diff options
Diffstat (limited to 'include/net/netlink.h')
| -rw-r--r-- | include/net/netlink.h | 182 |
1 files changed, 161 insertions, 21 deletions
diff --git a/include/net/netlink.h b/include/net/netlink.h index 8a7cd1170e1f..db6af207287c 100644 --- a/include/net/netlink.h +++ b/include/net/netlink.h @@ -41,7 +41,8 @@ * nlmsg_get_pos() return current position in message * nlmsg_trim() trim part of message * nlmsg_cancel() cancel message construction - * nlmsg_free() free a netlink message + * nlmsg_consume() free a netlink message (expected) + * nlmsg_free() free a netlink message (drop) * * Message Sending: * nlmsg_multicast() multicast message to several groups @@ -128,6 +129,8 @@ * nla_len(nla) length of attribute payload * * Attribute Payload Access for Basic Types: + * nla_get_uint(nla) get payload for a uint attribute + * nla_get_sint(nla) get payload for a sint attribute * nla_get_u8(nla) get payload for a u8 attribute * nla_get_u16(nla) get payload for a u16 attribute * nla_get_u32(nla) get payload for a u32 attribute @@ -155,7 +158,11 @@ * nla_parse() parse and validate stream of attrs * nla_parse_nested() parse nested attributes * nla_for_each_attr() loop over all attributes + * nla_for_each_attr_type() loop over all attributes with the + * given type * nla_for_each_nested() loop over the nested attributes + * nla_for_each_nested_type() loop over the nested attributes with + * the given type *========================================================================= */ @@ -183,6 +190,8 @@ enum { NLA_REJECT, NLA_BE16, NLA_BE32, + NLA_SINT, + NLA_UINT, __NLA_TYPE_MAX, }; @@ -229,6 +238,7 @@ enum nla_policy_validation { * nested header (or empty); len field is used if * nested_policy is also used, for the max attr * number in the nested policy. + * NLA_SINT, NLA_UINT, * NLA_U8, NLA_U16, * NLA_U32, NLA_U64, * NLA_S8, NLA_S16, @@ -260,12 +270,14 @@ enum nla_policy_validation { * while an array has the nested attributes at another * level down and the attribute types directly in the * nesting don't matter. + * NLA_UINT, * NLA_U8, * NLA_U16, * NLA_U32, * NLA_U64, * NLA_BE16, * NLA_BE32, + * NLA_SINT, * NLA_S8, * NLA_S16, * NLA_S32, @@ -280,6 +292,7 @@ enum nla_policy_validation { * or NLA_POLICY_FULL_RANGE_SIGNED() macros instead. * Use the NLA_POLICY_MIN(), NLA_POLICY_MAX() and * NLA_POLICY_RANGE() macros. + * NLA_UINT, * NLA_U8, * NLA_U16, * NLA_U32, @@ -288,6 +301,7 @@ enum nla_policy_validation { * to a struct netlink_range_validation that indicates * the min/max values. * Use NLA_POLICY_FULL_RANGE(). + * NLA_SINT, * NLA_S8, * NLA_S16, * NLA_S32, @@ -351,8 +365,8 @@ struct nla_policy { const u32 mask; const char *reject_message; const struct nla_policy *nested_policy; - struct netlink_range_validation *range; - struct netlink_range_validation_signed *range_signed; + const struct netlink_range_validation *range; + const struct netlink_range_validation_signed *range_signed; struct { s16 min, max; }; @@ -377,9 +391,11 @@ struct nla_policy { #define __NLA_IS_UINT_TYPE(tp) \ (tp == NLA_U8 || tp == NLA_U16 || tp == NLA_U32 || \ - tp == NLA_U64 || tp == NLA_BE16 || tp == NLA_BE32) + tp == NLA_U64 || tp == NLA_UINT || \ + tp == NLA_BE16 || tp == NLA_BE32) #define __NLA_IS_SINT_TYPE(tp) \ - (tp == NLA_S8 || tp == NLA_S16 || tp == NLA_S32 || tp == NLA_S64) + (tp == NLA_S8 || tp == NLA_S16 || tp == NLA_S32 || tp == NLA_S64 || \ + tp == NLA_SINT) #define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition)) #define NLA_ENSURE_UINT_TYPE(tp) \ @@ -811,7 +827,7 @@ nlmsg_parse_deprecated_strict(const struct nlmsghdr *nlh, int hdrlen, /** * nlmsg_find_attr - find a specific attribute in a netlink message * @nlh: netlink message header - * @hdrlen: length of familiy specific header + * @hdrlen: length of family specific header * @attrtype: type of attribute to look for * * Returns the first attribute which matches the specified type. @@ -833,7 +849,7 @@ static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, * * Validates all attributes in the specified attribute stream against the * specified policy. Validation is done in liberal mode. - * See documenation of struct nla_policy for more details. + * See documentation of struct nla_policy for more details. * * Returns 0 on success or a negative error code. */ @@ -856,7 +872,7 @@ static inline int nla_validate_deprecated(const struct nlattr *head, int len, * * Validates all attributes in the specified attribute stream against the * specified policy. Validation is done in strict mode. - * See documenation of struct nla_policy for more details. + * See documentation of struct nla_policy for more details. * * Returns 0 on success or a negative error code. */ @@ -871,7 +887,7 @@ static inline int nla_validate(const struct nlattr *head, int len, int maxtype, /** * nlmsg_validate_deprecated - validate a netlink message including attributes * @nlh: netlinket message header - * @hdrlen: length of familiy specific header + * @hdrlen: length of family specific header * @maxtype: maximum attribute type to be expected * @policy: validation policy * @extack: extended ACK report struct @@ -917,7 +933,7 @@ static inline u32 nlmsg_seq(const struct nlmsghdr *nlh) * nlmsg_for_each_attr - iterate over a stream of attributes * @pos: loop counter, set to current attribute * @nlh: netlink message header - * @hdrlen: length of familiy specific header + * @hdrlen: length of family specific header * @rem: initialized to len, holds bytes currently remaining in stream */ #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ @@ -1000,11 +1016,25 @@ static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) } /** + * nlmsg_new_large - Allocate a new netlink message with non-contiguous + * physical memory + * @payload: size of the message payload + * + * The allocated skb is unable to have frag page for shinfo->frags*, + * as the NULL setting for skb->head in netlink_skb_destructor() will + * bypass most of the handling in skb_release_data() + */ +static inline struct sk_buff *nlmsg_new_large(size_t payload) +{ + return netlink_alloc_large_skb(nlmsg_total_size(payload), 0); +} + +/** * nlmsg_end - Finalize a netlink message * @skb: socket buffer the message is stored in * @nlh: netlink message header * - * Corrects the netlink message header to include the appeneded + * Corrects the netlink message header to include the appended * attributes. Only necessary if attributes have been added to * the message. */ @@ -1053,7 +1083,7 @@ static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) } /** - * nlmsg_free - free a netlink message + * nlmsg_free - drop a netlink message * @skb: socket buffer of netlink message */ static inline void nlmsg_free(struct sk_buff *skb) @@ -1062,21 +1092,38 @@ static inline void nlmsg_free(struct sk_buff *skb) } /** - * nlmsg_multicast - multicast a netlink message + * nlmsg_consume - free a netlink message + * @skb: socket buffer of netlink message + */ +static inline void nlmsg_consume(struct sk_buff *skb) +{ + consume_skb(skb); +} + +/** + * nlmsg_multicast_filtered - multicast a netlink message with filter function * @sk: netlink socket to spread messages to * @skb: netlink message as socket buffer * @portid: own netlink portid to avoid sending to yourself * @group: multicast group id * @flags: allocation flags + * @filter: filter function + * @filter_data: filter function private data + * + * Return: 0 on success, negative error code for failure. */ -static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, - u32 portid, unsigned int group, gfp_t flags) +static inline int nlmsg_multicast_filtered(struct sock *sk, struct sk_buff *skb, + u32 portid, unsigned int group, + gfp_t flags, + netlink_filter_fn filter, + void *filter_data) { int err; NETLINK_CB(skb).dst_group = group; - err = netlink_broadcast(sk, skb, portid, group, flags); + err = netlink_broadcast_filtered(sk, skb, portid, group, flags, + filter, filter_data); if (err > 0) err = 0; @@ -1084,6 +1131,21 @@ static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, } /** + * nlmsg_multicast - multicast a netlink message + * @sk: netlink socket to spread messages to + * @skb: netlink message as socket buffer + * @portid: own netlink portid to avoid sending to yourself + * @group: multicast group id + * @flags: allocation flags + */ +static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, + u32 portid, unsigned int group, gfp_t flags) +{ + return nlmsg_multicast_filtered(sk, skb, portid, group, flags, + NULL, NULL); +} + +/** * nlmsg_unicast - unicast a netlink message * @sk: netlink socket to spread message to * @skb: netlink message as socket buffer @@ -1189,7 +1251,7 @@ static inline void *nla_data(const struct nlattr *nla) * nla_len - length of payload * @nla: netlink attribute */ -static inline int nla_len(const struct nlattr *nla) +static inline u16 nla_len(const struct nlattr *nla) { return nla->nla_len - NLA_HDRLEN; } @@ -1358,6 +1420,22 @@ static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) } /** + * nla_put_uint - Add a variable-size unsigned int to a socket buffer + * @skb: socket buffer to add attribute to + * @attrtype: attribute type + * @value: numeric value + */ +static inline int nla_put_uint(struct sk_buff *skb, int attrtype, u64 value) +{ + u64 tmp64 = value; + u32 tmp32 = value; + + if (tmp64 == tmp32) + return nla_put_u32(skb, attrtype, tmp32); + return nla_put(skb, attrtype, sizeof(u64), &tmp64); +} + +/** * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer * @skb: socket buffer to add attribute to * @attrtype: attribute type @@ -1512,6 +1590,22 @@ static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value, } /** + * nla_put_sint - Add a variable-size signed int to a socket buffer + * @skb: socket buffer to add attribute to + * @attrtype: attribute type + * @value: numeric value + */ +static inline int nla_put_sint(struct sk_buff *skb, int attrtype, s64 value) +{ + s64 tmp64 = value; + s32 tmp32 = value; + + if (tmp64 == tmp32) + return nla_put_s32(skb, attrtype, tmp32); + return nla_put(skb, attrtype, sizeof(s64), &tmp64); +} + +/** * nla_put_string - Add a string netlink attribute to a socket buffer * @skb: socket buffer to add attribute to * @attrtype: attribute type @@ -1668,6 +1762,17 @@ static inline u64 nla_get_u64(const struct nlattr *nla) } /** + * nla_get_uint - return payload of uint attribute + * @nla: uint netlink attribute + */ +static inline u64 nla_get_uint(const struct nlattr *nla) +{ + if (nla_len(nla) == sizeof(u32)) + return nla_get_u32(nla); + return nla_get_u64(nla); +} + +/** * nla_get_be64 - return payload of __be64 attribute * @nla: __be64 netlink attribute */ @@ -1730,6 +1835,17 @@ static inline s64 nla_get_s64(const struct nlattr *nla) } /** + * nla_get_sint - return payload of uint attribute + * @nla: uint netlink attribute + */ +static inline s64 nla_get_sint(const struct nlattr *nla) +{ + if (nla_len(nla) == sizeof(s32)) + return nla_get_s32(nla); + return nla_get_s64(nla); +} + +/** * nla_get_flag - return payload of flag attribute * @nla: flag netlink attribute */ @@ -1789,10 +1905,11 @@ static inline struct nla_bitfield32 nla_get_bitfield32(const struct nlattr *nla) * @src: netlink attribute to duplicate from * @gfp: GFP mask */ -static inline void *nla_memdup(const struct nlattr *src, gfp_t gfp) +static inline void *nla_memdup_noprof(const struct nlattr *src, gfp_t gfp) { - return kmemdup(nla_data(src), nla_len(src), gfp); + return kmemdup_noprof(nla_data(src), nla_len(src), gfp); } +#define nla_memdup(...) alloc_hooks(nla_memdup_noprof(__VA_ARGS__)) /** * nla_nest_start_noflag - Start a new level of nested attributes @@ -1837,7 +1954,7 @@ static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) * @start: container attribute * * Corrects the container attribute header to include the all - * appeneded attributes. + * appended attributes. * * Returns the total data length of the skb. */ @@ -1870,7 +1987,7 @@ static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) * * Validates all attributes in the nested attribute stream against the * specified policy. Attributes with a type exceeding maxtype will be - * ignored. See documenation of struct nla_policy for more details. + * ignored. See documentation of struct nla_policy for more details. * * Returns 0 on success or a negative error code. */ @@ -1969,6 +2086,18 @@ static inline int nla_total_size_64bit(int payload) pos = nla_next(pos, &(rem))) /** + * nla_for_each_attr_type - iterate over a stream of attributes + * @pos: loop counter, set to current attribute + * @type: required attribute type for @pos + * @head: head of attribute stream + * @len: length of attribute stream + * @rem: initialized to len, holds bytes currently remaining in stream + */ +#define nla_for_each_attr_type(pos, type, head, len, rem) \ + nla_for_each_attr(pos, head, len, rem) \ + if (nla_type(pos) == type) + +/** * nla_for_each_nested - iterate over nested attributes * @pos: loop counter, set to current attribute * @nla: attribute containing the nested attributes @@ -1978,6 +2107,17 @@ static inline int nla_total_size_64bit(int payload) nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) /** + * nla_for_each_nested_type - iterate over nested attributes + * @pos: loop counter, set to current attribute + * @type: required attribute type for @pos + * @nla: attribute containing the nested attributes + * @rem: initialized to len, holds bytes currently remaining in stream + */ +#define nla_for_each_nested_type(pos, type, nla, rem) \ + nla_for_each_nested(pos, nla, rem) \ + if (nla_type(pos) == type) + +/** * nla_is_last - Test if attribute is last in stream * @nla: attribute to test * @rem: bytes remaining in stream |