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1343 lines
39 KiB
1343 lines
39 KiB
#ifndef __NET_NETLINK_H |
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#define __NET_NETLINK_H |
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|
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#include <linux/types.h> |
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#include <linux/netlink.h> |
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#include <linux/jiffies.h> |
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#include <linux/in6.h> |
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|
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/* ======================================================================== |
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* Netlink Messages and Attributes Interface (As Seen On TV) |
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* ------------------------------------------------------------------------ |
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* Messages Interface |
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* ------------------------------------------------------------------------ |
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* |
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* Message Format: |
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* <--- nlmsg_total_size(payload) ---> |
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* <-- nlmsg_msg_size(payload) -> |
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* +----------+- - -+-------------+- - -+-------- - - |
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* | nlmsghdr | Pad | Payload | Pad | nlmsghdr |
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* +----------+- - -+-------------+- - -+-------- - - |
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* nlmsg_data(nlh)---^ ^ |
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* nlmsg_next(nlh)-----------------------+ |
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* |
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* Payload Format: |
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* <---------------------- nlmsg_len(nlh) ---------------------> |
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* <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) -> |
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* +----------------------+- - -+--------------------------------+ |
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* | Family Header | Pad | Attributes | |
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* +----------------------+- - -+--------------------------------+ |
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* nlmsg_attrdata(nlh, hdrlen)---^ |
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* |
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* Data Structures: |
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* struct nlmsghdr netlink message header |
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* |
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* Message Construction: |
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* nlmsg_new() create a new netlink message |
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* nlmsg_put() add a netlink message to an skb |
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* nlmsg_put_answer() callback based nlmsg_put() |
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* nlmsg_end() finalize netlink message |
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* nlmsg_get_pos() return current position in message |
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* nlmsg_trim() trim part of message |
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* nlmsg_cancel() cancel message construction |
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* nlmsg_free() free a netlink message |
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* |
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* Message Sending: |
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* nlmsg_multicast() multicast message to several groups |
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* nlmsg_unicast() unicast a message to a single socket |
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* nlmsg_notify() send notification message |
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* |
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* Message Length Calculations: |
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* nlmsg_msg_size(payload) length of message w/o padding |
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* nlmsg_total_size(payload) length of message w/ padding |
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* nlmsg_padlen(payload) length of padding at tail |
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* |
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* Message Payload Access: |
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* nlmsg_data(nlh) head of message payload |
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* nlmsg_len(nlh) length of message payload |
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* nlmsg_attrdata(nlh, hdrlen) head of attributes data |
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* nlmsg_attrlen(nlh, hdrlen) length of attributes data |
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* |
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* Message Parsing: |
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* nlmsg_ok(nlh, remaining) does nlh fit into remaining bytes? |
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* nlmsg_next(nlh, remaining) get next netlink message |
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* nlmsg_parse() parse attributes of a message |
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* nlmsg_find_attr() find an attribute in a message |
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* nlmsg_for_each_msg() loop over all messages |
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* nlmsg_validate() validate netlink message incl. attrs |
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* nlmsg_for_each_attr() loop over all attributes |
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* |
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* Misc: |
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* nlmsg_report() report back to application? |
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* |
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* ------------------------------------------------------------------------ |
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* Attributes Interface |
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* ------------------------------------------------------------------------ |
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* |
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* Attribute Format: |
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* <------- nla_total_size(payload) -------> |
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* <---- nla_attr_size(payload) -----> |
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* +----------+- - -+- - - - - - - - - +- - -+-------- - - |
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* | Header | Pad | Payload | Pad | Header |
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* +----------+- - -+- - - - - - - - - +- - -+-------- - - |
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* <- nla_len(nla) -> ^ |
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* nla_data(nla)----^ | |
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* nla_next(nla)-----------------------------' |
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* |
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* Data Structures: |
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* struct nlattr netlink attribute header |
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* |
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* Attribute Construction: |
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* nla_reserve(skb, type, len) reserve room for an attribute |
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* nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr |
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* nla_put(skb, type, len, data) add attribute to skb |
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* nla_put_nohdr(skb, len, data) add attribute w/o hdr |
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* nla_append(skb, len, data) append data to skb |
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* |
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* Attribute Construction for Basic Types: |
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* nla_put_u8(skb, type, value) add u8 attribute to skb |
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* nla_put_u16(skb, type, value) add u16 attribute to skb |
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* nla_put_u32(skb, type, value) add u32 attribute to skb |
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* nla_put_u64_64bits(skb, type, |
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* value, padattr) add u64 attribute to skb |
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* nla_put_s8(skb, type, value) add s8 attribute to skb |
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* nla_put_s16(skb, type, value) add s16 attribute to skb |
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* nla_put_s32(skb, type, value) add s32 attribute to skb |
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* nla_put_s64(skb, type, value, |
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* padattr) add s64 attribute to skb |
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* nla_put_string(skb, type, str) add string attribute to skb |
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* nla_put_flag(skb, type) add flag attribute to skb |
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* nla_put_msecs(skb, type, jiffies, |
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* padattr) add msecs attribute to skb |
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* nla_put_in_addr(skb, type, addr) add IPv4 address attribute to skb |
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* nla_put_in6_addr(skb, type, addr) add IPv6 address attribute to skb |
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* |
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* Nested Attributes Construction: |
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* nla_nest_start(skb, type) start a nested attribute |
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* nla_nest_end(skb, nla) finalize a nested attribute |
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* nla_nest_cancel(skb, nla) cancel nested attribute construction |
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* |
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* Attribute Length Calculations: |
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* nla_attr_size(payload) length of attribute w/o padding |
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* nla_total_size(payload) length of attribute w/ padding |
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* nla_padlen(payload) length of padding |
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* |
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* Attribute Payload Access: |
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* nla_data(nla) head of attribute payload |
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* nla_len(nla) length of attribute payload |
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* |
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* Attribute Payload Access for Basic Types: |
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* nla_get_u8(nla) get payload for a u8 attribute |
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* nla_get_u16(nla) get payload for a u16 attribute |
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* nla_get_u32(nla) get payload for a u32 attribute |
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* nla_get_u64(nla) get payload for a u64 attribute |
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* nla_get_s8(nla) get payload for a s8 attribute |
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* nla_get_s16(nla) get payload for a s16 attribute |
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* nla_get_s32(nla) get payload for a s32 attribute |
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* nla_get_s64(nla) get payload for a s64 attribute |
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* nla_get_flag(nla) return 1 if flag is true |
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* nla_get_msecs(nla) get payload for a msecs attribute |
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* |
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* Attribute Misc: |
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* nla_memcpy(dest, nla, count) copy attribute into memory |
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* nla_memcmp(nla, data, size) compare attribute with memory area |
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* nla_strlcpy(dst, nla, size) copy attribute to a sized string |
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* nla_strcmp(nla, str) compare attribute with string |
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* |
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* Attribute Parsing: |
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* nla_ok(nla, remaining) does nla fit into remaining bytes? |
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* nla_next(nla, remaining) get next netlink attribute |
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* nla_validate() validate a stream of attributes |
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* nla_validate_nested() validate a stream of nested attributes |
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* nla_find() find attribute in stream of attributes |
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* nla_find_nested() find attribute in nested attributes |
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* nla_parse() parse and validate stream of attrs |
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* nla_parse_nested() parse nested attribuets |
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* nla_for_each_attr() loop over all attributes |
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* nla_for_each_nested() loop over the nested attributes |
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*========================================================================= |
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*/ |
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/** |
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* Standard attribute types to specify validation policy |
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*/ |
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enum { |
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NLA_UNSPEC, |
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NLA_U8, |
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NLA_U16, |
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NLA_U32, |
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NLA_U64, |
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NLA_STRING, |
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NLA_FLAG, |
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NLA_MSECS, |
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NLA_NESTED, |
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NLA_NESTED_COMPAT, |
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NLA_NUL_STRING, |
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NLA_BINARY, |
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NLA_S8, |
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NLA_S16, |
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NLA_S32, |
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NLA_S64, |
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__NLA_TYPE_MAX, |
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}; |
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#define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) |
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/** |
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* struct nla_policy - attribute validation policy |
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* @type: Type of attribute or NLA_UNSPEC |
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* @len: Type specific length of payload |
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* |
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* Policies are defined as arrays of this struct, the array must be |
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* accessible by attribute type up to the highest identifier to be expected. |
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* |
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* Meaning of `len' field: |
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* NLA_STRING Maximum length of string |
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* NLA_NUL_STRING Maximum length of string (excluding NUL) |
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* NLA_FLAG Unused |
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* NLA_BINARY Maximum length of attribute payload |
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* NLA_NESTED Don't use `len' field -- length verification is |
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* done by checking len of nested header (or empty) |
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* NLA_NESTED_COMPAT Minimum length of structure payload |
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* NLA_U8, NLA_U16, |
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* NLA_U32, NLA_U64, |
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* NLA_S8, NLA_S16, |
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* NLA_S32, NLA_S64, |
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* NLA_MSECS Leaving the length field zero will verify the |
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* given type fits, using it verifies minimum length |
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* just like "All other" |
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* All other Minimum length of attribute payload |
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* |
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* Example: |
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* static const struct nla_policy my_policy[ATTR_MAX+1] = { |
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* [ATTR_FOO] = { .type = NLA_U16 }, |
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* [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ }, |
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* [ATTR_BAZ] = { .len = sizeof(struct mystruct) }, |
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* }; |
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*/ |
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struct nla_policy { |
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u16 type; |
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u16 len; |
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}; |
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/** |
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* struct nl_info - netlink source information |
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* @nlh: Netlink message header of original request |
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* @portid: Netlink PORTID of requesting application |
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*/ |
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struct nl_info { |
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struct nlmsghdr *nlh; |
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struct net *nl_net; |
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u32 portid; |
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}; |
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int netlink_rcv_skb(struct sk_buff *skb, |
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int (*cb)(struct sk_buff *, struct nlmsghdr *)); |
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int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, |
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unsigned int group, int report, gfp_t flags); |
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int nla_validate(const struct nlattr *head, int len, int maxtype, |
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const struct nla_policy *policy); |
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int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head, |
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int len, const struct nla_policy *policy); |
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int nla_policy_len(const struct nla_policy *, int); |
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struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype); |
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size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize); |
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int nla_memcpy(void *dest, const struct nlattr *src, int count); |
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int nla_memcmp(const struct nlattr *nla, const void *data, size_t size); |
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int nla_strcmp(const struct nlattr *nla, const char *str); |
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struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); |
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struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, |
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int attrlen, int padattr); |
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void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen); |
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struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); |
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struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, |
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int attrlen, int padattr); |
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void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen); |
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void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, |
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const void *data); |
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void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, |
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const void *data, int padattr); |
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void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); |
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int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data); |
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int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, |
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const void *data, int padattr); |
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int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); |
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int nla_append(struct sk_buff *skb, int attrlen, const void *data); |
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/************************************************************************** |
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* Netlink Messages |
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**************************************************************************/ |
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/** |
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* nlmsg_msg_size - length of netlink message not including padding |
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* @payload: length of message payload |
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*/ |
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static inline int nlmsg_msg_size(int payload) |
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{ |
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return NLMSG_HDRLEN + payload; |
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} |
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/** |
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* nlmsg_total_size - length of netlink message including padding |
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* @payload: length of message payload |
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*/ |
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static inline int nlmsg_total_size(int payload) |
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{ |
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return NLMSG_ALIGN(nlmsg_msg_size(payload)); |
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} |
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/** |
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* nlmsg_padlen - length of padding at the message's tail |
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* @payload: length of message payload |
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*/ |
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static inline int nlmsg_padlen(int payload) |
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{ |
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return nlmsg_total_size(payload) - nlmsg_msg_size(payload); |
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} |
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/** |
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* nlmsg_data - head of message payload |
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* @nlh: netlink message header |
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*/ |
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static inline void *nlmsg_data(const struct nlmsghdr *nlh) |
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{ |
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return (unsigned char *) nlh + NLMSG_HDRLEN; |
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} |
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/** |
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* nlmsg_len - length of message payload |
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* @nlh: netlink message header |
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*/ |
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static inline int nlmsg_len(const struct nlmsghdr *nlh) |
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{ |
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return nlh->nlmsg_len - NLMSG_HDRLEN; |
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} |
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/** |
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* nlmsg_attrdata - head of attributes data |
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* @nlh: netlink message header |
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* @hdrlen: length of family specific header |
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*/ |
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static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, |
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int hdrlen) |
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{ |
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unsigned char *data = nlmsg_data(nlh); |
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return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); |
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} |
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/** |
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* nlmsg_attrlen - length of attributes data |
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* @nlh: netlink message header |
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* @hdrlen: length of family specific header |
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*/ |
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static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) |
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{ |
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return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); |
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} |
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/** |
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* nlmsg_ok - check if the netlink message fits into the remaining bytes |
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* @nlh: netlink message header |
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* @remaining: number of bytes remaining in message stream |
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*/ |
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static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) |
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{ |
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return (remaining >= (int) sizeof(struct nlmsghdr) && |
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nlh->nlmsg_len >= sizeof(struct nlmsghdr) && |
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nlh->nlmsg_len <= remaining); |
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} |
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/** |
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* nlmsg_next - next netlink message in message stream |
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* @nlh: netlink message header |
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* @remaining: number of bytes remaining in message stream |
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* |
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* Returns the next netlink message in the message stream and |
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* decrements remaining by the size of the current message. |
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*/ |
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static inline struct nlmsghdr * |
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nlmsg_next(const struct nlmsghdr *nlh, int *remaining) |
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{ |
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int totlen = NLMSG_ALIGN(nlh->nlmsg_len); |
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*remaining -= totlen; |
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return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); |
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} |
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/** |
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* nlmsg_parse - parse attributes of a netlink message |
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* @nlh: netlink message header |
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* @hdrlen: length of family specific header |
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* @tb: destination array with maxtype+1 elements |
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* @maxtype: maximum attribute type to be expected |
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* @policy: validation policy |
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* |
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* See nla_parse() |
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*/ |
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static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, |
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struct nlattr *tb[], int maxtype, |
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const struct nla_policy *policy) |
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{ |
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if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) |
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return -EINVAL; |
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return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), |
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nlmsg_attrlen(nlh, hdrlen), policy); |
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} |
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/** |
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* nlmsg_find_attr - find a specific attribute in a netlink message |
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* @nlh: netlink message header |
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* @hdrlen: length of familiy specific header |
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* @attrtype: type of attribute to look for |
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* |
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* Returns the first attribute which matches the specified type. |
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*/ |
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static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, |
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int hdrlen, int attrtype) |
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{ |
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return nla_find(nlmsg_attrdata(nlh, hdrlen), |
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nlmsg_attrlen(nlh, hdrlen), attrtype); |
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} |
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|
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/** |
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* nlmsg_validate - validate a netlink message including attributes |
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* @nlh: netlinket message header |
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* @hdrlen: length of familiy specific header |
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* @maxtype: maximum attribute type to be expected |
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* @policy: validation policy |
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*/ |
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static inline int nlmsg_validate(const struct nlmsghdr *nlh, |
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int hdrlen, int maxtype, |
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const struct nla_policy *policy) |
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{ |
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if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) |
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return -EINVAL; |
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|
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return nla_validate(nlmsg_attrdata(nlh, hdrlen), |
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nlmsg_attrlen(nlh, hdrlen), maxtype, policy); |
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} |
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|
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/** |
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* nlmsg_report - need to report back to application? |
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* @nlh: netlink message header |
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* |
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* Returns 1 if a report back to the application is requested. |
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*/ |
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static inline int nlmsg_report(const struct nlmsghdr *nlh) |
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{ |
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return !!(nlh->nlmsg_flags & NLM_F_ECHO); |
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} |
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|
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/** |
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* nlmsg_for_each_attr - iterate over a stream of attributes |
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* @pos: loop counter, set to current attribute |
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* @nlh: netlink message header |
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* @hdrlen: length of familiy specific header |
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* @rem: initialized to len, holds bytes currently remaining in stream |
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*/ |
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#define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ |
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nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ |
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nlmsg_attrlen(nlh, hdrlen), rem) |
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|
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/** |
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* nlmsg_put - Add a new netlink message to an skb |
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* @skb: socket buffer to store message in |
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* @portid: netlink PORTID of requesting application |
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* @seq: sequence number of message |
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* @type: message type |
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* @payload: length of message payload |
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* @flags: message flags |
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* |
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* Returns NULL if the tailroom of the skb is insufficient to store |
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* the message header and payload. |
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*/ |
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static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, |
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int type, int payload, int flags) |
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{ |
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if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) |
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return NULL; |
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|
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return __nlmsg_put(skb, portid, seq, type, payload, flags); |
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} |
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|
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/** |
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* nlmsg_put_answer - Add a new callback based netlink message to an skb |
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* @skb: socket buffer to store message in |
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* @cb: netlink callback |
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* @type: message type |
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* @payload: length of message payload |
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* @flags: message flags |
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* |
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* Returns NULL if the tailroom of the skb is insufficient to store |
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* the message header and payload. |
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*/ |
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static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, |
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struct netlink_callback *cb, |
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int type, int payload, |
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int flags) |
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{ |
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return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
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type, payload, flags); |
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} |
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|
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/** |
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* nlmsg_new - Allocate a new netlink message |
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* @payload: size of the message payload |
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* @flags: the type of memory to allocate. |
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* |
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* Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known |
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* and a good default is needed. |
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*/ |
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static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) |
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{ |
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return alloc_skb(nlmsg_total_size(payload), flags); |
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} |
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|
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/** |
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* nlmsg_end - Finalize a netlink message |
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* @skb: socket buffer the message is stored in |
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* @nlh: netlink message header |
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* |
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* Corrects the netlink message header to include the appeneded |
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* attributes. Only necessary if attributes have been added to |
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* the message. |
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*/ |
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static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) |
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{ |
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nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; |
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} |
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/** |
|
* nlmsg_get_pos - return current position in netlink message |
|
* @skb: socket buffer the message is stored in |
|
* |
|
* Returns a pointer to the current tail of the message. |
|
*/ |
|
static inline void *nlmsg_get_pos(struct sk_buff *skb) |
|
{ |
|
return skb_tail_pointer(skb); |
|
} |
|
|
|
/** |
|
* nlmsg_trim - Trim message to a mark |
|
* @skb: socket buffer the message is stored in |
|
* @mark: mark to trim to |
|
* |
|
* Trims the message to the provided mark. |
|
*/ |
|
static inline void nlmsg_trim(struct sk_buff *skb, const void *mark) |
|
{ |
|
if (mark) { |
|
WARN_ON((unsigned char *) mark < skb->data); |
|
skb_trim(skb, (const unsigned char *) mark - skb->data); |
|
} |
|
} |
|
|
|
/** |
|
* nlmsg_cancel - Cancel construction of a netlink message |
|
* @skb: socket buffer the message is stored in |
|
* @nlh: netlink message header |
|
* |
|
* Removes the complete netlink message including all |
|
* attributes from the socket buffer again. |
|
*/ |
|
static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) |
|
{ |
|
nlmsg_trim(skb, nlh); |
|
} |
|
|
|
/** |
|
* nlmsg_free - free a netlink message |
|
* @skb: socket buffer of netlink message |
|
*/ |
|
static inline void nlmsg_free(struct sk_buff *skb) |
|
{ |
|
kfree_skb(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) |
|
{ |
|
int err; |
|
|
|
NETLINK_CB(skb).dst_group = group; |
|
|
|
err = netlink_broadcast(sk, skb, portid, group, flags); |
|
if (err > 0) |
|
err = 0; |
|
|
|
return err; |
|
} |
|
|
|
/** |
|
* nlmsg_unicast - unicast a netlink message |
|
* @sk: netlink socket to spread message to |
|
* @skb: netlink message as socket buffer |
|
* @portid: netlink portid of the destination socket |
|
*/ |
|
static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid) |
|
{ |
|
int err; |
|
|
|
err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT); |
|
if (err > 0) |
|
err = 0; |
|
|
|
return err; |
|
} |
|
|
|
/** |
|
* nlmsg_for_each_msg - iterate over a stream of messages |
|
* @pos: loop counter, set to current message |
|
* @head: head of message stream |
|
* @len: length of message stream |
|
* @rem: initialized to len, holds bytes currently remaining in stream |
|
*/ |
|
#define nlmsg_for_each_msg(pos, head, len, rem) \ |
|
for (pos = head, rem = len; \ |
|
nlmsg_ok(pos, rem); \ |
|
pos = nlmsg_next(pos, &(rem))) |
|
|
|
/** |
|
* nl_dump_check_consistent - check if sequence is consistent and advertise if not |
|
* @cb: netlink callback structure that stores the sequence number |
|
* @nlh: netlink message header to write the flag to |
|
* |
|
* This function checks if the sequence (generation) number changed during dump |
|
* and if it did, advertises it in the netlink message header. |
|
* |
|
* The correct way to use it is to set cb->seq to the generation counter when |
|
* all locks for dumping have been acquired, and then call this function for |
|
* each message that is generated. |
|
* |
|
* Note that due to initialisation concerns, 0 is an invalid sequence number |
|
* and must not be used by code that uses this functionality. |
|
*/ |
|
static inline void |
|
nl_dump_check_consistent(struct netlink_callback *cb, |
|
struct nlmsghdr *nlh) |
|
{ |
|
if (cb->prev_seq && cb->seq != cb->prev_seq) |
|
nlh->nlmsg_flags |= NLM_F_DUMP_INTR; |
|
cb->prev_seq = cb->seq; |
|
} |
|
|
|
/************************************************************************** |
|
* Netlink Attributes |
|
**************************************************************************/ |
|
|
|
/** |
|
* nla_attr_size - length of attribute not including padding |
|
* @payload: length of payload |
|
*/ |
|
static inline int nla_attr_size(int payload) |
|
{ |
|
return NLA_HDRLEN + payload; |
|
} |
|
|
|
/** |
|
* nla_total_size - total length of attribute including padding |
|
* @payload: length of payload |
|
*/ |
|
static inline int nla_total_size(int payload) |
|
{ |
|
return NLA_ALIGN(nla_attr_size(payload)); |
|
} |
|
|
|
/** |
|
* nla_padlen - length of padding at the tail of attribute |
|
* @payload: length of payload |
|
*/ |
|
static inline int nla_padlen(int payload) |
|
{ |
|
return nla_total_size(payload) - nla_attr_size(payload); |
|
} |
|
|
|
/** |
|
* nla_type - attribute type |
|
* @nla: netlink attribute |
|
*/ |
|
static inline int nla_type(const struct nlattr *nla) |
|
{ |
|
return nla->nla_type & NLA_TYPE_MASK; |
|
} |
|
|
|
/** |
|
* nla_data - head of payload |
|
* @nla: netlink attribute |
|
*/ |
|
static inline void *nla_data(const struct nlattr *nla) |
|
{ |
|
return (char *) nla + NLA_HDRLEN; |
|
} |
|
|
|
/** |
|
* nla_len - length of payload |
|
* @nla: netlink attribute |
|
*/ |
|
static inline int nla_len(const struct nlattr *nla) |
|
{ |
|
return nla->nla_len - NLA_HDRLEN; |
|
} |
|
|
|
/** |
|
* nla_ok - check if the netlink attribute fits into the remaining bytes |
|
* @nla: netlink attribute |
|
* @remaining: number of bytes remaining in attribute stream |
|
*/ |
|
static inline int nla_ok(const struct nlattr *nla, int remaining) |
|
{ |
|
return remaining >= (int) sizeof(*nla) && |
|
nla->nla_len >= sizeof(*nla) && |
|
nla->nla_len <= remaining; |
|
} |
|
|
|
/** |
|
* nla_next - next netlink attribute in attribute stream |
|
* @nla: netlink attribute |
|
* @remaining: number of bytes remaining in attribute stream |
|
* |
|
* Returns the next netlink attribute in the attribute stream and |
|
* decrements remaining by the size of the current attribute. |
|
*/ |
|
static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) |
|
{ |
|
int totlen = NLA_ALIGN(nla->nla_len); |
|
|
|
*remaining -= totlen; |
|
return (struct nlattr *) ((char *) nla + totlen); |
|
} |
|
|
|
/** |
|
* nla_find_nested - find attribute in a set of nested attributes |
|
* @nla: attribute containing the nested attributes |
|
* @attrtype: type of attribute to look for |
|
* |
|
* Returns the first attribute which matches the specified type. |
|
*/ |
|
static inline struct nlattr * |
|
nla_find_nested(const struct nlattr *nla, int attrtype) |
|
{ |
|
return nla_find(nla_data(nla), nla_len(nla), attrtype); |
|
} |
|
|
|
/** |
|
* nla_parse_nested - parse nested attributes |
|
* @tb: destination array with maxtype+1 elements |
|
* @maxtype: maximum attribute type to be expected |
|
* @nla: attribute containing the nested attributes |
|
* @policy: validation policy |
|
* |
|
* See nla_parse() |
|
*/ |
|
static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, |
|
const struct nlattr *nla, |
|
const struct nla_policy *policy) |
|
{ |
|
return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy); |
|
} |
|
|
|
/** |
|
* nla_put_u8 - Add a u8 netlink attribute to a socket buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
*/ |
|
static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) |
|
{ |
|
return nla_put(skb, attrtype, sizeof(u8), &value); |
|
} |
|
|
|
/** |
|
* nla_put_u16 - Add a u16 netlink attribute to a socket buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
*/ |
|
static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) |
|
{ |
|
return nla_put(skb, attrtype, sizeof(u16), &value); |
|
} |
|
|
|
/** |
|
* nla_put_be16 - Add a __be16 netlink attribute to a socket buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
*/ |
|
static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value) |
|
{ |
|
return nla_put(skb, attrtype, sizeof(__be16), &value); |
|
} |
|
|
|
/** |
|
* nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
*/ |
|
static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value) |
|
{ |
|
return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, value); |
|
} |
|
|
|
/** |
|
* nla_put_le16 - Add a __le16 netlink attribute to a socket buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
*/ |
|
static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value) |
|
{ |
|
return nla_put(skb, attrtype, sizeof(__le16), &value); |
|
} |
|
|
|
/** |
|
* nla_put_u32 - Add a u32 netlink attribute to a socket buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
*/ |
|
static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) |
|
{ |
|
return nla_put(skb, attrtype, sizeof(u32), &value); |
|
} |
|
|
|
/** |
|
* nla_put_be32 - Add a __be32 netlink attribute to a socket buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
*/ |
|
static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value) |
|
{ |
|
return nla_put(skb, attrtype, sizeof(__be32), &value); |
|
} |
|
|
|
/** |
|
* nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
*/ |
|
static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value) |
|
{ |
|
return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, value); |
|
} |
|
|
|
/** |
|
* nla_put_le32 - Add a __le32 netlink attribute to a socket buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
*/ |
|
static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value) |
|
{ |
|
return nla_put(skb, attrtype, sizeof(__le32), &value); |
|
} |
|
|
|
/** |
|
* nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
* @padattr: attribute type for the padding |
|
*/ |
|
static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype, |
|
u64 value, int padattr) |
|
{ |
|
return nla_put_64bit(skb, attrtype, sizeof(u64), &value, padattr); |
|
} |
|
|
|
/** |
|
* nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
* @padattr: attribute type for the padding |
|
*/ |
|
static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value, |
|
int padattr) |
|
{ |
|
return nla_put_64bit(skb, attrtype, sizeof(__be64), &value, padattr); |
|
} |
|
|
|
/** |
|
* nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
* @padattr: attribute type for the padding |
|
*/ |
|
static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value, |
|
int padattr) |
|
{ |
|
return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, value, |
|
padattr); |
|
} |
|
|
|
/** |
|
* nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
* @padattr: attribute type for the padding |
|
*/ |
|
static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value, |
|
int padattr) |
|
{ |
|
return nla_put_64bit(skb, attrtype, sizeof(__le64), &value, padattr); |
|
} |
|
|
|
/** |
|
* nla_put_s8 - Add a s8 netlink attribute to a socket buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
*/ |
|
static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value) |
|
{ |
|
return nla_put(skb, attrtype, sizeof(s8), &value); |
|
} |
|
|
|
/** |
|
* nla_put_s16 - Add a s16 netlink attribute to a socket buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
*/ |
|
static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value) |
|
{ |
|
return nla_put(skb, attrtype, sizeof(s16), &value); |
|
} |
|
|
|
/** |
|
* nla_put_s32 - Add a s32 netlink attribute to a socket buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
*/ |
|
static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value) |
|
{ |
|
return nla_put(skb, attrtype, sizeof(s32), &value); |
|
} |
|
|
|
/** |
|
* nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @value: numeric value |
|
* @padattr: attribute type for the padding |
|
*/ |
|
static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value, |
|
int padattr) |
|
{ |
|
return nla_put_64bit(skb, attrtype, sizeof(s64), &value, padattr); |
|
} |
|
|
|
/** |
|
* nla_put_string - Add a string netlink attribute to a socket buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @str: NUL terminated string |
|
*/ |
|
static inline int nla_put_string(struct sk_buff *skb, int attrtype, |
|
const char *str) |
|
{ |
|
return nla_put(skb, attrtype, strlen(str) + 1, str); |
|
} |
|
|
|
/** |
|
* nla_put_flag - Add a flag netlink attribute to a socket buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
*/ |
|
static inline int nla_put_flag(struct sk_buff *skb, int attrtype) |
|
{ |
|
return nla_put(skb, attrtype, 0, NULL); |
|
} |
|
|
|
/** |
|
* nla_put_msecs - Add a msecs netlink attribute to a skb and align it |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @njiffies: number of jiffies to convert to msecs |
|
* @padattr: attribute type for the padding |
|
*/ |
|
static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, |
|
unsigned long njiffies, int padattr) |
|
{ |
|
u64 tmp = jiffies_to_msecs(njiffies); |
|
|
|
return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); |
|
} |
|
|
|
/** |
|
* nla_put_in_addr - Add an IPv4 address netlink attribute to a socket |
|
* buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @addr: IPv4 address |
|
*/ |
|
static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype, |
|
__be32 addr) |
|
{ |
|
return nla_put_be32(skb, attrtype, addr); |
|
} |
|
|
|
/** |
|
* nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket |
|
* buffer |
|
* @skb: socket buffer to add attribute to |
|
* @attrtype: attribute type |
|
* @addr: IPv6 address |
|
*/ |
|
static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype, |
|
const struct in6_addr *addr) |
|
{ |
|
return nla_put(skb, attrtype, sizeof(*addr), addr); |
|
} |
|
|
|
/** |
|
* nla_get_u32 - return payload of u32 attribute |
|
* @nla: u32 netlink attribute |
|
*/ |
|
static inline u32 nla_get_u32(const struct nlattr *nla) |
|
{ |
|
return *(u32 *) nla_data(nla); |
|
} |
|
|
|
/** |
|
* nla_get_be32 - return payload of __be32 attribute |
|
* @nla: __be32 netlink attribute |
|
*/ |
|
static inline __be32 nla_get_be32(const struct nlattr *nla) |
|
{ |
|
return *(__be32 *) nla_data(nla); |
|
} |
|
|
|
/** |
|
* nla_get_le32 - return payload of __le32 attribute |
|
* @nla: __le32 netlink attribute |
|
*/ |
|
static inline __le32 nla_get_le32(const struct nlattr *nla) |
|
{ |
|
return *(__le32 *) nla_data(nla); |
|
} |
|
|
|
/** |
|
* nla_get_u16 - return payload of u16 attribute |
|
* @nla: u16 netlink attribute |
|
*/ |
|
static inline u16 nla_get_u16(const struct nlattr *nla) |
|
{ |
|
return *(u16 *) nla_data(nla); |
|
} |
|
|
|
/** |
|
* nla_get_be16 - return payload of __be16 attribute |
|
* @nla: __be16 netlink attribute |
|
*/ |
|
static inline __be16 nla_get_be16(const struct nlattr *nla) |
|
{ |
|
return *(__be16 *) nla_data(nla); |
|
} |
|
|
|
/** |
|
* nla_get_le16 - return payload of __le16 attribute |
|
* @nla: __le16 netlink attribute |
|
*/ |
|
static inline __le16 nla_get_le16(const struct nlattr *nla) |
|
{ |
|
return *(__le16 *) nla_data(nla); |
|
} |
|
|
|
/** |
|
* nla_get_u8 - return payload of u8 attribute |
|
* @nla: u8 netlink attribute |
|
*/ |
|
static inline u8 nla_get_u8(const struct nlattr *nla) |
|
{ |
|
return *(u8 *) nla_data(nla); |
|
} |
|
|
|
/** |
|
* nla_get_u64 - return payload of u64 attribute |
|
* @nla: u64 netlink attribute |
|
*/ |
|
static inline u64 nla_get_u64(const struct nlattr *nla) |
|
{ |
|
u64 tmp; |
|
|
|
nla_memcpy(&tmp, nla, sizeof(tmp)); |
|
|
|
return tmp; |
|
} |
|
|
|
/** |
|
* nla_get_be64 - return payload of __be64 attribute |
|
* @nla: __be64 netlink attribute |
|
*/ |
|
static inline __be64 nla_get_be64(const struct nlattr *nla) |
|
{ |
|
__be64 tmp; |
|
|
|
nla_memcpy(&tmp, nla, sizeof(tmp)); |
|
|
|
return tmp; |
|
} |
|
|
|
/** |
|
* nla_get_le64 - return payload of __le64 attribute |
|
* @nla: __le64 netlink attribute |
|
*/ |
|
static inline __le64 nla_get_le64(const struct nlattr *nla) |
|
{ |
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return *(__le64 *) nla_data(nla); |
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} |
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/** |
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* nla_get_s32 - return payload of s32 attribute |
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* @nla: s32 netlink attribute |
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*/ |
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static inline s32 nla_get_s32(const struct nlattr *nla) |
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{ |
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return *(s32 *) nla_data(nla); |
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} |
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|
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/** |
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* nla_get_s16 - return payload of s16 attribute |
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* @nla: s16 netlink attribute |
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*/ |
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static inline s16 nla_get_s16(const struct nlattr *nla) |
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{ |
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return *(s16 *) nla_data(nla); |
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} |
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|
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/** |
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* nla_get_s8 - return payload of s8 attribute |
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* @nla: s8 netlink attribute |
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*/ |
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static inline s8 nla_get_s8(const struct nlattr *nla) |
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{ |
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return *(s8 *) nla_data(nla); |
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} |
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/** |
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* nla_get_s64 - return payload of s64 attribute |
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* @nla: s64 netlink attribute |
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*/ |
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static inline s64 nla_get_s64(const struct nlattr *nla) |
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{ |
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s64 tmp; |
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nla_memcpy(&tmp, nla, sizeof(tmp)); |
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return tmp; |
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} |
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/** |
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* nla_get_flag - return payload of flag attribute |
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* @nla: flag netlink attribute |
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*/ |
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static inline int nla_get_flag(const struct nlattr *nla) |
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{ |
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return !!nla; |
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} |
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/** |
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* nla_get_msecs - return payload of msecs attribute |
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* @nla: msecs netlink attribute |
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* |
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* Returns the number of milliseconds in jiffies. |
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*/ |
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static inline unsigned long nla_get_msecs(const struct nlattr *nla) |
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{ |
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u64 msecs = nla_get_u64(nla); |
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return msecs_to_jiffies((unsigned long) msecs); |
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} |
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/** |
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* nla_get_in_addr - return payload of IPv4 address attribute |
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* @nla: IPv4 address netlink attribute |
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*/ |
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static inline __be32 nla_get_in_addr(const struct nlattr *nla) |
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{ |
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return *(__be32 *) nla_data(nla); |
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} |
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/** |
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* nla_get_in6_addr - return payload of IPv6 address attribute |
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* @nla: IPv6 address netlink attribute |
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*/ |
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static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla) |
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{ |
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struct in6_addr tmp; |
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nla_memcpy(&tmp, nla, sizeof(tmp)); |
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return tmp; |
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} |
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|
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/** |
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* nla_nest_start - Start a new level of nested attributes |
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* @skb: socket buffer to add attributes to |
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* @attrtype: attribute type of container |
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* |
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* Returns the container attribute |
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*/ |
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static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) |
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{ |
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struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); |
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if (nla_put(skb, attrtype, 0, NULL) < 0) |
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return NULL; |
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return start; |
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} |
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/** |
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* nla_nest_end - Finalize nesting of attributes |
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* @skb: socket buffer the attributes are stored in |
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* @start: container attribute |
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* |
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* Corrects the container attribute header to include the all |
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* appeneded attributes. |
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* |
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* Returns the total data length of the skb. |
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*/ |
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static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) |
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{ |
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start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; |
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return skb->len; |
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} |
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/** |
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* nla_nest_cancel - Cancel nesting of attributes |
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* @skb: socket buffer the message is stored in |
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* @start: container attribute |
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* |
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* Removes the container attribute and including all nested |
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* attributes. Returns -EMSGSIZE |
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*/ |
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static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) |
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{ |
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nlmsg_trim(skb, start); |
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} |
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|
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/** |
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* nla_validate_nested - Validate a stream of nested attributes |
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* @start: container attribute |
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* @maxtype: maximum attribute type to be expected |
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* @policy: validation policy |
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* |
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* Validates all attributes in the nested attribute stream against the |
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* specified policy. Attributes with a type exceeding maxtype will be |
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* ignored. See documenation of struct nla_policy for more details. |
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* |
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* Returns 0 on success or a negative error code. |
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*/ |
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static inline int nla_validate_nested(const struct nlattr *start, int maxtype, |
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const struct nla_policy *policy) |
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{ |
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return nla_validate(nla_data(start), nla_len(start), maxtype, policy); |
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} |
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/** |
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* nla_need_padding_for_64bit - test 64-bit alignment of the next attribute |
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* @skb: socket buffer the message is stored in |
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* |
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* Return true if padding is needed to align the next attribute (nla_data()) to |
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* a 64-bit aligned area. |
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*/ |
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static inline bool nla_need_padding_for_64bit(struct sk_buff *skb) |
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{ |
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#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
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/* The nlattr header is 4 bytes in size, that's why we test |
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* if the skb->data _is_ aligned. A NOP attribute, plus |
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* nlattr header for next attribute, will make nla_data() |
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* 8-byte aligned. |
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*/ |
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if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8)) |
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return true; |
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#endif |
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return false; |
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} |
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|
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/** |
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* nla_align_64bit - 64-bit align the nla_data() of next attribute |
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* @skb: socket buffer the message is stored in |
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* @padattr: attribute type for the padding |
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* |
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* Conditionally emit a padding netlink attribute in order to make |
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* the next attribute we emit have a 64-bit aligned nla_data() area. |
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* This will only be done in architectures which do not have |
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* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined. |
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* |
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* Returns zero on success or a negative error code. |
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*/ |
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static inline int nla_align_64bit(struct sk_buff *skb, int padattr) |
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{ |
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if (nla_need_padding_for_64bit(skb) && |
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!nla_reserve(skb, padattr, 0)) |
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return -EMSGSIZE; |
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|
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return 0; |
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} |
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|
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/** |
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* nla_total_size_64bit - total length of attribute including padding |
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* @payload: length of payload |
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*/ |
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static inline int nla_total_size_64bit(int payload) |
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{ |
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return NLA_ALIGN(nla_attr_size(payload)) |
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#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
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+ NLA_ALIGN(nla_attr_size(0)) |
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#endif |
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; |
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} |
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|
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/** |
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* nla_for_each_attr - iterate over a stream of attributes |
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* @pos: loop counter, set to current attribute |
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* @head: head of attribute stream |
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* @len: length of attribute stream |
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* @rem: initialized to len, holds bytes currently remaining in stream |
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*/ |
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#define nla_for_each_attr(pos, head, len, rem) \ |
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for (pos = head, rem = len; \ |
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nla_ok(pos, rem); \ |
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pos = nla_next(pos, &(rem))) |
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|
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/** |
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* nla_for_each_nested - iterate over nested attributes |
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* @pos: loop counter, set to current attribute |
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* @nla: attribute containing the nested attributes |
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* @rem: initialized to len, holds bytes currently remaining in stream |
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*/ |
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#define nla_for_each_nested(pos, nla, rem) \ |
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nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) |
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|
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/** |
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* nla_is_last - Test if attribute is last in stream |
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* @nla: attribute to test |
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* @rem: bytes remaining in stream |
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*/ |
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static inline bool nla_is_last(const struct nlattr *nla, int rem) |
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{ |
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return nla->nla_len == rem; |
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} |
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|
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#endif
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