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, 1866f455f5fSJohannes Berg NLA_MIN_LEN, 187bfa83a9eSThomas Graf __NLA_TYPE_MAX, 188bfa83a9eSThomas Graf }; 189bfa83a9eSThomas Graf 190bfa83a9eSThomas Graf #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) 191bfa83a9eSThomas Graf 1923e48be05SJohannes Berg enum nla_policy_validation { 1933e48be05SJohannes Berg NLA_VALIDATE_NONE, 1943e48be05SJohannes Berg NLA_VALIDATE_RANGE, 1953e48be05SJohannes Berg NLA_VALIDATE_MIN, 1963e48be05SJohannes Berg NLA_VALIDATE_MAX, 19733188bd6SJohannes Berg NLA_VALIDATE_FUNCTION, 1983e48be05SJohannes Berg }; 1993e48be05SJohannes Berg 200bfa83a9eSThomas Graf /** 201bfa83a9eSThomas Graf * struct nla_policy - attribute validation policy 202bfa83a9eSThomas Graf * @type: Type of attribute or NLA_UNSPEC 2033e48be05SJohannes Berg * @validation_type: type of attribute validation done in addition to 20433188bd6SJohannes Berg * type-specific validation (e.g. range, function call), see 2053e48be05SJohannes Berg * &enum nla_policy_validation 206a5531a5dSThomas Graf * @len: Type specific length of payload 207bfa83a9eSThomas Graf * 208bfa83a9eSThomas Graf * Policies are defined as arrays of this struct, the array must be 209bfa83a9eSThomas Graf * accessible by attribute type up to the highest identifier to be expected. 210bfa83a9eSThomas Graf * 211a5531a5dSThomas Graf * Meaning of `len' field: 212a5531a5dSThomas Graf * NLA_STRING Maximum length of string 213a5531a5dSThomas Graf * NLA_NUL_STRING Maximum length of string (excluding NUL) 214a5531a5dSThomas Graf * NLA_FLAG Unused 215d30045a0SJohannes Berg * NLA_BINARY Maximum length of attribute payload 2166f455f5fSJohannes Berg * NLA_MIN_LEN Minimum length of attribute payload 2171501d135SJohannes Berg * NLA_NESTED, 2181501d135SJohannes Berg * NLA_NESTED_ARRAY Length verification is done by checking len of 2199a659a35SJohannes Berg * nested header (or empty); len field is used if 2209a659a35SJohannes Berg * validation_data is also used, for the max attr 2219a659a35SJohannes Berg * number in the nested policy. 2224b6cc728SJohannes Berg * NLA_U8, NLA_U16, 2234b6cc728SJohannes Berg * NLA_U32, NLA_U64, 2244778e0beSJiri Pirko * NLA_S8, NLA_S16, 2254778e0beSJiri Pirko * NLA_S32, NLA_S64, 2264b6cc728SJohannes Berg * NLA_MSECS Leaving the length field zero will verify the 2274b6cc728SJohannes Berg * given type fits, using it verifies minimum length 2284b6cc728SJohannes Berg * just like "All other" 229568b742aSJohannes Berg * NLA_BITFIELD32 Unused 230568b742aSJohannes Berg * NLA_REJECT Unused 231b60b87fcSJohannes Berg * NLA_EXACT_LEN Attribute must have exactly this length, otherwise 232b60b87fcSJohannes Berg * it is rejected. 233b60b87fcSJohannes Berg * NLA_EXACT_LEN_WARN Attribute should have exactly this length, a warning 234b60b87fcSJohannes Berg * is logged if it is longer, shorter is rejected. 2356f455f5fSJohannes Berg * NLA_MIN_LEN Minimum length of attribute payload 2364b6cc728SJohannes Berg * All other Minimum length of attribute payload 237a5531a5dSThomas Graf * 238568b742aSJohannes Berg * Meaning of `validation_data' field: 239568b742aSJohannes Berg * NLA_BITFIELD32 This is a 32-bit bitmap/bitselector attribute and 240568b742aSJohannes Berg * validation data must point to a u32 value of valid 241568b742aSJohannes Berg * flags 242568b742aSJohannes Berg * NLA_REJECT This attribute is always rejected and validation data 243568b742aSJohannes Berg * may point to a string to report as the error instead 244568b742aSJohannes Berg * of the generic one in extended ACK. 2459a659a35SJohannes Berg * NLA_NESTED Points to a nested policy to validate, must also set 2469a659a35SJohannes Berg * `len' to the max attribute number. 2479a659a35SJohannes Berg * Note that nla_parse() will validate, but of course not 2489a659a35SJohannes Berg * parse, the nested sub-policies. 2491501d135SJohannes Berg * NLA_NESTED_ARRAY Points to a nested policy to validate, must also set 2501501d135SJohannes Berg * `len' to the max attribute number. The difference to 2511501d135SJohannes Berg * NLA_NESTED is the structure - NLA_NESTED has the 2521501d135SJohannes Berg * nested attributes directly inside, while an array has 2531501d135SJohannes Berg * the nested attributes at another level down and the 2541501d135SJohannes Berg * attributes directly in the nesting don't matter. 2553e48be05SJohannes Berg * All other Unused - but note that it's a union 2563e48be05SJohannes Berg * 2573e48be05SJohannes Berg * Meaning of `min' and `max' fields, use via NLA_POLICY_MIN, NLA_POLICY_MAX 2583e48be05SJohannes Berg * and NLA_POLICY_RANGE: 2593e48be05SJohannes Berg * NLA_U8, 2603e48be05SJohannes Berg * NLA_U16, 2613e48be05SJohannes Berg * NLA_U32, 2623e48be05SJohannes Berg * NLA_U64, 2633e48be05SJohannes Berg * NLA_S8, 2643e48be05SJohannes Berg * NLA_S16, 2653e48be05SJohannes Berg * NLA_S32, 2663e48be05SJohannes Berg * NLA_S64 These are used depending on the validation_type 2673e48be05SJohannes Berg * field, if that is min/max/range then the minimum, 2683e48be05SJohannes Berg * maximum and both are used (respectively) to check 2693e48be05SJohannes Berg * the value of the integer attribute. 2703e48be05SJohannes Berg * Note that in the interest of code simplicity and 2713e48be05SJohannes Berg * struct size both limits are s16, so you cannot 2723e48be05SJohannes Berg * enforce a range that doesn't fall within the range 2733e48be05SJohannes Berg * of s16 - do that as usual in the code instead. 2743e48be05SJohannes Berg * All other Unused - but note that it's a union 275568b742aSJohannes Berg * 27633188bd6SJohannes Berg * Meaning of `validate' field, use via NLA_POLICY_VALIDATE_FN: 27733188bd6SJohannes Berg * NLA_BINARY Validation function called for the attribute, 27833188bd6SJohannes Berg * not compatible with use of the validation_data 27933188bd6SJohannes Berg * as in NLA_BITFIELD32, NLA_REJECT, NLA_NESTED and 28033188bd6SJohannes Berg * NLA_NESTED_ARRAY. 28133188bd6SJohannes Berg * All other Unused - but note that it's a union 28233188bd6SJohannes Berg * 283bfa83a9eSThomas Graf * Example: 284b54452b0SAlexey Dobriyan * static const struct nla_policy my_policy[ATTR_MAX+1] = { 285bfa83a9eSThomas Graf * [ATTR_FOO] = { .type = NLA_U16 }, 286d30045a0SJohannes Berg * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ }, 2876f455f5fSJohannes Berg * [ATTR_BAZ] = { .type = NLA_EXACT_LEN, .len = sizeof(struct mystruct) }, 28864c83d83SJamal Hadi Salim * [ATTR_GOO] = { .type = NLA_BITFIELD32, .validation_data = &myvalidflags }, 289bfa83a9eSThomas Graf * }; 290bfa83a9eSThomas Graf */ 291bfa83a9eSThomas Graf struct nla_policy { 2923e48be05SJohannes Berg u8 type; 2933e48be05SJohannes Berg u8 validation_type; 294a5531a5dSThomas Graf u16 len; 2953e48be05SJohannes Berg union { 29648fde90aSJohannes Berg const void *validation_data; 2973e48be05SJohannes Berg struct { 2983e48be05SJohannes Berg s16 min, max; 2993e48be05SJohannes Berg }; 30033188bd6SJohannes Berg int (*validate)(const struct nlattr *attr, 30133188bd6SJohannes Berg struct netlink_ext_ack *extack); 30256738f46SJohannes Berg /* This entry is special, and used for the attribute at index 0 30356738f46SJohannes Berg * only, and specifies special data about the policy, namely it 30456738f46SJohannes Berg * specifies the "boundary type" where strict length validation 30556738f46SJohannes Berg * starts for any attribute types >= this value, also, strict 30656738f46SJohannes Berg * nesting validation starts here. 30756738f46SJohannes Berg * 30856738f46SJohannes Berg * Additionally, it means that NLA_UNSPEC is actually NLA_REJECT 30956738f46SJohannes Berg * for any types >= this, so need to use NLA_MIN_LEN to get the 31056738f46SJohannes Berg * previous pure { .len = xyz } behaviour. The advantage of this 31156738f46SJohannes Berg * is that types not specified in the policy will be rejected. 31256738f46SJohannes Berg * 31356738f46SJohannes Berg * For completely new families it should be set to 1 so that the 31456738f46SJohannes Berg * validation is enforced for all attributes. For existing ones 31556738f46SJohannes Berg * it should be set at least when new attributes are added to 31656738f46SJohannes Berg * the enum used by the policy, and be set to the new value that 31756738f46SJohannes Berg * was added to enforce strict validation from thereon. 31856738f46SJohannes Berg */ 31956738f46SJohannes Berg u16 strict_start_type; 3203e48be05SJohannes Berg }; 321bfa83a9eSThomas Graf }; 322bfa83a9eSThomas Graf 323b60b87fcSJohannes Berg #define NLA_POLICY_EXACT_LEN(_len) { .type = NLA_EXACT_LEN, .len = _len } 324b60b87fcSJohannes Berg #define NLA_POLICY_EXACT_LEN_WARN(_len) { .type = NLA_EXACT_LEN_WARN, \ 325b60b87fcSJohannes Berg .len = _len } 3266f455f5fSJohannes Berg #define NLA_POLICY_MIN_LEN(_len) { .type = NLA_MIN_LEN, .len = _len } 327b60b87fcSJohannes Berg 328b60b87fcSJohannes Berg #define NLA_POLICY_ETH_ADDR NLA_POLICY_EXACT_LEN(ETH_ALEN) 329b60b87fcSJohannes Berg #define NLA_POLICY_ETH_ADDR_COMPAT NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN) 330b60b87fcSJohannes Berg 33123323289SJohannes Berg #define _NLA_POLICY_NESTED(maxattr, policy) \ 3329a659a35SJohannes Berg { .type = NLA_NESTED, .validation_data = policy, .len = maxattr } 33323323289SJohannes Berg #define _NLA_POLICY_NESTED_ARRAY(maxattr, policy) \ 3341501d135SJohannes Berg { .type = NLA_NESTED_ARRAY, .validation_data = policy, .len = maxattr } 33523323289SJohannes Berg #define NLA_POLICY_NESTED(policy) \ 33623323289SJohannes Berg _NLA_POLICY_NESTED(ARRAY_SIZE(policy) - 1, policy) 33723323289SJohannes Berg #define NLA_POLICY_NESTED_ARRAY(policy) \ 33823323289SJohannes Berg _NLA_POLICY_NESTED_ARRAY(ARRAY_SIZE(policy) - 1, policy) 3399a659a35SJohannes Berg 3405886d932SJohannes Berg #define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition)) 3413e48be05SJohannes Berg #define NLA_ENSURE_INT_TYPE(tp) \ 3423e48be05SJohannes Berg (__NLA_ENSURE(tp == NLA_S8 || tp == NLA_U8 || \ 3433e48be05SJohannes Berg tp == NLA_S16 || tp == NLA_U16 || \ 3443e48be05SJohannes Berg tp == NLA_S32 || tp == NLA_U32 || \ 3453e48be05SJohannes Berg tp == NLA_S64 || tp == NLA_U64) + tp) 34633188bd6SJohannes Berg #define NLA_ENSURE_NO_VALIDATION_PTR(tp) \ 34733188bd6SJohannes Berg (__NLA_ENSURE(tp != NLA_BITFIELD32 && \ 34833188bd6SJohannes Berg tp != NLA_REJECT && \ 34933188bd6SJohannes Berg tp != NLA_NESTED && \ 35033188bd6SJohannes Berg tp != NLA_NESTED_ARRAY) + tp) 3513e48be05SJohannes Berg 3523e48be05SJohannes Berg #define NLA_POLICY_RANGE(tp, _min, _max) { \ 3533e48be05SJohannes Berg .type = NLA_ENSURE_INT_TYPE(tp), \ 3543e48be05SJohannes Berg .validation_type = NLA_VALIDATE_RANGE, \ 3553e48be05SJohannes Berg .min = _min, \ 3563e48be05SJohannes Berg .max = _max \ 3573e48be05SJohannes Berg } 3583e48be05SJohannes Berg 3593e48be05SJohannes Berg #define NLA_POLICY_MIN(tp, _min) { \ 3603e48be05SJohannes Berg .type = NLA_ENSURE_INT_TYPE(tp), \ 3613e48be05SJohannes Berg .validation_type = NLA_VALIDATE_MIN, \ 3623e48be05SJohannes Berg .min = _min, \ 3633e48be05SJohannes Berg } 3643e48be05SJohannes Berg 3653e48be05SJohannes Berg #define NLA_POLICY_MAX(tp, _max) { \ 3663e48be05SJohannes Berg .type = NLA_ENSURE_INT_TYPE(tp), \ 3673e48be05SJohannes Berg .validation_type = NLA_VALIDATE_MAX, \ 3683e48be05SJohannes Berg .max = _max, \ 3693e48be05SJohannes Berg } 3703e48be05SJohannes Berg 37133188bd6SJohannes Berg #define NLA_POLICY_VALIDATE_FN(tp, fn, ...) { \ 37233188bd6SJohannes Berg .type = NLA_ENSURE_NO_VALIDATION_PTR(tp), \ 37333188bd6SJohannes Berg .validation_type = NLA_VALIDATE_FUNCTION, \ 37433188bd6SJohannes Berg .validate = fn, \ 37533188bd6SJohannes Berg .len = __VA_ARGS__ + 0, \ 37633188bd6SJohannes Berg } 37733188bd6SJohannes Berg 3784e902c57SThomas Graf /** 3794e902c57SThomas Graf * struct nl_info - netlink source information 3804e902c57SThomas Graf * @nlh: Netlink message header of original request 3813de205cdSIdo Schimmel * @nl_net: Network namespace 38215e47304SEric W. Biederman * @portid: Netlink PORTID of requesting application 3833de205cdSIdo Schimmel * @skip_notify: Skip netlink notifications to user space 384c82481f7SIdo Schimmel * @skip_notify_kernel: Skip selected in-kernel notifications 3854e902c57SThomas Graf */ 3864e902c57SThomas Graf struct nl_info { 3874e902c57SThomas Graf struct nlmsghdr *nlh; 3884d1169c1SDenis V. Lunev struct net *nl_net; 38915e47304SEric W. Biederman u32 portid; 390c82481f7SIdo Schimmel u8 skip_notify:1, 391c82481f7SIdo Schimmel skip_notify_kernel:1; 3924e902c57SThomas Graf }; 3934e902c57SThomas Graf 3948cb08174SJohannes Berg /** 3958cb08174SJohannes Berg * enum netlink_validation - netlink message/attribute validation levels 3968cb08174SJohannes Berg * @NL_VALIDATE_LIBERAL: Old-style "be liberal" validation, not caring about 3978cb08174SJohannes Berg * extra data at the end of the message, attributes being longer than 3988cb08174SJohannes Berg * they should be, or unknown attributes being present. 3998cb08174SJohannes Berg * @NL_VALIDATE_TRAILING: Reject junk data encountered after attribute parsing. 4008cb08174SJohannes Berg * @NL_VALIDATE_MAXTYPE: Reject attributes > max type; Together with _TRAILING 4018cb08174SJohannes Berg * this is equivalent to the old nla_parse_strict()/nlmsg_parse_strict(). 4028cb08174SJohannes Berg * @NL_VALIDATE_UNSPEC: Reject attributes with NLA_UNSPEC in the policy. 4038cb08174SJohannes Berg * This can safely be set by the kernel when the given policy has no 4048cb08174SJohannes Berg * NLA_UNSPEC anymore, and can thus be used to ensure policy entries 4058cb08174SJohannes Berg * are enforced going forward. 4068cb08174SJohannes Berg * @NL_VALIDATE_STRICT_ATTRS: strict attribute policy parsing (e.g. 4078cb08174SJohannes Berg * U8, U16, U32 must have exact size, etc.) 408b424e432SMichal Kubecek * @NL_VALIDATE_NESTED: Check that NLA_F_NESTED is set for NLA_NESTED(_ARRAY) 409b424e432SMichal Kubecek * and unset for other policies. 4108cb08174SJohannes Berg */ 4118cb08174SJohannes Berg enum netlink_validation { 4128cb08174SJohannes Berg NL_VALIDATE_LIBERAL = 0, 4138cb08174SJohannes Berg NL_VALIDATE_TRAILING = BIT(0), 4148cb08174SJohannes Berg NL_VALIDATE_MAXTYPE = BIT(1), 4158cb08174SJohannes Berg NL_VALIDATE_UNSPEC = BIT(2), 4168cb08174SJohannes Berg NL_VALIDATE_STRICT_ATTRS = BIT(3), 417b424e432SMichal Kubecek NL_VALIDATE_NESTED = BIT(4), 4188cb08174SJohannes Berg }; 4198cb08174SJohannes Berg 4208cb08174SJohannes Berg #define NL_VALIDATE_DEPRECATED_STRICT (NL_VALIDATE_TRAILING |\ 4218cb08174SJohannes Berg NL_VALIDATE_MAXTYPE) 4228cb08174SJohannes Berg #define NL_VALIDATE_STRICT (NL_VALIDATE_TRAILING |\ 4238cb08174SJohannes Berg NL_VALIDATE_MAXTYPE |\ 4248cb08174SJohannes Berg NL_VALIDATE_UNSPEC |\ 425b424e432SMichal Kubecek NL_VALIDATE_STRICT_ATTRS |\ 426b424e432SMichal Kubecek NL_VALIDATE_NESTED) 4278cb08174SJohannes Berg 4284f69053bSJoe Perches int netlink_rcv_skb(struct sk_buff *skb, 4292d4bc933SJohannes Berg int (*cb)(struct sk_buff *, struct nlmsghdr *, 4302d4bc933SJohannes Berg struct netlink_ext_ack *)); 4314f69053bSJoe Perches int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, 4324f69053bSJoe Perches unsigned int group, int report, gfp_t flags); 43382ace47aSThomas Graf 4348cb08174SJohannes Berg int __nla_validate(const struct nlattr *head, int len, int maxtype, 4358cb08174SJohannes Berg const struct nla_policy *policy, unsigned int validate, 436fceb6435SJohannes Berg struct netlink_ext_ack *extack); 4378cb08174SJohannes Berg int __nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head, 4388cb08174SJohannes Berg int len, const struct nla_policy *policy, unsigned int validate, 439a5f6cba2SDavid Ahern struct netlink_ext_ack *extack); 4404f69053bSJoe Perches int nla_policy_len(const struct nla_policy *, int); 4414f69053bSJoe Perches struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype); 4424f69053bSJoe Perches size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize); 4432cf0c8b3SPhil Sutter char *nla_strdup(const struct nlattr *nla, gfp_t flags); 4444f69053bSJoe Perches int nla_memcpy(void *dest, const struct nlattr *src, int count); 4454f69053bSJoe Perches int nla_memcmp(const struct nlattr *nla, const void *data, size_t size); 4464f69053bSJoe Perches int nla_strcmp(const struct nlattr *nla, const char *str); 4474f69053bSJoe Perches struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); 448089bf1a6SNicolas Dichtel struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, 449089bf1a6SNicolas Dichtel int attrlen, int padattr); 4504f69053bSJoe Perches void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 4514f69053bSJoe Perches struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); 452089bf1a6SNicolas Dichtel struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, 453089bf1a6SNicolas Dichtel int attrlen, int padattr); 4544f69053bSJoe Perches void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 4554f69053bSJoe Perches void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, 456fe4944e5SThomas Graf const void *data); 457089bf1a6SNicolas Dichtel void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, 458089bf1a6SNicolas Dichtel const void *data, int padattr); 4594f69053bSJoe Perches void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); 4604f69053bSJoe Perches int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data); 461089bf1a6SNicolas Dichtel int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, 462089bf1a6SNicolas Dichtel const void *data, int padattr); 4634f69053bSJoe Perches int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); 4644f69053bSJoe Perches int nla_append(struct sk_buff *skb, int attrlen, const void *data); 465bfa83a9eSThomas Graf 466bfa83a9eSThomas Graf /************************************************************************** 467bfa83a9eSThomas Graf * Netlink Messages 468bfa83a9eSThomas Graf **************************************************************************/ 469bfa83a9eSThomas Graf 470bfa83a9eSThomas Graf /** 471bfa83a9eSThomas Graf * nlmsg_msg_size - length of netlink message not including padding 472bfa83a9eSThomas Graf * @payload: length of message payload 473bfa83a9eSThomas Graf */ 474bfa83a9eSThomas Graf static inline int nlmsg_msg_size(int payload) 475bfa83a9eSThomas Graf { 476bfa83a9eSThomas Graf return NLMSG_HDRLEN + payload; 477bfa83a9eSThomas Graf } 478bfa83a9eSThomas Graf 479bfa83a9eSThomas Graf /** 480bfa83a9eSThomas Graf * nlmsg_total_size - length of netlink message including padding 481bfa83a9eSThomas Graf * @payload: length of message payload 482bfa83a9eSThomas Graf */ 483bfa83a9eSThomas Graf static inline int nlmsg_total_size(int payload) 484bfa83a9eSThomas Graf { 485bfa83a9eSThomas Graf return NLMSG_ALIGN(nlmsg_msg_size(payload)); 486bfa83a9eSThomas Graf } 487bfa83a9eSThomas Graf 488bfa83a9eSThomas Graf /** 489bfa83a9eSThomas Graf * nlmsg_padlen - length of padding at the message's tail 490bfa83a9eSThomas Graf * @payload: length of message payload 491bfa83a9eSThomas Graf */ 492bfa83a9eSThomas Graf static inline int nlmsg_padlen(int payload) 493bfa83a9eSThomas Graf { 494bfa83a9eSThomas Graf return nlmsg_total_size(payload) - nlmsg_msg_size(payload); 495bfa83a9eSThomas Graf } 496bfa83a9eSThomas Graf 497bfa83a9eSThomas Graf /** 498bfa83a9eSThomas Graf * nlmsg_data - head of message payload 49970f23fd6SJustin P. Mattock * @nlh: netlink message header 500bfa83a9eSThomas Graf */ 501bfa83a9eSThomas Graf static inline void *nlmsg_data(const struct nlmsghdr *nlh) 502bfa83a9eSThomas Graf { 503bfa83a9eSThomas Graf return (unsigned char *) nlh + NLMSG_HDRLEN; 504bfa83a9eSThomas Graf } 505bfa83a9eSThomas Graf 506bfa83a9eSThomas Graf /** 507bfa83a9eSThomas Graf * nlmsg_len - length of message payload 508bfa83a9eSThomas Graf * @nlh: netlink message header 509bfa83a9eSThomas Graf */ 510bfa83a9eSThomas Graf static inline int nlmsg_len(const struct nlmsghdr *nlh) 511bfa83a9eSThomas Graf { 512bfa83a9eSThomas Graf return nlh->nlmsg_len - NLMSG_HDRLEN; 513bfa83a9eSThomas Graf } 514bfa83a9eSThomas Graf 515bfa83a9eSThomas Graf /** 516bfa83a9eSThomas Graf * nlmsg_attrdata - head of attributes data 517bfa83a9eSThomas Graf * @nlh: netlink message header 518bfa83a9eSThomas Graf * @hdrlen: length of family specific header 519bfa83a9eSThomas Graf */ 520bfa83a9eSThomas Graf static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, 521bfa83a9eSThomas Graf int hdrlen) 522bfa83a9eSThomas Graf { 523bfa83a9eSThomas Graf unsigned char *data = nlmsg_data(nlh); 524bfa83a9eSThomas Graf return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); 525bfa83a9eSThomas Graf } 526bfa83a9eSThomas Graf 527bfa83a9eSThomas Graf /** 528bfa83a9eSThomas Graf * nlmsg_attrlen - length of attributes data 529bfa83a9eSThomas Graf * @nlh: netlink message header 530bfa83a9eSThomas Graf * @hdrlen: length of family specific header 531bfa83a9eSThomas Graf */ 532bfa83a9eSThomas Graf static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) 533bfa83a9eSThomas Graf { 534bfa83a9eSThomas Graf return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); 535bfa83a9eSThomas Graf } 536bfa83a9eSThomas Graf 537bfa83a9eSThomas Graf /** 538bfa83a9eSThomas Graf * nlmsg_ok - check if the netlink message fits into the remaining bytes 539bfa83a9eSThomas Graf * @nlh: netlink message header 540bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 541bfa83a9eSThomas Graf */ 542bfa83a9eSThomas Graf static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) 543bfa83a9eSThomas Graf { 544619e803dSVegard Nossum return (remaining >= (int) sizeof(struct nlmsghdr) && 545bfa83a9eSThomas Graf nlh->nlmsg_len >= sizeof(struct nlmsghdr) && 546bfa83a9eSThomas Graf nlh->nlmsg_len <= remaining); 547bfa83a9eSThomas Graf } 548bfa83a9eSThomas Graf 549bfa83a9eSThomas Graf /** 550bfa83a9eSThomas Graf * nlmsg_next - next netlink message in message stream 551bfa83a9eSThomas Graf * @nlh: netlink message header 552bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 553bfa83a9eSThomas Graf * 554bfa83a9eSThomas Graf * Returns the next netlink message in the message stream and 555bfa83a9eSThomas Graf * decrements remaining by the size of the current message. 556bfa83a9eSThomas Graf */ 5573654654fSJan Engelhardt static inline struct nlmsghdr * 5583654654fSJan Engelhardt nlmsg_next(const struct nlmsghdr *nlh, int *remaining) 559bfa83a9eSThomas Graf { 560bfa83a9eSThomas Graf int totlen = NLMSG_ALIGN(nlh->nlmsg_len); 561bfa83a9eSThomas Graf 562bfa83a9eSThomas Graf *remaining -= totlen; 563bfa83a9eSThomas Graf 564bfa83a9eSThomas Graf return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); 565bfa83a9eSThomas Graf } 566bfa83a9eSThomas Graf 567bfa83a9eSThomas Graf /** 5683de64403SJohannes Berg * nla_parse - Parse a stream of attributes into a tb buffer 5693de64403SJohannes Berg * @tb: destination array with maxtype+1 elements 5703de64403SJohannes Berg * @maxtype: maximum attribute type to be expected 5713de64403SJohannes Berg * @head: head of attribute stream 5723de64403SJohannes Berg * @len: length of attribute stream 5733de64403SJohannes Berg * @policy: validation policy 5743de64403SJohannes Berg * @extack: extended ACK pointer 5753de64403SJohannes Berg * 5763de64403SJohannes Berg * Parses a stream of attributes and stores a pointer to each attribute in 5773de64403SJohannes Berg * the tb array accessible via the attribute type. Attributes with a type 5783de64403SJohannes Berg * exceeding maxtype will be rejected, policy must be specified, attributes 5793de64403SJohannes Berg * will be validated in the strictest way possible. 5803de64403SJohannes Berg * 5813de64403SJohannes Berg * Returns 0 on success or a negative error code. 5823de64403SJohannes Berg */ 5833de64403SJohannes Berg static inline int nla_parse(struct nlattr **tb, int maxtype, 5843de64403SJohannes Berg const struct nlattr *head, int len, 5853de64403SJohannes Berg const struct nla_policy *policy, 5863de64403SJohannes Berg struct netlink_ext_ack *extack) 5873de64403SJohannes Berg { 5883de64403SJohannes Berg return __nla_parse(tb, maxtype, head, len, policy, 5893de64403SJohannes Berg NL_VALIDATE_STRICT, extack); 5903de64403SJohannes Berg } 5913de64403SJohannes Berg 5923de64403SJohannes Berg /** 5938cb08174SJohannes Berg * nla_parse_deprecated - Parse a stream of attributes into a tb buffer 5948cb08174SJohannes Berg * @tb: destination array with maxtype+1 elements 5958cb08174SJohannes Berg * @maxtype: maximum attribute type to be expected 5968cb08174SJohannes Berg * @head: head of attribute stream 5978cb08174SJohannes Berg * @len: length of attribute stream 5988cb08174SJohannes Berg * @policy: validation policy 5998cb08174SJohannes Berg * @extack: extended ACK pointer 6008cb08174SJohannes Berg * 6018cb08174SJohannes Berg * Parses a stream of attributes and stores a pointer to each attribute in 6028cb08174SJohannes Berg * the tb array accessible via the attribute type. Attributes with a type 6038cb08174SJohannes Berg * exceeding maxtype will be ignored and attributes from the policy are not 6048cb08174SJohannes Berg * always strictly validated (only for new attributes). 6058cb08174SJohannes Berg * 6068cb08174SJohannes Berg * Returns 0 on success or a negative error code. 6078cb08174SJohannes Berg */ 6088cb08174SJohannes Berg static inline int nla_parse_deprecated(struct nlattr **tb, int maxtype, 6098cb08174SJohannes Berg const struct nlattr *head, int len, 6108cb08174SJohannes Berg const struct nla_policy *policy, 6118cb08174SJohannes Berg struct netlink_ext_ack *extack) 6128cb08174SJohannes Berg { 6138cb08174SJohannes Berg return __nla_parse(tb, maxtype, head, len, policy, 6148cb08174SJohannes Berg NL_VALIDATE_LIBERAL, extack); 6158cb08174SJohannes Berg } 6168cb08174SJohannes Berg 6178cb08174SJohannes Berg /** 6188cb08174SJohannes Berg * nla_parse_deprecated_strict - Parse a stream of attributes into a tb buffer 6198cb08174SJohannes Berg * @tb: destination array with maxtype+1 elements 6208cb08174SJohannes Berg * @maxtype: maximum attribute type to be expected 6218cb08174SJohannes Berg * @head: head of attribute stream 6228cb08174SJohannes Berg * @len: length of attribute stream 6238cb08174SJohannes Berg * @policy: validation policy 6248cb08174SJohannes Berg * @extack: extended ACK pointer 6258cb08174SJohannes Berg * 6268cb08174SJohannes Berg * Parses a stream of attributes and stores a pointer to each attribute in 6278cb08174SJohannes Berg * the tb array accessible via the attribute type. Attributes with a type 6288cb08174SJohannes Berg * exceeding maxtype will be rejected as well as trailing data, but the 6298cb08174SJohannes Berg * policy is not completely strictly validated (only for new attributes). 6308cb08174SJohannes Berg * 6318cb08174SJohannes Berg * Returns 0 on success or a negative error code. 6328cb08174SJohannes Berg */ 6338cb08174SJohannes Berg static inline int nla_parse_deprecated_strict(struct nlattr **tb, int maxtype, 6348cb08174SJohannes Berg const struct nlattr *head, 6358cb08174SJohannes Berg int len, 6368cb08174SJohannes Berg const struct nla_policy *policy, 6378cb08174SJohannes Berg struct netlink_ext_ack *extack) 6388cb08174SJohannes Berg { 6398cb08174SJohannes Berg return __nla_parse(tb, maxtype, head, len, policy, 6408cb08174SJohannes Berg NL_VALIDATE_DEPRECATED_STRICT, extack); 6418cb08174SJohannes Berg } 6428cb08174SJohannes Berg 6438cb08174SJohannes Berg /** 6448cb08174SJohannes Berg * __nlmsg_parse - parse attributes of a netlink message 645bfa83a9eSThomas Graf * @nlh: netlink message header 646bfa83a9eSThomas Graf * @hdrlen: length of family specific header 647bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 648bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 649bfa83a9eSThomas Graf * @policy: validation policy 6508cb08174SJohannes Berg * @validate: validation strictness 651fceb6435SJohannes Berg * @extack: extended ACK report struct 652bfa83a9eSThomas Graf * 653bfa83a9eSThomas Graf * See nla_parse() 654bfa83a9eSThomas Graf */ 6558cb08174SJohannes Berg static inline int __nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, 656bfa83a9eSThomas Graf struct nlattr *tb[], int maxtype, 657fceb6435SJohannes Berg const struct nla_policy *policy, 6588cb08174SJohannes Berg unsigned int validate, 659fceb6435SJohannes Berg struct netlink_ext_ack *extack) 660bfa83a9eSThomas Graf { 6613d0d4337SDavid Ahern if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) { 6623d0d4337SDavid Ahern NL_SET_ERR_MSG(extack, "Invalid header length"); 663bfa83a9eSThomas Graf return -EINVAL; 6643d0d4337SDavid Ahern } 665bfa83a9eSThomas Graf 6668cb08174SJohannes Berg return __nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), 6678cb08174SJohannes Berg nlmsg_attrlen(nlh, hdrlen), policy, validate, 6688cb08174SJohannes Berg extack); 669bfa83a9eSThomas Graf } 670bfa83a9eSThomas Graf 6718cb08174SJohannes Berg /** 6723de64403SJohannes Berg * nlmsg_parse - parse attributes of a netlink message 6733de64403SJohannes Berg * @nlh: netlink message header 6743de64403SJohannes Berg * @hdrlen: length of family specific header 6753de64403SJohannes Berg * @tb: destination array with maxtype+1 elements 6763de64403SJohannes Berg * @maxtype: maximum attribute type to be expected 6773de64403SJohannes Berg * @validate: validation strictness 6783de64403SJohannes Berg * @extack: extended ACK report struct 6793de64403SJohannes Berg * 6803de64403SJohannes Berg * See nla_parse() 6813de64403SJohannes Berg */ 6823de64403SJohannes Berg static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, 6833de64403SJohannes Berg struct nlattr *tb[], int maxtype, 6843de64403SJohannes Berg const struct nla_policy *policy, 6853de64403SJohannes Berg struct netlink_ext_ack *extack) 6863de64403SJohannes Berg { 687d00ee64eSDavid Ahern return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy, 6883de64403SJohannes Berg NL_VALIDATE_STRICT, extack); 6893de64403SJohannes Berg } 6903de64403SJohannes Berg 6913de64403SJohannes Berg /** 6928cb08174SJohannes Berg * nlmsg_parse_deprecated - parse attributes of a netlink message 6938cb08174SJohannes Berg * @nlh: netlink message header 6948cb08174SJohannes Berg * @hdrlen: length of family specific header 6958cb08174SJohannes Berg * @tb: destination array with maxtype+1 elements 6968cb08174SJohannes Berg * @maxtype: maximum attribute type to be expected 6978cb08174SJohannes Berg * @extack: extended ACK report struct 6988cb08174SJohannes Berg * 6998cb08174SJohannes Berg * See nla_parse_deprecated() 7008cb08174SJohannes Berg */ 7018cb08174SJohannes Berg static inline int nlmsg_parse_deprecated(const struct nlmsghdr *nlh, int hdrlen, 702a5f6cba2SDavid Ahern struct nlattr *tb[], int maxtype, 703a5f6cba2SDavid Ahern const struct nla_policy *policy, 704a5f6cba2SDavid Ahern struct netlink_ext_ack *extack) 705a5f6cba2SDavid Ahern { 7068cb08174SJohannes Berg return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy, 7078cb08174SJohannes Berg NL_VALIDATE_LIBERAL, extack); 708a5f6cba2SDavid Ahern } 709a5f6cba2SDavid Ahern 7108cb08174SJohannes Berg /** 7118cb08174SJohannes Berg * nlmsg_parse_deprecated_strict - parse attributes of a netlink message 7128cb08174SJohannes Berg * @nlh: netlink message header 7138cb08174SJohannes Berg * @hdrlen: length of family specific header 7148cb08174SJohannes Berg * @tb: destination array with maxtype+1 elements 7158cb08174SJohannes Berg * @maxtype: maximum attribute type to be expected 7168cb08174SJohannes Berg * @extack: extended ACK report struct 7178cb08174SJohannes Berg * 7188cb08174SJohannes Berg * See nla_parse_deprecated_strict() 7198cb08174SJohannes Berg */ 7208cb08174SJohannes Berg static inline int 7218cb08174SJohannes Berg nlmsg_parse_deprecated_strict(const struct nlmsghdr *nlh, int hdrlen, 7228cb08174SJohannes Berg struct nlattr *tb[], int maxtype, 7238cb08174SJohannes Berg const struct nla_policy *policy, 7248cb08174SJohannes Berg struct netlink_ext_ack *extack) 7258cb08174SJohannes Berg { 7268cb08174SJohannes Berg return __nlmsg_parse(nlh, hdrlen, tb, maxtype, policy, 7278cb08174SJohannes Berg NL_VALIDATE_DEPRECATED_STRICT, extack); 728a5f6cba2SDavid Ahern } 729a5f6cba2SDavid Ahern 730bfa83a9eSThomas Graf /** 731bfa83a9eSThomas Graf * nlmsg_find_attr - find a specific attribute in a netlink message 732bfa83a9eSThomas Graf * @nlh: netlink message header 733bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 734bfa83a9eSThomas Graf * @attrtype: type of attribute to look for 735bfa83a9eSThomas Graf * 736bfa83a9eSThomas Graf * Returns the first attribute which matches the specified type. 737bfa83a9eSThomas Graf */ 7386b8c92baSNelson Elhage static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, 739bfa83a9eSThomas Graf int hdrlen, int attrtype) 740bfa83a9eSThomas Graf { 741bfa83a9eSThomas Graf return nla_find(nlmsg_attrdata(nlh, hdrlen), 742bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), attrtype); 743bfa83a9eSThomas Graf } 744bfa83a9eSThomas Graf 745bfa83a9eSThomas Graf /** 7468cb08174SJohannes Berg * nla_validate_deprecated - Validate a stream of attributes 7478cb08174SJohannes Berg * @head: head of attribute stream 7488cb08174SJohannes Berg * @len: length of attribute stream 7498cb08174SJohannes Berg * @maxtype: maximum attribute type to be expected 7508cb08174SJohannes Berg * @policy: validation policy 7518cb08174SJohannes Berg * @validate: validation strictness 7528cb08174SJohannes Berg * @extack: extended ACK report struct 7538cb08174SJohannes Berg * 7548cb08174SJohannes Berg * Validates all attributes in the specified attribute stream against the 7558cb08174SJohannes Berg * specified policy. Validation is done in liberal mode. 7568cb08174SJohannes Berg * See documenation of struct nla_policy for more details. 7578cb08174SJohannes Berg * 7588cb08174SJohannes Berg * Returns 0 on success or a negative error code. 7598cb08174SJohannes Berg */ 7608cb08174SJohannes Berg static inline int nla_validate_deprecated(const struct nlattr *head, int len, 7618cb08174SJohannes Berg int maxtype, 7628cb08174SJohannes Berg const struct nla_policy *policy, 7638cb08174SJohannes Berg struct netlink_ext_ack *extack) 7648cb08174SJohannes Berg { 7658cb08174SJohannes Berg return __nla_validate(head, len, maxtype, policy, NL_VALIDATE_LIBERAL, 7668cb08174SJohannes Berg extack); 7678cb08174SJohannes Berg } 7688cb08174SJohannes Berg 7693de64403SJohannes Berg /** 7703de64403SJohannes Berg * nla_validate - Validate a stream of attributes 7713de64403SJohannes Berg * @head: head of attribute stream 7723de64403SJohannes Berg * @len: length of attribute stream 7733de64403SJohannes Berg * @maxtype: maximum attribute type to be expected 7743de64403SJohannes Berg * @policy: validation policy 7753de64403SJohannes Berg * @validate: validation strictness 7763de64403SJohannes Berg * @extack: extended ACK report struct 7773de64403SJohannes Berg * 7783de64403SJohannes Berg * Validates all attributes in the specified attribute stream against the 7793de64403SJohannes Berg * specified policy. Validation is done in strict mode. 7803de64403SJohannes Berg * See documenation of struct nla_policy for more details. 7813de64403SJohannes Berg * 7823de64403SJohannes Berg * Returns 0 on success or a negative error code. 7833de64403SJohannes Berg */ 7843de64403SJohannes Berg static inline int nla_validate(const struct nlattr *head, int len, int maxtype, 7853de64403SJohannes Berg const struct nla_policy *policy, 7863de64403SJohannes Berg struct netlink_ext_ack *extack) 7873de64403SJohannes Berg { 7883de64403SJohannes Berg return __nla_validate(head, len, maxtype, policy, NL_VALIDATE_STRICT, 7893de64403SJohannes Berg extack); 7903de64403SJohannes Berg } 7918cb08174SJohannes Berg 7928cb08174SJohannes Berg /** 7938cb08174SJohannes Berg * nlmsg_validate_deprecated - validate a netlink message including attributes 794bfa83a9eSThomas Graf * @nlh: netlinket message header 795bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 796bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 797bfa83a9eSThomas Graf * @policy: validation policy 798fceb6435SJohannes Berg * @extack: extended ACK report struct 799bfa83a9eSThomas Graf */ 8008cb08174SJohannes Berg static inline int nlmsg_validate_deprecated(const struct nlmsghdr *nlh, 8013654654fSJan Engelhardt int hdrlen, int maxtype, 802fceb6435SJohannes Berg const struct nla_policy *policy, 803fceb6435SJohannes Berg struct netlink_ext_ack *extack) 804bfa83a9eSThomas Graf { 805bfa83a9eSThomas Graf if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) 806bfa83a9eSThomas Graf return -EINVAL; 807bfa83a9eSThomas Graf 8088cb08174SJohannes Berg return __nla_validate(nlmsg_attrdata(nlh, hdrlen), 8098cb08174SJohannes Berg nlmsg_attrlen(nlh, hdrlen), maxtype, 8108cb08174SJohannes Berg policy, NL_VALIDATE_LIBERAL, extack); 811bfa83a9eSThomas Graf } 812bfa83a9eSThomas Graf 8138cb08174SJohannes Berg 8148cb08174SJohannes Berg 815bfa83a9eSThomas Graf /** 81697676b6bSThomas Graf * nlmsg_report - need to report back to application? 81797676b6bSThomas Graf * @nlh: netlink message header 81897676b6bSThomas Graf * 81997676b6bSThomas Graf * Returns 1 if a report back to the application is requested. 82097676b6bSThomas Graf */ 8213a6c2b41SPatrick McHardy static inline int nlmsg_report(const struct nlmsghdr *nlh) 82297676b6bSThomas Graf { 82397676b6bSThomas Graf return !!(nlh->nlmsg_flags & NLM_F_ECHO); 82497676b6bSThomas Graf } 82597676b6bSThomas Graf 82697676b6bSThomas Graf /** 827bfa83a9eSThomas Graf * nlmsg_for_each_attr - iterate over a stream of attributes 828bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 829bfa83a9eSThomas Graf * @nlh: netlink message header 830bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 831bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 832bfa83a9eSThomas Graf */ 833bfa83a9eSThomas Graf #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ 834bfa83a9eSThomas Graf nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ 835bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), rem) 836bfa83a9eSThomas Graf 837bfa83a9eSThomas Graf /** 838bfa83a9eSThomas Graf * nlmsg_put - Add a new netlink message to an skb 839bfa83a9eSThomas Graf * @skb: socket buffer to store message in 8402c6ba4b1SNicolas Dichtel * @portid: netlink PORTID of requesting application 841bfa83a9eSThomas Graf * @seq: sequence number of message 842bfa83a9eSThomas Graf * @type: message type 843bfa83a9eSThomas Graf * @payload: length of message payload 844bfa83a9eSThomas Graf * @flags: message flags 845bfa83a9eSThomas Graf * 846bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 847bfa83a9eSThomas Graf * the message header and payload. 848bfa83a9eSThomas Graf */ 84915e47304SEric W. Biederman static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, 850bfa83a9eSThomas Graf int type, int payload, int flags) 851bfa83a9eSThomas Graf { 852bfa83a9eSThomas Graf if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) 853bfa83a9eSThomas Graf return NULL; 854bfa83a9eSThomas Graf 85515e47304SEric W. Biederman return __nlmsg_put(skb, portid, seq, type, payload, flags); 856bfa83a9eSThomas Graf } 857bfa83a9eSThomas Graf 858bfa83a9eSThomas Graf /** 859bfa83a9eSThomas Graf * nlmsg_put_answer - Add a new callback based netlink message to an skb 860bfa83a9eSThomas Graf * @skb: socket buffer to store message in 861bfa83a9eSThomas Graf * @cb: netlink callback 862bfa83a9eSThomas Graf * @type: message type 863bfa83a9eSThomas Graf * @payload: length of message payload 864bfa83a9eSThomas Graf * @flags: message flags 865bfa83a9eSThomas Graf * 866bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 867bfa83a9eSThomas Graf * the message header and payload. 868bfa83a9eSThomas Graf */ 869bfa83a9eSThomas Graf static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, 870bfa83a9eSThomas Graf struct netlink_callback *cb, 871bfa83a9eSThomas Graf int type, int payload, 872bfa83a9eSThomas Graf int flags) 873bfa83a9eSThomas Graf { 87415e47304SEric W. Biederman return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 875bfa83a9eSThomas Graf type, payload, flags); 876bfa83a9eSThomas Graf } 877bfa83a9eSThomas Graf 878bfa83a9eSThomas Graf /** 879bfa83a9eSThomas Graf * nlmsg_new - Allocate a new netlink message 880339bf98fSThomas Graf * @payload: size of the message payload 881fe4944e5SThomas Graf * @flags: the type of memory to allocate. 882bfa83a9eSThomas Graf * 883339bf98fSThomas Graf * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known 884339bf98fSThomas Graf * and a good default is needed. 885bfa83a9eSThomas Graf */ 886339bf98fSThomas Graf static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) 887bfa83a9eSThomas Graf { 888339bf98fSThomas Graf return alloc_skb(nlmsg_total_size(payload), flags); 889bfa83a9eSThomas Graf } 890bfa83a9eSThomas Graf 891bfa83a9eSThomas Graf /** 892bfa83a9eSThomas Graf * nlmsg_end - Finalize a netlink message 893bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 894bfa83a9eSThomas Graf * @nlh: netlink message header 895bfa83a9eSThomas Graf * 896bfa83a9eSThomas Graf * Corrects the netlink message header to include the appeneded 897bfa83a9eSThomas Graf * attributes. Only necessary if attributes have been added to 898bfa83a9eSThomas Graf * the message. 899bfa83a9eSThomas Graf */ 900053c095aSJohannes Berg static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) 901bfa83a9eSThomas Graf { 90227a884dcSArnaldo Carvalho de Melo nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; 903bfa83a9eSThomas Graf } 904bfa83a9eSThomas Graf 905bfa83a9eSThomas Graf /** 906fe4944e5SThomas Graf * nlmsg_get_pos - return current position in netlink message 907fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 908fe4944e5SThomas Graf * 909fe4944e5SThomas Graf * Returns a pointer to the current tail of the message. 910fe4944e5SThomas Graf */ 911fe4944e5SThomas Graf static inline void *nlmsg_get_pos(struct sk_buff *skb) 912fe4944e5SThomas Graf { 91327a884dcSArnaldo Carvalho de Melo return skb_tail_pointer(skb); 914fe4944e5SThomas Graf } 915fe4944e5SThomas Graf 916fe4944e5SThomas Graf /** 917fe4944e5SThomas Graf * nlmsg_trim - Trim message to a mark 918fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 919fe4944e5SThomas Graf * @mark: mark to trim to 920fe4944e5SThomas Graf * 921bc3ed28cSThomas Graf * Trims the message to the provided mark. 922fe4944e5SThomas Graf */ 923bc3ed28cSThomas Graf static inline void nlmsg_trim(struct sk_buff *skb, const void *mark) 924fe4944e5SThomas Graf { 925149118d8SThomas Graf if (mark) { 926149118d8SThomas Graf WARN_ON((unsigned char *) mark < skb->data); 927fe4944e5SThomas Graf skb_trim(skb, (unsigned char *) mark - skb->data); 928fe4944e5SThomas Graf } 929149118d8SThomas Graf } 930fe4944e5SThomas Graf 931fe4944e5SThomas Graf /** 932bfa83a9eSThomas Graf * nlmsg_cancel - Cancel construction of a netlink message 933bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 934bfa83a9eSThomas Graf * @nlh: netlink message header 935bfa83a9eSThomas Graf * 936bfa83a9eSThomas Graf * Removes the complete netlink message including all 937bc3ed28cSThomas Graf * attributes from the socket buffer again. 938bfa83a9eSThomas Graf */ 939bc3ed28cSThomas Graf static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) 940bfa83a9eSThomas Graf { 941bc3ed28cSThomas Graf nlmsg_trim(skb, nlh); 942bfa83a9eSThomas Graf } 943bfa83a9eSThomas Graf 944bfa83a9eSThomas Graf /** 945bfa83a9eSThomas Graf * nlmsg_free - free a netlink message 946bfa83a9eSThomas Graf * @skb: socket buffer of netlink message 947bfa83a9eSThomas Graf */ 948bfa83a9eSThomas Graf static inline void nlmsg_free(struct sk_buff *skb) 949bfa83a9eSThomas Graf { 950bfa83a9eSThomas Graf kfree_skb(skb); 951bfa83a9eSThomas Graf } 952bfa83a9eSThomas Graf 953bfa83a9eSThomas Graf /** 954bfa83a9eSThomas Graf * nlmsg_multicast - multicast a netlink message 955bfa83a9eSThomas Graf * @sk: netlink socket to spread messages to 956bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 95715e47304SEric W. Biederman * @portid: own netlink portid to avoid sending to yourself 958bfa83a9eSThomas Graf * @group: multicast group id 959d387f6adSThomas Graf * @flags: allocation flags 960bfa83a9eSThomas Graf */ 961bfa83a9eSThomas Graf static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, 96215e47304SEric W. Biederman u32 portid, unsigned int group, gfp_t flags) 963bfa83a9eSThomas Graf { 964bfa83a9eSThomas Graf int err; 965bfa83a9eSThomas Graf 966bfa83a9eSThomas Graf NETLINK_CB(skb).dst_group = group; 967bfa83a9eSThomas Graf 96815e47304SEric W. Biederman err = netlink_broadcast(sk, skb, portid, group, flags); 969bfa83a9eSThomas Graf if (err > 0) 970bfa83a9eSThomas Graf err = 0; 971bfa83a9eSThomas Graf 972bfa83a9eSThomas Graf return err; 973bfa83a9eSThomas Graf } 974bfa83a9eSThomas Graf 975bfa83a9eSThomas Graf /** 976bfa83a9eSThomas Graf * nlmsg_unicast - unicast a netlink message 977bfa83a9eSThomas Graf * @sk: netlink socket to spread message to 978bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 97915e47304SEric W. Biederman * @portid: netlink portid of the destination socket 980bfa83a9eSThomas Graf */ 98115e47304SEric W. Biederman static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid) 982bfa83a9eSThomas Graf { 983bfa83a9eSThomas Graf int err; 984bfa83a9eSThomas Graf 98515e47304SEric W. Biederman err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT); 986bfa83a9eSThomas Graf if (err > 0) 987bfa83a9eSThomas Graf err = 0; 988bfa83a9eSThomas Graf 989bfa83a9eSThomas Graf return err; 990bfa83a9eSThomas Graf } 991bfa83a9eSThomas Graf 992bfa83a9eSThomas Graf /** 993bfa83a9eSThomas Graf * nlmsg_for_each_msg - iterate over a stream of messages 994bfa83a9eSThomas Graf * @pos: loop counter, set to current message 995bfa83a9eSThomas Graf * @head: head of message stream 996bfa83a9eSThomas Graf * @len: length of message stream 997bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 998bfa83a9eSThomas Graf */ 999bfa83a9eSThomas Graf #define nlmsg_for_each_msg(pos, head, len, rem) \ 1000bfa83a9eSThomas Graf for (pos = head, rem = len; \ 1001bfa83a9eSThomas Graf nlmsg_ok(pos, rem); \ 1002bfa83a9eSThomas Graf pos = nlmsg_next(pos, &(rem))) 1003bfa83a9eSThomas Graf 1004670dc283SJohannes Berg /** 1005670dc283SJohannes Berg * nl_dump_check_consistent - check if sequence is consistent and advertise if not 1006670dc283SJohannes Berg * @cb: netlink callback structure that stores the sequence number 1007670dc283SJohannes Berg * @nlh: netlink message header to write the flag to 1008670dc283SJohannes Berg * 1009670dc283SJohannes Berg * This function checks if the sequence (generation) number changed during dump 1010670dc283SJohannes Berg * and if it did, advertises it in the netlink message header. 1011670dc283SJohannes Berg * 1012670dc283SJohannes Berg * The correct way to use it is to set cb->seq to the generation counter when 1013670dc283SJohannes Berg * all locks for dumping have been acquired, and then call this function for 1014670dc283SJohannes Berg * each message that is generated. 1015670dc283SJohannes Berg * 1016670dc283SJohannes Berg * Note that due to initialisation concerns, 0 is an invalid sequence number 1017670dc283SJohannes Berg * and must not be used by code that uses this functionality. 1018670dc283SJohannes Berg */ 1019670dc283SJohannes Berg static inline void 1020670dc283SJohannes Berg nl_dump_check_consistent(struct netlink_callback *cb, 1021670dc283SJohannes Berg struct nlmsghdr *nlh) 1022670dc283SJohannes Berg { 1023670dc283SJohannes Berg if (cb->prev_seq && cb->seq != cb->prev_seq) 1024670dc283SJohannes Berg nlh->nlmsg_flags |= NLM_F_DUMP_INTR; 1025670dc283SJohannes Berg cb->prev_seq = cb->seq; 1026670dc283SJohannes Berg } 1027670dc283SJohannes Berg 1028bfa83a9eSThomas Graf /************************************************************************** 1029bfa83a9eSThomas Graf * Netlink Attributes 1030bfa83a9eSThomas Graf **************************************************************************/ 1031bfa83a9eSThomas Graf 1032bfa83a9eSThomas Graf /** 1033bfa83a9eSThomas Graf * nla_attr_size - length of attribute not including padding 1034bfa83a9eSThomas Graf * @payload: length of payload 1035bfa83a9eSThomas Graf */ 1036bfa83a9eSThomas Graf static inline int nla_attr_size(int payload) 1037bfa83a9eSThomas Graf { 1038bfa83a9eSThomas Graf return NLA_HDRLEN + payload; 1039bfa83a9eSThomas Graf } 1040bfa83a9eSThomas Graf 1041bfa83a9eSThomas Graf /** 1042bfa83a9eSThomas Graf * nla_total_size - total length of attribute including padding 1043bfa83a9eSThomas Graf * @payload: length of payload 1044bfa83a9eSThomas Graf */ 1045bfa83a9eSThomas Graf static inline int nla_total_size(int payload) 1046bfa83a9eSThomas Graf { 1047bfa83a9eSThomas Graf return NLA_ALIGN(nla_attr_size(payload)); 1048bfa83a9eSThomas Graf } 1049bfa83a9eSThomas Graf 1050bfa83a9eSThomas Graf /** 1051bfa83a9eSThomas Graf * nla_padlen - length of padding at the tail of attribute 1052bfa83a9eSThomas Graf * @payload: length of payload 1053bfa83a9eSThomas Graf */ 1054bfa83a9eSThomas Graf static inline int nla_padlen(int payload) 1055bfa83a9eSThomas Graf { 1056bfa83a9eSThomas Graf return nla_total_size(payload) - nla_attr_size(payload); 1057bfa83a9eSThomas Graf } 1058bfa83a9eSThomas Graf 1059bfa83a9eSThomas Graf /** 10608f4c1f9bSThomas Graf * nla_type - attribute type 10618f4c1f9bSThomas Graf * @nla: netlink attribute 10628f4c1f9bSThomas Graf */ 10638f4c1f9bSThomas Graf static inline int nla_type(const struct nlattr *nla) 10648f4c1f9bSThomas Graf { 10658f4c1f9bSThomas Graf return nla->nla_type & NLA_TYPE_MASK; 10668f4c1f9bSThomas Graf } 10678f4c1f9bSThomas Graf 10688f4c1f9bSThomas Graf /** 1069bfa83a9eSThomas Graf * nla_data - head of payload 1070bfa83a9eSThomas Graf * @nla: netlink attribute 1071bfa83a9eSThomas Graf */ 1072bfa83a9eSThomas Graf static inline void *nla_data(const struct nlattr *nla) 1073bfa83a9eSThomas Graf { 1074bfa83a9eSThomas Graf return (char *) nla + NLA_HDRLEN; 1075bfa83a9eSThomas Graf } 1076bfa83a9eSThomas Graf 1077bfa83a9eSThomas Graf /** 1078bfa83a9eSThomas Graf * nla_len - length of payload 1079bfa83a9eSThomas Graf * @nla: netlink attribute 1080bfa83a9eSThomas Graf */ 1081bfa83a9eSThomas Graf static inline int nla_len(const struct nlattr *nla) 1082bfa83a9eSThomas Graf { 1083bfa83a9eSThomas Graf return nla->nla_len - NLA_HDRLEN; 1084bfa83a9eSThomas Graf } 1085bfa83a9eSThomas Graf 1086bfa83a9eSThomas Graf /** 1087bfa83a9eSThomas Graf * nla_ok - check if the netlink attribute fits into the remaining bytes 1088bfa83a9eSThomas Graf * @nla: netlink attribute 1089bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 1090bfa83a9eSThomas Graf */ 1091bfa83a9eSThomas Graf static inline int nla_ok(const struct nlattr *nla, int remaining) 1092bfa83a9eSThomas Graf { 10933e1ed981SAlexey Dobriyan return remaining >= (int) sizeof(*nla) && 10943e1ed981SAlexey Dobriyan nla->nla_len >= sizeof(*nla) && 1095bfa83a9eSThomas Graf nla->nla_len <= remaining; 1096bfa83a9eSThomas Graf } 1097bfa83a9eSThomas Graf 1098bfa83a9eSThomas Graf /** 1099d1ec3b77SPierre Ynard * nla_next - next netlink attribute in attribute stream 1100bfa83a9eSThomas Graf * @nla: netlink attribute 1101bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 1102bfa83a9eSThomas Graf * 1103bfa83a9eSThomas Graf * Returns the next netlink attribute in the attribute stream and 1104bfa83a9eSThomas Graf * decrements remaining by the size of the current attribute. 1105bfa83a9eSThomas Graf */ 1106bfa83a9eSThomas Graf static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) 1107bfa83a9eSThomas Graf { 11083b2c75d3SAlexey Dobriyan unsigned int totlen = NLA_ALIGN(nla->nla_len); 1109bfa83a9eSThomas Graf 1110bfa83a9eSThomas Graf *remaining -= totlen; 1111bfa83a9eSThomas Graf return (struct nlattr *) ((char *) nla + totlen); 1112bfa83a9eSThomas Graf } 1113bfa83a9eSThomas Graf 1114bfa83a9eSThomas Graf /** 1115fe4944e5SThomas Graf * nla_find_nested - find attribute in a set of nested attributes 1116fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 1117fe4944e5SThomas Graf * @attrtype: type of attribute to look for 1118fe4944e5SThomas Graf * 1119fe4944e5SThomas Graf * Returns the first attribute which matches the specified type. 1120fe4944e5SThomas Graf */ 11213654654fSJan Engelhardt static inline struct nlattr * 11223654654fSJan Engelhardt nla_find_nested(const struct nlattr *nla, int attrtype) 1123fe4944e5SThomas Graf { 1124fe4944e5SThomas Graf return nla_find(nla_data(nla), nla_len(nla), attrtype); 1125fe4944e5SThomas Graf } 1126fe4944e5SThomas Graf 1127fe4944e5SThomas Graf /** 11283de64403SJohannes Berg * nla_parse_nested - parse nested attributes 11293de64403SJohannes Berg * @tb: destination array with maxtype+1 elements 11303de64403SJohannes Berg * @maxtype: maximum attribute type to be expected 11313de64403SJohannes Berg * @nla: attribute containing the nested attributes 11323de64403SJohannes Berg * @policy: validation policy 11333de64403SJohannes Berg * @extack: extended ACK report struct 11343de64403SJohannes Berg * 11353de64403SJohannes Berg * See nla_parse() 11363de64403SJohannes Berg */ 11373de64403SJohannes Berg static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, 11383de64403SJohannes Berg const struct nlattr *nla, 11393de64403SJohannes Berg const struct nla_policy *policy, 11403de64403SJohannes Berg struct netlink_ext_ack *extack) 11413de64403SJohannes Berg { 1142b424e432SMichal Kubecek if (!(nla->nla_type & NLA_F_NESTED)) { 1143b424e432SMichal Kubecek NL_SET_ERR_MSG_ATTR(extack, nla, "NLA_F_NESTED is missing"); 1144b424e432SMichal Kubecek return -EINVAL; 1145b424e432SMichal Kubecek } 1146b424e432SMichal Kubecek 11473de64403SJohannes Berg return __nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy, 11483de64403SJohannes Berg NL_VALIDATE_STRICT, extack); 11493de64403SJohannes Berg } 11503de64403SJohannes Berg 11513de64403SJohannes Berg /** 11528cb08174SJohannes Berg * nla_parse_nested_deprecated - parse nested attributes 1153bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 1154bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 1155bfa83a9eSThomas Graf * @nla: attribute containing the nested attributes 1156bfa83a9eSThomas Graf * @policy: validation policy 1157fceb6435SJohannes Berg * @extack: extended ACK report struct 1158bfa83a9eSThomas Graf * 11598cb08174SJohannes Berg * See nla_parse_deprecated() 1160bfa83a9eSThomas Graf */ 11618cb08174SJohannes Berg static inline int nla_parse_nested_deprecated(struct nlattr *tb[], int maxtype, 1162b057efd4SPatrick McHardy const struct nlattr *nla, 1163fceb6435SJohannes Berg const struct nla_policy *policy, 1164fceb6435SJohannes Berg struct netlink_ext_ack *extack) 1165bfa83a9eSThomas Graf { 11668cb08174SJohannes Berg return __nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy, 11678cb08174SJohannes Berg NL_VALIDATE_LIBERAL, extack); 1168bfa83a9eSThomas Graf } 11691092cb21SPatrick McHardy 11701092cb21SPatrick McHardy /** 1171d1ec3b77SPierre Ynard * nla_put_u8 - Add a u8 netlink attribute to a socket buffer 1172bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1173bfa83a9eSThomas Graf * @attrtype: attribute type 1174bfa83a9eSThomas Graf * @value: numeric value 1175bfa83a9eSThomas Graf */ 1176bfa83a9eSThomas Graf static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) 1177bfa83a9eSThomas Graf { 1178b4391db4SArnd Bergmann /* temporary variables to work around GCC PR81715 with asan-stack=1 */ 1179b4391db4SArnd Bergmann u8 tmp = value; 1180b4391db4SArnd Bergmann 1181b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(u8), &tmp); 1182bfa83a9eSThomas Graf } 1183bfa83a9eSThomas Graf 1184bfa83a9eSThomas Graf /** 1185bfa83a9eSThomas Graf * nla_put_u16 - Add a u16 netlink attribute to a socket buffer 1186bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1187bfa83a9eSThomas Graf * @attrtype: attribute type 1188bfa83a9eSThomas Graf * @value: numeric value 1189bfa83a9eSThomas Graf */ 1190bfa83a9eSThomas Graf static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) 1191bfa83a9eSThomas Graf { 1192b4391db4SArnd Bergmann u16 tmp = value; 1193b4391db4SArnd Bergmann 1194b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(u16), &tmp); 1195bfa83a9eSThomas Graf } 1196bfa83a9eSThomas Graf 1197bfa83a9eSThomas Graf /** 1198569a8fc3SDavid S. Miller * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer 1199569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 1200569a8fc3SDavid S. Miller * @attrtype: attribute type 1201569a8fc3SDavid S. Miller * @value: numeric value 1202569a8fc3SDavid S. Miller */ 1203569a8fc3SDavid S. Miller static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value) 1204569a8fc3SDavid S. Miller { 1205b4391db4SArnd Bergmann __be16 tmp = value; 1206b4391db4SArnd Bergmann 1207b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__be16), &tmp); 1208569a8fc3SDavid S. Miller } 1209569a8fc3SDavid S. Miller 1210569a8fc3SDavid S. Miller /** 12116c1dd3b6SDavid S. Miller * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer 12126c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 12136c1dd3b6SDavid S. Miller * @attrtype: attribute type 12146c1dd3b6SDavid S. Miller * @value: numeric value 12156c1dd3b6SDavid S. Miller */ 12166c1dd3b6SDavid S. Miller static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value) 12176c1dd3b6SDavid S. Miller { 1218b4391db4SArnd Bergmann __be16 tmp = value; 1219b4391db4SArnd Bergmann 1220b4391db4SArnd Bergmann return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, tmp); 12216c1dd3b6SDavid S. Miller } 12226c1dd3b6SDavid S. Miller 12236c1dd3b6SDavid S. Miller /** 122424c410dcSDavid S. Miller * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer 122524c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 122624c410dcSDavid S. Miller * @attrtype: attribute type 122724c410dcSDavid S. Miller * @value: numeric value 122824c410dcSDavid S. Miller */ 122924c410dcSDavid S. Miller static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value) 123024c410dcSDavid S. Miller { 1231b4391db4SArnd Bergmann __le16 tmp = value; 1232b4391db4SArnd Bergmann 1233b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__le16), &tmp); 123424c410dcSDavid S. Miller } 123524c410dcSDavid S. Miller 123624c410dcSDavid S. Miller /** 1237bfa83a9eSThomas Graf * nla_put_u32 - Add a u32 netlink attribute to a socket buffer 1238bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1239bfa83a9eSThomas Graf * @attrtype: attribute type 1240bfa83a9eSThomas Graf * @value: numeric value 1241bfa83a9eSThomas Graf */ 1242bfa83a9eSThomas Graf static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) 1243bfa83a9eSThomas Graf { 1244b4391db4SArnd Bergmann u32 tmp = value; 1245b4391db4SArnd Bergmann 1246b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(u32), &tmp); 1247bfa83a9eSThomas Graf } 1248bfa83a9eSThomas Graf 1249bfa83a9eSThomas Graf /** 1250569a8fc3SDavid S. Miller * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer 1251569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 1252569a8fc3SDavid S. Miller * @attrtype: attribute type 1253569a8fc3SDavid S. Miller * @value: numeric value 1254569a8fc3SDavid S. Miller */ 1255569a8fc3SDavid S. Miller static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value) 1256569a8fc3SDavid S. Miller { 1257b4391db4SArnd Bergmann __be32 tmp = value; 1258b4391db4SArnd Bergmann 1259b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__be32), &tmp); 1260569a8fc3SDavid S. Miller } 1261569a8fc3SDavid S. Miller 1262569a8fc3SDavid S. Miller /** 12636c1dd3b6SDavid S. Miller * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer 12646c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 12656c1dd3b6SDavid S. Miller * @attrtype: attribute type 12666c1dd3b6SDavid S. Miller * @value: numeric value 12676c1dd3b6SDavid S. Miller */ 12686c1dd3b6SDavid S. Miller static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value) 12696c1dd3b6SDavid S. Miller { 1270b4391db4SArnd Bergmann __be32 tmp = value; 1271b4391db4SArnd Bergmann 1272b4391db4SArnd Bergmann return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, tmp); 12736c1dd3b6SDavid S. Miller } 12746c1dd3b6SDavid S. Miller 12756c1dd3b6SDavid S. Miller /** 127624c410dcSDavid S. Miller * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer 127724c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 127824c410dcSDavid S. Miller * @attrtype: attribute type 127924c410dcSDavid S. Miller * @value: numeric value 128024c410dcSDavid S. Miller */ 128124c410dcSDavid S. Miller static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value) 128224c410dcSDavid S. Miller { 1283b4391db4SArnd Bergmann __le32 tmp = value; 1284b4391db4SArnd Bergmann 1285b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__le32), &tmp); 128624c410dcSDavid S. Miller } 128724c410dcSDavid S. Miller 128824c410dcSDavid S. Miller /** 128973520786SNicolas Dichtel * nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it 129073520786SNicolas Dichtel * @skb: socket buffer to add attribute to 129173520786SNicolas Dichtel * @attrtype: attribute type 129273520786SNicolas Dichtel * @value: numeric value 129373520786SNicolas Dichtel * @padattr: attribute type for the padding 129473520786SNicolas Dichtel */ 129573520786SNicolas Dichtel static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype, 129673520786SNicolas Dichtel u64 value, int padattr) 129773520786SNicolas Dichtel { 1298b4391db4SArnd Bergmann u64 tmp = value; 1299b4391db4SArnd Bergmann 1300b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); 130173520786SNicolas Dichtel } 130273520786SNicolas Dichtel 130373520786SNicolas Dichtel /** 1304b46f6dedSNicolas Dichtel * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it 1305569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 1306569a8fc3SDavid S. Miller * @attrtype: attribute type 1307569a8fc3SDavid S. Miller * @value: numeric value 1308b46f6dedSNicolas Dichtel * @padattr: attribute type for the padding 1309569a8fc3SDavid S. Miller */ 1310b46f6dedSNicolas Dichtel static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value, 1311b46f6dedSNicolas Dichtel int padattr) 1312b46f6dedSNicolas Dichtel { 1313b4391db4SArnd Bergmann __be64 tmp = value; 1314b4391db4SArnd Bergmann 1315b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(__be64), &tmp, padattr); 1316b46f6dedSNicolas Dichtel } 1317b46f6dedSNicolas Dichtel 1318569a8fc3SDavid S. Miller /** 1319e9bbe898SNicolas Dichtel * nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it 13206c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 13216c1dd3b6SDavid S. Miller * @attrtype: attribute type 13226c1dd3b6SDavid S. Miller * @value: numeric value 1323e9bbe898SNicolas Dichtel * @padattr: attribute type for the padding 13246c1dd3b6SDavid S. Miller */ 1325e9bbe898SNicolas Dichtel static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value, 1326e9bbe898SNicolas Dichtel int padattr) 13276c1dd3b6SDavid S. Miller { 1328b4391db4SArnd Bergmann __be64 tmp = value; 1329b4391db4SArnd Bergmann 1330b4391db4SArnd Bergmann return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, tmp, 1331e9bbe898SNicolas Dichtel padattr); 13326c1dd3b6SDavid S. Miller } 13336c1dd3b6SDavid S. Miller 13346c1dd3b6SDavid S. Miller /** 1335e7479122SNicolas Dichtel * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it 133624c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 133724c410dcSDavid S. Miller * @attrtype: attribute type 133824c410dcSDavid S. Miller * @value: numeric value 1339e7479122SNicolas Dichtel * @padattr: attribute type for the padding 134024c410dcSDavid S. Miller */ 1341e7479122SNicolas Dichtel static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value, 1342e7479122SNicolas Dichtel int padattr) 134324c410dcSDavid S. Miller { 1344b4391db4SArnd Bergmann __le64 tmp = value; 1345b4391db4SArnd Bergmann 1346b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(__le64), &tmp, padattr); 134724c410dcSDavid S. Miller } 134824c410dcSDavid S. Miller 134924c410dcSDavid S. Miller /** 13504778e0beSJiri Pirko * nla_put_s8 - Add a s8 netlink attribute to a socket buffer 13514778e0beSJiri Pirko * @skb: socket buffer to add attribute to 13524778e0beSJiri Pirko * @attrtype: attribute type 13534778e0beSJiri Pirko * @value: numeric value 13544778e0beSJiri Pirko */ 13554778e0beSJiri Pirko static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value) 13564778e0beSJiri Pirko { 1357b4391db4SArnd Bergmann s8 tmp = value; 1358b4391db4SArnd Bergmann 1359b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(s8), &tmp); 13604778e0beSJiri Pirko } 13614778e0beSJiri Pirko 13624778e0beSJiri Pirko /** 13634778e0beSJiri Pirko * nla_put_s16 - Add a s16 netlink attribute to a socket buffer 13644778e0beSJiri Pirko * @skb: socket buffer to add attribute to 13654778e0beSJiri Pirko * @attrtype: attribute type 13664778e0beSJiri Pirko * @value: numeric value 13674778e0beSJiri Pirko */ 13684778e0beSJiri Pirko static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value) 13694778e0beSJiri Pirko { 1370b4391db4SArnd Bergmann s16 tmp = value; 1371b4391db4SArnd Bergmann 1372b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(s16), &tmp); 13734778e0beSJiri Pirko } 13744778e0beSJiri Pirko 13754778e0beSJiri Pirko /** 13764778e0beSJiri Pirko * nla_put_s32 - Add a s32 netlink attribute to a socket buffer 13774778e0beSJiri Pirko * @skb: socket buffer to add attribute to 13784778e0beSJiri Pirko * @attrtype: attribute type 13794778e0beSJiri Pirko * @value: numeric value 13804778e0beSJiri Pirko */ 13814778e0beSJiri Pirko static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value) 13824778e0beSJiri Pirko { 1383b4391db4SArnd Bergmann s32 tmp = value; 1384b4391db4SArnd Bergmann 1385b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(s32), &tmp); 13864778e0beSJiri Pirko } 13874778e0beSJiri Pirko 13884778e0beSJiri Pirko /** 1389756a2f59SNicolas Dichtel * nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it 13904778e0beSJiri Pirko * @skb: socket buffer to add attribute to 13914778e0beSJiri Pirko * @attrtype: attribute type 13924778e0beSJiri Pirko * @value: numeric value 1393756a2f59SNicolas Dichtel * @padattr: attribute type for the padding 13944778e0beSJiri Pirko */ 1395756a2f59SNicolas Dichtel static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value, 1396756a2f59SNicolas Dichtel int padattr) 13974778e0beSJiri Pirko { 1398b4391db4SArnd Bergmann s64 tmp = value; 1399b4391db4SArnd Bergmann 1400b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(s64), &tmp, padattr); 14014778e0beSJiri Pirko } 14024778e0beSJiri Pirko 14034778e0beSJiri Pirko /** 1404bfa83a9eSThomas Graf * nla_put_string - Add a string netlink attribute to a socket buffer 1405bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1406bfa83a9eSThomas Graf * @attrtype: attribute type 1407bfa83a9eSThomas Graf * @str: NUL terminated string 1408bfa83a9eSThomas Graf */ 1409bfa83a9eSThomas Graf static inline int nla_put_string(struct sk_buff *skb, int attrtype, 1410bfa83a9eSThomas Graf const char *str) 1411bfa83a9eSThomas Graf { 1412bfa83a9eSThomas Graf return nla_put(skb, attrtype, strlen(str) + 1, str); 1413bfa83a9eSThomas Graf } 1414bfa83a9eSThomas Graf 1415bfa83a9eSThomas Graf /** 1416bfa83a9eSThomas Graf * nla_put_flag - Add a flag netlink attribute to a socket buffer 1417bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1418bfa83a9eSThomas Graf * @attrtype: attribute type 1419bfa83a9eSThomas Graf */ 1420bfa83a9eSThomas Graf static inline int nla_put_flag(struct sk_buff *skb, int attrtype) 1421bfa83a9eSThomas Graf { 1422bfa83a9eSThomas Graf return nla_put(skb, attrtype, 0, NULL); 1423bfa83a9eSThomas Graf } 1424bfa83a9eSThomas Graf 1425bfa83a9eSThomas Graf /** 14262175d87cSNicolas Dichtel * nla_put_msecs - Add a msecs netlink attribute to a skb and align it 1427bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1428bfa83a9eSThomas Graf * @attrtype: attribute type 1429d87de1f3SMark Rustad * @njiffies: number of jiffies to convert to msecs 14302175d87cSNicolas Dichtel * @padattr: attribute type for the padding 1431bfa83a9eSThomas Graf */ 1432bfa83a9eSThomas Graf static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, 14332175d87cSNicolas Dichtel unsigned long njiffies, int padattr) 1434bfa83a9eSThomas Graf { 1435d87de1f3SMark Rustad u64 tmp = jiffies_to_msecs(njiffies); 14362175d87cSNicolas Dichtel 14372175d87cSNicolas Dichtel return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); 1438bfa83a9eSThomas Graf } 1439bfa83a9eSThomas Graf 1440bfa83a9eSThomas Graf /** 1441930345eaSJiri Benc * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket 1442930345eaSJiri Benc * buffer 1443930345eaSJiri Benc * @skb: socket buffer to add attribute to 1444930345eaSJiri Benc * @attrtype: attribute type 1445930345eaSJiri Benc * @addr: IPv4 address 1446930345eaSJiri Benc */ 1447930345eaSJiri Benc static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype, 1448930345eaSJiri Benc __be32 addr) 1449930345eaSJiri Benc { 1450b4391db4SArnd Bergmann __be32 tmp = addr; 1451b4391db4SArnd Bergmann 1452b4391db4SArnd Bergmann return nla_put_be32(skb, attrtype, tmp); 1453930345eaSJiri Benc } 1454930345eaSJiri Benc 1455930345eaSJiri Benc /** 1456930345eaSJiri Benc * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket 1457930345eaSJiri Benc * buffer 1458930345eaSJiri Benc * @skb: socket buffer to add attribute to 1459930345eaSJiri Benc * @attrtype: attribute type 1460930345eaSJiri Benc * @addr: IPv6 address 1461930345eaSJiri Benc */ 1462930345eaSJiri Benc static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype, 1463930345eaSJiri Benc const struct in6_addr *addr) 1464930345eaSJiri Benc { 1465930345eaSJiri Benc return nla_put(skb, attrtype, sizeof(*addr), addr); 1466930345eaSJiri Benc } 1467930345eaSJiri Benc 1468930345eaSJiri Benc /** 1469bfa83a9eSThomas Graf * nla_get_u32 - return payload of u32 attribute 1470bfa83a9eSThomas Graf * @nla: u32 netlink attribute 1471bfa83a9eSThomas Graf */ 1472b057efd4SPatrick McHardy static inline u32 nla_get_u32(const struct nlattr *nla) 1473bfa83a9eSThomas Graf { 1474bfa83a9eSThomas Graf return *(u32 *) nla_data(nla); 1475bfa83a9eSThomas Graf } 1476bfa83a9eSThomas Graf 1477bfa83a9eSThomas Graf /** 147800012e5bSAl Viro * nla_get_be32 - return payload of __be32 attribute 147900012e5bSAl Viro * @nla: __be32 netlink attribute 148000012e5bSAl Viro */ 1481b057efd4SPatrick McHardy static inline __be32 nla_get_be32(const struct nlattr *nla) 148200012e5bSAl Viro { 148300012e5bSAl Viro return *(__be32 *) nla_data(nla); 148400012e5bSAl Viro } 148500012e5bSAl Viro 148600012e5bSAl Viro /** 1487c648a013SAlexander Aring * nla_get_le32 - return payload of __le32 attribute 1488c648a013SAlexander Aring * @nla: __le32 netlink attribute 1489c648a013SAlexander Aring */ 1490c648a013SAlexander Aring static inline __le32 nla_get_le32(const struct nlattr *nla) 1491c648a013SAlexander Aring { 1492c648a013SAlexander Aring return *(__le32 *) nla_data(nla); 1493c648a013SAlexander Aring } 1494c648a013SAlexander Aring 1495c648a013SAlexander Aring /** 1496bfa83a9eSThomas Graf * nla_get_u16 - return payload of u16 attribute 1497bfa83a9eSThomas Graf * @nla: u16 netlink attribute 1498bfa83a9eSThomas Graf */ 1499b057efd4SPatrick McHardy static inline u16 nla_get_u16(const struct nlattr *nla) 1500bfa83a9eSThomas Graf { 1501bfa83a9eSThomas Graf return *(u16 *) nla_data(nla); 1502bfa83a9eSThomas Graf } 1503bfa83a9eSThomas Graf 1504bfa83a9eSThomas Graf /** 1505838965baSPatrick McHardy * nla_get_be16 - return payload of __be16 attribute 1506838965baSPatrick McHardy * @nla: __be16 netlink attribute 1507838965baSPatrick McHardy */ 1508b057efd4SPatrick McHardy static inline __be16 nla_get_be16(const struct nlattr *nla) 1509838965baSPatrick McHardy { 1510838965baSPatrick McHardy return *(__be16 *) nla_data(nla); 1511838965baSPatrick McHardy } 1512838965baSPatrick McHardy 1513838965baSPatrick McHardy /** 15144a89c256SThomas Graf * nla_get_le16 - return payload of __le16 attribute 15154a89c256SThomas Graf * @nla: __le16 netlink attribute 15164a89c256SThomas Graf */ 1517b057efd4SPatrick McHardy static inline __le16 nla_get_le16(const struct nlattr *nla) 15184a89c256SThomas Graf { 15194a89c256SThomas Graf return *(__le16 *) nla_data(nla); 15204a89c256SThomas Graf } 15214a89c256SThomas Graf 15224a89c256SThomas Graf /** 1523bfa83a9eSThomas Graf * nla_get_u8 - return payload of u8 attribute 1524bfa83a9eSThomas Graf * @nla: u8 netlink attribute 1525bfa83a9eSThomas Graf */ 1526b057efd4SPatrick McHardy static inline u8 nla_get_u8(const struct nlattr *nla) 1527bfa83a9eSThomas Graf { 1528bfa83a9eSThomas Graf return *(u8 *) nla_data(nla); 1529bfa83a9eSThomas Graf } 1530bfa83a9eSThomas Graf 1531bfa83a9eSThomas Graf /** 1532bfa83a9eSThomas Graf * nla_get_u64 - return payload of u64 attribute 1533bfa83a9eSThomas Graf * @nla: u64 netlink attribute 1534bfa83a9eSThomas Graf */ 1535b057efd4SPatrick McHardy static inline u64 nla_get_u64(const struct nlattr *nla) 1536bfa83a9eSThomas Graf { 1537bfa83a9eSThomas Graf u64 tmp; 1538bfa83a9eSThomas Graf 1539bfa83a9eSThomas Graf nla_memcpy(&tmp, nla, sizeof(tmp)); 1540bfa83a9eSThomas Graf 1541bfa83a9eSThomas Graf return tmp; 1542bfa83a9eSThomas Graf } 1543bfa83a9eSThomas Graf 1544bfa83a9eSThomas Graf /** 1545a17c8598SPablo Neira Ayuso * nla_get_be64 - return payload of __be64 attribute 1546a17c8598SPablo Neira Ayuso * @nla: __be64 netlink attribute 1547a17c8598SPablo Neira Ayuso */ 1548a17c8598SPablo Neira Ayuso static inline __be64 nla_get_be64(const struct nlattr *nla) 1549a17c8598SPablo Neira Ayuso { 1550f5d410f2SPablo Neira Ayuso __be64 tmp; 1551f5d410f2SPablo Neira Ayuso 1552f5d410f2SPablo Neira Ayuso nla_memcpy(&tmp, nla, sizeof(tmp)); 1553f5d410f2SPablo Neira Ayuso 1554f5d410f2SPablo Neira Ayuso return tmp; 1555a17c8598SPablo Neira Ayuso } 1556a17c8598SPablo Neira Ayuso 1557a17c8598SPablo Neira Ayuso /** 1558c648a013SAlexander Aring * nla_get_le64 - return payload of __le64 attribute 1559c648a013SAlexander Aring * @nla: __le64 netlink attribute 1560c648a013SAlexander Aring */ 1561c648a013SAlexander Aring static inline __le64 nla_get_le64(const struct nlattr *nla) 1562c648a013SAlexander Aring { 1563c648a013SAlexander Aring return *(__le64 *) nla_data(nla); 1564c648a013SAlexander Aring } 1565c648a013SAlexander Aring 1566c648a013SAlexander Aring /** 15674778e0beSJiri Pirko * nla_get_s32 - return payload of s32 attribute 15684778e0beSJiri Pirko * @nla: s32 netlink attribute 15694778e0beSJiri Pirko */ 15704778e0beSJiri Pirko static inline s32 nla_get_s32(const struct nlattr *nla) 15714778e0beSJiri Pirko { 15724778e0beSJiri Pirko return *(s32 *) nla_data(nla); 15734778e0beSJiri Pirko } 15744778e0beSJiri Pirko 15754778e0beSJiri Pirko /** 15764778e0beSJiri Pirko * nla_get_s16 - return payload of s16 attribute 15774778e0beSJiri Pirko * @nla: s16 netlink attribute 15784778e0beSJiri Pirko */ 15794778e0beSJiri Pirko static inline s16 nla_get_s16(const struct nlattr *nla) 15804778e0beSJiri Pirko { 15814778e0beSJiri Pirko return *(s16 *) nla_data(nla); 15824778e0beSJiri Pirko } 15834778e0beSJiri Pirko 15844778e0beSJiri Pirko /** 15854778e0beSJiri Pirko * nla_get_s8 - return payload of s8 attribute 15864778e0beSJiri Pirko * @nla: s8 netlink attribute 15874778e0beSJiri Pirko */ 15884778e0beSJiri Pirko static inline s8 nla_get_s8(const struct nlattr *nla) 15894778e0beSJiri Pirko { 15904778e0beSJiri Pirko return *(s8 *) nla_data(nla); 15914778e0beSJiri Pirko } 15924778e0beSJiri Pirko 15934778e0beSJiri Pirko /** 15944778e0beSJiri Pirko * nla_get_s64 - return payload of s64 attribute 15954778e0beSJiri Pirko * @nla: s64 netlink attribute 15964778e0beSJiri Pirko */ 15974778e0beSJiri Pirko static inline s64 nla_get_s64(const struct nlattr *nla) 15984778e0beSJiri Pirko { 15994778e0beSJiri Pirko s64 tmp; 16004778e0beSJiri Pirko 16014778e0beSJiri Pirko nla_memcpy(&tmp, nla, sizeof(tmp)); 16024778e0beSJiri Pirko 16034778e0beSJiri Pirko return tmp; 16044778e0beSJiri Pirko } 16054778e0beSJiri Pirko 16064778e0beSJiri Pirko /** 1607bfa83a9eSThomas Graf * nla_get_flag - return payload of flag attribute 1608bfa83a9eSThomas Graf * @nla: flag netlink attribute 1609bfa83a9eSThomas Graf */ 1610b057efd4SPatrick McHardy static inline int nla_get_flag(const struct nlattr *nla) 1611bfa83a9eSThomas Graf { 1612bfa83a9eSThomas Graf return !!nla; 1613bfa83a9eSThomas Graf } 1614bfa83a9eSThomas Graf 1615bfa83a9eSThomas Graf /** 1616bfa83a9eSThomas Graf * nla_get_msecs - return payload of msecs attribute 1617bfa83a9eSThomas Graf * @nla: msecs netlink attribute 1618bfa83a9eSThomas Graf * 1619bfa83a9eSThomas Graf * Returns the number of milliseconds in jiffies. 1620bfa83a9eSThomas Graf */ 1621b057efd4SPatrick McHardy static inline unsigned long nla_get_msecs(const struct nlattr *nla) 1622bfa83a9eSThomas Graf { 1623bfa83a9eSThomas Graf u64 msecs = nla_get_u64(nla); 1624bfa83a9eSThomas Graf 1625bfa83a9eSThomas Graf return msecs_to_jiffies((unsigned long) msecs); 1626bfa83a9eSThomas Graf } 1627bfa83a9eSThomas Graf 1628bfa83a9eSThomas Graf /** 162967b61f6cSJiri Benc * nla_get_in_addr - return payload of IPv4 address attribute 163067b61f6cSJiri Benc * @nla: IPv4 address netlink attribute 163167b61f6cSJiri Benc */ 163267b61f6cSJiri Benc static inline __be32 nla_get_in_addr(const struct nlattr *nla) 163367b61f6cSJiri Benc { 163467b61f6cSJiri Benc return *(__be32 *) nla_data(nla); 163567b61f6cSJiri Benc } 163667b61f6cSJiri Benc 163767b61f6cSJiri Benc /** 163867b61f6cSJiri Benc * nla_get_in6_addr - return payload of IPv6 address attribute 163967b61f6cSJiri Benc * @nla: IPv6 address netlink attribute 164067b61f6cSJiri Benc */ 164167b61f6cSJiri Benc static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla) 164267b61f6cSJiri Benc { 164367b61f6cSJiri Benc struct in6_addr tmp; 164467b61f6cSJiri Benc 164567b61f6cSJiri Benc nla_memcpy(&tmp, nla, sizeof(tmp)); 164667b61f6cSJiri Benc return tmp; 164767b61f6cSJiri Benc } 164867b61f6cSJiri Benc 164967b61f6cSJiri Benc /** 165064c83d83SJamal Hadi Salim * nla_get_bitfield32 - return payload of 32 bitfield attribute 165164c83d83SJamal Hadi Salim * @nla: nla_bitfield32 attribute 165264c83d83SJamal Hadi Salim */ 165364c83d83SJamal Hadi Salim static inline struct nla_bitfield32 nla_get_bitfield32(const struct nlattr *nla) 165464c83d83SJamal Hadi Salim { 165564c83d83SJamal Hadi Salim struct nla_bitfield32 tmp; 165664c83d83SJamal Hadi Salim 165764c83d83SJamal Hadi Salim nla_memcpy(&tmp, nla, sizeof(tmp)); 165864c83d83SJamal Hadi Salim return tmp; 165964c83d83SJamal Hadi Salim } 166064c83d83SJamal Hadi Salim 166164c83d83SJamal Hadi Salim /** 1662b15ca182SThomas Graf * nla_memdup - duplicate attribute memory (kmemdup) 1663b15ca182SThomas Graf * @src: netlink attribute to duplicate from 1664b15ca182SThomas Graf * @gfp: GFP mask 1665b15ca182SThomas Graf */ 1666b15ca182SThomas Graf static inline void *nla_memdup(const struct nlattr *src, gfp_t gfp) 1667b15ca182SThomas Graf { 1668b15ca182SThomas Graf return kmemdup(nla_data(src), nla_len(src), gfp); 1669b15ca182SThomas Graf } 1670b15ca182SThomas Graf 1671b15ca182SThomas Graf /** 1672ae0be8deSMichal Kubecek * nla_nest_start_noflag - Start a new level of nested attributes 1673bfa83a9eSThomas Graf * @skb: socket buffer to add attributes to 1674bfa83a9eSThomas Graf * @attrtype: attribute type of container 1675bfa83a9eSThomas Graf * 1676ae0be8deSMichal Kubecek * This function exists for backward compatibility to use in APIs which never 1677ae0be8deSMichal Kubecek * marked their nest attributes with NLA_F_NESTED flag. New APIs should use 1678ae0be8deSMichal Kubecek * nla_nest_start() which sets the flag. 1679ae0be8deSMichal Kubecek * 1680ae0be8deSMichal Kubecek * Returns the container attribute or NULL on error 1681bfa83a9eSThomas Graf */ 1682ae0be8deSMichal Kubecek static inline struct nlattr *nla_nest_start_noflag(struct sk_buff *skb, 1683ae0be8deSMichal Kubecek int attrtype) 1684bfa83a9eSThomas Graf { 168527a884dcSArnaldo Carvalho de Melo struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); 1686bfa83a9eSThomas Graf 1687bfa83a9eSThomas Graf if (nla_put(skb, attrtype, 0, NULL) < 0) 1688bfa83a9eSThomas Graf return NULL; 1689bfa83a9eSThomas Graf 1690bfa83a9eSThomas Graf return start; 1691bfa83a9eSThomas Graf } 1692bfa83a9eSThomas Graf 1693bfa83a9eSThomas Graf /** 1694ae0be8deSMichal Kubecek * nla_nest_start - Start a new level of nested attributes, with NLA_F_NESTED 1695ae0be8deSMichal Kubecek * @skb: socket buffer to add attributes to 1696ae0be8deSMichal Kubecek * @attrtype: attribute type of container 1697ae0be8deSMichal Kubecek * 1698ae0be8deSMichal Kubecek * Unlike nla_nest_start_noflag(), mark the nest attribute with NLA_F_NESTED 1699ae0be8deSMichal Kubecek * flag. This is the preferred function to use in new code. 1700ae0be8deSMichal Kubecek * 1701ae0be8deSMichal Kubecek * Returns the container attribute or NULL on error 1702ae0be8deSMichal Kubecek */ 1703ae0be8deSMichal Kubecek static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) 1704ae0be8deSMichal Kubecek { 1705ae0be8deSMichal Kubecek return nla_nest_start_noflag(skb, attrtype | NLA_F_NESTED); 1706ae0be8deSMichal Kubecek } 1707ae0be8deSMichal Kubecek 1708ae0be8deSMichal Kubecek /** 1709bfa83a9eSThomas Graf * nla_nest_end - Finalize nesting of attributes 1710d1ec3b77SPierre Ynard * @skb: socket buffer the attributes are stored in 1711bfa83a9eSThomas Graf * @start: container attribute 1712bfa83a9eSThomas Graf * 1713bfa83a9eSThomas Graf * Corrects the container attribute header to include the all 1714bfa83a9eSThomas Graf * appeneded attributes. 1715bfa83a9eSThomas Graf * 1716bfa83a9eSThomas Graf * Returns the total data length of the skb. 1717bfa83a9eSThomas Graf */ 1718bfa83a9eSThomas Graf static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) 1719bfa83a9eSThomas Graf { 172027a884dcSArnaldo Carvalho de Melo start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; 1721bfa83a9eSThomas Graf return skb->len; 1722bfa83a9eSThomas Graf } 1723bfa83a9eSThomas Graf 1724bfa83a9eSThomas Graf /** 1725bfa83a9eSThomas Graf * nla_nest_cancel - Cancel nesting of attributes 1726bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 1727bfa83a9eSThomas Graf * @start: container attribute 1728bfa83a9eSThomas Graf * 1729bfa83a9eSThomas Graf * Removes the container attribute and including all nested 1730bc3ed28cSThomas Graf * attributes. Returns -EMSGSIZE 1731bfa83a9eSThomas Graf */ 1732bc3ed28cSThomas Graf static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) 1733bfa83a9eSThomas Graf { 1734bc3ed28cSThomas Graf nlmsg_trim(skb, start); 1735bfa83a9eSThomas Graf } 1736bfa83a9eSThomas Graf 1737bfa83a9eSThomas Graf /** 173832d5109aSMichal Kubecek * __nla_validate_nested - Validate a stream of nested attributes 17394fe5d5c0SPaul Moore * @start: container attribute 17404fe5d5c0SPaul Moore * @maxtype: maximum attribute type to be expected 17414fe5d5c0SPaul Moore * @policy: validation policy 17428cb08174SJohannes Berg * @validate: validation strictness 1743fceb6435SJohannes Berg * @extack: extended ACK report struct 17444fe5d5c0SPaul Moore * 17454fe5d5c0SPaul Moore * Validates all attributes in the nested attribute stream against the 17464fe5d5c0SPaul Moore * specified policy. Attributes with a type exceeding maxtype will be 17474fe5d5c0SPaul Moore * ignored. See documenation of struct nla_policy for more details. 17484fe5d5c0SPaul Moore * 17494fe5d5c0SPaul Moore * Returns 0 on success or a negative error code. 17504fe5d5c0SPaul Moore */ 17518cb08174SJohannes Berg static inline int __nla_validate_nested(const struct nlattr *start, int maxtype, 17528cb08174SJohannes Berg const struct nla_policy *policy, 17538cb08174SJohannes Berg unsigned int validate, 17548cb08174SJohannes Berg struct netlink_ext_ack *extack) 17558cb08174SJohannes Berg { 17568cb08174SJohannes Berg return __nla_validate(nla_data(start), nla_len(start), maxtype, policy, 17578cb08174SJohannes Berg validate, extack); 17588cb08174SJohannes Berg } 17598cb08174SJohannes Berg 17608cb08174SJohannes Berg static inline int 176132d5109aSMichal Kubecek nla_validate_nested(const struct nlattr *start, int maxtype, 1762901bb989SJohannes Berg const struct nla_policy *policy, 1763901bb989SJohannes Berg struct netlink_ext_ack *extack) 1764901bb989SJohannes Berg { 1765901bb989SJohannes Berg return __nla_validate_nested(start, maxtype, policy, 1766901bb989SJohannes Berg NL_VALIDATE_STRICT, extack); 1767901bb989SJohannes Berg } 1768901bb989SJohannes Berg 1769901bb989SJohannes Berg static inline int 17708cb08174SJohannes Berg nla_validate_nested_deprecated(const struct nlattr *start, int maxtype, 1771fceb6435SJohannes Berg const struct nla_policy *policy, 1772fceb6435SJohannes Berg struct netlink_ext_ack *extack) 17734fe5d5c0SPaul Moore { 17748cb08174SJohannes Berg return __nla_validate_nested(start, maxtype, policy, 17758cb08174SJohannes Berg NL_VALIDATE_LIBERAL, extack); 17764fe5d5c0SPaul Moore } 17774fe5d5c0SPaul Moore 17784fe5d5c0SPaul Moore /** 1779089bf1a6SNicolas Dichtel * nla_need_padding_for_64bit - test 64-bit alignment of the next attribute 1780089bf1a6SNicolas Dichtel * @skb: socket buffer the message is stored in 1781089bf1a6SNicolas Dichtel * 1782089bf1a6SNicolas Dichtel * Return true if padding is needed to align the next attribute (nla_data()) to 1783089bf1a6SNicolas Dichtel * a 64-bit aligned area. 1784089bf1a6SNicolas Dichtel */ 1785089bf1a6SNicolas Dichtel static inline bool nla_need_padding_for_64bit(struct sk_buff *skb) 1786089bf1a6SNicolas Dichtel { 1787089bf1a6SNicolas Dichtel #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 1788089bf1a6SNicolas Dichtel /* The nlattr header is 4 bytes in size, that's why we test 1789089bf1a6SNicolas Dichtel * if the skb->data _is_ aligned. A NOP attribute, plus 1790089bf1a6SNicolas Dichtel * nlattr header for next attribute, will make nla_data() 1791089bf1a6SNicolas Dichtel * 8-byte aligned. 1792089bf1a6SNicolas Dichtel */ 1793089bf1a6SNicolas Dichtel if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8)) 1794089bf1a6SNicolas Dichtel return true; 1795089bf1a6SNicolas Dichtel #endif 1796089bf1a6SNicolas Dichtel return false; 1797089bf1a6SNicolas Dichtel } 1798089bf1a6SNicolas Dichtel 1799089bf1a6SNicolas Dichtel /** 180035c58459SDavid S. Miller * nla_align_64bit - 64-bit align the nla_data() of next attribute 180135c58459SDavid S. Miller * @skb: socket buffer the message is stored in 180235c58459SDavid S. Miller * @padattr: attribute type for the padding 180335c58459SDavid S. Miller * 180435c58459SDavid S. Miller * Conditionally emit a padding netlink attribute in order to make 180535c58459SDavid S. Miller * the next attribute we emit have a 64-bit aligned nla_data() area. 180635c58459SDavid S. Miller * This will only be done in architectures which do not have 1807cca1d815SEric Dumazet * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined. 180835c58459SDavid S. Miller * 180935c58459SDavid S. Miller * Returns zero on success or a negative error code. 181035c58459SDavid S. Miller */ 181135c58459SDavid S. Miller static inline int nla_align_64bit(struct sk_buff *skb, int padattr) 181235c58459SDavid S. Miller { 1813089bf1a6SNicolas Dichtel if (nla_need_padding_for_64bit(skb) && 1814cca1d815SEric Dumazet !nla_reserve(skb, padattr, 0)) 181535c58459SDavid S. Miller return -EMSGSIZE; 1816089bf1a6SNicolas Dichtel 181735c58459SDavid S. Miller return 0; 181835c58459SDavid S. Miller } 181935c58459SDavid S. Miller 182035c58459SDavid S. Miller /** 182135c58459SDavid S. Miller * nla_total_size_64bit - total length of attribute including padding 182235c58459SDavid S. Miller * @payload: length of payload 182335c58459SDavid S. Miller */ 182435c58459SDavid S. Miller static inline int nla_total_size_64bit(int payload) 182535c58459SDavid S. Miller { 182635c58459SDavid S. Miller return NLA_ALIGN(nla_attr_size(payload)) 1827cca1d815SEric Dumazet #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 182835c58459SDavid S. Miller + NLA_ALIGN(nla_attr_size(0)) 182935c58459SDavid S. Miller #endif 183035c58459SDavid S. Miller ; 183135c58459SDavid S. Miller } 183235c58459SDavid S. Miller 183335c58459SDavid S. Miller /** 1834bfa83a9eSThomas Graf * nla_for_each_attr - iterate over a stream of attributes 1835bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 1836bfa83a9eSThomas Graf * @head: head of attribute stream 1837bfa83a9eSThomas Graf * @len: length of attribute stream 1838bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 1839bfa83a9eSThomas Graf */ 1840bfa83a9eSThomas Graf #define nla_for_each_attr(pos, head, len, rem) \ 1841bfa83a9eSThomas Graf for (pos = head, rem = len; \ 1842bfa83a9eSThomas Graf nla_ok(pos, rem); \ 1843bfa83a9eSThomas Graf pos = nla_next(pos, &(rem))) 1844bfa83a9eSThomas Graf 1845fe4944e5SThomas Graf /** 1846fe4944e5SThomas Graf * nla_for_each_nested - iterate over nested attributes 1847fe4944e5SThomas Graf * @pos: loop counter, set to current attribute 1848fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 1849fe4944e5SThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 1850fe4944e5SThomas Graf */ 1851fe4944e5SThomas Graf #define nla_for_each_nested(pos, nla, rem) \ 1852fe4944e5SThomas Graf nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) 1853fe4944e5SThomas Graf 1854941d8ebcSSimon Horman /** 1855941d8ebcSSimon Horman * nla_is_last - Test if attribute is last in stream 1856941d8ebcSSimon Horman * @nla: attribute to test 1857941d8ebcSSimon Horman * @rem: bytes remaining in stream 1858941d8ebcSSimon Horman */ 1859941d8ebcSSimon Horman static inline bool nla_is_last(const struct nlattr *nla, int rem) 1860941d8ebcSSimon Horman { 1861941d8ebcSSimon Horman return nla->nla_len == rem; 1862941d8ebcSSimon Horman } 1863941d8ebcSSimon Horman 1864bfa83a9eSThomas Graf #endif 1865