen = 0;
+	b->cur = buf;
+	b->overflow = false;
+
+	return b;
+}
+
+/**
+ * mnl_nlmsg_batch_stop - release a batch
+ * \param b pointer to batch
+ *
+ * This function releases the batch allocated by mnl_nlmsg_batch_start().
+ */
+EXPORT_SYMBOL void mnl_nlmsg_batch_stop(struct mnl_nlmsg_batch *b)
+{
+	free(b);
+}
+
+/**
+ * mnl_nlmsg_batch_next - get room for the next message in the batch
+ * \param b pointer to batch
+ *
+ * This function returns false if the last message did not fit into the
+ * batch. Otherwise, it prepares the batch to provide room for the new
+ * Netlink message in the batch and returns true.
+ *
+ * You have to put at least one message in the batch before calling this
+ * function, otherwise your application is likely to crash.
+ */
+EXPORT_SYMBOL bool mnl_nlmsg_batch_next(struct mnl_nlmsg_batch *b)
+{
+	struct nlmsghdr *nlh = b->cur;
+
+	if (b->buflen + nlh->nlmsg_len > b->limit) {
+		b->overflow = true;
+		return false;
+	}
+	b->cur = b->buf + b->buflen + nlh->nlmsg_len;
+	b->buflen += nlh->nlmsg_len;
+	return true;
+}
+
+/**
+ * mnl_nlmsg_batch_reset - reset the batch
+ * \param b pointer to batch
+ *
+ * This function allows you to reset a batch, so you can reuse it to create a
+ * new one. This function moves the last message which does not fit the batch to
+ * the head of the buffer, if any.
+ */
+EXPORT_SYMBOL void mnl_nlmsg_batch_reset(struct mnl_nlmsg_batch *b)
+{
+	if (b->overflow) {
+		struct nlmsghdr *nlh = b->cur;
+		memcpy(b->buf, b->cur, nlh->nlmsg_len);
+		b->buflen = nlh->nlmsg_len;
+		b->cur = b->buf + b->buflen;
+		b->overflow = false;
+	} else {
+		b->buflen = 0;
+		b->cur = b->buf;
+	}
+}
+
+/**
+ * mnl_nlmsg_batch_size - get current size of the batch
+ * \param b pointer to batch
+ *
+ * This function returns the current size of the batch.
+ */
+EXPORT_SYMBOL size_t mnl_nlmsg_batch_size(struct mnl_nlmsg_batch *b)
+{
+	return b->buflen;
+}
+
+/**
+ * mnl_nlmsg_batch_head - get head of this batch
+ * \param b pointer to batch
+ *
+ * This function returns a pointer to the head of the batch, which is the
+ * beginning of the buffer that is used.
+ */
+EXPORT_SYMBOL void *mnl_nlmsg_batch_head(struct mnl_nlmsg_batch *b)
+{
+	return b->buf;
+}
+
+/**
+ * mnl_nlmsg_batch_current - returns current position in the batch
+ * \param b pointer to batch
+ *
+ * This function returns a pointer to the current position in the buffer
+ * that is used to store the batch.
+ */
+EXPORT_SYMBOL void *mnl_nlmsg_batch_current(struct mnl_nlmsg_batch *b)
+{
+	return b->cur;
+}
+
+/**
+ * mnl_nlmsg_batch_is_empty - check if there is any message in the batch
+ * \param b pointer to batch
+ *
+ * This function returns true if the batch is empty.
+ */
+EXPORT_SYMBOL bool mnl_nlmsg_batch_is_empty(struct mnl_nlmsg_batch *b)
+{
+	return b->buflen == 0;
+}
+
+/**
+ * @}
+ */

deps/libmnl/src/socket.c

@@ -0,0 +1,351 @@
+/*
+ * (C) 2008-2010 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <libmnl/libmnl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <errno.h>
+#include "internal.h"
+
+/**
+ * \mainpage
+ *
+ * libmnl is a minimalistic user-space library oriented to Netlink developers.
+ * There are a lot of common tasks in parsing, validating, constructing of
+ * both the Netlink header and TLVs that are repetitive and easy to get wrong.
+ * This library aims to provide simple helpers that allows you to avoid
+ * re-inventing the wheel in common Netlink tasks.
+ *
+ * \verbatim
+"Simplify, simplify" -- Henry David Thoureau. Walden (1854)
+\endverbatim
+ *
+ * The acronym libmnl stands for LIBrary Minimalistic NetLink.
+ *
+ * libmnl homepage is:
+ *      http://www.netfilter.org/projects/libmnl/
+ *
+ * \section features Main Features
+ * - Small: the shared library requires around 30KB for an x86-based computer.
+ * - Simple: this library avoids complex abstractions that tend to hide Netlink
+ *   details. It avoids elaborated object-oriented infrastructure and complex
+ *   callback-based workflow.
+ * - Easy to use: the library simplifies the work for Netlink-wise developers.
+ *   It provides functions to make socket handling, message building,
+ *   validating, parsing and sequence tracking, easier.
+ * - Easy to re-use: you can use this library to build your own abstraction
+ *   layer upon this library, if you want to provide another library that
+ *   hides Netlink details to your users.
+ * - Decoupling: the interdependency of the main bricks that compose this
+ *   library is reduced, i.e. the library provides many helpers, but the
+ *   programmer is not forced to use them.
+ *
+ * \section licensing Licensing terms
+ * This library is released under the LGPLv2.1 or any later (at your option).
+ *
+ * \section Dependencies
+ * You have to install the Linux kernel headers that you want to use to develop
+ * your application. Moreover, this library requires that you have some basics
+ * on Netlink.
+ *
+ * \section scm Git Tree
+ * The current development version of libmnl can be accessed at:
+ * https://git.netfilter.org/libmnl/
+ *
+ * \section using Using libmnl
+ * You can access several example files under examples/ in the libmnl source
+ * code tree.
+ */
+
+struct mnl_socket {
+	int 			fd;
+	struct sockaddr_nl	addr;
+};
+
+/**
+ * \defgroup socket Netlink socket helpers
+ * @{
+ */
+
+/**
+ * mnl_socket_get_fd - obtain file descriptor from netlink socket
+ * \param nl netlink socket obtained via mnl_socket_open()
+ *
+ * This function returns the file descriptor of a given netlink socket.
+ */
+EXPORT_SYMBOL int mnl_socket_get_fd(const struct mnl_socket *nl)
+{
+	return nl->fd;
+}
+
+/**
+ * mnl_socket_get_portid - obtain Netlink PortID from netlink socket
+ * \param nl netlink socket obtained via mnl_socket_open()
+ *
+ * This function returns the Netlink PortID of a given netlink socket.
+ * It's a common mistake to assume that this PortID equals the process ID
+ * 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.
+ */
+EXPORT_SYMBOL unsigned int mnl_socket_get_portid(const struct mnl_socket *nl)
+{
+	return nl->addr.nl_pid;
+}
+
+static struct mnl_socket *__mnl_socket_open(int bus, int flags)
+{
+	struct mnl_socket *nl;
+
+	nl = calloc(1, sizeof(struct mnl_socket));
+	if (nl == NULL)
+		return NULL;
+
+	nl->fd = socket(AF_NETLINK, SOCK_RAW | flags, bus);
+	if (nl->fd == -1) {
+		free(nl);
+		return NULL;
+	}
+
+	return nl;
+}
+
+/**
+ * mnl_socket_open - open a netlink socket
+ * \param bus the netlink socket bus ID (see NETLINK_* constants)
+ *
+ * On error, it returns NULL and errno is appropriately set. Otherwise, it
+ * returns a valid pointer to the mnl_socket structure.
+ */
+EXPORT_SYMBOL struct mnl_socket *mnl_socket_open(int bus)
+{
+	return __mnl_socket_open(bus, 0);
+}
+
+/**
+ * mnl_socket_open2 - open a netlink socket with appropriate flags
+ * \param bus the netlink socket bus ID (see NETLINK_* constants)
+ * \param flags the netlink socket flags (see SOCK_* constants in socket(2))
+ *
+ * This is similar to mnl_socket_open(), but allows one to set flags like
+ * SOCK_CLOEXEC at socket creation time (useful for multi-threaded programs
+ * performing exec calls).
+ *
+ * On error, it returns NULL and errno is appropriately set. Otherwise, it
+ * returns a valid pointer to the mnl_socket structure.
+ */
+EXPORT_SYMBOL struct mnl_socket *mnl_socket_open2(int bus, int flags)
+{
+	return __mnl_socket_open(bus, flags);
+}
+
+/**
+ * mnl_socket_fdopen - associates a mnl_socket object with pre-existing socket.
+ * \param fd pre-existing socket descriptor.
+ *
+ * On error, it returns NULL and errno is appropriately set. Otherwise, it
+ * returns a valid pointer to the mnl_socket structure. It also sets the portID
+ * if the socket fd is already bound and it is AF_NETLINK.
+ *
+ * Note that mnl_socket_get_portid() returns 0 if this function is used with
+ * non-netlink socket.
+ */
+EXPORT_SYMBOL struct mnl_socket *mnl_socket_fdopen(int fd)
+{
+	int ret;
+	struct mnl_socket *nl;
+	struct sockaddr_nl addr;
+	socklen_t addr_len = sizeof(struct sockaddr_nl);
+
+	ret = getsockname(fd, (struct sockaddr *) &addr, &addr_len);
+	if (ret == -1)
+		return NULL;
+
+	nl = calloc(1, sizeof(struct mnl_socket));
+	if (nl == NULL)
+		return NULL;
+
+	nl->fd = fd;
+	if (addr.nl_family == AF_NETLINK)
+		nl->addr = addr;
+
+	return nl;
+}
+
+/**
+ * mnl_socket_bind - bind netlink socket
+ * \param nl netlink socket obtained via mnl_socket_open()
+ * \param groups the group of message you're interested in
+ * \param pid the port ID you want to use (use zero for automatic selection)
+ *
+ * On error, this function returns -1 and errno is appropriately set. On
+ * success, 0 is returned. You can use MNL_SOCKET_AUTOPID which is 0 for
+ * automatic port ID selection.
+ */
+EXPORT_SYMBOL int mnl_socket_bind(struct mnl_socket *nl, unsigned int groups,
+				  pid_t pid)
+{
+	int ret;
+	socklen_t addr_len;
+
+	nl->addr.nl_family = AF_NETLINK;
+	nl->addr.nl_groups = groups;
+	nl->addr.nl_pid = pid;
+
+	ret = bind(nl->fd, (struct sockaddr *) &nl->addr, sizeof (nl->addr));
+	if (ret < 0)
+		return ret;
+
+	addr_len = sizeof(nl->addr);
+	ret = getsockname(nl->fd, (struct sockaddr *) &nl->addr, &addr_len);
+	if (ret < 0)	
+		return ret;
+
+	if (addr_len != sizeof(nl->addr)) {
+		errno = EINVAL;
+		return -1;
+	}
+	if (nl->addr.nl_family != AF_NETLINK) {
+		errno = EINVAL;
+		return -1;
+	}
+	return 0;
+}
+
+/**
+ * mnl_socket_sendto - send a netlink message of a certain size
+ * \param nl netlink socket obtained via mnl_socket_open()
+ * \param buf buffer containing the netlink message to be sent
+ * \param len number of bytes in the buffer that you want to send
+ *
+ * On error, it returns -1 and errno is appropriately set. Otherwise, it 
+ * returns the number of bytes sent.
+ */
+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
+	};
+	return sendto(nl->fd, buf, len, 0, 
+		      (struct sockaddr *) &snl, sizeof(snl));
+}
+
+/**
+ * mnl_socket_recvfrom - receive a netlink message
+ * \param nl netlink socket obtained via mnl_socket_open()
+ * \param buf buffer that you want to use to store the netlink message
+ * \param bufsiz size of the buffer passed to store the netlink message
+ *
+ * On error, it returns -1 and errno is appropriately set. If errno is set
+ * to ENOSPC, it means that the buffer that you have passed to store the
+ * netlink message is too small, so you have received a truncated message.
+ * To avoid this, you have to allocate a buffer of MNL_SOCKET_BUFFER_SIZE
+ * (which is 8KB, see linux/netlink.h for more information). Using this
+ * buffer size ensures that your buffer is big enough to store the netlink
+ * message without truncating it.
+ */
+EXPORT_SYMBOL ssize_t mnl_socket_recvfrom(const struct mnl_socket *nl,
+					  void *buf, size_t bufsiz)
+{
+	ssize_t ret;
+	struct sockaddr_nl addr;
+	struct iovec iov = {
+		.iov_base	= buf,
+		.iov_len	= bufsiz,
+	};
+	struct msghdr msg = {
+		.msg_name	= &addr,
+		.msg_namelen	= sizeof(struct sockaddr_nl),
+		.msg_iov	= &iov,
+		.msg_iovlen	= 1,
+		.msg_control	= NULL,
+		.msg_controllen	= 0,
+		.msg_flags	= 0,
+	};
+	ret = recvmsg(nl->fd, &msg, 0);
+	if (ret == -1)
+		return ret;
+
+	if (msg.msg_flags & MSG_TRUNC) {
+		errno = ENOSPC;
+		return -1;
+	}
+	if (msg.msg_namelen != sizeof(struct sockaddr_nl)) {
+		errno = EINVAL;
+		return -1;
+	}
+	return ret;
+}
+
+/**
+ * mnl_socket_close - close a given netlink socket
+ * \param nl netlink socket obtained via mnl_socket_open()
+ *
+ * On error, this function returns -1 and errno is appropriately set.
+ * On success, it returns 0.
+ */
+EXPORT_SYMBOL int mnl_socket_close(struct mnl_socket *nl)
+{
+	int ret = close(nl->fd);
+	free(nl);
+	return ret;
+}
+
+/**
+ * mnl_socket_setsockopt - set Netlink socket option
+ * \param nl netlink socket obtained via mnl_socket_open()
+ * \param type type of Netlink socket options
+ * \param buf the buffer that contains the data about this option
+ * \param len the size of the buffer passed
+ *
+ * This function allows you to set some Netlink socket option. As of writing
+ * this (see linux/netlink.h), the existing options are:
+ *
+ *	- \#define NETLINK_ADD_MEMBERSHIP  1
+ *	- \#define NETLINK_DROP_MEMBERSHIP 2
+ *	- \#define NETLINK_PKTINFO         3
+ *	- \#define NETLINK_BROADCAST_ERROR 4
+ *	- \#define NETLINK_NO_ENOBUFS      5
+ *
+ * In the early days, Netlink only supported 32 groups expressed in a
+ * 32-bits mask. However, since 2.6.14, Netlink may have up to 2^32 multicast
+ * groups but you have to use setsockopt() with NETLINK_ADD_MEMBERSHIP to
+ * join a given multicast group. This function internally calls setsockopt()
+ * to join a given netlink multicast group. You can still use mnl_bind()
+ * and the 32-bit mask to join a set of Netlink multicast groups.
+ *
+ * On error, this function returns -1 and errno is appropriately set.
+ */
+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);
+}
+
+/**
+ * mnl_socket_getsockopt - get a Netlink socket option
+ * \param nl netlink socket obtained via mnl_socket_open()
+ * \param type type of Netlink socket options
+ * \param buf pointer to the buffer to store the value of this option
+ * \param len size of the information written in the buffer
+ *
+ * On error, this function returns -1 and errno is appropriately set.
+ */
+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);
+}
+
+/**
+ * @}
+ */