| #ifndef __NET_NETLINK_H |
| #define __NET_NETLINK_H |
| |
| #include <linux/types.h> |
| #include <linux/netlink.h> |
| #include <linux/jiffies.h> |
| |
| /* ======================================================================== |
| * Netlink Messages and Attributes Interface (As Seen On TV) |
| * ------------------------------------------------------------------------ |
| * Messages Interface |
| * ------------------------------------------------------------------------ |
| * |
| * Message Format: |
| * <--- nlmsg_total_size(payload) ---> |
| * <-- nlmsg_msg_size(payload) -> |
| * +----------+- - -+-------------+- - -+-------- - - |
| * | nlmsghdr | Pad | Payload | Pad | nlmsghdr |
| * +----------+- - -+-------------+- - -+-------- - - |
| * nlmsg_data(nlh)---^ ^ |
| * nlmsg_next(nlh)-----------------------+ |
| * |
| * Payload Format: |
| * <---------------------- nlmsg_len(nlh) ---------------------> |
| * <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) -> |
| * +----------------------+- - -+--------------------------------+ |
| * | Family Header | Pad | Attributes | |
| * +----------------------+- - -+--------------------------------+ |
| * nlmsg_attrdata(nlh, hdrlen)---^ |
| * |
| * Data Structures: |
| * struct nlmsghdr netlink message header |
| * |
| * Message Construction: |
| * nlmsg_new() create a new netlink message |
| * nlmsg_put() add a netlink message to an skb |
| * nlmsg_put_answer() callback based nlmsg_put() |
| * nlmsg_end() finanlize netlink message |
| * 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 |
| * |
| * Message Sending: |
| * nlmsg_multicast() multicast message to several groups |
| * nlmsg_unicast() unicast a message to a single socket |
| * nlmsg_notify() send notification message |
| * |
| * Message Length Calculations: |
| * nlmsg_msg_size(payload) length of message w/o padding |
| * nlmsg_total_size(payload) length of message w/ padding |
| * nlmsg_padlen(payload) length of padding at tail |
| * |
| * Message Payload Access: |
| * nlmsg_data(nlh) head of message payload |
| * nlmsg_len(nlh) length of message payload |
| * nlmsg_attrdata(nlh, hdrlen) head of attributes data |
| * nlmsg_attrlen(nlh, hdrlen) length of attributes data |
| * |
| * Message Parsing: |
| * nlmsg_ok(nlh, remaining) does nlh fit into remaining bytes? |
| * nlmsg_next(nlh, remaining) get next netlink message |
| * nlmsg_parse() parse attributes of a message |
| * nlmsg_find_attr() find an attribute in a message |
| * nlmsg_for_each_msg() loop over all messages |
| * nlmsg_validate() validate netlink message incl. attrs |
| * nlmsg_for_each_attr() loop over all attributes |
| * |
| * Misc: |
| * nlmsg_report() report back to application? |
| * |
| * ------------------------------------------------------------------------ |
| * Attributes Interface |
| * ------------------------------------------------------------------------ |
| * |
| * Attribute Format: |
| * <------- nla_total_size(payload) -------> |
| * <---- nla_attr_size(payload) -----> |
| * +----------+- - -+- - - - - - - - - +- - -+-------- - - |
| * | Header | Pad | Payload | Pad | Header |
| * +----------+- - -+- - - - - - - - - +- - -+-------- - - |
| * <- nla_len(nla) -> ^ |
| * nla_data(nla)----^ | |
| * nla_next(nla)-----------------------------' |
| * |
| * Data Structures: |
| * struct nlattr netlink attribtue header |
| * |
| * Attribute Construction: |
| * nla_reserve(skb, type, len) reserve room for an attribute |
| * nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr |
| * nla_put(skb, type, len, data) add attribute to skb |
| * nla_put_nohdr(skb, len, data) add attribute w/o hdr |
| * |
| * Attribute Construction for Basic Types: |
| * nla_put_u8(skb, type, value) add u8 attribute to skb |
| * nla_put_u16(skb, type, value) add u16 attribute to skb |
| * nla_put_u32(skb, type, value) add u32 attribute to skb |
| * nla_put_u64(skb, type, value) add u64 attribute to skb |
| * nla_put_string(skb, type, str) add string attribute to skb |
| * nla_put_flag(skb, type) add flag attribute to skb |
| * nla_put_msecs(skb, type, jiffies) add msecs attribute to skb |
| * |
| * Exceptions Based Attribute Construction: |
| * NLA_PUT(skb, type, len, data) add attribute to skb |
| * NLA_PUT_U8(skb, type, value) add u8 attribute to skb |
| * NLA_PUT_U16(skb, type, value) add u16 attribute to skb |
| * NLA_PUT_U32(skb, type, value) add u32 attribute to skb |
| * NLA_PUT_U64(skb, type, value) add u64 attribute to skb |
| * NLA_PUT_STRING(skb, type, str) add string attribute to skb |
| * NLA_PUT_FLAG(skb, type) add flag attribute to skb |
| * NLA_PUT_MSECS(skb, type, jiffies) add msecs attribute to skb |
| * |
| * The meaning of these functions is equal to their lower case |
| * variants but they jump to the label nla_put_failure in case |
| * of a failure. |
| * |
| * Nested Attributes Construction: |
| * nla_nest_start(skb, type) start a nested attribute |
| * nla_nest_end(skb, nla) finalize a nested attribute |
| * nla_nest_cancel(skb, nla) cancel nested attribute construction |
| * |
| * Attribute Length Calculations: |
| * nla_attr_size(payload) length of attribute w/o padding |
| * nla_total_size(payload) length of attribute w/ padding |
| * nla_padlen(payload) length of padding |
| * |
| * Attribute Payload Access: |
| * nla_data(nla) head of attribute payload |
| * nla_len(nla) length of attribute payload |
| * |
| * Attribute Payload Access for Basic Types: |
| * 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 |
| * nla_get_u64(nla) get payload for a u64 attribute |
| * nla_get_flag(nla) return 1 if flag is true |
| * nla_get_msecs(nla) get payload for a msecs attribute |
| * |
| * Attribute Misc: |
| * nla_memcpy(dest, nla, count) copy attribute into memory |
| * nla_memcmp(nla, data, size) compare attribute with memory area |
| * nla_strlcpy(dst, nla, size) copy attribute to a sized string |
| * nla_strcmp(nla, str) compare attribute with string |
| * |
| * Attribute Parsing: |
| * nla_ok(nla, remaining) does nla fit into remaining bytes? |
| * nla_next(nla, remaining) get next netlink attribute |
| * nla_validate() validate a stream of attributes |
| * nla_validate_nested() validate a stream of nested attributes |
| * nla_find() find attribute in stream of attributes |
| * nla_find_nested() find attribute in nested attributes |
| * nla_parse() parse and validate stream of attrs |
| * nla_parse_nested() parse nested attribuets |
| * nla_for_each_attr() loop over all attributes |
| * nla_for_each_nested() loop over the nested attributes |
| *========================================================================= |
| */ |
| |
| /** |
| * Standard attribute types to specify validation policy |
| */ |
| enum { |
| NLA_UNSPEC, |
| NLA_U8, |
| NLA_U16, |
| NLA_U32, |
| NLA_U64, |
| NLA_STRING, |
| NLA_FLAG, |
| NLA_MSECS, |
| NLA_NESTED, |
| NLA_NUL_STRING, |
| __NLA_TYPE_MAX, |
| }; |
| |
| #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) |
| |
| /** |
| * struct nla_policy - attribute validation policy |
| * @type: Type of attribute or NLA_UNSPEC |
| * @len: Type specific length of payload |
| * |
| * Policies are defined as arrays of this struct, the array must be |
| * accessible by attribute type up to the highest identifier to be expected. |
| * |
| * Meaning of `len' field: |
| * NLA_STRING Maximum length of string |
| * NLA_NUL_STRING Maximum length of string (excluding NUL) |
| * NLA_FLAG Unused |
| * All other Exact length of attribute payload |
| * |
| * Example: |
| * static struct nla_policy my_policy[ATTR_MAX+1] __read_mostly = { |
| * [ATTR_FOO] = { .type = NLA_U16 }, |
| * [ATTR_BAR] = { .type = NLA_STRING, len = BARSIZ }, |
| * [ATTR_BAZ] = { .len = sizeof(struct mystruct) }, |
| * }; |
| */ |
| struct nla_policy { |
| u16 type; |
| u16 len; |
| }; |
| |
| /** |
| * struct nl_info - netlink source information |
| * @nlh: Netlink message header of original request |
| * @pid: Netlink PID of requesting application |
| */ |
| struct nl_info { |
| struct nlmsghdr *nlh; |
| u32 pid; |
| }; |
| |
| extern void netlink_run_queue(struct sock *sk, unsigned int *qlen, |
| int (*cb)(struct sk_buff *, |
| struct nlmsghdr *)); |
| extern void netlink_queue_skip(struct nlmsghdr *nlh, |
| struct sk_buff *skb); |
| extern int nlmsg_notify(struct sock *sk, struct sk_buff *skb, |
| u32 pid, unsigned int group, int report, |
| gfp_t flags); |
| |
| extern int nla_validate(struct nlattr *head, int len, int maxtype, |
| struct nla_policy *policy); |
| extern int nla_parse(struct nlattr *tb[], int maxtype, |
| struct nlattr *head, int len, |
| struct nla_policy *policy); |
| extern struct nlattr * nla_find(struct nlattr *head, int len, int attrtype); |
| extern size_t nla_strlcpy(char *dst, const struct nlattr *nla, |
| size_t dstsize); |
| extern int nla_memcpy(void *dest, struct nlattr *src, int count); |
| extern int nla_memcmp(const struct nlattr *nla, const void *data, |
| size_t size); |
| extern int nla_strcmp(const struct nlattr *nla, const char *str); |
| extern struct nlattr * __nla_reserve(struct sk_buff *skb, int attrtype, |
| int attrlen); |
| extern void * __nla_reserve_nohdr(struct sk_buff *skb, int attrlen); |
| extern struct nlattr * nla_reserve(struct sk_buff *skb, int attrtype, |
| int attrlen); |
| extern void * nla_reserve_nohdr(struct sk_buff *skb, int attrlen); |
| extern void __nla_put(struct sk_buff *skb, int attrtype, |
| int attrlen, const void *data); |
| extern void __nla_put_nohdr(struct sk_buff *skb, int attrlen, |
| const void *data); |
| extern int nla_put(struct sk_buff *skb, int attrtype, |
| int attrlen, const void *data); |
| extern int nla_put_nohdr(struct sk_buff *skb, int attrlen, |
| const void *data); |
| |
| /************************************************************************** |
| * Netlink Messages |
| **************************************************************************/ |
| |
| /** |
| * nlmsg_msg_size - length of netlink message not including padding |
| * @payload: length of message payload |
| */ |
| static inline int nlmsg_msg_size(int payload) |
| { |
| return NLMSG_HDRLEN + payload; |
| } |
| |
| /** |
| * nlmsg_total_size - length of netlink message including padding |
| * @payload: length of message payload |
| */ |
| static inline int nlmsg_total_size(int payload) |
| { |
| return NLMSG_ALIGN(nlmsg_msg_size(payload)); |
| } |
| |
| /** |
| * nlmsg_padlen - length of padding at the message's tail |
| * @payload: length of message payload |
| */ |
| static inline int nlmsg_padlen(int payload) |
| { |
| return nlmsg_total_size(payload) - nlmsg_msg_size(payload); |
| } |
| |
| /** |
| * nlmsg_data - head of message payload |
| * @nlh: netlink messsage header |
| */ |
| static inline void *nlmsg_data(const struct nlmsghdr *nlh) |
| { |
| return (unsigned char *) nlh + NLMSG_HDRLEN; |
| } |
| |
| /** |
| * nlmsg_len - length of message payload |
| * @nlh: netlink message header |
| */ |
| static inline int nlmsg_len(const struct nlmsghdr *nlh) |
| { |
| return nlh->nlmsg_len - NLMSG_HDRLEN; |
| } |
| |
| /** |
| * nlmsg_attrdata - head of attributes data |
| * @nlh: netlink message header |
| * @hdrlen: length of family specific header |
| */ |
| static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, |
| int hdrlen) |
| { |
| unsigned char *data = nlmsg_data(nlh); |
| return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); |
| } |
| |
| /** |
| * nlmsg_attrlen - length of attributes data |
| * @nlh: netlink message header |
| * @hdrlen: length of family specific header |
| */ |
| static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) |
| { |
| return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); |
| } |
| |
| /** |
| * nlmsg_ok - check if the netlink message fits into the remaining bytes |
| * @nlh: netlink message header |
| * @remaining: number of bytes remaining in message stream |
| */ |
| static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) |
| { |
| return (remaining >= sizeof(struct nlmsghdr) && |
| nlh->nlmsg_len >= sizeof(struct nlmsghdr) && |
| nlh->nlmsg_len <= remaining); |
| } |
| |
| /** |
| * nlmsg_next - next netlink message in message stream |
| * @nlh: netlink message header |
| * @remaining: number of bytes remaining in message stream |
| * |
| * Returns the next netlink message in the message stream and |
| * decrements remaining by the size of the current message. |
| */ |
| static inline struct nlmsghdr *nlmsg_next(struct nlmsghdr *nlh, int *remaining) |
| { |
| int totlen = NLMSG_ALIGN(nlh->nlmsg_len); |
| |
| *remaining -= totlen; |
| |
| return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); |
| } |
| |
| /** |
| * nlmsg_parse - parse attributes of a netlink message |
| * @nlh: netlink message header |
| * @hdrlen: length of family specific header |
| * @tb: destination array with maxtype+1 elements |
| * @maxtype: maximum attribute type to be expected |
| * @policy: validation policy |
| * |
| * See nla_parse() |
| */ |
| static inline int nlmsg_parse(struct nlmsghdr *nlh, int hdrlen, |
| struct nlattr *tb[], int maxtype, |
| struct nla_policy *policy) |
| { |
| if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) |
| return -EINVAL; |
| |
| return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), |
| nlmsg_attrlen(nlh, hdrlen), policy); |
| } |
| |
| /** |
| * nlmsg_find_attr - find a specific attribute in a netlink message |
| * @nlh: netlink message header |
| * @hdrlen: length of familiy specific header |
| * @attrtype: type of attribute to look for |
| * |
| * Returns the first attribute which matches the specified type. |
| */ |
| static inline struct nlattr *nlmsg_find_attr(struct nlmsghdr *nlh, |
| int hdrlen, int attrtype) |
| { |
| return nla_find(nlmsg_attrdata(nlh, hdrlen), |
| nlmsg_attrlen(nlh, hdrlen), attrtype); |
| } |
| |
| /** |
| * nlmsg_validate - validate a netlink message including attributes |
| * @nlh: netlinket message header |
| * @hdrlen: length of familiy specific header |
| * @maxtype: maximum attribute type to be expected |
| * @policy: validation policy |
| */ |
| static inline int nlmsg_validate(struct nlmsghdr *nlh, int hdrlen, int maxtype, |
| struct nla_policy *policy) |
| { |
| if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) |
| return -EINVAL; |
| |
| return nla_validate(nlmsg_attrdata(nlh, hdrlen), |
| nlmsg_attrlen(nlh, hdrlen), maxtype, policy); |
| } |
| |
| /** |
| * nlmsg_report - need to report back to application? |
| * @nlh: netlink message header |
| * |
| * Returns 1 if a report back to the application is requested. |
| */ |
| static inline int nlmsg_report(struct nlmsghdr *nlh) |
| { |
| return !!(nlh->nlmsg_flags & NLM_F_ECHO); |
| } |
| |
| /** |
| * 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 |
| * @rem: initialized to len, holds bytes currently remaining in stream |
| */ |
| #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ |
| nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ |
| nlmsg_attrlen(nlh, hdrlen), rem) |
| |
| #if 0 |
| /* FIXME: Enable once all users have been converted */ |
| |
| /** |
| * __nlmsg_put - Add a new netlink message to an skb |
| * @skb: socket buffer to store message in |
| * @pid: netlink process id |
| * @seq: sequence number of message |
| * @type: message type |
| * @payload: length of message payload |
| * @flags: message flags |
| * |
| * The caller is responsible to ensure that the skb provides enough |
| * tailroom for both the netlink header and payload. |
| */ |
| static inline struct nlmsghdr *__nlmsg_put(struct sk_buff *skb, u32 pid, |
| u32 seq, int type, int payload, |
| int flags) |
| { |
| struct nlmsghdr *nlh; |
| |
| nlh = (struct nlmsghdr *) skb_put(skb, nlmsg_total_size(payload)); |
| nlh->nlmsg_type = type; |
| nlh->nlmsg_len = nlmsg_msg_size(payload); |
| nlh->nlmsg_flags = flags; |
| nlh->nlmsg_pid = pid; |
| nlh->nlmsg_seq = seq; |
| |
| memset((unsigned char *) nlmsg_data(nlh) + payload, 0, |
| nlmsg_padlen(payload)); |
| |
| return nlh; |
| } |
| #endif |
| |
| /** |
| * nlmsg_put - Add a new netlink message to an skb |
| * @skb: socket buffer to store message in |
| * @pid: netlink process id |
| * @seq: sequence number of message |
| * @type: message type |
| * @payload: length of message payload |
| * @flags: message flags |
| * |
| * Returns NULL if the tailroom of the skb is insufficient to store |
| * the message header and payload. |
| */ |
| static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, |
| int type, int payload, int flags) |
| { |
| if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) |
| return NULL; |
| |
| return __nlmsg_put(skb, pid, seq, type, payload, flags); |
| } |
| |
| /** |
| * nlmsg_put_answer - Add a new callback based netlink message to an skb |
| * @skb: socket buffer to store message in |
| * @cb: netlink callback |
| * @type: message type |
| * @payload: length of message payload |
| * @flags: message flags |
| * |
| * Returns NULL if the tailroom of the skb is insufficient to store |
| * the message header and payload. |
| */ |
| static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, |
| struct netlink_callback *cb, |
| int type, int payload, |
| int flags) |
| { |
| return nlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, |
| type, payload, flags); |
| } |
| |
| /** |
| * nlmsg_new - Allocate a new netlink message |
| * @payload: size of the message payload |
| * @flags: the type of memory to allocate. |
| * |
| * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known |
| * and a good default is needed. |
| */ |
| static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) |
| { |
| return alloc_skb(nlmsg_total_size(payload), flags); |
| } |
| |
| /** |
| * 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 |
| * attributes. Only necessary if attributes have been added to |
| * the message. |
| * |
| * Returns the total data length of the skb. |
| */ |
| static inline int nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) |
| { |
| nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; |
| |
| return skb->len; |
| } |
| |
| /** |
| * 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. Returns -1. |
| */ |
| static inline int nlmsg_trim(struct sk_buff *skb, const void *mark) |
| { |
| if (mark) |
| skb_trim(skb, (unsigned char *) mark - skb->data); |
| |
| return -1; |
| } |
| |
| /** |
| * 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. Returns -1. |
| */ |
| static inline int nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) |
| { |
| return 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 |
| * @pid: own netlink pid 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 pid, unsigned int group, gfp_t flags) |
| { |
| int err; |
| |
| NETLINK_CB(skb).dst_group = group; |
| |
| err = netlink_broadcast(sk, skb, pid, 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 |
| * @pid: netlink pid of the destination socket |
| */ |
| static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 pid) |
| { |
| int err; |
| |
| err = netlink_unicast(sk, skb, pid, 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))) |
| |
| /************************************************************************** |
| * 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_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 >= sizeof(*nla) && |
| nla->nla_len >= sizeof(*nla) && |
| nla->nla_len <= remaining; |
| } |
| |
| /** |
| * nla_next - next netlink attribte 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(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, |
| struct nlattr *nla, |
| struct nla_policy *policy) |
| { |
| return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy); |
| } |
| /** |
| * nla_put_u8 - 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_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_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_64 - Add a u64 netlink attribute to a socket buffer |
| * @skb: socket buffer to add attribute to |
| * @attrtype: attribute type |
| * @value: numeric value |
| */ |
| static inline int nla_put_u64(struct sk_buff *skb, int attrtype, u64 value) |
| { |
| return nla_put(skb, attrtype, sizeof(u64), &value); |
| } |
| |
| /** |
| * 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 socket buffer |
| * @skb: socket buffer to add attribute to |
| * @attrtype: attribute type |
| * @jiffies: number of msecs in jiffies |
| */ |
| static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, |
| unsigned long jiffies) |
| { |
| u64 tmp = jiffies_to_msecs(jiffies); |
| return nla_put(skb, attrtype, sizeof(u64), &tmp); |
| } |
| |
| #define NLA_PUT(skb, attrtype, attrlen, data) \ |
| do { \ |
| if (nla_put(skb, attrtype, attrlen, data) < 0) \ |
| goto nla_put_failure; \ |
| } while(0) |
| |
| #define NLA_PUT_TYPE(skb, type, attrtype, value) \ |
| do { \ |
| type __tmp = value; \ |
| NLA_PUT(skb, attrtype, sizeof(type), &__tmp); \ |
| } while(0) |
| |
| #define NLA_PUT_U8(skb, attrtype, value) \ |
| NLA_PUT_TYPE(skb, u8, attrtype, value) |
| |
| #define NLA_PUT_U16(skb, attrtype, value) \ |
| NLA_PUT_TYPE(skb, u16, attrtype, value) |
| |
| #define NLA_PUT_LE16(skb, attrtype, value) \ |
| NLA_PUT_TYPE(skb, __le16, attrtype, value) |
| |
| #define NLA_PUT_U32(skb, attrtype, value) \ |
| NLA_PUT_TYPE(skb, u32, attrtype, value) |
| |
| #define NLA_PUT_BE32(skb, attrtype, value) \ |
| NLA_PUT_TYPE(skb, __be32, attrtype, value) |
| |
| #define NLA_PUT_U64(skb, attrtype, value) \ |
| NLA_PUT_TYPE(skb, u64, attrtype, value) |
| |
| #define NLA_PUT_STRING(skb, attrtype, value) \ |
| NLA_PUT(skb, attrtype, strlen(value) + 1, value) |
| |
| #define NLA_PUT_FLAG(skb, attrtype) \ |
| NLA_PUT(skb, attrtype, 0, NULL) |
| |
| #define NLA_PUT_MSECS(skb, attrtype, jiffies) \ |
| NLA_PUT_U64(skb, attrtype, jiffies_to_msecs(jiffies)) |
| |
| /** |
| * nla_get_u32 - return payload of u32 attribute |
| * @nla: u32 netlink attribute |
| */ |
| static inline u32 nla_get_u32(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(struct nlattr *nla) |
| { |
| return *(__be32 *) nla_data(nla); |
| } |
| |
| /** |
| * nla_get_u16 - return payload of u16 attribute |
| * @nla: u16 netlink attribute |
| */ |
| static inline u16 nla_get_u16(struct nlattr *nla) |
| { |
| return *(u16 *) nla_data(nla); |
| } |
| |
| /** |
| * nla_get_le16 - return payload of __le16 attribute |
| * @nla: __le16 netlink attribute |
| */ |
| static inline __le16 nla_get_le16(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(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(struct nlattr *nla) |
| { |
| u64 tmp; |
| |
| nla_memcpy(&tmp, nla, sizeof(tmp)); |
| |
| return tmp; |
| } |
| |
| /** |
| * nla_get_flag - return payload of flag attribute |
| * @nla: flag netlink attribute |
| */ |
| static inline int nla_get_flag(struct nlattr *nla) |
| { |
| return !!nla; |
| } |
| |
| /** |
| * nla_get_msecs - return payload of msecs attribute |
| * @nla: msecs netlink attribute |
| * |
| * Returns the number of milliseconds in jiffies. |
| */ |
| static inline unsigned long nla_get_msecs(struct nlattr *nla) |
| { |
| u64 msecs = nla_get_u64(nla); |
| |
| return msecs_to_jiffies((unsigned long) msecs); |
| } |
| |
| /** |
| * nla_nest_start - Start a new level of nested attributes |
| * @skb: socket buffer to add attributes to |
| * @attrtype: attribute type of container |
| * |
| * Returns the container attribute |
| */ |
| static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) |
| { |
| struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); |
| |
| if (nla_put(skb, attrtype, 0, NULL) < 0) |
| return NULL; |
| |
| return start; |
| } |
| |
| /** |
| * nla_nest_end - Finalize nesting of attributes |
| * @skb: socket buffer the attribtues are stored in |
| * @start: container attribute |
| * |
| * Corrects the container attribute header to include the all |
| * appeneded attributes. |
| * |
| * Returns the total data length of the skb. |
| */ |
| static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) |
| { |
| start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; |
| return skb->len; |
| } |
| |
| /** |
| * nla_nest_cancel - Cancel nesting of attributes |
| * @skb: socket buffer the message is stored in |
| * @start: container attribute |
| * |
| * Removes the container attribute and including all nested |
| * attributes. Returns -1. |
| */ |
| static inline int nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) |
| { |
| return nlmsg_trim(skb, start); |
| } |
| |
| /** |
| * nla_validate_nested - Validate a stream of nested attributes |
| * @start: container attribute |
| * @maxtype: maximum attribute type to be expected |
| * @policy: validation policy |
| * |
| * 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. |
| * |
| * Returns 0 on success or a negative error code. |
| */ |
| static inline int nla_validate_nested(struct nlattr *start, int maxtype, |
| struct nla_policy *policy) |
| { |
| return nla_validate(nla_data(start), nla_len(start), maxtype, policy); |
| } |
| |
| /** |
| * nla_for_each_attr - iterate over a stream of attributes |
| * @pos: loop counter, set to current attribute |
| * @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(pos, head, len, rem) \ |
| for (pos = head, rem = len; \ |
| nla_ok(pos, rem); \ |
| pos = nla_next(pos, &(rem))) |
| |
| /** |
| * nla_for_each_nested - iterate over nested attributes |
| * @pos: loop counter, set to current attribute |
| * @nla: attribute containing the nested attributes |
| * @rem: initialized to len, holds bytes currently remaining in stream |
| */ |
| #define nla_for_each_nested(pos, nla, rem) \ |
| nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) |
| |
| #endif |