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 30923323289SJohannes Berg #define _NLA_POLICY_NESTED(maxattr, policy) \ 3109a659a35SJohannes Berg { .type = NLA_NESTED, .validation_data = policy, .len = maxattr } 31123323289SJohannes Berg #define _NLA_POLICY_NESTED_ARRAY(maxattr, policy) \ 3121501d135SJohannes Berg { .type = NLA_NESTED_ARRAY, .validation_data = policy, .len = maxattr } 31323323289SJohannes Berg #define NLA_POLICY_NESTED(policy) \ 31423323289SJohannes Berg _NLA_POLICY_NESTED(ARRAY_SIZE(policy) - 1, policy) 31523323289SJohannes Berg #define NLA_POLICY_NESTED_ARRAY(policy) \ 31623323289SJohannes Berg _NLA_POLICY_NESTED_ARRAY(ARRAY_SIZE(policy) - 1, policy) 3179a659a35SJohannes Berg 3185886d932SJohannes Berg #define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition)) 3193e48be05SJohannes Berg #define NLA_ENSURE_INT_TYPE(tp) \ 3203e48be05SJohannes Berg (__NLA_ENSURE(tp == NLA_S8 || tp == NLA_U8 || \ 3213e48be05SJohannes Berg tp == NLA_S16 || tp == NLA_U16 || \ 3223e48be05SJohannes Berg tp == NLA_S32 || tp == NLA_U32 || \ 3233e48be05SJohannes Berg tp == NLA_S64 || tp == NLA_U64) + tp) 32433188bd6SJohannes Berg #define NLA_ENSURE_NO_VALIDATION_PTR(tp) \ 32533188bd6SJohannes Berg (__NLA_ENSURE(tp != NLA_BITFIELD32 && \ 32633188bd6SJohannes Berg tp != NLA_REJECT && \ 32733188bd6SJohannes Berg tp != NLA_NESTED && \ 32833188bd6SJohannes Berg tp != NLA_NESTED_ARRAY) + tp) 3293e48be05SJohannes Berg 3303e48be05SJohannes Berg #define NLA_POLICY_RANGE(tp, _min, _max) { \ 3313e48be05SJohannes Berg .type = NLA_ENSURE_INT_TYPE(tp), \ 3323e48be05SJohannes Berg .validation_type = NLA_VALIDATE_RANGE, \ 3333e48be05SJohannes Berg .min = _min, \ 3343e48be05SJohannes Berg .max = _max \ 3353e48be05SJohannes Berg } 3363e48be05SJohannes Berg 3373e48be05SJohannes Berg #define NLA_POLICY_MIN(tp, _min) { \ 3383e48be05SJohannes Berg .type = NLA_ENSURE_INT_TYPE(tp), \ 3393e48be05SJohannes Berg .validation_type = NLA_VALIDATE_MIN, \ 3403e48be05SJohannes Berg .min = _min, \ 3413e48be05SJohannes Berg } 3423e48be05SJohannes Berg 3433e48be05SJohannes Berg #define NLA_POLICY_MAX(tp, _max) { \ 3443e48be05SJohannes Berg .type = NLA_ENSURE_INT_TYPE(tp), \ 3453e48be05SJohannes Berg .validation_type = NLA_VALIDATE_MAX, \ 3463e48be05SJohannes Berg .max = _max, \ 3473e48be05SJohannes Berg } 3483e48be05SJohannes Berg 34933188bd6SJohannes Berg #define NLA_POLICY_VALIDATE_FN(tp, fn, ...) { \ 35033188bd6SJohannes Berg .type = NLA_ENSURE_NO_VALIDATION_PTR(tp), \ 35133188bd6SJohannes Berg .validation_type = NLA_VALIDATE_FUNCTION, \ 35233188bd6SJohannes Berg .validate = fn, \ 35333188bd6SJohannes Berg .len = __VA_ARGS__ + 0, \ 35433188bd6SJohannes Berg } 35533188bd6SJohannes Berg 3564e902c57SThomas Graf /** 3574e902c57SThomas Graf * struct nl_info - netlink source information 3584e902c57SThomas Graf * @nlh: Netlink message header of original request 35915e47304SEric W. Biederman * @portid: Netlink PORTID of requesting application 3604e902c57SThomas Graf */ 3614e902c57SThomas Graf struct nl_info { 3624e902c57SThomas Graf struct nlmsghdr *nlh; 3634d1169c1SDenis V. Lunev struct net *nl_net; 36415e47304SEric W. Biederman u32 portid; 3653b1137feSDavid Ahern bool skip_notify; 3664e902c57SThomas Graf }; 3674e902c57SThomas Graf 3684f69053bSJoe Perches int netlink_rcv_skb(struct sk_buff *skb, 3692d4bc933SJohannes Berg int (*cb)(struct sk_buff *, struct nlmsghdr *, 3702d4bc933SJohannes Berg struct netlink_ext_ack *)); 3714f69053bSJoe Perches int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, 3724f69053bSJoe Perches unsigned int group, int report, gfp_t flags); 37382ace47aSThomas Graf 3744f69053bSJoe Perches int nla_validate(const struct nlattr *head, int len, int maxtype, 375fceb6435SJohannes Berg const struct nla_policy *policy, 376fceb6435SJohannes Berg struct netlink_ext_ack *extack); 3774f69053bSJoe Perches int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head, 378fceb6435SJohannes Berg int len, const struct nla_policy *policy, 379fceb6435SJohannes Berg struct netlink_ext_ack *extack); 380a5f6cba2SDavid Ahern int nla_parse_strict(struct nlattr **tb, int maxtype, const struct nlattr *head, 381a5f6cba2SDavid Ahern int len, const struct nla_policy *policy, 382a5f6cba2SDavid Ahern struct netlink_ext_ack *extack); 3834f69053bSJoe Perches int nla_policy_len(const struct nla_policy *, int); 3844f69053bSJoe Perches struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype); 3854f69053bSJoe Perches size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize); 3862cf0c8b3SPhil Sutter char *nla_strdup(const struct nlattr *nla, gfp_t flags); 3874f69053bSJoe Perches int nla_memcpy(void *dest, const struct nlattr *src, int count); 3884f69053bSJoe Perches int nla_memcmp(const struct nlattr *nla, const void *data, size_t size); 3894f69053bSJoe Perches int nla_strcmp(const struct nlattr *nla, const char *str); 3904f69053bSJoe Perches struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); 391089bf1a6SNicolas Dichtel struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, 392089bf1a6SNicolas Dichtel int attrlen, int padattr); 3934f69053bSJoe Perches void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 3944f69053bSJoe Perches struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); 395089bf1a6SNicolas Dichtel struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, 396089bf1a6SNicolas Dichtel int attrlen, int padattr); 3974f69053bSJoe Perches void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 3984f69053bSJoe Perches void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, 399fe4944e5SThomas Graf const void *data); 400089bf1a6SNicolas Dichtel void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, 401089bf1a6SNicolas Dichtel const void *data, int padattr); 4024f69053bSJoe Perches void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); 4034f69053bSJoe Perches int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data); 404089bf1a6SNicolas Dichtel int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, 405089bf1a6SNicolas Dichtel const void *data, int padattr); 4064f69053bSJoe Perches int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); 4074f69053bSJoe Perches int nla_append(struct sk_buff *skb, int attrlen, const void *data); 408bfa83a9eSThomas Graf 409bfa83a9eSThomas Graf /************************************************************************** 410bfa83a9eSThomas Graf * Netlink Messages 411bfa83a9eSThomas Graf **************************************************************************/ 412bfa83a9eSThomas Graf 413bfa83a9eSThomas Graf /** 414bfa83a9eSThomas Graf * nlmsg_msg_size - length of netlink message not including padding 415bfa83a9eSThomas Graf * @payload: length of message payload 416bfa83a9eSThomas Graf */ 417bfa83a9eSThomas Graf static inline int nlmsg_msg_size(int payload) 418bfa83a9eSThomas Graf { 419bfa83a9eSThomas Graf return NLMSG_HDRLEN + payload; 420bfa83a9eSThomas Graf } 421bfa83a9eSThomas Graf 422bfa83a9eSThomas Graf /** 423bfa83a9eSThomas Graf * nlmsg_total_size - length of netlink message including padding 424bfa83a9eSThomas Graf * @payload: length of message payload 425bfa83a9eSThomas Graf */ 426bfa83a9eSThomas Graf static inline int nlmsg_total_size(int payload) 427bfa83a9eSThomas Graf { 428bfa83a9eSThomas Graf return NLMSG_ALIGN(nlmsg_msg_size(payload)); 429bfa83a9eSThomas Graf } 430bfa83a9eSThomas Graf 431bfa83a9eSThomas Graf /** 432bfa83a9eSThomas Graf * nlmsg_padlen - length of padding at the message's tail 433bfa83a9eSThomas Graf * @payload: length of message payload 434bfa83a9eSThomas Graf */ 435bfa83a9eSThomas Graf static inline int nlmsg_padlen(int payload) 436bfa83a9eSThomas Graf { 437bfa83a9eSThomas Graf return nlmsg_total_size(payload) - nlmsg_msg_size(payload); 438bfa83a9eSThomas Graf } 439bfa83a9eSThomas Graf 440bfa83a9eSThomas Graf /** 441bfa83a9eSThomas Graf * nlmsg_data - head of message payload 44270f23fd6SJustin P. Mattock * @nlh: netlink message header 443bfa83a9eSThomas Graf */ 444bfa83a9eSThomas Graf static inline void *nlmsg_data(const struct nlmsghdr *nlh) 445bfa83a9eSThomas Graf { 446bfa83a9eSThomas Graf return (unsigned char *) nlh + NLMSG_HDRLEN; 447bfa83a9eSThomas Graf } 448bfa83a9eSThomas Graf 449bfa83a9eSThomas Graf /** 450bfa83a9eSThomas Graf * nlmsg_len - length of message payload 451bfa83a9eSThomas Graf * @nlh: netlink message header 452bfa83a9eSThomas Graf */ 453bfa83a9eSThomas Graf static inline int nlmsg_len(const struct nlmsghdr *nlh) 454bfa83a9eSThomas Graf { 455bfa83a9eSThomas Graf return nlh->nlmsg_len - NLMSG_HDRLEN; 456bfa83a9eSThomas Graf } 457bfa83a9eSThomas Graf 458bfa83a9eSThomas Graf /** 459bfa83a9eSThomas Graf * nlmsg_attrdata - head of attributes data 460bfa83a9eSThomas Graf * @nlh: netlink message header 461bfa83a9eSThomas Graf * @hdrlen: length of family specific header 462bfa83a9eSThomas Graf */ 463bfa83a9eSThomas Graf static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, 464bfa83a9eSThomas Graf int hdrlen) 465bfa83a9eSThomas Graf { 466bfa83a9eSThomas Graf unsigned char *data = nlmsg_data(nlh); 467bfa83a9eSThomas Graf return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); 468bfa83a9eSThomas Graf } 469bfa83a9eSThomas Graf 470bfa83a9eSThomas Graf /** 471bfa83a9eSThomas Graf * nlmsg_attrlen - length of attributes data 472bfa83a9eSThomas Graf * @nlh: netlink message header 473bfa83a9eSThomas Graf * @hdrlen: length of family specific header 474bfa83a9eSThomas Graf */ 475bfa83a9eSThomas Graf static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) 476bfa83a9eSThomas Graf { 477bfa83a9eSThomas Graf return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); 478bfa83a9eSThomas Graf } 479bfa83a9eSThomas Graf 480bfa83a9eSThomas Graf /** 481bfa83a9eSThomas Graf * nlmsg_ok - check if the netlink message fits into the remaining bytes 482bfa83a9eSThomas Graf * @nlh: netlink message header 483bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 484bfa83a9eSThomas Graf */ 485bfa83a9eSThomas Graf static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) 486bfa83a9eSThomas Graf { 487619e803dSVegard Nossum return (remaining >= (int) sizeof(struct nlmsghdr) && 488bfa83a9eSThomas Graf nlh->nlmsg_len >= sizeof(struct nlmsghdr) && 489bfa83a9eSThomas Graf nlh->nlmsg_len <= remaining); 490bfa83a9eSThomas Graf } 491bfa83a9eSThomas Graf 492bfa83a9eSThomas Graf /** 493bfa83a9eSThomas Graf * nlmsg_next - next netlink message in message stream 494bfa83a9eSThomas Graf * @nlh: netlink message header 495bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 496bfa83a9eSThomas Graf * 497bfa83a9eSThomas Graf * Returns the next netlink message in the message stream and 498bfa83a9eSThomas Graf * decrements remaining by the size of the current message. 499bfa83a9eSThomas Graf */ 5003654654fSJan Engelhardt static inline struct nlmsghdr * 5013654654fSJan Engelhardt nlmsg_next(const struct nlmsghdr *nlh, int *remaining) 502bfa83a9eSThomas Graf { 503bfa83a9eSThomas Graf int totlen = NLMSG_ALIGN(nlh->nlmsg_len); 504bfa83a9eSThomas Graf 505bfa83a9eSThomas Graf *remaining -= totlen; 506bfa83a9eSThomas Graf 507bfa83a9eSThomas Graf return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); 508bfa83a9eSThomas Graf } 509bfa83a9eSThomas Graf 510bfa83a9eSThomas Graf /** 511bfa83a9eSThomas Graf * nlmsg_parse - parse attributes of a netlink message 512bfa83a9eSThomas Graf * @nlh: netlink message header 513bfa83a9eSThomas Graf * @hdrlen: length of family specific header 514bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 515bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 516bfa83a9eSThomas Graf * @policy: validation policy 517fceb6435SJohannes Berg * @extack: extended ACK report struct 518bfa83a9eSThomas Graf * 519bfa83a9eSThomas Graf * See nla_parse() 520bfa83a9eSThomas Graf */ 5213a6c2b41SPatrick McHardy static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, 522bfa83a9eSThomas Graf struct nlattr *tb[], int maxtype, 523fceb6435SJohannes Berg const struct nla_policy *policy, 524fceb6435SJohannes Berg struct netlink_ext_ack *extack) 525bfa83a9eSThomas Graf { 5263d0d4337SDavid Ahern if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) { 5273d0d4337SDavid Ahern NL_SET_ERR_MSG(extack, "Invalid header length"); 528bfa83a9eSThomas Graf return -EINVAL; 5293d0d4337SDavid Ahern } 530bfa83a9eSThomas Graf 531bfa83a9eSThomas Graf return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), 532fceb6435SJohannes Berg nlmsg_attrlen(nlh, hdrlen), policy, extack); 533bfa83a9eSThomas Graf } 534bfa83a9eSThomas Graf 535a5f6cba2SDavid Ahern static inline int nlmsg_parse_strict(const struct nlmsghdr *nlh, int hdrlen, 536a5f6cba2SDavid Ahern struct nlattr *tb[], int maxtype, 537a5f6cba2SDavid Ahern const struct nla_policy *policy, 538a5f6cba2SDavid Ahern struct netlink_ext_ack *extack) 539a5f6cba2SDavid Ahern { 540a5f6cba2SDavid Ahern if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) { 541a5f6cba2SDavid Ahern NL_SET_ERR_MSG(extack, "Invalid header length"); 542a5f6cba2SDavid Ahern return -EINVAL; 543a5f6cba2SDavid Ahern } 544a5f6cba2SDavid Ahern 545a5f6cba2SDavid Ahern return nla_parse_strict(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), 546a5f6cba2SDavid Ahern nlmsg_attrlen(nlh, hdrlen), policy, extack); 547a5f6cba2SDavid Ahern } 548a5f6cba2SDavid Ahern 549bfa83a9eSThomas Graf /** 550bfa83a9eSThomas Graf * nlmsg_find_attr - find a specific attribute in a netlink message 551bfa83a9eSThomas Graf * @nlh: netlink message header 552bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 553bfa83a9eSThomas Graf * @attrtype: type of attribute to look for 554bfa83a9eSThomas Graf * 555bfa83a9eSThomas Graf * Returns the first attribute which matches the specified type. 556bfa83a9eSThomas Graf */ 5576b8c92baSNelson Elhage static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, 558bfa83a9eSThomas Graf int hdrlen, int attrtype) 559bfa83a9eSThomas Graf { 560bfa83a9eSThomas Graf return nla_find(nlmsg_attrdata(nlh, hdrlen), 561bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), attrtype); 562bfa83a9eSThomas Graf } 563bfa83a9eSThomas Graf 564bfa83a9eSThomas Graf /** 565bfa83a9eSThomas Graf * nlmsg_validate - validate a netlink message including attributes 566bfa83a9eSThomas Graf * @nlh: netlinket message header 567bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 568bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 569bfa83a9eSThomas Graf * @policy: validation policy 570fceb6435SJohannes Berg * @extack: extended ACK report struct 571bfa83a9eSThomas Graf */ 5723654654fSJan Engelhardt static inline int nlmsg_validate(const struct nlmsghdr *nlh, 5733654654fSJan Engelhardt int hdrlen, int maxtype, 574fceb6435SJohannes Berg const struct nla_policy *policy, 575fceb6435SJohannes Berg struct netlink_ext_ack *extack) 576bfa83a9eSThomas Graf { 577bfa83a9eSThomas Graf if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) 578bfa83a9eSThomas Graf return -EINVAL; 579bfa83a9eSThomas Graf 580bfa83a9eSThomas Graf return nla_validate(nlmsg_attrdata(nlh, hdrlen), 581fceb6435SJohannes Berg nlmsg_attrlen(nlh, hdrlen), maxtype, policy, 582fceb6435SJohannes Berg extack); 583bfa83a9eSThomas Graf } 584bfa83a9eSThomas Graf 585bfa83a9eSThomas Graf /** 58697676b6bSThomas Graf * nlmsg_report - need to report back to application? 58797676b6bSThomas Graf * @nlh: netlink message header 58897676b6bSThomas Graf * 58997676b6bSThomas Graf * Returns 1 if a report back to the application is requested. 59097676b6bSThomas Graf */ 5913a6c2b41SPatrick McHardy static inline int nlmsg_report(const struct nlmsghdr *nlh) 59297676b6bSThomas Graf { 59397676b6bSThomas Graf return !!(nlh->nlmsg_flags & NLM_F_ECHO); 59497676b6bSThomas Graf } 59597676b6bSThomas Graf 59697676b6bSThomas Graf /** 597bfa83a9eSThomas Graf * nlmsg_for_each_attr - iterate over a stream of attributes 598bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 599bfa83a9eSThomas Graf * @nlh: netlink message header 600bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 601bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 602bfa83a9eSThomas Graf */ 603bfa83a9eSThomas Graf #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ 604bfa83a9eSThomas Graf nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ 605bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), rem) 606bfa83a9eSThomas Graf 607bfa83a9eSThomas Graf /** 608bfa83a9eSThomas Graf * nlmsg_put - Add a new netlink message to an skb 609bfa83a9eSThomas Graf * @skb: socket buffer to store message in 6102c6ba4b1SNicolas Dichtel * @portid: netlink PORTID of requesting application 611bfa83a9eSThomas Graf * @seq: sequence number of message 612bfa83a9eSThomas Graf * @type: message type 613bfa83a9eSThomas Graf * @payload: length of message payload 614bfa83a9eSThomas Graf * @flags: message flags 615bfa83a9eSThomas Graf * 616bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 617bfa83a9eSThomas Graf * the message header and payload. 618bfa83a9eSThomas Graf */ 61915e47304SEric W. Biederman static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, 620bfa83a9eSThomas Graf int type, int payload, int flags) 621bfa83a9eSThomas Graf { 622bfa83a9eSThomas Graf if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) 623bfa83a9eSThomas Graf return NULL; 624bfa83a9eSThomas Graf 62515e47304SEric W. Biederman return __nlmsg_put(skb, portid, seq, type, payload, flags); 626bfa83a9eSThomas Graf } 627bfa83a9eSThomas Graf 628bfa83a9eSThomas Graf /** 629bfa83a9eSThomas Graf * nlmsg_put_answer - Add a new callback based netlink message to an skb 630bfa83a9eSThomas Graf * @skb: socket buffer to store message in 631bfa83a9eSThomas Graf * @cb: netlink callback 632bfa83a9eSThomas Graf * @type: message type 633bfa83a9eSThomas Graf * @payload: length of message payload 634bfa83a9eSThomas Graf * @flags: message flags 635bfa83a9eSThomas Graf * 636bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 637bfa83a9eSThomas Graf * the message header and payload. 638bfa83a9eSThomas Graf */ 639bfa83a9eSThomas Graf static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, 640bfa83a9eSThomas Graf struct netlink_callback *cb, 641bfa83a9eSThomas Graf int type, int payload, 642bfa83a9eSThomas Graf int flags) 643bfa83a9eSThomas Graf { 64415e47304SEric W. Biederman return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 645bfa83a9eSThomas Graf type, payload, flags); 646bfa83a9eSThomas Graf } 647bfa83a9eSThomas Graf 648bfa83a9eSThomas Graf /** 649bfa83a9eSThomas Graf * nlmsg_new - Allocate a new netlink message 650339bf98fSThomas Graf * @payload: size of the message payload 651fe4944e5SThomas Graf * @flags: the type of memory to allocate. 652bfa83a9eSThomas Graf * 653339bf98fSThomas Graf * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known 654339bf98fSThomas Graf * and a good default is needed. 655bfa83a9eSThomas Graf */ 656339bf98fSThomas Graf static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) 657bfa83a9eSThomas Graf { 658339bf98fSThomas Graf return alloc_skb(nlmsg_total_size(payload), flags); 659bfa83a9eSThomas Graf } 660bfa83a9eSThomas Graf 661bfa83a9eSThomas Graf /** 662bfa83a9eSThomas Graf * nlmsg_end - Finalize a netlink message 663bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 664bfa83a9eSThomas Graf * @nlh: netlink message header 665bfa83a9eSThomas Graf * 666bfa83a9eSThomas Graf * Corrects the netlink message header to include the appeneded 667bfa83a9eSThomas Graf * attributes. Only necessary if attributes have been added to 668bfa83a9eSThomas Graf * the message. 669bfa83a9eSThomas Graf */ 670053c095aSJohannes Berg static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) 671bfa83a9eSThomas Graf { 67227a884dcSArnaldo Carvalho de Melo nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; 673bfa83a9eSThomas Graf } 674bfa83a9eSThomas Graf 675bfa83a9eSThomas Graf /** 676fe4944e5SThomas Graf * nlmsg_get_pos - return current position in netlink message 677fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 678fe4944e5SThomas Graf * 679fe4944e5SThomas Graf * Returns a pointer to the current tail of the message. 680fe4944e5SThomas Graf */ 681fe4944e5SThomas Graf static inline void *nlmsg_get_pos(struct sk_buff *skb) 682fe4944e5SThomas Graf { 68327a884dcSArnaldo Carvalho de Melo return skb_tail_pointer(skb); 684fe4944e5SThomas Graf } 685fe4944e5SThomas Graf 686fe4944e5SThomas Graf /** 687fe4944e5SThomas Graf * nlmsg_trim - Trim message to a mark 688fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 689fe4944e5SThomas Graf * @mark: mark to trim to 690fe4944e5SThomas Graf * 691bc3ed28cSThomas Graf * Trims the message to the provided mark. 692fe4944e5SThomas Graf */ 693bc3ed28cSThomas Graf static inline void nlmsg_trim(struct sk_buff *skb, const void *mark) 694fe4944e5SThomas Graf { 695149118d8SThomas Graf if (mark) { 696149118d8SThomas Graf WARN_ON((unsigned char *) mark < skb->data); 697fe4944e5SThomas Graf skb_trim(skb, (unsigned char *) mark - skb->data); 698fe4944e5SThomas Graf } 699149118d8SThomas Graf } 700fe4944e5SThomas Graf 701fe4944e5SThomas Graf /** 702bfa83a9eSThomas Graf * nlmsg_cancel - Cancel construction of a netlink message 703bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 704bfa83a9eSThomas Graf * @nlh: netlink message header 705bfa83a9eSThomas Graf * 706bfa83a9eSThomas Graf * Removes the complete netlink message including all 707bc3ed28cSThomas Graf * attributes from the socket buffer again. 708bfa83a9eSThomas Graf */ 709bc3ed28cSThomas Graf static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) 710bfa83a9eSThomas Graf { 711bc3ed28cSThomas Graf nlmsg_trim(skb, nlh); 712bfa83a9eSThomas Graf } 713bfa83a9eSThomas Graf 714bfa83a9eSThomas Graf /** 715bfa83a9eSThomas Graf * nlmsg_free - free a netlink message 716bfa83a9eSThomas Graf * @skb: socket buffer of netlink message 717bfa83a9eSThomas Graf */ 718bfa83a9eSThomas Graf static inline void nlmsg_free(struct sk_buff *skb) 719bfa83a9eSThomas Graf { 720bfa83a9eSThomas Graf kfree_skb(skb); 721bfa83a9eSThomas Graf } 722bfa83a9eSThomas Graf 723bfa83a9eSThomas Graf /** 724bfa83a9eSThomas Graf * nlmsg_multicast - multicast a netlink message 725bfa83a9eSThomas Graf * @sk: netlink socket to spread messages to 726bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 72715e47304SEric W. Biederman * @portid: own netlink portid to avoid sending to yourself 728bfa83a9eSThomas Graf * @group: multicast group id 729d387f6adSThomas Graf * @flags: allocation flags 730bfa83a9eSThomas Graf */ 731bfa83a9eSThomas Graf static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, 73215e47304SEric W. Biederman u32 portid, unsigned int group, gfp_t flags) 733bfa83a9eSThomas Graf { 734bfa83a9eSThomas Graf int err; 735bfa83a9eSThomas Graf 736bfa83a9eSThomas Graf NETLINK_CB(skb).dst_group = group; 737bfa83a9eSThomas Graf 73815e47304SEric W. Biederman err = netlink_broadcast(sk, skb, portid, group, flags); 739bfa83a9eSThomas Graf if (err > 0) 740bfa83a9eSThomas Graf err = 0; 741bfa83a9eSThomas Graf 742bfa83a9eSThomas Graf return err; 743bfa83a9eSThomas Graf } 744bfa83a9eSThomas Graf 745bfa83a9eSThomas Graf /** 746bfa83a9eSThomas Graf * nlmsg_unicast - unicast a netlink message 747bfa83a9eSThomas Graf * @sk: netlink socket to spread message to 748bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 74915e47304SEric W. Biederman * @portid: netlink portid of the destination socket 750bfa83a9eSThomas Graf */ 75115e47304SEric W. Biederman static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid) 752bfa83a9eSThomas Graf { 753bfa83a9eSThomas Graf int err; 754bfa83a9eSThomas Graf 75515e47304SEric W. Biederman err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT); 756bfa83a9eSThomas Graf if (err > 0) 757bfa83a9eSThomas Graf err = 0; 758bfa83a9eSThomas Graf 759bfa83a9eSThomas Graf return err; 760bfa83a9eSThomas Graf } 761bfa83a9eSThomas Graf 762bfa83a9eSThomas Graf /** 763bfa83a9eSThomas Graf * nlmsg_for_each_msg - iterate over a stream of messages 764bfa83a9eSThomas Graf * @pos: loop counter, set to current message 765bfa83a9eSThomas Graf * @head: head of message stream 766bfa83a9eSThomas Graf * @len: length of message stream 767bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 768bfa83a9eSThomas Graf */ 769bfa83a9eSThomas Graf #define nlmsg_for_each_msg(pos, head, len, rem) \ 770bfa83a9eSThomas Graf for (pos = head, rem = len; \ 771bfa83a9eSThomas Graf nlmsg_ok(pos, rem); \ 772bfa83a9eSThomas Graf pos = nlmsg_next(pos, &(rem))) 773bfa83a9eSThomas Graf 774670dc283SJohannes Berg /** 775670dc283SJohannes Berg * nl_dump_check_consistent - check if sequence is consistent and advertise if not 776670dc283SJohannes Berg * @cb: netlink callback structure that stores the sequence number 777670dc283SJohannes Berg * @nlh: netlink message header to write the flag to 778670dc283SJohannes Berg * 779670dc283SJohannes Berg * This function checks if the sequence (generation) number changed during dump 780670dc283SJohannes Berg * and if it did, advertises it in the netlink message header. 781670dc283SJohannes Berg * 782670dc283SJohannes Berg * The correct way to use it is to set cb->seq to the generation counter when 783670dc283SJohannes Berg * all locks for dumping have been acquired, and then call this function for 784670dc283SJohannes Berg * each message that is generated. 785670dc283SJohannes Berg * 786670dc283SJohannes Berg * Note that due to initialisation concerns, 0 is an invalid sequence number 787670dc283SJohannes Berg * and must not be used by code that uses this functionality. 788670dc283SJohannes Berg */ 789670dc283SJohannes Berg static inline void 790670dc283SJohannes Berg nl_dump_check_consistent(struct netlink_callback *cb, 791670dc283SJohannes Berg struct nlmsghdr *nlh) 792670dc283SJohannes Berg { 793670dc283SJohannes Berg if (cb->prev_seq && cb->seq != cb->prev_seq) 794670dc283SJohannes Berg nlh->nlmsg_flags |= NLM_F_DUMP_INTR; 795670dc283SJohannes Berg cb->prev_seq = cb->seq; 796670dc283SJohannes Berg } 797670dc283SJohannes Berg 798bfa83a9eSThomas Graf /************************************************************************** 799bfa83a9eSThomas Graf * Netlink Attributes 800bfa83a9eSThomas Graf **************************************************************************/ 801bfa83a9eSThomas Graf 802bfa83a9eSThomas Graf /** 803bfa83a9eSThomas Graf * nla_attr_size - length of attribute not including padding 804bfa83a9eSThomas Graf * @payload: length of payload 805bfa83a9eSThomas Graf */ 806bfa83a9eSThomas Graf static inline int nla_attr_size(int payload) 807bfa83a9eSThomas Graf { 808bfa83a9eSThomas Graf return NLA_HDRLEN + payload; 809bfa83a9eSThomas Graf } 810bfa83a9eSThomas Graf 811bfa83a9eSThomas Graf /** 812bfa83a9eSThomas Graf * nla_total_size - total length of attribute including padding 813bfa83a9eSThomas Graf * @payload: length of payload 814bfa83a9eSThomas Graf */ 815bfa83a9eSThomas Graf static inline int nla_total_size(int payload) 816bfa83a9eSThomas Graf { 817bfa83a9eSThomas Graf return NLA_ALIGN(nla_attr_size(payload)); 818bfa83a9eSThomas Graf } 819bfa83a9eSThomas Graf 820bfa83a9eSThomas Graf /** 821bfa83a9eSThomas Graf * nla_padlen - length of padding at the tail of attribute 822bfa83a9eSThomas Graf * @payload: length of payload 823bfa83a9eSThomas Graf */ 824bfa83a9eSThomas Graf static inline int nla_padlen(int payload) 825bfa83a9eSThomas Graf { 826bfa83a9eSThomas Graf return nla_total_size(payload) - nla_attr_size(payload); 827bfa83a9eSThomas Graf } 828bfa83a9eSThomas Graf 829bfa83a9eSThomas Graf /** 8308f4c1f9bSThomas Graf * nla_type - attribute type 8318f4c1f9bSThomas Graf * @nla: netlink attribute 8328f4c1f9bSThomas Graf */ 8338f4c1f9bSThomas Graf static inline int nla_type(const struct nlattr *nla) 8348f4c1f9bSThomas Graf { 8358f4c1f9bSThomas Graf return nla->nla_type & NLA_TYPE_MASK; 8368f4c1f9bSThomas Graf } 8378f4c1f9bSThomas Graf 8388f4c1f9bSThomas Graf /** 839bfa83a9eSThomas Graf * nla_data - head of payload 840bfa83a9eSThomas Graf * @nla: netlink attribute 841bfa83a9eSThomas Graf */ 842bfa83a9eSThomas Graf static inline void *nla_data(const struct nlattr *nla) 843bfa83a9eSThomas Graf { 844bfa83a9eSThomas Graf return (char *) nla + NLA_HDRLEN; 845bfa83a9eSThomas Graf } 846bfa83a9eSThomas Graf 847bfa83a9eSThomas Graf /** 848bfa83a9eSThomas Graf * nla_len - length of payload 849bfa83a9eSThomas Graf * @nla: netlink attribute 850bfa83a9eSThomas Graf */ 851bfa83a9eSThomas Graf static inline int nla_len(const struct nlattr *nla) 852bfa83a9eSThomas Graf { 853bfa83a9eSThomas Graf return nla->nla_len - NLA_HDRLEN; 854bfa83a9eSThomas Graf } 855bfa83a9eSThomas Graf 856bfa83a9eSThomas Graf /** 857bfa83a9eSThomas Graf * nla_ok - check if the netlink attribute fits into the remaining bytes 858bfa83a9eSThomas Graf * @nla: netlink attribute 859bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 860bfa83a9eSThomas Graf */ 861bfa83a9eSThomas Graf static inline int nla_ok(const struct nlattr *nla, int remaining) 862bfa83a9eSThomas Graf { 8633e1ed981SAlexey Dobriyan return remaining >= (int) sizeof(*nla) && 8643e1ed981SAlexey Dobriyan nla->nla_len >= sizeof(*nla) && 865bfa83a9eSThomas Graf nla->nla_len <= remaining; 866bfa83a9eSThomas Graf } 867bfa83a9eSThomas Graf 868bfa83a9eSThomas Graf /** 869d1ec3b77SPierre Ynard * nla_next - next netlink attribute in attribute stream 870bfa83a9eSThomas Graf * @nla: netlink attribute 871bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 872bfa83a9eSThomas Graf * 873bfa83a9eSThomas Graf * Returns the next netlink attribute in the attribute stream and 874bfa83a9eSThomas Graf * decrements remaining by the size of the current attribute. 875bfa83a9eSThomas Graf */ 876bfa83a9eSThomas Graf static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) 877bfa83a9eSThomas Graf { 8783b2c75d3SAlexey Dobriyan unsigned int totlen = NLA_ALIGN(nla->nla_len); 879bfa83a9eSThomas Graf 880bfa83a9eSThomas Graf *remaining -= totlen; 881bfa83a9eSThomas Graf return (struct nlattr *) ((char *) nla + totlen); 882bfa83a9eSThomas Graf } 883bfa83a9eSThomas Graf 884bfa83a9eSThomas Graf /** 885fe4944e5SThomas Graf * nla_find_nested - find attribute in a set of nested attributes 886fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 887fe4944e5SThomas Graf * @attrtype: type of attribute to look for 888fe4944e5SThomas Graf * 889fe4944e5SThomas Graf * Returns the first attribute which matches the specified type. 890fe4944e5SThomas Graf */ 8913654654fSJan Engelhardt static inline struct nlattr * 8923654654fSJan Engelhardt nla_find_nested(const struct nlattr *nla, int attrtype) 893fe4944e5SThomas Graf { 894fe4944e5SThomas Graf return nla_find(nla_data(nla), nla_len(nla), attrtype); 895fe4944e5SThomas Graf } 896fe4944e5SThomas Graf 897fe4944e5SThomas Graf /** 898bfa83a9eSThomas Graf * nla_parse_nested - parse nested attributes 899bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 900bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 901bfa83a9eSThomas Graf * @nla: attribute containing the nested attributes 902bfa83a9eSThomas Graf * @policy: validation policy 903fceb6435SJohannes Berg * @extack: extended ACK report struct 904bfa83a9eSThomas Graf * 905bfa83a9eSThomas Graf * See nla_parse() 906bfa83a9eSThomas Graf */ 907bfa83a9eSThomas Graf static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, 908b057efd4SPatrick McHardy const struct nlattr *nla, 909fceb6435SJohannes Berg const struct nla_policy *policy, 910fceb6435SJohannes Berg struct netlink_ext_ack *extack) 911bfa83a9eSThomas Graf { 912fceb6435SJohannes Berg return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy, 913fceb6435SJohannes Berg extack); 914bfa83a9eSThomas Graf } 9151092cb21SPatrick McHardy 9161092cb21SPatrick McHardy /** 917d1ec3b77SPierre Ynard * nla_put_u8 - Add a u8 netlink attribute to a socket buffer 918bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 919bfa83a9eSThomas Graf * @attrtype: attribute type 920bfa83a9eSThomas Graf * @value: numeric value 921bfa83a9eSThomas Graf */ 922bfa83a9eSThomas Graf static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) 923bfa83a9eSThomas Graf { 924b4391db4SArnd Bergmann /* temporary variables to work around GCC PR81715 with asan-stack=1 */ 925b4391db4SArnd Bergmann u8 tmp = value; 926b4391db4SArnd Bergmann 927b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(u8), &tmp); 928bfa83a9eSThomas Graf } 929bfa83a9eSThomas Graf 930bfa83a9eSThomas Graf /** 931bfa83a9eSThomas Graf * nla_put_u16 - Add a u16 netlink attribute to a socket buffer 932bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 933bfa83a9eSThomas Graf * @attrtype: attribute type 934bfa83a9eSThomas Graf * @value: numeric value 935bfa83a9eSThomas Graf */ 936bfa83a9eSThomas Graf static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) 937bfa83a9eSThomas Graf { 938b4391db4SArnd Bergmann u16 tmp = value; 939b4391db4SArnd Bergmann 940b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(u16), &tmp); 941bfa83a9eSThomas Graf } 942bfa83a9eSThomas Graf 943bfa83a9eSThomas Graf /** 944569a8fc3SDavid S. Miller * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer 945569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 946569a8fc3SDavid S. Miller * @attrtype: attribute type 947569a8fc3SDavid S. Miller * @value: numeric value 948569a8fc3SDavid S. Miller */ 949569a8fc3SDavid S. Miller static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value) 950569a8fc3SDavid S. Miller { 951b4391db4SArnd Bergmann __be16 tmp = value; 952b4391db4SArnd Bergmann 953b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__be16), &tmp); 954569a8fc3SDavid S. Miller } 955569a8fc3SDavid S. Miller 956569a8fc3SDavid S. Miller /** 9576c1dd3b6SDavid S. Miller * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer 9586c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 9596c1dd3b6SDavid S. Miller * @attrtype: attribute type 9606c1dd3b6SDavid S. Miller * @value: numeric value 9616c1dd3b6SDavid S. Miller */ 9626c1dd3b6SDavid S. Miller static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value) 9636c1dd3b6SDavid S. Miller { 964b4391db4SArnd Bergmann __be16 tmp = value; 965b4391db4SArnd Bergmann 966b4391db4SArnd Bergmann return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, tmp); 9676c1dd3b6SDavid S. Miller } 9686c1dd3b6SDavid S. Miller 9696c1dd3b6SDavid S. Miller /** 97024c410dcSDavid S. Miller * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer 97124c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 97224c410dcSDavid S. Miller * @attrtype: attribute type 97324c410dcSDavid S. Miller * @value: numeric value 97424c410dcSDavid S. Miller */ 97524c410dcSDavid S. Miller static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value) 97624c410dcSDavid S. Miller { 977b4391db4SArnd Bergmann __le16 tmp = value; 978b4391db4SArnd Bergmann 979b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__le16), &tmp); 98024c410dcSDavid S. Miller } 98124c410dcSDavid S. Miller 98224c410dcSDavid S. Miller /** 983bfa83a9eSThomas Graf * nla_put_u32 - Add a u32 netlink attribute to a socket buffer 984bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 985bfa83a9eSThomas Graf * @attrtype: attribute type 986bfa83a9eSThomas Graf * @value: numeric value 987bfa83a9eSThomas Graf */ 988bfa83a9eSThomas Graf static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) 989bfa83a9eSThomas Graf { 990b4391db4SArnd Bergmann u32 tmp = value; 991b4391db4SArnd Bergmann 992b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(u32), &tmp); 993bfa83a9eSThomas Graf } 994bfa83a9eSThomas Graf 995bfa83a9eSThomas Graf /** 996569a8fc3SDavid S. Miller * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer 997569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 998569a8fc3SDavid S. Miller * @attrtype: attribute type 999569a8fc3SDavid S. Miller * @value: numeric value 1000569a8fc3SDavid S. Miller */ 1001569a8fc3SDavid S. Miller static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value) 1002569a8fc3SDavid S. Miller { 1003b4391db4SArnd Bergmann __be32 tmp = value; 1004b4391db4SArnd Bergmann 1005b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__be32), &tmp); 1006569a8fc3SDavid S. Miller } 1007569a8fc3SDavid S. Miller 1008569a8fc3SDavid S. Miller /** 10096c1dd3b6SDavid S. Miller * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer 10106c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 10116c1dd3b6SDavid S. Miller * @attrtype: attribute type 10126c1dd3b6SDavid S. Miller * @value: numeric value 10136c1dd3b6SDavid S. Miller */ 10146c1dd3b6SDavid S. Miller static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value) 10156c1dd3b6SDavid S. Miller { 1016b4391db4SArnd Bergmann __be32 tmp = value; 1017b4391db4SArnd Bergmann 1018b4391db4SArnd Bergmann return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, tmp); 10196c1dd3b6SDavid S. Miller } 10206c1dd3b6SDavid S. Miller 10216c1dd3b6SDavid S. Miller /** 102224c410dcSDavid S. Miller * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer 102324c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 102424c410dcSDavid S. Miller * @attrtype: attribute type 102524c410dcSDavid S. Miller * @value: numeric value 102624c410dcSDavid S. Miller */ 102724c410dcSDavid S. Miller static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value) 102824c410dcSDavid S. Miller { 1029b4391db4SArnd Bergmann __le32 tmp = value; 1030b4391db4SArnd Bergmann 1031b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__le32), &tmp); 103224c410dcSDavid S. Miller } 103324c410dcSDavid S. Miller 103424c410dcSDavid S. Miller /** 103573520786SNicolas Dichtel * nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it 103673520786SNicolas Dichtel * @skb: socket buffer to add attribute to 103773520786SNicolas Dichtel * @attrtype: attribute type 103873520786SNicolas Dichtel * @value: numeric value 103973520786SNicolas Dichtel * @padattr: attribute type for the padding 104073520786SNicolas Dichtel */ 104173520786SNicolas Dichtel static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype, 104273520786SNicolas Dichtel u64 value, int padattr) 104373520786SNicolas Dichtel { 1044b4391db4SArnd Bergmann u64 tmp = value; 1045b4391db4SArnd Bergmann 1046b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); 104773520786SNicolas Dichtel } 104873520786SNicolas Dichtel 104973520786SNicolas Dichtel /** 1050b46f6dedSNicolas Dichtel * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it 1051569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 1052569a8fc3SDavid S. Miller * @attrtype: attribute type 1053569a8fc3SDavid S. Miller * @value: numeric value 1054b46f6dedSNicolas Dichtel * @padattr: attribute type for the padding 1055569a8fc3SDavid S. Miller */ 1056b46f6dedSNicolas Dichtel static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value, 1057b46f6dedSNicolas Dichtel int padattr) 1058b46f6dedSNicolas Dichtel { 1059b4391db4SArnd Bergmann __be64 tmp = value; 1060b4391db4SArnd Bergmann 1061b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(__be64), &tmp, padattr); 1062b46f6dedSNicolas Dichtel } 1063b46f6dedSNicolas Dichtel 1064569a8fc3SDavid S. Miller /** 1065e9bbe898SNicolas Dichtel * nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it 10666c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 10676c1dd3b6SDavid S. Miller * @attrtype: attribute type 10686c1dd3b6SDavid S. Miller * @value: numeric value 1069e9bbe898SNicolas Dichtel * @padattr: attribute type for the padding 10706c1dd3b6SDavid S. Miller */ 1071e9bbe898SNicolas Dichtel static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value, 1072e9bbe898SNicolas Dichtel int padattr) 10736c1dd3b6SDavid S. Miller { 1074b4391db4SArnd Bergmann __be64 tmp = value; 1075b4391db4SArnd Bergmann 1076b4391db4SArnd Bergmann return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, tmp, 1077e9bbe898SNicolas Dichtel padattr); 10786c1dd3b6SDavid S. Miller } 10796c1dd3b6SDavid S. Miller 10806c1dd3b6SDavid S. Miller /** 1081e7479122SNicolas Dichtel * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it 108224c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 108324c410dcSDavid S. Miller * @attrtype: attribute type 108424c410dcSDavid S. Miller * @value: numeric value 1085e7479122SNicolas Dichtel * @padattr: attribute type for the padding 108624c410dcSDavid S. Miller */ 1087e7479122SNicolas Dichtel static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value, 1088e7479122SNicolas Dichtel int padattr) 108924c410dcSDavid S. Miller { 1090b4391db4SArnd Bergmann __le64 tmp = value; 1091b4391db4SArnd Bergmann 1092b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(__le64), &tmp, padattr); 109324c410dcSDavid S. Miller } 109424c410dcSDavid S. Miller 109524c410dcSDavid S. Miller /** 10964778e0beSJiri Pirko * nla_put_s8 - Add a s8 netlink attribute to a socket buffer 10974778e0beSJiri Pirko * @skb: socket buffer to add attribute to 10984778e0beSJiri Pirko * @attrtype: attribute type 10994778e0beSJiri Pirko * @value: numeric value 11004778e0beSJiri Pirko */ 11014778e0beSJiri Pirko static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value) 11024778e0beSJiri Pirko { 1103b4391db4SArnd Bergmann s8 tmp = value; 1104b4391db4SArnd Bergmann 1105b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(s8), &tmp); 11064778e0beSJiri Pirko } 11074778e0beSJiri Pirko 11084778e0beSJiri Pirko /** 11094778e0beSJiri Pirko * nla_put_s16 - Add a s16 netlink attribute to a socket buffer 11104778e0beSJiri Pirko * @skb: socket buffer to add attribute to 11114778e0beSJiri Pirko * @attrtype: attribute type 11124778e0beSJiri Pirko * @value: numeric value 11134778e0beSJiri Pirko */ 11144778e0beSJiri Pirko static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value) 11154778e0beSJiri Pirko { 1116b4391db4SArnd Bergmann s16 tmp = value; 1117b4391db4SArnd Bergmann 1118b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(s16), &tmp); 11194778e0beSJiri Pirko } 11204778e0beSJiri Pirko 11214778e0beSJiri Pirko /** 11224778e0beSJiri Pirko * nla_put_s32 - Add a s32 netlink attribute to a socket buffer 11234778e0beSJiri Pirko * @skb: socket buffer to add attribute to 11244778e0beSJiri Pirko * @attrtype: attribute type 11254778e0beSJiri Pirko * @value: numeric value 11264778e0beSJiri Pirko */ 11274778e0beSJiri Pirko static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value) 11284778e0beSJiri Pirko { 1129b4391db4SArnd Bergmann s32 tmp = value; 1130b4391db4SArnd Bergmann 1131b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(s32), &tmp); 11324778e0beSJiri Pirko } 11334778e0beSJiri Pirko 11344778e0beSJiri Pirko /** 1135756a2f59SNicolas Dichtel * nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it 11364778e0beSJiri Pirko * @skb: socket buffer to add attribute to 11374778e0beSJiri Pirko * @attrtype: attribute type 11384778e0beSJiri Pirko * @value: numeric value 1139756a2f59SNicolas Dichtel * @padattr: attribute type for the padding 11404778e0beSJiri Pirko */ 1141756a2f59SNicolas Dichtel static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value, 1142756a2f59SNicolas Dichtel int padattr) 11434778e0beSJiri Pirko { 1144b4391db4SArnd Bergmann s64 tmp = value; 1145b4391db4SArnd Bergmann 1146b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(s64), &tmp, padattr); 11474778e0beSJiri Pirko } 11484778e0beSJiri Pirko 11494778e0beSJiri Pirko /** 1150bfa83a9eSThomas Graf * nla_put_string - Add a string netlink attribute to a socket buffer 1151bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1152bfa83a9eSThomas Graf * @attrtype: attribute type 1153bfa83a9eSThomas Graf * @str: NUL terminated string 1154bfa83a9eSThomas Graf */ 1155bfa83a9eSThomas Graf static inline int nla_put_string(struct sk_buff *skb, int attrtype, 1156bfa83a9eSThomas Graf const char *str) 1157bfa83a9eSThomas Graf { 1158bfa83a9eSThomas Graf return nla_put(skb, attrtype, strlen(str) + 1, str); 1159bfa83a9eSThomas Graf } 1160bfa83a9eSThomas Graf 1161bfa83a9eSThomas Graf /** 1162bfa83a9eSThomas Graf * nla_put_flag - Add a flag netlink attribute to a socket buffer 1163bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1164bfa83a9eSThomas Graf * @attrtype: attribute type 1165bfa83a9eSThomas Graf */ 1166bfa83a9eSThomas Graf static inline int nla_put_flag(struct sk_buff *skb, int attrtype) 1167bfa83a9eSThomas Graf { 1168bfa83a9eSThomas Graf return nla_put(skb, attrtype, 0, NULL); 1169bfa83a9eSThomas Graf } 1170bfa83a9eSThomas Graf 1171bfa83a9eSThomas Graf /** 11722175d87cSNicolas Dichtel * nla_put_msecs - Add a msecs netlink attribute to a skb and align it 1173bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1174bfa83a9eSThomas Graf * @attrtype: attribute type 1175d87de1f3SMark Rustad * @njiffies: number of jiffies to convert to msecs 11762175d87cSNicolas Dichtel * @padattr: attribute type for the padding 1177bfa83a9eSThomas Graf */ 1178bfa83a9eSThomas Graf static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, 11792175d87cSNicolas Dichtel unsigned long njiffies, int padattr) 1180bfa83a9eSThomas Graf { 1181d87de1f3SMark Rustad u64 tmp = jiffies_to_msecs(njiffies); 11822175d87cSNicolas Dichtel 11832175d87cSNicolas Dichtel return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); 1184bfa83a9eSThomas Graf } 1185bfa83a9eSThomas Graf 1186bfa83a9eSThomas Graf /** 1187930345eaSJiri Benc * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket 1188930345eaSJiri Benc * buffer 1189930345eaSJiri Benc * @skb: socket buffer to add attribute to 1190930345eaSJiri Benc * @attrtype: attribute type 1191930345eaSJiri Benc * @addr: IPv4 address 1192930345eaSJiri Benc */ 1193930345eaSJiri Benc static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype, 1194930345eaSJiri Benc __be32 addr) 1195930345eaSJiri Benc { 1196b4391db4SArnd Bergmann __be32 tmp = addr; 1197b4391db4SArnd Bergmann 1198b4391db4SArnd Bergmann return nla_put_be32(skb, attrtype, tmp); 1199930345eaSJiri Benc } 1200930345eaSJiri Benc 1201930345eaSJiri Benc /** 1202930345eaSJiri Benc * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket 1203930345eaSJiri Benc * buffer 1204930345eaSJiri Benc * @skb: socket buffer to add attribute to 1205930345eaSJiri Benc * @attrtype: attribute type 1206930345eaSJiri Benc * @addr: IPv6 address 1207930345eaSJiri Benc */ 1208930345eaSJiri Benc static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype, 1209930345eaSJiri Benc const struct in6_addr *addr) 1210930345eaSJiri Benc { 1211930345eaSJiri Benc return nla_put(skb, attrtype, sizeof(*addr), addr); 1212930345eaSJiri Benc } 1213930345eaSJiri Benc 1214930345eaSJiri Benc /** 1215bfa83a9eSThomas Graf * nla_get_u32 - return payload of u32 attribute 1216bfa83a9eSThomas Graf * @nla: u32 netlink attribute 1217bfa83a9eSThomas Graf */ 1218b057efd4SPatrick McHardy static inline u32 nla_get_u32(const struct nlattr *nla) 1219bfa83a9eSThomas Graf { 1220bfa83a9eSThomas Graf return *(u32 *) nla_data(nla); 1221bfa83a9eSThomas Graf } 1222bfa83a9eSThomas Graf 1223bfa83a9eSThomas Graf /** 122400012e5bSAl Viro * nla_get_be32 - return payload of __be32 attribute 122500012e5bSAl Viro * @nla: __be32 netlink attribute 122600012e5bSAl Viro */ 1227b057efd4SPatrick McHardy static inline __be32 nla_get_be32(const struct nlattr *nla) 122800012e5bSAl Viro { 122900012e5bSAl Viro return *(__be32 *) nla_data(nla); 123000012e5bSAl Viro } 123100012e5bSAl Viro 123200012e5bSAl Viro /** 1233c648a013SAlexander Aring * nla_get_le32 - return payload of __le32 attribute 1234c648a013SAlexander Aring * @nla: __le32 netlink attribute 1235c648a013SAlexander Aring */ 1236c648a013SAlexander Aring static inline __le32 nla_get_le32(const struct nlattr *nla) 1237c648a013SAlexander Aring { 1238c648a013SAlexander Aring return *(__le32 *) nla_data(nla); 1239c648a013SAlexander Aring } 1240c648a013SAlexander Aring 1241c648a013SAlexander Aring /** 1242bfa83a9eSThomas Graf * nla_get_u16 - return payload of u16 attribute 1243bfa83a9eSThomas Graf * @nla: u16 netlink attribute 1244bfa83a9eSThomas Graf */ 1245b057efd4SPatrick McHardy static inline u16 nla_get_u16(const struct nlattr *nla) 1246bfa83a9eSThomas Graf { 1247bfa83a9eSThomas Graf return *(u16 *) nla_data(nla); 1248bfa83a9eSThomas Graf } 1249bfa83a9eSThomas Graf 1250bfa83a9eSThomas Graf /** 1251838965baSPatrick McHardy * nla_get_be16 - return payload of __be16 attribute 1252838965baSPatrick McHardy * @nla: __be16 netlink attribute 1253838965baSPatrick McHardy */ 1254b057efd4SPatrick McHardy static inline __be16 nla_get_be16(const struct nlattr *nla) 1255838965baSPatrick McHardy { 1256838965baSPatrick McHardy return *(__be16 *) nla_data(nla); 1257838965baSPatrick McHardy } 1258838965baSPatrick McHardy 1259838965baSPatrick McHardy /** 12604a89c256SThomas Graf * nla_get_le16 - return payload of __le16 attribute 12614a89c256SThomas Graf * @nla: __le16 netlink attribute 12624a89c256SThomas Graf */ 1263b057efd4SPatrick McHardy static inline __le16 nla_get_le16(const struct nlattr *nla) 12644a89c256SThomas Graf { 12654a89c256SThomas Graf return *(__le16 *) nla_data(nla); 12664a89c256SThomas Graf } 12674a89c256SThomas Graf 12684a89c256SThomas Graf /** 1269bfa83a9eSThomas Graf * nla_get_u8 - return payload of u8 attribute 1270bfa83a9eSThomas Graf * @nla: u8 netlink attribute 1271bfa83a9eSThomas Graf */ 1272b057efd4SPatrick McHardy static inline u8 nla_get_u8(const struct nlattr *nla) 1273bfa83a9eSThomas Graf { 1274bfa83a9eSThomas Graf return *(u8 *) nla_data(nla); 1275bfa83a9eSThomas Graf } 1276bfa83a9eSThomas Graf 1277bfa83a9eSThomas Graf /** 1278bfa83a9eSThomas Graf * nla_get_u64 - return payload of u64 attribute 1279bfa83a9eSThomas Graf * @nla: u64 netlink attribute 1280bfa83a9eSThomas Graf */ 1281b057efd4SPatrick McHardy static inline u64 nla_get_u64(const struct nlattr *nla) 1282bfa83a9eSThomas Graf { 1283bfa83a9eSThomas Graf u64 tmp; 1284bfa83a9eSThomas Graf 1285bfa83a9eSThomas Graf nla_memcpy(&tmp, nla, sizeof(tmp)); 1286bfa83a9eSThomas Graf 1287bfa83a9eSThomas Graf return tmp; 1288bfa83a9eSThomas Graf } 1289bfa83a9eSThomas Graf 1290bfa83a9eSThomas Graf /** 1291a17c8598SPablo Neira Ayuso * nla_get_be64 - return payload of __be64 attribute 1292a17c8598SPablo Neira Ayuso * @nla: __be64 netlink attribute 1293a17c8598SPablo Neira Ayuso */ 1294a17c8598SPablo Neira Ayuso static inline __be64 nla_get_be64(const struct nlattr *nla) 1295a17c8598SPablo Neira Ayuso { 1296f5d410f2SPablo Neira Ayuso __be64 tmp; 1297f5d410f2SPablo Neira Ayuso 1298f5d410f2SPablo Neira Ayuso nla_memcpy(&tmp, nla, sizeof(tmp)); 1299f5d410f2SPablo Neira Ayuso 1300f5d410f2SPablo Neira Ayuso return tmp; 1301a17c8598SPablo Neira Ayuso } 1302a17c8598SPablo Neira Ayuso 1303a17c8598SPablo Neira Ayuso /** 1304c648a013SAlexander Aring * nla_get_le64 - return payload of __le64 attribute 1305c648a013SAlexander Aring * @nla: __le64 netlink attribute 1306c648a013SAlexander Aring */ 1307c648a013SAlexander Aring static inline __le64 nla_get_le64(const struct nlattr *nla) 1308c648a013SAlexander Aring { 1309c648a013SAlexander Aring return *(__le64 *) nla_data(nla); 1310c648a013SAlexander Aring } 1311c648a013SAlexander Aring 1312c648a013SAlexander Aring /** 13134778e0beSJiri Pirko * nla_get_s32 - return payload of s32 attribute 13144778e0beSJiri Pirko * @nla: s32 netlink attribute 13154778e0beSJiri Pirko */ 13164778e0beSJiri Pirko static inline s32 nla_get_s32(const struct nlattr *nla) 13174778e0beSJiri Pirko { 13184778e0beSJiri Pirko return *(s32 *) nla_data(nla); 13194778e0beSJiri Pirko } 13204778e0beSJiri Pirko 13214778e0beSJiri Pirko /** 13224778e0beSJiri Pirko * nla_get_s16 - return payload of s16 attribute 13234778e0beSJiri Pirko * @nla: s16 netlink attribute 13244778e0beSJiri Pirko */ 13254778e0beSJiri Pirko static inline s16 nla_get_s16(const struct nlattr *nla) 13264778e0beSJiri Pirko { 13274778e0beSJiri Pirko return *(s16 *) nla_data(nla); 13284778e0beSJiri Pirko } 13294778e0beSJiri Pirko 13304778e0beSJiri Pirko /** 13314778e0beSJiri Pirko * nla_get_s8 - return payload of s8 attribute 13324778e0beSJiri Pirko * @nla: s8 netlink attribute 13334778e0beSJiri Pirko */ 13344778e0beSJiri Pirko static inline s8 nla_get_s8(const struct nlattr *nla) 13354778e0beSJiri Pirko { 13364778e0beSJiri Pirko return *(s8 *) nla_data(nla); 13374778e0beSJiri Pirko } 13384778e0beSJiri Pirko 13394778e0beSJiri Pirko /** 13404778e0beSJiri Pirko * nla_get_s64 - return payload of s64 attribute 13414778e0beSJiri Pirko * @nla: s64 netlink attribute 13424778e0beSJiri Pirko */ 13434778e0beSJiri Pirko static inline s64 nla_get_s64(const struct nlattr *nla) 13444778e0beSJiri Pirko { 13454778e0beSJiri Pirko s64 tmp; 13464778e0beSJiri Pirko 13474778e0beSJiri Pirko nla_memcpy(&tmp, nla, sizeof(tmp)); 13484778e0beSJiri Pirko 13494778e0beSJiri Pirko return tmp; 13504778e0beSJiri Pirko } 13514778e0beSJiri Pirko 13524778e0beSJiri Pirko /** 1353bfa83a9eSThomas Graf * nla_get_flag - return payload of flag attribute 1354bfa83a9eSThomas Graf * @nla: flag netlink attribute 1355bfa83a9eSThomas Graf */ 1356b057efd4SPatrick McHardy static inline int nla_get_flag(const struct nlattr *nla) 1357bfa83a9eSThomas Graf { 1358bfa83a9eSThomas Graf return !!nla; 1359bfa83a9eSThomas Graf } 1360bfa83a9eSThomas Graf 1361bfa83a9eSThomas Graf /** 1362bfa83a9eSThomas Graf * nla_get_msecs - return payload of msecs attribute 1363bfa83a9eSThomas Graf * @nla: msecs netlink attribute 1364bfa83a9eSThomas Graf * 1365bfa83a9eSThomas Graf * Returns the number of milliseconds in jiffies. 1366bfa83a9eSThomas Graf */ 1367b057efd4SPatrick McHardy static inline unsigned long nla_get_msecs(const struct nlattr *nla) 1368bfa83a9eSThomas Graf { 1369bfa83a9eSThomas Graf u64 msecs = nla_get_u64(nla); 1370bfa83a9eSThomas Graf 1371bfa83a9eSThomas Graf return msecs_to_jiffies((unsigned long) msecs); 1372bfa83a9eSThomas Graf } 1373bfa83a9eSThomas Graf 1374bfa83a9eSThomas Graf /** 137567b61f6cSJiri Benc * nla_get_in_addr - return payload of IPv4 address attribute 137667b61f6cSJiri Benc * @nla: IPv4 address netlink attribute 137767b61f6cSJiri Benc */ 137867b61f6cSJiri Benc static inline __be32 nla_get_in_addr(const struct nlattr *nla) 137967b61f6cSJiri Benc { 138067b61f6cSJiri Benc return *(__be32 *) nla_data(nla); 138167b61f6cSJiri Benc } 138267b61f6cSJiri Benc 138367b61f6cSJiri Benc /** 138467b61f6cSJiri Benc * nla_get_in6_addr - return payload of IPv6 address attribute 138567b61f6cSJiri Benc * @nla: IPv6 address netlink attribute 138667b61f6cSJiri Benc */ 138767b61f6cSJiri Benc static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla) 138867b61f6cSJiri Benc { 138967b61f6cSJiri Benc struct in6_addr tmp; 139067b61f6cSJiri Benc 139167b61f6cSJiri Benc nla_memcpy(&tmp, nla, sizeof(tmp)); 139267b61f6cSJiri Benc return tmp; 139367b61f6cSJiri Benc } 139467b61f6cSJiri Benc 139567b61f6cSJiri Benc /** 139664c83d83SJamal Hadi Salim * nla_get_bitfield32 - return payload of 32 bitfield attribute 139764c83d83SJamal Hadi Salim * @nla: nla_bitfield32 attribute 139864c83d83SJamal Hadi Salim */ 139964c83d83SJamal Hadi Salim static inline struct nla_bitfield32 nla_get_bitfield32(const struct nlattr *nla) 140064c83d83SJamal Hadi Salim { 140164c83d83SJamal Hadi Salim struct nla_bitfield32 tmp; 140264c83d83SJamal Hadi Salim 140364c83d83SJamal Hadi Salim nla_memcpy(&tmp, nla, sizeof(tmp)); 140464c83d83SJamal Hadi Salim return tmp; 140564c83d83SJamal Hadi Salim } 140664c83d83SJamal Hadi Salim 140764c83d83SJamal Hadi Salim /** 1408b15ca182SThomas Graf * nla_memdup - duplicate attribute memory (kmemdup) 1409b15ca182SThomas Graf * @src: netlink attribute to duplicate from 1410b15ca182SThomas Graf * @gfp: GFP mask 1411b15ca182SThomas Graf */ 1412b15ca182SThomas Graf static inline void *nla_memdup(const struct nlattr *src, gfp_t gfp) 1413b15ca182SThomas Graf { 1414b15ca182SThomas Graf return kmemdup(nla_data(src), nla_len(src), gfp); 1415b15ca182SThomas Graf } 1416b15ca182SThomas Graf 1417b15ca182SThomas Graf /** 1418ae0be8deSMichal Kubecek * nla_nest_start_noflag - Start a new level of nested attributes 1419bfa83a9eSThomas Graf * @skb: socket buffer to add attributes to 1420bfa83a9eSThomas Graf * @attrtype: attribute type of container 1421bfa83a9eSThomas Graf * 1422ae0be8deSMichal Kubecek * This function exists for backward compatibility to use in APIs which never 1423ae0be8deSMichal Kubecek * marked their nest attributes with NLA_F_NESTED flag. New APIs should use 1424ae0be8deSMichal Kubecek * nla_nest_start() which sets the flag. 1425ae0be8deSMichal Kubecek * 1426ae0be8deSMichal Kubecek * Returns the container attribute or NULL on error 1427bfa83a9eSThomas Graf */ 1428ae0be8deSMichal Kubecek static inline struct nlattr *nla_nest_start_noflag(struct sk_buff *skb, 1429ae0be8deSMichal Kubecek int attrtype) 1430bfa83a9eSThomas Graf { 143127a884dcSArnaldo Carvalho de Melo struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); 1432bfa83a9eSThomas Graf 1433bfa83a9eSThomas Graf if (nla_put(skb, attrtype, 0, NULL) < 0) 1434bfa83a9eSThomas Graf return NULL; 1435bfa83a9eSThomas Graf 1436bfa83a9eSThomas Graf return start; 1437bfa83a9eSThomas Graf } 1438bfa83a9eSThomas Graf 1439bfa83a9eSThomas Graf /** 1440ae0be8deSMichal Kubecek * nla_nest_start - Start a new level of nested attributes, with NLA_F_NESTED 1441ae0be8deSMichal Kubecek * @skb: socket buffer to add attributes to 1442ae0be8deSMichal Kubecek * @attrtype: attribute type of container 1443ae0be8deSMichal Kubecek * 1444ae0be8deSMichal Kubecek * Unlike nla_nest_start_noflag(), mark the nest attribute with NLA_F_NESTED 1445ae0be8deSMichal Kubecek * flag. This is the preferred function to use in new code. 1446ae0be8deSMichal Kubecek * 1447ae0be8deSMichal Kubecek * Returns the container attribute or NULL on error 1448ae0be8deSMichal Kubecek */ 1449ae0be8deSMichal Kubecek static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) 1450ae0be8deSMichal Kubecek { 1451ae0be8deSMichal Kubecek return nla_nest_start_noflag(skb, attrtype | NLA_F_NESTED); 1452ae0be8deSMichal Kubecek } 1453ae0be8deSMichal Kubecek 1454ae0be8deSMichal Kubecek /** 1455bfa83a9eSThomas Graf * nla_nest_end - Finalize nesting of attributes 1456d1ec3b77SPierre Ynard * @skb: socket buffer the attributes are stored in 1457bfa83a9eSThomas Graf * @start: container attribute 1458bfa83a9eSThomas Graf * 1459bfa83a9eSThomas Graf * Corrects the container attribute header to include the all 1460bfa83a9eSThomas Graf * appeneded attributes. 1461bfa83a9eSThomas Graf * 1462bfa83a9eSThomas Graf * Returns the total data length of the skb. 1463bfa83a9eSThomas Graf */ 1464bfa83a9eSThomas Graf static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) 1465bfa83a9eSThomas Graf { 146627a884dcSArnaldo Carvalho de Melo start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; 1467bfa83a9eSThomas Graf return skb->len; 1468bfa83a9eSThomas Graf } 1469bfa83a9eSThomas Graf 1470bfa83a9eSThomas Graf /** 1471bfa83a9eSThomas Graf * nla_nest_cancel - Cancel nesting of attributes 1472bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 1473bfa83a9eSThomas Graf * @start: container attribute 1474bfa83a9eSThomas Graf * 1475bfa83a9eSThomas Graf * Removes the container attribute and including all nested 1476bc3ed28cSThomas Graf * attributes. Returns -EMSGSIZE 1477bfa83a9eSThomas Graf */ 1478bc3ed28cSThomas Graf static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) 1479bfa83a9eSThomas Graf { 1480bc3ed28cSThomas Graf nlmsg_trim(skb, start); 1481bfa83a9eSThomas Graf } 1482bfa83a9eSThomas Graf 1483bfa83a9eSThomas Graf /** 14844fe5d5c0SPaul Moore * nla_validate_nested - Validate a stream of nested attributes 14854fe5d5c0SPaul Moore * @start: container attribute 14864fe5d5c0SPaul Moore * @maxtype: maximum attribute type to be expected 14874fe5d5c0SPaul Moore * @policy: validation policy 1488fceb6435SJohannes Berg * @extack: extended ACK report struct 14894fe5d5c0SPaul Moore * 14904fe5d5c0SPaul Moore * Validates all attributes in the nested attribute stream against the 14914fe5d5c0SPaul Moore * specified policy. Attributes with a type exceeding maxtype will be 14924fe5d5c0SPaul Moore * ignored. See documenation of struct nla_policy for more details. 14934fe5d5c0SPaul Moore * 14944fe5d5c0SPaul Moore * Returns 0 on success or a negative error code. 14954fe5d5c0SPaul Moore */ 14963654654fSJan Engelhardt static inline int nla_validate_nested(const struct nlattr *start, int maxtype, 1497fceb6435SJohannes Berg const struct nla_policy *policy, 1498fceb6435SJohannes Berg struct netlink_ext_ack *extack) 14994fe5d5c0SPaul Moore { 1500fceb6435SJohannes Berg return nla_validate(nla_data(start), nla_len(start), maxtype, policy, 1501fceb6435SJohannes Berg extack); 15024fe5d5c0SPaul Moore } 15034fe5d5c0SPaul Moore 15044fe5d5c0SPaul Moore /** 1505089bf1a6SNicolas Dichtel * nla_need_padding_for_64bit - test 64-bit alignment of the next attribute 1506089bf1a6SNicolas Dichtel * @skb: socket buffer the message is stored in 1507089bf1a6SNicolas Dichtel * 1508089bf1a6SNicolas Dichtel * Return true if padding is needed to align the next attribute (nla_data()) to 1509089bf1a6SNicolas Dichtel * a 64-bit aligned area. 1510089bf1a6SNicolas Dichtel */ 1511089bf1a6SNicolas Dichtel static inline bool nla_need_padding_for_64bit(struct sk_buff *skb) 1512089bf1a6SNicolas Dichtel { 1513089bf1a6SNicolas Dichtel #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 1514089bf1a6SNicolas Dichtel /* The nlattr header is 4 bytes in size, that's why we test 1515089bf1a6SNicolas Dichtel * if the skb->data _is_ aligned. A NOP attribute, plus 1516089bf1a6SNicolas Dichtel * nlattr header for next attribute, will make nla_data() 1517089bf1a6SNicolas Dichtel * 8-byte aligned. 1518089bf1a6SNicolas Dichtel */ 1519089bf1a6SNicolas Dichtel if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8)) 1520089bf1a6SNicolas Dichtel return true; 1521089bf1a6SNicolas Dichtel #endif 1522089bf1a6SNicolas Dichtel return false; 1523089bf1a6SNicolas Dichtel } 1524089bf1a6SNicolas Dichtel 1525089bf1a6SNicolas Dichtel /** 152635c58459SDavid S. Miller * nla_align_64bit - 64-bit align the nla_data() of next attribute 152735c58459SDavid S. Miller * @skb: socket buffer the message is stored in 152835c58459SDavid S. Miller * @padattr: attribute type for the padding 152935c58459SDavid S. Miller * 153035c58459SDavid S. Miller * Conditionally emit a padding netlink attribute in order to make 153135c58459SDavid S. Miller * the next attribute we emit have a 64-bit aligned nla_data() area. 153235c58459SDavid S. Miller * This will only be done in architectures which do not have 1533cca1d815SEric Dumazet * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined. 153435c58459SDavid S. Miller * 153535c58459SDavid S. Miller * Returns zero on success or a negative error code. 153635c58459SDavid S. Miller */ 153735c58459SDavid S. Miller static inline int nla_align_64bit(struct sk_buff *skb, int padattr) 153835c58459SDavid S. Miller { 1539089bf1a6SNicolas Dichtel if (nla_need_padding_for_64bit(skb) && 1540cca1d815SEric Dumazet !nla_reserve(skb, padattr, 0)) 154135c58459SDavid S. Miller return -EMSGSIZE; 1542089bf1a6SNicolas Dichtel 154335c58459SDavid S. Miller return 0; 154435c58459SDavid S. Miller } 154535c58459SDavid S. Miller 154635c58459SDavid S. Miller /** 154735c58459SDavid S. Miller * nla_total_size_64bit - total length of attribute including padding 154835c58459SDavid S. Miller * @payload: length of payload 154935c58459SDavid S. Miller */ 155035c58459SDavid S. Miller static inline int nla_total_size_64bit(int payload) 155135c58459SDavid S. Miller { 155235c58459SDavid S. Miller return NLA_ALIGN(nla_attr_size(payload)) 1553cca1d815SEric Dumazet #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 155435c58459SDavid S. Miller + NLA_ALIGN(nla_attr_size(0)) 155535c58459SDavid S. Miller #endif 155635c58459SDavid S. Miller ; 155735c58459SDavid S. Miller } 155835c58459SDavid S. Miller 155935c58459SDavid S. Miller /** 1560bfa83a9eSThomas Graf * nla_for_each_attr - iterate over a stream of attributes 1561bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 1562bfa83a9eSThomas Graf * @head: head of attribute stream 1563bfa83a9eSThomas Graf * @len: length of attribute stream 1564bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 1565bfa83a9eSThomas Graf */ 1566bfa83a9eSThomas Graf #define nla_for_each_attr(pos, head, len, rem) \ 1567bfa83a9eSThomas Graf for (pos = head, rem = len; \ 1568bfa83a9eSThomas Graf nla_ok(pos, rem); \ 1569bfa83a9eSThomas Graf pos = nla_next(pos, &(rem))) 1570bfa83a9eSThomas Graf 1571fe4944e5SThomas Graf /** 1572fe4944e5SThomas Graf * nla_for_each_nested - iterate over nested attributes 1573fe4944e5SThomas Graf * @pos: loop counter, set to current attribute 1574fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 1575fe4944e5SThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 1576fe4944e5SThomas Graf */ 1577fe4944e5SThomas Graf #define nla_for_each_nested(pos, nla, rem) \ 1578fe4944e5SThomas Graf nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) 1579fe4944e5SThomas Graf 1580941d8ebcSSimon Horman /** 1581941d8ebcSSimon Horman * nla_is_last - Test if attribute is last in stream 1582941d8ebcSSimon Horman * @nla: attribute to test 1583941d8ebcSSimon Horman * @rem: bytes remaining in stream 1584941d8ebcSSimon Horman */ 1585941d8ebcSSimon Horman static inline bool nla_is_last(const struct nlattr *nla, int rem) 1586941d8ebcSSimon Horman { 1587941d8ebcSSimon Horman return nla->nla_len == rem; 1588941d8ebcSSimon Horman } 1589941d8ebcSSimon Horman 1590bfa83a9eSThomas Graf #endif 1591