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 156bfa83a9eSThomas Graf * nla_parse_nested() parse nested attribuets 157bfa83a9eSThomas Graf * nla_for_each_attr() loop over all attributes 15822acb19aSPaul Moore * nla_for_each_nested() loop over the nested attributes 159bfa83a9eSThomas Graf *========================================================================= 160bfa83a9eSThomas Graf */ 161bfa83a9eSThomas Graf 162bfa83a9eSThomas Graf /** 163bfa83a9eSThomas Graf * Standard attribute types to specify validation policy 164bfa83a9eSThomas Graf */ 165bfa83a9eSThomas Graf enum { 166bfa83a9eSThomas Graf NLA_UNSPEC, 167bfa83a9eSThomas Graf NLA_U8, 168bfa83a9eSThomas Graf NLA_U16, 169bfa83a9eSThomas Graf NLA_U32, 170bfa83a9eSThomas Graf NLA_U64, 171bfa83a9eSThomas Graf NLA_STRING, 172bfa83a9eSThomas Graf NLA_FLAG, 173bfa83a9eSThomas Graf NLA_MSECS, 174bfa83a9eSThomas Graf NLA_NESTED, 1751501d135SJohannes Berg NLA_NESTED_ARRAY, 176a5531a5dSThomas Graf NLA_NUL_STRING, 177d30045a0SJohannes Berg NLA_BINARY, 1784778e0beSJiri Pirko NLA_S8, 1794778e0beSJiri Pirko NLA_S16, 1804778e0beSJiri Pirko NLA_S32, 1814778e0beSJiri Pirko NLA_S64, 18264c83d83SJamal Hadi Salim NLA_BITFIELD32, 183568b742aSJohannes Berg NLA_REJECT, 184b60b87fcSJohannes Berg NLA_EXACT_LEN, 185b60b87fcSJohannes Berg NLA_EXACT_LEN_WARN, 186bfa83a9eSThomas Graf __NLA_TYPE_MAX, 187bfa83a9eSThomas Graf }; 188bfa83a9eSThomas Graf 189bfa83a9eSThomas Graf #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) 190bfa83a9eSThomas Graf 1913e48be05SJohannes Berg enum nla_policy_validation { 1923e48be05SJohannes Berg NLA_VALIDATE_NONE, 1933e48be05SJohannes Berg NLA_VALIDATE_RANGE, 1943e48be05SJohannes Berg NLA_VALIDATE_MIN, 1953e48be05SJohannes Berg NLA_VALIDATE_MAX, 1963e48be05SJohannes Berg }; 1973e48be05SJohannes Berg 198bfa83a9eSThomas Graf /** 199bfa83a9eSThomas Graf * struct nla_policy - attribute validation policy 200bfa83a9eSThomas Graf * @type: Type of attribute or NLA_UNSPEC 2013e48be05SJohannes Berg * @validation_type: type of attribute validation done in addition to 2023e48be05SJohannes Berg * type-specific validation (e.g. range), see 2033e48be05SJohannes Berg * &enum nla_policy_validation 204a5531a5dSThomas Graf * @len: Type specific length of payload 205bfa83a9eSThomas Graf * 206bfa83a9eSThomas Graf * Policies are defined as arrays of this struct, the array must be 207bfa83a9eSThomas Graf * accessible by attribute type up to the highest identifier to be expected. 208bfa83a9eSThomas Graf * 209a5531a5dSThomas Graf * Meaning of `len' field: 210a5531a5dSThomas Graf * NLA_STRING Maximum length of string 211a5531a5dSThomas Graf * NLA_NUL_STRING Maximum length of string (excluding NUL) 212a5531a5dSThomas Graf * NLA_FLAG Unused 213d30045a0SJohannes Berg * NLA_BINARY Maximum length of attribute payload 2141501d135SJohannes Berg * NLA_NESTED, 2151501d135SJohannes Berg * NLA_NESTED_ARRAY Length verification is done by checking len of 2169a659a35SJohannes Berg * nested header (or empty); len field is used if 2179a659a35SJohannes Berg * validation_data is also used, for the max attr 2189a659a35SJohannes Berg * number in the nested policy. 2194b6cc728SJohannes Berg * NLA_U8, NLA_U16, 2204b6cc728SJohannes Berg * NLA_U32, NLA_U64, 2214778e0beSJiri Pirko * NLA_S8, NLA_S16, 2224778e0beSJiri Pirko * NLA_S32, NLA_S64, 2234b6cc728SJohannes Berg * NLA_MSECS Leaving the length field zero will verify the 2244b6cc728SJohannes Berg * given type fits, using it verifies minimum length 2254b6cc728SJohannes Berg * just like "All other" 226568b742aSJohannes Berg * NLA_BITFIELD32 Unused 227568b742aSJohannes Berg * NLA_REJECT Unused 228b60b87fcSJohannes Berg * NLA_EXACT_LEN Attribute must have exactly this length, otherwise 229b60b87fcSJohannes Berg * it is rejected. 230b60b87fcSJohannes Berg * NLA_EXACT_LEN_WARN Attribute should have exactly this length, a warning 231b60b87fcSJohannes Berg * is logged if it is longer, shorter is rejected. 2324b6cc728SJohannes Berg * All other Minimum length of attribute payload 233a5531a5dSThomas Graf * 234568b742aSJohannes Berg * Meaning of `validation_data' field: 235568b742aSJohannes Berg * NLA_BITFIELD32 This is a 32-bit bitmap/bitselector attribute and 236568b742aSJohannes Berg * validation data must point to a u32 value of valid 237568b742aSJohannes Berg * flags 238568b742aSJohannes Berg * NLA_REJECT This attribute is always rejected and validation data 239568b742aSJohannes Berg * may point to a string to report as the error instead 240568b742aSJohannes Berg * of the generic one in extended ACK. 2419a659a35SJohannes Berg * NLA_NESTED Points to a nested policy to validate, must also set 2429a659a35SJohannes Berg * `len' to the max attribute number. 2439a659a35SJohannes Berg * Note that nla_parse() will validate, but of course not 2449a659a35SJohannes Berg * parse, the nested sub-policies. 2451501d135SJohannes Berg * NLA_NESTED_ARRAY Points to a nested policy to validate, must also set 2461501d135SJohannes Berg * `len' to the max attribute number. The difference to 2471501d135SJohannes Berg * NLA_NESTED is the structure - NLA_NESTED has the 2481501d135SJohannes Berg * nested attributes directly inside, while an array has 2491501d135SJohannes Berg * the nested attributes at another level down and the 2501501d135SJohannes Berg * attributes directly in the nesting don't matter. 2513e48be05SJohannes Berg * All other Unused - but note that it's a union 2523e48be05SJohannes Berg * 2533e48be05SJohannes Berg * Meaning of `min' and `max' fields, use via NLA_POLICY_MIN, NLA_POLICY_MAX 2543e48be05SJohannes Berg * and NLA_POLICY_RANGE: 2553e48be05SJohannes Berg * NLA_U8, 2563e48be05SJohannes Berg * NLA_U16, 2573e48be05SJohannes Berg * NLA_U32, 2583e48be05SJohannes Berg * NLA_U64, 2593e48be05SJohannes Berg * NLA_S8, 2603e48be05SJohannes Berg * NLA_S16, 2613e48be05SJohannes Berg * NLA_S32, 2623e48be05SJohannes Berg * NLA_S64 These are used depending on the validation_type 2633e48be05SJohannes Berg * field, if that is min/max/range then the minimum, 2643e48be05SJohannes Berg * maximum and both are used (respectively) to check 2653e48be05SJohannes Berg * the value of the integer attribute. 2663e48be05SJohannes Berg * Note that in the interest of code simplicity and 2673e48be05SJohannes Berg * struct size both limits are s16, so you cannot 2683e48be05SJohannes Berg * enforce a range that doesn't fall within the range 2693e48be05SJohannes Berg * of s16 - do that as usual in the code instead. 2703e48be05SJohannes Berg * All other Unused - but note that it's a union 271568b742aSJohannes Berg * 272bfa83a9eSThomas Graf * Example: 273b54452b0SAlexey Dobriyan * static const struct nla_policy my_policy[ATTR_MAX+1] = { 274bfa83a9eSThomas Graf * [ATTR_FOO] = { .type = NLA_U16 }, 275d30045a0SJohannes Berg * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ }, 276a5531a5dSThomas Graf * [ATTR_BAZ] = { .len = sizeof(struct mystruct) }, 27764c83d83SJamal Hadi Salim * [ATTR_GOO] = { .type = NLA_BITFIELD32, .validation_data = &myvalidflags }, 278bfa83a9eSThomas Graf * }; 279bfa83a9eSThomas Graf */ 280bfa83a9eSThomas Graf struct nla_policy { 2813e48be05SJohannes Berg u8 type; 2823e48be05SJohannes Berg u8 validation_type; 283a5531a5dSThomas Graf u16 len; 2843e48be05SJohannes Berg union { 28548fde90aSJohannes Berg const void *validation_data; 2863e48be05SJohannes Berg struct { 2873e48be05SJohannes Berg s16 min, max; 2883e48be05SJohannes Berg }; 2893e48be05SJohannes Berg }; 290bfa83a9eSThomas Graf }; 291bfa83a9eSThomas Graf 292b60b87fcSJohannes Berg #define NLA_POLICY_EXACT_LEN(_len) { .type = NLA_EXACT_LEN, .len = _len } 293b60b87fcSJohannes Berg #define NLA_POLICY_EXACT_LEN_WARN(_len) { .type = NLA_EXACT_LEN_WARN, \ 294b60b87fcSJohannes Berg .len = _len } 295b60b87fcSJohannes Berg 296b60b87fcSJohannes Berg #define NLA_POLICY_ETH_ADDR NLA_POLICY_EXACT_LEN(ETH_ALEN) 297b60b87fcSJohannes Berg #define NLA_POLICY_ETH_ADDR_COMPAT NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN) 298b60b87fcSJohannes Berg 2999a659a35SJohannes Berg #define NLA_POLICY_NESTED(maxattr, policy) \ 3009a659a35SJohannes Berg { .type = NLA_NESTED, .validation_data = policy, .len = maxattr } 3011501d135SJohannes Berg #define NLA_POLICY_NESTED_ARRAY(maxattr, policy) \ 3021501d135SJohannes Berg { .type = NLA_NESTED_ARRAY, .validation_data = policy, .len = maxattr } 3039a659a35SJohannes Berg 3043e48be05SJohannes Berg #define __NLA_ENSURE(condition) (sizeof(char[1 - 2*!(condition)]) - 1) 3053e48be05SJohannes Berg #define NLA_ENSURE_INT_TYPE(tp) \ 3063e48be05SJohannes Berg (__NLA_ENSURE(tp == NLA_S8 || tp == NLA_U8 || \ 3073e48be05SJohannes Berg tp == NLA_S16 || tp == NLA_U16 || \ 3083e48be05SJohannes Berg tp == NLA_S32 || tp == NLA_U32 || \ 3093e48be05SJohannes Berg tp == NLA_S64 || tp == NLA_U64) + tp) 3103e48be05SJohannes Berg 3113e48be05SJohannes Berg #define NLA_POLICY_RANGE(tp, _min, _max) { \ 3123e48be05SJohannes Berg .type = NLA_ENSURE_INT_TYPE(tp), \ 3133e48be05SJohannes Berg .validation_type = NLA_VALIDATE_RANGE, \ 3143e48be05SJohannes Berg .min = _min, \ 3153e48be05SJohannes Berg .max = _max \ 3163e48be05SJohannes Berg } 3173e48be05SJohannes Berg 3183e48be05SJohannes Berg #define NLA_POLICY_MIN(tp, _min) { \ 3193e48be05SJohannes Berg .type = NLA_ENSURE_INT_TYPE(tp), \ 3203e48be05SJohannes Berg .validation_type = NLA_VALIDATE_MIN, \ 3213e48be05SJohannes Berg .min = _min, \ 3223e48be05SJohannes Berg } 3233e48be05SJohannes Berg 3243e48be05SJohannes Berg #define NLA_POLICY_MAX(tp, _max) { \ 3253e48be05SJohannes Berg .type = NLA_ENSURE_INT_TYPE(tp), \ 3263e48be05SJohannes Berg .validation_type = NLA_VALIDATE_MAX, \ 3273e48be05SJohannes Berg .max = _max, \ 3283e48be05SJohannes Berg } 3293e48be05SJohannes Berg 3304e902c57SThomas Graf /** 3314e902c57SThomas Graf * struct nl_info - netlink source information 3324e902c57SThomas Graf * @nlh: Netlink message header of original request 33315e47304SEric W. Biederman * @portid: Netlink PORTID of requesting application 3344e902c57SThomas Graf */ 3354e902c57SThomas Graf struct nl_info { 3364e902c57SThomas Graf struct nlmsghdr *nlh; 3374d1169c1SDenis V. Lunev struct net *nl_net; 33815e47304SEric W. Biederman u32 portid; 3393b1137feSDavid Ahern bool skip_notify; 3404e902c57SThomas Graf }; 3414e902c57SThomas Graf 3424f69053bSJoe Perches int netlink_rcv_skb(struct sk_buff *skb, 3432d4bc933SJohannes Berg int (*cb)(struct sk_buff *, struct nlmsghdr *, 3442d4bc933SJohannes Berg struct netlink_ext_ack *)); 3454f69053bSJoe Perches int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, 3464f69053bSJoe Perches unsigned int group, int report, gfp_t flags); 34782ace47aSThomas Graf 3484f69053bSJoe Perches int nla_validate(const struct nlattr *head, int len, int maxtype, 349fceb6435SJohannes Berg const struct nla_policy *policy, 350fceb6435SJohannes Berg struct netlink_ext_ack *extack); 3514f69053bSJoe Perches int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head, 352fceb6435SJohannes Berg int len, const struct nla_policy *policy, 353fceb6435SJohannes Berg struct netlink_ext_ack *extack); 3544f69053bSJoe Perches int nla_policy_len(const struct nla_policy *, int); 3554f69053bSJoe Perches struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype); 3564f69053bSJoe Perches size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize); 3572cf0c8b3SPhil Sutter char *nla_strdup(const struct nlattr *nla, gfp_t flags); 3584f69053bSJoe Perches int nla_memcpy(void *dest, const struct nlattr *src, int count); 3594f69053bSJoe Perches int nla_memcmp(const struct nlattr *nla, const void *data, size_t size); 3604f69053bSJoe Perches int nla_strcmp(const struct nlattr *nla, const char *str); 3614f69053bSJoe Perches struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); 362089bf1a6SNicolas Dichtel struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, 363089bf1a6SNicolas Dichtel int attrlen, int padattr); 3644f69053bSJoe Perches void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 3654f69053bSJoe Perches struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); 366089bf1a6SNicolas Dichtel struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, 367089bf1a6SNicolas Dichtel int attrlen, int padattr); 3684f69053bSJoe Perches void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen); 3694f69053bSJoe Perches void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, 370fe4944e5SThomas Graf const void *data); 371089bf1a6SNicolas Dichtel void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, 372089bf1a6SNicolas Dichtel const void *data, int padattr); 3734f69053bSJoe Perches void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); 3744f69053bSJoe Perches int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data); 375089bf1a6SNicolas Dichtel int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, 376089bf1a6SNicolas Dichtel const void *data, int padattr); 3774f69053bSJoe Perches int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); 3784f69053bSJoe Perches int nla_append(struct sk_buff *skb, int attrlen, const void *data); 379bfa83a9eSThomas Graf 380bfa83a9eSThomas Graf /************************************************************************** 381bfa83a9eSThomas Graf * Netlink Messages 382bfa83a9eSThomas Graf **************************************************************************/ 383bfa83a9eSThomas Graf 384bfa83a9eSThomas Graf /** 385bfa83a9eSThomas Graf * nlmsg_msg_size - length of netlink message not including padding 386bfa83a9eSThomas Graf * @payload: length of message payload 387bfa83a9eSThomas Graf */ 388bfa83a9eSThomas Graf static inline int nlmsg_msg_size(int payload) 389bfa83a9eSThomas Graf { 390bfa83a9eSThomas Graf return NLMSG_HDRLEN + payload; 391bfa83a9eSThomas Graf } 392bfa83a9eSThomas Graf 393bfa83a9eSThomas Graf /** 394bfa83a9eSThomas Graf * nlmsg_total_size - length of netlink message including padding 395bfa83a9eSThomas Graf * @payload: length of message payload 396bfa83a9eSThomas Graf */ 397bfa83a9eSThomas Graf static inline int nlmsg_total_size(int payload) 398bfa83a9eSThomas Graf { 399bfa83a9eSThomas Graf return NLMSG_ALIGN(nlmsg_msg_size(payload)); 400bfa83a9eSThomas Graf } 401bfa83a9eSThomas Graf 402bfa83a9eSThomas Graf /** 403bfa83a9eSThomas Graf * nlmsg_padlen - length of padding at the message's tail 404bfa83a9eSThomas Graf * @payload: length of message payload 405bfa83a9eSThomas Graf */ 406bfa83a9eSThomas Graf static inline int nlmsg_padlen(int payload) 407bfa83a9eSThomas Graf { 408bfa83a9eSThomas Graf return nlmsg_total_size(payload) - nlmsg_msg_size(payload); 409bfa83a9eSThomas Graf } 410bfa83a9eSThomas Graf 411bfa83a9eSThomas Graf /** 412bfa83a9eSThomas Graf * nlmsg_data - head of message payload 41370f23fd6SJustin P. Mattock * @nlh: netlink message header 414bfa83a9eSThomas Graf */ 415bfa83a9eSThomas Graf static inline void *nlmsg_data(const struct nlmsghdr *nlh) 416bfa83a9eSThomas Graf { 417bfa83a9eSThomas Graf return (unsigned char *) nlh + NLMSG_HDRLEN; 418bfa83a9eSThomas Graf } 419bfa83a9eSThomas Graf 420bfa83a9eSThomas Graf /** 421bfa83a9eSThomas Graf * nlmsg_len - length of message payload 422bfa83a9eSThomas Graf * @nlh: netlink message header 423bfa83a9eSThomas Graf */ 424bfa83a9eSThomas Graf static inline int nlmsg_len(const struct nlmsghdr *nlh) 425bfa83a9eSThomas Graf { 426bfa83a9eSThomas Graf return nlh->nlmsg_len - NLMSG_HDRLEN; 427bfa83a9eSThomas Graf } 428bfa83a9eSThomas Graf 429bfa83a9eSThomas Graf /** 430bfa83a9eSThomas Graf * nlmsg_attrdata - head of attributes data 431bfa83a9eSThomas Graf * @nlh: netlink message header 432bfa83a9eSThomas Graf * @hdrlen: length of family specific header 433bfa83a9eSThomas Graf */ 434bfa83a9eSThomas Graf static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, 435bfa83a9eSThomas Graf int hdrlen) 436bfa83a9eSThomas Graf { 437bfa83a9eSThomas Graf unsigned char *data = nlmsg_data(nlh); 438bfa83a9eSThomas Graf return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); 439bfa83a9eSThomas Graf } 440bfa83a9eSThomas Graf 441bfa83a9eSThomas Graf /** 442bfa83a9eSThomas Graf * nlmsg_attrlen - length of attributes data 443bfa83a9eSThomas Graf * @nlh: netlink message header 444bfa83a9eSThomas Graf * @hdrlen: length of family specific header 445bfa83a9eSThomas Graf */ 446bfa83a9eSThomas Graf static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) 447bfa83a9eSThomas Graf { 448bfa83a9eSThomas Graf return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); 449bfa83a9eSThomas Graf } 450bfa83a9eSThomas Graf 451bfa83a9eSThomas Graf /** 452bfa83a9eSThomas Graf * nlmsg_ok - check if the netlink message fits into the remaining bytes 453bfa83a9eSThomas Graf * @nlh: netlink message header 454bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 455bfa83a9eSThomas Graf */ 456bfa83a9eSThomas Graf static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) 457bfa83a9eSThomas Graf { 458619e803dSVegard Nossum return (remaining >= (int) sizeof(struct nlmsghdr) && 459bfa83a9eSThomas Graf nlh->nlmsg_len >= sizeof(struct nlmsghdr) && 460bfa83a9eSThomas Graf nlh->nlmsg_len <= remaining); 461bfa83a9eSThomas Graf } 462bfa83a9eSThomas Graf 463bfa83a9eSThomas Graf /** 464bfa83a9eSThomas Graf * nlmsg_next - next netlink message in message stream 465bfa83a9eSThomas Graf * @nlh: netlink message header 466bfa83a9eSThomas Graf * @remaining: number of bytes remaining in message stream 467bfa83a9eSThomas Graf * 468bfa83a9eSThomas Graf * Returns the next netlink message in the message stream and 469bfa83a9eSThomas Graf * decrements remaining by the size of the current message. 470bfa83a9eSThomas Graf */ 4713654654fSJan Engelhardt static inline struct nlmsghdr * 4723654654fSJan Engelhardt nlmsg_next(const struct nlmsghdr *nlh, int *remaining) 473bfa83a9eSThomas Graf { 474bfa83a9eSThomas Graf int totlen = NLMSG_ALIGN(nlh->nlmsg_len); 475bfa83a9eSThomas Graf 476bfa83a9eSThomas Graf *remaining -= totlen; 477bfa83a9eSThomas Graf 478bfa83a9eSThomas Graf return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); 479bfa83a9eSThomas Graf } 480bfa83a9eSThomas Graf 481bfa83a9eSThomas Graf /** 482bfa83a9eSThomas Graf * nlmsg_parse - parse attributes of a netlink message 483bfa83a9eSThomas Graf * @nlh: netlink message header 484bfa83a9eSThomas Graf * @hdrlen: length of family specific header 485bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 486bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 487bfa83a9eSThomas Graf * @policy: validation policy 488fceb6435SJohannes Berg * @extack: extended ACK report struct 489bfa83a9eSThomas Graf * 490bfa83a9eSThomas Graf * See nla_parse() 491bfa83a9eSThomas Graf */ 4923a6c2b41SPatrick McHardy static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, 493bfa83a9eSThomas Graf struct nlattr *tb[], int maxtype, 494fceb6435SJohannes Berg const struct nla_policy *policy, 495fceb6435SJohannes Berg struct netlink_ext_ack *extack) 496bfa83a9eSThomas Graf { 497bfa83a9eSThomas Graf if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) 498bfa83a9eSThomas Graf return -EINVAL; 499bfa83a9eSThomas Graf 500bfa83a9eSThomas Graf return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), 501fceb6435SJohannes Berg nlmsg_attrlen(nlh, hdrlen), policy, extack); 502bfa83a9eSThomas Graf } 503bfa83a9eSThomas Graf 504bfa83a9eSThomas Graf /** 505bfa83a9eSThomas Graf * nlmsg_find_attr - find a specific attribute in a netlink message 506bfa83a9eSThomas Graf * @nlh: netlink message header 507bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 508bfa83a9eSThomas Graf * @attrtype: type of attribute to look for 509bfa83a9eSThomas Graf * 510bfa83a9eSThomas Graf * Returns the first attribute which matches the specified type. 511bfa83a9eSThomas Graf */ 5126b8c92baSNelson Elhage static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, 513bfa83a9eSThomas Graf int hdrlen, int attrtype) 514bfa83a9eSThomas Graf { 515bfa83a9eSThomas Graf return nla_find(nlmsg_attrdata(nlh, hdrlen), 516bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), attrtype); 517bfa83a9eSThomas Graf } 518bfa83a9eSThomas Graf 519bfa83a9eSThomas Graf /** 520bfa83a9eSThomas Graf * nlmsg_validate - validate a netlink message including attributes 521bfa83a9eSThomas Graf * @nlh: netlinket message header 522bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 523bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 524bfa83a9eSThomas Graf * @policy: validation policy 525fceb6435SJohannes Berg * @extack: extended ACK report struct 526bfa83a9eSThomas Graf */ 5273654654fSJan Engelhardt static inline int nlmsg_validate(const struct nlmsghdr *nlh, 5283654654fSJan Engelhardt int hdrlen, int maxtype, 529fceb6435SJohannes Berg const struct nla_policy *policy, 530fceb6435SJohannes Berg struct netlink_ext_ack *extack) 531bfa83a9eSThomas Graf { 532bfa83a9eSThomas Graf if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) 533bfa83a9eSThomas Graf return -EINVAL; 534bfa83a9eSThomas Graf 535bfa83a9eSThomas Graf return nla_validate(nlmsg_attrdata(nlh, hdrlen), 536fceb6435SJohannes Berg nlmsg_attrlen(nlh, hdrlen), maxtype, policy, 537fceb6435SJohannes Berg extack); 538bfa83a9eSThomas Graf } 539bfa83a9eSThomas Graf 540bfa83a9eSThomas Graf /** 54197676b6bSThomas Graf * nlmsg_report - need to report back to application? 54297676b6bSThomas Graf * @nlh: netlink message header 54397676b6bSThomas Graf * 54497676b6bSThomas Graf * Returns 1 if a report back to the application is requested. 54597676b6bSThomas Graf */ 5463a6c2b41SPatrick McHardy static inline int nlmsg_report(const struct nlmsghdr *nlh) 54797676b6bSThomas Graf { 54897676b6bSThomas Graf return !!(nlh->nlmsg_flags & NLM_F_ECHO); 54997676b6bSThomas Graf } 55097676b6bSThomas Graf 55197676b6bSThomas Graf /** 552bfa83a9eSThomas Graf * nlmsg_for_each_attr - iterate over a stream of attributes 553bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 554bfa83a9eSThomas Graf * @nlh: netlink message header 555bfa83a9eSThomas Graf * @hdrlen: length of familiy specific header 556bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 557bfa83a9eSThomas Graf */ 558bfa83a9eSThomas Graf #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ 559bfa83a9eSThomas Graf nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ 560bfa83a9eSThomas Graf nlmsg_attrlen(nlh, hdrlen), rem) 561bfa83a9eSThomas Graf 562bfa83a9eSThomas Graf /** 563bfa83a9eSThomas Graf * nlmsg_put - Add a new netlink message to an skb 564bfa83a9eSThomas Graf * @skb: socket buffer to store message in 5652c6ba4b1SNicolas Dichtel * @portid: netlink PORTID of requesting application 566bfa83a9eSThomas Graf * @seq: sequence number of message 567bfa83a9eSThomas Graf * @type: message type 568bfa83a9eSThomas Graf * @payload: length of message payload 569bfa83a9eSThomas Graf * @flags: message flags 570bfa83a9eSThomas Graf * 571bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 572bfa83a9eSThomas Graf * the message header and payload. 573bfa83a9eSThomas Graf */ 57415e47304SEric W. Biederman static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, 575bfa83a9eSThomas Graf int type, int payload, int flags) 576bfa83a9eSThomas Graf { 577bfa83a9eSThomas Graf if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) 578bfa83a9eSThomas Graf return NULL; 579bfa83a9eSThomas Graf 58015e47304SEric W. Biederman return __nlmsg_put(skb, portid, seq, type, payload, flags); 581bfa83a9eSThomas Graf } 582bfa83a9eSThomas Graf 583bfa83a9eSThomas Graf /** 584bfa83a9eSThomas Graf * nlmsg_put_answer - Add a new callback based netlink message to an skb 585bfa83a9eSThomas Graf * @skb: socket buffer to store message in 586bfa83a9eSThomas Graf * @cb: netlink callback 587bfa83a9eSThomas Graf * @type: message type 588bfa83a9eSThomas Graf * @payload: length of message payload 589bfa83a9eSThomas Graf * @flags: message flags 590bfa83a9eSThomas Graf * 591bfa83a9eSThomas Graf * Returns NULL if the tailroom of the skb is insufficient to store 592bfa83a9eSThomas Graf * the message header and payload. 593bfa83a9eSThomas Graf */ 594bfa83a9eSThomas Graf static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, 595bfa83a9eSThomas Graf struct netlink_callback *cb, 596bfa83a9eSThomas Graf int type, int payload, 597bfa83a9eSThomas Graf int flags) 598bfa83a9eSThomas Graf { 59915e47304SEric W. Biederman return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 600bfa83a9eSThomas Graf type, payload, flags); 601bfa83a9eSThomas Graf } 602bfa83a9eSThomas Graf 603bfa83a9eSThomas Graf /** 604bfa83a9eSThomas Graf * nlmsg_new - Allocate a new netlink message 605339bf98fSThomas Graf * @payload: size of the message payload 606fe4944e5SThomas Graf * @flags: the type of memory to allocate. 607bfa83a9eSThomas Graf * 608339bf98fSThomas Graf * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known 609339bf98fSThomas Graf * and a good default is needed. 610bfa83a9eSThomas Graf */ 611339bf98fSThomas Graf static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) 612bfa83a9eSThomas Graf { 613339bf98fSThomas Graf return alloc_skb(nlmsg_total_size(payload), flags); 614bfa83a9eSThomas Graf } 615bfa83a9eSThomas Graf 616bfa83a9eSThomas Graf /** 617bfa83a9eSThomas Graf * nlmsg_end - Finalize a netlink message 618bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 619bfa83a9eSThomas Graf * @nlh: netlink message header 620bfa83a9eSThomas Graf * 621bfa83a9eSThomas Graf * Corrects the netlink message header to include the appeneded 622bfa83a9eSThomas Graf * attributes. Only necessary if attributes have been added to 623bfa83a9eSThomas Graf * the message. 624bfa83a9eSThomas Graf */ 625053c095aSJohannes Berg static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) 626bfa83a9eSThomas Graf { 62727a884dcSArnaldo Carvalho de Melo nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; 628bfa83a9eSThomas Graf } 629bfa83a9eSThomas Graf 630bfa83a9eSThomas Graf /** 631fe4944e5SThomas Graf * nlmsg_get_pos - return current position in netlink message 632fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 633fe4944e5SThomas Graf * 634fe4944e5SThomas Graf * Returns a pointer to the current tail of the message. 635fe4944e5SThomas Graf */ 636fe4944e5SThomas Graf static inline void *nlmsg_get_pos(struct sk_buff *skb) 637fe4944e5SThomas Graf { 63827a884dcSArnaldo Carvalho de Melo return skb_tail_pointer(skb); 639fe4944e5SThomas Graf } 640fe4944e5SThomas Graf 641fe4944e5SThomas Graf /** 642fe4944e5SThomas Graf * nlmsg_trim - Trim message to a mark 643fe4944e5SThomas Graf * @skb: socket buffer the message is stored in 644fe4944e5SThomas Graf * @mark: mark to trim to 645fe4944e5SThomas Graf * 646bc3ed28cSThomas Graf * Trims the message to the provided mark. 647fe4944e5SThomas Graf */ 648bc3ed28cSThomas Graf static inline void nlmsg_trim(struct sk_buff *skb, const void *mark) 649fe4944e5SThomas Graf { 650149118d8SThomas Graf if (mark) { 651149118d8SThomas Graf WARN_ON((unsigned char *) mark < skb->data); 652fe4944e5SThomas Graf skb_trim(skb, (unsigned char *) mark - skb->data); 653fe4944e5SThomas Graf } 654149118d8SThomas Graf } 655fe4944e5SThomas Graf 656fe4944e5SThomas Graf /** 657bfa83a9eSThomas Graf * nlmsg_cancel - Cancel construction of a netlink message 658bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 659bfa83a9eSThomas Graf * @nlh: netlink message header 660bfa83a9eSThomas Graf * 661bfa83a9eSThomas Graf * Removes the complete netlink message including all 662bc3ed28cSThomas Graf * attributes from the socket buffer again. 663bfa83a9eSThomas Graf */ 664bc3ed28cSThomas Graf static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) 665bfa83a9eSThomas Graf { 666bc3ed28cSThomas Graf nlmsg_trim(skb, nlh); 667bfa83a9eSThomas Graf } 668bfa83a9eSThomas Graf 669bfa83a9eSThomas Graf /** 670bfa83a9eSThomas Graf * nlmsg_free - free a netlink message 671bfa83a9eSThomas Graf * @skb: socket buffer of netlink message 672bfa83a9eSThomas Graf */ 673bfa83a9eSThomas Graf static inline void nlmsg_free(struct sk_buff *skb) 674bfa83a9eSThomas Graf { 675bfa83a9eSThomas Graf kfree_skb(skb); 676bfa83a9eSThomas Graf } 677bfa83a9eSThomas Graf 678bfa83a9eSThomas Graf /** 679bfa83a9eSThomas Graf * nlmsg_multicast - multicast a netlink message 680bfa83a9eSThomas Graf * @sk: netlink socket to spread messages to 681bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 68215e47304SEric W. Biederman * @portid: own netlink portid to avoid sending to yourself 683bfa83a9eSThomas Graf * @group: multicast group id 684d387f6adSThomas Graf * @flags: allocation flags 685bfa83a9eSThomas Graf */ 686bfa83a9eSThomas Graf static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, 68715e47304SEric W. Biederman u32 portid, unsigned int group, gfp_t flags) 688bfa83a9eSThomas Graf { 689bfa83a9eSThomas Graf int err; 690bfa83a9eSThomas Graf 691bfa83a9eSThomas Graf NETLINK_CB(skb).dst_group = group; 692bfa83a9eSThomas Graf 69315e47304SEric W. Biederman err = netlink_broadcast(sk, skb, portid, group, flags); 694bfa83a9eSThomas Graf if (err > 0) 695bfa83a9eSThomas Graf err = 0; 696bfa83a9eSThomas Graf 697bfa83a9eSThomas Graf return err; 698bfa83a9eSThomas Graf } 699bfa83a9eSThomas Graf 700bfa83a9eSThomas Graf /** 701bfa83a9eSThomas Graf * nlmsg_unicast - unicast a netlink message 702bfa83a9eSThomas Graf * @sk: netlink socket to spread message to 703bfa83a9eSThomas Graf * @skb: netlink message as socket buffer 70415e47304SEric W. Biederman * @portid: netlink portid of the destination socket 705bfa83a9eSThomas Graf */ 70615e47304SEric W. Biederman static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid) 707bfa83a9eSThomas Graf { 708bfa83a9eSThomas Graf int err; 709bfa83a9eSThomas Graf 71015e47304SEric W. Biederman err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT); 711bfa83a9eSThomas Graf if (err > 0) 712bfa83a9eSThomas Graf err = 0; 713bfa83a9eSThomas Graf 714bfa83a9eSThomas Graf return err; 715bfa83a9eSThomas Graf } 716bfa83a9eSThomas Graf 717bfa83a9eSThomas Graf /** 718bfa83a9eSThomas Graf * nlmsg_for_each_msg - iterate over a stream of messages 719bfa83a9eSThomas Graf * @pos: loop counter, set to current message 720bfa83a9eSThomas Graf * @head: head of message stream 721bfa83a9eSThomas Graf * @len: length of message stream 722bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 723bfa83a9eSThomas Graf */ 724bfa83a9eSThomas Graf #define nlmsg_for_each_msg(pos, head, len, rem) \ 725bfa83a9eSThomas Graf for (pos = head, rem = len; \ 726bfa83a9eSThomas Graf nlmsg_ok(pos, rem); \ 727bfa83a9eSThomas Graf pos = nlmsg_next(pos, &(rem))) 728bfa83a9eSThomas Graf 729670dc283SJohannes Berg /** 730670dc283SJohannes Berg * nl_dump_check_consistent - check if sequence is consistent and advertise if not 731670dc283SJohannes Berg * @cb: netlink callback structure that stores the sequence number 732670dc283SJohannes Berg * @nlh: netlink message header to write the flag to 733670dc283SJohannes Berg * 734670dc283SJohannes Berg * This function checks if the sequence (generation) number changed during dump 735670dc283SJohannes Berg * and if it did, advertises it in the netlink message header. 736670dc283SJohannes Berg * 737670dc283SJohannes Berg * The correct way to use it is to set cb->seq to the generation counter when 738670dc283SJohannes Berg * all locks for dumping have been acquired, and then call this function for 739670dc283SJohannes Berg * each message that is generated. 740670dc283SJohannes Berg * 741670dc283SJohannes Berg * Note that due to initialisation concerns, 0 is an invalid sequence number 742670dc283SJohannes Berg * and must not be used by code that uses this functionality. 743670dc283SJohannes Berg */ 744670dc283SJohannes Berg static inline void 745670dc283SJohannes Berg nl_dump_check_consistent(struct netlink_callback *cb, 746670dc283SJohannes Berg struct nlmsghdr *nlh) 747670dc283SJohannes Berg { 748670dc283SJohannes Berg if (cb->prev_seq && cb->seq != cb->prev_seq) 749670dc283SJohannes Berg nlh->nlmsg_flags |= NLM_F_DUMP_INTR; 750670dc283SJohannes Berg cb->prev_seq = cb->seq; 751670dc283SJohannes Berg } 752670dc283SJohannes Berg 753bfa83a9eSThomas Graf /************************************************************************** 754bfa83a9eSThomas Graf * Netlink Attributes 755bfa83a9eSThomas Graf **************************************************************************/ 756bfa83a9eSThomas Graf 757bfa83a9eSThomas Graf /** 758bfa83a9eSThomas Graf * nla_attr_size - length of attribute not including padding 759bfa83a9eSThomas Graf * @payload: length of payload 760bfa83a9eSThomas Graf */ 761bfa83a9eSThomas Graf static inline int nla_attr_size(int payload) 762bfa83a9eSThomas Graf { 763bfa83a9eSThomas Graf return NLA_HDRLEN + payload; 764bfa83a9eSThomas Graf } 765bfa83a9eSThomas Graf 766bfa83a9eSThomas Graf /** 767bfa83a9eSThomas Graf * nla_total_size - total length of attribute including padding 768bfa83a9eSThomas Graf * @payload: length of payload 769bfa83a9eSThomas Graf */ 770bfa83a9eSThomas Graf static inline int nla_total_size(int payload) 771bfa83a9eSThomas Graf { 772bfa83a9eSThomas Graf return NLA_ALIGN(nla_attr_size(payload)); 773bfa83a9eSThomas Graf } 774bfa83a9eSThomas Graf 775bfa83a9eSThomas Graf /** 776bfa83a9eSThomas Graf * nla_padlen - length of padding at the tail of attribute 777bfa83a9eSThomas Graf * @payload: length of payload 778bfa83a9eSThomas Graf */ 779bfa83a9eSThomas Graf static inline int nla_padlen(int payload) 780bfa83a9eSThomas Graf { 781bfa83a9eSThomas Graf return nla_total_size(payload) - nla_attr_size(payload); 782bfa83a9eSThomas Graf } 783bfa83a9eSThomas Graf 784bfa83a9eSThomas Graf /** 7858f4c1f9bSThomas Graf * nla_type - attribute type 7868f4c1f9bSThomas Graf * @nla: netlink attribute 7878f4c1f9bSThomas Graf */ 7888f4c1f9bSThomas Graf static inline int nla_type(const struct nlattr *nla) 7898f4c1f9bSThomas Graf { 7908f4c1f9bSThomas Graf return nla->nla_type & NLA_TYPE_MASK; 7918f4c1f9bSThomas Graf } 7928f4c1f9bSThomas Graf 7938f4c1f9bSThomas Graf /** 794bfa83a9eSThomas Graf * nla_data - head of payload 795bfa83a9eSThomas Graf * @nla: netlink attribute 796bfa83a9eSThomas Graf */ 797bfa83a9eSThomas Graf static inline void *nla_data(const struct nlattr *nla) 798bfa83a9eSThomas Graf { 799bfa83a9eSThomas Graf return (char *) nla + NLA_HDRLEN; 800bfa83a9eSThomas Graf } 801bfa83a9eSThomas Graf 802bfa83a9eSThomas Graf /** 803bfa83a9eSThomas Graf * nla_len - length of payload 804bfa83a9eSThomas Graf * @nla: netlink attribute 805bfa83a9eSThomas Graf */ 806bfa83a9eSThomas Graf static inline int nla_len(const struct nlattr *nla) 807bfa83a9eSThomas Graf { 808bfa83a9eSThomas Graf return nla->nla_len - NLA_HDRLEN; 809bfa83a9eSThomas Graf } 810bfa83a9eSThomas Graf 811bfa83a9eSThomas Graf /** 812bfa83a9eSThomas Graf * nla_ok - check if the netlink attribute fits into the remaining bytes 813bfa83a9eSThomas Graf * @nla: netlink attribute 814bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 815bfa83a9eSThomas Graf */ 816bfa83a9eSThomas Graf static inline int nla_ok(const struct nlattr *nla, int remaining) 817bfa83a9eSThomas Graf { 8183e1ed981SAlexey Dobriyan return remaining >= (int) sizeof(*nla) && 8193e1ed981SAlexey Dobriyan nla->nla_len >= sizeof(*nla) && 820bfa83a9eSThomas Graf nla->nla_len <= remaining; 821bfa83a9eSThomas Graf } 822bfa83a9eSThomas Graf 823bfa83a9eSThomas Graf /** 824d1ec3b77SPierre Ynard * nla_next - next netlink attribute in attribute stream 825bfa83a9eSThomas Graf * @nla: netlink attribute 826bfa83a9eSThomas Graf * @remaining: number of bytes remaining in attribute stream 827bfa83a9eSThomas Graf * 828bfa83a9eSThomas Graf * Returns the next netlink attribute in the attribute stream and 829bfa83a9eSThomas Graf * decrements remaining by the size of the current attribute. 830bfa83a9eSThomas Graf */ 831bfa83a9eSThomas Graf static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) 832bfa83a9eSThomas Graf { 8333b2c75d3SAlexey Dobriyan unsigned int totlen = NLA_ALIGN(nla->nla_len); 834bfa83a9eSThomas Graf 835bfa83a9eSThomas Graf *remaining -= totlen; 836bfa83a9eSThomas Graf return (struct nlattr *) ((char *) nla + totlen); 837bfa83a9eSThomas Graf } 838bfa83a9eSThomas Graf 839bfa83a9eSThomas Graf /** 840fe4944e5SThomas Graf * nla_find_nested - find attribute in a set of nested attributes 841fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 842fe4944e5SThomas Graf * @attrtype: type of attribute to look for 843fe4944e5SThomas Graf * 844fe4944e5SThomas Graf * Returns the first attribute which matches the specified type. 845fe4944e5SThomas Graf */ 8463654654fSJan Engelhardt static inline struct nlattr * 8473654654fSJan Engelhardt nla_find_nested(const struct nlattr *nla, int attrtype) 848fe4944e5SThomas Graf { 849fe4944e5SThomas Graf return nla_find(nla_data(nla), nla_len(nla), attrtype); 850fe4944e5SThomas Graf } 851fe4944e5SThomas Graf 852fe4944e5SThomas Graf /** 853bfa83a9eSThomas Graf * nla_parse_nested - parse nested attributes 854bfa83a9eSThomas Graf * @tb: destination array with maxtype+1 elements 855bfa83a9eSThomas Graf * @maxtype: maximum attribute type to be expected 856bfa83a9eSThomas Graf * @nla: attribute containing the nested attributes 857bfa83a9eSThomas Graf * @policy: validation policy 858fceb6435SJohannes Berg * @extack: extended ACK report struct 859bfa83a9eSThomas Graf * 860bfa83a9eSThomas Graf * See nla_parse() 861bfa83a9eSThomas Graf */ 862bfa83a9eSThomas Graf static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, 863b057efd4SPatrick McHardy const struct nlattr *nla, 864fceb6435SJohannes Berg const struct nla_policy *policy, 865fceb6435SJohannes Berg struct netlink_ext_ack *extack) 866bfa83a9eSThomas Graf { 867fceb6435SJohannes Berg return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy, 868fceb6435SJohannes Berg extack); 869bfa83a9eSThomas Graf } 8701092cb21SPatrick McHardy 8711092cb21SPatrick McHardy /** 872d1ec3b77SPierre Ynard * nla_put_u8 - Add a u8 netlink attribute to a socket buffer 873bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 874bfa83a9eSThomas Graf * @attrtype: attribute type 875bfa83a9eSThomas Graf * @value: numeric value 876bfa83a9eSThomas Graf */ 877bfa83a9eSThomas Graf static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) 878bfa83a9eSThomas Graf { 879b4391db4SArnd Bergmann /* temporary variables to work around GCC PR81715 with asan-stack=1 */ 880b4391db4SArnd Bergmann u8 tmp = value; 881b4391db4SArnd Bergmann 882b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(u8), &tmp); 883bfa83a9eSThomas Graf } 884bfa83a9eSThomas Graf 885bfa83a9eSThomas Graf /** 886bfa83a9eSThomas Graf * nla_put_u16 - Add a u16 netlink attribute to a socket buffer 887bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 888bfa83a9eSThomas Graf * @attrtype: attribute type 889bfa83a9eSThomas Graf * @value: numeric value 890bfa83a9eSThomas Graf */ 891bfa83a9eSThomas Graf static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) 892bfa83a9eSThomas Graf { 893b4391db4SArnd Bergmann u16 tmp = value; 894b4391db4SArnd Bergmann 895b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(u16), &tmp); 896bfa83a9eSThomas Graf } 897bfa83a9eSThomas Graf 898bfa83a9eSThomas Graf /** 899569a8fc3SDavid S. Miller * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer 900569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 901569a8fc3SDavid S. Miller * @attrtype: attribute type 902569a8fc3SDavid S. Miller * @value: numeric value 903569a8fc3SDavid S. Miller */ 904569a8fc3SDavid S. Miller static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value) 905569a8fc3SDavid S. Miller { 906b4391db4SArnd Bergmann __be16 tmp = value; 907b4391db4SArnd Bergmann 908b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__be16), &tmp); 909569a8fc3SDavid S. Miller } 910569a8fc3SDavid S. Miller 911569a8fc3SDavid S. Miller /** 9126c1dd3b6SDavid S. Miller * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer 9136c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 9146c1dd3b6SDavid S. Miller * @attrtype: attribute type 9156c1dd3b6SDavid S. Miller * @value: numeric value 9166c1dd3b6SDavid S. Miller */ 9176c1dd3b6SDavid S. Miller static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value) 9186c1dd3b6SDavid S. Miller { 919b4391db4SArnd Bergmann __be16 tmp = value; 920b4391db4SArnd Bergmann 921b4391db4SArnd Bergmann return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, tmp); 9226c1dd3b6SDavid S. Miller } 9236c1dd3b6SDavid S. Miller 9246c1dd3b6SDavid S. Miller /** 92524c410dcSDavid S. Miller * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer 92624c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 92724c410dcSDavid S. Miller * @attrtype: attribute type 92824c410dcSDavid S. Miller * @value: numeric value 92924c410dcSDavid S. Miller */ 93024c410dcSDavid S. Miller static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value) 93124c410dcSDavid S. Miller { 932b4391db4SArnd Bergmann __le16 tmp = value; 933b4391db4SArnd Bergmann 934b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__le16), &tmp); 93524c410dcSDavid S. Miller } 93624c410dcSDavid S. Miller 93724c410dcSDavid S. Miller /** 938bfa83a9eSThomas Graf * nla_put_u32 - Add a u32 netlink attribute to a socket buffer 939bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 940bfa83a9eSThomas Graf * @attrtype: attribute type 941bfa83a9eSThomas Graf * @value: numeric value 942bfa83a9eSThomas Graf */ 943bfa83a9eSThomas Graf static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) 944bfa83a9eSThomas Graf { 945b4391db4SArnd Bergmann u32 tmp = value; 946b4391db4SArnd Bergmann 947b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(u32), &tmp); 948bfa83a9eSThomas Graf } 949bfa83a9eSThomas Graf 950bfa83a9eSThomas Graf /** 951569a8fc3SDavid S. Miller * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer 952569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 953569a8fc3SDavid S. Miller * @attrtype: attribute type 954569a8fc3SDavid S. Miller * @value: numeric value 955569a8fc3SDavid S. Miller */ 956569a8fc3SDavid S. Miller static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value) 957569a8fc3SDavid S. Miller { 958b4391db4SArnd Bergmann __be32 tmp = value; 959b4391db4SArnd Bergmann 960b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__be32), &tmp); 961569a8fc3SDavid S. Miller } 962569a8fc3SDavid S. Miller 963569a8fc3SDavid S. Miller /** 9646c1dd3b6SDavid S. Miller * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer 9656c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 9666c1dd3b6SDavid S. Miller * @attrtype: attribute type 9676c1dd3b6SDavid S. Miller * @value: numeric value 9686c1dd3b6SDavid S. Miller */ 9696c1dd3b6SDavid S. Miller static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value) 9706c1dd3b6SDavid S. Miller { 971b4391db4SArnd Bergmann __be32 tmp = value; 972b4391db4SArnd Bergmann 973b4391db4SArnd Bergmann return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, tmp); 9746c1dd3b6SDavid S. Miller } 9756c1dd3b6SDavid S. Miller 9766c1dd3b6SDavid S. Miller /** 97724c410dcSDavid S. Miller * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer 97824c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 97924c410dcSDavid S. Miller * @attrtype: attribute type 98024c410dcSDavid S. Miller * @value: numeric value 98124c410dcSDavid S. Miller */ 98224c410dcSDavid S. Miller static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value) 98324c410dcSDavid S. Miller { 984b4391db4SArnd Bergmann __le32 tmp = value; 985b4391db4SArnd Bergmann 986b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(__le32), &tmp); 98724c410dcSDavid S. Miller } 98824c410dcSDavid S. Miller 98924c410dcSDavid S. Miller /** 99073520786SNicolas Dichtel * nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it 99173520786SNicolas Dichtel * @skb: socket buffer to add attribute to 99273520786SNicolas Dichtel * @attrtype: attribute type 99373520786SNicolas Dichtel * @value: numeric value 99473520786SNicolas Dichtel * @padattr: attribute type for the padding 99573520786SNicolas Dichtel */ 99673520786SNicolas Dichtel static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype, 99773520786SNicolas Dichtel u64 value, int padattr) 99873520786SNicolas Dichtel { 999b4391db4SArnd Bergmann u64 tmp = value; 1000b4391db4SArnd Bergmann 1001b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); 100273520786SNicolas Dichtel } 100373520786SNicolas Dichtel 100473520786SNicolas Dichtel /** 1005b46f6dedSNicolas Dichtel * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it 1006569a8fc3SDavid S. Miller * @skb: socket buffer to add attribute to 1007569a8fc3SDavid S. Miller * @attrtype: attribute type 1008569a8fc3SDavid S. Miller * @value: numeric value 1009b46f6dedSNicolas Dichtel * @padattr: attribute type for the padding 1010569a8fc3SDavid S. Miller */ 1011b46f6dedSNicolas Dichtel static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value, 1012b46f6dedSNicolas Dichtel int padattr) 1013b46f6dedSNicolas Dichtel { 1014b4391db4SArnd Bergmann __be64 tmp = value; 1015b4391db4SArnd Bergmann 1016b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(__be64), &tmp, padattr); 1017b46f6dedSNicolas Dichtel } 1018b46f6dedSNicolas Dichtel 1019569a8fc3SDavid S. Miller /** 1020e9bbe898SNicolas Dichtel * nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it 10216c1dd3b6SDavid S. Miller * @skb: socket buffer to add attribute to 10226c1dd3b6SDavid S. Miller * @attrtype: attribute type 10236c1dd3b6SDavid S. Miller * @value: numeric value 1024e9bbe898SNicolas Dichtel * @padattr: attribute type for the padding 10256c1dd3b6SDavid S. Miller */ 1026e9bbe898SNicolas Dichtel static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value, 1027e9bbe898SNicolas Dichtel int padattr) 10286c1dd3b6SDavid S. Miller { 1029b4391db4SArnd Bergmann __be64 tmp = value; 1030b4391db4SArnd Bergmann 1031b4391db4SArnd Bergmann return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, tmp, 1032e9bbe898SNicolas Dichtel padattr); 10336c1dd3b6SDavid S. Miller } 10346c1dd3b6SDavid S. Miller 10356c1dd3b6SDavid S. Miller /** 1036e7479122SNicolas Dichtel * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it 103724c410dcSDavid S. Miller * @skb: socket buffer to add attribute to 103824c410dcSDavid S. Miller * @attrtype: attribute type 103924c410dcSDavid S. Miller * @value: numeric value 1040e7479122SNicolas Dichtel * @padattr: attribute type for the padding 104124c410dcSDavid S. Miller */ 1042e7479122SNicolas Dichtel static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value, 1043e7479122SNicolas Dichtel int padattr) 104424c410dcSDavid S. Miller { 1045b4391db4SArnd Bergmann __le64 tmp = value; 1046b4391db4SArnd Bergmann 1047b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(__le64), &tmp, padattr); 104824c410dcSDavid S. Miller } 104924c410dcSDavid S. Miller 105024c410dcSDavid S. Miller /** 10514778e0beSJiri Pirko * nla_put_s8 - Add a s8 netlink attribute to a socket buffer 10524778e0beSJiri Pirko * @skb: socket buffer to add attribute to 10534778e0beSJiri Pirko * @attrtype: attribute type 10544778e0beSJiri Pirko * @value: numeric value 10554778e0beSJiri Pirko */ 10564778e0beSJiri Pirko static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value) 10574778e0beSJiri Pirko { 1058b4391db4SArnd Bergmann s8 tmp = value; 1059b4391db4SArnd Bergmann 1060b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(s8), &tmp); 10614778e0beSJiri Pirko } 10624778e0beSJiri Pirko 10634778e0beSJiri Pirko /** 10644778e0beSJiri Pirko * nla_put_s16 - Add a s16 netlink attribute to a socket buffer 10654778e0beSJiri Pirko * @skb: socket buffer to add attribute to 10664778e0beSJiri Pirko * @attrtype: attribute type 10674778e0beSJiri Pirko * @value: numeric value 10684778e0beSJiri Pirko */ 10694778e0beSJiri Pirko static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value) 10704778e0beSJiri Pirko { 1071b4391db4SArnd Bergmann s16 tmp = value; 1072b4391db4SArnd Bergmann 1073b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(s16), &tmp); 10744778e0beSJiri Pirko } 10754778e0beSJiri Pirko 10764778e0beSJiri Pirko /** 10774778e0beSJiri Pirko * nla_put_s32 - Add a s32 netlink attribute to a socket buffer 10784778e0beSJiri Pirko * @skb: socket buffer to add attribute to 10794778e0beSJiri Pirko * @attrtype: attribute type 10804778e0beSJiri Pirko * @value: numeric value 10814778e0beSJiri Pirko */ 10824778e0beSJiri Pirko static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value) 10834778e0beSJiri Pirko { 1084b4391db4SArnd Bergmann s32 tmp = value; 1085b4391db4SArnd Bergmann 1086b4391db4SArnd Bergmann return nla_put(skb, attrtype, sizeof(s32), &tmp); 10874778e0beSJiri Pirko } 10884778e0beSJiri Pirko 10894778e0beSJiri Pirko /** 1090756a2f59SNicolas Dichtel * nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it 10914778e0beSJiri Pirko * @skb: socket buffer to add attribute to 10924778e0beSJiri Pirko * @attrtype: attribute type 10934778e0beSJiri Pirko * @value: numeric value 1094756a2f59SNicolas Dichtel * @padattr: attribute type for the padding 10954778e0beSJiri Pirko */ 1096756a2f59SNicolas Dichtel static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value, 1097756a2f59SNicolas Dichtel int padattr) 10984778e0beSJiri Pirko { 1099b4391db4SArnd Bergmann s64 tmp = value; 1100b4391db4SArnd Bergmann 1101b4391db4SArnd Bergmann return nla_put_64bit(skb, attrtype, sizeof(s64), &tmp, padattr); 11024778e0beSJiri Pirko } 11034778e0beSJiri Pirko 11044778e0beSJiri Pirko /** 1105bfa83a9eSThomas Graf * nla_put_string - Add a string netlink attribute to a socket buffer 1106bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1107bfa83a9eSThomas Graf * @attrtype: attribute type 1108bfa83a9eSThomas Graf * @str: NUL terminated string 1109bfa83a9eSThomas Graf */ 1110bfa83a9eSThomas Graf static inline int nla_put_string(struct sk_buff *skb, int attrtype, 1111bfa83a9eSThomas Graf const char *str) 1112bfa83a9eSThomas Graf { 1113bfa83a9eSThomas Graf return nla_put(skb, attrtype, strlen(str) + 1, str); 1114bfa83a9eSThomas Graf } 1115bfa83a9eSThomas Graf 1116bfa83a9eSThomas Graf /** 1117bfa83a9eSThomas Graf * nla_put_flag - Add a flag netlink attribute to a socket buffer 1118bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1119bfa83a9eSThomas Graf * @attrtype: attribute type 1120bfa83a9eSThomas Graf */ 1121bfa83a9eSThomas Graf static inline int nla_put_flag(struct sk_buff *skb, int attrtype) 1122bfa83a9eSThomas Graf { 1123bfa83a9eSThomas Graf return nla_put(skb, attrtype, 0, NULL); 1124bfa83a9eSThomas Graf } 1125bfa83a9eSThomas Graf 1126bfa83a9eSThomas Graf /** 11272175d87cSNicolas Dichtel * nla_put_msecs - Add a msecs netlink attribute to a skb and align it 1128bfa83a9eSThomas Graf * @skb: socket buffer to add attribute to 1129bfa83a9eSThomas Graf * @attrtype: attribute type 1130d87de1f3SMark Rustad * @njiffies: number of jiffies to convert to msecs 11312175d87cSNicolas Dichtel * @padattr: attribute type for the padding 1132bfa83a9eSThomas Graf */ 1133bfa83a9eSThomas Graf static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, 11342175d87cSNicolas Dichtel unsigned long njiffies, int padattr) 1135bfa83a9eSThomas Graf { 1136d87de1f3SMark Rustad u64 tmp = jiffies_to_msecs(njiffies); 11372175d87cSNicolas Dichtel 11382175d87cSNicolas Dichtel return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); 1139bfa83a9eSThomas Graf } 1140bfa83a9eSThomas Graf 1141bfa83a9eSThomas Graf /** 1142930345eaSJiri Benc * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket 1143930345eaSJiri Benc * buffer 1144930345eaSJiri Benc * @skb: socket buffer to add attribute to 1145930345eaSJiri Benc * @attrtype: attribute type 1146930345eaSJiri Benc * @addr: IPv4 address 1147930345eaSJiri Benc */ 1148930345eaSJiri Benc static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype, 1149930345eaSJiri Benc __be32 addr) 1150930345eaSJiri Benc { 1151b4391db4SArnd Bergmann __be32 tmp = addr; 1152b4391db4SArnd Bergmann 1153b4391db4SArnd Bergmann return nla_put_be32(skb, attrtype, tmp); 1154930345eaSJiri Benc } 1155930345eaSJiri Benc 1156930345eaSJiri Benc /** 1157930345eaSJiri Benc * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket 1158930345eaSJiri Benc * buffer 1159930345eaSJiri Benc * @skb: socket buffer to add attribute to 1160930345eaSJiri Benc * @attrtype: attribute type 1161930345eaSJiri Benc * @addr: IPv6 address 1162930345eaSJiri Benc */ 1163930345eaSJiri Benc static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype, 1164930345eaSJiri Benc const struct in6_addr *addr) 1165930345eaSJiri Benc { 1166930345eaSJiri Benc return nla_put(skb, attrtype, sizeof(*addr), addr); 1167930345eaSJiri Benc } 1168930345eaSJiri Benc 1169930345eaSJiri Benc /** 1170bfa83a9eSThomas Graf * nla_get_u32 - return payload of u32 attribute 1171bfa83a9eSThomas Graf * @nla: u32 netlink attribute 1172bfa83a9eSThomas Graf */ 1173b057efd4SPatrick McHardy static inline u32 nla_get_u32(const struct nlattr *nla) 1174bfa83a9eSThomas Graf { 1175bfa83a9eSThomas Graf return *(u32 *) nla_data(nla); 1176bfa83a9eSThomas Graf } 1177bfa83a9eSThomas Graf 1178bfa83a9eSThomas Graf /** 117900012e5bSAl Viro * nla_get_be32 - return payload of __be32 attribute 118000012e5bSAl Viro * @nla: __be32 netlink attribute 118100012e5bSAl Viro */ 1182b057efd4SPatrick McHardy static inline __be32 nla_get_be32(const struct nlattr *nla) 118300012e5bSAl Viro { 118400012e5bSAl Viro return *(__be32 *) nla_data(nla); 118500012e5bSAl Viro } 118600012e5bSAl Viro 118700012e5bSAl Viro /** 1188c648a013SAlexander Aring * nla_get_le32 - return payload of __le32 attribute 1189c648a013SAlexander Aring * @nla: __le32 netlink attribute 1190c648a013SAlexander Aring */ 1191c648a013SAlexander Aring static inline __le32 nla_get_le32(const struct nlattr *nla) 1192c648a013SAlexander Aring { 1193c648a013SAlexander Aring return *(__le32 *) nla_data(nla); 1194c648a013SAlexander Aring } 1195c648a013SAlexander Aring 1196c648a013SAlexander Aring /** 1197bfa83a9eSThomas Graf * nla_get_u16 - return payload of u16 attribute 1198bfa83a9eSThomas Graf * @nla: u16 netlink attribute 1199bfa83a9eSThomas Graf */ 1200b057efd4SPatrick McHardy static inline u16 nla_get_u16(const struct nlattr *nla) 1201bfa83a9eSThomas Graf { 1202bfa83a9eSThomas Graf return *(u16 *) nla_data(nla); 1203bfa83a9eSThomas Graf } 1204bfa83a9eSThomas Graf 1205bfa83a9eSThomas Graf /** 1206838965baSPatrick McHardy * nla_get_be16 - return payload of __be16 attribute 1207838965baSPatrick McHardy * @nla: __be16 netlink attribute 1208838965baSPatrick McHardy */ 1209b057efd4SPatrick McHardy static inline __be16 nla_get_be16(const struct nlattr *nla) 1210838965baSPatrick McHardy { 1211838965baSPatrick McHardy return *(__be16 *) nla_data(nla); 1212838965baSPatrick McHardy } 1213838965baSPatrick McHardy 1214838965baSPatrick McHardy /** 12154a89c256SThomas Graf * nla_get_le16 - return payload of __le16 attribute 12164a89c256SThomas Graf * @nla: __le16 netlink attribute 12174a89c256SThomas Graf */ 1218b057efd4SPatrick McHardy static inline __le16 nla_get_le16(const struct nlattr *nla) 12194a89c256SThomas Graf { 12204a89c256SThomas Graf return *(__le16 *) nla_data(nla); 12214a89c256SThomas Graf } 12224a89c256SThomas Graf 12234a89c256SThomas Graf /** 1224bfa83a9eSThomas Graf * nla_get_u8 - return payload of u8 attribute 1225bfa83a9eSThomas Graf * @nla: u8 netlink attribute 1226bfa83a9eSThomas Graf */ 1227b057efd4SPatrick McHardy static inline u8 nla_get_u8(const struct nlattr *nla) 1228bfa83a9eSThomas Graf { 1229bfa83a9eSThomas Graf return *(u8 *) nla_data(nla); 1230bfa83a9eSThomas Graf } 1231bfa83a9eSThomas Graf 1232bfa83a9eSThomas Graf /** 1233bfa83a9eSThomas Graf * nla_get_u64 - return payload of u64 attribute 1234bfa83a9eSThomas Graf * @nla: u64 netlink attribute 1235bfa83a9eSThomas Graf */ 1236b057efd4SPatrick McHardy static inline u64 nla_get_u64(const struct nlattr *nla) 1237bfa83a9eSThomas Graf { 1238bfa83a9eSThomas Graf u64 tmp; 1239bfa83a9eSThomas Graf 1240bfa83a9eSThomas Graf nla_memcpy(&tmp, nla, sizeof(tmp)); 1241bfa83a9eSThomas Graf 1242bfa83a9eSThomas Graf return tmp; 1243bfa83a9eSThomas Graf } 1244bfa83a9eSThomas Graf 1245bfa83a9eSThomas Graf /** 1246a17c8598SPablo Neira Ayuso * nla_get_be64 - return payload of __be64 attribute 1247a17c8598SPablo Neira Ayuso * @nla: __be64 netlink attribute 1248a17c8598SPablo Neira Ayuso */ 1249a17c8598SPablo Neira Ayuso static inline __be64 nla_get_be64(const struct nlattr *nla) 1250a17c8598SPablo Neira Ayuso { 1251f5d410f2SPablo Neira Ayuso __be64 tmp; 1252f5d410f2SPablo Neira Ayuso 1253f5d410f2SPablo Neira Ayuso nla_memcpy(&tmp, nla, sizeof(tmp)); 1254f5d410f2SPablo Neira Ayuso 1255f5d410f2SPablo Neira Ayuso return tmp; 1256a17c8598SPablo Neira Ayuso } 1257a17c8598SPablo Neira Ayuso 1258a17c8598SPablo Neira Ayuso /** 1259c648a013SAlexander Aring * nla_get_le64 - return payload of __le64 attribute 1260c648a013SAlexander Aring * @nla: __le64 netlink attribute 1261c648a013SAlexander Aring */ 1262c648a013SAlexander Aring static inline __le64 nla_get_le64(const struct nlattr *nla) 1263c648a013SAlexander Aring { 1264c648a013SAlexander Aring return *(__le64 *) nla_data(nla); 1265c648a013SAlexander Aring } 1266c648a013SAlexander Aring 1267c648a013SAlexander Aring /** 12684778e0beSJiri Pirko * nla_get_s32 - return payload of s32 attribute 12694778e0beSJiri Pirko * @nla: s32 netlink attribute 12704778e0beSJiri Pirko */ 12714778e0beSJiri Pirko static inline s32 nla_get_s32(const struct nlattr *nla) 12724778e0beSJiri Pirko { 12734778e0beSJiri Pirko return *(s32 *) nla_data(nla); 12744778e0beSJiri Pirko } 12754778e0beSJiri Pirko 12764778e0beSJiri Pirko /** 12774778e0beSJiri Pirko * nla_get_s16 - return payload of s16 attribute 12784778e0beSJiri Pirko * @nla: s16 netlink attribute 12794778e0beSJiri Pirko */ 12804778e0beSJiri Pirko static inline s16 nla_get_s16(const struct nlattr *nla) 12814778e0beSJiri Pirko { 12824778e0beSJiri Pirko return *(s16 *) nla_data(nla); 12834778e0beSJiri Pirko } 12844778e0beSJiri Pirko 12854778e0beSJiri Pirko /** 12864778e0beSJiri Pirko * nla_get_s8 - return payload of s8 attribute 12874778e0beSJiri Pirko * @nla: s8 netlink attribute 12884778e0beSJiri Pirko */ 12894778e0beSJiri Pirko static inline s8 nla_get_s8(const struct nlattr *nla) 12904778e0beSJiri Pirko { 12914778e0beSJiri Pirko return *(s8 *) nla_data(nla); 12924778e0beSJiri Pirko } 12934778e0beSJiri Pirko 12944778e0beSJiri Pirko /** 12954778e0beSJiri Pirko * nla_get_s64 - return payload of s64 attribute 12964778e0beSJiri Pirko * @nla: s64 netlink attribute 12974778e0beSJiri Pirko */ 12984778e0beSJiri Pirko static inline s64 nla_get_s64(const struct nlattr *nla) 12994778e0beSJiri Pirko { 13004778e0beSJiri Pirko s64 tmp; 13014778e0beSJiri Pirko 13024778e0beSJiri Pirko nla_memcpy(&tmp, nla, sizeof(tmp)); 13034778e0beSJiri Pirko 13044778e0beSJiri Pirko return tmp; 13054778e0beSJiri Pirko } 13064778e0beSJiri Pirko 13074778e0beSJiri Pirko /** 1308bfa83a9eSThomas Graf * nla_get_flag - return payload of flag attribute 1309bfa83a9eSThomas Graf * @nla: flag netlink attribute 1310bfa83a9eSThomas Graf */ 1311b057efd4SPatrick McHardy static inline int nla_get_flag(const struct nlattr *nla) 1312bfa83a9eSThomas Graf { 1313bfa83a9eSThomas Graf return !!nla; 1314bfa83a9eSThomas Graf } 1315bfa83a9eSThomas Graf 1316bfa83a9eSThomas Graf /** 1317bfa83a9eSThomas Graf * nla_get_msecs - return payload of msecs attribute 1318bfa83a9eSThomas Graf * @nla: msecs netlink attribute 1319bfa83a9eSThomas Graf * 1320bfa83a9eSThomas Graf * Returns the number of milliseconds in jiffies. 1321bfa83a9eSThomas Graf */ 1322b057efd4SPatrick McHardy static inline unsigned long nla_get_msecs(const struct nlattr *nla) 1323bfa83a9eSThomas Graf { 1324bfa83a9eSThomas Graf u64 msecs = nla_get_u64(nla); 1325bfa83a9eSThomas Graf 1326bfa83a9eSThomas Graf return msecs_to_jiffies((unsigned long) msecs); 1327bfa83a9eSThomas Graf } 1328bfa83a9eSThomas Graf 1329bfa83a9eSThomas Graf /** 133067b61f6cSJiri Benc * nla_get_in_addr - return payload of IPv4 address attribute 133167b61f6cSJiri Benc * @nla: IPv4 address netlink attribute 133267b61f6cSJiri Benc */ 133367b61f6cSJiri Benc static inline __be32 nla_get_in_addr(const struct nlattr *nla) 133467b61f6cSJiri Benc { 133567b61f6cSJiri Benc return *(__be32 *) nla_data(nla); 133667b61f6cSJiri Benc } 133767b61f6cSJiri Benc 133867b61f6cSJiri Benc /** 133967b61f6cSJiri Benc * nla_get_in6_addr - return payload of IPv6 address attribute 134067b61f6cSJiri Benc * @nla: IPv6 address netlink attribute 134167b61f6cSJiri Benc */ 134267b61f6cSJiri Benc static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla) 134367b61f6cSJiri Benc { 134467b61f6cSJiri Benc struct in6_addr tmp; 134567b61f6cSJiri Benc 134667b61f6cSJiri Benc nla_memcpy(&tmp, nla, sizeof(tmp)); 134767b61f6cSJiri Benc return tmp; 134867b61f6cSJiri Benc } 134967b61f6cSJiri Benc 135067b61f6cSJiri Benc /** 135164c83d83SJamal Hadi Salim * nla_get_bitfield32 - return payload of 32 bitfield attribute 135264c83d83SJamal Hadi Salim * @nla: nla_bitfield32 attribute 135364c83d83SJamal Hadi Salim */ 135464c83d83SJamal Hadi Salim static inline struct nla_bitfield32 nla_get_bitfield32(const struct nlattr *nla) 135564c83d83SJamal Hadi Salim { 135664c83d83SJamal Hadi Salim struct nla_bitfield32 tmp; 135764c83d83SJamal Hadi Salim 135864c83d83SJamal Hadi Salim nla_memcpy(&tmp, nla, sizeof(tmp)); 135964c83d83SJamal Hadi Salim return tmp; 136064c83d83SJamal Hadi Salim } 136164c83d83SJamal Hadi Salim 136264c83d83SJamal Hadi Salim /** 1363b15ca182SThomas Graf * nla_memdup - duplicate attribute memory (kmemdup) 1364b15ca182SThomas Graf * @src: netlink attribute to duplicate from 1365b15ca182SThomas Graf * @gfp: GFP mask 1366b15ca182SThomas Graf */ 1367b15ca182SThomas Graf static inline void *nla_memdup(const struct nlattr *src, gfp_t gfp) 1368b15ca182SThomas Graf { 1369b15ca182SThomas Graf return kmemdup(nla_data(src), nla_len(src), gfp); 1370b15ca182SThomas Graf } 1371b15ca182SThomas Graf 1372b15ca182SThomas Graf /** 1373bfa83a9eSThomas Graf * nla_nest_start - Start a new level of nested attributes 1374bfa83a9eSThomas Graf * @skb: socket buffer to add attributes to 1375bfa83a9eSThomas Graf * @attrtype: attribute type of container 1376bfa83a9eSThomas Graf * 1377bfa83a9eSThomas Graf * Returns the container attribute 1378bfa83a9eSThomas Graf */ 1379bfa83a9eSThomas Graf static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) 1380bfa83a9eSThomas Graf { 138127a884dcSArnaldo Carvalho de Melo struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); 1382bfa83a9eSThomas Graf 1383bfa83a9eSThomas Graf if (nla_put(skb, attrtype, 0, NULL) < 0) 1384bfa83a9eSThomas Graf return NULL; 1385bfa83a9eSThomas Graf 1386bfa83a9eSThomas Graf return start; 1387bfa83a9eSThomas Graf } 1388bfa83a9eSThomas Graf 1389bfa83a9eSThomas Graf /** 1390bfa83a9eSThomas Graf * nla_nest_end - Finalize nesting of attributes 1391d1ec3b77SPierre Ynard * @skb: socket buffer the attributes are stored in 1392bfa83a9eSThomas Graf * @start: container attribute 1393bfa83a9eSThomas Graf * 1394bfa83a9eSThomas Graf * Corrects the container attribute header to include the all 1395bfa83a9eSThomas Graf * appeneded attributes. 1396bfa83a9eSThomas Graf * 1397bfa83a9eSThomas Graf * Returns the total data length of the skb. 1398bfa83a9eSThomas Graf */ 1399bfa83a9eSThomas Graf static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) 1400bfa83a9eSThomas Graf { 140127a884dcSArnaldo Carvalho de Melo start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; 1402bfa83a9eSThomas Graf return skb->len; 1403bfa83a9eSThomas Graf } 1404bfa83a9eSThomas Graf 1405bfa83a9eSThomas Graf /** 1406bfa83a9eSThomas Graf * nla_nest_cancel - Cancel nesting of attributes 1407bfa83a9eSThomas Graf * @skb: socket buffer the message is stored in 1408bfa83a9eSThomas Graf * @start: container attribute 1409bfa83a9eSThomas Graf * 1410bfa83a9eSThomas Graf * Removes the container attribute and including all nested 1411bc3ed28cSThomas Graf * attributes. Returns -EMSGSIZE 1412bfa83a9eSThomas Graf */ 1413bc3ed28cSThomas Graf static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) 1414bfa83a9eSThomas Graf { 1415bc3ed28cSThomas Graf nlmsg_trim(skb, start); 1416bfa83a9eSThomas Graf } 1417bfa83a9eSThomas Graf 1418bfa83a9eSThomas Graf /** 14194fe5d5c0SPaul Moore * nla_validate_nested - Validate a stream of nested attributes 14204fe5d5c0SPaul Moore * @start: container attribute 14214fe5d5c0SPaul Moore * @maxtype: maximum attribute type to be expected 14224fe5d5c0SPaul Moore * @policy: validation policy 1423fceb6435SJohannes Berg * @extack: extended ACK report struct 14244fe5d5c0SPaul Moore * 14254fe5d5c0SPaul Moore * Validates all attributes in the nested attribute stream against the 14264fe5d5c0SPaul Moore * specified policy. Attributes with a type exceeding maxtype will be 14274fe5d5c0SPaul Moore * ignored. See documenation of struct nla_policy for more details. 14284fe5d5c0SPaul Moore * 14294fe5d5c0SPaul Moore * Returns 0 on success or a negative error code. 14304fe5d5c0SPaul Moore */ 14313654654fSJan Engelhardt static inline int nla_validate_nested(const struct nlattr *start, int maxtype, 1432fceb6435SJohannes Berg const struct nla_policy *policy, 1433fceb6435SJohannes Berg struct netlink_ext_ack *extack) 14344fe5d5c0SPaul Moore { 1435fceb6435SJohannes Berg return nla_validate(nla_data(start), nla_len(start), maxtype, policy, 1436fceb6435SJohannes Berg extack); 14374fe5d5c0SPaul Moore } 14384fe5d5c0SPaul Moore 14394fe5d5c0SPaul Moore /** 1440089bf1a6SNicolas Dichtel * nla_need_padding_for_64bit - test 64-bit alignment of the next attribute 1441089bf1a6SNicolas Dichtel * @skb: socket buffer the message is stored in 1442089bf1a6SNicolas Dichtel * 1443089bf1a6SNicolas Dichtel * Return true if padding is needed to align the next attribute (nla_data()) to 1444089bf1a6SNicolas Dichtel * a 64-bit aligned area. 1445089bf1a6SNicolas Dichtel */ 1446089bf1a6SNicolas Dichtel static inline bool nla_need_padding_for_64bit(struct sk_buff *skb) 1447089bf1a6SNicolas Dichtel { 1448089bf1a6SNicolas Dichtel #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 1449089bf1a6SNicolas Dichtel /* The nlattr header is 4 bytes in size, that's why we test 1450089bf1a6SNicolas Dichtel * if the skb->data _is_ aligned. A NOP attribute, plus 1451089bf1a6SNicolas Dichtel * nlattr header for next attribute, will make nla_data() 1452089bf1a6SNicolas Dichtel * 8-byte aligned. 1453089bf1a6SNicolas Dichtel */ 1454089bf1a6SNicolas Dichtel if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8)) 1455089bf1a6SNicolas Dichtel return true; 1456089bf1a6SNicolas Dichtel #endif 1457089bf1a6SNicolas Dichtel return false; 1458089bf1a6SNicolas Dichtel } 1459089bf1a6SNicolas Dichtel 1460089bf1a6SNicolas Dichtel /** 146135c58459SDavid S. Miller * nla_align_64bit - 64-bit align the nla_data() of next attribute 146235c58459SDavid S. Miller * @skb: socket buffer the message is stored in 146335c58459SDavid S. Miller * @padattr: attribute type for the padding 146435c58459SDavid S. Miller * 146535c58459SDavid S. Miller * Conditionally emit a padding netlink attribute in order to make 146635c58459SDavid S. Miller * the next attribute we emit have a 64-bit aligned nla_data() area. 146735c58459SDavid S. Miller * This will only be done in architectures which do not have 1468cca1d815SEric Dumazet * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined. 146935c58459SDavid S. Miller * 147035c58459SDavid S. Miller * Returns zero on success or a negative error code. 147135c58459SDavid S. Miller */ 147235c58459SDavid S. Miller static inline int nla_align_64bit(struct sk_buff *skb, int padattr) 147335c58459SDavid S. Miller { 1474089bf1a6SNicolas Dichtel if (nla_need_padding_for_64bit(skb) && 1475cca1d815SEric Dumazet !nla_reserve(skb, padattr, 0)) 147635c58459SDavid S. Miller return -EMSGSIZE; 1477089bf1a6SNicolas Dichtel 147835c58459SDavid S. Miller return 0; 147935c58459SDavid S. Miller } 148035c58459SDavid S. Miller 148135c58459SDavid S. Miller /** 148235c58459SDavid S. Miller * nla_total_size_64bit - total length of attribute including padding 148335c58459SDavid S. Miller * @payload: length of payload 148435c58459SDavid S. Miller */ 148535c58459SDavid S. Miller static inline int nla_total_size_64bit(int payload) 148635c58459SDavid S. Miller { 148735c58459SDavid S. Miller return NLA_ALIGN(nla_attr_size(payload)) 1488cca1d815SEric Dumazet #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 148935c58459SDavid S. Miller + NLA_ALIGN(nla_attr_size(0)) 149035c58459SDavid S. Miller #endif 149135c58459SDavid S. Miller ; 149235c58459SDavid S. Miller } 149335c58459SDavid S. Miller 149435c58459SDavid S. Miller /** 1495bfa83a9eSThomas Graf * nla_for_each_attr - iterate over a stream of attributes 1496bfa83a9eSThomas Graf * @pos: loop counter, set to current attribute 1497bfa83a9eSThomas Graf * @head: head of attribute stream 1498bfa83a9eSThomas Graf * @len: length of attribute stream 1499bfa83a9eSThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 1500bfa83a9eSThomas Graf */ 1501bfa83a9eSThomas Graf #define nla_for_each_attr(pos, head, len, rem) \ 1502bfa83a9eSThomas Graf for (pos = head, rem = len; \ 1503bfa83a9eSThomas Graf nla_ok(pos, rem); \ 1504bfa83a9eSThomas Graf pos = nla_next(pos, &(rem))) 1505bfa83a9eSThomas Graf 1506fe4944e5SThomas Graf /** 1507fe4944e5SThomas Graf * nla_for_each_nested - iterate over nested attributes 1508fe4944e5SThomas Graf * @pos: loop counter, set to current attribute 1509fe4944e5SThomas Graf * @nla: attribute containing the nested attributes 1510fe4944e5SThomas Graf * @rem: initialized to len, holds bytes currently remaining in stream 1511fe4944e5SThomas Graf */ 1512fe4944e5SThomas Graf #define nla_for_each_nested(pos, nla, rem) \ 1513fe4944e5SThomas Graf nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) 1514fe4944e5SThomas Graf 1515941d8ebcSSimon Horman /** 1516941d8ebcSSimon Horman * nla_is_last - Test if attribute is last in stream 1517941d8ebcSSimon Horman * @nla: attribute to test 1518941d8ebcSSimon Horman * @rem: bytes remaining in stream 1519941d8ebcSSimon Horman */ 1520941d8ebcSSimon Horman static inline bool nla_is_last(const struct nlattr *nla, int rem) 1521941d8ebcSSimon Horman { 1522941d8ebcSSimon Horman return nla->nla_len == rem; 1523941d8ebcSSimon Horman } 1524941d8ebcSSimon Horman 1525bfa83a9eSThomas Graf #endif 1526