Ben Pfaff
60a87c9b00
We want to allow multiple OpenFlow connections to a switch, so that dpctl and other management tools can also connect to a switch that is connecte to the controller. These tools will want to fetch the information in the data_hello message, but currently this can only be done by sending a control_hello message, which changes the switch configuration state. So breaking the hello messages up into multiple different messages, only some of which affect configuration state, cures the problem. Also, clean up the kernel datapath a bit, by adding helper functions for allocating and resizing Generic Netlink messages that encapsulate OpenFlow messages.
82 lines
3.3 KiB
C
82 lines
3.3 KiB
C
/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
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* Junior University
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*
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* We are making the OpenFlow specification and associated documentation
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* (Software) available for public use and benefit with the expectation
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* that others will use, modify and enhance the Software and contribute
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* those enhancements back to the community. However, since we would
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* like to make the Software available for broadest use, with as few
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* restrictions as possible permission is hereby granted, free of
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* charge, to any person obtaining a copy of this Software to deal in
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* the Software under the copyrights without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* The name and trademarks of copyright holder(s) may NOT be used in
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* advertising or publicity pertaining to the Software or any
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* derivatives without specific, written prior permission.
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*/
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#ifndef BUFFER_H
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#define BUFFER_H 1
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#include <stddef.h>
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/* Buffer for holding arbitrary data. A buffer is automatically reallocated as
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* necessary if it grows too large for the available memory. */
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struct buffer {
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void *base; /* First byte of area malloc()'d area. */
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size_t allocated; /* Number of bytes allocated. */
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void *data; /* First byte actually in use. */
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size_t size; /* Number of bytes in use. */
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void *l2; /* Link-level header. */
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void *l3; /* Network-level header. */
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void *l4; /* Transport-level header. */
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struct buffer *next; /* Next in a list of buffers. */
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};
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void buffer_use(struct buffer *, void *, size_t);
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void buffer_init(struct buffer *, size_t);
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void buffer_uninit(struct buffer *);
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void buffer_reinit(struct buffer *, size_t);
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struct buffer *buffer_new(size_t);
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struct buffer *buffer_clone(const struct buffer *);
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void buffer_delete(struct buffer *);
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void *buffer_at(const struct buffer *, size_t offset, size_t size);
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void *buffer_at_assert(const struct buffer *, size_t offset, size_t size);
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void *buffer_tail(const struct buffer *);
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void *buffer_end(const struct buffer *);
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void *buffer_put_uninit(struct buffer *, size_t);
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void *buffer_put(struct buffer *, const void *, size_t);
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void *buffer_push_uninit(struct buffer *b, size_t);
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size_t buffer_headroom(struct buffer *);
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size_t buffer_tailroom(struct buffer *);
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void buffer_reserve_tailroom(struct buffer *, size_t);
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void buffer_clear(struct buffer *);
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void buffer_pull(struct buffer *, size_t);
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#endif /* buffer.h */
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