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() 381dc8d8c0SJustin P. Mattock * nlmsg_end() finalize 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 9401480e1cSPatrick McHardy * nla_append(skb, len, data) append data to skb 95bfa83a9eSThomas Graf * 96bfa83a9eSThomas Graf * Attribute Construction for Basic Types: 97bfa83a9eSThomas Graf * nla_put_u8(skb, type, value) add u8 attribute to skb 98bfa83a9eSThomas Graf * nla_put_u16(skb, type, value) add u16 attribute to skb 99bfa83a9eSThomas Graf * nla_put_u32(skb, type, value) add u32 attribute to skb 100bfa83a9eSThomas Graf * nla_put_u64(skb, type, value) add u64 attribute to skb 101bfa83a9eSThomas Graf * nla_put_string(skb, type, str) add string attribute to skb 102bfa83a9eSThomas Graf * nla_put_flag(skb, type) add flag attribute to skb 103bfa83a9eSThomas Graf * nla_put_msecs(skb, type, jiffies) add msecs attribute to skb 104bfa83a9eSThomas Graf * 105bfa83a9eSThomas Graf * Exceptions Based Attribute Construction: 106bfa83a9eSThomas Graf * NLA_PUT(skb, type, len, data) add attribute to skb 107bfa83a9eSThomas Graf * NLA_PUT_U8(skb, type, value) add u8 attribute to skb 108bfa83a9eSThomas Graf * NLA_PUT_U16(skb, type, value) add u16 attribute to skb 109bfa83a9eSThomas Graf * NLA_PUT_U32(skb, type, value) add u32 attribute to skb 110bfa83a9eSThomas Graf * NLA_PUT_U64(skb, type, value) add u64 attribute to skb 111bfa83a9eSThomas Graf * NLA_PUT_STRING(skb, type, str) add string attribute to skb 112bfa83a9eSThomas Graf * NLA_PUT_FLAG(skb, type) add flag attribute to skb 113bfa83a9eSThomas Graf * NLA_PUT_MSECS(skb, type, jiffies) add msecs attribute to skb 114bfa83a9eSThomas Graf * 115bfa83a9eSThomas Graf * The meaning of these functions is equal to their lower case 116bfa83a9eSThomas Graf * variants but they jump to the label nla_put_failure in case 117bfa83a9eSThomas Graf * of a failure. 118bfa83a9eSThomas Graf * 119bfa83a9eSThomas Graf * Nested Attributes Construction: 120bfa83a9eSThomas Graf * nla_nest_start(skb, type) start a nested attribute 121bfa83a9eSThomas Graf * nla_nest_end(skb, nla) finalize a nested attribute 122bfa83a9eSThomas Graf * nla_nest_cancel(skb, nla) cancel nested attribute construction 123bfa83a9eSThomas Graf * 124bfa83a9eSThomas Graf * Attribute Length Calculations: 125bfa83a9eSThomas Graf * nla_attr_size(payload) length of attribute w/o padding 126bfa83a9eSThomas Graf * nla_total_size(payload) length of attribute w/ padding 127bfa83a9eSThomas Graf * nla_padlen(payload) length of padding 128bfa83a9eSThomas Graf * 129bfa83a9eSThomas Graf * Attribute Payload Access: 130bfa83a9eSThomas Graf * nla_data(nla) head of attribute payload 131bfa83a9eSThomas Graf * nla_len(nla) length of attribute payload 132bfa83a9eSThomas Graf * 133bfa83a9eSThomas Graf * Attribute Payload Access for Basic Types: 134bfa83a9eSThomas Graf * nla_get_u8(nla) get payload for a u8 attribute 135bfa83a9eSThomas Graf * nla_get_u16(nla) get payload for a u16 attribute 136bfa83a9eSThomas Graf * nla_get_u32(nla) get payload for a u32 attribute 137bfa83a9eSThomas Graf * nla_get_u64(nla) get payload for a u64 attribute 138bfa83a9eSThomas Graf * nla_get_flag(nla) return 1 if flag is true 139bfa83a9eSThomas Graf * nla_get_msecs(nla) get payload for a msecs attribute 140bfa83a9eSThomas Graf * 141bfa83a9eSThomas Graf * Attribute Misc: 142bfa83a9eSThomas Graf * nla_memcpy(dest, nla, count) copy attribute into memory 143bfa83a9eSThomas Graf * nla_memcmp(nla, data, size) compare attribute with memory area 144bfa83a9eSThomas Graf * nla_strlcpy(dst, nla, size) copy attribute to a sized string 145bfa83a9eSThomas Graf * nla_strcmp(nla, str) compare attribute with string 146bfa83a9eSThomas Graf * 147bfa83a9eSThomas Graf * Attribute Parsing: 148bfa83a9eSThomas Graf * nla_ok(nla, remaining) does nla fit into remaining bytes? 149bfa83a9eSThomas Graf * nla_next(nla, remaining) get next netlink attribute 150bfa83a9eSThomas Graf * nla_validate() validate a stream of attributes 1514fe5d5c0SPaul Moore * nla_validate_nested() validate a stream of nested attributes 152bfa83a9eSThomas Graf * nla_find() find attribute in stream of attributes 153fe4944e5SThomas Graf * nla_find_nested() find attribute in nested attributes 154bfa83a9eSThomas Graf * nla_parse() parse and validate stream of attrs 155bfa83a9eSThomas Graf * nla_parse_nested() parse nested attribuets 156bfa83a9eSThomas Graf * nla_for_each_attr() loop over all attributes 15722acb19aSPaul Moore * nla_for_each_nested() loop over the nested attributes 158bfa83a9eSThomas Graf *========================================================================= 159bfa83a9eSThomas Graf */ 160bfa83a9eSThomas Graf 161bfa83a9eSThomas Graf /** 162bfa83a9eSThomas Graf * Standard attribute types to specify validation policy 163bfa83a9eSThomas Graf */ 164bfa83a9eSThomas Graf enum { 165bfa83a9eSThomas Graf NLA_UNSPEC, 166bfa83a9eSThomas Graf NLA_U8, 167bfa83a9eSThomas Graf NLA_U16, 168bfa83a9eSThomas Graf NLA_U32, 169bfa83a9eSThomas Graf NLA_U64, 170bfa83a9eSThomas Graf NLA_STRING, 171bfa83a9eSThomas Graf NLA_FLAG, 172bfa83a9eSThomas Graf NLA_MSECS, 173bfa83a9eSThomas Graf NLA_NESTED, 1741092cb21SPatrick McHardy NLA_NESTED_COMPAT, 175a5531a5dSThomas Graf NLA_NUL_STRING, 176d30045a0SJohannes Berg NLA_BINARY, 177bfa83a9eSThomas Graf __NLA_TYPE_MAX, 178bfa83a9eSThomas Graf }; 179bfa83a9eSThomas Graf 180bfa83a9eSThomas Graf #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) 181bfa83a9eSThomas Graf 182bfa83a9eSThomas Graf /** 183bfa83a9eSThomas Graf * struct nla_policy - attribute validation policy 184bfa83a9eSThomas Graf * @type: Type of attribute or NLA_UNSPEC 185a5531a5dSThomas Graf * @len: Type specific length of payload 186bfa83a9eSThomas Graf * 187bfa83a9eSThomas Graf * Policies are defined as arrays of this struct, the array must be 188bfa83a9eSThomas Graf * accessible by attribute type up to the highest identifier to be expected. 189bfa83a9eSThomas Graf * 190a5531a5dSThomas Graf * Meaning of `len' field: 191a5531a5dSThomas Graf * NLA_STRING Maximum length of string 192a5531a5dSThomas Graf * NLA_NUL_STRING Maximum length of string (excluding NUL) 193a5531a5dSThomas Graf * NLA_FLAG Unused 194d30045a0SJohannes Berg * NLA_BINARY Maximum length of attribute payload 1951092cb21SPatrick McHardy * NLA_NESTED_COMPAT Exact length of structure payload 196a5531a5dSThomas Graf * All other Exact length of attribute payload 197a5531a5dSThomas Graf * 198bfa83a9eSThomas Graf * Example: 199b54452b0SAlexey Dobriyan * static const struct nla_policy my_policy[ATTR_MAX+1] = { 200bfa83a9eSThomas Graf * [ATTR_FOO] = { .type = NLA_U16 }, 201d30045a0SJohannes Berg * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ }, 202a5531a5dSThomas Graf * [ATTR_BAZ] = { .len = sizeof(struct mystruct) }, 203bfa83a9eSThomas Graf * }; 204bfa83a9eSThomas Graf */ 205bfa83a9eSThomas Graf struct nla_policy { 206bfa83a9eSThomas Graf u16 type; 207a5531a5dSThomas Graf u16 len; 208bfa83a9eSThomas Graf }; 209bfa83a9eSThomas Graf 2104e902c57SThomas Graf /** 2114e902c57SThomas Graf * struct nl_info - netlink source information 2124e902c57SThomas Graf * @nlh: Netlink message header of original request 2134e902c57SThomas Graf * @pid: Netlink PID of requesting application 2144e902c57SThomas Graf */ 2154e902c57SThomas Graf struct nl_info { 2164e902c57SThomas Graf struct nlmsghdr *nlh; 2174d1169c1SDenis V. Lunev struct net *nl_net; 2184e902c57SThomas Graf u32 pid; 2194e902c57SThomas Graf }; 2204e902c57SThomas Graf 221cd40b7d3SDenis V. Lunev extern int netlink_rcv_skb(struct sk_buff *skb, 22282ace47aSThomas Graf int (*cb)(struct sk_buff *, 2231d00a4ebSThomas Graf struct nlmsghdr *)); 22497676b6bSThomas Graf extern int nlmsg_notify(struct sock *sk, struct sk_buff *skb, 22597676b6bSThomas Graf u32 pid, unsigned int group, int report, 22697676b6bSThomas Graf gfp_t flags); 22782ace47aSThomas Graf 2283654654fSJan Engelhardt extern int nla_validate(const struct nlattr *head, 2293654654fSJan Engelhardt int len, int maxtype, 230ef7c79edSPatrick McHardy const struct nla_policy *policy); 2313654654fSJan Engelhardt extern int nla_parse(struct nlattr **tb, int maxtype, 2323654654fSJan Engelhardt const struct nlattr *head, int len, 233ef7c79edSPatrick McHardy const struct nla_policy *policy); 234e487eb99SHolger Eitzenberger extern int nla_policy_len(const struct nla_policy *, int); 2353654654fSJan Engelhardt extern struct nlattr * nla_find(const struct nlattr *head, 2363654654fSJan Engelhardt int len, int attrtype); 237bfa83a9eSThomas Graf extern size_t nla_strlcpy(char *dst, const struct nlattr *nla, 238bfa83a9eSThomas Graf size_t dstsize); 239b057efd4SPatrick McHardy extern int nla_memcpy(void *dest, const struct nlattr *src, int count); 240bfa83a9eSThomas Graf extern int nla_memcmp(const struct nlattr *nla, const void *data, 241bfa83a9eSThomas Graf size_t size); 242bfa83a9eSThomas Graf extern int nla_strcmp(const struct nlattr *nla, const char *str); 243bfa83a9eSThomas Graf extern struct nlattr * __nla_reserve(struct sk_buff *skb, int attrtype, 244bfa83a9eSThomas Graf int attrlen); 245fe4944e5SThomas Graf extern void * __nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 246bfa83a9eSThomas Graf extern struct nlattr * nla_reserve(struct sk_buff *skb, int attrtype, 247bfa83a9eSThomas Graf int attrlen); 248fe4944e5SThomas Graf extern void * nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 249bfa83a9eSThomas Graf extern void __nla_put(struct sk_buff *skb, int attrtype, 250bfa83a9eSThomas Graf int attrlen, const void *data); 251fe4944e5SThomas Graf extern void __nla_put_nohdr(struct sk_buff *skb, int attrlen, 252fe4944e5SThomas Graf const void *data); 253bfa83a9eSThomas Graf extern int nla_put(struct sk_buff *skb, int attrtype, 254bfa83a9eSThomas Graf int attrlen, const void *data); 255fe4944e5SThomas Graf extern int nla_put_nohdr(struct sk_buff *skb, int attrlen, 256fe4944e5SThomas Graf const void *data); 25701480e1cSPatrick McHardy extern int nla_append(struct sk_buff *skb, int attrlen, 25801480e1cSPatrick McHardy const void *data); 259bfa83a9eSThomas Graf 260bfa83a9eSThomas Graf /************************************************************************** 261bfa83a9eSThomas Graf * Netlink Messages 262bfa83a9eSThomas Graf **************************************************************************/ 263bfa83a9eSThomas Graf 264bfa83a9eSThomas Graf /** 265bfa83a9eSThomas Graf * nlmsg_msg_size - length of netlink message not including padding 266bfa83a9eSThomas Graf * @payload: length of message payload 267bfa83a9eSThomas Graf */ 268bfa83a9eSThomas Graf static inline int nlmsg_msg_size(int payload) 269bfa83a9eSThomas Graf { 270bfa83a9eSThomas Graf return NLMSG_HDRLEN + payload; 271bfa83a9eSThomas Graf } 272bfa83a9eSThomas Graf 273bfa83a9eSThomas Graf /** 274bfa83a9eSThomas Graf * nlmsg_total_size - length of netlink message including padding 275bfa83a9eSThomas Graf * @payload: length of message payload 276bfa83a9eSThomas Graf */ 277bfa83a9eSThomas Graf static inline int nlmsg_total_size(int payload) 278bfa83a9eSThomas Graf { 279bfa83a9eSThomas Graf return NLMSG_ALIGN(nlmsg_msg_size(payload)); 280bfa83a9eSThomas Graf } 281bfa83a9eSThomas Graf 282bfa83a9eSThomas Graf /** 283bfa83a9eSThomas Graf * nlmsg_padlen - length of padding at the message's tail 284bfa83a9eSThomas Graf * @payload: length of message payload 285bfa83a9eSThomas Graf */ 286bfa83a9eSThomas Graf static inline int nlmsg_padlen(int payload) 287bfa83a9eSThomas Graf { 288bfa83a9eSThomas Graf return nlmsg_total_size(payload) - nlmsg_msg_size(payload); 289bfa83a9eSThomas Graf } 290bfa83a9eSThomas Graf 291bfa83a9eSThomas Graf /** 292bfa83a9eSThomas Graf * nlmsg_data - head of message payload 29370f23fd6SJustin P. Mattock * @nlh: netlink message header 294bfa83a9eSThomas Graf */ 295bfa83a9eSThomas Graf static inline void *nlmsg_data(const struct nlmsghdr *nlh) 296bfa83a9eSThomas Graf { 297bfa83a9eSThomas Graf return (unsigned char *) nlh + NLMSG_HDRLEN; 298bfa83a9eSThomas Graf } 299bfa83a9eSThomas Graf 300bfa83a9eSThomas Graf /** 301bfa83a9eSThomas Graf * nlmsg_len - length of message payload 302bfa83a9eSThomas Graf * @nlh: netlink message header 303bfa83a9eSThomas Graf */ 304bfa83a9eSThomas Graf static inline int nlmsg_len(const struct nlmsghdr *nlh) 305bfa83a9eSThomas Graf { 306bfa83a9eSThomas Graf return nlh->nlmsg_len - NLMSG_HDRLEN; 307bfa83a9eSThomas Graf } 308bfa83a9eSThomas Graf 309bfa83a9eSThomas Graf /** 310bfa83a9eSThomas Graf * nlmsg_attrdata - head of attributes data 311bfa83a9eSThomas Graf * @nlh: netlink message header 312bfa83a9eSThomas Graf * @hdrlen: length of family specific header 313bfa83a9eSThomas Graf */ 314bfa83a9eSThomas Graf static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, 315bfa83a9eSThomas Graf int hdrlen) 316bfa83a9eSThomas Graf { 317bfa83a9eSThomas Graf unsigned char *data = nlmsg_data(nlh); 318bfa83a9eSThomas Graf return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); 319bfa83a9eSThomas Graf } 320bfa83a9eSThomas Graf 321bfa83a9eSThomas Graf /** 322bfa83a9eSThomas Graf * nlmsg_attrlen - length of attributes data 323bfa83a9eSThomas Graf * @nlh: netlink message header 324bfa83a9eSThomas Graf * @hdrlen: length of family specific header 325bfa83a9eSThomas Graf */ 326bfa83a9eSThomas Graf static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) 327bfa83a9eSThomas Graf { 328bfa83a9eSThomas Graf return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); 329bfa83a9eSThomas Graf } 330bfa83a9eSThomas Graf 331bfa83a9eSThomas Graf /** 332bfa83a9eSThomas Graf * nlmsg_ok - check if the netlink message fits into the remaining bytes 333bfa83a9eSThomas Graf * @nlh: netlink message header 334bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 335bfa83a9eSThomas Graf */ 336bfa83a9eSThomas Graf static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) 337bfa83a9eSThomas Graf { 338619e803dSVegard Nossum return (remaining >= (int) sizeof(struct nlmsghdr) && 339bfa83a9eSThomas Graf nlh->nlmsg_len >= sizeof(struct nlmsghdr) && 340bfa83a9eSThomas Graf nlh->nlmsg_len <= remaining); 341bfa83a9eSThomas Graf } 342bfa83a9eSThomas Graf 343bfa83a9eSThomas Graf /** 344bfa83a9eSThomas Graf * nlmsg_next - next netlink message in message stream 345bfa83a9eSThomas Graf * @nlh: netlink message header 346bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 347bfa83a9eSThomas Graf * 348bfa83a9eSThomas Graf * Returns the next netlink message in the message stream and 349bfa83a9eSThomas Graf * decrements remaining by the size of the current message. 350bfa83a9eSThomas Graf */ 3513654654fSJan Engelhardt static inline struct nlmsghdr * 3523654654fSJan Engelhardt nlmsg_next(const struct nlmsghdr *nlh, int *remaining) 353bfa83a9eSThomas Graf { 354bfa83a9eSThomas Graf int totlen = NLMSG_ALIGN(nlh->nlmsg_len); 355bfa83a9eSThomas Graf 356bfa83a9eSThomas Graf *remaining -= totlen; 357bfa83a9eSThomas Graf 358bfa83a9eSThomas Graf return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); 359bfa83a9eSThomas Graf } 360bfa83a9eSThomas Graf 361bfa83a9eSThomas Graf /** 362bfa83a9eSThomas Graf * nlmsg_parse - parse attributes of a netlink message 363bfa83a9eSThomas Graf * @nlh: netlink message header 364bfa83a9eSThomas Graf * @hdrlen: length of family specific header 365bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 366bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 367bfa83a9eSThomas Graf * @policy: validation policy 368bfa83a9eSThomas Graf * 369bfa83a9eSThomas Graf * See nla_parse() 370bfa83a9eSThomas Graf */ 3713a6c2b41SPatrick McHardy static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, 372bfa83a9eSThomas Graf struct nlattr *tb[], int maxtype, 373ef7c79edSPatrick McHardy const struct nla_policy *policy) 374bfa83a9eSThomas Graf { 375bfa83a9eSThomas Graf if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) 376bfa83a9eSThomas Graf return -EINVAL; 377bfa83a9eSThomas Graf 378bfa83a9eSThomas Graf return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), 379bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), policy); 380bfa83a9eSThomas Graf } 381bfa83a9eSThomas Graf 382bfa83a9eSThomas Graf /** 383bfa83a9eSThomas Graf * nlmsg_find_attr - find a specific attribute in a netlink message 384bfa83a9eSThomas Graf * @nlh: netlink message header 385bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 386bfa83a9eSThomas Graf * @attrtype: type of attribute to look for 387bfa83a9eSThomas Graf * 388bfa83a9eSThomas Graf * Returns the first attribute which matches the specified type. 389bfa83a9eSThomas Graf */ 3906b8c92baSNelson Elhage static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, 391bfa83a9eSThomas Graf int hdrlen, int attrtype) 392bfa83a9eSThomas Graf { 393bfa83a9eSThomas Graf return nla_find(nlmsg_attrdata(nlh, hdrlen), 394bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), attrtype); 395bfa83a9eSThomas Graf } 396bfa83a9eSThomas Graf 397bfa83a9eSThomas Graf /** 398bfa83a9eSThomas Graf * nlmsg_validate - validate a netlink message including attributes 399bfa83a9eSThomas Graf * @nlh: netlinket message header 400bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 401bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 402bfa83a9eSThomas Graf * @policy: validation policy 403bfa83a9eSThomas Graf */ 4043654654fSJan Engelhardt static inline int nlmsg_validate(const struct nlmsghdr *nlh, 4053654654fSJan Engelhardt int hdrlen, int maxtype, 406ef7c79edSPatrick McHardy const struct nla_policy *policy) 407bfa83a9eSThomas Graf { 408bfa83a9eSThomas Graf if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) 409bfa83a9eSThomas Graf return -EINVAL; 410bfa83a9eSThomas Graf 411bfa83a9eSThomas Graf return nla_validate(nlmsg_attrdata(nlh, hdrlen), 412bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), maxtype, policy); 413bfa83a9eSThomas Graf } 414bfa83a9eSThomas Graf 415bfa83a9eSThomas Graf /** 41697676b6bSThomas Graf * nlmsg_report - need to report back to application? 41797676b6bSThomas Graf * @nlh: netlink message header 41897676b6bSThomas Graf * 41997676b6bSThomas Graf * Returns 1 if a report back to the application is requested. 42097676b6bSThomas Graf */ 4213a6c2b41SPatrick McHardy static inline int nlmsg_report(const struct nlmsghdr *nlh) 42297676b6bSThomas Graf { 42397676b6bSThomas Graf return !!(nlh->nlmsg_flags & NLM_F_ECHO); 42497676b6bSThomas Graf } 42597676b6bSThomas Graf 42697676b6bSThomas Graf /** 427bfa83a9eSThomas Graf * nlmsg_for_each_attr - iterate over a stream of attributes 428bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 429bfa83a9eSThomas Graf * @nlh: netlink message header 430bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 431bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 432bfa83a9eSThomas Graf */ 433bfa83a9eSThomas Graf #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ 434bfa83a9eSThomas Graf nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ 435bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), rem) 436bfa83a9eSThomas Graf 437bfa83a9eSThomas Graf #if 0 438bfa83a9eSThomas Graf /* FIXME: Enable once all users have been converted */ 439bfa83a9eSThomas Graf 440bfa83a9eSThomas Graf /** 441bfa83a9eSThomas Graf * __nlmsg_put - Add a new netlink message to an skb 442bfa83a9eSThomas Graf * @skb: socket buffer to store message in 443bfa83a9eSThomas Graf * @pid: netlink process id 444bfa83a9eSThomas Graf * @seq: sequence number of message 445bfa83a9eSThomas Graf * @type: message type 446bfa83a9eSThomas Graf * @payload: length of message payload 447bfa83a9eSThomas Graf * @flags: message flags 448bfa83a9eSThomas Graf * 449bfa83a9eSThomas Graf * The caller is responsible to ensure that the skb provides enough 450bfa83a9eSThomas Graf * tailroom for both the netlink header and payload. 451bfa83a9eSThomas Graf */ 452bfa83a9eSThomas Graf static inline struct nlmsghdr *__nlmsg_put(struct sk_buff *skb, u32 pid, 453bfa83a9eSThomas Graf u32 seq, int type, int payload, 454bfa83a9eSThomas Graf int flags) 455bfa83a9eSThomas Graf { 456bfa83a9eSThomas Graf struct nlmsghdr *nlh; 457bfa83a9eSThomas Graf 458bfa83a9eSThomas Graf nlh = (struct nlmsghdr *) skb_put(skb, nlmsg_total_size(payload)); 459bfa83a9eSThomas Graf nlh->nlmsg_type = type; 460bfa83a9eSThomas Graf nlh->nlmsg_len = nlmsg_msg_size(payload); 461bfa83a9eSThomas Graf nlh->nlmsg_flags = flags; 462bfa83a9eSThomas Graf nlh->nlmsg_pid = pid; 463bfa83a9eSThomas Graf nlh->nlmsg_seq = seq; 464bfa83a9eSThomas Graf 465bfa83a9eSThomas Graf memset((unsigned char *) nlmsg_data(nlh) + payload, 0, 466bfa83a9eSThomas Graf nlmsg_padlen(payload)); 467bfa83a9eSThomas Graf 468bfa83a9eSThomas Graf return nlh; 469bfa83a9eSThomas Graf } 470bfa83a9eSThomas Graf #endif 471bfa83a9eSThomas Graf 472bfa83a9eSThomas Graf /** 473bfa83a9eSThomas Graf * nlmsg_put - Add a new netlink message to an skb 474bfa83a9eSThomas Graf * @skb: socket buffer to store message in 475bfa83a9eSThomas Graf * @pid: netlink process id 476bfa83a9eSThomas Graf * @seq: sequence number of message 477bfa83a9eSThomas Graf * @type: message type 478bfa83a9eSThomas Graf * @payload: length of message payload 479bfa83a9eSThomas Graf * @flags: message flags 480bfa83a9eSThomas Graf * 481bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 482bfa83a9eSThomas Graf * the message header and payload. 483bfa83a9eSThomas Graf */ 484bfa83a9eSThomas Graf static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, 485bfa83a9eSThomas Graf int type, int payload, int flags) 486bfa83a9eSThomas Graf { 487bfa83a9eSThomas Graf if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) 488bfa83a9eSThomas Graf return NULL; 489bfa83a9eSThomas Graf 490bfa83a9eSThomas Graf return __nlmsg_put(skb, pid, seq, type, payload, flags); 491bfa83a9eSThomas Graf } 492bfa83a9eSThomas Graf 493bfa83a9eSThomas Graf /** 494bfa83a9eSThomas Graf * nlmsg_put_answer - Add a new callback based netlink message to an skb 495bfa83a9eSThomas Graf * @skb: socket buffer to store message in 496bfa83a9eSThomas Graf * @cb: netlink callback 497bfa83a9eSThomas Graf * @type: message type 498bfa83a9eSThomas Graf * @payload: length of message payload 499bfa83a9eSThomas Graf * @flags: message flags 500bfa83a9eSThomas Graf * 501bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 502bfa83a9eSThomas Graf * the message header and payload. 503bfa83a9eSThomas Graf */ 504bfa83a9eSThomas Graf static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, 505bfa83a9eSThomas Graf struct netlink_callback *cb, 506bfa83a9eSThomas Graf int type, int payload, 507bfa83a9eSThomas Graf int flags) 508bfa83a9eSThomas Graf { 509bfa83a9eSThomas Graf return nlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, 510bfa83a9eSThomas Graf type, payload, flags); 511bfa83a9eSThomas Graf } 512bfa83a9eSThomas Graf 513bfa83a9eSThomas Graf /** 514bfa83a9eSThomas Graf * nlmsg_new - Allocate a new netlink message 515339bf98fSThomas Graf * @payload: size of the message payload 516fe4944e5SThomas Graf * @flags: the type of memory to allocate. 517bfa83a9eSThomas Graf * 518339bf98fSThomas Graf * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known 519339bf98fSThomas Graf * and a good default is needed. 520bfa83a9eSThomas Graf */ 521339bf98fSThomas Graf static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) 522bfa83a9eSThomas Graf { 523339bf98fSThomas Graf return alloc_skb(nlmsg_total_size(payload), flags); 524bfa83a9eSThomas Graf } 525bfa83a9eSThomas Graf 526bfa83a9eSThomas Graf /** 527bfa83a9eSThomas Graf * nlmsg_end - Finalize a netlink message 528bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 529bfa83a9eSThomas Graf * @nlh: netlink message header 530bfa83a9eSThomas Graf * 531bfa83a9eSThomas Graf * Corrects the netlink message header to include the appeneded 532bfa83a9eSThomas Graf * attributes. Only necessary if attributes have been added to 533bfa83a9eSThomas Graf * the message. 534bfa83a9eSThomas Graf * 535bfa83a9eSThomas Graf * Returns the total data length of the skb. 536bfa83a9eSThomas Graf */ 537bfa83a9eSThomas Graf static inline int nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) 538bfa83a9eSThomas Graf { 53927a884dcSArnaldo Carvalho de Melo nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; 540bfa83a9eSThomas Graf 541bfa83a9eSThomas Graf return skb->len; 542bfa83a9eSThomas Graf } 543bfa83a9eSThomas Graf 544bfa83a9eSThomas Graf /** 545fe4944e5SThomas Graf * nlmsg_get_pos - return current position in netlink message 546fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 547fe4944e5SThomas Graf * 548fe4944e5SThomas Graf * Returns a pointer to the current tail of the message. 549fe4944e5SThomas Graf */ 550fe4944e5SThomas Graf static inline void *nlmsg_get_pos(struct sk_buff *skb) 551fe4944e5SThomas Graf { 55227a884dcSArnaldo Carvalho de Melo return skb_tail_pointer(skb); 553fe4944e5SThomas Graf } 554fe4944e5SThomas Graf 555fe4944e5SThomas Graf /** 556fe4944e5SThomas Graf * nlmsg_trim - Trim message to a mark 557fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 558fe4944e5SThomas Graf * @mark: mark to trim to 559fe4944e5SThomas Graf * 560bc3ed28cSThomas Graf * Trims the message to the provided mark. 561fe4944e5SThomas Graf */ 562bc3ed28cSThomas Graf static inline void nlmsg_trim(struct sk_buff *skb, const void *mark) 563fe4944e5SThomas Graf { 564fe4944e5SThomas Graf if (mark) 565fe4944e5SThomas Graf skb_trim(skb, (unsigned char *) mark - skb->data); 566fe4944e5SThomas Graf } 567fe4944e5SThomas Graf 568fe4944e5SThomas Graf /** 569bfa83a9eSThomas Graf * nlmsg_cancel - Cancel construction of a netlink message 570bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 571bfa83a9eSThomas Graf * @nlh: netlink message header 572bfa83a9eSThomas Graf * 573bfa83a9eSThomas Graf * Removes the complete netlink message including all 574bc3ed28cSThomas Graf * attributes from the socket buffer again. 575bfa83a9eSThomas Graf */ 576bc3ed28cSThomas Graf static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) 577bfa83a9eSThomas Graf { 578bc3ed28cSThomas Graf nlmsg_trim(skb, nlh); 579bfa83a9eSThomas Graf } 580bfa83a9eSThomas Graf 581bfa83a9eSThomas Graf /** 582bfa83a9eSThomas Graf * nlmsg_free - free a netlink message 583bfa83a9eSThomas Graf * @skb: socket buffer of netlink message 584bfa83a9eSThomas Graf */ 585bfa83a9eSThomas Graf static inline void nlmsg_free(struct sk_buff *skb) 586bfa83a9eSThomas Graf { 587bfa83a9eSThomas Graf kfree_skb(skb); 588bfa83a9eSThomas Graf } 589bfa83a9eSThomas Graf 590bfa83a9eSThomas Graf /** 591bfa83a9eSThomas Graf * nlmsg_multicast - multicast a netlink message 592bfa83a9eSThomas Graf * @sk: netlink socket to spread messages to 593bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 594bfa83a9eSThomas Graf * @pid: own netlink pid to avoid sending to yourself 595bfa83a9eSThomas Graf * @group: multicast group id 596d387f6adSThomas Graf * @flags: allocation flags 597bfa83a9eSThomas Graf */ 598bfa83a9eSThomas Graf static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, 599d387f6adSThomas Graf u32 pid, unsigned int group, gfp_t flags) 600bfa83a9eSThomas Graf { 601bfa83a9eSThomas Graf int err; 602bfa83a9eSThomas Graf 603bfa83a9eSThomas Graf NETLINK_CB(skb).dst_group = group; 604bfa83a9eSThomas Graf 605d387f6adSThomas Graf err = netlink_broadcast(sk, skb, pid, group, flags); 606bfa83a9eSThomas Graf if (err > 0) 607bfa83a9eSThomas Graf err = 0; 608bfa83a9eSThomas Graf 609bfa83a9eSThomas Graf return err; 610bfa83a9eSThomas Graf } 611bfa83a9eSThomas Graf 612bfa83a9eSThomas Graf /** 613bfa83a9eSThomas Graf * nlmsg_unicast - unicast a netlink message 614bfa83a9eSThomas Graf * @sk: netlink socket to spread message to 615bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 616bfa83a9eSThomas Graf * @pid: netlink pid of the destination socket 617bfa83a9eSThomas Graf */ 618bfa83a9eSThomas Graf static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 pid) 619bfa83a9eSThomas Graf { 620bfa83a9eSThomas Graf int err; 621bfa83a9eSThomas Graf 622bfa83a9eSThomas Graf err = netlink_unicast(sk, skb, pid, MSG_DONTWAIT); 623bfa83a9eSThomas Graf if (err > 0) 624bfa83a9eSThomas Graf err = 0; 625bfa83a9eSThomas Graf 626bfa83a9eSThomas Graf return err; 627bfa83a9eSThomas Graf } 628bfa83a9eSThomas Graf 629bfa83a9eSThomas Graf /** 630bfa83a9eSThomas Graf * nlmsg_for_each_msg - iterate over a stream of messages 631bfa83a9eSThomas Graf * @pos: loop counter, set to current message 632bfa83a9eSThomas Graf * @head: head of message stream 633bfa83a9eSThomas Graf * @len: length of message stream 634bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 635bfa83a9eSThomas Graf */ 636bfa83a9eSThomas Graf #define nlmsg_for_each_msg(pos, head, len, rem) \ 637bfa83a9eSThomas Graf for (pos = head, rem = len; \ 638bfa83a9eSThomas Graf nlmsg_ok(pos, rem); \ 639bfa83a9eSThomas Graf pos = nlmsg_next(pos, &(rem))) 640bfa83a9eSThomas Graf 641670dc283SJohannes Berg /** 642670dc283SJohannes Berg * nl_dump_check_consistent - check if sequence is consistent and advertise if not 643670dc283SJohannes Berg * @cb: netlink callback structure that stores the sequence number 644670dc283SJohannes Berg * @nlh: netlink message header to write the flag to 645670dc283SJohannes Berg * 646670dc283SJohannes Berg * This function checks if the sequence (generation) number changed during dump 647670dc283SJohannes Berg * and if it did, advertises it in the netlink message header. 648670dc283SJohannes Berg * 649670dc283SJohannes Berg * The correct way to use it is to set cb->seq to the generation counter when 650670dc283SJohannes Berg * all locks for dumping have been acquired, and then call this function for 651670dc283SJohannes Berg * each message that is generated. 652670dc283SJohannes Berg * 653670dc283SJohannes Berg * Note that due to initialisation concerns, 0 is an invalid sequence number 654670dc283SJohannes Berg * and must not be used by code that uses this functionality. 655670dc283SJohannes Berg */ 656670dc283SJohannes Berg static inline void 657670dc283SJohannes Berg nl_dump_check_consistent(struct netlink_callback *cb, 658670dc283SJohannes Berg struct nlmsghdr *nlh) 659670dc283SJohannes Berg { 660670dc283SJohannes Berg if (cb->prev_seq && cb->seq != cb->prev_seq) 661670dc283SJohannes Berg nlh->nlmsg_flags |= NLM_F_DUMP_INTR; 662670dc283SJohannes Berg cb->prev_seq = cb->seq; 663670dc283SJohannes Berg } 664670dc283SJohannes Berg 665bfa83a9eSThomas Graf /************************************************************************** 666bfa83a9eSThomas Graf * Netlink Attributes 667bfa83a9eSThomas Graf **************************************************************************/ 668bfa83a9eSThomas Graf 669bfa83a9eSThomas Graf /** 670bfa83a9eSThomas Graf * nla_attr_size - length of attribute not including padding 671bfa83a9eSThomas Graf * @payload: length of payload 672bfa83a9eSThomas Graf */ 673bfa83a9eSThomas Graf static inline int nla_attr_size(int payload) 674bfa83a9eSThomas Graf { 675bfa83a9eSThomas Graf return NLA_HDRLEN + payload; 676bfa83a9eSThomas Graf } 677bfa83a9eSThomas Graf 678bfa83a9eSThomas Graf /** 679bfa83a9eSThomas Graf * nla_total_size - total length of attribute including padding 680bfa83a9eSThomas Graf * @payload: length of payload 681bfa83a9eSThomas Graf */ 682bfa83a9eSThomas Graf static inline int nla_total_size(int payload) 683bfa83a9eSThomas Graf { 684bfa83a9eSThomas Graf return NLA_ALIGN(nla_attr_size(payload)); 685bfa83a9eSThomas Graf } 686bfa83a9eSThomas Graf 687bfa83a9eSThomas Graf /** 688bfa83a9eSThomas Graf * nla_padlen - length of padding at the tail of attribute 689bfa83a9eSThomas Graf * @payload: length of payload 690bfa83a9eSThomas Graf */ 691bfa83a9eSThomas Graf static inline int nla_padlen(int payload) 692bfa83a9eSThomas Graf { 693bfa83a9eSThomas Graf return nla_total_size(payload) - nla_attr_size(payload); 694bfa83a9eSThomas Graf } 695bfa83a9eSThomas Graf 696bfa83a9eSThomas Graf /** 6978f4c1f9bSThomas Graf * nla_type - attribute type 6988f4c1f9bSThomas Graf * @nla: netlink attribute 6998f4c1f9bSThomas Graf */ 7008f4c1f9bSThomas Graf static inline int nla_type(const struct nlattr *nla) 7018f4c1f9bSThomas Graf { 7028f4c1f9bSThomas Graf return nla->nla_type & NLA_TYPE_MASK; 7038f4c1f9bSThomas Graf } 7048f4c1f9bSThomas Graf 7058f4c1f9bSThomas Graf /** 706bfa83a9eSThomas Graf * nla_data - head of payload 707bfa83a9eSThomas Graf * @nla: netlink attribute 708bfa83a9eSThomas Graf */ 709bfa83a9eSThomas Graf static inline void *nla_data(const struct nlattr *nla) 710bfa83a9eSThomas Graf { 711bfa83a9eSThomas Graf return (char *) nla + NLA_HDRLEN; 712bfa83a9eSThomas Graf } 713bfa83a9eSThomas Graf 714bfa83a9eSThomas Graf /** 715bfa83a9eSThomas Graf * nla_len - length of payload 716bfa83a9eSThomas Graf * @nla: netlink attribute 717bfa83a9eSThomas Graf */ 718bfa83a9eSThomas Graf static inline int nla_len(const struct nlattr *nla) 719bfa83a9eSThomas Graf { 720bfa83a9eSThomas Graf return nla->nla_len - NLA_HDRLEN; 721bfa83a9eSThomas Graf } 722bfa83a9eSThomas Graf 723bfa83a9eSThomas Graf /** 724bfa83a9eSThomas Graf * nla_ok - check if the netlink attribute fits into the remaining bytes 725bfa83a9eSThomas Graf * @nla: netlink attribute 726bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 727bfa83a9eSThomas Graf */ 728bfa83a9eSThomas Graf static inline int nla_ok(const struct nlattr *nla, int remaining) 729bfa83a9eSThomas Graf { 7301045b03eSVegard Nossum return remaining >= (int) sizeof(*nla) && 731bfa83a9eSThomas Graf nla->nla_len >= sizeof(*nla) && 732bfa83a9eSThomas Graf nla->nla_len <= remaining; 733bfa83a9eSThomas Graf } 734bfa83a9eSThomas Graf 735bfa83a9eSThomas Graf /** 736d1ec3b77SPierre Ynard * nla_next - next netlink attribute in attribute stream 737bfa83a9eSThomas Graf * @nla: netlink attribute 738bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 739bfa83a9eSThomas Graf * 740bfa83a9eSThomas Graf * Returns the next netlink attribute in the attribute stream and 741bfa83a9eSThomas Graf * decrements remaining by the size of the current attribute. 742bfa83a9eSThomas Graf */ 743bfa83a9eSThomas Graf static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) 744bfa83a9eSThomas Graf { 745bfa83a9eSThomas Graf int totlen = NLA_ALIGN(nla->nla_len); 746bfa83a9eSThomas Graf 747bfa83a9eSThomas Graf *remaining -= totlen; 748bfa83a9eSThomas Graf return (struct nlattr *) ((char *) nla + totlen); 749bfa83a9eSThomas Graf } 750bfa83a9eSThomas Graf 751bfa83a9eSThomas Graf /** 752fe4944e5SThomas Graf * nla_find_nested - find attribute in a set of nested attributes 753fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 754fe4944e5SThomas Graf * @attrtype: type of attribute to look for 755fe4944e5SThomas Graf * 756fe4944e5SThomas Graf * Returns the first attribute which matches the specified type. 757fe4944e5SThomas Graf */ 7583654654fSJan Engelhardt static inline struct nlattr * 7593654654fSJan Engelhardt nla_find_nested(const struct nlattr *nla, int attrtype) 760fe4944e5SThomas Graf { 761fe4944e5SThomas Graf return nla_find(nla_data(nla), nla_len(nla), attrtype); 762fe4944e5SThomas Graf } 763fe4944e5SThomas Graf 764fe4944e5SThomas Graf /** 765bfa83a9eSThomas Graf * nla_parse_nested - parse nested attributes 766bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 767bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 768bfa83a9eSThomas Graf * @nla: attribute containing the nested attributes 769bfa83a9eSThomas Graf * @policy: validation policy 770bfa83a9eSThomas Graf * 771bfa83a9eSThomas Graf * See nla_parse() 772bfa83a9eSThomas Graf */ 773bfa83a9eSThomas Graf static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, 774b057efd4SPatrick McHardy const struct nlattr *nla, 775ef7c79edSPatrick McHardy const struct nla_policy *policy) 776bfa83a9eSThomas Graf { 777bfa83a9eSThomas Graf return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy); 778bfa83a9eSThomas Graf } 7791092cb21SPatrick McHardy 7801092cb21SPatrick McHardy /** 781d1ec3b77SPierre Ynard * nla_put_u8 - Add a u8 netlink attribute to a socket buffer 782bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 783bfa83a9eSThomas Graf * @attrtype: attribute type 784bfa83a9eSThomas Graf * @value: numeric value 785bfa83a9eSThomas Graf */ 786bfa83a9eSThomas Graf static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) 787bfa83a9eSThomas Graf { 788bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u8), &value); 789bfa83a9eSThomas Graf } 790bfa83a9eSThomas Graf 791bfa83a9eSThomas Graf /** 792bfa83a9eSThomas Graf * nla_put_u16 - Add a u16 netlink attribute to a socket buffer 793bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 794bfa83a9eSThomas Graf * @attrtype: attribute type 795bfa83a9eSThomas Graf * @value: numeric value 796bfa83a9eSThomas Graf */ 797bfa83a9eSThomas Graf static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) 798bfa83a9eSThomas Graf { 799bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u16), &value); 800bfa83a9eSThomas Graf } 801bfa83a9eSThomas Graf 802bfa83a9eSThomas Graf /** 803bfa83a9eSThomas Graf * nla_put_u32 - Add a u32 netlink attribute to a socket buffer 804bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 805bfa83a9eSThomas Graf * @attrtype: attribute type 806bfa83a9eSThomas Graf * @value: numeric value 807bfa83a9eSThomas Graf */ 808bfa83a9eSThomas Graf static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) 809bfa83a9eSThomas Graf { 810bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u32), &value); 811bfa83a9eSThomas Graf } 812bfa83a9eSThomas Graf 813bfa83a9eSThomas Graf /** 814bfa83a9eSThomas Graf * nla_put_64 - Add a u64 netlink attribute to a socket buffer 815bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 816bfa83a9eSThomas Graf * @attrtype: attribute type 817bfa83a9eSThomas Graf * @value: numeric value 818bfa83a9eSThomas Graf */ 819bfa83a9eSThomas Graf static inline int nla_put_u64(struct sk_buff *skb, int attrtype, u64 value) 820bfa83a9eSThomas Graf { 821bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u64), &value); 822bfa83a9eSThomas Graf } 823bfa83a9eSThomas Graf 824bfa83a9eSThomas Graf /** 825bfa83a9eSThomas Graf * nla_put_string - Add a string netlink attribute to a socket buffer 826bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 827bfa83a9eSThomas Graf * @attrtype: attribute type 828bfa83a9eSThomas Graf * @str: NUL terminated string 829bfa83a9eSThomas Graf */ 830bfa83a9eSThomas Graf static inline int nla_put_string(struct sk_buff *skb, int attrtype, 831bfa83a9eSThomas Graf const char *str) 832bfa83a9eSThomas Graf { 833bfa83a9eSThomas Graf return nla_put(skb, attrtype, strlen(str) + 1, str); 834bfa83a9eSThomas Graf } 835bfa83a9eSThomas Graf 836bfa83a9eSThomas Graf /** 837bfa83a9eSThomas Graf * nla_put_flag - Add a flag netlink attribute to a socket buffer 838bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 839bfa83a9eSThomas Graf * @attrtype: attribute type 840bfa83a9eSThomas Graf */ 841bfa83a9eSThomas Graf static inline int nla_put_flag(struct sk_buff *skb, int attrtype) 842bfa83a9eSThomas Graf { 843bfa83a9eSThomas Graf return nla_put(skb, attrtype, 0, NULL); 844bfa83a9eSThomas Graf } 845bfa83a9eSThomas Graf 846bfa83a9eSThomas Graf /** 847bfa83a9eSThomas Graf * nla_put_msecs - Add a msecs netlink attribute to a socket buffer 848bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 849bfa83a9eSThomas Graf * @attrtype: attribute type 850bfa83a9eSThomas Graf * @jiffies: number of msecs in jiffies 851bfa83a9eSThomas Graf */ 852bfa83a9eSThomas Graf static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, 853bfa83a9eSThomas Graf unsigned long jiffies) 854bfa83a9eSThomas Graf { 855bfa83a9eSThomas Graf u64 tmp = jiffies_to_msecs(jiffies); 856bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u64), &tmp); 857bfa83a9eSThomas Graf } 858bfa83a9eSThomas Graf 859bfa83a9eSThomas Graf #define NLA_PUT(skb, attrtype, attrlen, data) \ 860bfa83a9eSThomas Graf do { \ 861f4d900a2SPatrick McHardy if (unlikely(nla_put(skb, attrtype, attrlen, data) < 0)) \ 862bfa83a9eSThomas Graf goto nla_put_failure; \ 863bfa83a9eSThomas Graf } while(0) 864bfa83a9eSThomas Graf 865bfa83a9eSThomas Graf #define NLA_PUT_TYPE(skb, type, attrtype, value) \ 866bfa83a9eSThomas Graf do { \ 867bfa83a9eSThomas Graf type __tmp = value; \ 868bfa83a9eSThomas Graf NLA_PUT(skb, attrtype, sizeof(type), &__tmp); \ 869bfa83a9eSThomas Graf } while(0) 870bfa83a9eSThomas Graf 871bfa83a9eSThomas Graf #define NLA_PUT_U8(skb, attrtype, value) \ 872bfa83a9eSThomas Graf NLA_PUT_TYPE(skb, u8, attrtype, value) 873bfa83a9eSThomas Graf 874bfa83a9eSThomas Graf #define NLA_PUT_U16(skb, attrtype, value) \ 875bfa83a9eSThomas Graf NLA_PUT_TYPE(skb, u16, attrtype, value) 876bfa83a9eSThomas Graf 8774a89c256SThomas Graf #define NLA_PUT_LE16(skb, attrtype, value) \ 8784a89c256SThomas Graf NLA_PUT_TYPE(skb, __le16, attrtype, value) 8794a89c256SThomas Graf 880838965baSPatrick McHardy #define NLA_PUT_BE16(skb, attrtype, value) \ 881838965baSPatrick McHardy NLA_PUT_TYPE(skb, __be16, attrtype, value) 882838965baSPatrick McHardy 883f703651eSJozsef Kadlecsik #define NLA_PUT_NET16(skb, attrtype, value) \ 884f703651eSJozsef Kadlecsik NLA_PUT_BE16(skb, attrtype | NLA_F_NET_BYTEORDER, value) 885f703651eSJozsef Kadlecsik 886bfa83a9eSThomas Graf #define NLA_PUT_U32(skb, attrtype, value) \ 887bfa83a9eSThomas Graf NLA_PUT_TYPE(skb, u32, attrtype, value) 888bfa83a9eSThomas Graf 88900012e5bSAl Viro #define NLA_PUT_BE32(skb, attrtype, value) \ 89000012e5bSAl Viro NLA_PUT_TYPE(skb, __be32, attrtype, value) 89100012e5bSAl Viro 892f703651eSJozsef Kadlecsik #define NLA_PUT_NET32(skb, attrtype, value) \ 893f703651eSJozsef Kadlecsik NLA_PUT_BE32(skb, attrtype | NLA_F_NET_BYTEORDER, value) 894f703651eSJozsef Kadlecsik 895bfa83a9eSThomas Graf #define NLA_PUT_U64(skb, attrtype, value) \ 896bfa83a9eSThomas Graf NLA_PUT_TYPE(skb, u64, attrtype, value) 897bfa83a9eSThomas Graf 89807a7c107SKrzysztof Piotr Oledzki #define NLA_PUT_BE64(skb, attrtype, value) \ 89907a7c107SKrzysztof Piotr Oledzki NLA_PUT_TYPE(skb, __be64, attrtype, value) 90007a7c107SKrzysztof Piotr Oledzki 901f703651eSJozsef Kadlecsik #define NLA_PUT_NET64(skb, attrtype, value) \ 902f703651eSJozsef Kadlecsik NLA_PUT_BE64(skb, attrtype | NLA_F_NET_BYTEORDER, value) 903f703651eSJozsef Kadlecsik 904bfa83a9eSThomas Graf #define NLA_PUT_STRING(skb, attrtype, value) \ 905bfa83a9eSThomas Graf NLA_PUT(skb, attrtype, strlen(value) + 1, value) 906bfa83a9eSThomas Graf 907ff5dfe73SJohannes Berg #define NLA_PUT_FLAG(skb, attrtype) \ 908bfa83a9eSThomas Graf NLA_PUT(skb, attrtype, 0, NULL) 909bfa83a9eSThomas Graf 910bfa83a9eSThomas Graf #define NLA_PUT_MSECS(skb, attrtype, jiffies) \ 911bfa83a9eSThomas Graf NLA_PUT_U64(skb, attrtype, jiffies_to_msecs(jiffies)) 912bfa83a9eSThomas Graf 913bfa83a9eSThomas Graf /** 914bfa83a9eSThomas Graf * nla_get_u32 - return payload of u32 attribute 915bfa83a9eSThomas Graf * @nla: u32 netlink attribute 916bfa83a9eSThomas Graf */ 917b057efd4SPatrick McHardy static inline u32 nla_get_u32(const struct nlattr *nla) 918bfa83a9eSThomas Graf { 919bfa83a9eSThomas Graf return *(u32 *) nla_data(nla); 920bfa83a9eSThomas Graf } 921bfa83a9eSThomas Graf 922bfa83a9eSThomas Graf /** 92300012e5bSAl Viro * nla_get_be32 - return payload of __be32 attribute 92400012e5bSAl Viro * @nla: __be32 netlink attribute 92500012e5bSAl Viro */ 926b057efd4SPatrick McHardy static inline __be32 nla_get_be32(const struct nlattr *nla) 92700012e5bSAl Viro { 92800012e5bSAl Viro return *(__be32 *) nla_data(nla); 92900012e5bSAl Viro } 93000012e5bSAl Viro 93100012e5bSAl Viro /** 932bfa83a9eSThomas Graf * nla_get_u16 - return payload of u16 attribute 933bfa83a9eSThomas Graf * @nla: u16 netlink attribute 934bfa83a9eSThomas Graf */ 935b057efd4SPatrick McHardy static inline u16 nla_get_u16(const struct nlattr *nla) 936bfa83a9eSThomas Graf { 937bfa83a9eSThomas Graf return *(u16 *) nla_data(nla); 938bfa83a9eSThomas Graf } 939bfa83a9eSThomas Graf 940bfa83a9eSThomas Graf /** 941838965baSPatrick McHardy * nla_get_be16 - return payload of __be16 attribute 942838965baSPatrick McHardy * @nla: __be16 netlink attribute 943838965baSPatrick McHardy */ 944b057efd4SPatrick McHardy static inline __be16 nla_get_be16(const struct nlattr *nla) 945838965baSPatrick McHardy { 946838965baSPatrick McHardy return *(__be16 *) nla_data(nla); 947838965baSPatrick McHardy } 948838965baSPatrick McHardy 949838965baSPatrick McHardy /** 9504a89c256SThomas Graf * nla_get_le16 - return payload of __le16 attribute 9514a89c256SThomas Graf * @nla: __le16 netlink attribute 9524a89c256SThomas Graf */ 953b057efd4SPatrick McHardy static inline __le16 nla_get_le16(const struct nlattr *nla) 9544a89c256SThomas Graf { 9554a89c256SThomas Graf return *(__le16 *) nla_data(nla); 9564a89c256SThomas Graf } 9574a89c256SThomas Graf 9584a89c256SThomas Graf /** 959bfa83a9eSThomas Graf * nla_get_u8 - return payload of u8 attribute 960bfa83a9eSThomas Graf * @nla: u8 netlink attribute 961bfa83a9eSThomas Graf */ 962b057efd4SPatrick McHardy static inline u8 nla_get_u8(const struct nlattr *nla) 963bfa83a9eSThomas Graf { 964bfa83a9eSThomas Graf return *(u8 *) nla_data(nla); 965bfa83a9eSThomas Graf } 966bfa83a9eSThomas Graf 967bfa83a9eSThomas Graf /** 968bfa83a9eSThomas Graf * nla_get_u64 - return payload of u64 attribute 969bfa83a9eSThomas Graf * @nla: u64 netlink attribute 970bfa83a9eSThomas Graf */ 971b057efd4SPatrick McHardy static inline u64 nla_get_u64(const struct nlattr *nla) 972bfa83a9eSThomas Graf { 973bfa83a9eSThomas Graf u64 tmp; 974bfa83a9eSThomas Graf 975bfa83a9eSThomas Graf nla_memcpy(&tmp, nla, sizeof(tmp)); 976bfa83a9eSThomas Graf 977bfa83a9eSThomas Graf return tmp; 978bfa83a9eSThomas Graf } 979bfa83a9eSThomas Graf 980bfa83a9eSThomas Graf /** 981a17c8598SPablo Neira Ayuso * nla_get_be64 - return payload of __be64 attribute 982a17c8598SPablo Neira Ayuso * @nla: __be64 netlink attribute 983a17c8598SPablo Neira Ayuso */ 984a17c8598SPablo Neira Ayuso static inline __be64 nla_get_be64(const struct nlattr *nla) 985a17c8598SPablo Neira Ayuso { 986f5d410f2SPablo Neira Ayuso __be64 tmp; 987f5d410f2SPablo Neira Ayuso 988f5d410f2SPablo Neira Ayuso nla_memcpy(&tmp, nla, sizeof(tmp)); 989f5d410f2SPablo Neira Ayuso 990f5d410f2SPablo Neira Ayuso return tmp; 991a17c8598SPablo Neira Ayuso } 992a17c8598SPablo Neira Ayuso 993a17c8598SPablo Neira Ayuso /** 994bfa83a9eSThomas Graf * nla_get_flag - return payload of flag attribute 995bfa83a9eSThomas Graf * @nla: flag netlink attribute 996bfa83a9eSThomas Graf */ 997b057efd4SPatrick McHardy static inline int nla_get_flag(const struct nlattr *nla) 998bfa83a9eSThomas Graf { 999bfa83a9eSThomas Graf return !!nla; 1000bfa83a9eSThomas Graf } 1001bfa83a9eSThomas Graf 1002bfa83a9eSThomas Graf /** 1003bfa83a9eSThomas Graf * nla_get_msecs - return payload of msecs attribute 1004bfa83a9eSThomas Graf * @nla: msecs netlink attribute 1005bfa83a9eSThomas Graf * 1006bfa83a9eSThomas Graf * Returns the number of milliseconds in jiffies. 1007bfa83a9eSThomas Graf */ 1008b057efd4SPatrick McHardy static inline unsigned long nla_get_msecs(const struct nlattr *nla) 1009bfa83a9eSThomas Graf { 1010bfa83a9eSThomas Graf u64 msecs = nla_get_u64(nla); 1011bfa83a9eSThomas Graf 1012bfa83a9eSThomas Graf return msecs_to_jiffies((unsigned long) msecs); 1013bfa83a9eSThomas Graf } 1014bfa83a9eSThomas Graf 1015bfa83a9eSThomas Graf /** 1016bfa83a9eSThomas Graf * nla_nest_start - Start a new level of nested attributes 1017bfa83a9eSThomas Graf * @skb: socket buffer to add attributes to 1018bfa83a9eSThomas Graf * @attrtype: attribute type of container 1019bfa83a9eSThomas Graf * 1020bfa83a9eSThomas Graf * Returns the container attribute 1021bfa83a9eSThomas Graf */ 1022bfa83a9eSThomas Graf static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) 1023bfa83a9eSThomas Graf { 102427a884dcSArnaldo Carvalho de Melo struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); 1025bfa83a9eSThomas Graf 1026bfa83a9eSThomas Graf if (nla_put(skb, attrtype, 0, NULL) < 0) 1027bfa83a9eSThomas Graf return NULL; 1028bfa83a9eSThomas Graf 1029bfa83a9eSThomas Graf return start; 1030bfa83a9eSThomas Graf } 1031bfa83a9eSThomas Graf 1032bfa83a9eSThomas Graf /** 1033bfa83a9eSThomas Graf * nla_nest_end - Finalize nesting of attributes 1034d1ec3b77SPierre Ynard * @skb: socket buffer the attributes are stored in 1035bfa83a9eSThomas Graf * @start: container attribute 1036bfa83a9eSThomas Graf * 1037bfa83a9eSThomas Graf * Corrects the container attribute header to include the all 1038bfa83a9eSThomas Graf * appeneded attributes. 1039bfa83a9eSThomas Graf * 1040bfa83a9eSThomas Graf * Returns the total data length of the skb. 1041bfa83a9eSThomas Graf */ 1042bfa83a9eSThomas Graf static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) 1043bfa83a9eSThomas Graf { 104427a884dcSArnaldo Carvalho de Melo start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; 1045bfa83a9eSThomas Graf return skb->len; 1046bfa83a9eSThomas Graf } 1047bfa83a9eSThomas Graf 1048bfa83a9eSThomas Graf /** 1049bfa83a9eSThomas Graf * nla_nest_cancel - Cancel nesting of attributes 1050bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 1051bfa83a9eSThomas Graf * @start: container attribute 1052bfa83a9eSThomas Graf * 1053bfa83a9eSThomas Graf * Removes the container attribute and including all nested 1054bc3ed28cSThomas Graf * attributes. Returns -EMSGSIZE 1055bfa83a9eSThomas Graf */ 1056bc3ed28cSThomas Graf static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) 1057bfa83a9eSThomas Graf { 1058bc3ed28cSThomas Graf nlmsg_trim(skb, start); 1059bfa83a9eSThomas Graf } 1060bfa83a9eSThomas Graf 1061bfa83a9eSThomas Graf /** 10624fe5d5c0SPaul Moore * nla_validate_nested - Validate a stream of nested attributes 10634fe5d5c0SPaul Moore * @start: container attribute 10644fe5d5c0SPaul Moore * @maxtype: maximum attribute type to be expected 10654fe5d5c0SPaul Moore * @policy: validation policy 10664fe5d5c0SPaul Moore * 10674fe5d5c0SPaul Moore * Validates all attributes in the nested attribute stream against the 10684fe5d5c0SPaul Moore * specified policy. Attributes with a type exceeding maxtype will be 10694fe5d5c0SPaul Moore * ignored. See documenation of struct nla_policy for more details. 10704fe5d5c0SPaul Moore * 10714fe5d5c0SPaul Moore * Returns 0 on success or a negative error code. 10724fe5d5c0SPaul Moore */ 10733654654fSJan Engelhardt static inline int nla_validate_nested(const struct nlattr *start, int maxtype, 1074ef7c79edSPatrick McHardy const struct nla_policy *policy) 10754fe5d5c0SPaul Moore { 10764fe5d5c0SPaul Moore return nla_validate(nla_data(start), nla_len(start), maxtype, policy); 10774fe5d5c0SPaul Moore } 10784fe5d5c0SPaul Moore 10794fe5d5c0SPaul Moore /** 1080bfa83a9eSThomas Graf * nla_for_each_attr - iterate over a stream of attributes 1081bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 1082bfa83a9eSThomas Graf * @head: head of attribute stream 1083bfa83a9eSThomas Graf * @len: length of attribute stream 1084bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 1085bfa83a9eSThomas Graf */ 1086bfa83a9eSThomas Graf #define nla_for_each_attr(pos, head, len, rem) \ 1087bfa83a9eSThomas Graf for (pos = head, rem = len; \ 1088bfa83a9eSThomas Graf nla_ok(pos, rem); \ 1089bfa83a9eSThomas Graf pos = nla_next(pos, &(rem))) 1090bfa83a9eSThomas Graf 1091fe4944e5SThomas Graf /** 1092fe4944e5SThomas Graf * nla_for_each_nested - iterate over nested attributes 1093fe4944e5SThomas Graf * @pos: loop counter, set to current attribute 1094fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 1095fe4944e5SThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 1096fe4944e5SThomas Graf */ 1097fe4944e5SThomas Graf #define nla_for_each_nested(pos, nla, rem) \ 1098fe4944e5SThomas Graf nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) 1099fe4944e5SThomas Graf 1100bfa83a9eSThomas Graf #endif 1101