1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2bfa83a9eSThomas Graf #ifndef __NET_NETLINK_H 3bfa83a9eSThomas Graf #define __NET_NETLINK_H 4bfa83a9eSThomas Graf 5bfa83a9eSThomas Graf #include <linux/types.h> 6bfa83a9eSThomas Graf #include <linux/netlink.h> 7d7fe0f24SAl Viro #include <linux/jiffies.h> 8930345eaSJiri Benc #include <linux/in6.h> 9bfa83a9eSThomas Graf 10bfa83a9eSThomas Graf /* ======================================================================== 11bfa83a9eSThomas Graf * Netlink Messages and Attributes Interface (As Seen On TV) 12bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 13bfa83a9eSThomas Graf * Messages Interface 14bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 15bfa83a9eSThomas Graf * 16bfa83a9eSThomas Graf * Message Format: 17bfa83a9eSThomas Graf * <--- nlmsg_total_size(payload) ---> 18bfa83a9eSThomas Graf * <-- nlmsg_msg_size(payload) -> 19bfa83a9eSThomas Graf * +----------+- - -+-------------+- - -+-------- - - 20bfa83a9eSThomas Graf * | nlmsghdr | Pad | Payload | Pad | nlmsghdr 21bfa83a9eSThomas Graf * +----------+- - -+-------------+- - -+-------- - - 22bfa83a9eSThomas Graf * nlmsg_data(nlh)---^ ^ 23bfa83a9eSThomas Graf * nlmsg_next(nlh)-----------------------+ 24bfa83a9eSThomas Graf * 25bfa83a9eSThomas Graf * Payload Format: 26bfa83a9eSThomas Graf * <---------------------- nlmsg_len(nlh) ---------------------> 27bfa83a9eSThomas Graf * <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) -> 28bfa83a9eSThomas Graf * +----------------------+- - -+--------------------------------+ 29bfa83a9eSThomas Graf * | Family Header | Pad | Attributes | 30bfa83a9eSThomas Graf * +----------------------+- - -+--------------------------------+ 31bfa83a9eSThomas Graf * nlmsg_attrdata(nlh, hdrlen)---^ 32bfa83a9eSThomas Graf * 33bfa83a9eSThomas Graf * Data Structures: 34bfa83a9eSThomas Graf * struct nlmsghdr netlink message header 35bfa83a9eSThomas Graf * 36bfa83a9eSThomas Graf * Message Construction: 37bfa83a9eSThomas Graf * nlmsg_new() create a new netlink message 38bfa83a9eSThomas Graf * nlmsg_put() add a netlink message to an skb 39bfa83a9eSThomas Graf * nlmsg_put_answer() callback based nlmsg_put() 401dc8d8c0SJustin P. Mattock * nlmsg_end() finalize netlink message 41fe4944e5SThomas Graf * nlmsg_get_pos() return current position in message 42fe4944e5SThomas Graf * nlmsg_trim() trim part of message 43bfa83a9eSThomas Graf * nlmsg_cancel() cancel message construction 44bfa83a9eSThomas Graf * nlmsg_free() free a netlink message 45bfa83a9eSThomas Graf * 46bfa83a9eSThomas Graf * Message Sending: 47bfa83a9eSThomas Graf * nlmsg_multicast() multicast message to several groups 48bfa83a9eSThomas Graf * nlmsg_unicast() unicast a message to a single socket 49d387f6adSThomas Graf * nlmsg_notify() send notification message 50bfa83a9eSThomas Graf * 51bfa83a9eSThomas Graf * Message Length Calculations: 52bfa83a9eSThomas Graf * nlmsg_msg_size(payload) length of message w/o padding 53bfa83a9eSThomas Graf * nlmsg_total_size(payload) length of message w/ padding 54bfa83a9eSThomas Graf * nlmsg_padlen(payload) length of padding at tail 55bfa83a9eSThomas Graf * 56bfa83a9eSThomas Graf * Message Payload Access: 57bfa83a9eSThomas Graf * nlmsg_data(nlh) head of message payload 58bfa83a9eSThomas Graf * nlmsg_len(nlh) length of message payload 59bfa83a9eSThomas Graf * nlmsg_attrdata(nlh, hdrlen) head of attributes data 60bfa83a9eSThomas Graf * nlmsg_attrlen(nlh, hdrlen) length of attributes data 61bfa83a9eSThomas Graf * 62bfa83a9eSThomas Graf * Message Parsing: 63bfa83a9eSThomas Graf * nlmsg_ok(nlh, remaining) does nlh fit into remaining bytes? 64bfa83a9eSThomas Graf * nlmsg_next(nlh, remaining) get next netlink message 65bfa83a9eSThomas Graf * nlmsg_parse() parse attributes of a message 66bfa83a9eSThomas Graf * nlmsg_find_attr() find an attribute in a message 67bfa83a9eSThomas Graf * nlmsg_for_each_msg() loop over all messages 68bfa83a9eSThomas Graf * nlmsg_validate() validate netlink message incl. attrs 69bfa83a9eSThomas Graf * nlmsg_for_each_attr() loop over all attributes 70bfa83a9eSThomas Graf * 7197676b6bSThomas Graf * Misc: 7297676b6bSThomas Graf * nlmsg_report() report back to application? 7397676b6bSThomas Graf * 74bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 75bfa83a9eSThomas Graf * Attributes Interface 76bfa83a9eSThomas Graf * ------------------------------------------------------------------------ 77bfa83a9eSThomas Graf * 78bfa83a9eSThomas Graf * Attribute Format: 79bfa83a9eSThomas Graf * <------- nla_total_size(payload) -------> 80bfa83a9eSThomas Graf * <---- nla_attr_size(payload) -----> 81bfa83a9eSThomas Graf * +----------+- - -+- - - - - - - - - +- - -+-------- - - 82bfa83a9eSThomas Graf * | Header | Pad | Payload | Pad | Header 83bfa83a9eSThomas Graf * +----------+- - -+- - - - - - - - - +- - -+-------- - - 84bfa83a9eSThomas Graf * <- nla_len(nla) -> ^ 85bfa83a9eSThomas Graf * nla_data(nla)----^ | 86bfa83a9eSThomas Graf * nla_next(nla)-----------------------------' 87bfa83a9eSThomas Graf * 88bfa83a9eSThomas Graf * Data Structures: 89d1ec3b77SPierre Ynard * struct nlattr netlink attribute header 90bfa83a9eSThomas Graf * 91bfa83a9eSThomas Graf * Attribute Construction: 92fe4944e5SThomas Graf * nla_reserve(skb, type, len) reserve room for an attribute 93fe4944e5SThomas Graf * nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr 94bfa83a9eSThomas Graf * nla_put(skb, type, len, data) add attribute to skb 95fe4944e5SThomas Graf * nla_put_nohdr(skb, len, data) add attribute w/o hdr 9601480e1cSPatrick McHardy * nla_append(skb, len, data) append data to skb 97bfa83a9eSThomas Graf * 98bfa83a9eSThomas Graf * Attribute Construction for Basic Types: 99bfa83a9eSThomas Graf * nla_put_u8(skb, type, value) add u8 attribute to skb 100bfa83a9eSThomas Graf * nla_put_u16(skb, type, value) add u16 attribute to skb 101bfa83a9eSThomas Graf * nla_put_u32(skb, type, value) add u32 attribute to skb 10226837012SRolf Eike Beer * nla_put_u64_64bit(skb, type, 10350225243SNicolas Dichtel * value, padattr) add u64 attribute to skb 1044778e0beSJiri Pirko * nla_put_s8(skb, type, value) add s8 attribute to skb 1054778e0beSJiri Pirko * nla_put_s16(skb, type, value) add s16 attribute to skb 1064778e0beSJiri Pirko * nla_put_s32(skb, type, value) add s32 attribute to skb 107756a2f59SNicolas Dichtel * nla_put_s64(skb, type, value, 108756a2f59SNicolas Dichtel * padattr) add s64 attribute to skb 109bfa83a9eSThomas Graf * nla_put_string(skb, type, str) add string attribute to skb 110bfa83a9eSThomas Graf * nla_put_flag(skb, type) add flag attribute to skb 1112175d87cSNicolas Dichtel * nla_put_msecs(skb, type, jiffies, 1122175d87cSNicolas Dichtel * padattr) add msecs attribute to skb 113930345eaSJiri Benc * nla_put_in_addr(skb, type, addr) add IPv4 address attribute to skb 114930345eaSJiri Benc * nla_put_in6_addr(skb, type, addr) add IPv6 address attribute to skb 115bfa83a9eSThomas Graf * 116bfa83a9eSThomas Graf * Nested Attributes Construction: 117bfa83a9eSThomas Graf * nla_nest_start(skb, type) start a nested attribute 118bfa83a9eSThomas Graf * nla_nest_end(skb, nla) finalize a nested attribute 119bfa83a9eSThomas Graf * nla_nest_cancel(skb, nla) cancel nested attribute construction 120bfa83a9eSThomas Graf * 121bfa83a9eSThomas Graf * Attribute Length Calculations: 122bfa83a9eSThomas Graf * nla_attr_size(payload) length of attribute w/o padding 123bfa83a9eSThomas Graf * nla_total_size(payload) length of attribute w/ padding 124bfa83a9eSThomas Graf * nla_padlen(payload) length of padding 125bfa83a9eSThomas Graf * 126bfa83a9eSThomas Graf * Attribute Payload Access: 127bfa83a9eSThomas Graf * nla_data(nla) head of attribute payload 128bfa83a9eSThomas Graf * nla_len(nla) length of attribute payload 129bfa83a9eSThomas Graf * 130bfa83a9eSThomas Graf * Attribute Payload Access for Basic Types: 131bfa83a9eSThomas Graf * nla_get_u8(nla) get payload for a u8 attribute 132bfa83a9eSThomas Graf * nla_get_u16(nla) get payload for a u16 attribute 133bfa83a9eSThomas Graf * nla_get_u32(nla) get payload for a u32 attribute 134bfa83a9eSThomas Graf * nla_get_u64(nla) get payload for a u64 attribute 1354778e0beSJiri Pirko * nla_get_s8(nla) get payload for a s8 attribute 1364778e0beSJiri Pirko * nla_get_s16(nla) get payload for a s16 attribute 1374778e0beSJiri Pirko * nla_get_s32(nla) get payload for a s32 attribute 1384778e0beSJiri Pirko * nla_get_s64(nla) get payload for a s64 attribute 139bfa83a9eSThomas Graf * nla_get_flag(nla) return 1 if flag is true 140bfa83a9eSThomas Graf * nla_get_msecs(nla) get payload for a msecs attribute 141bfa83a9eSThomas Graf * 142bfa83a9eSThomas Graf * Attribute Misc: 143bfa83a9eSThomas Graf * nla_memcpy(dest, nla, count) copy attribute into memory 144bfa83a9eSThomas Graf * nla_memcmp(nla, data, size) compare attribute with memory area 145bfa83a9eSThomas Graf * nla_strlcpy(dst, nla, size) copy attribute to a sized string 146bfa83a9eSThomas Graf * nla_strcmp(nla, str) compare attribute with string 147bfa83a9eSThomas Graf * 148bfa83a9eSThomas Graf * Attribute Parsing: 149bfa83a9eSThomas Graf * nla_ok(nla, remaining) does nla fit into remaining bytes? 150bfa83a9eSThomas Graf * nla_next(nla, remaining) get next netlink attribute 151bfa83a9eSThomas Graf * nla_validate() validate a stream of attributes 1524fe5d5c0SPaul Moore * nla_validate_nested() validate a stream of nested attributes 153bfa83a9eSThomas Graf * nla_find() find attribute in stream of attributes 154fe4944e5SThomas Graf * nla_find_nested() find attribute in nested attributes 155bfa83a9eSThomas Graf * nla_parse() parse and validate stream of attrs 15643955a45SJohannes Berg * nla_parse_nested() parse nested attributes 157bfa83a9eSThomas Graf * nla_for_each_attr() loop over all attributes 15822acb19aSPaul Moore * nla_for_each_nested() loop over the nested attributes 159bfa83a9eSThomas Graf *========================================================================= 160bfa83a9eSThomas Graf */ 161bfa83a9eSThomas Graf 162bfa83a9eSThomas Graf /** 163bfa83a9eSThomas Graf * Standard attribute types to specify validation policy 164bfa83a9eSThomas Graf */ 165bfa83a9eSThomas Graf enum { 166bfa83a9eSThomas Graf NLA_UNSPEC, 167bfa83a9eSThomas Graf NLA_U8, 168bfa83a9eSThomas Graf NLA_U16, 169bfa83a9eSThomas Graf NLA_U32, 170bfa83a9eSThomas Graf NLA_U64, 171bfa83a9eSThomas Graf NLA_STRING, 172bfa83a9eSThomas Graf NLA_FLAG, 173bfa83a9eSThomas Graf NLA_MSECS, 174bfa83a9eSThomas Graf NLA_NESTED, 1751501d135SJohannes Berg NLA_NESTED_ARRAY, 176a5531a5dSThomas Graf NLA_NUL_STRING, 177d30045a0SJohannes Berg NLA_BINARY, 1784778e0beSJiri Pirko NLA_S8, 1794778e0beSJiri Pirko NLA_S16, 1804778e0beSJiri Pirko NLA_S32, 1814778e0beSJiri Pirko NLA_S64, 18264c83d83SJamal Hadi Salim NLA_BITFIELD32, 183568b742aSJohannes Berg NLA_REJECT, 184b60b87fcSJohannes Berg NLA_EXACT_LEN, 185b60b87fcSJohannes Berg NLA_EXACT_LEN_WARN, 186bfa83a9eSThomas Graf __NLA_TYPE_MAX, 187bfa83a9eSThomas Graf }; 188bfa83a9eSThomas Graf 189bfa83a9eSThomas Graf #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) 190bfa83a9eSThomas Graf 1913e48be05SJohannes Berg enum nla_policy_validation { 1923e48be05SJohannes Berg NLA_VALIDATE_NONE, 1933e48be05SJohannes Berg NLA_VALIDATE_RANGE, 1943e48be05SJohannes Berg NLA_VALIDATE_MIN, 1953e48be05SJohannes Berg NLA_VALIDATE_MAX, 19633188bd6SJohannes Berg NLA_VALIDATE_FUNCTION, 1973e48be05SJohannes Berg }; 1983e48be05SJohannes Berg 199bfa83a9eSThomas Graf /** 200bfa83a9eSThomas Graf * struct nla_policy - attribute validation policy 201bfa83a9eSThomas Graf * @type: Type of attribute or NLA_UNSPEC 2023e48be05SJohannes Berg * @validation_type: type of attribute validation done in addition to 20333188bd6SJohannes Berg * type-specific validation (e.g. range, function call), see 2043e48be05SJohannes Berg * &enum nla_policy_validation 205a5531a5dSThomas Graf * @len: Type specific length of payload 206bfa83a9eSThomas Graf * 207bfa83a9eSThomas Graf * Policies are defined as arrays of this struct, the array must be 208bfa83a9eSThomas Graf * accessible by attribute type up to the highest identifier to be expected. 209bfa83a9eSThomas Graf * 210a5531a5dSThomas Graf * Meaning of `len' field: 211a5531a5dSThomas Graf * NLA_STRING Maximum length of string 212a5531a5dSThomas Graf * NLA_NUL_STRING Maximum length of string (excluding NUL) 213a5531a5dSThomas Graf * NLA_FLAG Unused 214d30045a0SJohannes Berg * NLA_BINARY Maximum length of attribute payload 2151501d135SJohannes Berg * NLA_NESTED, 2161501d135SJohannes Berg * NLA_NESTED_ARRAY Length verification is done by checking len of 2179a659a35SJohannes Berg * nested header (or empty); len field is used if 2189a659a35SJohannes Berg * validation_data is also used, for the max attr 2199a659a35SJohannes Berg * number in the nested policy. 2204b6cc728SJohannes Berg * NLA_U8, NLA_U16, 2214b6cc728SJohannes Berg * NLA_U32, NLA_U64, 2224778e0beSJiri Pirko * NLA_S8, NLA_S16, 2234778e0beSJiri Pirko * NLA_S32, NLA_S64, 2244b6cc728SJohannes Berg * NLA_MSECS Leaving the length field zero will verify the 2254b6cc728SJohannes Berg * given type fits, using it verifies minimum length 2264b6cc728SJohannes Berg * just like "All other" 227568b742aSJohannes Berg * NLA_BITFIELD32 Unused 228568b742aSJohannes Berg * NLA_REJECT Unused 229b60b87fcSJohannes Berg * NLA_EXACT_LEN Attribute must have exactly this length, otherwise 230b60b87fcSJohannes Berg * it is rejected. 231b60b87fcSJohannes Berg * NLA_EXACT_LEN_WARN Attribute should have exactly this length, a warning 232b60b87fcSJohannes Berg * is logged if it is longer, shorter is rejected. 2334b6cc728SJohannes Berg * All other Minimum length of attribute payload 234a5531a5dSThomas Graf * 235568b742aSJohannes Berg * Meaning of `validation_data' field: 236568b742aSJohannes Berg * NLA_BITFIELD32 This is a 32-bit bitmap/bitselector attribute and 237568b742aSJohannes Berg * validation data must point to a u32 value of valid 238568b742aSJohannes Berg * flags 239568b742aSJohannes Berg * NLA_REJECT This attribute is always rejected and validation data 240568b742aSJohannes Berg * may point to a string to report as the error instead 241568b742aSJohannes Berg * of the generic one in extended ACK. 2429a659a35SJohannes Berg * NLA_NESTED Points to a nested policy to validate, must also set 2439a659a35SJohannes Berg * `len' to the max attribute number. 2449a659a35SJohannes Berg * Note that nla_parse() will validate, but of course not 2459a659a35SJohannes Berg * parse, the nested sub-policies. 2461501d135SJohannes Berg * NLA_NESTED_ARRAY Points to a nested policy to validate, must also set 2471501d135SJohannes Berg * `len' to the max attribute number. The difference to 2481501d135SJohannes Berg * NLA_NESTED is the structure - NLA_NESTED has the 2491501d135SJohannes Berg * nested attributes directly inside, while an array has 2501501d135SJohannes Berg * the nested attributes at another level down and the 2511501d135SJohannes Berg * attributes directly in the nesting don't matter. 2523e48be05SJohannes Berg * All other Unused - but note that it's a union 2533e48be05SJohannes Berg * 2543e48be05SJohannes Berg * Meaning of `min' and `max' fields, use via NLA_POLICY_MIN, NLA_POLICY_MAX 2553e48be05SJohannes Berg * and NLA_POLICY_RANGE: 2563e48be05SJohannes Berg * NLA_U8, 2573e48be05SJohannes Berg * NLA_U16, 2583e48be05SJohannes Berg * NLA_U32, 2593e48be05SJohannes Berg * NLA_U64, 2603e48be05SJohannes Berg * NLA_S8, 2613e48be05SJohannes Berg * NLA_S16, 2623e48be05SJohannes Berg * NLA_S32, 2633e48be05SJohannes Berg * NLA_S64 These are used depending on the validation_type 2643e48be05SJohannes Berg * field, if that is min/max/range then the minimum, 2653e48be05SJohannes Berg * maximum and both are used (respectively) to check 2663e48be05SJohannes Berg * the value of the integer attribute. 2673e48be05SJohannes Berg * Note that in the interest of code simplicity and 2683e48be05SJohannes Berg * struct size both limits are s16, so you cannot 2693e48be05SJohannes Berg * enforce a range that doesn't fall within the range 2703e48be05SJohannes Berg * of s16 - do that as usual in the code instead. 2713e48be05SJohannes Berg * All other Unused - but note that it's a union 272568b742aSJohannes Berg * 27333188bd6SJohannes Berg * Meaning of `validate' field, use via NLA_POLICY_VALIDATE_FN: 27433188bd6SJohannes Berg * NLA_BINARY Validation function called for the attribute, 27533188bd6SJohannes Berg * not compatible with use of the validation_data 27633188bd6SJohannes Berg * as in NLA_BITFIELD32, NLA_REJECT, NLA_NESTED and 27733188bd6SJohannes Berg * NLA_NESTED_ARRAY. 27833188bd6SJohannes Berg * All other Unused - but note that it's a union 27933188bd6SJohannes Berg * 280bfa83a9eSThomas Graf * Example: 281b54452b0SAlexey Dobriyan * static const struct nla_policy my_policy[ATTR_MAX+1] = { 282bfa83a9eSThomas Graf * [ATTR_FOO] = { .type = NLA_U16 }, 283d30045a0SJohannes Berg * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ }, 284a5531a5dSThomas Graf * [ATTR_BAZ] = { .len = sizeof(struct mystruct) }, 28564c83d83SJamal Hadi Salim * [ATTR_GOO] = { .type = NLA_BITFIELD32, .validation_data = &myvalidflags }, 286bfa83a9eSThomas Graf * }; 287bfa83a9eSThomas Graf */ 288bfa83a9eSThomas Graf struct nla_policy { 2893e48be05SJohannes Berg u8 type; 2903e48be05SJohannes Berg u8 validation_type; 291a5531a5dSThomas Graf u16 len; 2923e48be05SJohannes Berg union { 29348fde90aSJohannes Berg const void *validation_data; 2943e48be05SJohannes Berg struct { 2953e48be05SJohannes Berg s16 min, max; 2963e48be05SJohannes Berg }; 29733188bd6SJohannes Berg int (*validate)(const struct nlattr *attr, 29833188bd6SJohannes Berg struct netlink_ext_ack *extack); 2993e48be05SJohannes Berg }; 300bfa83a9eSThomas Graf }; 301bfa83a9eSThomas Graf 302b60b87fcSJohannes Berg #define NLA_POLICY_EXACT_LEN(_len) { .type = NLA_EXACT_LEN, .len = _len } 303b60b87fcSJohannes Berg #define NLA_POLICY_EXACT_LEN_WARN(_len) { .type = NLA_EXACT_LEN_WARN, \ 304b60b87fcSJohannes Berg .len = _len } 305b60b87fcSJohannes Berg 306b60b87fcSJohannes Berg #define NLA_POLICY_ETH_ADDR NLA_POLICY_EXACT_LEN(ETH_ALEN) 307b60b87fcSJohannes Berg #define NLA_POLICY_ETH_ADDR_COMPAT NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN) 308b60b87fcSJohannes Berg 3099a659a35SJohannes Berg #define NLA_POLICY_NESTED(maxattr, policy) \ 3109a659a35SJohannes Berg { .type = NLA_NESTED, .validation_data = policy, .len = maxattr } 3111501d135SJohannes Berg #define NLA_POLICY_NESTED_ARRAY(maxattr, policy) \ 3121501d135SJohannes Berg { .type = NLA_NESTED_ARRAY, .validation_data = policy, .len = maxattr } 3139a659a35SJohannes Berg 3143e48be05SJohannes Berg #define __NLA_ENSURE(condition) (sizeof(char[1 - 2*!(condition)]) - 1) 3153e48be05SJohannes Berg #define NLA_ENSURE_INT_TYPE(tp) \ 3163e48be05SJohannes Berg (__NLA_ENSURE(tp == NLA_S8 || tp == NLA_U8 || \ 3173e48be05SJohannes Berg tp == NLA_S16 || tp == NLA_U16 || \ 3183e48be05SJohannes Berg tp == NLA_S32 || tp == NLA_U32 || \ 3193e48be05SJohannes Berg tp == NLA_S64 || tp == NLA_U64) + tp) 32033188bd6SJohannes Berg #define NLA_ENSURE_NO_VALIDATION_PTR(tp) \ 32133188bd6SJohannes Berg (__NLA_ENSURE(tp != NLA_BITFIELD32 && \ 32233188bd6SJohannes Berg tp != NLA_REJECT && \ 32333188bd6SJohannes Berg tp != NLA_NESTED && \ 32433188bd6SJohannes Berg tp != NLA_NESTED_ARRAY) + tp) 3253e48be05SJohannes Berg 3263e48be05SJohannes Berg #define NLA_POLICY_RANGE(tp, _min, _max) { \ 3273e48be05SJohannes Berg .type = NLA_ENSURE_INT_TYPE(tp), \ 3283e48be05SJohannes Berg .validation_type = NLA_VALIDATE_RANGE, \ 3293e48be05SJohannes Berg .min = _min, \ 3303e48be05SJohannes Berg .max = _max \ 3313e48be05SJohannes Berg } 3323e48be05SJohannes Berg 3333e48be05SJohannes Berg #define NLA_POLICY_MIN(tp, _min) { \ 3343e48be05SJohannes Berg .type = NLA_ENSURE_INT_TYPE(tp), \ 3353e48be05SJohannes Berg .validation_type = NLA_VALIDATE_MIN, \ 3363e48be05SJohannes Berg .min = _min, \ 3373e48be05SJohannes Berg } 3383e48be05SJohannes Berg 3393e48be05SJohannes Berg #define NLA_POLICY_MAX(tp, _max) { \ 3403e48be05SJohannes Berg .type = NLA_ENSURE_INT_TYPE(tp), \ 3413e48be05SJohannes Berg .validation_type = NLA_VALIDATE_MAX, \ 3423e48be05SJohannes Berg .max = _max, \ 3433e48be05SJohannes Berg } 3443e48be05SJohannes Berg 34533188bd6SJohannes Berg #define NLA_POLICY_VALIDATE_FN(tp, fn, ...) { \ 34633188bd6SJohannes Berg .type = NLA_ENSURE_NO_VALIDATION_PTR(tp), \ 34733188bd6SJohannes Berg .validation_type = NLA_VALIDATE_FUNCTION, \ 34833188bd6SJohannes Berg .validate = fn, \ 34933188bd6SJohannes Berg .len = __VA_ARGS__ + 0, \ 35033188bd6SJohannes Berg } 35133188bd6SJohannes Berg 3524e902c57SThomas Graf /** 3534e902c57SThomas Graf * struct nl_info - netlink source information 3544e902c57SThomas Graf * @nlh: Netlink message header of original request 35515e47304SEric W. Biederman * @portid: Netlink PORTID of requesting application 3564e902c57SThomas Graf */ 3574e902c57SThomas Graf struct nl_info { 3584e902c57SThomas Graf struct nlmsghdr *nlh; 3594d1169c1SDenis V. Lunev struct net *nl_net; 36015e47304SEric W. Biederman u32 portid; 3613b1137feSDavid Ahern bool skip_notify; 3624e902c57SThomas Graf }; 3634e902c57SThomas Graf 3644f69053bSJoe Perches int netlink_rcv_skb(struct sk_buff *skb, 3652d4bc933SJohannes Berg int (*cb)(struct sk_buff *, struct nlmsghdr *, 3662d4bc933SJohannes Berg struct netlink_ext_ack *)); 3674f69053bSJoe Perches int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, 3684f69053bSJoe Perches unsigned int group, int report, gfp_t flags); 36982ace47aSThomas Graf 3704f69053bSJoe Perches int nla_validate(const struct nlattr *head, int len, int maxtype, 371fceb6435SJohannes Berg const struct nla_policy *policy, 372fceb6435SJohannes Berg struct netlink_ext_ack *extack); 3734f69053bSJoe Perches int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head, 374fceb6435SJohannes Berg int len, const struct nla_policy *policy, 375fceb6435SJohannes Berg struct netlink_ext_ack *extack); 3764f69053bSJoe Perches int nla_policy_len(const struct nla_policy *, int); 3774f69053bSJoe Perches struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype); 3784f69053bSJoe Perches size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize); 3792cf0c8b3SPhil Sutter char *nla_strdup(const struct nlattr *nla, gfp_t flags); 3804f69053bSJoe Perches int nla_memcpy(void *dest, const struct nlattr *src, int count); 3814f69053bSJoe Perches int nla_memcmp(const struct nlattr *nla, const void *data, size_t size); 3824f69053bSJoe Perches int nla_strcmp(const struct nlattr *nla, const char *str); 3834f69053bSJoe Perches struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); 384089bf1a6SNicolas Dichtel struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, 385089bf1a6SNicolas Dichtel int attrlen, int padattr); 3864f69053bSJoe Perches void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 3874f69053bSJoe Perches struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); 388089bf1a6SNicolas Dichtel struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, 389089bf1a6SNicolas Dichtel int attrlen, int padattr); 3904f69053bSJoe Perches void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 3914f69053bSJoe Perches void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, 392fe4944e5SThomas Graf const void *data); 393089bf1a6SNicolas Dichtel void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, 394089bf1a6SNicolas Dichtel const void *data, int padattr); 3954f69053bSJoe Perches void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); 3964f69053bSJoe Perches int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data); 397089bf1a6SNicolas Dichtel int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, 398089bf1a6SNicolas Dichtel const void *data, int padattr); 3994f69053bSJoe Perches int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); 4004f69053bSJoe Perches int nla_append(struct sk_buff *skb, int attrlen, const void *data); 401bfa83a9eSThomas Graf 402bfa83a9eSThomas Graf /************************************************************************** 403bfa83a9eSThomas Graf * Netlink Messages 404bfa83a9eSThomas Graf **************************************************************************/ 405bfa83a9eSThomas Graf 406bfa83a9eSThomas Graf /** 407bfa83a9eSThomas Graf * nlmsg_msg_size - length of netlink message not including padding 408bfa83a9eSThomas Graf * @payload: length of message payload 409bfa83a9eSThomas Graf */ 410bfa83a9eSThomas Graf static inline int nlmsg_msg_size(int payload) 411bfa83a9eSThomas Graf { 412bfa83a9eSThomas Graf return NLMSG_HDRLEN + payload; 413bfa83a9eSThomas Graf } 414bfa83a9eSThomas Graf 415bfa83a9eSThomas Graf /** 416bfa83a9eSThomas Graf * nlmsg_total_size - length of netlink message including padding 417bfa83a9eSThomas Graf * @payload: length of message payload 418bfa83a9eSThomas Graf */ 419bfa83a9eSThomas Graf static inline int nlmsg_total_size(int payload) 420bfa83a9eSThomas Graf { 421bfa83a9eSThomas Graf return NLMSG_ALIGN(nlmsg_msg_size(payload)); 422bfa83a9eSThomas Graf } 423bfa83a9eSThomas Graf 424bfa83a9eSThomas Graf /** 425bfa83a9eSThomas Graf * nlmsg_padlen - length of padding at the message's tail 426bfa83a9eSThomas Graf * @payload: length of message payload 427bfa83a9eSThomas Graf */ 428bfa83a9eSThomas Graf static inline int nlmsg_padlen(int payload) 429bfa83a9eSThomas Graf { 430bfa83a9eSThomas Graf return nlmsg_total_size(payload) - nlmsg_msg_size(payload); 431bfa83a9eSThomas Graf } 432bfa83a9eSThomas Graf 433bfa83a9eSThomas Graf /** 434bfa83a9eSThomas Graf * nlmsg_data - head of message payload 43570f23fd6SJustin P. Mattock * @nlh: netlink message header 436bfa83a9eSThomas Graf */ 437bfa83a9eSThomas Graf static inline void *nlmsg_data(const struct nlmsghdr *nlh) 438bfa83a9eSThomas Graf { 439bfa83a9eSThomas Graf return (unsigned char *) nlh + NLMSG_HDRLEN; 440bfa83a9eSThomas Graf } 441bfa83a9eSThomas Graf 442bfa83a9eSThomas Graf /** 443bfa83a9eSThomas Graf * nlmsg_len - length of message payload 444bfa83a9eSThomas Graf * @nlh: netlink message header 445bfa83a9eSThomas Graf */ 446bfa83a9eSThomas Graf static inline int nlmsg_len(const struct nlmsghdr *nlh) 447bfa83a9eSThomas Graf { 448bfa83a9eSThomas Graf return nlh->nlmsg_len - NLMSG_HDRLEN; 449bfa83a9eSThomas Graf } 450bfa83a9eSThomas Graf 451bfa83a9eSThomas Graf /** 452bfa83a9eSThomas Graf * nlmsg_attrdata - head of attributes data 453bfa83a9eSThomas Graf * @nlh: netlink message header 454bfa83a9eSThomas Graf * @hdrlen: length of family specific header 455bfa83a9eSThomas Graf */ 456bfa83a9eSThomas Graf static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, 457bfa83a9eSThomas Graf int hdrlen) 458bfa83a9eSThomas Graf { 459bfa83a9eSThomas Graf unsigned char *data = nlmsg_data(nlh); 460bfa83a9eSThomas Graf return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); 461bfa83a9eSThomas Graf } 462bfa83a9eSThomas Graf 463bfa83a9eSThomas Graf /** 464bfa83a9eSThomas Graf * nlmsg_attrlen - length of attributes data 465bfa83a9eSThomas Graf * @nlh: netlink message header 466bfa83a9eSThomas Graf * @hdrlen: length of family specific header 467bfa83a9eSThomas Graf */ 468bfa83a9eSThomas Graf static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) 469bfa83a9eSThomas Graf { 470bfa83a9eSThomas Graf return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); 471bfa83a9eSThomas Graf } 472bfa83a9eSThomas Graf 473bfa83a9eSThomas Graf /** 474bfa83a9eSThomas Graf * nlmsg_ok - check if the netlink message fits into the remaining bytes 475bfa83a9eSThomas Graf * @nlh: netlink message header 476bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 477bfa83a9eSThomas Graf */ 478bfa83a9eSThomas Graf static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) 479bfa83a9eSThomas Graf { 480619e803dSVegard Nossum return (remaining >= (int) sizeof(struct nlmsghdr) && 481bfa83a9eSThomas Graf nlh->nlmsg_len >= sizeof(struct nlmsghdr) && 482bfa83a9eSThomas Graf nlh->nlmsg_len <= remaining); 483bfa83a9eSThomas Graf } 484bfa83a9eSThomas Graf 485bfa83a9eSThomas Graf /** 486bfa83a9eSThomas Graf * nlmsg_next - next netlink message in message stream 487bfa83a9eSThomas Graf * @nlh: netlink message header 488bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 489bfa83a9eSThomas Graf * 490bfa83a9eSThomas Graf * Returns the next netlink message in the message stream and 491bfa83a9eSThomas Graf * decrements remaining by the size of the current message. 492bfa83a9eSThomas Graf */ 4933654654fSJan Engelhardt static inline struct nlmsghdr * 4943654654fSJan Engelhardt nlmsg_next(const struct nlmsghdr *nlh, int *remaining) 495bfa83a9eSThomas Graf { 496bfa83a9eSThomas Graf int totlen = NLMSG_ALIGN(nlh->nlmsg_len); 497bfa83a9eSThomas Graf 498bfa83a9eSThomas Graf *remaining -= totlen; 499bfa83a9eSThomas Graf 500bfa83a9eSThomas Graf return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); 501bfa83a9eSThomas Graf } 502bfa83a9eSThomas Graf 503bfa83a9eSThomas Graf /** 504bfa83a9eSThomas Graf * nlmsg_parse - parse attributes of a netlink message 505bfa83a9eSThomas Graf * @nlh: netlink message header 506bfa83a9eSThomas Graf * @hdrlen: length of family specific header 507bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 508bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 509bfa83a9eSThomas Graf * @policy: validation policy 510fceb6435SJohannes Berg * @extack: extended ACK report struct 511bfa83a9eSThomas Graf * 512bfa83a9eSThomas Graf * See nla_parse() 513bfa83a9eSThomas Graf */ 5143a6c2b41SPatrick McHardy static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, 515bfa83a9eSThomas Graf struct nlattr *tb[], int maxtype, 516fceb6435SJohannes Berg const struct nla_policy *policy, 517fceb6435SJohannes Berg struct netlink_ext_ack *extack) 518bfa83a9eSThomas Graf { 5193d0d4337SDavid Ahern if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) { 5203d0d4337SDavid Ahern NL_SET_ERR_MSG(extack, "Invalid header length"); 521bfa83a9eSThomas Graf return -EINVAL; 5223d0d4337SDavid Ahern } 523bfa83a9eSThomas Graf 524bfa83a9eSThomas Graf return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), 525fceb6435SJohannes Berg nlmsg_attrlen(nlh, hdrlen), policy, extack); 526bfa83a9eSThomas Graf } 527bfa83a9eSThomas Graf 528bfa83a9eSThomas Graf /** 529bfa83a9eSThomas Graf * nlmsg_find_attr - find a specific attribute in a netlink message 530bfa83a9eSThomas Graf * @nlh: netlink message header 531bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 532bfa83a9eSThomas Graf * @attrtype: type of attribute to look for 533bfa83a9eSThomas Graf * 534bfa83a9eSThomas Graf * Returns the first attribute which matches the specified type. 535bfa83a9eSThomas Graf */ 5366b8c92baSNelson Elhage static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, 537bfa83a9eSThomas Graf int hdrlen, int attrtype) 538bfa83a9eSThomas Graf { 539bfa83a9eSThomas Graf return nla_find(nlmsg_attrdata(nlh, hdrlen), 540bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), attrtype); 541bfa83a9eSThomas Graf } 542bfa83a9eSThomas Graf 543bfa83a9eSThomas Graf /** 544bfa83a9eSThomas Graf * nlmsg_validate - validate a netlink message including attributes 545bfa83a9eSThomas Graf * @nlh: netlinket message header 546bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 547bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 548bfa83a9eSThomas Graf * @policy: validation policy 549fceb6435SJohannes Berg * @extack: extended ACK report struct 550bfa83a9eSThomas Graf */ 5513654654fSJan Engelhardt static inline int nlmsg_validate(const struct nlmsghdr *nlh, 5523654654fSJan Engelhardt int hdrlen, int maxtype, 553fceb6435SJohannes Berg const struct nla_policy *policy, 554fceb6435SJohannes Berg struct netlink_ext_ack *extack) 555bfa83a9eSThomas Graf { 556bfa83a9eSThomas Graf if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) 557bfa83a9eSThomas Graf return -EINVAL; 558bfa83a9eSThomas Graf 559bfa83a9eSThomas Graf return nla_validate(nlmsg_attrdata(nlh, hdrlen), 560fceb6435SJohannes Berg nlmsg_attrlen(nlh, hdrlen), maxtype, policy, 561fceb6435SJohannes Berg extack); 562bfa83a9eSThomas Graf } 563bfa83a9eSThomas Graf 564bfa83a9eSThomas Graf /** 56597676b6bSThomas Graf * nlmsg_report - need to report back to application? 56697676b6bSThomas Graf * @nlh: netlink message header 56797676b6bSThomas Graf * 56897676b6bSThomas Graf * Returns 1 if a report back to the application is requested. 56997676b6bSThomas Graf */ 5703a6c2b41SPatrick McHardy static inline int nlmsg_report(const struct nlmsghdr *nlh) 57197676b6bSThomas Graf { 57297676b6bSThomas Graf return !!(nlh->nlmsg_flags & NLM_F_ECHO); 57397676b6bSThomas Graf } 57497676b6bSThomas Graf 57597676b6bSThomas Graf /** 576bfa83a9eSThomas Graf * nlmsg_for_each_attr - iterate over a stream of attributes 577bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 578bfa83a9eSThomas Graf * @nlh: netlink message header 579bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 580bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 581bfa83a9eSThomas Graf */ 582bfa83a9eSThomas Graf #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ 583bfa83a9eSThomas Graf nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ 584bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), rem) 585bfa83a9eSThomas Graf 586bfa83a9eSThomas Graf /** 587bfa83a9eSThomas Graf * nlmsg_put - Add a new netlink message to an skb 588bfa83a9eSThomas Graf * @skb: socket buffer to store message in 5892c6ba4b1SNicolas Dichtel * @portid: netlink PORTID of requesting application 590bfa83a9eSThomas Graf * @seq: sequence number of message 591bfa83a9eSThomas Graf * @type: message type 592bfa83a9eSThomas Graf * @payload: length of message payload 593bfa83a9eSThomas Graf * @flags: message flags 594bfa83a9eSThomas Graf * 595bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 596bfa83a9eSThomas Graf * the message header and payload. 597bfa83a9eSThomas Graf */ 59815e47304SEric W. Biederman static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, 599bfa83a9eSThomas Graf int type, int payload, int flags) 600bfa83a9eSThomas Graf { 601bfa83a9eSThomas Graf if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) 602bfa83a9eSThomas Graf return NULL; 603bfa83a9eSThomas Graf 60415e47304SEric W. Biederman return __nlmsg_put(skb, portid, seq, type, payload, flags); 605bfa83a9eSThomas Graf } 606bfa83a9eSThomas Graf 607bfa83a9eSThomas Graf /** 608bfa83a9eSThomas Graf * nlmsg_put_answer - Add a new callback based netlink message to an skb 609bfa83a9eSThomas Graf * @skb: socket buffer to store message in 610bfa83a9eSThomas Graf * @cb: netlink callback 611bfa83a9eSThomas Graf * @type: message type 612bfa83a9eSThomas Graf * @payload: length of message payload 613bfa83a9eSThomas Graf * @flags: message flags 614bfa83a9eSThomas Graf * 615bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 616bfa83a9eSThomas Graf * the message header and payload. 617bfa83a9eSThomas Graf */ 618bfa83a9eSThomas Graf static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, 619bfa83a9eSThomas Graf struct netlink_callback *cb, 620bfa83a9eSThomas Graf int type, int payload, 621bfa83a9eSThomas Graf int flags) 622bfa83a9eSThomas Graf { 62315e47304SEric W. Biederman return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 624bfa83a9eSThomas Graf type, payload, flags); 625bfa83a9eSThomas Graf } 626bfa83a9eSThomas Graf 627bfa83a9eSThomas Graf /** 628bfa83a9eSThomas Graf * nlmsg_new - Allocate a new netlink message 629339bf98fSThomas Graf * @payload: size of the message payload 630fe4944e5SThomas Graf * @flags: the type of memory to allocate. 631bfa83a9eSThomas Graf * 632339bf98fSThomas Graf * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known 633339bf98fSThomas Graf * and a good default is needed. 634bfa83a9eSThomas Graf */ 635339bf98fSThomas Graf static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) 636bfa83a9eSThomas Graf { 637339bf98fSThomas Graf return alloc_skb(nlmsg_total_size(payload), flags); 638bfa83a9eSThomas Graf } 639bfa83a9eSThomas Graf 640bfa83a9eSThomas Graf /** 641bfa83a9eSThomas Graf * nlmsg_end - Finalize a netlink message 642bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 643bfa83a9eSThomas Graf * @nlh: netlink message header 644bfa83a9eSThomas Graf * 645bfa83a9eSThomas Graf * Corrects the netlink message header to include the appeneded 646bfa83a9eSThomas Graf * attributes. Only necessary if attributes have been added to 647bfa83a9eSThomas Graf * the message. 648bfa83a9eSThomas Graf */ 649053c095aSJohannes Berg static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) 650bfa83a9eSThomas Graf { 65127a884dcSArnaldo Carvalho de Melo nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; 652bfa83a9eSThomas Graf } 653bfa83a9eSThomas Graf 654bfa83a9eSThomas Graf /** 655fe4944e5SThomas Graf * nlmsg_get_pos - return current position in netlink message 656fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 657fe4944e5SThomas Graf * 658fe4944e5SThomas Graf * Returns a pointer to the current tail of the message. 659fe4944e5SThomas Graf */ 660fe4944e5SThomas Graf static inline void *nlmsg_get_pos(struct sk_buff *skb) 661fe4944e5SThomas Graf { 66227a884dcSArnaldo Carvalho de Melo return skb_tail_pointer(skb); 663fe4944e5SThomas Graf } 664fe4944e5SThomas Graf 665fe4944e5SThomas Graf /** 666fe4944e5SThomas Graf * nlmsg_trim - Trim message to a mark 667fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 668fe4944e5SThomas Graf * @mark: mark to trim to 669fe4944e5SThomas Graf * 670bc3ed28cSThomas Graf * Trims the message to the provided mark. 671fe4944e5SThomas Graf */ 672bc3ed28cSThomas Graf static inline void nlmsg_trim(struct sk_buff *skb, const void *mark) 673fe4944e5SThomas Graf { 674149118d8SThomas Graf if (mark) { 675149118d8SThomas Graf WARN_ON((unsigned char *) mark < skb->data); 676fe4944e5SThomas Graf skb_trim(skb, (unsigned char *) mark - skb->data); 677fe4944e5SThomas Graf } 678149118d8SThomas Graf } 679fe4944e5SThomas Graf 680fe4944e5SThomas Graf /** 681bfa83a9eSThomas Graf * nlmsg_cancel - Cancel construction of a netlink message 682bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 683bfa83a9eSThomas Graf * @nlh: netlink message header 684bfa83a9eSThomas Graf * 685bfa83a9eSThomas Graf * Removes the complete netlink message including all 686bc3ed28cSThomas Graf * attributes from the socket buffer again. 687bfa83a9eSThomas Graf */ 688bc3ed28cSThomas Graf static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) 689bfa83a9eSThomas Graf { 690bc3ed28cSThomas Graf nlmsg_trim(skb, nlh); 691bfa83a9eSThomas Graf } 692bfa83a9eSThomas Graf 693bfa83a9eSThomas Graf /** 694bfa83a9eSThomas Graf * nlmsg_free - free a netlink message 695bfa83a9eSThomas Graf * @skb: socket buffer of netlink message 696bfa83a9eSThomas Graf */ 697bfa83a9eSThomas Graf static inline void nlmsg_free(struct sk_buff *skb) 698bfa83a9eSThomas Graf { 699bfa83a9eSThomas Graf kfree_skb(skb); 700bfa83a9eSThomas Graf } 701bfa83a9eSThomas Graf 702bfa83a9eSThomas Graf /** 703bfa83a9eSThomas Graf * nlmsg_multicast - multicast a netlink message 704bfa83a9eSThomas Graf * @sk: netlink socket to spread messages to 705bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 70615e47304SEric W. Biederman * @portid: own netlink portid to avoid sending to yourself 707bfa83a9eSThomas Graf * @group: multicast group id 708d387f6adSThomas Graf * @flags: allocation flags 709bfa83a9eSThomas Graf */ 710bfa83a9eSThomas Graf static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, 71115e47304SEric W. Biederman u32 portid, unsigned int group, gfp_t flags) 712bfa83a9eSThomas Graf { 713bfa83a9eSThomas Graf int err; 714bfa83a9eSThomas Graf 715bfa83a9eSThomas Graf NETLINK_CB(skb).dst_group = group; 716bfa83a9eSThomas Graf 71715e47304SEric W. Biederman err = netlink_broadcast(sk, skb, portid, group, flags); 718bfa83a9eSThomas Graf if (err > 0) 719bfa83a9eSThomas Graf err = 0; 720bfa83a9eSThomas Graf 721bfa83a9eSThomas Graf return err; 722bfa83a9eSThomas Graf } 723bfa83a9eSThomas Graf 724bfa83a9eSThomas Graf /** 725bfa83a9eSThomas Graf * nlmsg_unicast - unicast a netlink message 726bfa83a9eSThomas Graf * @sk: netlink socket to spread message to 727bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 72815e47304SEric W. Biederman * @portid: netlink portid of the destination socket 729bfa83a9eSThomas Graf */ 73015e47304SEric W. Biederman static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid) 731bfa83a9eSThomas Graf { 732bfa83a9eSThomas Graf int err; 733bfa83a9eSThomas Graf 73415e47304SEric W. Biederman err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT); 735bfa83a9eSThomas Graf if (err > 0) 736bfa83a9eSThomas Graf err = 0; 737bfa83a9eSThomas Graf 738bfa83a9eSThomas Graf return err; 739bfa83a9eSThomas Graf } 740bfa83a9eSThomas Graf 741bfa83a9eSThomas Graf /** 742bfa83a9eSThomas Graf * nlmsg_for_each_msg - iterate over a stream of messages 743bfa83a9eSThomas Graf * @pos: loop counter, set to current message 744bfa83a9eSThomas Graf * @head: head of message stream 745bfa83a9eSThomas Graf * @len: length of message stream 746bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 747bfa83a9eSThomas Graf */ 748bfa83a9eSThomas Graf #define nlmsg_for_each_msg(pos, head, len, rem) \ 749bfa83a9eSThomas Graf for (pos = head, rem = len; \ 750bfa83a9eSThomas Graf nlmsg_ok(pos, rem); \ 751bfa83a9eSThomas Graf pos = nlmsg_next(pos, &(rem))) 752bfa83a9eSThomas Graf 753670dc283SJohannes Berg /** 754670dc283SJohannes Berg * nl_dump_check_consistent - check if sequence is consistent and advertise if not 755670dc283SJohannes Berg * @cb: netlink callback structure that stores the sequence number 756670dc283SJohannes Berg * @nlh: netlink message header to write the flag to 757670dc283SJohannes Berg * 758670dc283SJohannes Berg * This function checks if the sequence (generation) number changed during dump 759670dc283SJohannes Berg * and if it did, advertises it in the netlink message header. 760670dc283SJohannes Berg * 761670dc283SJohannes Berg * The correct way to use it is to set cb->seq to the generation counter when 762670dc283SJohannes Berg * all locks for dumping have been acquired, and then call this function for 763670dc283SJohannes Berg * each message that is generated. 764670dc283SJohannes Berg * 765670dc283SJohannes Berg * Note that due to initialisation concerns, 0 is an invalid sequence number 766670dc283SJohannes Berg * and must not be used by code that uses this functionality. 767670dc283SJohannes Berg */ 768670dc283SJohannes Berg static inline void 769670dc283SJohannes Berg nl_dump_check_consistent(struct netlink_callback *cb, 770670dc283SJohannes Berg struct nlmsghdr *nlh) 771670dc283SJohannes Berg { 772670dc283SJohannes Berg if (cb->prev_seq && cb->seq != cb->prev_seq) 773670dc283SJohannes Berg nlh->nlmsg_flags |= NLM_F_DUMP_INTR; 774670dc283SJohannes Berg cb->prev_seq = cb->seq; 775670dc283SJohannes Berg } 776670dc283SJohannes Berg 777bfa83a9eSThomas Graf /************************************************************************** 778bfa83a9eSThomas Graf * Netlink Attributes 779bfa83a9eSThomas Graf **************************************************************************/ 780bfa83a9eSThomas Graf 781bfa83a9eSThomas Graf /** 782bfa83a9eSThomas Graf * nla_attr_size - length of attribute not including padding 783bfa83a9eSThomas Graf * @payload: length of payload 784bfa83a9eSThomas Graf */ 785bfa83a9eSThomas Graf static inline int nla_attr_size(int payload) 786bfa83a9eSThomas Graf { 787bfa83a9eSThomas Graf return NLA_HDRLEN + payload; 788bfa83a9eSThomas Graf } 789bfa83a9eSThomas Graf 790bfa83a9eSThomas Graf /** 791bfa83a9eSThomas Graf * nla_total_size - total length of attribute including padding 792bfa83a9eSThomas Graf * @payload: length of payload 793bfa83a9eSThomas Graf */ 794bfa83a9eSThomas Graf static inline int nla_total_size(int payload) 795bfa83a9eSThomas Graf { 796bfa83a9eSThomas Graf return NLA_ALIGN(nla_attr_size(payload)); 797bfa83a9eSThomas Graf } 798bfa83a9eSThomas Graf 799bfa83a9eSThomas Graf /** 800bfa83a9eSThomas Graf * nla_padlen - length of padding at the tail of attribute 801bfa83a9eSThomas Graf * @payload: length of payload 802bfa83a9eSThomas Graf */ 803bfa83a9eSThomas Graf static inline int nla_padlen(int payload) 804bfa83a9eSThomas Graf { 805bfa83a9eSThomas Graf return nla_total_size(payload) - nla_attr_size(payload); 806bfa83a9eSThomas Graf } 807bfa83a9eSThomas Graf 808bfa83a9eSThomas Graf /** 8098f4c1f9bSThomas Graf * nla_type - attribute type 8108f4c1f9bSThomas Graf * @nla: netlink attribute 8118f4c1f9bSThomas Graf */ 8128f4c1f9bSThomas Graf static inline int nla_type(const struct nlattr *nla) 8138f4c1f9bSThomas Graf { 8148f4c1f9bSThomas Graf return nla->nla_type & NLA_TYPE_MASK; 8158f4c1f9bSThomas Graf } 8168f4c1f9bSThomas Graf 8178f4c1f9bSThomas Graf /** 818bfa83a9eSThomas Graf * nla_data - head of payload 819bfa83a9eSThomas Graf * @nla: netlink attribute 820bfa83a9eSThomas Graf */ 821bfa83a9eSThomas Graf static inline void *nla_data(const struct nlattr *nla) 822bfa83a9eSThomas Graf { 823bfa83a9eSThomas Graf return (char *) nla + NLA_HDRLEN; 824bfa83a9eSThomas Graf } 825bfa83a9eSThomas Graf 826bfa83a9eSThomas Graf /** 827bfa83a9eSThomas Graf * nla_len - length of payload 828bfa83a9eSThomas Graf * @nla: netlink attribute 829bfa83a9eSThomas Graf */ 830bfa83a9eSThomas Graf static inline int nla_len(const struct nlattr *nla) 831bfa83a9eSThomas Graf { 832bfa83a9eSThomas Graf return nla->nla_len - NLA_HDRLEN; 833bfa83a9eSThomas Graf } 834bfa83a9eSThomas Graf 835bfa83a9eSThomas Graf /** 836bfa83a9eSThomas Graf * nla_ok - check if the netlink attribute fits into the remaining bytes 837bfa83a9eSThomas Graf * @nla: netlink attribute 838bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 839bfa83a9eSThomas Graf */ 840bfa83a9eSThomas Graf static inline int nla_ok(const struct nlattr *nla, int remaining) 841bfa83a9eSThomas Graf { 8423e1ed981SAlexey Dobriyan return remaining >= (int) sizeof(*nla) && 8433e1ed981SAlexey Dobriyan nla->nla_len >= sizeof(*nla) && 844bfa83a9eSThomas Graf nla->nla_len <= remaining; 845bfa83a9eSThomas Graf } 846bfa83a9eSThomas Graf 847bfa83a9eSThomas Graf /** 848d1ec3b77SPierre Ynard * nla_next - next netlink attribute in attribute stream 849bfa83a9eSThomas Graf * @nla: netlink attribute 850bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 851bfa83a9eSThomas Graf * 852bfa83a9eSThomas Graf * Returns the next netlink attribute in the attribute stream and 853bfa83a9eSThomas Graf * decrements remaining by the size of the current attribute. 854bfa83a9eSThomas Graf */ 855bfa83a9eSThomas Graf static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) 856bfa83a9eSThomas Graf { 8573b2c75d3SAlexey Dobriyan unsigned int totlen = NLA_ALIGN(nla->nla_len); 858bfa83a9eSThomas Graf 859bfa83a9eSThomas Graf *remaining -= totlen; 860bfa83a9eSThomas Graf return (struct nlattr *) ((char *) nla + totlen); 861bfa83a9eSThomas Graf } 862bfa83a9eSThomas Graf 863bfa83a9eSThomas Graf /** 864fe4944e5SThomas Graf * nla_find_nested - find attribute in a set of nested attributes 865fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 866fe4944e5SThomas Graf * @attrtype: type of attribute to look for 867fe4944e5SThomas Graf * 868fe4944e5SThomas Graf * Returns the first attribute which matches the specified type. 869fe4944e5SThomas Graf */ 8703654654fSJan Engelhardt static inline struct nlattr * 8713654654fSJan Engelhardt nla_find_nested(const struct nlattr *nla, int attrtype) 872fe4944e5SThomas Graf { 873fe4944e5SThomas Graf return nla_find(nla_data(nla), nla_len(nla), attrtype); 874fe4944e5SThomas Graf } 875fe4944e5SThomas Graf 876fe4944e5SThomas Graf /** 877bfa83a9eSThomas Graf * nla_parse_nested - parse nested attributes 878bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 879bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 880bfa83a9eSThomas Graf * @nla: attribute containing the nested attributes 881bfa83a9eSThomas Graf * @policy: validation policy 882fceb6435SJohannes Berg * @extack: extended ACK report struct 883bfa83a9eSThomas Graf * 884bfa83a9eSThomas Graf * See nla_parse() 885bfa83a9eSThomas Graf */ 886bfa83a9eSThomas Graf static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, 887b057efd4SPatrick McHardy const struct nlattr *nla, 888fceb6435SJohannes Berg const struct nla_policy *policy, 889fceb6435SJohannes Berg struct netlink_ext_ack *extack) 890bfa83a9eSThomas Graf { 891fceb6435SJohannes Berg return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy, 892fceb6435SJohannes Berg extack); 893bfa83a9eSThomas Graf } 8941092cb21SPatrick McHardy 8951092cb21SPatrick McHardy /** 896d1ec3b77SPierre Ynard * nla_put_u8 - Add a u8 netlink attribute to a socket buffer 897bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 898bfa83a9eSThomas Graf * @attrtype: attribute type 899bfa83a9eSThomas Graf * @value: numeric value 900bfa83a9eSThomas Graf */ 901bfa83a9eSThomas Graf static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) 902bfa83a9eSThomas Graf { 903b4391db4SArnd Bergmann /* temporary variables to work around GCC PR81715 with asan-stack=1 */ 904b4391db4SArnd Bergmann u8 tmp = value; 905b4391db4SArnd Bergmann 906b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(u8), &tmp); 907bfa83a9eSThomas Graf } 908bfa83a9eSThomas Graf 909bfa83a9eSThomas Graf /** 910bfa83a9eSThomas Graf * nla_put_u16 - Add a u16 netlink attribute to a socket buffer 911bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 912bfa83a9eSThomas Graf * @attrtype: attribute type 913bfa83a9eSThomas Graf * @value: numeric value 914bfa83a9eSThomas Graf */ 915bfa83a9eSThomas Graf static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) 916bfa83a9eSThomas Graf { 917b4391db4SArnd Bergmann u16 tmp = value; 918b4391db4SArnd Bergmann 919b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(u16), &tmp); 920bfa83a9eSThomas Graf } 921bfa83a9eSThomas Graf 922bfa83a9eSThomas Graf /** 923569a8fc3SDavid S. Miller * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer 924569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 925569a8fc3SDavid S. Miller * @attrtype: attribute type 926569a8fc3SDavid S. Miller * @value: numeric value 927569a8fc3SDavid S. Miller */ 928569a8fc3SDavid S. Miller static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value) 929569a8fc3SDavid S. Miller { 930b4391db4SArnd Bergmann __be16 tmp = value; 931b4391db4SArnd Bergmann 932b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__be16), &tmp); 933569a8fc3SDavid S. Miller } 934569a8fc3SDavid S. Miller 935569a8fc3SDavid S. Miller /** 9366c1dd3b6SDavid S. Miller * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer 9376c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 9386c1dd3b6SDavid S. Miller * @attrtype: attribute type 9396c1dd3b6SDavid S. Miller * @value: numeric value 9406c1dd3b6SDavid S. Miller */ 9416c1dd3b6SDavid S. Miller static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value) 9426c1dd3b6SDavid S. Miller { 943b4391db4SArnd Bergmann __be16 tmp = value; 944b4391db4SArnd Bergmann 945b4391db4SArnd Bergmann return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, tmp); 9466c1dd3b6SDavid S. Miller } 9476c1dd3b6SDavid S. Miller 9486c1dd3b6SDavid S. Miller /** 94924c410dcSDavid S. Miller * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer 95024c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 95124c410dcSDavid S. Miller * @attrtype: attribute type 95224c410dcSDavid S. Miller * @value: numeric value 95324c410dcSDavid S. Miller */ 95424c410dcSDavid S. Miller static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value) 95524c410dcSDavid S. Miller { 956b4391db4SArnd Bergmann __le16 tmp = value; 957b4391db4SArnd Bergmann 958b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__le16), &tmp); 95924c410dcSDavid S. Miller } 96024c410dcSDavid S. Miller 96124c410dcSDavid S. Miller /** 962bfa83a9eSThomas Graf * nla_put_u32 - Add a u32 netlink attribute to a socket buffer 963bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 964bfa83a9eSThomas Graf * @attrtype: attribute type 965bfa83a9eSThomas Graf * @value: numeric value 966bfa83a9eSThomas Graf */ 967bfa83a9eSThomas Graf static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) 968bfa83a9eSThomas Graf { 969b4391db4SArnd Bergmann u32 tmp = value; 970b4391db4SArnd Bergmann 971b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(u32), &tmp); 972bfa83a9eSThomas Graf } 973bfa83a9eSThomas Graf 974bfa83a9eSThomas Graf /** 975569a8fc3SDavid S. Miller * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer 976569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 977569a8fc3SDavid S. Miller * @attrtype: attribute type 978569a8fc3SDavid S. Miller * @value: numeric value 979569a8fc3SDavid S. Miller */ 980569a8fc3SDavid S. Miller static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value) 981569a8fc3SDavid S. Miller { 982b4391db4SArnd Bergmann __be32 tmp = value; 983b4391db4SArnd Bergmann 984b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__be32), &tmp); 985569a8fc3SDavid S. Miller } 986569a8fc3SDavid S. Miller 987569a8fc3SDavid S. Miller /** 9886c1dd3b6SDavid S. Miller * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer 9896c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 9906c1dd3b6SDavid S. Miller * @attrtype: attribute type 9916c1dd3b6SDavid S. Miller * @value: numeric value 9926c1dd3b6SDavid S. Miller */ 9936c1dd3b6SDavid S. Miller static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value) 9946c1dd3b6SDavid S. Miller { 995b4391db4SArnd Bergmann __be32 tmp = value; 996b4391db4SArnd Bergmann 997b4391db4SArnd Bergmann return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, tmp); 9986c1dd3b6SDavid S. Miller } 9996c1dd3b6SDavid S. Miller 10006c1dd3b6SDavid S. Miller /** 100124c410dcSDavid S. Miller * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer 100224c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 100324c410dcSDavid S. Miller * @attrtype: attribute type 100424c410dcSDavid S. Miller * @value: numeric value 100524c410dcSDavid S. Miller */ 100624c410dcSDavid S. Miller static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value) 100724c410dcSDavid S. Miller { 1008b4391db4SArnd Bergmann __le32 tmp = value; 1009b4391db4SArnd Bergmann 1010b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__le32), &tmp); 101124c410dcSDavid S. Miller } 101224c410dcSDavid S. Miller 101324c410dcSDavid S. Miller /** 101473520786SNicolas Dichtel * nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it 101573520786SNicolas Dichtel * @skb: socket buffer to add attribute to 101673520786SNicolas Dichtel * @attrtype: attribute type 101773520786SNicolas Dichtel * @value: numeric value 101873520786SNicolas Dichtel * @padattr: attribute type for the padding 101973520786SNicolas Dichtel */ 102073520786SNicolas Dichtel static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype, 102173520786SNicolas Dichtel u64 value, int padattr) 102273520786SNicolas Dichtel { 1023b4391db4SArnd Bergmann u64 tmp = value; 1024b4391db4SArnd Bergmann 1025b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); 102673520786SNicolas Dichtel } 102773520786SNicolas Dichtel 102873520786SNicolas Dichtel /** 1029b46f6dedSNicolas Dichtel * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it 1030569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 1031569a8fc3SDavid S. Miller * @attrtype: attribute type 1032569a8fc3SDavid S. Miller * @value: numeric value 1033b46f6dedSNicolas Dichtel * @padattr: attribute type for the padding 1034569a8fc3SDavid S. Miller */ 1035b46f6dedSNicolas Dichtel static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value, 1036b46f6dedSNicolas Dichtel int padattr) 1037b46f6dedSNicolas Dichtel { 1038b4391db4SArnd Bergmann __be64 tmp = value; 1039b4391db4SArnd Bergmann 1040b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(__be64), &tmp, padattr); 1041b46f6dedSNicolas Dichtel } 1042b46f6dedSNicolas Dichtel 1043569a8fc3SDavid S. Miller /** 1044e9bbe898SNicolas Dichtel * nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it 10456c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 10466c1dd3b6SDavid S. Miller * @attrtype: attribute type 10476c1dd3b6SDavid S. Miller * @value: numeric value 1048e9bbe898SNicolas Dichtel * @padattr: attribute type for the padding 10496c1dd3b6SDavid S. Miller */ 1050e9bbe898SNicolas Dichtel static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value, 1051e9bbe898SNicolas Dichtel int padattr) 10526c1dd3b6SDavid S. Miller { 1053b4391db4SArnd Bergmann __be64 tmp = value; 1054b4391db4SArnd Bergmann 1055b4391db4SArnd Bergmann return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, tmp, 1056e9bbe898SNicolas Dichtel padattr); 10576c1dd3b6SDavid S. Miller } 10586c1dd3b6SDavid S. Miller 10596c1dd3b6SDavid S. Miller /** 1060e7479122SNicolas Dichtel * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it 106124c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 106224c410dcSDavid S. Miller * @attrtype: attribute type 106324c410dcSDavid S. Miller * @value: numeric value 1064e7479122SNicolas Dichtel * @padattr: attribute type for the padding 106524c410dcSDavid S. Miller */ 1066e7479122SNicolas Dichtel static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value, 1067e7479122SNicolas Dichtel int padattr) 106824c410dcSDavid S. Miller { 1069b4391db4SArnd Bergmann __le64 tmp = value; 1070b4391db4SArnd Bergmann 1071b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(__le64), &tmp, padattr); 107224c410dcSDavid S. Miller } 107324c410dcSDavid S. Miller 107424c410dcSDavid S. Miller /** 10754778e0beSJiri Pirko * nla_put_s8 - Add a s8 netlink attribute to a socket buffer 10764778e0beSJiri Pirko * @skb: socket buffer to add attribute to 10774778e0beSJiri Pirko * @attrtype: attribute type 10784778e0beSJiri Pirko * @value: numeric value 10794778e0beSJiri Pirko */ 10804778e0beSJiri Pirko static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value) 10814778e0beSJiri Pirko { 1082b4391db4SArnd Bergmann s8 tmp = value; 1083b4391db4SArnd Bergmann 1084b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(s8), &tmp); 10854778e0beSJiri Pirko } 10864778e0beSJiri Pirko 10874778e0beSJiri Pirko /** 10884778e0beSJiri Pirko * nla_put_s16 - Add a s16 netlink attribute to a socket buffer 10894778e0beSJiri Pirko * @skb: socket buffer to add attribute to 10904778e0beSJiri Pirko * @attrtype: attribute type 10914778e0beSJiri Pirko * @value: numeric value 10924778e0beSJiri Pirko */ 10934778e0beSJiri Pirko static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value) 10944778e0beSJiri Pirko { 1095b4391db4SArnd Bergmann s16 tmp = value; 1096b4391db4SArnd Bergmann 1097b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(s16), &tmp); 10984778e0beSJiri Pirko } 10994778e0beSJiri Pirko 11004778e0beSJiri Pirko /** 11014778e0beSJiri Pirko * nla_put_s32 - Add a s32 netlink attribute to a socket buffer 11024778e0beSJiri Pirko * @skb: socket buffer to add attribute to 11034778e0beSJiri Pirko * @attrtype: attribute type 11044778e0beSJiri Pirko * @value: numeric value 11054778e0beSJiri Pirko */ 11064778e0beSJiri Pirko static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value) 11074778e0beSJiri Pirko { 1108b4391db4SArnd Bergmann s32 tmp = value; 1109b4391db4SArnd Bergmann 1110b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(s32), &tmp); 11114778e0beSJiri Pirko } 11124778e0beSJiri Pirko 11134778e0beSJiri Pirko /** 1114756a2f59SNicolas Dichtel * nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it 11154778e0beSJiri Pirko * @skb: socket buffer to add attribute to 11164778e0beSJiri Pirko * @attrtype: attribute type 11174778e0beSJiri Pirko * @value: numeric value 1118756a2f59SNicolas Dichtel * @padattr: attribute type for the padding 11194778e0beSJiri Pirko */ 1120756a2f59SNicolas Dichtel static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value, 1121756a2f59SNicolas Dichtel int padattr) 11224778e0beSJiri Pirko { 1123b4391db4SArnd Bergmann s64 tmp = value; 1124b4391db4SArnd Bergmann 1125b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(s64), &tmp, padattr); 11264778e0beSJiri Pirko } 11274778e0beSJiri Pirko 11284778e0beSJiri Pirko /** 1129bfa83a9eSThomas Graf * nla_put_string - Add a string netlink attribute to a socket buffer 1130bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1131bfa83a9eSThomas Graf * @attrtype: attribute type 1132bfa83a9eSThomas Graf * @str: NUL terminated string 1133bfa83a9eSThomas Graf */ 1134bfa83a9eSThomas Graf static inline int nla_put_string(struct sk_buff *skb, int attrtype, 1135bfa83a9eSThomas Graf const char *str) 1136bfa83a9eSThomas Graf { 1137bfa83a9eSThomas Graf return nla_put(skb, attrtype, strlen(str) + 1, str); 1138bfa83a9eSThomas Graf } 1139bfa83a9eSThomas Graf 1140bfa83a9eSThomas Graf /** 1141bfa83a9eSThomas Graf * nla_put_flag - Add a flag netlink attribute to a socket buffer 1142bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1143bfa83a9eSThomas Graf * @attrtype: attribute type 1144bfa83a9eSThomas Graf */ 1145bfa83a9eSThomas Graf static inline int nla_put_flag(struct sk_buff *skb, int attrtype) 1146bfa83a9eSThomas Graf { 1147bfa83a9eSThomas Graf return nla_put(skb, attrtype, 0, NULL); 1148bfa83a9eSThomas Graf } 1149bfa83a9eSThomas Graf 1150bfa83a9eSThomas Graf /** 11512175d87cSNicolas Dichtel * nla_put_msecs - Add a msecs netlink attribute to a skb and align it 1152bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1153bfa83a9eSThomas Graf * @attrtype: attribute type 1154d87de1f3SMark Rustad * @njiffies: number of jiffies to convert to msecs 11552175d87cSNicolas Dichtel * @padattr: attribute type for the padding 1156bfa83a9eSThomas Graf */ 1157bfa83a9eSThomas Graf static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, 11582175d87cSNicolas Dichtel unsigned long njiffies, int padattr) 1159bfa83a9eSThomas Graf { 1160d87de1f3SMark Rustad u64 tmp = jiffies_to_msecs(njiffies); 11612175d87cSNicolas Dichtel 11622175d87cSNicolas Dichtel return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); 1163bfa83a9eSThomas Graf } 1164bfa83a9eSThomas Graf 1165bfa83a9eSThomas Graf /** 1166930345eaSJiri Benc * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket 1167930345eaSJiri Benc * buffer 1168930345eaSJiri Benc * @skb: socket buffer to add attribute to 1169930345eaSJiri Benc * @attrtype: attribute type 1170930345eaSJiri Benc * @addr: IPv4 address 1171930345eaSJiri Benc */ 1172930345eaSJiri Benc static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype, 1173930345eaSJiri Benc __be32 addr) 1174930345eaSJiri Benc { 1175b4391db4SArnd Bergmann __be32 tmp = addr; 1176b4391db4SArnd Bergmann 1177b4391db4SArnd Bergmann return nla_put_be32(skb, attrtype, tmp); 1178930345eaSJiri Benc } 1179930345eaSJiri Benc 1180930345eaSJiri Benc /** 1181930345eaSJiri Benc * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket 1182930345eaSJiri Benc * buffer 1183930345eaSJiri Benc * @skb: socket buffer to add attribute to 1184930345eaSJiri Benc * @attrtype: attribute type 1185930345eaSJiri Benc * @addr: IPv6 address 1186930345eaSJiri Benc */ 1187930345eaSJiri Benc static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype, 1188930345eaSJiri Benc const struct in6_addr *addr) 1189930345eaSJiri Benc { 1190930345eaSJiri Benc return nla_put(skb, attrtype, sizeof(*addr), addr); 1191930345eaSJiri Benc } 1192930345eaSJiri Benc 1193930345eaSJiri Benc /** 1194bfa83a9eSThomas Graf * nla_get_u32 - return payload of u32 attribute 1195bfa83a9eSThomas Graf * @nla: u32 netlink attribute 1196bfa83a9eSThomas Graf */ 1197b057efd4SPatrick McHardy static inline u32 nla_get_u32(const struct nlattr *nla) 1198bfa83a9eSThomas Graf { 1199bfa83a9eSThomas Graf return *(u32 *) nla_data(nla); 1200bfa83a9eSThomas Graf } 1201bfa83a9eSThomas Graf 1202bfa83a9eSThomas Graf /** 120300012e5bSAl Viro * nla_get_be32 - return payload of __be32 attribute 120400012e5bSAl Viro * @nla: __be32 netlink attribute 120500012e5bSAl Viro */ 1206b057efd4SPatrick McHardy static inline __be32 nla_get_be32(const struct nlattr *nla) 120700012e5bSAl Viro { 120800012e5bSAl Viro return *(__be32 *) nla_data(nla); 120900012e5bSAl Viro } 121000012e5bSAl Viro 121100012e5bSAl Viro /** 1212c648a013SAlexander Aring * nla_get_le32 - return payload of __le32 attribute 1213c648a013SAlexander Aring * @nla: __le32 netlink attribute 1214c648a013SAlexander Aring */ 1215c648a013SAlexander Aring static inline __le32 nla_get_le32(const struct nlattr *nla) 1216c648a013SAlexander Aring { 1217c648a013SAlexander Aring return *(__le32 *) nla_data(nla); 1218c648a013SAlexander Aring } 1219c648a013SAlexander Aring 1220c648a013SAlexander Aring /** 1221bfa83a9eSThomas Graf * nla_get_u16 - return payload of u16 attribute 1222bfa83a9eSThomas Graf * @nla: u16 netlink attribute 1223bfa83a9eSThomas Graf */ 1224b057efd4SPatrick McHardy static inline u16 nla_get_u16(const struct nlattr *nla) 1225bfa83a9eSThomas Graf { 1226bfa83a9eSThomas Graf return *(u16 *) nla_data(nla); 1227bfa83a9eSThomas Graf } 1228bfa83a9eSThomas Graf 1229bfa83a9eSThomas Graf /** 1230838965baSPatrick McHardy * nla_get_be16 - return payload of __be16 attribute 1231838965baSPatrick McHardy * @nla: __be16 netlink attribute 1232838965baSPatrick McHardy */ 1233b057efd4SPatrick McHardy static inline __be16 nla_get_be16(const struct nlattr *nla) 1234838965baSPatrick McHardy { 1235838965baSPatrick McHardy return *(__be16 *) nla_data(nla); 1236838965baSPatrick McHardy } 1237838965baSPatrick McHardy 1238838965baSPatrick McHardy /** 12394a89c256SThomas Graf * nla_get_le16 - return payload of __le16 attribute 12404a89c256SThomas Graf * @nla: __le16 netlink attribute 12414a89c256SThomas Graf */ 1242b057efd4SPatrick McHardy static inline __le16 nla_get_le16(const struct nlattr *nla) 12434a89c256SThomas Graf { 12444a89c256SThomas Graf return *(__le16 *) nla_data(nla); 12454a89c256SThomas Graf } 12464a89c256SThomas Graf 12474a89c256SThomas Graf /** 1248bfa83a9eSThomas Graf * nla_get_u8 - return payload of u8 attribute 1249bfa83a9eSThomas Graf * @nla: u8 netlink attribute 1250bfa83a9eSThomas Graf */ 1251b057efd4SPatrick McHardy static inline u8 nla_get_u8(const struct nlattr *nla) 1252bfa83a9eSThomas Graf { 1253bfa83a9eSThomas Graf return *(u8 *) nla_data(nla); 1254bfa83a9eSThomas Graf } 1255bfa83a9eSThomas Graf 1256bfa83a9eSThomas Graf /** 1257bfa83a9eSThomas Graf * nla_get_u64 - return payload of u64 attribute 1258bfa83a9eSThomas Graf * @nla: u64 netlink attribute 1259bfa83a9eSThomas Graf */ 1260b057efd4SPatrick McHardy static inline u64 nla_get_u64(const struct nlattr *nla) 1261bfa83a9eSThomas Graf { 1262bfa83a9eSThomas Graf u64 tmp; 1263bfa83a9eSThomas Graf 1264bfa83a9eSThomas Graf nla_memcpy(&tmp, nla, sizeof(tmp)); 1265bfa83a9eSThomas Graf 1266bfa83a9eSThomas Graf return tmp; 1267bfa83a9eSThomas Graf } 1268bfa83a9eSThomas Graf 1269bfa83a9eSThomas Graf /** 1270a17c8598SPablo Neira Ayuso * nla_get_be64 - return payload of __be64 attribute 1271a17c8598SPablo Neira Ayuso * @nla: __be64 netlink attribute 1272a17c8598SPablo Neira Ayuso */ 1273a17c8598SPablo Neira Ayuso static inline __be64 nla_get_be64(const struct nlattr *nla) 1274a17c8598SPablo Neira Ayuso { 1275f5d410f2SPablo Neira Ayuso __be64 tmp; 1276f5d410f2SPablo Neira Ayuso 1277f5d410f2SPablo Neira Ayuso nla_memcpy(&tmp, nla, sizeof(tmp)); 1278f5d410f2SPablo Neira Ayuso 1279f5d410f2SPablo Neira Ayuso return tmp; 1280a17c8598SPablo Neira Ayuso } 1281a17c8598SPablo Neira Ayuso 1282a17c8598SPablo Neira Ayuso /** 1283c648a013SAlexander Aring * nla_get_le64 - return payload of __le64 attribute 1284c648a013SAlexander Aring * @nla: __le64 netlink attribute 1285c648a013SAlexander Aring */ 1286c648a013SAlexander Aring static inline __le64 nla_get_le64(const struct nlattr *nla) 1287c648a013SAlexander Aring { 1288c648a013SAlexander Aring return *(__le64 *) nla_data(nla); 1289c648a013SAlexander Aring } 1290c648a013SAlexander Aring 1291c648a013SAlexander Aring /** 12924778e0beSJiri Pirko * nla_get_s32 - return payload of s32 attribute 12934778e0beSJiri Pirko * @nla: s32 netlink attribute 12944778e0beSJiri Pirko */ 12954778e0beSJiri Pirko static inline s32 nla_get_s32(const struct nlattr *nla) 12964778e0beSJiri Pirko { 12974778e0beSJiri Pirko return *(s32 *) nla_data(nla); 12984778e0beSJiri Pirko } 12994778e0beSJiri Pirko 13004778e0beSJiri Pirko /** 13014778e0beSJiri Pirko * nla_get_s16 - return payload of s16 attribute 13024778e0beSJiri Pirko * @nla: s16 netlink attribute 13034778e0beSJiri Pirko */ 13044778e0beSJiri Pirko static inline s16 nla_get_s16(const struct nlattr *nla) 13054778e0beSJiri Pirko { 13064778e0beSJiri Pirko return *(s16 *) nla_data(nla); 13074778e0beSJiri Pirko } 13084778e0beSJiri Pirko 13094778e0beSJiri Pirko /** 13104778e0beSJiri Pirko * nla_get_s8 - return payload of s8 attribute 13114778e0beSJiri Pirko * @nla: s8 netlink attribute 13124778e0beSJiri Pirko */ 13134778e0beSJiri Pirko static inline s8 nla_get_s8(const struct nlattr *nla) 13144778e0beSJiri Pirko { 13154778e0beSJiri Pirko return *(s8 *) nla_data(nla); 13164778e0beSJiri Pirko } 13174778e0beSJiri Pirko 13184778e0beSJiri Pirko /** 13194778e0beSJiri Pirko * nla_get_s64 - return payload of s64 attribute 13204778e0beSJiri Pirko * @nla: s64 netlink attribute 13214778e0beSJiri Pirko */ 13224778e0beSJiri Pirko static inline s64 nla_get_s64(const struct nlattr *nla) 13234778e0beSJiri Pirko { 13244778e0beSJiri Pirko s64 tmp; 13254778e0beSJiri Pirko 13264778e0beSJiri Pirko nla_memcpy(&tmp, nla, sizeof(tmp)); 13274778e0beSJiri Pirko 13284778e0beSJiri Pirko return tmp; 13294778e0beSJiri Pirko } 13304778e0beSJiri Pirko 13314778e0beSJiri Pirko /** 1332bfa83a9eSThomas Graf * nla_get_flag - return payload of flag attribute 1333bfa83a9eSThomas Graf * @nla: flag netlink attribute 1334bfa83a9eSThomas Graf */ 1335b057efd4SPatrick McHardy static inline int nla_get_flag(const struct nlattr *nla) 1336bfa83a9eSThomas Graf { 1337bfa83a9eSThomas Graf return !!nla; 1338bfa83a9eSThomas Graf } 1339bfa83a9eSThomas Graf 1340bfa83a9eSThomas Graf /** 1341bfa83a9eSThomas Graf * nla_get_msecs - return payload of msecs attribute 1342bfa83a9eSThomas Graf * @nla: msecs netlink attribute 1343bfa83a9eSThomas Graf * 1344bfa83a9eSThomas Graf * Returns the number of milliseconds in jiffies. 1345bfa83a9eSThomas Graf */ 1346b057efd4SPatrick McHardy static inline unsigned long nla_get_msecs(const struct nlattr *nla) 1347bfa83a9eSThomas Graf { 1348bfa83a9eSThomas Graf u64 msecs = nla_get_u64(nla); 1349bfa83a9eSThomas Graf 1350bfa83a9eSThomas Graf return msecs_to_jiffies((unsigned long) msecs); 1351bfa83a9eSThomas Graf } 1352bfa83a9eSThomas Graf 1353bfa83a9eSThomas Graf /** 135467b61f6cSJiri Benc * nla_get_in_addr - return payload of IPv4 address attribute 135567b61f6cSJiri Benc * @nla: IPv4 address netlink attribute 135667b61f6cSJiri Benc */ 135767b61f6cSJiri Benc static inline __be32 nla_get_in_addr(const struct nlattr *nla) 135867b61f6cSJiri Benc { 135967b61f6cSJiri Benc return *(__be32 *) nla_data(nla); 136067b61f6cSJiri Benc } 136167b61f6cSJiri Benc 136267b61f6cSJiri Benc /** 136367b61f6cSJiri Benc * nla_get_in6_addr - return payload of IPv6 address attribute 136467b61f6cSJiri Benc * @nla: IPv6 address netlink attribute 136567b61f6cSJiri Benc */ 136667b61f6cSJiri Benc static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla) 136767b61f6cSJiri Benc { 136867b61f6cSJiri Benc struct in6_addr tmp; 136967b61f6cSJiri Benc 137067b61f6cSJiri Benc nla_memcpy(&tmp, nla, sizeof(tmp)); 137167b61f6cSJiri Benc return tmp; 137267b61f6cSJiri Benc } 137367b61f6cSJiri Benc 137467b61f6cSJiri Benc /** 137564c83d83SJamal Hadi Salim * nla_get_bitfield32 - return payload of 32 bitfield attribute 137664c83d83SJamal Hadi Salim * @nla: nla_bitfield32 attribute 137764c83d83SJamal Hadi Salim */ 137864c83d83SJamal Hadi Salim static inline struct nla_bitfield32 nla_get_bitfield32(const struct nlattr *nla) 137964c83d83SJamal Hadi Salim { 138064c83d83SJamal Hadi Salim struct nla_bitfield32 tmp; 138164c83d83SJamal Hadi Salim 138264c83d83SJamal Hadi Salim nla_memcpy(&tmp, nla, sizeof(tmp)); 138364c83d83SJamal Hadi Salim return tmp; 138464c83d83SJamal Hadi Salim } 138564c83d83SJamal Hadi Salim 138664c83d83SJamal Hadi Salim /** 1387b15ca182SThomas Graf * nla_memdup - duplicate attribute memory (kmemdup) 1388b15ca182SThomas Graf * @src: netlink attribute to duplicate from 1389b15ca182SThomas Graf * @gfp: GFP mask 1390b15ca182SThomas Graf */ 1391b15ca182SThomas Graf static inline void *nla_memdup(const struct nlattr *src, gfp_t gfp) 1392b15ca182SThomas Graf { 1393b15ca182SThomas Graf return kmemdup(nla_data(src), nla_len(src), gfp); 1394b15ca182SThomas Graf } 1395b15ca182SThomas Graf 1396b15ca182SThomas Graf /** 1397bfa83a9eSThomas Graf * nla_nest_start - Start a new level of nested attributes 1398bfa83a9eSThomas Graf * @skb: socket buffer to add attributes to 1399bfa83a9eSThomas Graf * @attrtype: attribute type of container 1400bfa83a9eSThomas Graf * 1401bfa83a9eSThomas Graf * Returns the container attribute 1402bfa83a9eSThomas Graf */ 1403bfa83a9eSThomas Graf static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) 1404bfa83a9eSThomas Graf { 140527a884dcSArnaldo Carvalho de Melo struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); 1406bfa83a9eSThomas Graf 1407bfa83a9eSThomas Graf if (nla_put(skb, attrtype, 0, NULL) < 0) 1408bfa83a9eSThomas Graf return NULL; 1409bfa83a9eSThomas Graf 1410bfa83a9eSThomas Graf return start; 1411bfa83a9eSThomas Graf } 1412bfa83a9eSThomas Graf 1413bfa83a9eSThomas Graf /** 1414bfa83a9eSThomas Graf * nla_nest_end - Finalize nesting of attributes 1415d1ec3b77SPierre Ynard * @skb: socket buffer the attributes are stored in 1416bfa83a9eSThomas Graf * @start: container attribute 1417bfa83a9eSThomas Graf * 1418bfa83a9eSThomas Graf * Corrects the container attribute header to include the all 1419bfa83a9eSThomas Graf * appeneded attributes. 1420bfa83a9eSThomas Graf * 1421bfa83a9eSThomas Graf * Returns the total data length of the skb. 1422bfa83a9eSThomas Graf */ 1423bfa83a9eSThomas Graf static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) 1424bfa83a9eSThomas Graf { 142527a884dcSArnaldo Carvalho de Melo start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; 1426bfa83a9eSThomas Graf return skb->len; 1427bfa83a9eSThomas Graf } 1428bfa83a9eSThomas Graf 1429bfa83a9eSThomas Graf /** 1430bfa83a9eSThomas Graf * nla_nest_cancel - Cancel nesting of attributes 1431bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 1432bfa83a9eSThomas Graf * @start: container attribute 1433bfa83a9eSThomas Graf * 1434bfa83a9eSThomas Graf * Removes the container attribute and including all nested 1435bc3ed28cSThomas Graf * attributes. Returns -EMSGSIZE 1436bfa83a9eSThomas Graf */ 1437bc3ed28cSThomas Graf static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) 1438bfa83a9eSThomas Graf { 1439bc3ed28cSThomas Graf nlmsg_trim(skb, start); 1440bfa83a9eSThomas Graf } 1441bfa83a9eSThomas Graf 1442bfa83a9eSThomas Graf /** 14434fe5d5c0SPaul Moore * nla_validate_nested - Validate a stream of nested attributes 14444fe5d5c0SPaul Moore * @start: container attribute 14454fe5d5c0SPaul Moore * @maxtype: maximum attribute type to be expected 14464fe5d5c0SPaul Moore * @policy: validation policy 1447fceb6435SJohannes Berg * @extack: extended ACK report struct 14484fe5d5c0SPaul Moore * 14494fe5d5c0SPaul Moore * Validates all attributes in the nested attribute stream against the 14504fe5d5c0SPaul Moore * specified policy. Attributes with a type exceeding maxtype will be 14514fe5d5c0SPaul Moore * ignored. See documenation of struct nla_policy for more details. 14524fe5d5c0SPaul Moore * 14534fe5d5c0SPaul Moore * Returns 0 on success or a negative error code. 14544fe5d5c0SPaul Moore */ 14553654654fSJan Engelhardt static inline int nla_validate_nested(const struct nlattr *start, int maxtype, 1456fceb6435SJohannes Berg const struct nla_policy *policy, 1457fceb6435SJohannes Berg struct netlink_ext_ack *extack) 14584fe5d5c0SPaul Moore { 1459fceb6435SJohannes Berg return nla_validate(nla_data(start), nla_len(start), maxtype, policy, 1460fceb6435SJohannes Berg extack); 14614fe5d5c0SPaul Moore } 14624fe5d5c0SPaul Moore 14634fe5d5c0SPaul Moore /** 1464089bf1a6SNicolas Dichtel * nla_need_padding_for_64bit - test 64-bit alignment of the next attribute 1465089bf1a6SNicolas Dichtel * @skb: socket buffer the message is stored in 1466089bf1a6SNicolas Dichtel * 1467089bf1a6SNicolas Dichtel * Return true if padding is needed to align the next attribute (nla_data()) to 1468089bf1a6SNicolas Dichtel * a 64-bit aligned area. 1469089bf1a6SNicolas Dichtel */ 1470089bf1a6SNicolas Dichtel static inline bool nla_need_padding_for_64bit(struct sk_buff *skb) 1471089bf1a6SNicolas Dichtel { 1472089bf1a6SNicolas Dichtel #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 1473089bf1a6SNicolas Dichtel /* The nlattr header is 4 bytes in size, that's why we test 1474089bf1a6SNicolas Dichtel * if the skb->data _is_ aligned. A NOP attribute, plus 1475089bf1a6SNicolas Dichtel * nlattr header for next attribute, will make nla_data() 1476089bf1a6SNicolas Dichtel * 8-byte aligned. 1477089bf1a6SNicolas Dichtel */ 1478089bf1a6SNicolas Dichtel if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8)) 1479089bf1a6SNicolas Dichtel return true; 1480089bf1a6SNicolas Dichtel #endif 1481089bf1a6SNicolas Dichtel return false; 1482089bf1a6SNicolas Dichtel } 1483089bf1a6SNicolas Dichtel 1484089bf1a6SNicolas Dichtel /** 148535c58459SDavid S. Miller * nla_align_64bit - 64-bit align the nla_data() of next attribute 148635c58459SDavid S. Miller * @skb: socket buffer the message is stored in 148735c58459SDavid S. Miller * @padattr: attribute type for the padding 148835c58459SDavid S. Miller * 148935c58459SDavid S. Miller * Conditionally emit a padding netlink attribute in order to make 149035c58459SDavid S. Miller * the next attribute we emit have a 64-bit aligned nla_data() area. 149135c58459SDavid S. Miller * This will only be done in architectures which do not have 1492cca1d815SEric Dumazet * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined. 149335c58459SDavid S. Miller * 149435c58459SDavid S. Miller * Returns zero on success or a negative error code. 149535c58459SDavid S. Miller */ 149635c58459SDavid S. Miller static inline int nla_align_64bit(struct sk_buff *skb, int padattr) 149735c58459SDavid S. Miller { 1498089bf1a6SNicolas Dichtel if (nla_need_padding_for_64bit(skb) && 1499cca1d815SEric Dumazet !nla_reserve(skb, padattr, 0)) 150035c58459SDavid S. Miller return -EMSGSIZE; 1501089bf1a6SNicolas Dichtel 150235c58459SDavid S. Miller return 0; 150335c58459SDavid S. Miller } 150435c58459SDavid S. Miller 150535c58459SDavid S. Miller /** 150635c58459SDavid S. Miller * nla_total_size_64bit - total length of attribute including padding 150735c58459SDavid S. Miller * @payload: length of payload 150835c58459SDavid S. Miller */ 150935c58459SDavid S. Miller static inline int nla_total_size_64bit(int payload) 151035c58459SDavid S. Miller { 151135c58459SDavid S. Miller return NLA_ALIGN(nla_attr_size(payload)) 1512cca1d815SEric Dumazet #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 151335c58459SDavid S. Miller + NLA_ALIGN(nla_attr_size(0)) 151435c58459SDavid S. Miller #endif 151535c58459SDavid S. Miller ; 151635c58459SDavid S. Miller } 151735c58459SDavid S. Miller 151835c58459SDavid S. Miller /** 1519bfa83a9eSThomas Graf * nla_for_each_attr - iterate over a stream of attributes 1520bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 1521bfa83a9eSThomas Graf * @head: head of attribute stream 1522bfa83a9eSThomas Graf * @len: length of attribute stream 1523bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 1524bfa83a9eSThomas Graf */ 1525bfa83a9eSThomas Graf #define nla_for_each_attr(pos, head, len, rem) \ 1526bfa83a9eSThomas Graf for (pos = head, rem = len; \ 1527bfa83a9eSThomas Graf nla_ok(pos, rem); \ 1528bfa83a9eSThomas Graf pos = nla_next(pos, &(rem))) 1529bfa83a9eSThomas Graf 1530fe4944e5SThomas Graf /** 1531fe4944e5SThomas Graf * nla_for_each_nested - iterate over nested attributes 1532fe4944e5SThomas Graf * @pos: loop counter, set to current attribute 1533fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 1534fe4944e5SThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 1535fe4944e5SThomas Graf */ 1536fe4944e5SThomas Graf #define nla_for_each_nested(pos, nla, rem) \ 1537fe4944e5SThomas Graf nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) 1538fe4944e5SThomas Graf 1539941d8ebcSSimon Horman /** 1540941d8ebcSSimon Horman * nla_is_last - Test if attribute is last in stream 1541941d8ebcSSimon Horman * @nla: attribute to test 1542941d8ebcSSimon Horman * @rem: bytes remaining in stream 1543941d8ebcSSimon Horman */ 1544941d8ebcSSimon Horman static inline bool nla_is_last(const struct nlattr *nla, int rem) 1545941d8ebcSSimon Horman { 1546941d8ebcSSimon Horman return nla->nla_len == rem; 1547941d8ebcSSimon Horman } 1548941d8ebcSSimon Horman 1549bfa83a9eSThomas Graf #endif 1550