2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
30 OFPBUF_MALLOC, /* Obtained via malloc(). */
31 OFPBUF_STACK, /* Un-movable stack space or static buffer. */
32 OFPBUF_STUB, /* Starts on stack, may expand into heap. */
33 OFPBUF_DPDK, /* buffer data is from DPDK allocated memory.
34 ref to build_ofpbuf() in netdev-dpdk. */
37 /* Buffer for holding arbitrary data. An ofpbuf is automatically reallocated
38 * as necessary if it grows too large for the available memory. */
40 void *base; /* First byte of allocated space. */
41 size_t allocated; /* Number of bytes allocated. */
42 enum ofpbuf_source source; /* Source of memory allocated as 'base'. */
44 void *data; /* First byte actually in use. */
45 size_t size; /* Number of bytes in use. */
47 void *l2; /* Link-level header. */
48 void *l2_5; /* MPLS label stack */
49 void *l3; /* Network-level header. */
50 void *l4; /* Transport-level header. */
51 void *l7; /* Application data. */
53 struct list list_node; /* Private list element for use by owner. */
54 void *private_p; /* Private pointer for use by owner. */
57 void ofpbuf_use(struct ofpbuf *, void *, size_t);
58 void ofpbuf_use_stack(struct ofpbuf *, void *, size_t);
59 void ofpbuf_use_stub(struct ofpbuf *, void *, size_t);
60 void ofpbuf_use_const(struct ofpbuf *, const void *, size_t);
62 void ofpbuf_init(struct ofpbuf *, size_t);
63 void ofpbuf_uninit(struct ofpbuf *);
64 void *ofpbuf_get_uninit_pointer(struct ofpbuf *);
65 void ofpbuf_reinit(struct ofpbuf *, size_t);
67 struct ofpbuf *ofpbuf_new(size_t);
68 struct ofpbuf *ofpbuf_new_with_headroom(size_t, size_t headroom);
69 struct ofpbuf *ofpbuf_clone(const struct ofpbuf *);
70 struct ofpbuf *ofpbuf_clone_with_headroom(const struct ofpbuf *,
72 struct ofpbuf *ofpbuf_clone_data(const void *, size_t);
73 struct ofpbuf *ofpbuf_clone_data_with_headroom(const void *, size_t,
75 void ofpbuf_delete(struct ofpbuf *);
77 void *ofpbuf_at(const struct ofpbuf *, size_t offset, size_t size);
78 void *ofpbuf_at_assert(const struct ofpbuf *, size_t offset, size_t size);
79 void *ofpbuf_tail(const struct ofpbuf *);
80 void *ofpbuf_end(const struct ofpbuf *);
82 void *ofpbuf_put_uninit(struct ofpbuf *, size_t);
83 void *ofpbuf_put_zeros(struct ofpbuf *, size_t);
84 void *ofpbuf_put(struct ofpbuf *, const void *, size_t);
85 char *ofpbuf_put_hex(struct ofpbuf *, const char *s, size_t *n);
86 void ofpbuf_reserve(struct ofpbuf *, size_t);
87 void ofpbuf_reserve_with_tailroom(struct ofpbuf *b, size_t headroom,
89 void *ofpbuf_push_uninit(struct ofpbuf *b, size_t);
90 void *ofpbuf_push_zeros(struct ofpbuf *, size_t);
91 void *ofpbuf_push(struct ofpbuf *b, const void *, size_t);
93 size_t ofpbuf_headroom(const struct ofpbuf *);
94 size_t ofpbuf_tailroom(const struct ofpbuf *);
95 void ofpbuf_prealloc_headroom(struct ofpbuf *, size_t);
96 void ofpbuf_prealloc_tailroom(struct ofpbuf *, size_t);
97 void ofpbuf_trim(struct ofpbuf *);
98 void ofpbuf_padto(struct ofpbuf *, size_t);
99 void ofpbuf_shift(struct ofpbuf *, int);
101 void ofpbuf_clear(struct ofpbuf *);
102 void *ofpbuf_pull(struct ofpbuf *, size_t);
103 void *ofpbuf_try_pull(struct ofpbuf *, size_t);
105 void *ofpbuf_steal_data(struct ofpbuf *);
107 char *ofpbuf_to_string(const struct ofpbuf *, size_t maxbytes);
109 static inline struct ofpbuf *ofpbuf_from_list(const struct list *list)
111 return CONTAINER_OF(list, struct ofpbuf, list_node);
113 void ofpbuf_list_delete(struct list *);
116 ofpbuf_equal(const struct ofpbuf *a, const struct ofpbuf *b)
118 return a->size == b->size && memcmp(a->data, b->data, a->size) == 0;
125 #endif /* ofpbuf.h */