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/* SPDX-License-Identifier: LGPL-2.1-only */ /* * Copyright (c) 2003-2013 Thomas Graf <[email protected]> */ #ifndef NETLINK_ATTR_H_ #define NETLINK_ATTR_H_ #include <netlink/netlink.h> #include <netlink/object.h> #include <netlink/addr.h> #include <netlink/data.h> #ifdef __cplusplus extern "C" { #endif struct nlattr; struct nl_msg; /** * @name Basic Attribute Data Types * @{ */ /** * @ingroup attr * Basic attribute data types * * See section @core_doc{core_attr_parse,Attribute Parsing} for more details. */ enum { NLA_UNSPEC, /**< Unspecified type, binary data chunk */ NLA_U8, /**< 8 bit integer */ NLA_U16, /**< 16 bit integer */ NLA_U32, /**< 32 bit integer */ NLA_U64, /**< 64 bit integer */ NLA_STRING, /**< NUL terminated character string */ NLA_FLAG, /**< Flag */ NLA_MSECS, /**< Micro seconds (64bit) */ NLA_NESTED, /**< Nested attributes */ NLA_NESTED_COMPAT, NLA_NUL_STRING, NLA_BINARY, NLA_S8, NLA_S16, NLA_S32, NLA_S64, __NLA_TYPE_MAX, }; #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) /** @} */ /** * @ingroup attr * Attribute validation policy. * * See section @core_doc{core_attr_parse,Attribute Parsing} for more details. */ struct nla_policy { /** Type of attribute or NLA_UNSPEC */ uint16_t type; /** Minimal length of payload required */ uint16_t minlen; /** Maximal length of payload allowed */ uint16_t maxlen; }; /* Size calculations */ extern int nla_attr_size(int payload); extern int nla_total_size(int payload); extern int nla_padlen(int payload); /* Attribute parsing */ extern int nla_type(const struct nlattr *); extern void * nla_data(const struct nlattr *); extern int nla_len(const struct nlattr *); extern int nla_ok(const struct nlattr *, int); extern struct nlattr * nla_next(const struct nlattr *, int *); extern int nla_parse(struct nlattr **, int, struct nlattr *, int, const struct nla_policy *); extern int nla_validate(const struct nlattr *, int, int, const struct nla_policy *); extern struct nlattr * nla_find(const struct nlattr *, int, int); /* Helper Functions */ extern int nla_memcpy(void *, const struct nlattr *, int); extern size_t nla_strlcpy(char *, const struct nlattr *, size_t); extern int nla_memcmp(const struct nlattr *, const void *, size_t); extern int nla_strcmp(const struct nlattr *, const char *); /* Unspecific attribute */ extern struct nlattr * nla_reserve(struct nl_msg *, int, int); extern int nla_put(struct nl_msg *, int, int, const void *); extern int nla_put_data(struct nl_msg *, int, const struct nl_data *); extern int nla_put_addr(struct nl_msg *, int, struct nl_addr *); /* Integer attribute */ extern int8_t nla_get_s8(const struct nlattr *); extern int nla_put_s8(struct nl_msg *, int, int8_t); extern uint8_t nla_get_u8(const struct nlattr *); extern int nla_put_u8(struct nl_msg *, int, uint8_t); extern int16_t nla_get_s16(const struct nlattr *); extern int nla_put_s16(struct nl_msg *, int, int16_t); extern uint16_t nla_get_u16(const struct nlattr *); extern int nla_put_u16(struct nl_msg *, int, uint16_t); extern int32_t nla_get_s32(const struct nlattr *); extern int nla_put_s32(struct nl_msg *, int, int32_t); extern uint32_t nla_get_u32(const struct nlattr *); extern int nla_put_u32(struct nl_msg *, int, uint32_t); extern int64_t nla_get_s64(const struct nlattr *); extern int nla_put_s64(struct nl_msg *, int, int64_t); extern uint64_t nla_get_u64(const struct nlattr *); extern int nla_put_u64(struct nl_msg *, int, uint64_t); /* String attribute */ extern char * nla_get_string(const struct nlattr *); extern char * nla_strdup(const struct nlattr *); extern int nla_put_string(struct nl_msg *, int, const char *); /* Flag attribute */ extern int nla_get_flag(const struct nlattr *); extern int nla_put_flag(struct nl_msg *, int); /* Msec attribute */ extern unsigned long nla_get_msecs(const struct nlattr *); extern int nla_put_msecs(struct nl_msg *, int, unsigned long); /* Attribute nesting */ extern int nla_put_nested(struct nl_msg *, int, const struct nl_msg *); extern struct nlattr * nla_nest_start(struct nl_msg *, int); extern int nla_nest_end(struct nl_msg *, struct nlattr *); extern int nla_nest_end_keep_empty(struct nl_msg *, struct nlattr *); extern void nla_nest_cancel(struct nl_msg *, const struct nlattr *); extern int nla_parse_nested(struct nlattr **, int, struct nlattr *, const struct nla_policy *); extern int nla_is_nested(const struct nlattr *); /** * @name Attribute Construction (Exception Based) * @{ */ /** * @ingroup attr * Add unspecific attribute to netlink message. * @arg msg Netlink message. * @arg attrtype Attribute type. * @arg attrlen Length of attribute payload. * @arg data Head of attribute payload. */ #define NLA_PUT(msg, attrtype, attrlen, data) \ do { \ if (nla_put(msg, attrtype, attrlen, data) < 0) \ goto nla_put_failure; \ } while(0) /** * @ingroup attr * Add atomic type attribute to netlink message. * @arg msg Netlink message. * @arg type Atomic type. * @arg attrtype Attribute type. * @arg value Head of attribute payload. */ #define NLA_PUT_TYPE(msg, type, attrtype, value) \ do { \ type __tmp = value; \ NLA_PUT(msg, attrtype, sizeof(type), &__tmp); \ } while(0) /** * Add 8 bit signed integer attribute to netlink message. * @arg msg Netlink message. * @arg attrtype Attribute type. * @arg value Numeric value. */ #define NLA_PUT_S8(msg, attrtype, value) \ NLA_PUT_TYPE(msg, int8_t, attrtype, value) /** * Add 8 bit integer attribute to netlink message. * @arg msg Netlink message. * @arg attrtype Attribute type. * @arg value Numeric value. */ #define NLA_PUT_U8(msg, attrtype, value) \ NLA_PUT_TYPE(msg, uint8_t, attrtype, value) /** * Add 16 bit signed integer attribute to netlink message. * @arg msg Netlink message. * @arg attrtype Attribute type. * @arg value Numeric value. */ #define NLA_PUT_S16(msg, attrtype, value) \ NLA_PUT_TYPE(msg, int16_t, attrtype, value) /** * Add 16 bit integer attribute to netlink message. * @arg msg Netlink message. * @arg attrtype Attribute type. * @arg value Numeric value. */ #define NLA_PUT_U16(msg, attrtype, value) \ NLA_PUT_TYPE(msg, uint16_t, attrtype, value) /** * Add 32 bit signed integer attribute to netlink message. * @arg msg Netlink message. * @arg attrtype Attribute type. * @arg value Numeric value. */ #define NLA_PUT_S32(msg, attrtype, value) \ NLA_PUT_TYPE(msg, int32_t, attrtype, value) /** * Add 32 bit integer attribute to netlink message. * @arg msg Netlink message. * @arg attrtype Attribute type. * @arg value Numeric value. */ #define NLA_PUT_U32(msg, attrtype, value) \ NLA_PUT_TYPE(msg, uint32_t, attrtype, value) /** * Add 64 bit signed integer attribute to netlink message. * @arg msg Netlink message. * @arg attrtype Attribute type. * @arg value Numeric value. */ #define NLA_PUT_S64(msg, attrtype, value) \ NLA_PUT_TYPE(msg, int64_t, attrtype, value) /** * Add 64 bit integer attribute to netlink message. * @arg msg Netlink message. * @arg attrtype Attribute type. * @arg value Numeric value. */ #define NLA_PUT_U64(msg, attrtype, value) \ NLA_PUT_TYPE(msg, uint64_t, attrtype, value) /** * Add string attribute to netlink message. * @arg msg Netlink message. * @arg attrtype Attribute type. * @arg value NUL terminated character string. */ #define NLA_PUT_STRING(msg, attrtype, value) \ NLA_PUT(msg, attrtype, (int) strlen(value) + 1, value) /** * Add flag attribute to netlink message. * @arg msg Netlink message. * @arg attrtype Attribute type. */ #define NLA_PUT_FLAG(msg, attrtype) \ NLA_PUT(msg, attrtype, 0, NULL) /** * Add msecs attribute to netlink message. * @arg msg Netlink message. * @arg attrtype Attribute type. * @arg msecs Numeric value in micro seconds. */ #define NLA_PUT_MSECS(msg, attrtype, msecs) \ NLA_PUT_U64(msg, attrtype, msecs) /** * Add address attribute to netlink message. * @arg msg Netlink message. * @arg attrtype Attribute type. * @arg addr Abstract address object. */ #define NLA_PUT_ADDR(msg, attrtype, addr) \ NLA_PUT(msg, attrtype, nl_addr_get_len(addr), \ nl_addr_get_binary_addr(addr)) /** * Add abstract data attribute to netlink message. * @arg msg Netlink message. * @arg attrtype Attribute type. * @arg data Abstract data object. */ #define NLA_PUT_DATA(msg, attrtype, data) \ NLA_PUT(msg, attrtype, nl_data_get_size(data), \ nl_data_get(data)) /** @} */ /** * @name Iterators * @{ */ /** * @ingroup attr * Iterate over a stream of attributes * @arg pos loop counter, set to current attribute * @arg head head of attribute stream * @arg len length of attribute stream * @arg rem initialized to len, holds bytes currently remaining in stream */ #define nla_for_each_attr(pos, head, len, rem) \ for (pos = head, rem = len; \ nla_ok(pos, rem); \ pos = nla_next(pos, &(rem))) /** * @ingroup attr * Iterate over a stream of nested attributes * @arg pos loop counter, set to current attribute * @arg nla attribute containing the nested attributes * @arg rem initialized to len, holds bytes currently remaining in stream */ #define nla_for_each_nested(pos, nla, rem) \ for (pos = (struct nlattr *) nla_data(nla), rem = nla_len(nla); \ nla_ok(pos, rem); \ pos = nla_next(pos, &(rem))) /** @} */ #ifdef __cplusplus } #endif #endif