/*
- * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2004-2007 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
/*!
@enum mbuf_flags_t
@abstract Constants defining mbuf flags. Only the flags listed below
- can be set or retreieved.
+ can be set or retrieved.
@constant MBUF_EXT Indicates this mbuf has external data.
@constant MBUF_PKTHDR Indicates this mbuf has a packet header.
@constant MBUF_EOR Indicates this mbuf is the end of a record.
/* Parameter for m_copym to copy all bytes */
#define MBUF_COPYALL 1000000000
+__BEGIN_DECLS
/* Data access */
/*!
@function mbuf_data
@discussion Returns a pointer to the start of data in this mbuf.
There may be additional data on chained mbufs. The data you're
- looking for may not be contiguous if it spans more than one
- mbuf. Use mbuf_len to determine the lenght of data available in
- this mbuf. If a data structure you want to access stradles two
- mbufs in a chain, either use mbuf_pullup to get the data
- contiguous in one mbuf or copy the pieces of data from each mbuf
- in to a contiguous buffer. Using mbuf_pullup has the advantage
- of not having to copy the data. On the other hand, if you don't
- make sure there is space in the mbuf, mbuf_pullup may fail and
- free the mbuf.
+ looking for may not be virtually contiguous if it spans more
+ than one mbuf. In addition, data that is virtually contiguous
+ might not be represented by physically contiguous pages; see
+ further comments in mbuf_data_to_physical. Use mbuf_len to
+ determine the lenght of data available in this mbuf. If a data
+ structure you want to access stradles two mbufs in a chain,
+ either use mbuf_pullup to get the data contiguous in one mbuf
+ or copy the pieces of data from each mbuf in to a contiguous
+ buffer. Using mbuf_pullup has the advantage of not having to
+ copy the data. On the other hand, if you don't make sure there
+ is space in the mbuf, mbuf_pullup may fail and free the mbuf.
@param mbuf The mbuf.
@result A pointer to the data in the mbuf.
*/
@discussion mbuf_data_to_physical is a replacement for mcl_to_paddr.
Given a pointer returned from mbuf_data of mbuf_datastart,
mbuf_data_to_physical will return the phyical address for that
- block of data.
+ block of data. Note that even though the data is in virtually
+ contiguous span, the underlying physical pages might not be
+ physically contiguous. Because of this, callers must ensure
+ to call this routine for each page boundary. Device drivers
+ that deal with DMA are strongly encouraged to utilize the
+ IOMbufNaturalMemoryCursor and walk down the list of vectors
+ instead of using this interface to obtain the physical address.
+ Use of this routine is therefore discouraged.
@param ptr A pointer to data stored in an mbuf.
@result The 64 bit physical address of the mbuf data or NULL if ptr
does not point to data stored in an mbuf.
*/
errno_t mbuf_gethdr(mbuf_how_t how, mbuf_type_t type, mbuf_t* mbuf);
+/*!
+ @function mbuf_attachcluster
+ @discussion Attach an external buffer as a cluster for an mbuf. If mbuf
+ points to a NULL mbuf_t, an mbuf will be allocated for you. If
+ mbuf points to a non-NULL mbuf_t, the user-supplied mbuf will
+ be used instead. The caller is responsible for allocating the
+ external buffer by calling mbuf_alloccluster().
+ @param how Blocking or non-blocking.
+ @param type The type of the mbuf if mbuf is non-NULL; otherwise ignored.
+ @param mbuf Pointer to the address of the mbuf; if NULL, an mbuf will
+ be allocated, otherwise, it must point to a valid mbuf address.
+ If the user-supplied mbuf is already attached to a cluster, the
+ current cluster will be freed before the mbuf gets attached to
+ the supplied external buffer. Note that this routine may return
+ a different mbuf_t than the one you passed in.
+ @param extbuf Address of the external buffer.
+ @param extfree Free routine for the external buffer; the caller is
+ required to defined a routine that will be invoked when the
+ mbuf is freed.
+ @param extsize Size of the external buffer.
+ @param extarg Private value that will be passed to the free routine
+ when it is called at the time the mbuf is freed.
+ @result 0 on success
+ EINVAL - Invalid parameter
+ ENOMEM - Not enough memory available
+ */
+errno_t
+mbuf_attachcluster(mbuf_how_t how, mbuf_type_t type, mbuf_t *mbuf,
+ caddr_t extbuf, void (*extfree)(caddr_t , u_int, caddr_t),
+ size_t extsize, caddr_t extarg);
+
+/*!
+ @function mbuf_alloccluster
+ @discussion Allocate a cluster that can be later attached to an
+ mbuf by calling mbuf_attachcluster(). The allocated cluster
+ can also be freed (without being attached to an mbuf) by
+ calling mbuf_freecluster(). At the moment this routine
+ will either return a cluster of 2048, 4096 or 16384 bytes
+ depending on the requested size. Note that clusters greater
+ than 4096 bytes might not be available in all configurations;
+ the caller must additionally check for ENOTSUP (see below).
+ @param how Blocking or non-blocking.
+ @param size Pointer to size of requested cluster. Sizes up to 2048
+ will be rounded up to 2048; sizes greater than 2048 and up
+ to 4096 will be rounded up to 4096. Sizes greater than 4096
+ will be rounded up to 16384.
+ @param addr Pointer to the address of the requested cluster.
+ @result 0 on success or ENOMEM if failure. If the caller requests
+ greater than 4096 bytes and the system is unable to fulfill
+ the request due to the lack of jumbo clusters support based
+ on the configuration, this routine will return ENOTSUP.
+ In this case, the caller is advised to use 4096 bytes or
+ smaller during subseqent requests.
+ */
+errno_t mbuf_alloccluster(mbuf_how_t how, size_t *size, caddr_t *addr);
+
+/*!
+ @function mbuf_freecluster
+ @discussion Free a cluster that was previously allocated by a call
+ to mbuf_alloccluster(). The caller must pass the actual
+ size of the cluster as returned by mbuf_alloccluster(),
+ which at this point must be either 2048, 4096 or 16384 bytes.
+ @param addr The address of the cluster.
+ @param size The actual size of the cluster.
+ */
+void mbuf_freecluster(caddr_t addr, size_t size);
/*!
@function mbuf_getcluster
@discussion Allocate a cluster of the requested size and attach it to
- an mbuf for use as external data. If mbuf points to a NULL mbuf_t,
- an mbuf will be allocated for you. If mbuf points to a non-NULL mbuf_t,
- mbuf_getcluster may return a different mbuf_t than the one you
- passed in.
+ an mbuf for use as external data. If mbuf points to a NULL
+ mbuf_t, an mbuf will be allocated for you. If mbuf points to
+ a non-NULL mbuf_t, mbuf_getcluster may return a different
+ mbuf_t than the one you passed in.
@param how Blocking or non-blocking.
@param type The type of the mbuf.
- @param size The size of the cluster to be allocated. Supported sizes for a
- cluster are be 2048 or 4096. Any other value with return EINVAL.
+ @param size The size of the cluster to be allocated. Supported sizes
+ for a cluster are be 2048, 4096, or 16384. Any other value
+ with return EINVAL. Note that clusters greater than 4096
+ bytes might not be available in all configurations; the
+ caller must additionally check for ENOTSUP (see below).
@param mbuf The mbuf the cluster will be attached to.
@result 0 on success, errno error on failure. If you specified NULL
for the mbuf, any intermediate mbuf that may have been allocated
mbuf_mclget will not free it.
EINVAL - Invalid parameter
ENOMEM - Not enough memory available
+ ENOTSUP - The caller had requested greater than 4096 bytes
+ cluster and the system is unable to fulfill it due to the
+ lack of jumbo clusters support based on the configuration.
+ In this case, the caller is advised to use 4096 bytes or
+ smaller during subsequent requests.
*/
errno_t mbuf_getcluster(mbuf_how_t how, mbuf_type_t type, size_t size, mbuf_t* mbuf);
/*!
@function mbuf_allocpacket
- @discussion Allocate an mbuf chain to store a single packet of the requested length.
- According to the requested length, a chain of mbufs will be created. The mbuf type
- will be set to MBUF_TYPE_DATA. The caller may specify the maximum number of
- buffer
+ @discussion Allocate an mbuf chain to store a single packet of the
+ requested length. According to the requested length, a chain
+ of mbufs will be created. The mbuf type will be set to
+ MBUF_TYPE_DATA. The caller may specify the maximum number of
+ buffer.
@param how Blocking or non-blocking
@param packetlen The total length of the packet mbuf to be allocated.
The length must be greater than zero.
- @param maxchunks An input/output pointer to the maximum number of mbufs segments making up the chain.
- On input if maxchunks is zero, or the value pointed to by maxchunks is zero,
- the packet will be made of as many buffer segments as necessary to fit the length.
- The allocation will fail with ENOBUFS if the number of segments requested is too small and
- the sum of the maximum size of each individual segment is less than the packet length.
- On output, if the allocation succeed and maxchunks is non zero, it will point to
- the actual number of segments allocated.
+ @param maxchunks An input/output pointer to the maximum number of mbufs
+ segments making up the chain. On input, if maxchunks is NULL,
+ or the value pointed to by maxchunks is zero, the packet will
+ be made up of as few or as many buffer segments as necessary
+ to fit the length. The allocation will fail with ENOBUFS if
+ the number of segments requested is too small and the sum of
+ the maximum size of each individual segment is less than the
+ packet length. On output, if the allocation succeed and
+ maxchunks is non-NULL, it will point to the actual number
+ of segments allocated.
+ Additional notes for packetlen greater than 4096 bytes:
+ the caller may pass a non-NULL maxchunks and initialize it
+ with zero such that upon success, it can find out whether
+ or not the system configuration allows for larger than
+ 4096 bytes cluster allocations, by checking on the value
+ pointed to by maxchunks. E.g. a request for 9018 bytes may
+ result in 1 chunk when jumbo clusters are available, or
+ 3 chunks otherwise.
@param Upon success, *mbuf will be a reference to the new mbuf.
@result Returns 0 upon success or the following error code:
EINVAL - Invalid parameter
ENOMEM - Not enough memory available
- ENOBUFS - Buffers not big enough for the maximum number of chunks requested
+ ENOBUFS - Buffers not big enough for the maximum number of
+ chunks requested
*/
errno_t mbuf_allocpacket(mbuf_how_t how, size_t packetlen, unsigned int * maxchunks, mbuf_t *mbuf);
+/*!
+ @function mbuf_allocpacket_list
+ @discussion Allocate a linked list of packets. According to the
+ requested length, each packet will made of a chain of one
+ or more mbufs. The mbuf type will be set to MBUF_TYPE_DATA.
+ The caller may specify the maximum number of element for
+ each mbuf chain making up a packet.
+ @param numpkts Number of packets to allocate
+ @param how Blocking or non-blocking
+ @param packetlen The total length of the packet mbuf to be allocated.
+ The length must be greater than zero.
+ @param maxchunks An input/output pointer to the maximum number of
+ mbufs segments making up the chain. On input, if maxchunks is
+ zero, or the value pointed to by maxchunks is zero, the packet
+ will be made of as few or as many buffer segments as necessary
+ to fit the length. The allocation will fail with ENOBUFS if
+ the number of segments requested is too small and the sum of
+ the maximum size of each individual segment is less than the
+ packet length. On output, if the allocation succeed and
+ maxchunks is non zero, it will point to the actual number
+ of segments allocated.
+ Additional notes for packetlen greater than 4096 bytes:
+ the caller may pass a non-NULL maxchunks and initialize it
+ with zero such that upon success, it can find out whether
+ or not the system configuration allows for larger than
+ 4096 bytes cluster allocations, by checking on the value
+ pointed to by maxchunks. E.g. a request for 9018 bytes may
+ result in 1 chunk when jumbo clusters are available, or
+ 3 chunks otherwise.
+ @param Upon success, *mbuf will be a reference to the new mbuf.
+ @result Returns 0 upon success or the following error code:
+ EINVAL - Invalid parameter
+ ENOMEM - Not enough memory available
+ ENOBUFS - Buffers not big enough for the maximum number of
+ chunks requested
+*/
+errno_t mbuf_allocpacket_list(unsigned int numpkts, mbuf_how_t how, size_t packetlen, unsigned int * maxchunks, mbuf_t *mbuf);
+
+
/*!
@function mbuf_getpacket
@discussion Allocate an mbuf, allocate and attach a cluster, and set
/*!
@function mbuf_freem_list
@discussion Frees linked list of mbuf chains. Walks through
- mnextpackt and does the equivalent of mbuf_mfreem to each.
+ mnextpackt and does the equivalent of mbuf_freem to each.
@param mbuf The first mbuf in the linked list to free.
@result The number of mbufs freed.
*/
@param mbuf The mbuf.
@result The number of unused bytes at the start of the mbuf.
*/
-size_t mbuf_leadingspace(mbuf_t mbuf);
+size_t mbuf_leadingspace(const mbuf_t mbuf);
/*!
@function mbuf_trailingspace
@param mbuf The mbuf.
@result The number of unused bytes following the current data.
*/
-size_t mbuf_trailingspace(mbuf_t mbuf);
+size_t mbuf_trailingspace(const mbuf_t mbuf);
/* Manipulation */
/*!
@function mbuf_copym
- @discussion Copies len bytes from offset from src to a new mbuf.
+ @discussion Copies len bytes from offset from src to a new mbuf. If
+ the original mbuf contains a packet header, the new mbuf will
+ contain similar packet header except for any tags which may be
+ associated with the original mbuf. mbuf_dup() should be used
+ instead if tags are to be copied to the new mbuf.
@param src The source mbuf.
@param offset The offset in the mbuf to start copying from.
@param len The the number of bytes to copy.
@param new_mbuf Upon success, the newly allocated mbuf.
@result 0 upon success otherwise the errno error.
*/
-errno_t mbuf_copym(mbuf_t src, size_t offset, size_t len,
+errno_t mbuf_copym(const mbuf_t src, size_t offset, size_t len,
mbuf_how_t how, mbuf_t* new_mbuf);
/*!
@function mbuf_dup
- @discussion Exactly duplicates an mbuf chain.
+ @discussion Exactly duplicates an mbuf chain. If the original mbuf
+ contains a packet header (including tags), the new mbuf will have
+ the same packet header contents and a copy of each tag associated
+ with the original mbuf.
@param src The source mbuf.
@param how Blocking or non-blocking.
@param new_mbuf Upon success, the newly allocated mbuf.
@result 0 upon success otherwise the errno error.
*/
-errno_t mbuf_dup(mbuf_t src, mbuf_how_t how, mbuf_t* new_mbuf);
+errno_t mbuf_dup(const mbuf_t src, mbuf_how_t how, mbuf_t* new_mbuf);
/*!
@function mbuf_prepend
of the mbuf chain.
@param mbuf The mbuf chain to trim.
@param len The number of bytes to trim from the mbuf chain.
- @result 0 upon success otherwise the errno error.
*/
void mbuf_adj(mbuf_t mbuf, int len);
+/*!
+ @function mbuf_adjustlen
+ @discussion Adds amount to the mbuf len. Verifies that the new
+ length is valid (greater than or equal to zero and less than
+ maximum amount of data that may be stored in the mbuf). This
+ function will not adjust the packet header length field or
+ affect any other mbufs in a chain.
+ @param mbuf The mbuf to adjust.
+ @param amount The number of bytes increment the length by.
+ @result 0 upon success otherwise the errno error.
+ */
+errno_t mbuf_adjustlen(mbuf_t mbuf, int amount);
+
/*!
@function mbuf_copydata
@discussion Copies data out of an mbuf in to a specified buffer. If
copied.
@result 0 upon success otherwise the errno error.
*/
-errno_t mbuf_copydata(mbuf_t mbuf, size_t offset, size_t length, void* out_data);
+errno_t mbuf_copydata(const mbuf_t mbuf, size_t offset, size_t length, void* out_data);
/*!
@function mbuf_copyback
errno_t mbuf_copyback(mbuf_t mbuf, size_t offset, size_t length,
const void *data, mbuf_how_t how);
-#ifdef KERNEL_PRIVATE
-/*!
- @function mbuf_mclref
- @discussion Incrememnt the reference count of the cluster.
- @param mbuf The mbuf with the cluster to increment the refcount of.
- @result 0 upon success otherwise the errno error.
- */
-int mbuf_mclref(mbuf_t mbuf);
-
-/*!
- @function mbuf_mclunref
- @discussion Decrement the reference count of the cluster.
- @param mbuf The mbuf with the cluster to decrement the refcount of.
- @result 0 upon success otherwise the errno error.
- */
-int mbuf_mclunref(mbuf_t mbuf);
-#endif
-
/*!
@function mbuf_mclhasreference
@discussion Check if a cluster of an mbuf is referenced by another mbuf.
@param mbuf The mbuf.
@result The next mbuf in the chain.
*/
-mbuf_t mbuf_next(mbuf_t mbuf);
+mbuf_t mbuf_next(const mbuf_t mbuf);
/*!
@function mbuf_setnext
@param mbuf The mbuf.
@result The nextpkt.
*/
-mbuf_t mbuf_nextpkt(mbuf_t mbuf);
+mbuf_t mbuf_nextpkt(const mbuf_t mbuf);
/*!
@function mbuf_setnextpkt
@param mbuf The mbuf.
@result The length.
*/
-size_t mbuf_len(mbuf_t mbuf);
+size_t mbuf_len(const mbuf_t mbuf);
/*!
@function mbuf_setlen
@param mbuf The mbuf.
@result The maximum lenght of data for this mbuf.
*/
-size_t mbuf_maxlen(mbuf_t mbuf);
+size_t mbuf_maxlen(const mbuf_t mbuf);
/*!
@function mbuf_type
@param mbuf The mbuf.
@result The type.
*/
-mbuf_type_t mbuf_type(mbuf_t mbuf);
+mbuf_type_t mbuf_type(const mbuf_t mbuf);
/*!
@function mbuf_settype
@param mbuf The mbuf.
@result The flags.
*/
-mbuf_flags_t mbuf_flags(mbuf_t mbuf);
+mbuf_flags_t mbuf_flags(const mbuf_t mbuf);
/*!
@function mbuf_setflags
@param mbuf The mbuf to which the packet header will be copied.
@result 0 upon success otherwise the errno error.
*/
-errno_t mbuf_copy_pkthdr(mbuf_t dest, mbuf_t src);
+errno_t mbuf_copy_pkthdr(mbuf_t dest, const mbuf_t src);
/*!
@function mbuf_pkthdr_len
be changed.
@result The length, in bytes, of the packet.
*/
-size_t mbuf_pkthdr_len(mbuf_t mbuf);
+size_t mbuf_pkthdr_len(const mbuf_t mbuf);
/*!
@function mbuf_pkthdr_setlen
@discussion Sets the length of the packet in the packet header.
@param mbuf The mbuf containing the packet header.
@param len The new length of the packet.
- @result 0 upon success otherwise the errno error.
*/
void mbuf_pkthdr_setlen(mbuf_t mbuf, size_t len);
+/*!
+ @function mbuf_pkthdr_adjustlen
+ @discussion Adjusts the length of the packet in the packet header.
+ @param mbuf The mbuf containing the packet header.
+ @param amount The number of bytes to adjust the packet header length
+ field by.
+ */
+void mbuf_pkthdr_adjustlen(mbuf_t mbuf, int amount);
+
/*!
@function mbuf_pkthdr_rcvif
- @discussion Returns a reference to the interface the packet was
- received on. Increments the reference count of the interface
- before returning. Caller is responsible for releasing
- the reference by calling ifnet_release.
+ @discussion Returns the interface the packet was received on. This
+ funciton does not modify the reference count of the interface.
+ The interface is only valid for as long as the mbuf is not freed
+ and the rcvif for the mbuf is not changed. Take a reference on
+ the interface that you will release later before doing any of
+ the following: free the mbuf, change the rcvif, pass the mbuf to
+ any function that may free the mbuf or change the rcvif.
@param mbuf The mbuf containing the packet header.
@result A reference to the interface.
*/
-ifnet_t mbuf_pkthdr_rcvif(mbuf_t mbuf);
+ifnet_t mbuf_pkthdr_rcvif(const mbuf_t mbuf);
/*!
@function mbuf_pkthdr_setrcvif
@param ifnet A reference to an interface.
@result 0 upon success otherwise the errno error.
*/
-errno_t mbuf_pkthdr_setrcvif(mbuf_t mbuf, ifnet_t ifnet);
+errno_t mbuf_pkthdr_setrcvif(mbuf_t mbuf, ifnet_t ifp);
/*!
@function mbuf_pkthdr_header
@param mbuf The mbuf containing the packet header.
@result A pointer to the packet header.
*/
-void* mbuf_pkthdr_header(mbuf_t mbuf);
+void* mbuf_pkthdr_header(const mbuf_t mbuf);
/*!
@function mbuf_pkthdr_setheader
@result 0 upon success otherwise the errno error.
*/
void mbuf_pkthdr_setheader(mbuf_t mbuf, void* header);
-#ifdef KERNEL_PRIVATE
-
-/* mbuf aux data */
-
-/*!
- @function mbuf_aux_add
- @discussion Adds auxiliary data in the form of an mbuf.
- @param mbuf The mbuf to add aux data to.
- @param family The protocol family of the aux data to add.
- @param type The mbuf type of the aux data to add.
- @param aux_mbuf The aux mbuf allocated for you.
- @result 0 upon success otherwise the errno error.
- */
-errno_t mbuf_aux_add(mbuf_t mbuf, int family, mbuf_type_t type, mbuf_t *aux_mbuf);
-
-/*!
- @function mbuf_aux_find
- @discussion Finds auxiliary data attached to an mbuf.
- @param mbuf The mbuf to find aux data on.
- @param family The protocol family of the aux data to add.
- @param type The mbuf type of the aux data to add.
- @result The aux data mbuf or NULL if there isn't one.
- */
-mbuf_t mbuf_aux_find(mbuf_t mbuf, int family, mbuf_type_t type);
-
-/*!
- @function mbuf_aux_delete
- @discussion Free an mbuf used as aux data and disassosciate it from
- the mbuf.
- @param mbuf The mbuf to find aux data on.
- @param aux The aux data to free.
- */
-void mbuf_aux_delete(mbuf_t mbuf, mbuf_t aux);
-#endif /* KERNEL_PRIVATE */
/* Checksums */
errno_t mbuf_clear_vlan_tag(mbuf_t mbuf);
#ifdef KERNEL_PRIVATE
-/*!
+/*
@function mbuf_set_csum_requested
@discussion This function is used by the stack to indicate which
checksums should be calculated in hardware. The stack normally
mbuf_csum_performed_flags_t flags, u_int32_t value);
#ifdef KERNEL_PRIVATE
-/*!
+/*
@function mbuf_get_csum_performed
@discussion This is used by the stack to determine which checksums
were calculated in hardware on the inbound path.
*/
errno_t mbuf_clear_csum_performed(mbuf_t mbuf);
+/*!
+ @function mbuf_inet_cksum
+ @discussions Calculates 16-bit 1's complement Internet checksum of the
+ transport segment with or without the pseudo header checksum
+ of a given IPv4 packet. If the caller specifies a non-zero
+ transport protocol, the checksum returned will also include
+ the pseudo header checksum for the corresponding transport
+ header. Otherwise, no header parsing will be done and the
+ caller may use this to calculate the Internet checksum of
+ an arbitrary span of data.
+
+ This routine does not modify the contents of the packet. If
+ the caller specifies a non-zero protocol and/or offset, the
+ routine expects the complete protocol header to be present
+ at the beginning of the first mbuf.
+ @param mbuf The mbuf (or chain of mbufs) containing the packet.
+ @param protocol A zero or non-zero value. A non-zero value specifies
+ the transport protocol used for pseudo header checksum.
+ @param offset A zero or non-zero value; if the latter, it specifies
+ the offset of the transport header from the beginning of mbuf.
+ @param length The total (non-zero) length of the transport segment.
+ @param csum Pointer to the checksum variable; upon success, this
+ routine will return the calculated Internet checksum through
+ this variable. The caller must set it to a non-NULL value.
+ @result 0 upon success otherwise the errno error.
+ */
+errno_t mbuf_inet_cksum(mbuf_t mbuf, int protocol, u_int32_t offset,
+ u_int32_t length, u_int16_t *csum);
+
+/*!
+ @function mbuf_inet6_cksum
+ @discussions Calculates 16-bit 1's complement Internet checksum of the
+ transport segment with or without the pseudo header checksum
+ of a given IPv6 packet. If the caller specifies a non-zero
+ transport protocol, the checksum returned will also include
+ the pseudo header checksum for the corresponding transport
+ header. Otherwise, no header parsing will be done and the
+ caller may use this to calculate the Internet checksum of
+ an arbitrary span of data.
+
+ This routine does not modify the contents of the packet. If
+ the caller specifies a non-zero protocol and/or offset, the
+ routine expects the complete protocol header(s) to be present
+ at the beginning of the first mbuf.
+ @param mbuf The mbuf (or chain of mbufs) containing the packet.
+ @param protocol A zero or non-zero value. A non-zero value specifies
+ the transport protocol used for pseudo header checksum.
+ @param offset A zero or non-zero value; if the latter, it specifies
+ the offset of the transport header from the beginning of mbuf.
+ @param length The total (non-zero) length of the transport segment.
+ @param csum Pointer to the checksum variable; upon success, this
+ routine will return the calculated Internet checksum through
+ this variable. The caller must set it to a non-NULL value.
+ @result 0 upon success otherwise the errno error.
+ */
+errno_t mbuf_inet6_cksum(mbuf_t mbuf, int protocol, u_int32_t offset,
+ u_int32_t length, u_int16_t *csum);
+
/* mbuf tags */
/*!
} \
}
-
+__END_DECLS
#endif
projects / apple / xnu.git / blobdiff