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> 6bfa83a9eSThomas Graf 7bfa83a9eSThomas Graf /* ======================================================================== 8bfa83a9eSThomas Graf * Netlink Messages and Attributes Interface (As Seen On TV) 9bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 10bfa83a9eSThomas Graf * Messages Interface 11bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 12bfa83a9eSThomas Graf * 13bfa83a9eSThomas Graf * Message Format: 14bfa83a9eSThomas Graf * <--- nlmsg_total_size(payload) ---> 15bfa83a9eSThomas Graf * <-- nlmsg_msg_size(payload) -> 16bfa83a9eSThomas Graf * +----------+- - -+-------------+- - -+-------- - - 17bfa83a9eSThomas Graf * | nlmsghdr | Pad | Payload | Pad | nlmsghdr 18bfa83a9eSThomas Graf * +----------+- - -+-------------+- - -+-------- - - 19bfa83a9eSThomas Graf * nlmsg_data(nlh)---^ ^ 20bfa83a9eSThomas Graf * nlmsg_next(nlh)-----------------------+ 21bfa83a9eSThomas Graf * 22bfa83a9eSThomas Graf * Payload Format: 23bfa83a9eSThomas Graf * <---------------------- nlmsg_len(nlh) ---------------------> 24bfa83a9eSThomas Graf * <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) -> 25bfa83a9eSThomas Graf * +----------------------+- - -+--------------------------------+ 26bfa83a9eSThomas Graf * | Family Header | Pad | Attributes | 27bfa83a9eSThomas Graf * +----------------------+- - -+--------------------------------+ 28bfa83a9eSThomas Graf * nlmsg_attrdata(nlh, hdrlen)---^ 29bfa83a9eSThomas Graf * 30bfa83a9eSThomas Graf * Data Structures: 31bfa83a9eSThomas Graf * struct nlmsghdr netlink message header 32bfa83a9eSThomas Graf * 33bfa83a9eSThomas Graf * Message Construction: 34bfa83a9eSThomas Graf * nlmsg_new() create a new netlink message 35bfa83a9eSThomas Graf * nlmsg_put() add a netlink message to an skb 36bfa83a9eSThomas Graf * nlmsg_put_answer() callback based nlmsg_put() 37bfa83a9eSThomas Graf * nlmsg_end() finanlize netlink message 38fe4944e5SThomas Graf * nlmsg_get_pos() return current position in message 39fe4944e5SThomas Graf * nlmsg_trim() trim part of message 40bfa83a9eSThomas Graf * nlmsg_cancel() cancel message construction 41bfa83a9eSThomas Graf * nlmsg_free() free a netlink message 42bfa83a9eSThomas Graf * 43bfa83a9eSThomas Graf * Message Sending: 44bfa83a9eSThomas Graf * nlmsg_multicast() multicast message to several groups 45bfa83a9eSThomas Graf * nlmsg_unicast() unicast a message to a single socket 46d387f6adSThomas Graf * nlmsg_notify() send notification message 47bfa83a9eSThomas Graf * 48bfa83a9eSThomas Graf * Message Length Calculations: 49bfa83a9eSThomas Graf * nlmsg_msg_size(payload) length of message w/o padding 50bfa83a9eSThomas Graf * nlmsg_total_size(payload) length of message w/ padding 51bfa83a9eSThomas Graf * nlmsg_padlen(payload) length of padding at tail 52bfa83a9eSThomas Graf * 53bfa83a9eSThomas Graf * Message Payload Access: 54bfa83a9eSThomas Graf * nlmsg_data(nlh) head of message payload 55bfa83a9eSThomas Graf * nlmsg_len(nlh) length of message payload 56bfa83a9eSThomas Graf * nlmsg_attrdata(nlh, hdrlen) head of attributes data 57bfa83a9eSThomas Graf * nlmsg_attrlen(nlh, hdrlen) length of attributes data 58bfa83a9eSThomas Graf * 59bfa83a9eSThomas Graf * Message Parsing: 60bfa83a9eSThomas Graf * nlmsg_ok(nlh, remaining) does nlh fit into remaining bytes? 61bfa83a9eSThomas Graf * nlmsg_next(nlh, remaining) get next netlink message 62bfa83a9eSThomas Graf * nlmsg_parse() parse attributes of a message 63bfa83a9eSThomas Graf * nlmsg_find_attr() find an attribute in a message 64bfa83a9eSThomas Graf * nlmsg_for_each_msg() loop over all messages 65bfa83a9eSThomas Graf * nlmsg_validate() validate netlink message incl. attrs 66bfa83a9eSThomas Graf * nlmsg_for_each_attr() loop over all attributes 67bfa83a9eSThomas Graf * 68bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 69bfa83a9eSThomas Graf * Attributes Interface 70bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 71bfa83a9eSThomas Graf * 72bfa83a9eSThomas Graf * Attribute Format: 73bfa83a9eSThomas Graf * <------- nla_total_size(payload) -------> 74bfa83a9eSThomas Graf * <---- nla_attr_size(payload) -----> 75bfa83a9eSThomas Graf * +----------+- - -+- - - - - - - - - +- - -+-------- - - 76bfa83a9eSThomas Graf * | Header | Pad | Payload | Pad | Header 77bfa83a9eSThomas Graf * +----------+- - -+- - - - - - - - - +- - -+-------- - - 78bfa83a9eSThomas Graf * <- nla_len(nla) -> ^ 79bfa83a9eSThomas Graf * nla_data(nla)----^ | 80bfa83a9eSThomas Graf * nla_next(nla)-----------------------------' 81bfa83a9eSThomas Graf * 82bfa83a9eSThomas Graf * Data Structures: 83bfa83a9eSThomas Graf * struct nlattr netlink attribtue header 84bfa83a9eSThomas Graf * 85bfa83a9eSThomas Graf * Attribute Construction: 86fe4944e5SThomas Graf * nla_reserve(skb, type, len) reserve room for an attribute 87fe4944e5SThomas Graf * nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr 88bfa83a9eSThomas Graf * nla_put(skb, type, len, data) add attribute to skb 89fe4944e5SThomas Graf * nla_put_nohdr(skb, len, data) add attribute w/o hdr 90bfa83a9eSThomas Graf * 91bfa83a9eSThomas Graf * Attribute Construction for Basic Types: 92bfa83a9eSThomas Graf * nla_put_u8(skb, type, value) add u8 attribute to skb 93bfa83a9eSThomas Graf * nla_put_u16(skb, type, value) add u16 attribute to skb 94bfa83a9eSThomas Graf * nla_put_u32(skb, type, value) add u32 attribute to skb 95bfa83a9eSThomas Graf * nla_put_u64(skb, type, value) add u64 attribute to skb 96bfa83a9eSThomas Graf * nla_put_string(skb, type, str) add string attribute to skb 97bfa83a9eSThomas Graf * nla_put_flag(skb, type) add flag attribute to skb 98bfa83a9eSThomas Graf * nla_put_msecs(skb, type, jiffies) add msecs attribute to skb 99bfa83a9eSThomas Graf * 100bfa83a9eSThomas Graf * Exceptions Based Attribute Construction: 101bfa83a9eSThomas Graf * NLA_PUT(skb, type, len, data) add attribute to skb 102bfa83a9eSThomas Graf * NLA_PUT_U8(skb, type, value) add u8 attribute to skb 103bfa83a9eSThomas Graf * NLA_PUT_U16(skb, type, value) add u16 attribute to skb 104bfa83a9eSThomas Graf * NLA_PUT_U32(skb, type, value) add u32 attribute to skb 105bfa83a9eSThomas Graf * NLA_PUT_U64(skb, type, value) add u64 attribute to skb 106bfa83a9eSThomas Graf * NLA_PUT_STRING(skb, type, str) add string attribute to skb 107bfa83a9eSThomas Graf * NLA_PUT_FLAG(skb, type) add flag attribute to skb 108bfa83a9eSThomas Graf * NLA_PUT_MSECS(skb, type, jiffies) add msecs attribute to skb 109bfa83a9eSThomas Graf * 110bfa83a9eSThomas Graf * The meaning of these functions is equal to their lower case 111bfa83a9eSThomas Graf * variants but they jump to the label nla_put_failure in case 112bfa83a9eSThomas Graf * of a failure. 113bfa83a9eSThomas Graf * 114bfa83a9eSThomas Graf * Nested Attributes Construction: 115bfa83a9eSThomas Graf * nla_nest_start(skb, type) start a nested attribute 116bfa83a9eSThomas Graf * nla_nest_end(skb, nla) finalize a nested attribute 117bfa83a9eSThomas Graf * nla_nest_cancel(skb, nla) cancel nested attribute construction 118bfa83a9eSThomas Graf * 119bfa83a9eSThomas Graf * Attribute Length Calculations: 120bfa83a9eSThomas Graf * nla_attr_size(payload) length of attribute w/o padding 121bfa83a9eSThomas Graf * nla_total_size(payload) length of attribute w/ padding 122bfa83a9eSThomas Graf * nla_padlen(payload) length of padding 123bfa83a9eSThomas Graf * 124bfa83a9eSThomas Graf * Attribute Payload Access: 125bfa83a9eSThomas Graf * nla_data(nla) head of attribute payload 126bfa83a9eSThomas Graf * nla_len(nla) length of attribute payload 127bfa83a9eSThomas Graf * 128bfa83a9eSThomas Graf * Attribute Payload Access for Basic Types: 129bfa83a9eSThomas Graf * nla_get_u8(nla) get payload for a u8 attribute 130bfa83a9eSThomas Graf * nla_get_u16(nla) get payload for a u16 attribute 131bfa83a9eSThomas Graf * nla_get_u32(nla) get payload for a u32 attribute 132bfa83a9eSThomas Graf * nla_get_u64(nla) get payload for a u64 attribute 133bfa83a9eSThomas Graf * nla_get_flag(nla) return 1 if flag is true 134bfa83a9eSThomas Graf * nla_get_msecs(nla) get payload for a msecs attribute 135bfa83a9eSThomas Graf * 136bfa83a9eSThomas Graf * Attribute Misc: 137bfa83a9eSThomas Graf * nla_memcpy(dest, nla, count) copy attribute into memory 138bfa83a9eSThomas Graf * nla_memcmp(nla, data, size) compare attribute with memory area 139bfa83a9eSThomas Graf * nla_strlcpy(dst, nla, size) copy attribute to a sized string 140bfa83a9eSThomas Graf * nla_strcmp(nla, str) compare attribute with string 141bfa83a9eSThomas Graf * 142bfa83a9eSThomas Graf * Attribute Parsing: 143bfa83a9eSThomas Graf * nla_ok(nla, remaining) does nla fit into remaining bytes? 144bfa83a9eSThomas Graf * nla_next(nla, remaining) get next netlink attribute 145bfa83a9eSThomas Graf * nla_validate() validate a stream of attributes 146bfa83a9eSThomas Graf * nla_find() find attribute in stream of attributes 147fe4944e5SThomas Graf * nla_find_nested() find attribute in nested attributes 148bfa83a9eSThomas Graf * nla_parse() parse and validate stream of attrs 149bfa83a9eSThomas Graf * nla_parse_nested() parse nested attribuets 150bfa83a9eSThomas Graf * nla_for_each_attr() loop over all attributes 151bfa83a9eSThomas Graf *========================================================================= 152bfa83a9eSThomas Graf */ 153bfa83a9eSThomas Graf 154bfa83a9eSThomas Graf /** 155bfa83a9eSThomas Graf * Standard attribute types to specify validation policy 156bfa83a9eSThomas Graf */ 157bfa83a9eSThomas Graf enum { 158bfa83a9eSThomas Graf NLA_UNSPEC, 159bfa83a9eSThomas Graf NLA_U8, 160bfa83a9eSThomas Graf NLA_U16, 161bfa83a9eSThomas Graf NLA_U32, 162bfa83a9eSThomas Graf NLA_U64, 163bfa83a9eSThomas Graf NLA_STRING, 164bfa83a9eSThomas Graf NLA_FLAG, 165bfa83a9eSThomas Graf NLA_MSECS, 166bfa83a9eSThomas Graf NLA_NESTED, 167bfa83a9eSThomas Graf __NLA_TYPE_MAX, 168bfa83a9eSThomas Graf }; 169bfa83a9eSThomas Graf 170bfa83a9eSThomas Graf #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) 171bfa83a9eSThomas Graf 172bfa83a9eSThomas Graf /** 173bfa83a9eSThomas Graf * struct nla_policy - attribute validation policy 174bfa83a9eSThomas Graf * @type: Type of attribute or NLA_UNSPEC 175bfa83a9eSThomas Graf * @minlen: Minimal length of payload required to be available 176bfa83a9eSThomas Graf * 177bfa83a9eSThomas Graf * Policies are defined as arrays of this struct, the array must be 178bfa83a9eSThomas Graf * accessible by attribute type up to the highest identifier to be expected. 179bfa83a9eSThomas Graf * 180bfa83a9eSThomas Graf * Example: 181bfa83a9eSThomas Graf * static struct nla_policy my_policy[ATTR_MAX+1] __read_mostly = { 182bfa83a9eSThomas Graf * [ATTR_FOO] = { .type = NLA_U16 }, 183bfa83a9eSThomas Graf * [ATTR_BAR] = { .type = NLA_STRING }, 184bfa83a9eSThomas Graf * [ATTR_BAZ] = { .minlen = sizeof(struct mystruct) }, 185bfa83a9eSThomas Graf * }; 186bfa83a9eSThomas Graf */ 187bfa83a9eSThomas Graf struct nla_policy { 188bfa83a9eSThomas Graf u16 type; 189bfa83a9eSThomas Graf u16 minlen; 190bfa83a9eSThomas Graf }; 191bfa83a9eSThomas Graf 19282ace47aSThomas Graf extern void netlink_run_queue(struct sock *sk, unsigned int *qlen, 19382ace47aSThomas Graf int (*cb)(struct sk_buff *, 19482ace47aSThomas Graf struct nlmsghdr *, int *)); 19582ace47aSThomas Graf extern void netlink_queue_skip(struct nlmsghdr *nlh, 19682ace47aSThomas Graf struct sk_buff *skb); 19782ace47aSThomas Graf 198bfa83a9eSThomas Graf extern int nla_validate(struct nlattr *head, int len, int maxtype, 199bfa83a9eSThomas Graf struct nla_policy *policy); 200bfa83a9eSThomas Graf extern int nla_parse(struct nlattr *tb[], int maxtype, 201bfa83a9eSThomas Graf struct nlattr *head, int len, 202bfa83a9eSThomas Graf struct nla_policy *policy); 203bfa83a9eSThomas Graf extern struct nlattr * nla_find(struct nlattr *head, int len, int attrtype); 204bfa83a9eSThomas Graf extern size_t nla_strlcpy(char *dst, const struct nlattr *nla, 205bfa83a9eSThomas Graf size_t dstsize); 206bfa83a9eSThomas Graf extern int nla_memcpy(void *dest, struct nlattr *src, int count); 207bfa83a9eSThomas Graf extern int nla_memcmp(const struct nlattr *nla, const void *data, 208bfa83a9eSThomas Graf size_t size); 209bfa83a9eSThomas Graf extern int nla_strcmp(const struct nlattr *nla, const char *str); 210bfa83a9eSThomas Graf extern struct nlattr * __nla_reserve(struct sk_buff *skb, int attrtype, 211bfa83a9eSThomas Graf int attrlen); 212fe4944e5SThomas Graf extern void * __nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 213bfa83a9eSThomas Graf extern struct nlattr * nla_reserve(struct sk_buff *skb, int attrtype, 214bfa83a9eSThomas Graf int attrlen); 215fe4944e5SThomas Graf extern void * nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 216bfa83a9eSThomas Graf extern void __nla_put(struct sk_buff *skb, int attrtype, 217bfa83a9eSThomas Graf int attrlen, const void *data); 218fe4944e5SThomas Graf extern void __nla_put_nohdr(struct sk_buff *skb, int attrlen, 219fe4944e5SThomas Graf const void *data); 220bfa83a9eSThomas Graf extern int nla_put(struct sk_buff *skb, int attrtype, 221bfa83a9eSThomas Graf int attrlen, const void *data); 222fe4944e5SThomas Graf extern int nla_put_nohdr(struct sk_buff *skb, int attrlen, 223fe4944e5SThomas Graf const void *data); 224bfa83a9eSThomas Graf 225bfa83a9eSThomas Graf /************************************************************************** 226bfa83a9eSThomas Graf * Netlink Messages 227bfa83a9eSThomas Graf **************************************************************************/ 228bfa83a9eSThomas Graf 229bfa83a9eSThomas Graf /** 230bfa83a9eSThomas Graf * nlmsg_msg_size - length of netlink message not including padding 231bfa83a9eSThomas Graf * @payload: length of message payload 232bfa83a9eSThomas Graf */ 233bfa83a9eSThomas Graf static inline int nlmsg_msg_size(int payload) 234bfa83a9eSThomas Graf { 235bfa83a9eSThomas Graf return NLMSG_HDRLEN + payload; 236bfa83a9eSThomas Graf } 237bfa83a9eSThomas Graf 238bfa83a9eSThomas Graf /** 239bfa83a9eSThomas Graf * nlmsg_total_size - length of netlink message including padding 240bfa83a9eSThomas Graf * @payload: length of message payload 241bfa83a9eSThomas Graf */ 242bfa83a9eSThomas Graf static inline int nlmsg_total_size(int payload) 243bfa83a9eSThomas Graf { 244bfa83a9eSThomas Graf return NLMSG_ALIGN(nlmsg_msg_size(payload)); 245bfa83a9eSThomas Graf } 246bfa83a9eSThomas Graf 247bfa83a9eSThomas Graf /** 248bfa83a9eSThomas Graf * nlmsg_padlen - length of padding at the message's tail 249bfa83a9eSThomas Graf * @payload: length of message payload 250bfa83a9eSThomas Graf */ 251bfa83a9eSThomas Graf static inline int nlmsg_padlen(int payload) 252bfa83a9eSThomas Graf { 253bfa83a9eSThomas Graf return nlmsg_total_size(payload) - nlmsg_msg_size(payload); 254bfa83a9eSThomas Graf } 255bfa83a9eSThomas Graf 256bfa83a9eSThomas Graf /** 257bfa83a9eSThomas Graf * nlmsg_data - head of message payload 258bfa83a9eSThomas Graf * @nlh: netlink messsage header 259bfa83a9eSThomas Graf */ 260bfa83a9eSThomas Graf static inline void *nlmsg_data(const struct nlmsghdr *nlh) 261bfa83a9eSThomas Graf { 262bfa83a9eSThomas Graf return (unsigned char *) nlh + NLMSG_HDRLEN; 263bfa83a9eSThomas Graf } 264bfa83a9eSThomas Graf 265bfa83a9eSThomas Graf /** 266bfa83a9eSThomas Graf * nlmsg_len - length of message payload 267bfa83a9eSThomas Graf * @nlh: netlink message header 268bfa83a9eSThomas Graf */ 269bfa83a9eSThomas Graf static inline int nlmsg_len(const struct nlmsghdr *nlh) 270bfa83a9eSThomas Graf { 271bfa83a9eSThomas Graf return nlh->nlmsg_len - NLMSG_HDRLEN; 272bfa83a9eSThomas Graf } 273bfa83a9eSThomas Graf 274bfa83a9eSThomas Graf /** 275bfa83a9eSThomas Graf * nlmsg_attrdata - head of attributes data 276bfa83a9eSThomas Graf * @nlh: netlink message header 277bfa83a9eSThomas Graf * @hdrlen: length of family specific header 278bfa83a9eSThomas Graf */ 279bfa83a9eSThomas Graf static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, 280bfa83a9eSThomas Graf int hdrlen) 281bfa83a9eSThomas Graf { 282bfa83a9eSThomas Graf unsigned char *data = nlmsg_data(nlh); 283bfa83a9eSThomas Graf return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); 284bfa83a9eSThomas Graf } 285bfa83a9eSThomas Graf 286bfa83a9eSThomas Graf /** 287bfa83a9eSThomas Graf * nlmsg_attrlen - length of attributes data 288bfa83a9eSThomas Graf * @nlh: netlink message header 289bfa83a9eSThomas Graf * @hdrlen: length of family specific header 290bfa83a9eSThomas Graf */ 291bfa83a9eSThomas Graf static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) 292bfa83a9eSThomas Graf { 293bfa83a9eSThomas Graf return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); 294bfa83a9eSThomas Graf } 295bfa83a9eSThomas Graf 296bfa83a9eSThomas Graf /** 297bfa83a9eSThomas Graf * nlmsg_ok - check if the netlink message fits into the remaining bytes 298bfa83a9eSThomas Graf * @nlh: netlink message header 299bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 300bfa83a9eSThomas Graf */ 301bfa83a9eSThomas Graf static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) 302bfa83a9eSThomas Graf { 303bfa83a9eSThomas Graf return (remaining >= sizeof(struct nlmsghdr) && 304bfa83a9eSThomas Graf nlh->nlmsg_len >= sizeof(struct nlmsghdr) && 305bfa83a9eSThomas Graf nlh->nlmsg_len <= remaining); 306bfa83a9eSThomas Graf } 307bfa83a9eSThomas Graf 308bfa83a9eSThomas Graf /** 309bfa83a9eSThomas Graf * nlmsg_next - next netlink message in message stream 310bfa83a9eSThomas Graf * @nlh: netlink message header 311bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 312bfa83a9eSThomas Graf * 313bfa83a9eSThomas Graf * Returns the next netlink message in the message stream and 314bfa83a9eSThomas Graf * decrements remaining by the size of the current message. 315bfa83a9eSThomas Graf */ 316bfa83a9eSThomas Graf static inline struct nlmsghdr *nlmsg_next(struct nlmsghdr *nlh, int *remaining) 317bfa83a9eSThomas Graf { 318bfa83a9eSThomas Graf int totlen = NLMSG_ALIGN(nlh->nlmsg_len); 319bfa83a9eSThomas Graf 320bfa83a9eSThomas Graf *remaining -= totlen; 321bfa83a9eSThomas Graf 322bfa83a9eSThomas Graf return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); 323bfa83a9eSThomas Graf } 324bfa83a9eSThomas Graf 325bfa83a9eSThomas Graf /** 326bfa83a9eSThomas Graf * nlmsg_parse - parse attributes of a netlink message 327bfa83a9eSThomas Graf * @nlh: netlink message header 328bfa83a9eSThomas Graf * @hdrlen: length of family specific header 329bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 330bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 331bfa83a9eSThomas Graf * @policy: validation policy 332bfa83a9eSThomas Graf * 333bfa83a9eSThomas Graf * See nla_parse() 334bfa83a9eSThomas Graf */ 335bfa83a9eSThomas Graf static inline int nlmsg_parse(struct nlmsghdr *nlh, int hdrlen, 336bfa83a9eSThomas Graf struct nlattr *tb[], int maxtype, 337bfa83a9eSThomas Graf struct nla_policy *policy) 338bfa83a9eSThomas Graf { 339bfa83a9eSThomas Graf if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) 340bfa83a9eSThomas Graf return -EINVAL; 341bfa83a9eSThomas Graf 342bfa83a9eSThomas Graf return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), 343bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), policy); 344bfa83a9eSThomas Graf } 345bfa83a9eSThomas Graf 346bfa83a9eSThomas Graf /** 347bfa83a9eSThomas Graf * nlmsg_find_attr - find a specific attribute in a netlink message 348bfa83a9eSThomas Graf * @nlh: netlink message header 349bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 350bfa83a9eSThomas Graf * @attrtype: type of attribute to look for 351bfa83a9eSThomas Graf * 352bfa83a9eSThomas Graf * Returns the first attribute which matches the specified type. 353bfa83a9eSThomas Graf */ 354bfa83a9eSThomas Graf static inline struct nlattr *nlmsg_find_attr(struct nlmsghdr *nlh, 355bfa83a9eSThomas Graf int hdrlen, int attrtype) 356bfa83a9eSThomas Graf { 357bfa83a9eSThomas Graf return nla_find(nlmsg_attrdata(nlh, hdrlen), 358bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), attrtype); 359bfa83a9eSThomas Graf } 360bfa83a9eSThomas Graf 361bfa83a9eSThomas Graf /** 362bfa83a9eSThomas Graf * nlmsg_validate - validate a netlink message including attributes 363bfa83a9eSThomas Graf * @nlh: netlinket message header 364bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 365bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 366bfa83a9eSThomas Graf * @policy: validation policy 367bfa83a9eSThomas Graf */ 368bfa83a9eSThomas Graf static inline int nlmsg_validate(struct nlmsghdr *nlh, int hdrlen, int maxtype, 369bfa83a9eSThomas Graf 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_validate(nlmsg_attrdata(nlh, hdrlen), 375bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), maxtype, policy); 376bfa83a9eSThomas Graf } 377bfa83a9eSThomas Graf 378bfa83a9eSThomas Graf /** 379bfa83a9eSThomas Graf * nlmsg_for_each_attr - iterate over a stream of attributes 380bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 381bfa83a9eSThomas Graf * @nlh: netlink message header 382bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 383bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 384bfa83a9eSThomas Graf */ 385bfa83a9eSThomas Graf #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ 386bfa83a9eSThomas Graf nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ 387bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), rem) 388bfa83a9eSThomas Graf 389bfa83a9eSThomas Graf #if 0 390bfa83a9eSThomas Graf /* FIXME: Enable once all users have been converted */ 391bfa83a9eSThomas Graf 392bfa83a9eSThomas Graf /** 393bfa83a9eSThomas Graf * __nlmsg_put - Add a new netlink message to an skb 394bfa83a9eSThomas Graf * @skb: socket buffer to store message in 395bfa83a9eSThomas Graf * @pid: netlink process id 396bfa83a9eSThomas Graf * @seq: sequence number of message 397bfa83a9eSThomas Graf * @type: message type 398bfa83a9eSThomas Graf * @payload: length of message payload 399bfa83a9eSThomas Graf * @flags: message flags 400bfa83a9eSThomas Graf * 401bfa83a9eSThomas Graf * The caller is responsible to ensure that the skb provides enough 402bfa83a9eSThomas Graf * tailroom for both the netlink header and payload. 403bfa83a9eSThomas Graf */ 404bfa83a9eSThomas Graf static inline struct nlmsghdr *__nlmsg_put(struct sk_buff *skb, u32 pid, 405bfa83a9eSThomas Graf u32 seq, int type, int payload, 406bfa83a9eSThomas Graf int flags) 407bfa83a9eSThomas Graf { 408bfa83a9eSThomas Graf struct nlmsghdr *nlh; 409bfa83a9eSThomas Graf 410bfa83a9eSThomas Graf nlh = (struct nlmsghdr *) skb_put(skb, nlmsg_total_size(payload)); 411bfa83a9eSThomas Graf nlh->nlmsg_type = type; 412bfa83a9eSThomas Graf nlh->nlmsg_len = nlmsg_msg_size(payload); 413bfa83a9eSThomas Graf nlh->nlmsg_flags = flags; 414bfa83a9eSThomas Graf nlh->nlmsg_pid = pid; 415bfa83a9eSThomas Graf nlh->nlmsg_seq = seq; 416bfa83a9eSThomas Graf 417bfa83a9eSThomas Graf memset((unsigned char *) nlmsg_data(nlh) + payload, 0, 418bfa83a9eSThomas Graf nlmsg_padlen(payload)); 419bfa83a9eSThomas Graf 420bfa83a9eSThomas Graf return nlh; 421bfa83a9eSThomas Graf } 422bfa83a9eSThomas Graf #endif 423bfa83a9eSThomas Graf 424bfa83a9eSThomas Graf /** 425bfa83a9eSThomas Graf * nlmsg_put - Add a new netlink message to an skb 426bfa83a9eSThomas Graf * @skb: socket buffer to store message in 427bfa83a9eSThomas Graf * @pid: netlink process id 428bfa83a9eSThomas Graf * @seq: sequence number of message 429bfa83a9eSThomas Graf * @type: message type 430bfa83a9eSThomas Graf * @payload: length of message payload 431bfa83a9eSThomas Graf * @flags: message flags 432bfa83a9eSThomas Graf * 433bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 434bfa83a9eSThomas Graf * the message header and payload. 435bfa83a9eSThomas Graf */ 436bfa83a9eSThomas Graf static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, 437bfa83a9eSThomas Graf int type, int payload, int flags) 438bfa83a9eSThomas Graf { 439bfa83a9eSThomas Graf if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) 440bfa83a9eSThomas Graf return NULL; 441bfa83a9eSThomas Graf 442bfa83a9eSThomas Graf return __nlmsg_put(skb, pid, seq, type, payload, flags); 443bfa83a9eSThomas Graf } 444bfa83a9eSThomas Graf 445bfa83a9eSThomas Graf /** 446bfa83a9eSThomas Graf * nlmsg_put_answer - Add a new callback based netlink message to an skb 447bfa83a9eSThomas Graf * @skb: socket buffer to store message in 448bfa83a9eSThomas Graf * @cb: netlink callback 449bfa83a9eSThomas Graf * @type: message type 450bfa83a9eSThomas Graf * @payload: length of message payload 451bfa83a9eSThomas Graf * @flags: message flags 452bfa83a9eSThomas Graf * 453bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 454bfa83a9eSThomas Graf * the message header and payload. 455bfa83a9eSThomas Graf */ 456bfa83a9eSThomas Graf static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, 457bfa83a9eSThomas Graf struct netlink_callback *cb, 458bfa83a9eSThomas Graf int type, int payload, 459bfa83a9eSThomas Graf int flags) 460bfa83a9eSThomas Graf { 461bfa83a9eSThomas Graf return nlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, 462bfa83a9eSThomas Graf type, payload, flags); 463bfa83a9eSThomas Graf } 464bfa83a9eSThomas Graf 465bfa83a9eSThomas Graf /** 466bfa83a9eSThomas Graf * nlmsg_new - Allocate a new netlink message 467bfa83a9eSThomas Graf * @size: maximum size of message 468fe4944e5SThomas Graf * @flags: the type of memory to allocate. 469bfa83a9eSThomas Graf * 470bfa83a9eSThomas Graf * Use NLMSG_GOODSIZE if size isn't know and you need a good default size. 471bfa83a9eSThomas Graf */ 472fe4944e5SThomas Graf static inline struct sk_buff *nlmsg_new(int size, gfp_t flags) 473bfa83a9eSThomas Graf { 474fe4944e5SThomas Graf return alloc_skb(size, flags); 475bfa83a9eSThomas Graf } 476bfa83a9eSThomas Graf 477bfa83a9eSThomas Graf /** 478bfa83a9eSThomas Graf * nlmsg_end - Finalize a netlink message 479bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 480bfa83a9eSThomas Graf * @nlh: netlink message header 481bfa83a9eSThomas Graf * 482bfa83a9eSThomas Graf * Corrects the netlink message header to include the appeneded 483bfa83a9eSThomas Graf * attributes. Only necessary if attributes have been added to 484bfa83a9eSThomas Graf * the message. 485bfa83a9eSThomas Graf * 486bfa83a9eSThomas Graf * Returns the total data length of the skb. 487bfa83a9eSThomas Graf */ 488bfa83a9eSThomas Graf static inline int nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) 489bfa83a9eSThomas Graf { 490bfa83a9eSThomas Graf nlh->nlmsg_len = skb->tail - (unsigned char *) nlh; 491bfa83a9eSThomas Graf 492bfa83a9eSThomas Graf return skb->len; 493bfa83a9eSThomas Graf } 494bfa83a9eSThomas Graf 495bfa83a9eSThomas Graf /** 496fe4944e5SThomas Graf * nlmsg_get_pos - return current position in netlink message 497fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 498fe4944e5SThomas Graf * 499fe4944e5SThomas Graf * Returns a pointer to the current tail of the message. 500fe4944e5SThomas Graf */ 501fe4944e5SThomas Graf static inline void *nlmsg_get_pos(struct sk_buff *skb) 502fe4944e5SThomas Graf { 503fe4944e5SThomas Graf return skb->tail; 504fe4944e5SThomas Graf } 505fe4944e5SThomas Graf 506fe4944e5SThomas Graf /** 507fe4944e5SThomas Graf * nlmsg_trim - Trim message to a mark 508fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 509fe4944e5SThomas Graf * @mark: mark to trim to 510fe4944e5SThomas Graf * 511fe4944e5SThomas Graf * Trims the message to the provided mark. Returns -1. 512fe4944e5SThomas Graf */ 513fe4944e5SThomas Graf static inline int nlmsg_trim(struct sk_buff *skb, void *mark) 514fe4944e5SThomas Graf { 515fe4944e5SThomas Graf if (mark) 516fe4944e5SThomas Graf skb_trim(skb, (unsigned char *) mark - skb->data); 517fe4944e5SThomas Graf 518fe4944e5SThomas Graf return -1; 519fe4944e5SThomas Graf } 520fe4944e5SThomas Graf 521fe4944e5SThomas Graf /** 522bfa83a9eSThomas Graf * nlmsg_cancel - Cancel construction of a netlink message 523bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 524bfa83a9eSThomas Graf * @nlh: netlink message header 525bfa83a9eSThomas Graf * 526bfa83a9eSThomas Graf * Removes the complete netlink message including all 527bfa83a9eSThomas Graf * attributes from the socket buffer again. Returns -1. 528bfa83a9eSThomas Graf */ 529bfa83a9eSThomas Graf static inline int nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) 530bfa83a9eSThomas Graf { 531fe4944e5SThomas Graf return nlmsg_trim(skb, nlh); 532bfa83a9eSThomas Graf } 533bfa83a9eSThomas Graf 534bfa83a9eSThomas Graf /** 535bfa83a9eSThomas Graf * nlmsg_free - free a netlink message 536bfa83a9eSThomas Graf * @skb: socket buffer of netlink message 537bfa83a9eSThomas Graf */ 538bfa83a9eSThomas Graf static inline void nlmsg_free(struct sk_buff *skb) 539bfa83a9eSThomas Graf { 540bfa83a9eSThomas Graf kfree_skb(skb); 541bfa83a9eSThomas Graf } 542bfa83a9eSThomas Graf 543bfa83a9eSThomas Graf /** 544bfa83a9eSThomas Graf * nlmsg_multicast - multicast a netlink message 545bfa83a9eSThomas Graf * @sk: netlink socket to spread messages to 546bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 547bfa83a9eSThomas Graf * @pid: own netlink pid to avoid sending to yourself 548bfa83a9eSThomas Graf * @group: multicast group id 549d387f6adSThomas Graf * @flags: allocation flags 550bfa83a9eSThomas Graf */ 551bfa83a9eSThomas Graf static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, 552d387f6adSThomas Graf u32 pid, unsigned int group, gfp_t flags) 553bfa83a9eSThomas Graf { 554bfa83a9eSThomas Graf int err; 555bfa83a9eSThomas Graf 556bfa83a9eSThomas Graf NETLINK_CB(skb).dst_group = group; 557bfa83a9eSThomas Graf 558d387f6adSThomas Graf err = netlink_broadcast(sk, skb, pid, group, flags); 559bfa83a9eSThomas Graf if (err > 0) 560bfa83a9eSThomas Graf err = 0; 561bfa83a9eSThomas Graf 562bfa83a9eSThomas Graf return err; 563bfa83a9eSThomas Graf } 564bfa83a9eSThomas Graf 565bfa83a9eSThomas Graf /** 566bfa83a9eSThomas Graf * nlmsg_unicast - unicast a netlink message 567bfa83a9eSThomas Graf * @sk: netlink socket to spread message to 568bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 569bfa83a9eSThomas Graf * @pid: netlink pid of the destination socket 570bfa83a9eSThomas Graf */ 571bfa83a9eSThomas Graf static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 pid) 572bfa83a9eSThomas Graf { 573bfa83a9eSThomas Graf int err; 574bfa83a9eSThomas Graf 575bfa83a9eSThomas Graf err = netlink_unicast(sk, skb, pid, MSG_DONTWAIT); 576bfa83a9eSThomas Graf if (err > 0) 577bfa83a9eSThomas Graf err = 0; 578bfa83a9eSThomas Graf 579bfa83a9eSThomas Graf return err; 580bfa83a9eSThomas Graf } 581bfa83a9eSThomas Graf 582bfa83a9eSThomas Graf /** 583bfa83a9eSThomas Graf * nlmsg_for_each_msg - iterate over a stream of messages 584bfa83a9eSThomas Graf * @pos: loop counter, set to current message 585bfa83a9eSThomas Graf * @head: head of message stream 586bfa83a9eSThomas Graf * @len: length of message stream 587bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 588bfa83a9eSThomas Graf */ 589bfa83a9eSThomas Graf #define nlmsg_for_each_msg(pos, head, len, rem) \ 590bfa83a9eSThomas Graf for (pos = head, rem = len; \ 591bfa83a9eSThomas Graf nlmsg_ok(pos, rem); \ 592bfa83a9eSThomas Graf pos = nlmsg_next(pos, &(rem))) 593bfa83a9eSThomas Graf 594bfa83a9eSThomas Graf /************************************************************************** 595bfa83a9eSThomas Graf * Netlink Attributes 596bfa83a9eSThomas Graf **************************************************************************/ 597bfa83a9eSThomas Graf 598bfa83a9eSThomas Graf /** 599bfa83a9eSThomas Graf * nla_attr_size - length of attribute not including padding 600bfa83a9eSThomas Graf * @payload: length of payload 601bfa83a9eSThomas Graf */ 602bfa83a9eSThomas Graf static inline int nla_attr_size(int payload) 603bfa83a9eSThomas Graf { 604bfa83a9eSThomas Graf return NLA_HDRLEN + payload; 605bfa83a9eSThomas Graf } 606bfa83a9eSThomas Graf 607bfa83a9eSThomas Graf /** 608bfa83a9eSThomas Graf * nla_total_size - total length of attribute including padding 609bfa83a9eSThomas Graf * @payload: length of payload 610bfa83a9eSThomas Graf */ 611bfa83a9eSThomas Graf static inline int nla_total_size(int payload) 612bfa83a9eSThomas Graf { 613bfa83a9eSThomas Graf return NLA_ALIGN(nla_attr_size(payload)); 614bfa83a9eSThomas Graf } 615bfa83a9eSThomas Graf 616bfa83a9eSThomas Graf /** 617bfa83a9eSThomas Graf * nla_padlen - length of padding at the tail of attribute 618bfa83a9eSThomas Graf * @payload: length of payload 619bfa83a9eSThomas Graf */ 620bfa83a9eSThomas Graf static inline int nla_padlen(int payload) 621bfa83a9eSThomas Graf { 622bfa83a9eSThomas Graf return nla_total_size(payload) - nla_attr_size(payload); 623bfa83a9eSThomas Graf } 624bfa83a9eSThomas Graf 625bfa83a9eSThomas Graf /** 626bfa83a9eSThomas Graf * nla_data - head of payload 627bfa83a9eSThomas Graf * @nla: netlink attribute 628bfa83a9eSThomas Graf */ 629bfa83a9eSThomas Graf static inline void *nla_data(const struct nlattr *nla) 630bfa83a9eSThomas Graf { 631bfa83a9eSThomas Graf return (char *) nla + NLA_HDRLEN; 632bfa83a9eSThomas Graf } 633bfa83a9eSThomas Graf 634bfa83a9eSThomas Graf /** 635bfa83a9eSThomas Graf * nla_len - length of payload 636bfa83a9eSThomas Graf * @nla: netlink attribute 637bfa83a9eSThomas Graf */ 638bfa83a9eSThomas Graf static inline int nla_len(const struct nlattr *nla) 639bfa83a9eSThomas Graf { 640bfa83a9eSThomas Graf return nla->nla_len - NLA_HDRLEN; 641bfa83a9eSThomas Graf } 642bfa83a9eSThomas Graf 643bfa83a9eSThomas Graf /** 644bfa83a9eSThomas Graf * nla_ok - check if the netlink attribute fits into the remaining bytes 645bfa83a9eSThomas Graf * @nla: netlink attribute 646bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 647bfa83a9eSThomas Graf */ 648bfa83a9eSThomas Graf static inline int nla_ok(const struct nlattr *nla, int remaining) 649bfa83a9eSThomas Graf { 650bfa83a9eSThomas Graf return remaining >= sizeof(*nla) && 651bfa83a9eSThomas Graf nla->nla_len >= sizeof(*nla) && 652bfa83a9eSThomas Graf nla->nla_len <= remaining; 653bfa83a9eSThomas Graf } 654bfa83a9eSThomas Graf 655bfa83a9eSThomas Graf /** 656bfa83a9eSThomas Graf * nla_next - next netlink attribte in attribute stream 657bfa83a9eSThomas Graf * @nla: netlink attribute 658bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 659bfa83a9eSThomas Graf * 660bfa83a9eSThomas Graf * Returns the next netlink attribute in the attribute stream and 661bfa83a9eSThomas Graf * decrements remaining by the size of the current attribute. 662bfa83a9eSThomas Graf */ 663bfa83a9eSThomas Graf static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) 664bfa83a9eSThomas Graf { 665bfa83a9eSThomas Graf int totlen = NLA_ALIGN(nla->nla_len); 666bfa83a9eSThomas Graf 667bfa83a9eSThomas Graf *remaining -= totlen; 668bfa83a9eSThomas Graf return (struct nlattr *) ((char *) nla + totlen); 669bfa83a9eSThomas Graf } 670bfa83a9eSThomas Graf 671bfa83a9eSThomas Graf /** 672fe4944e5SThomas Graf * nla_find_nested - find attribute in a set of nested attributes 673fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 674fe4944e5SThomas Graf * @attrtype: type of attribute to look for 675fe4944e5SThomas Graf * 676fe4944e5SThomas Graf * Returns the first attribute which matches the specified type. 677fe4944e5SThomas Graf */ 678fe4944e5SThomas Graf static inline struct nlattr *nla_find_nested(struct nlattr *nla, int attrtype) 679fe4944e5SThomas Graf { 680fe4944e5SThomas Graf return nla_find(nla_data(nla), nla_len(nla), attrtype); 681fe4944e5SThomas Graf } 682fe4944e5SThomas Graf 683fe4944e5SThomas Graf /** 684bfa83a9eSThomas Graf * nla_parse_nested - parse nested attributes 685bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 686bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 687bfa83a9eSThomas Graf * @nla: attribute containing the nested attributes 688bfa83a9eSThomas Graf * @policy: validation policy 689bfa83a9eSThomas Graf * 690bfa83a9eSThomas Graf * See nla_parse() 691bfa83a9eSThomas Graf */ 692bfa83a9eSThomas Graf static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, 693bfa83a9eSThomas Graf struct nlattr *nla, 694bfa83a9eSThomas Graf struct nla_policy *policy) 695bfa83a9eSThomas Graf { 696bfa83a9eSThomas Graf return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy); 697bfa83a9eSThomas Graf } 698bfa83a9eSThomas Graf /** 699bfa83a9eSThomas Graf * nla_put_u8 - Add a u16 netlink attribute to a socket buffer 700bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 701bfa83a9eSThomas Graf * @attrtype: attribute type 702bfa83a9eSThomas Graf * @value: numeric value 703bfa83a9eSThomas Graf */ 704bfa83a9eSThomas Graf static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) 705bfa83a9eSThomas Graf { 706bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u8), &value); 707bfa83a9eSThomas Graf } 708bfa83a9eSThomas Graf 709bfa83a9eSThomas Graf /** 710bfa83a9eSThomas Graf * nla_put_u16 - Add a u16 netlink attribute to a socket buffer 711bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 712bfa83a9eSThomas Graf * @attrtype: attribute type 713bfa83a9eSThomas Graf * @value: numeric value 714bfa83a9eSThomas Graf */ 715bfa83a9eSThomas Graf static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) 716bfa83a9eSThomas Graf { 717bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u16), &value); 718bfa83a9eSThomas Graf } 719bfa83a9eSThomas Graf 720bfa83a9eSThomas Graf /** 721bfa83a9eSThomas Graf * nla_put_u32 - Add a u32 netlink attribute to a socket buffer 722bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 723bfa83a9eSThomas Graf * @attrtype: attribute type 724bfa83a9eSThomas Graf * @value: numeric value 725bfa83a9eSThomas Graf */ 726bfa83a9eSThomas Graf static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) 727bfa83a9eSThomas Graf { 728bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u32), &value); 729bfa83a9eSThomas Graf } 730bfa83a9eSThomas Graf 731bfa83a9eSThomas Graf /** 732bfa83a9eSThomas Graf * nla_put_64 - Add a u64 netlink attribute to a socket buffer 733bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 734bfa83a9eSThomas Graf * @attrtype: attribute type 735bfa83a9eSThomas Graf * @value: numeric value 736bfa83a9eSThomas Graf */ 737bfa83a9eSThomas Graf static inline int nla_put_u64(struct sk_buff *skb, int attrtype, u64 value) 738bfa83a9eSThomas Graf { 739bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u64), &value); 740bfa83a9eSThomas Graf } 741bfa83a9eSThomas Graf 742bfa83a9eSThomas Graf /** 743bfa83a9eSThomas Graf * nla_put_string - Add a string netlink attribute to a socket buffer 744bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 745bfa83a9eSThomas Graf * @attrtype: attribute type 746bfa83a9eSThomas Graf * @str: NUL terminated string 747bfa83a9eSThomas Graf */ 748bfa83a9eSThomas Graf static inline int nla_put_string(struct sk_buff *skb, int attrtype, 749bfa83a9eSThomas Graf const char *str) 750bfa83a9eSThomas Graf { 751bfa83a9eSThomas Graf return nla_put(skb, attrtype, strlen(str) + 1, str); 752bfa83a9eSThomas Graf } 753bfa83a9eSThomas Graf 754bfa83a9eSThomas Graf /** 755bfa83a9eSThomas Graf * nla_put_flag - Add a flag netlink attribute to a socket buffer 756bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 757bfa83a9eSThomas Graf * @attrtype: attribute type 758bfa83a9eSThomas Graf */ 759bfa83a9eSThomas Graf static inline int nla_put_flag(struct sk_buff *skb, int attrtype) 760bfa83a9eSThomas Graf { 761bfa83a9eSThomas Graf return nla_put(skb, attrtype, 0, NULL); 762bfa83a9eSThomas Graf } 763bfa83a9eSThomas Graf 764bfa83a9eSThomas Graf /** 765bfa83a9eSThomas Graf * nla_put_msecs - Add a msecs netlink attribute to a socket buffer 766bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 767bfa83a9eSThomas Graf * @attrtype: attribute type 768bfa83a9eSThomas Graf * @jiffies: number of msecs in jiffies 769bfa83a9eSThomas Graf */ 770bfa83a9eSThomas Graf static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, 771bfa83a9eSThomas Graf unsigned long jiffies) 772bfa83a9eSThomas Graf { 773bfa83a9eSThomas Graf u64 tmp = jiffies_to_msecs(jiffies); 774bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u64), &tmp); 775bfa83a9eSThomas Graf } 776bfa83a9eSThomas Graf 777bfa83a9eSThomas Graf #define NLA_PUT(skb, attrtype, attrlen, data) \ 778bfa83a9eSThomas Graf do { \ 779bfa83a9eSThomas Graf if (nla_put(skb, attrtype, attrlen, data) < 0) \ 780bfa83a9eSThomas Graf goto nla_put_failure; \ 781bfa83a9eSThomas Graf } while(0) 782bfa83a9eSThomas Graf 783bfa83a9eSThomas Graf #define NLA_PUT_TYPE(skb, type, attrtype, value) \ 784bfa83a9eSThomas Graf do { \ 785bfa83a9eSThomas Graf type __tmp = value; \ 786bfa83a9eSThomas Graf NLA_PUT(skb, attrtype, sizeof(type), &__tmp); \ 787bfa83a9eSThomas Graf } while(0) 788bfa83a9eSThomas Graf 789bfa83a9eSThomas Graf #define NLA_PUT_U8(skb, attrtype, value) \ 790bfa83a9eSThomas Graf NLA_PUT_TYPE(skb, u8, attrtype, value) 791bfa83a9eSThomas Graf 792bfa83a9eSThomas Graf #define NLA_PUT_U16(skb, attrtype, value) \ 793bfa83a9eSThomas Graf NLA_PUT_TYPE(skb, u16, attrtype, value) 794bfa83a9eSThomas Graf 795bfa83a9eSThomas Graf #define NLA_PUT_U32(skb, attrtype, value) \ 796bfa83a9eSThomas Graf NLA_PUT_TYPE(skb, u32, attrtype, value) 797bfa83a9eSThomas Graf 798bfa83a9eSThomas Graf #define NLA_PUT_U64(skb, attrtype, value) \ 799bfa83a9eSThomas Graf NLA_PUT_TYPE(skb, u64, attrtype, value) 800bfa83a9eSThomas Graf 801bfa83a9eSThomas Graf #define NLA_PUT_STRING(skb, attrtype, value) \ 802bfa83a9eSThomas Graf NLA_PUT(skb, attrtype, strlen(value) + 1, value) 803bfa83a9eSThomas Graf 804bfa83a9eSThomas Graf #define NLA_PUT_FLAG(skb, attrtype, value) \ 805bfa83a9eSThomas Graf NLA_PUT(skb, attrtype, 0, NULL) 806bfa83a9eSThomas Graf 807bfa83a9eSThomas Graf #define NLA_PUT_MSECS(skb, attrtype, jiffies) \ 808bfa83a9eSThomas Graf NLA_PUT_U64(skb, attrtype, jiffies_to_msecs(jiffies)) 809bfa83a9eSThomas Graf 810bfa83a9eSThomas Graf /** 811bfa83a9eSThomas Graf * nla_get_u32 - return payload of u32 attribute 812bfa83a9eSThomas Graf * @nla: u32 netlink attribute 813bfa83a9eSThomas Graf */ 814bfa83a9eSThomas Graf static inline u32 nla_get_u32(struct nlattr *nla) 815bfa83a9eSThomas Graf { 816bfa83a9eSThomas Graf return *(u32 *) nla_data(nla); 817bfa83a9eSThomas Graf } 818bfa83a9eSThomas Graf 819bfa83a9eSThomas Graf /** 820bfa83a9eSThomas Graf * nla_get_u16 - return payload of u16 attribute 821bfa83a9eSThomas Graf * @nla: u16 netlink attribute 822bfa83a9eSThomas Graf */ 823bfa83a9eSThomas Graf static inline u16 nla_get_u16(struct nlattr *nla) 824bfa83a9eSThomas Graf { 825bfa83a9eSThomas Graf return *(u16 *) nla_data(nla); 826bfa83a9eSThomas Graf } 827bfa83a9eSThomas Graf 828bfa83a9eSThomas Graf /** 829bfa83a9eSThomas Graf * nla_get_u8 - return payload of u8 attribute 830bfa83a9eSThomas Graf * @nla: u8 netlink attribute 831bfa83a9eSThomas Graf */ 832bfa83a9eSThomas Graf static inline u8 nla_get_u8(struct nlattr *nla) 833bfa83a9eSThomas Graf { 834bfa83a9eSThomas Graf return *(u8 *) nla_data(nla); 835bfa83a9eSThomas Graf } 836bfa83a9eSThomas Graf 837bfa83a9eSThomas Graf /** 838bfa83a9eSThomas Graf * nla_get_u64 - return payload of u64 attribute 839bfa83a9eSThomas Graf * @nla: u64 netlink attribute 840bfa83a9eSThomas Graf */ 841bfa83a9eSThomas Graf static inline u64 nla_get_u64(struct nlattr *nla) 842bfa83a9eSThomas Graf { 843bfa83a9eSThomas Graf u64 tmp; 844bfa83a9eSThomas Graf 845bfa83a9eSThomas Graf nla_memcpy(&tmp, nla, sizeof(tmp)); 846bfa83a9eSThomas Graf 847bfa83a9eSThomas Graf return tmp; 848bfa83a9eSThomas Graf } 849bfa83a9eSThomas Graf 850bfa83a9eSThomas Graf /** 851bfa83a9eSThomas Graf * nla_get_flag - return payload of flag attribute 852bfa83a9eSThomas Graf * @nla: flag netlink attribute 853bfa83a9eSThomas Graf */ 854bfa83a9eSThomas Graf static inline int nla_get_flag(struct nlattr *nla) 855bfa83a9eSThomas Graf { 856bfa83a9eSThomas Graf return !!nla; 857bfa83a9eSThomas Graf } 858bfa83a9eSThomas Graf 859bfa83a9eSThomas Graf /** 860bfa83a9eSThomas Graf * nla_get_msecs - return payload of msecs attribute 861bfa83a9eSThomas Graf * @nla: msecs netlink attribute 862bfa83a9eSThomas Graf * 863bfa83a9eSThomas Graf * Returns the number of milliseconds in jiffies. 864bfa83a9eSThomas Graf */ 865bfa83a9eSThomas Graf static inline unsigned long nla_get_msecs(struct nlattr *nla) 866bfa83a9eSThomas Graf { 867bfa83a9eSThomas Graf u64 msecs = nla_get_u64(nla); 868bfa83a9eSThomas Graf 869bfa83a9eSThomas Graf return msecs_to_jiffies((unsigned long) msecs); 870bfa83a9eSThomas Graf } 871bfa83a9eSThomas Graf 872bfa83a9eSThomas Graf /** 873bfa83a9eSThomas Graf * nla_nest_start - Start a new level of nested attributes 874bfa83a9eSThomas Graf * @skb: socket buffer to add attributes to 875bfa83a9eSThomas Graf * @attrtype: attribute type of container 876bfa83a9eSThomas Graf * 877bfa83a9eSThomas Graf * Returns the container attribute 878bfa83a9eSThomas Graf */ 879bfa83a9eSThomas Graf static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) 880bfa83a9eSThomas Graf { 881bfa83a9eSThomas Graf struct nlattr *start = (struct nlattr *) skb->tail; 882bfa83a9eSThomas Graf 883bfa83a9eSThomas Graf if (nla_put(skb, attrtype, 0, NULL) < 0) 884bfa83a9eSThomas Graf return NULL; 885bfa83a9eSThomas Graf 886bfa83a9eSThomas Graf return start; 887bfa83a9eSThomas Graf } 888bfa83a9eSThomas Graf 889bfa83a9eSThomas Graf /** 890bfa83a9eSThomas Graf * nla_nest_end - Finalize nesting of attributes 891bfa83a9eSThomas Graf * @skb: socket buffer the attribtues are stored in 892bfa83a9eSThomas Graf * @start: container attribute 893bfa83a9eSThomas Graf * 894bfa83a9eSThomas Graf * Corrects the container attribute header to include the all 895bfa83a9eSThomas Graf * appeneded attributes. 896bfa83a9eSThomas Graf * 897bfa83a9eSThomas Graf * Returns the total data length of the skb. 898bfa83a9eSThomas Graf */ 899bfa83a9eSThomas Graf static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) 900bfa83a9eSThomas Graf { 901bfa83a9eSThomas Graf start->nla_len = skb->tail - (unsigned char *) start; 902bfa83a9eSThomas Graf return skb->len; 903bfa83a9eSThomas Graf } 904bfa83a9eSThomas Graf 905bfa83a9eSThomas Graf /** 906bfa83a9eSThomas Graf * nla_nest_cancel - Cancel nesting of attributes 907bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 908bfa83a9eSThomas Graf * @start: container attribute 909bfa83a9eSThomas Graf * 910bfa83a9eSThomas Graf * Removes the container attribute and including all nested 911bfa83a9eSThomas Graf * attributes. Returns -1. 912bfa83a9eSThomas Graf */ 913bfa83a9eSThomas Graf static inline int nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) 914bfa83a9eSThomas Graf { 915fe4944e5SThomas Graf return nlmsg_trim(skb, start); 916bfa83a9eSThomas Graf } 917bfa83a9eSThomas Graf 918bfa83a9eSThomas Graf /** 919bfa83a9eSThomas Graf * nla_for_each_attr - iterate over a stream of attributes 920bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 921bfa83a9eSThomas Graf * @head: head of attribute stream 922bfa83a9eSThomas Graf * @len: length of attribute stream 923bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 924bfa83a9eSThomas Graf */ 925bfa83a9eSThomas Graf #define nla_for_each_attr(pos, head, len, rem) \ 926bfa83a9eSThomas Graf for (pos = head, rem = len; \ 927bfa83a9eSThomas Graf nla_ok(pos, rem); \ 928bfa83a9eSThomas Graf pos = nla_next(pos, &(rem))) 929bfa83a9eSThomas Graf 930fe4944e5SThomas Graf /** 931fe4944e5SThomas Graf * nla_for_each_nested - iterate over nested attributes 932fe4944e5SThomas Graf * @pos: loop counter, set to current attribute 933fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 934fe4944e5SThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 935fe4944e5SThomas Graf */ 936fe4944e5SThomas Graf #define nla_for_each_nested(pos, nla, rem) \ 937fe4944e5SThomas Graf nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) 938fe4944e5SThomas Graf 939bfa83a9eSThomas Graf #endif 940