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> 7930345eaSJiri Benc #include <linux/in6.h> 8bfa83a9eSThomas Graf 9bfa83a9eSThomas Graf /* ======================================================================== 10bfa83a9eSThomas Graf * Netlink Messages and Attributes Interface (As Seen On TV) 11bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 12bfa83a9eSThomas Graf * Messages Interface 13bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 14bfa83a9eSThomas Graf * 15bfa83a9eSThomas Graf * Message Format: 16bfa83a9eSThomas Graf * <--- nlmsg_total_size(payload) ---> 17bfa83a9eSThomas Graf * <-- nlmsg_msg_size(payload) -> 18bfa83a9eSThomas Graf * +----------+- - -+-------------+- - -+-------- - - 19bfa83a9eSThomas Graf * | nlmsghdr | Pad | Payload | Pad | nlmsghdr 20bfa83a9eSThomas Graf * +----------+- - -+-------------+- - -+-------- - - 21bfa83a9eSThomas Graf * nlmsg_data(nlh)---^ ^ 22bfa83a9eSThomas Graf * nlmsg_next(nlh)-----------------------+ 23bfa83a9eSThomas Graf * 24bfa83a9eSThomas Graf * Payload Format: 25bfa83a9eSThomas Graf * <---------------------- nlmsg_len(nlh) ---------------------> 26bfa83a9eSThomas Graf * <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) -> 27bfa83a9eSThomas Graf * +----------------------+- - -+--------------------------------+ 28bfa83a9eSThomas Graf * | Family Header | Pad | Attributes | 29bfa83a9eSThomas Graf * +----------------------+- - -+--------------------------------+ 30bfa83a9eSThomas Graf * nlmsg_attrdata(nlh, hdrlen)---^ 31bfa83a9eSThomas Graf * 32bfa83a9eSThomas Graf * Data Structures: 33bfa83a9eSThomas Graf * struct nlmsghdr netlink message header 34bfa83a9eSThomas Graf * 35bfa83a9eSThomas Graf * Message Construction: 36bfa83a9eSThomas Graf * nlmsg_new() create a new netlink message 37bfa83a9eSThomas Graf * nlmsg_put() add a netlink message to an skb 38bfa83a9eSThomas Graf * nlmsg_put_answer() callback based nlmsg_put() 391dc8d8c0SJustin P. Mattock * nlmsg_end() finalize netlink message 40fe4944e5SThomas Graf * nlmsg_get_pos() return current position in message 41fe4944e5SThomas Graf * nlmsg_trim() trim part of message 42bfa83a9eSThomas Graf * nlmsg_cancel() cancel message construction 43bfa83a9eSThomas Graf * nlmsg_free() free a netlink message 44bfa83a9eSThomas Graf * 45bfa83a9eSThomas Graf * Message Sending: 46bfa83a9eSThomas Graf * nlmsg_multicast() multicast message to several groups 47bfa83a9eSThomas Graf * nlmsg_unicast() unicast a message to a single socket 48d387f6adSThomas Graf * nlmsg_notify() send notification message 49bfa83a9eSThomas Graf * 50bfa83a9eSThomas Graf * Message Length Calculations: 51bfa83a9eSThomas Graf * nlmsg_msg_size(payload) length of message w/o padding 52bfa83a9eSThomas Graf * nlmsg_total_size(payload) length of message w/ padding 53bfa83a9eSThomas Graf * nlmsg_padlen(payload) length of padding at tail 54bfa83a9eSThomas Graf * 55bfa83a9eSThomas Graf * Message Payload Access: 56bfa83a9eSThomas Graf * nlmsg_data(nlh) head of message payload 57bfa83a9eSThomas Graf * nlmsg_len(nlh) length of message payload 58bfa83a9eSThomas Graf * nlmsg_attrdata(nlh, hdrlen) head of attributes data 59bfa83a9eSThomas Graf * nlmsg_attrlen(nlh, hdrlen) length of attributes data 60bfa83a9eSThomas Graf * 61bfa83a9eSThomas Graf * Message Parsing: 62bfa83a9eSThomas Graf * nlmsg_ok(nlh, remaining) does nlh fit into remaining bytes? 63bfa83a9eSThomas Graf * nlmsg_next(nlh, remaining) get next netlink message 64bfa83a9eSThomas Graf * nlmsg_parse() parse attributes of a message 65bfa83a9eSThomas Graf * nlmsg_find_attr() find an attribute in a message 66bfa83a9eSThomas Graf * nlmsg_for_each_msg() loop over all messages 67bfa83a9eSThomas Graf * nlmsg_validate() validate netlink message incl. attrs 68bfa83a9eSThomas Graf * nlmsg_for_each_attr() loop over all attributes 69bfa83a9eSThomas Graf * 7097676b6bSThomas Graf * Misc: 7197676b6bSThomas Graf * nlmsg_report() report back to application? 7297676b6bSThomas Graf * 73bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 74bfa83a9eSThomas Graf * Attributes Interface 75bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 76bfa83a9eSThomas Graf * 77bfa83a9eSThomas Graf * Attribute Format: 78bfa83a9eSThomas Graf * <------- nla_total_size(payload) -------> 79bfa83a9eSThomas Graf * <---- nla_attr_size(payload) -----> 80bfa83a9eSThomas Graf * +----------+- - -+- - - - - - - - - +- - -+-------- - - 81bfa83a9eSThomas Graf * | Header | Pad | Payload | Pad | Header 82bfa83a9eSThomas Graf * +----------+- - -+- - - - - - - - - +- - -+-------- - - 83bfa83a9eSThomas Graf * <- nla_len(nla) -> ^ 84bfa83a9eSThomas Graf * nla_data(nla)----^ | 85bfa83a9eSThomas Graf * nla_next(nla)-----------------------------' 86bfa83a9eSThomas Graf * 87bfa83a9eSThomas Graf * Data Structures: 88d1ec3b77SPierre Ynard * struct nlattr netlink attribute header 89bfa83a9eSThomas Graf * 90bfa83a9eSThomas Graf * Attribute Construction: 91fe4944e5SThomas Graf * nla_reserve(skb, type, len) reserve room for an attribute 92fe4944e5SThomas Graf * nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr 93bfa83a9eSThomas Graf * nla_put(skb, type, len, data) add attribute to skb 94fe4944e5SThomas Graf * nla_put_nohdr(skb, len, data) add attribute w/o hdr 9501480e1cSPatrick McHardy * nla_append(skb, len, data) append data to skb 96bfa83a9eSThomas Graf * 97bfa83a9eSThomas Graf * Attribute Construction for Basic Types: 98bfa83a9eSThomas Graf * nla_put_u8(skb, type, value) add u8 attribute to skb 99bfa83a9eSThomas Graf * nla_put_u16(skb, type, value) add u16 attribute to skb 100bfa83a9eSThomas Graf * nla_put_u32(skb, type, value) add u32 attribute to skb 101bfa83a9eSThomas Graf * nla_put_u64(skb, type, value) add u64 attribute to skb 1024778e0beSJiri Pirko * nla_put_s8(skb, type, value) add s8 attribute to skb 1034778e0beSJiri Pirko * nla_put_s16(skb, type, value) add s16 attribute to skb 1044778e0beSJiri Pirko * nla_put_s32(skb, type, value) add s32 attribute to skb 105756a2f59SNicolas Dichtel * nla_put_s64(skb, type, value, 106756a2f59SNicolas Dichtel * padattr) add s64 attribute to skb 107bfa83a9eSThomas Graf * nla_put_string(skb, type, str) add string attribute to skb 108bfa83a9eSThomas Graf * nla_put_flag(skb, type) add flag attribute to skb 1092175d87cSNicolas Dichtel * nla_put_msecs(skb, type, jiffies, 1102175d87cSNicolas Dichtel * padattr) add msecs attribute to skb 111930345eaSJiri Benc * nla_put_in_addr(skb, type, addr) add IPv4 address attribute to skb 112930345eaSJiri Benc * nla_put_in6_addr(skb, type, addr) add IPv6 address attribute to skb 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 1334778e0beSJiri Pirko * nla_get_s8(nla) get payload for a s8 attribute 1344778e0beSJiri Pirko * nla_get_s16(nla) get payload for a s16 attribute 1354778e0beSJiri Pirko * nla_get_s32(nla) get payload for a s32 attribute 1364778e0beSJiri Pirko * nla_get_s64(nla) get payload for a s64 attribute 137bfa83a9eSThomas Graf * nla_get_flag(nla) return 1 if flag is true 138bfa83a9eSThomas Graf * nla_get_msecs(nla) get payload for a msecs attribute 139bfa83a9eSThomas Graf * 140bfa83a9eSThomas Graf * Attribute Misc: 141bfa83a9eSThomas Graf * nla_memcpy(dest, nla, count) copy attribute into memory 142bfa83a9eSThomas Graf * nla_memcmp(nla, data, size) compare attribute with memory area 143bfa83a9eSThomas Graf * nla_strlcpy(dst, nla, size) copy attribute to a sized string 144bfa83a9eSThomas Graf * nla_strcmp(nla, str) compare attribute with string 145bfa83a9eSThomas Graf * 146bfa83a9eSThomas Graf * Attribute Parsing: 147bfa83a9eSThomas Graf * nla_ok(nla, remaining) does nla fit into remaining bytes? 148bfa83a9eSThomas Graf * nla_next(nla, remaining) get next netlink attribute 149bfa83a9eSThomas Graf * nla_validate() validate a stream of attributes 1504fe5d5c0SPaul Moore * nla_validate_nested() validate a stream of nested attributes 151bfa83a9eSThomas Graf * nla_find() find attribute in stream of attributes 152fe4944e5SThomas Graf * nla_find_nested() find attribute in nested attributes 153bfa83a9eSThomas Graf * nla_parse() parse and validate stream of attrs 154bfa83a9eSThomas Graf * nla_parse_nested() parse nested attribuets 155bfa83a9eSThomas Graf * nla_for_each_attr() loop over all attributes 15622acb19aSPaul Moore * nla_for_each_nested() loop over the nested attributes 157bfa83a9eSThomas Graf *========================================================================= 158bfa83a9eSThomas Graf */ 159bfa83a9eSThomas Graf 160bfa83a9eSThomas Graf /** 161bfa83a9eSThomas Graf * Standard attribute types to specify validation policy 162bfa83a9eSThomas Graf */ 163bfa83a9eSThomas Graf enum { 164bfa83a9eSThomas Graf NLA_UNSPEC, 165bfa83a9eSThomas Graf NLA_U8, 166bfa83a9eSThomas Graf NLA_U16, 167bfa83a9eSThomas Graf NLA_U32, 168bfa83a9eSThomas Graf NLA_U64, 169bfa83a9eSThomas Graf NLA_STRING, 170bfa83a9eSThomas Graf NLA_FLAG, 171bfa83a9eSThomas Graf NLA_MSECS, 172bfa83a9eSThomas Graf NLA_NESTED, 1731092cb21SPatrick McHardy NLA_NESTED_COMPAT, 174a5531a5dSThomas Graf NLA_NUL_STRING, 175d30045a0SJohannes Berg NLA_BINARY, 1764778e0beSJiri Pirko NLA_S8, 1774778e0beSJiri Pirko NLA_S16, 1784778e0beSJiri Pirko NLA_S32, 1794778e0beSJiri Pirko NLA_S64, 180bfa83a9eSThomas Graf __NLA_TYPE_MAX, 181bfa83a9eSThomas Graf }; 182bfa83a9eSThomas Graf 183bfa83a9eSThomas Graf #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) 184bfa83a9eSThomas Graf 185bfa83a9eSThomas Graf /** 186bfa83a9eSThomas Graf * struct nla_policy - attribute validation policy 187bfa83a9eSThomas Graf * @type: Type of attribute or NLA_UNSPEC 188a5531a5dSThomas Graf * @len: Type specific length of payload 189bfa83a9eSThomas Graf * 190bfa83a9eSThomas Graf * Policies are defined as arrays of this struct, the array must be 191bfa83a9eSThomas Graf * accessible by attribute type up to the highest identifier to be expected. 192bfa83a9eSThomas Graf * 193a5531a5dSThomas Graf * Meaning of `len' field: 194a5531a5dSThomas Graf * NLA_STRING Maximum length of string 195a5531a5dSThomas Graf * NLA_NUL_STRING Maximum length of string (excluding NUL) 196a5531a5dSThomas Graf * NLA_FLAG Unused 197d30045a0SJohannes Berg * NLA_BINARY Maximum length of attribute payload 1984b6cc728SJohannes Berg * NLA_NESTED Don't use `len' field -- length verification is 1994b6cc728SJohannes Berg * done by checking len of nested header (or empty) 2004b6cc728SJohannes Berg * NLA_NESTED_COMPAT Minimum length of structure payload 2014b6cc728SJohannes Berg * NLA_U8, NLA_U16, 2024b6cc728SJohannes Berg * NLA_U32, NLA_U64, 2034778e0beSJiri Pirko * NLA_S8, NLA_S16, 2044778e0beSJiri Pirko * NLA_S32, NLA_S64, 2054b6cc728SJohannes Berg * NLA_MSECS Leaving the length field zero will verify the 2064b6cc728SJohannes Berg * given type fits, using it verifies minimum length 2074b6cc728SJohannes Berg * just like "All other" 2084b6cc728SJohannes Berg * All other Minimum length of attribute payload 209a5531a5dSThomas Graf * 210bfa83a9eSThomas Graf * Example: 211b54452b0SAlexey Dobriyan * static const struct nla_policy my_policy[ATTR_MAX+1] = { 212bfa83a9eSThomas Graf * [ATTR_FOO] = { .type = NLA_U16 }, 213d30045a0SJohannes Berg * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ }, 214a5531a5dSThomas Graf * [ATTR_BAZ] = { .len = sizeof(struct mystruct) }, 215bfa83a9eSThomas Graf * }; 216bfa83a9eSThomas Graf */ 217bfa83a9eSThomas Graf struct nla_policy { 218bfa83a9eSThomas Graf u16 type; 219a5531a5dSThomas Graf u16 len; 220bfa83a9eSThomas Graf }; 221bfa83a9eSThomas Graf 2224e902c57SThomas Graf /** 2234e902c57SThomas Graf * struct nl_info - netlink source information 2244e902c57SThomas Graf * @nlh: Netlink message header of original request 22515e47304SEric W. Biederman * @portid: Netlink PORTID of requesting application 2264e902c57SThomas Graf */ 2274e902c57SThomas Graf struct nl_info { 2284e902c57SThomas Graf struct nlmsghdr *nlh; 2294d1169c1SDenis V. Lunev struct net *nl_net; 23015e47304SEric W. Biederman u32 portid; 2314e902c57SThomas Graf }; 2324e902c57SThomas Graf 2334f69053bSJoe Perches int netlink_rcv_skb(struct sk_buff *skb, 2344f69053bSJoe Perches int (*cb)(struct sk_buff *, struct nlmsghdr *)); 2354f69053bSJoe Perches int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, 2364f69053bSJoe Perches unsigned int group, int report, gfp_t flags); 23782ace47aSThomas Graf 2384f69053bSJoe Perches int nla_validate(const struct nlattr *head, int len, int maxtype, 239ef7c79edSPatrick McHardy const struct nla_policy *policy); 2404f69053bSJoe Perches int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head, 2414f69053bSJoe Perches int len, const struct nla_policy *policy); 2424f69053bSJoe Perches int nla_policy_len(const struct nla_policy *, int); 2434f69053bSJoe Perches struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype); 2444f69053bSJoe Perches size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize); 2454f69053bSJoe Perches int nla_memcpy(void *dest, const struct nlattr *src, int count); 2464f69053bSJoe Perches int nla_memcmp(const struct nlattr *nla, const void *data, size_t size); 2474f69053bSJoe Perches int nla_strcmp(const struct nlattr *nla, const char *str); 2484f69053bSJoe Perches struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); 249089bf1a6SNicolas Dichtel struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, 250089bf1a6SNicolas Dichtel int attrlen, int padattr); 2514f69053bSJoe Perches void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 2524f69053bSJoe Perches struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); 253089bf1a6SNicolas Dichtel struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, 254089bf1a6SNicolas Dichtel int attrlen, int padattr); 2554f69053bSJoe Perches void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 2564f69053bSJoe Perches void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, 257fe4944e5SThomas Graf const void *data); 258089bf1a6SNicolas Dichtel void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, 259089bf1a6SNicolas Dichtel const void *data, int padattr); 2604f69053bSJoe Perches void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); 2614f69053bSJoe Perches int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data); 262089bf1a6SNicolas Dichtel int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, 263089bf1a6SNicolas Dichtel const void *data, int padattr); 2644f69053bSJoe Perches int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); 2654f69053bSJoe Perches int nla_append(struct sk_buff *skb, int attrlen, const void *data); 266bfa83a9eSThomas Graf 267bfa83a9eSThomas Graf /************************************************************************** 268bfa83a9eSThomas Graf * Netlink Messages 269bfa83a9eSThomas Graf **************************************************************************/ 270bfa83a9eSThomas Graf 271bfa83a9eSThomas Graf /** 272bfa83a9eSThomas Graf * nlmsg_msg_size - length of netlink message not including padding 273bfa83a9eSThomas Graf * @payload: length of message payload 274bfa83a9eSThomas Graf */ 275bfa83a9eSThomas Graf static inline int nlmsg_msg_size(int payload) 276bfa83a9eSThomas Graf { 277bfa83a9eSThomas Graf return NLMSG_HDRLEN + payload; 278bfa83a9eSThomas Graf } 279bfa83a9eSThomas Graf 280bfa83a9eSThomas Graf /** 281bfa83a9eSThomas Graf * nlmsg_total_size - length of netlink message including padding 282bfa83a9eSThomas Graf * @payload: length of message payload 283bfa83a9eSThomas Graf */ 284bfa83a9eSThomas Graf static inline int nlmsg_total_size(int payload) 285bfa83a9eSThomas Graf { 286bfa83a9eSThomas Graf return NLMSG_ALIGN(nlmsg_msg_size(payload)); 287bfa83a9eSThomas Graf } 288bfa83a9eSThomas Graf 289bfa83a9eSThomas Graf /** 290bfa83a9eSThomas Graf * nlmsg_padlen - length of padding at the message's tail 291bfa83a9eSThomas Graf * @payload: length of message payload 292bfa83a9eSThomas Graf */ 293bfa83a9eSThomas Graf static inline int nlmsg_padlen(int payload) 294bfa83a9eSThomas Graf { 295bfa83a9eSThomas Graf return nlmsg_total_size(payload) - nlmsg_msg_size(payload); 296bfa83a9eSThomas Graf } 297bfa83a9eSThomas Graf 298bfa83a9eSThomas Graf /** 299bfa83a9eSThomas Graf * nlmsg_data - head of message payload 30070f23fd6SJustin P. Mattock * @nlh: netlink message header 301bfa83a9eSThomas Graf */ 302bfa83a9eSThomas Graf static inline void *nlmsg_data(const struct nlmsghdr *nlh) 303bfa83a9eSThomas Graf { 304bfa83a9eSThomas Graf return (unsigned char *) nlh + NLMSG_HDRLEN; 305bfa83a9eSThomas Graf } 306bfa83a9eSThomas Graf 307bfa83a9eSThomas Graf /** 308bfa83a9eSThomas Graf * nlmsg_len - length of message payload 309bfa83a9eSThomas Graf * @nlh: netlink message header 310bfa83a9eSThomas Graf */ 311bfa83a9eSThomas Graf static inline int nlmsg_len(const struct nlmsghdr *nlh) 312bfa83a9eSThomas Graf { 313bfa83a9eSThomas Graf return nlh->nlmsg_len - NLMSG_HDRLEN; 314bfa83a9eSThomas Graf } 315bfa83a9eSThomas Graf 316bfa83a9eSThomas Graf /** 317bfa83a9eSThomas Graf * nlmsg_attrdata - head of attributes data 318bfa83a9eSThomas Graf * @nlh: netlink message header 319bfa83a9eSThomas Graf * @hdrlen: length of family specific header 320bfa83a9eSThomas Graf */ 321bfa83a9eSThomas Graf static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, 322bfa83a9eSThomas Graf int hdrlen) 323bfa83a9eSThomas Graf { 324bfa83a9eSThomas Graf unsigned char *data = nlmsg_data(nlh); 325bfa83a9eSThomas Graf return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); 326bfa83a9eSThomas Graf } 327bfa83a9eSThomas Graf 328bfa83a9eSThomas Graf /** 329bfa83a9eSThomas Graf * nlmsg_attrlen - length of attributes data 330bfa83a9eSThomas Graf * @nlh: netlink message header 331bfa83a9eSThomas Graf * @hdrlen: length of family specific header 332bfa83a9eSThomas Graf */ 333bfa83a9eSThomas Graf static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) 334bfa83a9eSThomas Graf { 335bfa83a9eSThomas Graf return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); 336bfa83a9eSThomas Graf } 337bfa83a9eSThomas Graf 338bfa83a9eSThomas Graf /** 339bfa83a9eSThomas Graf * nlmsg_ok - check if the netlink message fits into the remaining bytes 340bfa83a9eSThomas Graf * @nlh: netlink message header 341bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 342bfa83a9eSThomas Graf */ 343bfa83a9eSThomas Graf static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) 344bfa83a9eSThomas Graf { 345619e803dSVegard Nossum return (remaining >= (int) sizeof(struct nlmsghdr) && 346bfa83a9eSThomas Graf nlh->nlmsg_len >= sizeof(struct nlmsghdr) && 347bfa83a9eSThomas Graf nlh->nlmsg_len <= remaining); 348bfa83a9eSThomas Graf } 349bfa83a9eSThomas Graf 350bfa83a9eSThomas Graf /** 351bfa83a9eSThomas Graf * nlmsg_next - next netlink message in message stream 352bfa83a9eSThomas Graf * @nlh: netlink message header 353bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 354bfa83a9eSThomas Graf * 355bfa83a9eSThomas Graf * Returns the next netlink message in the message stream and 356bfa83a9eSThomas Graf * decrements remaining by the size of the current message. 357bfa83a9eSThomas Graf */ 3583654654fSJan Engelhardt static inline struct nlmsghdr * 3593654654fSJan Engelhardt nlmsg_next(const struct nlmsghdr *nlh, int *remaining) 360bfa83a9eSThomas Graf { 361bfa83a9eSThomas Graf int totlen = NLMSG_ALIGN(nlh->nlmsg_len); 362bfa83a9eSThomas Graf 363bfa83a9eSThomas Graf *remaining -= totlen; 364bfa83a9eSThomas Graf 365bfa83a9eSThomas Graf return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); 366bfa83a9eSThomas Graf } 367bfa83a9eSThomas Graf 368bfa83a9eSThomas Graf /** 369bfa83a9eSThomas Graf * nlmsg_parse - parse attributes of a netlink message 370bfa83a9eSThomas Graf * @nlh: netlink message header 371bfa83a9eSThomas Graf * @hdrlen: length of family specific header 372bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 373bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 374bfa83a9eSThomas Graf * @policy: validation policy 375bfa83a9eSThomas Graf * 376bfa83a9eSThomas Graf * See nla_parse() 377bfa83a9eSThomas Graf */ 3783a6c2b41SPatrick McHardy static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, 379bfa83a9eSThomas Graf struct nlattr *tb[], int maxtype, 380ef7c79edSPatrick McHardy const struct nla_policy *policy) 381bfa83a9eSThomas Graf { 382bfa83a9eSThomas Graf if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) 383bfa83a9eSThomas Graf return -EINVAL; 384bfa83a9eSThomas Graf 385bfa83a9eSThomas Graf return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), 386bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), policy); 387bfa83a9eSThomas Graf } 388bfa83a9eSThomas Graf 389bfa83a9eSThomas Graf /** 390bfa83a9eSThomas Graf * nlmsg_find_attr - find a specific attribute in a netlink message 391bfa83a9eSThomas Graf * @nlh: netlink message header 392bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 393bfa83a9eSThomas Graf * @attrtype: type of attribute to look for 394bfa83a9eSThomas Graf * 395bfa83a9eSThomas Graf * Returns the first attribute which matches the specified type. 396bfa83a9eSThomas Graf */ 3976b8c92baSNelson Elhage static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, 398bfa83a9eSThomas Graf int hdrlen, int attrtype) 399bfa83a9eSThomas Graf { 400bfa83a9eSThomas Graf return nla_find(nlmsg_attrdata(nlh, hdrlen), 401bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), attrtype); 402bfa83a9eSThomas Graf } 403bfa83a9eSThomas Graf 404bfa83a9eSThomas Graf /** 405bfa83a9eSThomas Graf * nlmsg_validate - validate a netlink message including attributes 406bfa83a9eSThomas Graf * @nlh: netlinket message header 407bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 408bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 409bfa83a9eSThomas Graf * @policy: validation policy 410bfa83a9eSThomas Graf */ 4113654654fSJan Engelhardt static inline int nlmsg_validate(const struct nlmsghdr *nlh, 4123654654fSJan Engelhardt int hdrlen, int maxtype, 413ef7c79edSPatrick McHardy const struct nla_policy *policy) 414bfa83a9eSThomas Graf { 415bfa83a9eSThomas Graf if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) 416bfa83a9eSThomas Graf return -EINVAL; 417bfa83a9eSThomas Graf 418bfa83a9eSThomas Graf return nla_validate(nlmsg_attrdata(nlh, hdrlen), 419bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), maxtype, policy); 420bfa83a9eSThomas Graf } 421bfa83a9eSThomas Graf 422bfa83a9eSThomas Graf /** 42397676b6bSThomas Graf * nlmsg_report - need to report back to application? 42497676b6bSThomas Graf * @nlh: netlink message header 42597676b6bSThomas Graf * 42697676b6bSThomas Graf * Returns 1 if a report back to the application is requested. 42797676b6bSThomas Graf */ 4283a6c2b41SPatrick McHardy static inline int nlmsg_report(const struct nlmsghdr *nlh) 42997676b6bSThomas Graf { 43097676b6bSThomas Graf return !!(nlh->nlmsg_flags & NLM_F_ECHO); 43197676b6bSThomas Graf } 43297676b6bSThomas Graf 43397676b6bSThomas Graf /** 434bfa83a9eSThomas Graf * nlmsg_for_each_attr - iterate over a stream of attributes 435bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 436bfa83a9eSThomas Graf * @nlh: netlink message header 437bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 438bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 439bfa83a9eSThomas Graf */ 440bfa83a9eSThomas Graf #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ 441bfa83a9eSThomas Graf nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ 442bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), rem) 443bfa83a9eSThomas Graf 444bfa83a9eSThomas Graf /** 445bfa83a9eSThomas Graf * nlmsg_put - Add a new netlink message to an skb 446bfa83a9eSThomas Graf * @skb: socket buffer to store message in 4472c6ba4b1SNicolas Dichtel * @portid: netlink PORTID of requesting application 448bfa83a9eSThomas Graf * @seq: sequence number of message 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 */ 45615e47304SEric W. Biederman static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, 457bfa83a9eSThomas Graf int type, int payload, int flags) 458bfa83a9eSThomas Graf { 459bfa83a9eSThomas Graf if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) 460bfa83a9eSThomas Graf return NULL; 461bfa83a9eSThomas Graf 46215e47304SEric W. Biederman return __nlmsg_put(skb, portid, seq, type, payload, flags); 463bfa83a9eSThomas Graf } 464bfa83a9eSThomas Graf 465bfa83a9eSThomas Graf /** 466bfa83a9eSThomas Graf * nlmsg_put_answer - Add a new callback based netlink message to an skb 467bfa83a9eSThomas Graf * @skb: socket buffer to store message in 468bfa83a9eSThomas Graf * @cb: netlink callback 469bfa83a9eSThomas Graf * @type: message type 470bfa83a9eSThomas Graf * @payload: length of message payload 471bfa83a9eSThomas Graf * @flags: message flags 472bfa83a9eSThomas Graf * 473bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 474bfa83a9eSThomas Graf * the message header and payload. 475bfa83a9eSThomas Graf */ 476bfa83a9eSThomas Graf static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, 477bfa83a9eSThomas Graf struct netlink_callback *cb, 478bfa83a9eSThomas Graf int type, int payload, 479bfa83a9eSThomas Graf int flags) 480bfa83a9eSThomas Graf { 48115e47304SEric W. Biederman return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 482bfa83a9eSThomas Graf type, payload, flags); 483bfa83a9eSThomas Graf } 484bfa83a9eSThomas Graf 485bfa83a9eSThomas Graf /** 486bfa83a9eSThomas Graf * nlmsg_new - Allocate a new netlink message 487339bf98fSThomas Graf * @payload: size of the message payload 488fe4944e5SThomas Graf * @flags: the type of memory to allocate. 489bfa83a9eSThomas Graf * 490339bf98fSThomas Graf * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known 491339bf98fSThomas Graf * and a good default is needed. 492bfa83a9eSThomas Graf */ 493339bf98fSThomas Graf static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) 494bfa83a9eSThomas Graf { 495339bf98fSThomas Graf return alloc_skb(nlmsg_total_size(payload), flags); 496bfa83a9eSThomas Graf } 497bfa83a9eSThomas Graf 498bfa83a9eSThomas Graf /** 499bfa83a9eSThomas Graf * nlmsg_end - Finalize a netlink message 500bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 501bfa83a9eSThomas Graf * @nlh: netlink message header 502bfa83a9eSThomas Graf * 503bfa83a9eSThomas Graf * Corrects the netlink message header to include the appeneded 504bfa83a9eSThomas Graf * attributes. Only necessary if attributes have been added to 505bfa83a9eSThomas Graf * the message. 506bfa83a9eSThomas Graf */ 507053c095aSJohannes Berg static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) 508bfa83a9eSThomas Graf { 50927a884dcSArnaldo Carvalho de Melo nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; 510bfa83a9eSThomas Graf } 511bfa83a9eSThomas Graf 512bfa83a9eSThomas Graf /** 513fe4944e5SThomas Graf * nlmsg_get_pos - return current position in netlink message 514fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 515fe4944e5SThomas Graf * 516fe4944e5SThomas Graf * Returns a pointer to the current tail of the message. 517fe4944e5SThomas Graf */ 518fe4944e5SThomas Graf static inline void *nlmsg_get_pos(struct sk_buff *skb) 519fe4944e5SThomas Graf { 52027a884dcSArnaldo Carvalho de Melo return skb_tail_pointer(skb); 521fe4944e5SThomas Graf } 522fe4944e5SThomas Graf 523fe4944e5SThomas Graf /** 524fe4944e5SThomas Graf * nlmsg_trim - Trim message to a mark 525fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 526fe4944e5SThomas Graf * @mark: mark to trim to 527fe4944e5SThomas Graf * 528bc3ed28cSThomas Graf * Trims the message to the provided mark. 529fe4944e5SThomas Graf */ 530bc3ed28cSThomas Graf static inline void nlmsg_trim(struct sk_buff *skb, const void *mark) 531fe4944e5SThomas Graf { 532149118d8SThomas Graf if (mark) { 533149118d8SThomas Graf WARN_ON((unsigned char *) mark < skb->data); 534fe4944e5SThomas Graf skb_trim(skb, (unsigned char *) mark - skb->data); 535fe4944e5SThomas Graf } 536149118d8SThomas Graf } 537fe4944e5SThomas Graf 538fe4944e5SThomas Graf /** 539bfa83a9eSThomas Graf * nlmsg_cancel - Cancel construction of a netlink message 540bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 541bfa83a9eSThomas Graf * @nlh: netlink message header 542bfa83a9eSThomas Graf * 543bfa83a9eSThomas Graf * Removes the complete netlink message including all 544bc3ed28cSThomas Graf * attributes from the socket buffer again. 545bfa83a9eSThomas Graf */ 546bc3ed28cSThomas Graf static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) 547bfa83a9eSThomas Graf { 548bc3ed28cSThomas Graf nlmsg_trim(skb, nlh); 549bfa83a9eSThomas Graf } 550bfa83a9eSThomas Graf 551bfa83a9eSThomas Graf /** 552bfa83a9eSThomas Graf * nlmsg_free - free a netlink message 553bfa83a9eSThomas Graf * @skb: socket buffer of netlink message 554bfa83a9eSThomas Graf */ 555bfa83a9eSThomas Graf static inline void nlmsg_free(struct sk_buff *skb) 556bfa83a9eSThomas Graf { 557bfa83a9eSThomas Graf kfree_skb(skb); 558bfa83a9eSThomas Graf } 559bfa83a9eSThomas Graf 560bfa83a9eSThomas Graf /** 561bfa83a9eSThomas Graf * nlmsg_multicast - multicast a netlink message 562bfa83a9eSThomas Graf * @sk: netlink socket to spread messages to 563bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 56415e47304SEric W. Biederman * @portid: own netlink portid to avoid sending to yourself 565bfa83a9eSThomas Graf * @group: multicast group id 566d387f6adSThomas Graf * @flags: allocation flags 567bfa83a9eSThomas Graf */ 568bfa83a9eSThomas Graf static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, 56915e47304SEric W. Biederman u32 portid, unsigned int group, gfp_t flags) 570bfa83a9eSThomas Graf { 571bfa83a9eSThomas Graf int err; 572bfa83a9eSThomas Graf 573bfa83a9eSThomas Graf NETLINK_CB(skb).dst_group = group; 574bfa83a9eSThomas Graf 57515e47304SEric W. Biederman err = netlink_broadcast(sk, skb, portid, group, flags); 576bfa83a9eSThomas Graf if (err > 0) 577bfa83a9eSThomas Graf err = 0; 578bfa83a9eSThomas Graf 579bfa83a9eSThomas Graf return err; 580bfa83a9eSThomas Graf } 581bfa83a9eSThomas Graf 582bfa83a9eSThomas Graf /** 583bfa83a9eSThomas Graf * nlmsg_unicast - unicast a netlink message 584bfa83a9eSThomas Graf * @sk: netlink socket to spread message to 585bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 58615e47304SEric W. Biederman * @portid: netlink portid of the destination socket 587bfa83a9eSThomas Graf */ 58815e47304SEric W. Biederman static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid) 589bfa83a9eSThomas Graf { 590bfa83a9eSThomas Graf int err; 591bfa83a9eSThomas Graf 59215e47304SEric W. Biederman err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT); 593bfa83a9eSThomas Graf if (err > 0) 594bfa83a9eSThomas Graf err = 0; 595bfa83a9eSThomas Graf 596bfa83a9eSThomas Graf return err; 597bfa83a9eSThomas Graf } 598bfa83a9eSThomas Graf 599bfa83a9eSThomas Graf /** 600bfa83a9eSThomas Graf * nlmsg_for_each_msg - iterate over a stream of messages 601bfa83a9eSThomas Graf * @pos: loop counter, set to current message 602bfa83a9eSThomas Graf * @head: head of message stream 603bfa83a9eSThomas Graf * @len: length of message stream 604bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 605bfa83a9eSThomas Graf */ 606bfa83a9eSThomas Graf #define nlmsg_for_each_msg(pos, head, len, rem) \ 607bfa83a9eSThomas Graf for (pos = head, rem = len; \ 608bfa83a9eSThomas Graf nlmsg_ok(pos, rem); \ 609bfa83a9eSThomas Graf pos = nlmsg_next(pos, &(rem))) 610bfa83a9eSThomas Graf 611670dc283SJohannes Berg /** 612670dc283SJohannes Berg * nl_dump_check_consistent - check if sequence is consistent and advertise if not 613670dc283SJohannes Berg * @cb: netlink callback structure that stores the sequence number 614670dc283SJohannes Berg * @nlh: netlink message header to write the flag to 615670dc283SJohannes Berg * 616670dc283SJohannes Berg * This function checks if the sequence (generation) number changed during dump 617670dc283SJohannes Berg * and if it did, advertises it in the netlink message header. 618670dc283SJohannes Berg * 619670dc283SJohannes Berg * The correct way to use it is to set cb->seq to the generation counter when 620670dc283SJohannes Berg * all locks for dumping have been acquired, and then call this function for 621670dc283SJohannes Berg * each message that is generated. 622670dc283SJohannes Berg * 623670dc283SJohannes Berg * Note that due to initialisation concerns, 0 is an invalid sequence number 624670dc283SJohannes Berg * and must not be used by code that uses this functionality. 625670dc283SJohannes Berg */ 626670dc283SJohannes Berg static inline void 627670dc283SJohannes Berg nl_dump_check_consistent(struct netlink_callback *cb, 628670dc283SJohannes Berg struct nlmsghdr *nlh) 629670dc283SJohannes Berg { 630670dc283SJohannes Berg if (cb->prev_seq && cb->seq != cb->prev_seq) 631670dc283SJohannes Berg nlh->nlmsg_flags |= NLM_F_DUMP_INTR; 632670dc283SJohannes Berg cb->prev_seq = cb->seq; 633670dc283SJohannes Berg } 634670dc283SJohannes Berg 635bfa83a9eSThomas Graf /************************************************************************** 636bfa83a9eSThomas Graf * Netlink Attributes 637bfa83a9eSThomas Graf **************************************************************************/ 638bfa83a9eSThomas Graf 639bfa83a9eSThomas Graf /** 640bfa83a9eSThomas Graf * nla_attr_size - length of attribute not including padding 641bfa83a9eSThomas Graf * @payload: length of payload 642bfa83a9eSThomas Graf */ 643bfa83a9eSThomas Graf static inline int nla_attr_size(int payload) 644bfa83a9eSThomas Graf { 645bfa83a9eSThomas Graf return NLA_HDRLEN + payload; 646bfa83a9eSThomas Graf } 647bfa83a9eSThomas Graf 648bfa83a9eSThomas Graf /** 649bfa83a9eSThomas Graf * nla_total_size - total length of attribute including padding 650bfa83a9eSThomas Graf * @payload: length of payload 651bfa83a9eSThomas Graf */ 652bfa83a9eSThomas Graf static inline int nla_total_size(int payload) 653bfa83a9eSThomas Graf { 654bfa83a9eSThomas Graf return NLA_ALIGN(nla_attr_size(payload)); 655bfa83a9eSThomas Graf } 656bfa83a9eSThomas Graf 657bfa83a9eSThomas Graf /** 658bfa83a9eSThomas Graf * nla_padlen - length of padding at the tail of attribute 659bfa83a9eSThomas Graf * @payload: length of payload 660bfa83a9eSThomas Graf */ 661bfa83a9eSThomas Graf static inline int nla_padlen(int payload) 662bfa83a9eSThomas Graf { 663bfa83a9eSThomas Graf return nla_total_size(payload) - nla_attr_size(payload); 664bfa83a9eSThomas Graf } 665bfa83a9eSThomas Graf 666bfa83a9eSThomas Graf /** 6678f4c1f9bSThomas Graf * nla_type - attribute type 6688f4c1f9bSThomas Graf * @nla: netlink attribute 6698f4c1f9bSThomas Graf */ 6708f4c1f9bSThomas Graf static inline int nla_type(const struct nlattr *nla) 6718f4c1f9bSThomas Graf { 6728f4c1f9bSThomas Graf return nla->nla_type & NLA_TYPE_MASK; 6738f4c1f9bSThomas Graf } 6748f4c1f9bSThomas Graf 6758f4c1f9bSThomas Graf /** 676bfa83a9eSThomas Graf * nla_data - head of payload 677bfa83a9eSThomas Graf * @nla: netlink attribute 678bfa83a9eSThomas Graf */ 679bfa83a9eSThomas Graf static inline void *nla_data(const struct nlattr *nla) 680bfa83a9eSThomas Graf { 681bfa83a9eSThomas Graf return (char *) nla + NLA_HDRLEN; 682bfa83a9eSThomas Graf } 683bfa83a9eSThomas Graf 684bfa83a9eSThomas Graf /** 685bfa83a9eSThomas Graf * nla_len - length of payload 686bfa83a9eSThomas Graf * @nla: netlink attribute 687bfa83a9eSThomas Graf */ 688bfa83a9eSThomas Graf static inline int nla_len(const struct nlattr *nla) 689bfa83a9eSThomas Graf { 690bfa83a9eSThomas Graf return nla->nla_len - NLA_HDRLEN; 691bfa83a9eSThomas Graf } 692bfa83a9eSThomas Graf 693bfa83a9eSThomas Graf /** 694bfa83a9eSThomas Graf * nla_ok - check if the netlink attribute fits into the remaining bytes 695bfa83a9eSThomas Graf * @nla: netlink attribute 696bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 697bfa83a9eSThomas Graf */ 698bfa83a9eSThomas Graf static inline int nla_ok(const struct nlattr *nla, int remaining) 699bfa83a9eSThomas Graf { 7001045b03eSVegard Nossum return remaining >= (int) sizeof(*nla) && 701bfa83a9eSThomas Graf nla->nla_len >= sizeof(*nla) && 702bfa83a9eSThomas Graf nla->nla_len <= remaining; 703bfa83a9eSThomas Graf } 704bfa83a9eSThomas Graf 705bfa83a9eSThomas Graf /** 706d1ec3b77SPierre Ynard * nla_next - next netlink attribute in attribute stream 707bfa83a9eSThomas Graf * @nla: netlink attribute 708bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 709bfa83a9eSThomas Graf * 710bfa83a9eSThomas Graf * Returns the next netlink attribute in the attribute stream and 711bfa83a9eSThomas Graf * decrements remaining by the size of the current attribute. 712bfa83a9eSThomas Graf */ 713bfa83a9eSThomas Graf static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) 714bfa83a9eSThomas Graf { 715bfa83a9eSThomas Graf int totlen = NLA_ALIGN(nla->nla_len); 716bfa83a9eSThomas Graf 717bfa83a9eSThomas Graf *remaining -= totlen; 718bfa83a9eSThomas Graf return (struct nlattr *) ((char *) nla + totlen); 719bfa83a9eSThomas Graf } 720bfa83a9eSThomas Graf 721bfa83a9eSThomas Graf /** 722fe4944e5SThomas Graf * nla_find_nested - find attribute in a set of nested attributes 723fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 724fe4944e5SThomas Graf * @attrtype: type of attribute to look for 725fe4944e5SThomas Graf * 726fe4944e5SThomas Graf * Returns the first attribute which matches the specified type. 727fe4944e5SThomas Graf */ 7283654654fSJan Engelhardt static inline struct nlattr * 7293654654fSJan Engelhardt nla_find_nested(const struct nlattr *nla, int attrtype) 730fe4944e5SThomas Graf { 731fe4944e5SThomas Graf return nla_find(nla_data(nla), nla_len(nla), attrtype); 732fe4944e5SThomas Graf } 733fe4944e5SThomas Graf 734fe4944e5SThomas Graf /** 735bfa83a9eSThomas Graf * nla_parse_nested - parse nested attributes 736bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 737bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 738bfa83a9eSThomas Graf * @nla: attribute containing the nested attributes 739bfa83a9eSThomas Graf * @policy: validation policy 740bfa83a9eSThomas Graf * 741bfa83a9eSThomas Graf * See nla_parse() 742bfa83a9eSThomas Graf */ 743bfa83a9eSThomas Graf static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, 744b057efd4SPatrick McHardy const struct nlattr *nla, 745ef7c79edSPatrick McHardy const struct nla_policy *policy) 746bfa83a9eSThomas Graf { 747bfa83a9eSThomas Graf return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy); 748bfa83a9eSThomas Graf } 7491092cb21SPatrick McHardy 7501092cb21SPatrick McHardy /** 751d1ec3b77SPierre Ynard * nla_put_u8 - Add a u8 netlink attribute to a socket buffer 752bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 753bfa83a9eSThomas Graf * @attrtype: attribute type 754bfa83a9eSThomas Graf * @value: numeric value 755bfa83a9eSThomas Graf */ 756bfa83a9eSThomas Graf static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) 757bfa83a9eSThomas Graf { 758bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u8), &value); 759bfa83a9eSThomas Graf } 760bfa83a9eSThomas Graf 761bfa83a9eSThomas Graf /** 762bfa83a9eSThomas Graf * nla_put_u16 - Add a u16 netlink attribute to a socket buffer 763bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 764bfa83a9eSThomas Graf * @attrtype: attribute type 765bfa83a9eSThomas Graf * @value: numeric value 766bfa83a9eSThomas Graf */ 767bfa83a9eSThomas Graf static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) 768bfa83a9eSThomas Graf { 769bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u16), &value); 770bfa83a9eSThomas Graf } 771bfa83a9eSThomas Graf 772bfa83a9eSThomas Graf /** 773569a8fc3SDavid S. Miller * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer 774569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 775569a8fc3SDavid S. Miller * @attrtype: attribute type 776569a8fc3SDavid S. Miller * @value: numeric value 777569a8fc3SDavid S. Miller */ 778569a8fc3SDavid S. Miller static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value) 779569a8fc3SDavid S. Miller { 780569a8fc3SDavid S. Miller return nla_put(skb, attrtype, sizeof(__be16), &value); 781569a8fc3SDavid S. Miller } 782569a8fc3SDavid S. Miller 783569a8fc3SDavid S. Miller /** 7846c1dd3b6SDavid S. Miller * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer 7856c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 7866c1dd3b6SDavid S. Miller * @attrtype: attribute type 7876c1dd3b6SDavid S. Miller * @value: numeric value 7886c1dd3b6SDavid S. Miller */ 7896c1dd3b6SDavid S. Miller static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value) 7906c1dd3b6SDavid S. Miller { 7916c1dd3b6SDavid S. Miller return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, value); 7926c1dd3b6SDavid S. Miller } 7936c1dd3b6SDavid S. Miller 7946c1dd3b6SDavid S. Miller /** 79524c410dcSDavid S. Miller * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer 79624c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 79724c410dcSDavid S. Miller * @attrtype: attribute type 79824c410dcSDavid S. Miller * @value: numeric value 79924c410dcSDavid S. Miller */ 80024c410dcSDavid S. Miller static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value) 80124c410dcSDavid S. Miller { 80224c410dcSDavid S. Miller return nla_put(skb, attrtype, sizeof(__le16), &value); 80324c410dcSDavid S. Miller } 80424c410dcSDavid S. Miller 80524c410dcSDavid S. Miller /** 806bfa83a9eSThomas Graf * nla_put_u32 - Add a u32 netlink attribute to a socket buffer 807bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 808bfa83a9eSThomas Graf * @attrtype: attribute type 809bfa83a9eSThomas Graf * @value: numeric value 810bfa83a9eSThomas Graf */ 811bfa83a9eSThomas Graf static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) 812bfa83a9eSThomas Graf { 813bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u32), &value); 814bfa83a9eSThomas Graf } 815bfa83a9eSThomas Graf 816bfa83a9eSThomas Graf /** 817569a8fc3SDavid S. Miller * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer 818569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 819569a8fc3SDavid S. Miller * @attrtype: attribute type 820569a8fc3SDavid S. Miller * @value: numeric value 821569a8fc3SDavid S. Miller */ 822569a8fc3SDavid S. Miller static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value) 823569a8fc3SDavid S. Miller { 824569a8fc3SDavid S. Miller return nla_put(skb, attrtype, sizeof(__be32), &value); 825569a8fc3SDavid S. Miller } 826569a8fc3SDavid S. Miller 827569a8fc3SDavid S. Miller /** 8286c1dd3b6SDavid S. Miller * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer 8296c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 8306c1dd3b6SDavid S. Miller * @attrtype: attribute type 8316c1dd3b6SDavid S. Miller * @value: numeric value 8326c1dd3b6SDavid S. Miller */ 8336c1dd3b6SDavid S. Miller static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value) 8346c1dd3b6SDavid S. Miller { 8356c1dd3b6SDavid S. Miller return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, value); 8366c1dd3b6SDavid S. Miller } 8376c1dd3b6SDavid S. Miller 8386c1dd3b6SDavid S. Miller /** 83924c410dcSDavid S. Miller * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer 84024c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 84124c410dcSDavid S. Miller * @attrtype: attribute type 84224c410dcSDavid S. Miller * @value: numeric value 84324c410dcSDavid S. Miller */ 84424c410dcSDavid S. Miller static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value) 84524c410dcSDavid S. Miller { 84624c410dcSDavid S. Miller return nla_put(skb, attrtype, sizeof(__le32), &value); 84724c410dcSDavid S. Miller } 84824c410dcSDavid S. Miller 84924c410dcSDavid S. Miller /** 850569a8fc3SDavid S. Miller * nla_put_u64 - Add a u64 netlink attribute to a socket buffer 851bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 852bfa83a9eSThomas Graf * @attrtype: attribute type 853bfa83a9eSThomas Graf * @value: numeric value 854bfa83a9eSThomas Graf */ 855bfa83a9eSThomas Graf static inline int nla_put_u64(struct sk_buff *skb, int attrtype, u64 value) 856bfa83a9eSThomas Graf { 857bfa83a9eSThomas Graf return nla_put(skb, attrtype, sizeof(u64), &value); 858bfa83a9eSThomas Graf } 859bfa83a9eSThomas Graf 860bfa83a9eSThomas Graf /** 861b46f6dedSNicolas Dichtel * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it 862569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 863569a8fc3SDavid S. Miller * @attrtype: attribute type 864569a8fc3SDavid S. Miller * @value: numeric value 865b46f6dedSNicolas Dichtel * @padattr: attribute type for the padding 866569a8fc3SDavid S. Miller */ 867b46f6dedSNicolas Dichtel static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value, 868b46f6dedSNicolas Dichtel int padattr) 869b46f6dedSNicolas Dichtel { 870b46f6dedSNicolas Dichtel return nla_put_64bit(skb, attrtype, sizeof(__be64), &value, padattr); 871b46f6dedSNicolas Dichtel } 872b46f6dedSNicolas Dichtel 873569a8fc3SDavid S. Miller /** 874e9bbe898SNicolas Dichtel * nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it 8756c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 8766c1dd3b6SDavid S. Miller * @attrtype: attribute type 8776c1dd3b6SDavid S. Miller * @value: numeric value 878e9bbe898SNicolas Dichtel * @padattr: attribute type for the padding 8796c1dd3b6SDavid S. Miller */ 880e9bbe898SNicolas Dichtel static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value, 881e9bbe898SNicolas Dichtel int padattr) 8826c1dd3b6SDavid S. Miller { 883e9bbe898SNicolas Dichtel return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, value, 884e9bbe898SNicolas Dichtel padattr); 8856c1dd3b6SDavid S. Miller } 8866c1dd3b6SDavid S. Miller 8876c1dd3b6SDavid S. Miller /** 888e7479122SNicolas Dichtel * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it 88924c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 89024c410dcSDavid S. Miller * @attrtype: attribute type 89124c410dcSDavid S. Miller * @value: numeric value 892e7479122SNicolas Dichtel * @padattr: attribute type for the padding 89324c410dcSDavid S. Miller */ 894e7479122SNicolas Dichtel static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value, 895e7479122SNicolas Dichtel int padattr) 89624c410dcSDavid S. Miller { 897e7479122SNicolas Dichtel return nla_put_64bit(skb, attrtype, sizeof(__le64), &value, padattr); 89824c410dcSDavid S. Miller } 89924c410dcSDavid S. Miller 90024c410dcSDavid S. Miller /** 9014778e0beSJiri Pirko * nla_put_s8 - Add a s8 netlink attribute to a socket buffer 9024778e0beSJiri Pirko * @skb: socket buffer to add attribute to 9034778e0beSJiri Pirko * @attrtype: attribute type 9044778e0beSJiri Pirko * @value: numeric value 9054778e0beSJiri Pirko */ 9064778e0beSJiri Pirko static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value) 9074778e0beSJiri Pirko { 9084778e0beSJiri Pirko return nla_put(skb, attrtype, sizeof(s8), &value); 9094778e0beSJiri Pirko } 9104778e0beSJiri Pirko 9114778e0beSJiri Pirko /** 9124778e0beSJiri Pirko * nla_put_s16 - Add a s16 netlink attribute to a socket buffer 9134778e0beSJiri Pirko * @skb: socket buffer to add attribute to 9144778e0beSJiri Pirko * @attrtype: attribute type 9154778e0beSJiri Pirko * @value: numeric value 9164778e0beSJiri Pirko */ 9174778e0beSJiri Pirko static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value) 9184778e0beSJiri Pirko { 9194778e0beSJiri Pirko return nla_put(skb, attrtype, sizeof(s16), &value); 9204778e0beSJiri Pirko } 9214778e0beSJiri Pirko 9224778e0beSJiri Pirko /** 9234778e0beSJiri Pirko * nla_put_s32 - Add a s32 netlink attribute to a socket buffer 9244778e0beSJiri Pirko * @skb: socket buffer to add attribute to 9254778e0beSJiri Pirko * @attrtype: attribute type 9264778e0beSJiri Pirko * @value: numeric value 9274778e0beSJiri Pirko */ 9284778e0beSJiri Pirko static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value) 9294778e0beSJiri Pirko { 9304778e0beSJiri Pirko return nla_put(skb, attrtype, sizeof(s32), &value); 9314778e0beSJiri Pirko } 9324778e0beSJiri Pirko 9334778e0beSJiri Pirko /** 934756a2f59SNicolas Dichtel * nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it 9354778e0beSJiri Pirko * @skb: socket buffer to add attribute to 9364778e0beSJiri Pirko * @attrtype: attribute type 9374778e0beSJiri Pirko * @value: numeric value 938756a2f59SNicolas Dichtel * @padattr: attribute type for the padding 9394778e0beSJiri Pirko */ 940756a2f59SNicolas Dichtel static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value, 941756a2f59SNicolas Dichtel int padattr) 9424778e0beSJiri Pirko { 943756a2f59SNicolas Dichtel return nla_put_64bit(skb, attrtype, sizeof(s64), &value, padattr); 9444778e0beSJiri Pirko } 9454778e0beSJiri Pirko 9464778e0beSJiri Pirko /** 947bfa83a9eSThomas Graf * nla_put_string - Add a string netlink attribute to a socket buffer 948bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 949bfa83a9eSThomas Graf * @attrtype: attribute type 950bfa83a9eSThomas Graf * @str: NUL terminated string 951bfa83a9eSThomas Graf */ 952bfa83a9eSThomas Graf static inline int nla_put_string(struct sk_buff *skb, int attrtype, 953bfa83a9eSThomas Graf const char *str) 954bfa83a9eSThomas Graf { 955bfa83a9eSThomas Graf return nla_put(skb, attrtype, strlen(str) + 1, str); 956bfa83a9eSThomas Graf } 957bfa83a9eSThomas Graf 958bfa83a9eSThomas Graf /** 959bfa83a9eSThomas Graf * nla_put_flag - Add a flag netlink attribute to a socket buffer 960bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 961bfa83a9eSThomas Graf * @attrtype: attribute type 962bfa83a9eSThomas Graf */ 963bfa83a9eSThomas Graf static inline int nla_put_flag(struct sk_buff *skb, int attrtype) 964bfa83a9eSThomas Graf { 965bfa83a9eSThomas Graf return nla_put(skb, attrtype, 0, NULL); 966bfa83a9eSThomas Graf } 967bfa83a9eSThomas Graf 968bfa83a9eSThomas Graf /** 9692175d87cSNicolas Dichtel * nla_put_msecs - Add a msecs netlink attribute to a skb and align it 970bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 971bfa83a9eSThomas Graf * @attrtype: attribute type 972d87de1f3SMark Rustad * @njiffies: number of jiffies to convert to msecs 9732175d87cSNicolas Dichtel * @padattr: attribute type for the padding 974bfa83a9eSThomas Graf */ 975bfa83a9eSThomas Graf static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, 9762175d87cSNicolas Dichtel unsigned long njiffies, int padattr) 977bfa83a9eSThomas Graf { 978d87de1f3SMark Rustad u64 tmp = jiffies_to_msecs(njiffies); 9792175d87cSNicolas Dichtel 9802175d87cSNicolas Dichtel return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); 981bfa83a9eSThomas Graf } 982bfa83a9eSThomas Graf 983bfa83a9eSThomas Graf /** 984930345eaSJiri Benc * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket 985930345eaSJiri Benc * buffer 986930345eaSJiri Benc * @skb: socket buffer to add attribute to 987930345eaSJiri Benc * @attrtype: attribute type 988930345eaSJiri Benc * @addr: IPv4 address 989930345eaSJiri Benc */ 990930345eaSJiri Benc static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype, 991930345eaSJiri Benc __be32 addr) 992930345eaSJiri Benc { 993930345eaSJiri Benc return nla_put_be32(skb, attrtype, addr); 994930345eaSJiri Benc } 995930345eaSJiri Benc 996930345eaSJiri Benc /** 997930345eaSJiri Benc * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket 998930345eaSJiri Benc * buffer 999930345eaSJiri Benc * @skb: socket buffer to add attribute to 1000930345eaSJiri Benc * @attrtype: attribute type 1001930345eaSJiri Benc * @addr: IPv6 address 1002930345eaSJiri Benc */ 1003930345eaSJiri Benc static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype, 1004930345eaSJiri Benc const struct in6_addr *addr) 1005930345eaSJiri Benc { 1006930345eaSJiri Benc return nla_put(skb, attrtype, sizeof(*addr), addr); 1007930345eaSJiri Benc } 1008930345eaSJiri Benc 1009930345eaSJiri Benc /** 1010bfa83a9eSThomas Graf * nla_get_u32 - return payload of u32 attribute 1011bfa83a9eSThomas Graf * @nla: u32 netlink attribute 1012bfa83a9eSThomas Graf */ 1013b057efd4SPatrick McHardy static inline u32 nla_get_u32(const struct nlattr *nla) 1014bfa83a9eSThomas Graf { 1015bfa83a9eSThomas Graf return *(u32 *) nla_data(nla); 1016bfa83a9eSThomas Graf } 1017bfa83a9eSThomas Graf 1018bfa83a9eSThomas Graf /** 101900012e5bSAl Viro * nla_get_be32 - return payload of __be32 attribute 102000012e5bSAl Viro * @nla: __be32 netlink attribute 102100012e5bSAl Viro */ 1022b057efd4SPatrick McHardy static inline __be32 nla_get_be32(const struct nlattr *nla) 102300012e5bSAl Viro { 102400012e5bSAl Viro return *(__be32 *) nla_data(nla); 102500012e5bSAl Viro } 102600012e5bSAl Viro 102700012e5bSAl Viro /** 1028c648a013SAlexander Aring * nla_get_le32 - return payload of __le32 attribute 1029c648a013SAlexander Aring * @nla: __le32 netlink attribute 1030c648a013SAlexander Aring */ 1031c648a013SAlexander Aring static inline __le32 nla_get_le32(const struct nlattr *nla) 1032c648a013SAlexander Aring { 1033c648a013SAlexander Aring return *(__le32 *) nla_data(nla); 1034c648a013SAlexander Aring } 1035c648a013SAlexander Aring 1036c648a013SAlexander Aring /** 1037bfa83a9eSThomas Graf * nla_get_u16 - return payload of u16 attribute 1038bfa83a9eSThomas Graf * @nla: u16 netlink attribute 1039bfa83a9eSThomas Graf */ 1040b057efd4SPatrick McHardy static inline u16 nla_get_u16(const struct nlattr *nla) 1041bfa83a9eSThomas Graf { 1042bfa83a9eSThomas Graf return *(u16 *) nla_data(nla); 1043bfa83a9eSThomas Graf } 1044bfa83a9eSThomas Graf 1045bfa83a9eSThomas Graf /** 1046838965baSPatrick McHardy * nla_get_be16 - return payload of __be16 attribute 1047838965baSPatrick McHardy * @nla: __be16 netlink attribute 1048838965baSPatrick McHardy */ 1049b057efd4SPatrick McHardy static inline __be16 nla_get_be16(const struct nlattr *nla) 1050838965baSPatrick McHardy { 1051838965baSPatrick McHardy return *(__be16 *) nla_data(nla); 1052838965baSPatrick McHardy } 1053838965baSPatrick McHardy 1054838965baSPatrick McHardy /** 10554a89c256SThomas Graf * nla_get_le16 - return payload of __le16 attribute 10564a89c256SThomas Graf * @nla: __le16 netlink attribute 10574a89c256SThomas Graf */ 1058b057efd4SPatrick McHardy static inline __le16 nla_get_le16(const struct nlattr *nla) 10594a89c256SThomas Graf { 10604a89c256SThomas Graf return *(__le16 *) nla_data(nla); 10614a89c256SThomas Graf } 10624a89c256SThomas Graf 10634a89c256SThomas Graf /** 1064bfa83a9eSThomas Graf * nla_get_u8 - return payload of u8 attribute 1065bfa83a9eSThomas Graf * @nla: u8 netlink attribute 1066bfa83a9eSThomas Graf */ 1067b057efd4SPatrick McHardy static inline u8 nla_get_u8(const struct nlattr *nla) 1068bfa83a9eSThomas Graf { 1069bfa83a9eSThomas Graf return *(u8 *) nla_data(nla); 1070bfa83a9eSThomas Graf } 1071bfa83a9eSThomas Graf 1072bfa83a9eSThomas Graf /** 1073bfa83a9eSThomas Graf * nla_get_u64 - return payload of u64 attribute 1074bfa83a9eSThomas Graf * @nla: u64 netlink attribute 1075bfa83a9eSThomas Graf */ 1076b057efd4SPatrick McHardy static inline u64 nla_get_u64(const struct nlattr *nla) 1077bfa83a9eSThomas Graf { 1078bfa83a9eSThomas Graf u64 tmp; 1079bfa83a9eSThomas Graf 1080bfa83a9eSThomas Graf nla_memcpy(&tmp, nla, sizeof(tmp)); 1081bfa83a9eSThomas Graf 1082bfa83a9eSThomas Graf return tmp; 1083bfa83a9eSThomas Graf } 1084bfa83a9eSThomas Graf 1085bfa83a9eSThomas Graf /** 1086a17c8598SPablo Neira Ayuso * nla_get_be64 - return payload of __be64 attribute 1087a17c8598SPablo Neira Ayuso * @nla: __be64 netlink attribute 1088a17c8598SPablo Neira Ayuso */ 1089a17c8598SPablo Neira Ayuso static inline __be64 nla_get_be64(const struct nlattr *nla) 1090a17c8598SPablo Neira Ayuso { 1091f5d410f2SPablo Neira Ayuso __be64 tmp; 1092f5d410f2SPablo Neira Ayuso 1093f5d410f2SPablo Neira Ayuso nla_memcpy(&tmp, nla, sizeof(tmp)); 1094f5d410f2SPablo Neira Ayuso 1095f5d410f2SPablo Neira Ayuso return tmp; 1096a17c8598SPablo Neira Ayuso } 1097a17c8598SPablo Neira Ayuso 1098a17c8598SPablo Neira Ayuso /** 1099c648a013SAlexander Aring * nla_get_le64 - return payload of __le64 attribute 1100c648a013SAlexander Aring * @nla: __le64 netlink attribute 1101c648a013SAlexander Aring */ 1102c648a013SAlexander Aring static inline __le64 nla_get_le64(const struct nlattr *nla) 1103c648a013SAlexander Aring { 1104c648a013SAlexander Aring return *(__le64 *) nla_data(nla); 1105c648a013SAlexander Aring } 1106c648a013SAlexander Aring 1107c648a013SAlexander Aring /** 11084778e0beSJiri Pirko * nla_get_s32 - return payload of s32 attribute 11094778e0beSJiri Pirko * @nla: s32 netlink attribute 11104778e0beSJiri Pirko */ 11114778e0beSJiri Pirko static inline s32 nla_get_s32(const struct nlattr *nla) 11124778e0beSJiri Pirko { 11134778e0beSJiri Pirko return *(s32 *) nla_data(nla); 11144778e0beSJiri Pirko } 11154778e0beSJiri Pirko 11164778e0beSJiri Pirko /** 11174778e0beSJiri Pirko * nla_get_s16 - return payload of s16 attribute 11184778e0beSJiri Pirko * @nla: s16 netlink attribute 11194778e0beSJiri Pirko */ 11204778e0beSJiri Pirko static inline s16 nla_get_s16(const struct nlattr *nla) 11214778e0beSJiri Pirko { 11224778e0beSJiri Pirko return *(s16 *) nla_data(nla); 11234778e0beSJiri Pirko } 11244778e0beSJiri Pirko 11254778e0beSJiri Pirko /** 11264778e0beSJiri Pirko * nla_get_s8 - return payload of s8 attribute 11274778e0beSJiri Pirko * @nla: s8 netlink attribute 11284778e0beSJiri Pirko */ 11294778e0beSJiri Pirko static inline s8 nla_get_s8(const struct nlattr *nla) 11304778e0beSJiri Pirko { 11314778e0beSJiri Pirko return *(s8 *) nla_data(nla); 11324778e0beSJiri Pirko } 11334778e0beSJiri Pirko 11344778e0beSJiri Pirko /** 11354778e0beSJiri Pirko * nla_get_s64 - return payload of s64 attribute 11364778e0beSJiri Pirko * @nla: s64 netlink attribute 11374778e0beSJiri Pirko */ 11384778e0beSJiri Pirko static inline s64 nla_get_s64(const struct nlattr *nla) 11394778e0beSJiri Pirko { 11404778e0beSJiri Pirko s64 tmp; 11414778e0beSJiri Pirko 11424778e0beSJiri Pirko nla_memcpy(&tmp, nla, sizeof(tmp)); 11434778e0beSJiri Pirko 11444778e0beSJiri Pirko return tmp; 11454778e0beSJiri Pirko } 11464778e0beSJiri Pirko 11474778e0beSJiri Pirko /** 1148bfa83a9eSThomas Graf * nla_get_flag - return payload of flag attribute 1149bfa83a9eSThomas Graf * @nla: flag netlink attribute 1150bfa83a9eSThomas Graf */ 1151b057efd4SPatrick McHardy static inline int nla_get_flag(const struct nlattr *nla) 1152bfa83a9eSThomas Graf { 1153bfa83a9eSThomas Graf return !!nla; 1154bfa83a9eSThomas Graf } 1155bfa83a9eSThomas Graf 1156bfa83a9eSThomas Graf /** 1157bfa83a9eSThomas Graf * nla_get_msecs - return payload of msecs attribute 1158bfa83a9eSThomas Graf * @nla: msecs netlink attribute 1159bfa83a9eSThomas Graf * 1160bfa83a9eSThomas Graf * Returns the number of milliseconds in jiffies. 1161bfa83a9eSThomas Graf */ 1162b057efd4SPatrick McHardy static inline unsigned long nla_get_msecs(const struct nlattr *nla) 1163bfa83a9eSThomas Graf { 1164bfa83a9eSThomas Graf u64 msecs = nla_get_u64(nla); 1165bfa83a9eSThomas Graf 1166bfa83a9eSThomas Graf return msecs_to_jiffies((unsigned long) msecs); 1167bfa83a9eSThomas Graf } 1168bfa83a9eSThomas Graf 1169bfa83a9eSThomas Graf /** 117067b61f6cSJiri Benc * nla_get_in_addr - return payload of IPv4 address attribute 117167b61f6cSJiri Benc * @nla: IPv4 address netlink attribute 117267b61f6cSJiri Benc */ 117367b61f6cSJiri Benc static inline __be32 nla_get_in_addr(const struct nlattr *nla) 117467b61f6cSJiri Benc { 117567b61f6cSJiri Benc return *(__be32 *) nla_data(nla); 117667b61f6cSJiri Benc } 117767b61f6cSJiri Benc 117867b61f6cSJiri Benc /** 117967b61f6cSJiri Benc * nla_get_in6_addr - return payload of IPv6 address attribute 118067b61f6cSJiri Benc * @nla: IPv6 address netlink attribute 118167b61f6cSJiri Benc */ 118267b61f6cSJiri Benc static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla) 118367b61f6cSJiri Benc { 118467b61f6cSJiri Benc struct in6_addr tmp; 118567b61f6cSJiri Benc 118667b61f6cSJiri Benc nla_memcpy(&tmp, nla, sizeof(tmp)); 118767b61f6cSJiri Benc return tmp; 118867b61f6cSJiri Benc } 118967b61f6cSJiri Benc 119067b61f6cSJiri Benc /** 1191bfa83a9eSThomas Graf * nla_nest_start - Start a new level of nested attributes 1192bfa83a9eSThomas Graf * @skb: socket buffer to add attributes to 1193bfa83a9eSThomas Graf * @attrtype: attribute type of container 1194bfa83a9eSThomas Graf * 1195bfa83a9eSThomas Graf * Returns the container attribute 1196bfa83a9eSThomas Graf */ 1197bfa83a9eSThomas Graf static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) 1198bfa83a9eSThomas Graf { 119927a884dcSArnaldo Carvalho de Melo struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); 1200bfa83a9eSThomas Graf 1201bfa83a9eSThomas Graf if (nla_put(skb, attrtype, 0, NULL) < 0) 1202bfa83a9eSThomas Graf return NULL; 1203bfa83a9eSThomas Graf 1204bfa83a9eSThomas Graf return start; 1205bfa83a9eSThomas Graf } 1206bfa83a9eSThomas Graf 1207bfa83a9eSThomas Graf /** 1208bfa83a9eSThomas Graf * nla_nest_end - Finalize nesting of attributes 1209d1ec3b77SPierre Ynard * @skb: socket buffer the attributes are stored in 1210bfa83a9eSThomas Graf * @start: container attribute 1211bfa83a9eSThomas Graf * 1212bfa83a9eSThomas Graf * Corrects the container attribute header to include the all 1213bfa83a9eSThomas Graf * appeneded attributes. 1214bfa83a9eSThomas Graf * 1215bfa83a9eSThomas Graf * Returns the total data length of the skb. 1216bfa83a9eSThomas Graf */ 1217bfa83a9eSThomas Graf static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) 1218bfa83a9eSThomas Graf { 121927a884dcSArnaldo Carvalho de Melo start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; 1220bfa83a9eSThomas Graf return skb->len; 1221bfa83a9eSThomas Graf } 1222bfa83a9eSThomas Graf 1223bfa83a9eSThomas Graf /** 1224bfa83a9eSThomas Graf * nla_nest_cancel - Cancel nesting of attributes 1225bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 1226bfa83a9eSThomas Graf * @start: container attribute 1227bfa83a9eSThomas Graf * 1228bfa83a9eSThomas Graf * Removes the container attribute and including all nested 1229bc3ed28cSThomas Graf * attributes. Returns -EMSGSIZE 1230bfa83a9eSThomas Graf */ 1231bc3ed28cSThomas Graf static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) 1232bfa83a9eSThomas Graf { 1233bc3ed28cSThomas Graf nlmsg_trim(skb, start); 1234bfa83a9eSThomas Graf } 1235bfa83a9eSThomas Graf 1236bfa83a9eSThomas Graf /** 12374fe5d5c0SPaul Moore * nla_validate_nested - Validate a stream of nested attributes 12384fe5d5c0SPaul Moore * @start: container attribute 12394fe5d5c0SPaul Moore * @maxtype: maximum attribute type to be expected 12404fe5d5c0SPaul Moore * @policy: validation policy 12414fe5d5c0SPaul Moore * 12424fe5d5c0SPaul Moore * Validates all attributes in the nested attribute stream against the 12434fe5d5c0SPaul Moore * specified policy. Attributes with a type exceeding maxtype will be 12444fe5d5c0SPaul Moore * ignored. See documenation of struct nla_policy for more details. 12454fe5d5c0SPaul Moore * 12464fe5d5c0SPaul Moore * Returns 0 on success or a negative error code. 12474fe5d5c0SPaul Moore */ 12483654654fSJan Engelhardt static inline int nla_validate_nested(const struct nlattr *start, int maxtype, 1249ef7c79edSPatrick McHardy const struct nla_policy *policy) 12504fe5d5c0SPaul Moore { 12514fe5d5c0SPaul Moore return nla_validate(nla_data(start), nla_len(start), maxtype, policy); 12524fe5d5c0SPaul Moore } 12534fe5d5c0SPaul Moore 12544fe5d5c0SPaul Moore /** 1255089bf1a6SNicolas Dichtel * nla_need_padding_for_64bit - test 64-bit alignment of the next attribute 1256089bf1a6SNicolas Dichtel * @skb: socket buffer the message is stored in 1257089bf1a6SNicolas Dichtel * 1258089bf1a6SNicolas Dichtel * Return true if padding is needed to align the next attribute (nla_data()) to 1259089bf1a6SNicolas Dichtel * a 64-bit aligned area. 1260089bf1a6SNicolas Dichtel */ 1261089bf1a6SNicolas Dichtel static inline bool nla_need_padding_for_64bit(struct sk_buff *skb) 1262089bf1a6SNicolas Dichtel { 1263089bf1a6SNicolas Dichtel #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 1264089bf1a6SNicolas Dichtel /* The nlattr header is 4 bytes in size, that's why we test 1265089bf1a6SNicolas Dichtel * if the skb->data _is_ aligned. A NOP attribute, plus 1266089bf1a6SNicolas Dichtel * nlattr header for next attribute, will make nla_data() 1267089bf1a6SNicolas Dichtel * 8-byte aligned. 1268089bf1a6SNicolas Dichtel */ 1269089bf1a6SNicolas Dichtel if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8)) 1270089bf1a6SNicolas Dichtel return true; 1271089bf1a6SNicolas Dichtel #endif 1272089bf1a6SNicolas Dichtel return false; 1273089bf1a6SNicolas Dichtel } 1274089bf1a6SNicolas Dichtel 1275089bf1a6SNicolas Dichtel /** 127635c58459SDavid S. Miller * nla_align_64bit - 64-bit align the nla_data() of next attribute 127735c58459SDavid S. Miller * @skb: socket buffer the message is stored in 127835c58459SDavid S. Miller * @padattr: attribute type for the padding 127935c58459SDavid S. Miller * 128035c58459SDavid S. Miller * Conditionally emit a padding netlink attribute in order to make 128135c58459SDavid S. Miller * the next attribute we emit have a 64-bit aligned nla_data() area. 128235c58459SDavid S. Miller * This will only be done in architectures which do not have 1283cca1d815SEric Dumazet * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined. 128435c58459SDavid S. Miller * 128535c58459SDavid S. Miller * Returns zero on success or a negative error code. 128635c58459SDavid S. Miller */ 128735c58459SDavid S. Miller static inline int nla_align_64bit(struct sk_buff *skb, int padattr) 128835c58459SDavid S. Miller { 1289089bf1a6SNicolas Dichtel if (nla_need_padding_for_64bit(skb) && 1290cca1d815SEric Dumazet !nla_reserve(skb, padattr, 0)) 129135c58459SDavid S. Miller return -EMSGSIZE; 1292089bf1a6SNicolas Dichtel 129335c58459SDavid S. Miller return 0; 129435c58459SDavid S. Miller } 129535c58459SDavid S. Miller 129635c58459SDavid S. Miller /** 129735c58459SDavid S. Miller * nla_total_size_64bit - total length of attribute including padding 129835c58459SDavid S. Miller * @payload: length of payload 129935c58459SDavid S. Miller */ 130035c58459SDavid S. Miller static inline int nla_total_size_64bit(int payload) 130135c58459SDavid S. Miller { 130235c58459SDavid S. Miller return NLA_ALIGN(nla_attr_size(payload)) 1303cca1d815SEric Dumazet #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 130435c58459SDavid S. Miller + NLA_ALIGN(nla_attr_size(0)) 130535c58459SDavid S. Miller #endif 130635c58459SDavid S. Miller ; 130735c58459SDavid S. Miller } 130835c58459SDavid S. Miller 130935c58459SDavid S. Miller /** 1310bfa83a9eSThomas Graf * nla_for_each_attr - iterate over a stream of attributes 1311bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 1312bfa83a9eSThomas Graf * @head: head of attribute stream 1313bfa83a9eSThomas Graf * @len: length of attribute stream 1314bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 1315bfa83a9eSThomas Graf */ 1316bfa83a9eSThomas Graf #define nla_for_each_attr(pos, head, len, rem) \ 1317bfa83a9eSThomas Graf for (pos = head, rem = len; \ 1318bfa83a9eSThomas Graf nla_ok(pos, rem); \ 1319bfa83a9eSThomas Graf pos = nla_next(pos, &(rem))) 1320bfa83a9eSThomas Graf 1321fe4944e5SThomas Graf /** 1322fe4944e5SThomas Graf * nla_for_each_nested - iterate over nested attributes 1323fe4944e5SThomas Graf * @pos: loop counter, set to current attribute 1324fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 1325fe4944e5SThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 1326fe4944e5SThomas Graf */ 1327fe4944e5SThomas Graf #define nla_for_each_nested(pos, nla, rem) \ 1328fe4944e5SThomas Graf nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) 1329fe4944e5SThomas Graf 1330941d8ebcSSimon Horman /** 1331941d8ebcSSimon Horman * nla_is_last - Test if attribute is last in stream 1332941d8ebcSSimon Horman * @nla: attribute to test 1333941d8ebcSSimon Horman * @rem: bytes remaining in stream 1334941d8ebcSSimon Horman */ 1335941d8ebcSSimon Horman static inline bool nla_is_last(const struct nlattr *nla, int rem) 1336941d8ebcSSimon Horman { 1337941d8ebcSSimon Horman return nla->nla_len == rem; 1338941d8ebcSSimon Horman } 1339941d8ebcSSimon Horman 1340bfa83a9eSThomas Graf #endif 1341