1bfa83a9eSThomas Graf #ifndef __NET_NETLINK_H 2bfa83a9eSThomas Graf #define __NET_NETLINK_H 3bfa83a9eSThomas Graf 4bfa83a9eSThomas Graf #include <linux/types.h> 5bfa83a9eSThomas Graf #include <linux/netlink.h> 6d7fe0f24SAl Viro #include <linux/jiffies.h> 7bfa83a9eSThomas Graf 8bfa83a9eSThomas Graf /* ======================================================================== 9bfa83a9eSThomas Graf * Netlink Messages and Attributes Interface (As Seen On TV) 10bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 11bfa83a9eSThomas Graf * Messages Interface 12bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 13bfa83a9eSThomas Graf * 14bfa83a9eSThomas Graf * Message Format: 15bfa83a9eSThomas Graf * <--- nlmsg_total_size(payload) ---> 16bfa83a9eSThomas Graf * <-- nlmsg_msg_size(payload) -> 17bfa83a9eSThomas Graf * +----------+- - -+-------------+- - -+-------- - - 18bfa83a9eSThomas Graf * | nlmsghdr | Pad | Payload | Pad | nlmsghdr 19bfa83a9eSThomas Graf * +----------+- - -+-------------+- - -+-------- - - 20bfa83a9eSThomas Graf * nlmsg_data(nlh)---^ ^ 21bfa83a9eSThomas Graf * nlmsg_next(nlh)-----------------------+ 22bfa83a9eSThomas Graf * 23bfa83a9eSThomas Graf * Payload Format: 24bfa83a9eSThomas Graf * <---------------------- nlmsg_len(nlh) ---------------------> 25bfa83a9eSThomas Graf * <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) -> 26bfa83a9eSThomas Graf * +----------------------+- - -+--------------------------------+ 27bfa83a9eSThomas Graf * | Family Header | Pad | Attributes | 28bfa83a9eSThomas Graf * +----------------------+- - -+--------------------------------+ 29bfa83a9eSThomas Graf * nlmsg_attrdata(nlh, hdrlen)---^ 30bfa83a9eSThomas Graf * 31bfa83a9eSThomas Graf * Data Structures: 32bfa83a9eSThomas Graf * struct nlmsghdr netlink message header 33bfa83a9eSThomas Graf * 34bfa83a9eSThomas Graf * Message Construction: 35bfa83a9eSThomas Graf * nlmsg_new() create a new netlink message 36bfa83a9eSThomas Graf * nlmsg_put() add a netlink message to an skb 37bfa83a9eSThomas Graf * nlmsg_put_answer() callback based nlmsg_put() 38bfa83a9eSThomas Graf * nlmsg_end() finanlize netlink message 39fe4944e5SThomas Graf * nlmsg_get_pos() return current position in message 40fe4944e5SThomas Graf * nlmsg_trim() trim part of message 41bfa83a9eSThomas Graf * nlmsg_cancel() cancel message construction 42bfa83a9eSThomas Graf * nlmsg_free() free a netlink message 43bfa83a9eSThomas Graf * 44bfa83a9eSThomas Graf * Message Sending: 45bfa83a9eSThomas Graf * nlmsg_multicast() multicast message to several groups 46bfa83a9eSThomas Graf * nlmsg_unicast() unicast a message to a single socket 47d387f6adSThomas Graf * nlmsg_notify() send notification message 48bfa83a9eSThomas Graf * 49bfa83a9eSThomas Graf * Message Length Calculations: 50bfa83a9eSThomas Graf * nlmsg_msg_size(payload) length of message w/o padding 51bfa83a9eSThomas Graf * nlmsg_total_size(payload) length of message w/ padding 52bfa83a9eSThomas Graf * nlmsg_padlen(payload) length of padding at tail 53bfa83a9eSThomas Graf * 54bfa83a9eSThomas Graf * Message Payload Access: 55bfa83a9eSThomas Graf * nlmsg_data(nlh) head of message payload 56bfa83a9eSThomas Graf * nlmsg_len(nlh) length of message payload 57bfa83a9eSThomas Graf * nlmsg_attrdata(nlh, hdrlen) head of attributes data 58bfa83a9eSThomas Graf * nlmsg_attrlen(nlh, hdrlen) length of attributes data 59bfa83a9eSThomas Graf * 60bfa83a9eSThomas Graf * Message Parsing: 61bfa83a9eSThomas Graf * nlmsg_ok(nlh, remaining) does nlh fit into remaining bytes? 62bfa83a9eSThomas Graf * nlmsg_next(nlh, remaining) get next netlink message 63bfa83a9eSThomas Graf * nlmsg_parse() parse attributes of a message 64bfa83a9eSThomas Graf * nlmsg_find_attr() find an attribute in a message 65bfa83a9eSThomas Graf * nlmsg_for_each_msg() loop over all messages 66bfa83a9eSThomas Graf * nlmsg_validate() validate netlink message incl. attrs 67bfa83a9eSThomas Graf * nlmsg_for_each_attr() loop over all attributes 68bfa83a9eSThomas Graf * 6997676b6bSThomas Graf * Misc: 7097676b6bSThomas Graf * nlmsg_report() report back to application? 7197676b6bSThomas Graf * 72bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 73bfa83a9eSThomas Graf * Attributes Interface 74bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 75bfa83a9eSThomas Graf * 76bfa83a9eSThomas Graf * Attribute Format: 77bfa83a9eSThomas Graf * <------- nla_total_size(payload) -------> 78bfa83a9eSThomas Graf * <---- nla_attr_size(payload) -----> 79bfa83a9eSThomas Graf * +----------+- - -+- - - - - - - - - +- - -+-------- - - 80bfa83a9eSThomas Graf * | Header | Pad | Payload | Pad | Header 81bfa83a9eSThomas Graf * +----------+- - -+- - - - - - - - - +- - -+-------- - - 82bfa83a9eSThomas Graf * <- nla_len(nla) -> ^ 83bfa83a9eSThomas Graf * nla_data(nla)----^ | 84bfa83a9eSThomas Graf * nla_next(nla)-----------------------------' 85bfa83a9eSThomas Graf * 86bfa83a9eSThomas Graf * Data Structures: 87d1ec3b77SPierre Ynard * struct nlattr netlink attribute header 88bfa83a9eSThomas Graf * 89bfa83a9eSThomas Graf * Attribute Construction: 90fe4944e5SThomas Graf * nla_reserve(skb, type, len) reserve room for an attribute 91fe4944e5SThomas Graf * nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr 92bfa83a9eSThomas Graf * nla_put(skb, type, len, data) add attribute to skb 93fe4944e5SThomas Graf * nla_put_nohdr(skb, len, data) add attribute w/o hdr 94bfa83a9eSThomas Graf * 95bfa83a9eSThomas Graf * Attribute Construction for Basic Types: 96bfa83a9eSThomas Graf * nla_put_u8(skb, type, value) add u8 attribute to skb 97bfa83a9eSThomas Graf * nla_put_u16(skb, type, value) add u16 attribute to skb 98bfa83a9eSThomas Graf * nla_put_u32(skb, type, value) add u32 attribute to skb 99bfa83a9eSThomas Graf * nla_put_u64(skb, type, value) add u64 attribute to skb 100bfa83a9eSThomas Graf * nla_put_string(skb, type, str) add string attribute to skb 101bfa83a9eSThomas Graf * nla_put_flag(skb, type) add flag attribute to skb 102bfa83a9eSThomas Graf * nla_put_msecs(skb, type, jiffies) add msecs attribute to skb 103bfa83a9eSThomas Graf * 104bfa83a9eSThomas Graf * Exceptions Based Attribute Construction: 105bfa83a9eSThomas Graf * NLA_PUT(skb, type, len, data) add attribute to skb 106bfa83a9eSThomas Graf * NLA_PUT_U8(skb, type, value) add u8 attribute to skb 107bfa83a9eSThomas Graf * NLA_PUT_U16(skb, type, value) add u16 attribute to skb 108bfa83a9eSThomas Graf * NLA_PUT_U32(skb, type, value) add u32 attribute to skb 109bfa83a9eSThomas Graf * NLA_PUT_U64(skb, type, value) add u64 attribute to skb 110bfa83a9eSThomas Graf * NLA_PUT_STRING(skb, type, str) add string attribute to skb 111bfa83a9eSThomas Graf * NLA_PUT_FLAG(skb, type) add flag attribute to skb 112bfa83a9eSThomas Graf * NLA_PUT_MSECS(skb, type, jiffies) add msecs attribute to skb 113bfa83a9eSThomas Graf * 114bfa83a9eSThomas Graf * The meaning of these functions is equal to their lower case 115bfa83a9eSThomas Graf * variants but they jump to the label nla_put_failure in case 116bfa83a9eSThomas Graf * of a failure. 117bfa83a9eSThomas Graf * 118bfa83a9eSThomas Graf * Nested Attributes Construction: 119bfa83a9eSThomas Graf * nla_nest_start(skb, type) start a nested attribute 120bfa83a9eSThomas Graf * nla_nest_end(skb, nla) finalize a nested attribute 1211092cb21SPatrick McHardy * nla_nest_compat_start(skb, type, start a nested compat attribute 1221092cb21SPatrick McHardy * len, data) 1231092cb21SPatrick McHardy * nla_nest_compat_end(skb, type) finalize a nested compat attribute 124bfa83a9eSThomas Graf * nla_nest_cancel(skb, nla) cancel nested attribute construction 125bfa83a9eSThomas Graf * 126bfa83a9eSThomas Graf * Attribute Length Calculations: 127bfa83a9eSThomas Graf * nla_attr_size(payload) length of attribute w/o padding 128bfa83a9eSThomas Graf * nla_total_size(payload) length of attribute w/ padding 129bfa83a9eSThomas Graf * nla_padlen(payload) length of padding 130bfa83a9eSThomas Graf * 131bfa83a9eSThomas Graf * Attribute Payload Access: 132bfa83a9eSThomas Graf * nla_data(nla) head of attribute payload 133bfa83a9eSThomas Graf * nla_len(nla) length of attribute payload 134bfa83a9eSThomas Graf * 135bfa83a9eSThomas Graf * Attribute Payload Access for Basic Types: 136bfa83a9eSThomas Graf * nla_get_u8(nla) get payload for a u8 attribute 137bfa83a9eSThomas Graf * nla_get_u16(nla) get payload for a u16 attribute 138bfa83a9eSThomas Graf * nla_get_u32(nla) get payload for a u32 attribute 139bfa83a9eSThomas Graf * nla_get_u64(nla) get payload for a u64 attribute 140bfa83a9eSThomas Graf * nla_get_flag(nla) return 1 if flag is true 141bfa83a9eSThomas Graf * nla_get_msecs(nla) get payload for a msecs attribute 142bfa83a9eSThomas Graf * 143bfa83a9eSThomas Graf * Attribute Misc: 144bfa83a9eSThomas Graf * nla_memcpy(dest, nla, count) copy attribute into memory 145bfa83a9eSThomas Graf * nla_memcmp(nla, data, size) compare attribute with memory area 146bfa83a9eSThomas Graf * nla_strlcpy(dst, nla, size) copy attribute to a sized string 147bfa83a9eSThomas Graf * nla_strcmp(nla, str) compare attribute with string 148bfa83a9eSThomas Graf * 149bfa83a9eSThomas Graf * Attribute Parsing: 150bfa83a9eSThomas Graf * nla_ok(nla, remaining) does nla fit into remaining bytes? 151bfa83a9eSThomas Graf * nla_next(nla, remaining) get next netlink attribute 152bfa83a9eSThomas Graf * nla_validate() validate a stream of attributes 1534fe5d5c0SPaul Moore * nla_validate_nested() validate a stream of nested attributes 154bfa83a9eSThomas Graf * nla_find() find attribute in stream of attributes 155fe4944e5SThomas Graf * nla_find_nested() find attribute in nested attributes 156bfa83a9eSThomas Graf * nla_parse() parse and validate stream of attrs 157bfa83a9eSThomas Graf * nla_parse_nested() parse nested attribuets 1581092cb21SPatrick McHardy * nla_parse_nested_compat() parse nested compat attributes 159bfa83a9eSThomas Graf * nla_for_each_attr() loop over all attributes 16022acb19aSPaul Moore * nla_for_each_nested() loop over the nested attributes 161bfa83a9eSThomas Graf *========================================================================= 162bfa83a9eSThomas Graf */ 163bfa83a9eSThomas Graf 164bfa83a9eSThomas Graf /** 165bfa83a9eSThomas Graf * Standard attribute types to specify validation policy 166bfa83a9eSThomas Graf */ 167bfa83a9eSThomas Graf enum { 168bfa83a9eSThomas Graf NLA_UNSPEC, 169bfa83a9eSThomas Graf NLA_U8, 170bfa83a9eSThomas Graf NLA_U16, 171bfa83a9eSThomas Graf NLA_U32, 172bfa83a9eSThomas Graf NLA_U64, 173bfa83a9eSThomas Graf NLA_STRING, 174bfa83a9eSThomas Graf NLA_FLAG, 175bfa83a9eSThomas Graf NLA_MSECS, 176bfa83a9eSThomas Graf NLA_NESTED, 1771092cb21SPatrick McHardy NLA_NESTED_COMPAT, 178a5531a5dSThomas Graf NLA_NUL_STRING, 179d30045a0SJohannes Berg NLA_BINARY, 180bfa83a9eSThomas Graf __NLA_TYPE_MAX, 181bfa83a9eSThomas Graf }; 182bfa83a9eSThomas Graf 183bfa83a9eSThomas Graf #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) 184bfa83a9eSThomas Graf 185bfa83a9eSThomas Graf /** 186bfa83a9eSThomas Graf * struct nla_policy - attribute validation policy 187bfa83a9eSThomas Graf * @type: Type of attribute or NLA_UNSPEC 188a5531a5dSThomas Graf * @len: Type specific length of payload 189bfa83a9eSThomas Graf * 190bfa83a9eSThomas Graf * Policies are defined as arrays of this struct, the array must be 191bfa83a9eSThomas Graf * accessible by attribute type up to the highest identifier to be expected. 192bfa83a9eSThomas Graf * 193a5531a5dSThomas Graf * Meaning of `len' field: 194a5531a5dSThomas Graf * NLA_STRING Maximum length of string 195a5531a5dSThomas Graf * NLA_NUL_STRING Maximum length of string (excluding NUL) 196a5531a5dSThomas Graf * NLA_FLAG Unused 197d30045a0SJohannes Berg * NLA_BINARY Maximum length of attribute payload 1981092cb21SPatrick McHardy * NLA_NESTED_COMPAT Exact length of structure payload 199a5531a5dSThomas Graf * All other Exact length of attribute payload 200a5531a5dSThomas Graf * 201bfa83a9eSThomas Graf * Example: 202bfa83a9eSThomas Graf * static struct nla_policy my_policy[ATTR_MAX+1] __read_mostly = { 203bfa83a9eSThomas Graf * [ATTR_FOO] = { .type = NLA_U16 }, 204d30045a0SJohannes Berg * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ }, 205a5531a5dSThomas Graf * [ATTR_BAZ] = { .len = sizeof(struct mystruct) }, 206bfa83a9eSThomas Graf * }; 207bfa83a9eSThomas Graf */ 208bfa83a9eSThomas Graf struct nla_policy { 209bfa83a9eSThomas Graf u16 type; 210a5531a5dSThomas Graf u16 len; 211bfa83a9eSThomas Graf }; 212bfa83a9eSThomas Graf 2134e902c57SThomas Graf /** 2144e902c57SThomas Graf * struct nl_info - netlink source information 2154e902c57SThomas Graf * @nlh: Netlink message header of original request 2164e902c57SThomas Graf * @pid: Netlink PID of requesting application 2174e902c57SThomas Graf */ 2184e902c57SThomas Graf struct nl_info { 2194e902c57SThomas Graf struct nlmsghdr *nlh; 2204e902c57SThomas Graf u32 pid; 2214e902c57SThomas Graf }; 2224e902c57SThomas Graf 223cd40b7d3SDenis V. Lunev extern int netlink_rcv_skb(struct sk_buff *skb, 22482ace47aSThomas Graf int (*cb)(struct sk_buff *, 2251d00a4ebSThomas Graf struct nlmsghdr *)); 22697676b6bSThomas Graf extern int nlmsg_notify(struct sock *sk, struct sk_buff *skb, 22797676b6bSThomas Graf u32 pid, unsigned int group, int report, 22897676b6bSThomas Graf gfp_t flags); 22982ace47aSThomas Graf 230bfa83a9eSThomas Graf extern int nla_validate(struct nlattr *head, int len, int maxtype, 231ef7c79edSPatrick McHardy const struct nla_policy *policy); 232bfa83a9eSThomas Graf extern int nla_parse(struct nlattr *tb[], int maxtype, 233bfa83a9eSThomas Graf struct nlattr *head, int len, 234ef7c79edSPatrick McHardy const struct nla_policy *policy); 235bfa83a9eSThomas Graf extern struct nlattr * nla_find(struct nlattr *head, int len, int attrtype); 236bfa83a9eSThomas Graf extern size_t nla_strlcpy(char *dst, const struct nlattr *nla, 237bfa83a9eSThomas Graf size_t dstsize); 238bfa83a9eSThomas Graf extern int nla_memcpy(void *dest, struct nlattr *src, int count); 239bfa83a9eSThomas Graf extern int nla_memcmp(const struct nlattr *nla, const void *data, 240bfa83a9eSThomas Graf size_t size); 241bfa83a9eSThomas Graf extern int nla_strcmp(const struct nlattr *nla, const char *str); 242bfa83a9eSThomas Graf extern struct nlattr * __nla_reserve(struct sk_buff *skb, int attrtype, 243bfa83a9eSThomas Graf int attrlen); 244fe4944e5SThomas Graf extern void * __nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 245bfa83a9eSThomas Graf extern struct nlattr * nla_reserve(struct sk_buff *skb, int attrtype, 246bfa83a9eSThomas Graf int attrlen); 247fe4944e5SThomas Graf extern void * nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 248bfa83a9eSThomas Graf extern void __nla_put(struct sk_buff *skb, int attrtype, 249bfa83a9eSThomas Graf int attrlen, const void *data); 250fe4944e5SThomas Graf extern void __nla_put_nohdr(struct sk_buff *skb, int attrlen, 251fe4944e5SThomas Graf const void *data); 252bfa83a9eSThomas Graf extern int nla_put(struct sk_buff *skb, int attrtype, 253bfa83a9eSThomas Graf int attrlen, const void *data); 254fe4944e5SThomas Graf extern int nla_put_nohdr(struct sk_buff *skb, int attrlen, 255fe4944e5SThomas Graf const void *data); 256bfa83a9eSThomas Graf 257bfa83a9eSThomas Graf /************************************************************************** 258bfa83a9eSThomas Graf * Netlink Messages 259bfa83a9eSThomas Graf **************************************************************************/ 260bfa83a9eSThomas Graf 261bfa83a9eSThomas Graf /** 262bfa83a9eSThomas Graf * nlmsg_msg_size - length of netlink message not including padding 263bfa83a9eSThomas Graf * @payload: length of message payload 264bfa83a9eSThomas Graf */ 265bfa83a9eSThomas Graf static inline int nlmsg_msg_size(int payload) 266bfa83a9eSThomas Graf { 267bfa83a9eSThomas Graf return NLMSG_HDRLEN + payload; 268bfa83a9eSThomas Graf } 269bfa83a9eSThomas Graf 270bfa83a9eSThomas Graf /** 271bfa83a9eSThomas Graf * nlmsg_total_size - length of netlink message including padding 272bfa83a9eSThomas Graf * @payload: length of message payload 273bfa83a9eSThomas Graf */ 274bfa83a9eSThomas Graf static inline int nlmsg_total_size(int payload) 275bfa83a9eSThomas Graf { 276bfa83a9eSThomas Graf return NLMSG_ALIGN(nlmsg_msg_size(payload)); 277bfa83a9eSThomas Graf } 278bfa83a9eSThomas Graf 279bfa83a9eSThomas Graf /** 280bfa83a9eSThomas Graf * nlmsg_padlen - length of padding at the message's tail 281bfa83a9eSThomas Graf * @payload: length of message payload 282bfa83a9eSThomas Graf */ 283bfa83a9eSThomas Graf static inline int nlmsg_padlen(int payload) 284bfa83a9eSThomas Graf { 285bfa83a9eSThomas Graf return nlmsg_total_size(payload) - nlmsg_msg_size(payload); 286bfa83a9eSThomas Graf } 287bfa83a9eSThomas Graf 288bfa83a9eSThomas Graf /** 289bfa83a9eSThomas Graf * nlmsg_data - head of message payload 290bfa83a9eSThomas Graf * @nlh: netlink messsage header 291bfa83a9eSThomas Graf */ 292bfa83a9eSThomas Graf static inline void *nlmsg_data(const struct nlmsghdr *nlh) 293bfa83a9eSThomas Graf { 294bfa83a9eSThomas Graf return (unsigned char *) nlh + NLMSG_HDRLEN; 295bfa83a9eSThomas Graf } 296bfa83a9eSThomas Graf 297bfa83a9eSThomas Graf /** 298bfa83a9eSThomas Graf * nlmsg_len - length of message payload 299bfa83a9eSThomas Graf * @nlh: netlink message header 300bfa83a9eSThomas Graf */ 301bfa83a9eSThomas Graf static inline int nlmsg_len(const struct nlmsghdr *nlh) 302bfa83a9eSThomas Graf { 303bfa83a9eSThomas Graf return nlh->nlmsg_len - NLMSG_HDRLEN; 304bfa83a9eSThomas Graf } 305bfa83a9eSThomas Graf 306bfa83a9eSThomas Graf /** 307bfa83a9eSThomas Graf * nlmsg_attrdata - head of attributes data 308bfa83a9eSThomas Graf * @nlh: netlink message header 309bfa83a9eSThomas Graf * @hdrlen: length of family specific header 310bfa83a9eSThomas Graf */ 311bfa83a9eSThomas Graf static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, 312bfa83a9eSThomas Graf int hdrlen) 313bfa83a9eSThomas Graf { 314bfa83a9eSThomas Graf unsigned char *data = nlmsg_data(nlh); 315bfa83a9eSThomas Graf return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); 316bfa83a9eSThomas Graf } 317bfa83a9eSThomas Graf 318bfa83a9eSThomas Graf /** 319bfa83a9eSThomas Graf * nlmsg_attrlen - length of attributes data 320bfa83a9eSThomas Graf * @nlh: netlink message header 321bfa83a9eSThomas Graf * @hdrlen: length of family specific header 322bfa83a9eSThomas Graf */ 323bfa83a9eSThomas Graf static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) 324bfa83a9eSThomas Graf { 325bfa83a9eSThomas Graf return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); 326bfa83a9eSThomas Graf } 327bfa83a9eSThomas Graf 328bfa83a9eSThomas Graf /** 329bfa83a9eSThomas Graf * nlmsg_ok - check if the netlink message fits into the remaining bytes 330bfa83a9eSThomas Graf * @nlh: netlink message header 331bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 332bfa83a9eSThomas Graf */ 333bfa83a9eSThomas Graf static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) 334bfa83a9eSThomas Graf { 335bfa83a9eSThomas Graf return (remaining >= sizeof(struct nlmsghdr) && 336bfa83a9eSThomas Graf nlh->nlmsg_len >= sizeof(struct nlmsghdr) && 337bfa83a9eSThomas Graf nlh->nlmsg_len <= remaining); 338bfa83a9eSThomas Graf } 339bfa83a9eSThomas Graf 340bfa83a9eSThomas Graf /** 341bfa83a9eSThomas Graf * nlmsg_next - next netlink message in message stream 342bfa83a9eSThomas Graf * @nlh: netlink message header 343bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 344bfa83a9eSThomas Graf * 345bfa83a9eSThomas Graf * Returns the next netlink message in the message stream and 346bfa83a9eSThomas Graf * decrements remaining by the size of the current message. 347bfa83a9eSThomas Graf */ 348bfa83a9eSThomas Graf static inline struct nlmsghdr *nlmsg_next(struct nlmsghdr *nlh, int *remaining) 349bfa83a9eSThomas Graf { 350bfa83a9eSThomas Graf int totlen = NLMSG_ALIGN(nlh->nlmsg_len); 351bfa83a9eSThomas Graf 352bfa83a9eSThomas Graf *remaining -= totlen; 353bfa83a9eSThomas Graf 354bfa83a9eSThomas Graf return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); 355bfa83a9eSThomas Graf } 356bfa83a9eSThomas Graf 357bfa83a9eSThomas Graf /** 358bfa83a9eSThomas Graf * nlmsg_parse - parse attributes of a netlink message 359bfa83a9eSThomas Graf * @nlh: netlink message header 360bfa83a9eSThomas Graf * @hdrlen: length of family specific header 361bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 362bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 363bfa83a9eSThomas Graf * @policy: validation policy 364bfa83a9eSThomas Graf * 365bfa83a9eSThomas Graf * See nla_parse() 366bfa83a9eSThomas Graf */ 367bfa83a9eSThomas Graf static inline int nlmsg_parse(struct nlmsghdr *nlh, int hdrlen, 368bfa83a9eSThomas Graf struct nlattr *tb[], int maxtype, 369ef7c79edSPatrick McHardy const struct nla_policy *policy) 370bfa83a9eSThomas Graf { 371bfa83a9eSThomas Graf if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) 372bfa83a9eSThomas Graf return -EINVAL; 373bfa83a9eSThomas Graf 374bfa83a9eSThomas Graf return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), 375bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), policy); 376bfa83a9eSThomas Graf } 377bfa83a9eSThomas Graf 378bfa83a9eSThomas Graf /** 379bfa83a9eSThomas Graf * nlmsg_find_attr - find a specific attribute in a netlink message 380bfa83a9eSThomas Graf * @nlh: netlink message header 381bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 382bfa83a9eSThomas Graf * @attrtype: type of attribute to look for 383bfa83a9eSThomas Graf * 384bfa83a9eSThomas Graf * Returns the first attribute which matches the specified type. 385bfa83a9eSThomas Graf */ 386bfa83a9eSThomas Graf static inline struct nlattr *nlmsg_find_attr(struct nlmsghdr *nlh, 387bfa83a9eSThomas Graf int hdrlen, int attrtype) 388bfa83a9eSThomas Graf { 389bfa83a9eSThomas Graf return nla_find(nlmsg_attrdata(nlh, hdrlen), 390bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), attrtype); 391bfa83a9eSThomas Graf } 392bfa83a9eSThomas Graf 393bfa83a9eSThomas Graf /** 394bfa83a9eSThomas Graf * nlmsg_validate - validate a netlink message including attributes 395bfa83a9eSThomas Graf * @nlh: netlinket message header 396bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 397bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 398bfa83a9eSThomas Graf * @policy: validation policy 399bfa83a9eSThomas Graf */ 400bfa83a9eSThomas Graf static inline int nlmsg_validate(struct nlmsghdr *nlh, int hdrlen, int maxtype, 401ef7c79edSPatrick McHardy const struct nla_policy *policy) 402bfa83a9eSThomas Graf { 403bfa83a9eSThomas Graf if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) 404bfa83a9eSThomas Graf return -EINVAL; 405bfa83a9eSThomas Graf 406bfa83a9eSThomas Graf return nla_validate(nlmsg_attrdata(nlh, hdrlen), 407bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), maxtype, policy); 408bfa83a9eSThomas Graf } 409bfa83a9eSThomas Graf 410bfa83a9eSThomas Graf /** 41197676b6bSThomas Graf * nlmsg_report - need to report back to application? 41297676b6bSThomas Graf * @nlh: netlink message header 41397676b6bSThomas Graf * 41497676b6bSThomas Graf * Returns 1 if a report back to the application is requested. 41597676b6bSThomas Graf */ 41697676b6bSThomas Graf static inline int nlmsg_report(struct nlmsghdr *nlh) 41797676b6bSThomas Graf { 41897676b6bSThomas Graf return !!(nlh->nlmsg_flags & NLM_F_ECHO); 41997676b6bSThomas Graf } 42097676b6bSThomas Graf 42197676b6bSThomas Graf /** 422bfa83a9eSThomas Graf * nlmsg_for_each_attr - iterate over a stream of attributes 423bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 424bfa83a9eSThomas Graf * @nlh: netlink message header 425bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 426bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 427bfa83a9eSThomas Graf */ 428bfa83a9eSThomas Graf #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ 429bfa83a9eSThomas Graf nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ 430bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), rem) 431bfa83a9eSThomas Graf 432bfa83a9eSThomas Graf #if 0 433bfa83a9eSThomas Graf /* FIXME: Enable once all users have been converted */ 434bfa83a9eSThomas Graf 435bfa83a9eSThomas Graf /** 436bfa83a9eSThomas Graf * __nlmsg_put - Add a new netlink message to an skb 437bfa83a9eSThomas Graf * @skb: socket buffer to store message in 438bfa83a9eSThomas Graf * @pid: netlink process id 439bfa83a9eSThomas Graf * @seq: sequence number of message 440bfa83a9eSThomas Graf * @type: message type 441bfa83a9eSThomas Graf * @payload: length of message payload 442bfa83a9eSThomas Graf * @flags: message flags 443bfa83a9eSThomas Graf * 444bfa83a9eSThomas Graf * The caller is responsible to ensure that the skb provides enough 445bfa83a9eSThomas Graf * tailroom for both the netlink header and payload. 446bfa83a9eSThomas Graf */ 447bfa83a9eSThomas Graf static inline struct nlmsghdr *__nlmsg_put(struct sk_buff *skb, u32 pid, 448bfa83a9eSThomas Graf u32 seq, int type, int payload, 449bfa83a9eSThomas Graf int flags) 450bfa83a9eSThomas Graf { 451bfa83a9eSThomas Graf struct nlmsghdr *nlh; 452bfa83a9eSThomas Graf 453bfa83a9eSThomas Graf nlh = (struct nlmsghdr *) skb_put(skb, nlmsg_total_size(payload)); 454bfa83a9eSThomas Graf nlh->nlmsg_type = type; 455bfa83a9eSThomas Graf nlh->nlmsg_len = nlmsg_msg_size(payload); 456bfa83a9eSThomas Graf nlh->nlmsg_flags = flags; 457bfa83a9eSThomas Graf nlh->nlmsg_pid = pid; 458bfa83a9eSThomas Graf nlh->nlmsg_seq = seq; 459bfa83a9eSThomas Graf 460bfa83a9eSThomas Graf memset((unsigned char *) nlmsg_data(nlh) + payload, 0, 461bfa83a9eSThomas Graf nlmsg_padlen(payload)); 462bfa83a9eSThomas Graf 463bfa83a9eSThomas Graf return nlh; 464bfa83a9eSThomas Graf } 465bfa83a9eSThomas Graf #endif 466bfa83a9eSThomas Graf 467bfa83a9eSThomas Graf /** 468bfa83a9eSThomas Graf * nlmsg_put - Add a new netlink message to an skb 469bfa83a9eSThomas Graf * @skb: socket buffer to store message in 470bfa83a9eSThomas Graf * @pid: netlink process id 471bfa83a9eSThomas Graf * @seq: sequence number of message 472bfa83a9eSThomas Graf * @type: message type 473bfa83a9eSThomas Graf * @payload: length of message payload 474bfa83a9eSThomas Graf * @flags: message flags 475bfa83a9eSThomas Graf * 476bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 477bfa83a9eSThomas Graf * the message header and payload. 478bfa83a9eSThomas Graf */ 479bfa83a9eSThomas Graf static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, 480bfa83a9eSThomas Graf int type, int payload, int flags) 481bfa83a9eSThomas Graf { 482bfa83a9eSThomas Graf if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) 483bfa83a9eSThomas Graf return NULL; 484bfa83a9eSThomas Graf 485bfa83a9eSThomas Graf return __nlmsg_put(skb, pid, seq, type, payload, flags); 486bfa83a9eSThomas Graf } 487bfa83a9eSThomas Graf 488bfa83a9eSThomas Graf /** 489bfa83a9eSThomas Graf * nlmsg_put_answer - Add a new callback based netlink message to an skb 490bfa83a9eSThomas Graf * @skb: socket buffer to store message in 491bfa83a9eSThomas Graf * @cb: netlink callback 492bfa83a9eSThomas Graf * @type: message type 493bfa83a9eSThomas Graf * @payload: length of message payload 494bfa83a9eSThomas Graf * @flags: message flags 495bfa83a9eSThomas Graf * 496bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 497bfa83a9eSThomas Graf * the message header and payload. 498bfa83a9eSThomas Graf */ 499bfa83a9eSThomas Graf static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, 500bfa83a9eSThomas Graf struct netlink_callback *cb, 501bfa83a9eSThomas Graf int type, int payload, 502bfa83a9eSThomas Graf int flags) 503bfa83a9eSThomas Graf { 504bfa83a9eSThomas Graf return nlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, 505bfa83a9eSThomas Graf type, payload, flags); 506bfa83a9eSThomas Graf } 507bfa83a9eSThomas Graf 508bfa83a9eSThomas Graf /** 509bfa83a9eSThomas Graf * nlmsg_new - Allocate a new netlink message 510339bf98fSThomas Graf * @payload: size of the message payload 511fe4944e5SThomas Graf * @flags: the type of memory to allocate. 512bfa83a9eSThomas Graf * 513339bf98fSThomas Graf * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known 514339bf98fSThomas Graf * and a good default is needed. 515bfa83a9eSThomas Graf */ 516339bf98fSThomas Graf static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) 517bfa83a9eSThomas Graf { 518339bf98fSThomas Graf return alloc_skb(nlmsg_total_size(payload), flags); 519bfa83a9eSThomas Graf } 520bfa83a9eSThomas Graf 521bfa83a9eSThomas Graf /** 522bfa83a9eSThomas Graf * nlmsg_end - Finalize a netlink message 523bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 524bfa83a9eSThomas Graf * @nlh: netlink message header 525bfa83a9eSThomas Graf * 526bfa83a9eSThomas Graf * Corrects the netlink message header to include the appeneded 527bfa83a9eSThomas Graf * attributes. Only necessary if attributes have been added to 528bfa83a9eSThomas Graf * the message. 529bfa83a9eSThomas Graf * 530bfa83a9eSThomas Graf * Returns the total data length of the skb. 531bfa83a9eSThomas Graf */ 532bfa83a9eSThomas Graf static inline int nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) 533bfa83a9eSThomas Graf { 53427a884dcSArnaldo Carvalho de Melo nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; 535bfa83a9eSThomas Graf 536bfa83a9eSThomas Graf return skb->len; 537bfa83a9eSThomas Graf } 538bfa83a9eSThomas Graf 539bfa83a9eSThomas Graf /** 540fe4944e5SThomas Graf * nlmsg_get_pos - return current position in netlink message 541fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 542fe4944e5SThomas Graf * 543fe4944e5SThomas Graf * Returns a pointer to the current tail of the message. 544fe4944e5SThomas Graf */ 545fe4944e5SThomas Graf static inline void *nlmsg_get_pos(struct sk_buff *skb) 546fe4944e5SThomas Graf { 54727a884dcSArnaldo Carvalho de Melo return skb_tail_pointer(skb); 548fe4944e5SThomas Graf } 549fe4944e5SThomas Graf 550fe4944e5SThomas Graf /** 551fe4944e5SThomas Graf * nlmsg_trim - Trim message to a mark 552fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 553fe4944e5SThomas Graf * @mark: mark to trim to 554fe4944e5SThomas Graf * 555fe4944e5SThomas Graf * Trims the message to the provided mark. Returns -1. 556fe4944e5SThomas Graf */ 557dc5fc579SArnaldo Carvalho de Melo static inline int nlmsg_trim(struct sk_buff *skb, const void *mark) 558fe4944e5SThomas Graf { 559fe4944e5SThomas Graf if (mark) 560fe4944e5SThomas Graf skb_trim(skb, (unsigned char *) mark - skb->data); 561fe4944e5SThomas Graf 562fe4944e5SThomas Graf return -1; 563fe4944e5SThomas Graf } 564fe4944e5SThomas Graf 565fe4944e5SThomas Graf /** 566bfa83a9eSThomas Graf * nlmsg_cancel - Cancel construction of a netlink message 567bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 568bfa83a9eSThomas Graf * @nlh: netlink message header 569bfa83a9eSThomas Graf * 570bfa83a9eSThomas Graf * Removes the complete netlink message including all 571bfa83a9eSThomas Graf * attributes from the socket buffer again. Returns -1. 572bfa83a9eSThomas Graf */ 573bfa83a9eSThomas Graf static inline int nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) 574bfa83a9eSThomas Graf { 575fe4944e5SThomas Graf return nlmsg_trim(skb, nlh); 576bfa83a9eSThomas Graf } 577bfa83a9eSThomas Graf 578bfa83a9eSThomas Graf /** 579bfa83a9eSThomas Graf * nlmsg_free - free a netlink message 580bfa83a9eSThomas Graf * @skb: socket buffer of netlink message 581bfa83a9eSThomas Graf */ 582bfa83a9eSThomas Graf static inline void nlmsg_free(struct sk_buff *skb) 583bfa83a9eSThomas Graf { 584bfa83a9eSThomas Graf kfree_skb(skb); 585bfa83a9eSThomas Graf } 586bfa83a9eSThomas Graf 587bfa83a9eSThomas Graf /** 588bfa83a9eSThomas Graf * nlmsg_multicast - multicast a netlink message 589bfa83a9eSThomas Graf * @sk: netlink socket to spread messages to 590bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 591bfa83a9eSThomas Graf * @pid: own netlink pid to avoid sending to yourself 592bfa83a9eSThomas Graf * @group: multicast group id 593d387f6adSThomas Graf * @flags: allocation flags 594bfa83a9eSThomas Graf */ 595bfa83a9eSThomas Graf static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, 596d387f6adSThomas Graf u32 pid, unsigned int group, gfp_t flags) 597bfa83a9eSThomas Graf { 598bfa83a9eSThomas Graf int err; 599bfa83a9eSThomas Graf 600bfa83a9eSThomas Graf NETLINK_CB(skb).dst_group = group; 601bfa83a9eSThomas Graf 602d387f6adSThomas Graf err = netlink_broadcast(sk, skb, pid, group, flags); 603bfa83a9eSThomas Graf if (err > 0) 604bfa83a9eSThomas Graf err = 0; 605bfa83a9eSThomas Graf 606bfa83a9eSThomas Graf return err; 607bfa83a9eSThomas Graf } 608bfa83a9eSThomas Graf 609bfa83a9eSThomas Graf /** 610bfa83a9eSThomas Graf * nlmsg_unicast - unicast a netlink message 611bfa83a9eSThomas Graf * @sk: netlink socket to spread message to 612bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 613bfa83a9eSThomas Graf * @pid: netlink pid of the destination socket 614bfa83a9eSThomas Graf */ 615bfa83a9eSThomas Graf static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 pid) 616bfa83a9eSThomas Graf { 617bfa83a9eSThomas Graf int err; 618bfa83a9eSThomas Graf 619bfa83a9eSThomas Graf err = netlink_unicast(sk, skb, pid, MSG_DONTWAIT); 620bfa83a9eSThomas Graf if (err > 0) 621bfa83a9eSThomas Graf err = 0; 622bfa83a9eSThomas Graf 623bfa83a9eSThomas Graf return err; 624bfa83a9eSThomas Graf } 625bfa83a9eSThomas Graf 626bfa83a9eSThomas Graf /** 627bfa83a9eSThomas Graf * nlmsg_for_each_msg - iterate over a stream of messages 628bfa83a9eSThomas Graf * @pos: loop counter, set to current message 629bfa83a9eSThomas Graf * @head: head of message stream 630bfa83a9eSThomas Graf * @len: length of message stream 631bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 632bfa83a9eSThomas Graf */ 633bfa83a9eSThomas Graf #define nlmsg_for_each_msg(pos, head, len, rem) \ 634bfa83a9eSThomas Graf for (pos = head, rem = len; \ 635bfa83a9eSThomas Graf nlmsg_ok(pos, rem); \ 636bfa83a9eSThomas Graf pos = nlmsg_next(pos, &(rem))) 637bfa83a9eSThomas Graf 638bfa83a9eSThomas Graf /************************************************************************** 639bfa83a9eSThomas Graf * Netlink Attributes 640bfa83a9eSThomas Graf **************************************************************************/ 641bfa83a9eSThomas Graf 642bfa83a9eSThomas Graf /** 643bfa83a9eSThomas Graf * nla_attr_size - length of attribute not including padding 644bfa83a9eSThomas Graf * @payload: length of payload 645bfa83a9eSThomas Graf */ 646bfa83a9eSThomas Graf static inline int nla_attr_size(int payload) 647bfa83a9eSThomas Graf { 648bfa83a9eSThomas Graf return NLA_HDRLEN + payload; 649bfa83a9eSThomas Graf } 650bfa83a9eSThomas Graf 651bfa83a9eSThomas Graf /** 652bfa83a9eSThomas Graf * nla_total_size - total length of attribute including padding 653bfa83a9eSThomas Graf * @payload: length of payload 654bfa83a9eSThomas Graf */ 655bfa83a9eSThomas Graf static inline int nla_total_size(int payload) 656bfa83a9eSThomas Graf { 657bfa83a9eSThomas Graf return NLA_ALIGN(nla_attr_size(payload)); 658bfa83a9eSThomas Graf } 659bfa83a9eSThomas Graf 660bfa83a9eSThomas Graf /** 661bfa83a9eSThomas Graf * nla_padlen - length of padding at the tail of attribute 662bfa83a9eSThomas Graf * @payload: length of payload 663bfa83a9eSThomas Graf */ 664bfa83a9eSThomas Graf static inline int nla_padlen(int payload) 665bfa83a9eSThomas Graf { 666bfa83a9eSThomas Graf return nla_total_size(payload) - nla_attr_size(payload); 667bfa83a9eSThomas Graf } 668bfa83a9eSThomas Graf 669bfa83a9eSThomas Graf /** 6708f4c1f9bSThomas Graf * nla_type - attribute type 6718f4c1f9bSThomas Graf * @nla: netlink attribute 6728f4c1f9bSThomas Graf */ 6738f4c1f9bSThomas Graf static inline int nla_type(const struct nlattr *nla) 6748f4c1f9bSThomas Graf { 6758f4c1f9bSThomas Graf return nla->nla_type & NLA_TYPE_MASK; 6768f4c1f9bSThomas Graf } 6778f4c1f9bSThomas Graf 6788f4c1f9bSThomas Graf /** 679bfa83a9eSThomas Graf * nla_data - head of payload 680bfa83a9eSThomas Graf * @nla: netlink attribute 681bfa83a9eSThomas Graf */ 682bfa83a9eSThomas Graf static inline void *nla_data(const struct nlattr *nla) 683bfa83a9eSThomas Graf { 684bfa83a9eSThomas Graf return (char *) nla + NLA_HDRLEN; 685bfa83a9eSThomas Graf } 686bfa83a9eSThomas Graf 687bfa83a9eSThomas Graf /** 688bfa83a9eSThomas Graf * nla_len - length of payload 689bfa83a9eSThomas Graf * @nla: netlink attribute 690bfa83a9eSThomas Graf */ 691bfa83a9eSThomas Graf static inline int nla_len(const struct nlattr *nla) 692bfa83a9eSThomas Graf { 693bfa83a9eSThomas Graf return nla->nla_len - NLA_HDRLEN; 694bfa83a9eSThomas Graf } 695bfa83a9eSThomas Graf 696bfa83a9eSThomas Graf /** 697bfa83a9eSThomas Graf * nla_ok - check if the netlink attribute fits into the remaining bytes 698bfa83a9eSThomas Graf * @nla: netlink attribute 699bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 700bfa83a9eSThomas Graf */ 701bfa83a9eSThomas Graf static inline int nla_ok(const struct nlattr *nla, int remaining) 702bfa83a9eSThomas Graf { 703bfa83a9eSThomas Graf return remaining >= sizeof(*nla) && 704bfa83a9eSThomas Graf nla->nla_len >= sizeof(*nla) && 705bfa83a9eSThomas Graf nla->nla_len <= remaining; 706bfa83a9eSThomas Graf } 707bfa83a9eSThomas Graf 708bfa83a9eSThomas Graf /** 709d1ec3b77SPierre Ynard * nla_next - next netlink attribute in attribute stream 710bfa83a9eSThomas Graf * @nla: netlink attribute 711bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 712bfa83a9eSThomas Graf * 713bfa83a9eSThomas Graf * Returns the next netlink attribute in the attribute stream and 714bfa83a9eSThomas Graf * decrements remaining by the size of the current attribute. 715bfa83a9eSThomas Graf */ 716bfa83a9eSThomas Graf static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) 717bfa83a9eSThomas Graf { 718bfa83a9eSThomas Graf int totlen = NLA_ALIGN(nla->nla_len); 719bfa83a9eSThomas Graf 720bfa83a9eSThomas Graf *remaining -= totlen; 721bfa83a9eSThomas Graf return (struct nlattr *) ((char *) nla + totlen); 722bfa83a9eSThomas Graf } 723bfa83a9eSThomas Graf 724bfa83a9eSThomas Graf /** 725fe4944e5SThomas Graf * nla_find_nested - find attribute in a set of nested attributes 726fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 727fe4944e5SThomas Graf * @attrtype: type of attribute to look for 728fe4944e5SThomas Graf * 729fe4944e5SThomas Graf * Returns the first attribute which matches the specified type. 730fe4944e5SThomas Graf */ 731fe4944e5SThomas Graf static inline struct nlattr *nla_find_nested(struct nlattr *nla, int attrtype) 732fe4944e5SThomas Graf { 733fe4944e5SThomas Graf return nla_find(nla_data(nla), nla_len(nla), attrtype); 734fe4944e5SThomas Graf } 735fe4944e5SThomas Graf 736fe4944e5SThomas Graf /** 737bfa83a9eSThomas Graf * nla_parse_nested - parse nested attributes 738bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 739bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 740bfa83a9eSThomas Graf * @nla: attribute containing the nested attributes 741bfa83a9eSThomas Graf * @policy: validation policy 742bfa83a9eSThomas Graf * 743bfa83a9eSThomas Graf * See nla_parse() 744bfa83a9eSThomas Graf */ 745bfa83a9eSThomas Graf static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, 746bfa83a9eSThomas Graf struct nlattr *nla, 747ef7c79edSPatrick McHardy const struct nla_policy *policy) 748bfa83a9eSThomas Graf { 749bfa83a9eSThomas Graf return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy); 750bfa83a9eSThomas Graf } 7511092cb21SPatrick McHardy 7521092cb21SPatrick McHardy /** 7531092cb21SPatrick McHardy * nla_parse_nested_compat - parse nested compat attributes 7541092cb21SPatrick McHardy * @tb: destination array with maxtype+1 elements 7551092cb21SPatrick McHardy * @maxtype: maximum attribute type to be expected 7561092cb21SPatrick McHardy * @nla: attribute containing the nested attributes 7571092cb21SPatrick McHardy * @data: pointer to point to contained structure 7581092cb21SPatrick McHardy * @len: length of contained structure 7591092cb21SPatrick McHardy * @policy: validation policy 7601092cb21SPatrick McHardy * 7611092cb21SPatrick McHardy * Parse a nested compat attribute. The compat attribute contains a structure 7621092cb21SPatrick McHardy * and optionally a set of nested attributes. On success the data pointer 7631092cb21SPatrick McHardy * points to the nested data and tb contains the parsed attributes 7641092cb21SPatrick McHardy * (see nla_parse). 7651092cb21SPatrick McHardy */ 7661092cb21SPatrick McHardy static inline int __nla_parse_nested_compat(struct nlattr *tb[], int maxtype, 7671092cb21SPatrick McHardy struct nlattr *nla, 7681092cb21SPatrick McHardy const struct nla_policy *policy, 7691092cb21SPatrick McHardy int len) 7701092cb21SPatrick McHardy { 7711092cb21SPatrick McHardy if (nla_len(nla) < len) 7721092cb21SPatrick McHardy return -1; 7731092cb21SPatrick McHardy if (nla_len(nla) >= NLA_ALIGN(len) + sizeof(struct nlattr)) 7741092cb21SPatrick McHardy return nla_parse_nested(tb, maxtype, 7751092cb21SPatrick McHardy nla_data(nla) + NLA_ALIGN(len), 7761092cb21SPatrick McHardy policy); 7771092cb21SPatrick McHardy memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1)); 7781092cb21SPatrick McHardy return 0; 7791092cb21SPatrick McHardy } 7801092cb21SPatrick McHardy 7811092cb21SPatrick McHardy #define nla_parse_nested_compat(tb, maxtype, nla, policy, data, len) \ 7821092cb21SPatrick McHardy ({ data = nla_len(nla) >= len ? nla_data(nla) : NULL; \ 7831092cb21SPatrick McHardy __nla_parse_nested_compat(tb, maxtype, nla, policy, len); }) 784bfa83a9eSThomas Graf /** 785d1ec3b77SPierre Ynard * nla_put_u8 - Add a u8 netlink attribute to a socket buffer 786bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 787bfa83a9eSThomas Graf * @attrtype: attribute type 788bfa83a9eSThomas Graf * @value: numeric value 789bfa83a9eSThomas Graf */ 790bfa83a9eSThomas Graf static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) 791bfa83a9eSThomas Graf { 792bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u8), &value); 793bfa83a9eSThomas Graf } 794bfa83a9eSThomas Graf 795bfa83a9eSThomas Graf /** 796bfa83a9eSThomas Graf * nla_put_u16 - Add a u16 netlink attribute to a socket buffer 797bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 798bfa83a9eSThomas Graf * @attrtype: attribute type 799bfa83a9eSThomas Graf * @value: numeric value 800bfa83a9eSThomas Graf */ 801bfa83a9eSThomas Graf static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) 802bfa83a9eSThomas Graf { 803bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u16), &value); 804bfa83a9eSThomas Graf } 805bfa83a9eSThomas Graf 806bfa83a9eSThomas Graf /** 807bfa83a9eSThomas Graf * nla_put_u32 - Add a u32 netlink attribute to a socket buffer 808bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 809bfa83a9eSThomas Graf * @attrtype: attribute type 810bfa83a9eSThomas Graf * @value: numeric value 811bfa83a9eSThomas Graf */ 812bfa83a9eSThomas Graf static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) 813bfa83a9eSThomas Graf { 814bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u32), &value); 815bfa83a9eSThomas Graf } 816bfa83a9eSThomas Graf 817bfa83a9eSThomas Graf /** 818bfa83a9eSThomas Graf * nla_put_64 - Add a u64 netlink attribute to a socket buffer 819bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 820bfa83a9eSThomas Graf * @attrtype: attribute type 821bfa83a9eSThomas Graf * @value: numeric value 822bfa83a9eSThomas Graf */ 823bfa83a9eSThomas Graf static inline int nla_put_u64(struct sk_buff *skb, int attrtype, u64 value) 824bfa83a9eSThomas Graf { 825bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u64), &value); 826bfa83a9eSThomas Graf } 827bfa83a9eSThomas Graf 828bfa83a9eSThomas Graf /** 829bfa83a9eSThomas Graf * nla_put_string - Add a string netlink attribute to a socket buffer 830bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 831bfa83a9eSThomas Graf * @attrtype: attribute type 832bfa83a9eSThomas Graf * @str: NUL terminated string 833bfa83a9eSThomas Graf */ 834bfa83a9eSThomas Graf static inline int nla_put_string(struct sk_buff *skb, int attrtype, 835bfa83a9eSThomas Graf const char *str) 836bfa83a9eSThomas Graf { 837bfa83a9eSThomas Graf return nla_put(skb, attrtype, strlen(str) + 1, str); 838bfa83a9eSThomas Graf } 839bfa83a9eSThomas Graf 840bfa83a9eSThomas Graf /** 841bfa83a9eSThomas Graf * nla_put_flag - Add a flag netlink attribute to a socket buffer 842bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 843bfa83a9eSThomas Graf * @attrtype: attribute type 844bfa83a9eSThomas Graf */ 845bfa83a9eSThomas Graf static inline int nla_put_flag(struct sk_buff *skb, int attrtype) 846bfa83a9eSThomas Graf { 847bfa83a9eSThomas Graf return nla_put(skb, attrtype, 0, NULL); 848bfa83a9eSThomas Graf } 849bfa83a9eSThomas Graf 850bfa83a9eSThomas Graf /** 851bfa83a9eSThomas Graf * nla_put_msecs - Add a msecs netlink attribute to a socket buffer 852bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 853bfa83a9eSThomas Graf * @attrtype: attribute type 854bfa83a9eSThomas Graf * @jiffies: number of msecs in jiffies 855bfa83a9eSThomas Graf */ 856bfa83a9eSThomas Graf static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, 857bfa83a9eSThomas Graf unsigned long jiffies) 858bfa83a9eSThomas Graf { 859bfa83a9eSThomas Graf u64 tmp = jiffies_to_msecs(jiffies); 860bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u64), &tmp); 861bfa83a9eSThomas Graf } 862bfa83a9eSThomas Graf 863bfa83a9eSThomas Graf #define NLA_PUT(skb, attrtype, attrlen, data) \ 864bfa83a9eSThomas Graf do { \ 865f4d900a2SPatrick McHardy if (unlikely(nla_put(skb, attrtype, attrlen, data) < 0)) \ 866bfa83a9eSThomas Graf goto nla_put_failure; \ 867bfa83a9eSThomas Graf } while(0) 868bfa83a9eSThomas Graf 869bfa83a9eSThomas Graf #define NLA_PUT_TYPE(skb, type, attrtype, value) \ 870bfa83a9eSThomas Graf do { \ 871bfa83a9eSThomas Graf type __tmp = value; \ 872bfa83a9eSThomas Graf NLA_PUT(skb, attrtype, sizeof(type), &__tmp); \ 873bfa83a9eSThomas Graf } while(0) 874bfa83a9eSThomas Graf 875bfa83a9eSThomas Graf #define NLA_PUT_U8(skb, attrtype, value) \ 876bfa83a9eSThomas Graf NLA_PUT_TYPE(skb, u8, attrtype, value) 877bfa83a9eSThomas Graf 878bfa83a9eSThomas Graf #define NLA_PUT_U16(skb, attrtype, value) \ 879bfa83a9eSThomas Graf NLA_PUT_TYPE(skb, u16, attrtype, value) 880bfa83a9eSThomas Graf 8814a89c256SThomas Graf #define NLA_PUT_LE16(skb, attrtype, value) \ 8824a89c256SThomas Graf NLA_PUT_TYPE(skb, __le16, attrtype, value) 8834a89c256SThomas Graf 884bfa83a9eSThomas Graf #define NLA_PUT_U32(skb, attrtype, value) \ 885bfa83a9eSThomas Graf NLA_PUT_TYPE(skb, u32, attrtype, value) 886bfa83a9eSThomas Graf 88700012e5bSAl Viro #define NLA_PUT_BE32(skb, attrtype, value) \ 88800012e5bSAl Viro NLA_PUT_TYPE(skb, __be32, attrtype, value) 88900012e5bSAl Viro 890bfa83a9eSThomas Graf #define NLA_PUT_U64(skb, attrtype, value) \ 891bfa83a9eSThomas Graf NLA_PUT_TYPE(skb, u64, attrtype, value) 892bfa83a9eSThomas Graf 893bfa83a9eSThomas Graf #define NLA_PUT_STRING(skb, attrtype, value) \ 894bfa83a9eSThomas Graf NLA_PUT(skb, attrtype, strlen(value) + 1, value) 895bfa83a9eSThomas Graf 896ff5dfe73SJohannes Berg #define NLA_PUT_FLAG(skb, attrtype) \ 897bfa83a9eSThomas Graf NLA_PUT(skb, attrtype, 0, NULL) 898bfa83a9eSThomas Graf 899bfa83a9eSThomas Graf #define NLA_PUT_MSECS(skb, attrtype, jiffies) \ 900bfa83a9eSThomas Graf NLA_PUT_U64(skb, attrtype, jiffies_to_msecs(jiffies)) 901bfa83a9eSThomas Graf 902bfa83a9eSThomas Graf /** 903bfa83a9eSThomas Graf * nla_get_u32 - return payload of u32 attribute 904bfa83a9eSThomas Graf * @nla: u32 netlink attribute 905bfa83a9eSThomas Graf */ 906bfa83a9eSThomas Graf static inline u32 nla_get_u32(struct nlattr *nla) 907bfa83a9eSThomas Graf { 908bfa83a9eSThomas Graf return *(u32 *) nla_data(nla); 909bfa83a9eSThomas Graf } 910bfa83a9eSThomas Graf 911bfa83a9eSThomas Graf /** 91200012e5bSAl Viro * nla_get_be32 - return payload of __be32 attribute 91300012e5bSAl Viro * @nla: __be32 netlink attribute 91400012e5bSAl Viro */ 91500012e5bSAl Viro static inline __be32 nla_get_be32(struct nlattr *nla) 91600012e5bSAl Viro { 91700012e5bSAl Viro return *(__be32 *) nla_data(nla); 91800012e5bSAl Viro } 91900012e5bSAl Viro 92000012e5bSAl Viro /** 921bfa83a9eSThomas Graf * nla_get_u16 - return payload of u16 attribute 922bfa83a9eSThomas Graf * @nla: u16 netlink attribute 923bfa83a9eSThomas Graf */ 924bfa83a9eSThomas Graf static inline u16 nla_get_u16(struct nlattr *nla) 925bfa83a9eSThomas Graf { 926bfa83a9eSThomas Graf return *(u16 *) nla_data(nla); 927bfa83a9eSThomas Graf } 928bfa83a9eSThomas Graf 929bfa83a9eSThomas Graf /** 9304a89c256SThomas Graf * nla_get_le16 - return payload of __le16 attribute 9314a89c256SThomas Graf * @nla: __le16 netlink attribute 9324a89c256SThomas Graf */ 9334a89c256SThomas Graf static inline __le16 nla_get_le16(struct nlattr *nla) 9344a89c256SThomas Graf { 9354a89c256SThomas Graf return *(__le16 *) nla_data(nla); 9364a89c256SThomas Graf } 9374a89c256SThomas Graf 9384a89c256SThomas Graf /** 939bfa83a9eSThomas Graf * nla_get_u8 - return payload of u8 attribute 940bfa83a9eSThomas Graf * @nla: u8 netlink attribute 941bfa83a9eSThomas Graf */ 942bfa83a9eSThomas Graf static inline u8 nla_get_u8(struct nlattr *nla) 943bfa83a9eSThomas Graf { 944bfa83a9eSThomas Graf return *(u8 *) nla_data(nla); 945bfa83a9eSThomas Graf } 946bfa83a9eSThomas Graf 947bfa83a9eSThomas Graf /** 948bfa83a9eSThomas Graf * nla_get_u64 - return payload of u64 attribute 949bfa83a9eSThomas Graf * @nla: u64 netlink attribute 950bfa83a9eSThomas Graf */ 951bfa83a9eSThomas Graf static inline u64 nla_get_u64(struct nlattr *nla) 952bfa83a9eSThomas Graf { 953bfa83a9eSThomas Graf u64 tmp; 954bfa83a9eSThomas Graf 955bfa83a9eSThomas Graf nla_memcpy(&tmp, nla, sizeof(tmp)); 956bfa83a9eSThomas Graf 957bfa83a9eSThomas Graf return tmp; 958bfa83a9eSThomas Graf } 959bfa83a9eSThomas Graf 960bfa83a9eSThomas Graf /** 961bfa83a9eSThomas Graf * nla_get_flag - return payload of flag attribute 962bfa83a9eSThomas Graf * @nla: flag netlink attribute 963bfa83a9eSThomas Graf */ 964bfa83a9eSThomas Graf static inline int nla_get_flag(struct nlattr *nla) 965bfa83a9eSThomas Graf { 966bfa83a9eSThomas Graf return !!nla; 967bfa83a9eSThomas Graf } 968bfa83a9eSThomas Graf 969bfa83a9eSThomas Graf /** 970bfa83a9eSThomas Graf * nla_get_msecs - return payload of msecs attribute 971bfa83a9eSThomas Graf * @nla: msecs netlink attribute 972bfa83a9eSThomas Graf * 973bfa83a9eSThomas Graf * Returns the number of milliseconds in jiffies. 974bfa83a9eSThomas Graf */ 975bfa83a9eSThomas Graf static inline unsigned long nla_get_msecs(struct nlattr *nla) 976bfa83a9eSThomas Graf { 977bfa83a9eSThomas Graf u64 msecs = nla_get_u64(nla); 978bfa83a9eSThomas Graf 979bfa83a9eSThomas Graf return msecs_to_jiffies((unsigned long) msecs); 980bfa83a9eSThomas Graf } 981bfa83a9eSThomas Graf 982bfa83a9eSThomas Graf /** 983bfa83a9eSThomas Graf * nla_nest_start - Start a new level of nested attributes 984bfa83a9eSThomas Graf * @skb: socket buffer to add attributes to 985bfa83a9eSThomas Graf * @attrtype: attribute type of container 986bfa83a9eSThomas Graf * 987bfa83a9eSThomas Graf * Returns the container attribute 988bfa83a9eSThomas Graf */ 989bfa83a9eSThomas Graf static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) 990bfa83a9eSThomas Graf { 99127a884dcSArnaldo Carvalho de Melo struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); 992bfa83a9eSThomas Graf 993bfa83a9eSThomas Graf if (nla_put(skb, attrtype, 0, NULL) < 0) 994bfa83a9eSThomas Graf return NULL; 995bfa83a9eSThomas Graf 996bfa83a9eSThomas Graf return start; 997bfa83a9eSThomas Graf } 998bfa83a9eSThomas Graf 999bfa83a9eSThomas Graf /** 1000bfa83a9eSThomas Graf * nla_nest_end - Finalize nesting of attributes 1001d1ec3b77SPierre Ynard * @skb: socket buffer the attributes are stored in 1002bfa83a9eSThomas Graf * @start: container attribute 1003bfa83a9eSThomas Graf * 1004bfa83a9eSThomas Graf * Corrects the container attribute header to include the all 1005bfa83a9eSThomas Graf * appeneded attributes. 1006bfa83a9eSThomas Graf * 1007bfa83a9eSThomas Graf * Returns the total data length of the skb. 1008bfa83a9eSThomas Graf */ 1009bfa83a9eSThomas Graf static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) 1010bfa83a9eSThomas Graf { 101127a884dcSArnaldo Carvalho de Melo start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; 1012bfa83a9eSThomas Graf return skb->len; 1013bfa83a9eSThomas Graf } 1014bfa83a9eSThomas Graf 1015bfa83a9eSThomas Graf /** 10161092cb21SPatrick McHardy * nla_nest_compat_start - Start a new level of nested compat attributes 10171092cb21SPatrick McHardy * @skb: socket buffer to add attributes to 10181092cb21SPatrick McHardy * @attrtype: attribute type of container 10191092cb21SPatrick McHardy * @attrlen: length of structure 10201092cb21SPatrick McHardy * @data: pointer to structure 10211092cb21SPatrick McHardy * 10221092cb21SPatrick McHardy * Start a nested compat attribute that contains both a structure and 10231092cb21SPatrick McHardy * a set of nested attributes. 10241092cb21SPatrick McHardy * 10251092cb21SPatrick McHardy * Returns the container attribute 10261092cb21SPatrick McHardy */ 10271092cb21SPatrick McHardy static inline struct nlattr *nla_nest_compat_start(struct sk_buff *skb, 10281092cb21SPatrick McHardy int attrtype, int attrlen, 10291092cb21SPatrick McHardy const void *data) 10301092cb21SPatrick McHardy { 10311092cb21SPatrick McHardy struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); 10321092cb21SPatrick McHardy 10331092cb21SPatrick McHardy if (nla_put(skb, attrtype, attrlen, data) < 0) 10341092cb21SPatrick McHardy return NULL; 10351092cb21SPatrick McHardy if (nla_nest_start(skb, attrtype) == NULL) { 10361092cb21SPatrick McHardy nlmsg_trim(skb, start); 10371092cb21SPatrick McHardy return NULL; 10381092cb21SPatrick McHardy } 10391092cb21SPatrick McHardy return start; 10401092cb21SPatrick McHardy } 10411092cb21SPatrick McHardy 10421092cb21SPatrick McHardy /** 10431092cb21SPatrick McHardy * nla_nest_compat_end - Finalize nesting of compat attributes 1044d1ec3b77SPierre Ynard * @skb: socket buffer the attributes are stored in 10451092cb21SPatrick McHardy * @start: container attribute 10461092cb21SPatrick McHardy * 10471092cb21SPatrick McHardy * Corrects the container attribute header to include the all 10481092cb21SPatrick McHardy * appeneded attributes. 10491092cb21SPatrick McHardy * 10501092cb21SPatrick McHardy * Returns the total data length of the skb. 10511092cb21SPatrick McHardy */ 10521092cb21SPatrick McHardy static inline int nla_nest_compat_end(struct sk_buff *skb, struct nlattr *start) 10531092cb21SPatrick McHardy { 10541092cb21SPatrick McHardy struct nlattr *nest = (void *)start + NLMSG_ALIGN(start->nla_len); 10551092cb21SPatrick McHardy 10561092cb21SPatrick McHardy start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; 10571092cb21SPatrick McHardy return nla_nest_end(skb, nest); 10581092cb21SPatrick McHardy } 10591092cb21SPatrick McHardy 10601092cb21SPatrick McHardy /** 1061bfa83a9eSThomas Graf * nla_nest_cancel - Cancel nesting of attributes 1062bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 1063bfa83a9eSThomas Graf * @start: container attribute 1064bfa83a9eSThomas Graf * 1065bfa83a9eSThomas Graf * Removes the container attribute and including all nested 1066bfa83a9eSThomas Graf * attributes. Returns -1. 1067bfa83a9eSThomas Graf */ 1068bfa83a9eSThomas Graf static inline int nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) 1069bfa83a9eSThomas Graf { 1070fe4944e5SThomas Graf return nlmsg_trim(skb, start); 1071bfa83a9eSThomas Graf } 1072bfa83a9eSThomas Graf 1073bfa83a9eSThomas Graf /** 10744fe5d5c0SPaul Moore * nla_validate_nested - Validate a stream of nested attributes 10754fe5d5c0SPaul Moore * @start: container attribute 10764fe5d5c0SPaul Moore * @maxtype: maximum attribute type to be expected 10774fe5d5c0SPaul Moore * @policy: validation policy 10784fe5d5c0SPaul Moore * 10794fe5d5c0SPaul Moore * Validates all attributes in the nested attribute stream against the 10804fe5d5c0SPaul Moore * specified policy. Attributes with a type exceeding maxtype will be 10814fe5d5c0SPaul Moore * ignored. See documenation of struct nla_policy for more details. 10824fe5d5c0SPaul Moore * 10834fe5d5c0SPaul Moore * Returns 0 on success or a negative error code. 10844fe5d5c0SPaul Moore */ 10854fe5d5c0SPaul Moore static inline int nla_validate_nested(struct nlattr *start, int maxtype, 1086ef7c79edSPatrick McHardy const struct nla_policy *policy) 10874fe5d5c0SPaul Moore { 10884fe5d5c0SPaul Moore return nla_validate(nla_data(start), nla_len(start), maxtype, policy); 10894fe5d5c0SPaul Moore } 10904fe5d5c0SPaul Moore 10914fe5d5c0SPaul Moore /** 1092bfa83a9eSThomas Graf * nla_for_each_attr - iterate over a stream of attributes 1093bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 1094bfa83a9eSThomas Graf * @head: head of attribute stream 1095bfa83a9eSThomas Graf * @len: length of attribute stream 1096bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 1097bfa83a9eSThomas Graf */ 1098bfa83a9eSThomas Graf #define nla_for_each_attr(pos, head, len, rem) \ 1099bfa83a9eSThomas Graf for (pos = head, rem = len; \ 1100bfa83a9eSThomas Graf nla_ok(pos, rem); \ 1101bfa83a9eSThomas Graf pos = nla_next(pos, &(rem))) 1102bfa83a9eSThomas Graf 1103fe4944e5SThomas Graf /** 1104fe4944e5SThomas Graf * nla_for_each_nested - iterate over nested attributes 1105fe4944e5SThomas Graf * @pos: loop counter, set to current attribute 1106fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 1107fe4944e5SThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 1108fe4944e5SThomas Graf */ 1109fe4944e5SThomas Graf #define nla_for_each_nested(pos, nla, rem) \ 1110fe4944e5SThomas Graf nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) 1111fe4944e5SThomas Graf 1112bfa83a9eSThomas Graf #endif 1113