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.
25 #include "netdev-dpdk.h"
31 enum OVS_PACKED_ENUM ofpbuf_source {
32 OFPBUF_MALLOC, /* Obtained via malloc(). */
33 OFPBUF_STACK, /* Un-movable stack space or static buffer. */
34 OFPBUF_STUB, /* Starts on stack, may expand into heap. */
35 OFPBUF_DPDK, /* buffer data is from DPDK allocated memory.
36 ref to build_ofpbuf() in netdev-dpdk. */
39 /* Buffer for holding arbitrary data. An ofpbuf is automatically reallocated
40 * as necessary if it grows too large for the available memory. */
42 void *base; /* First byte of allocated space. */
43 uint32_t allocated; /* Number of bytes allocated. */
44 uint32_t size; /* Number of bytes in use. */
45 void *data; /* First byte actually in use. */
47 void *l2; /* Link-level header. */
48 uint16_t l2_5_ofs; /* MPLS label stack offset from l2, or
50 uint16_t l3_ofs; /* Network-level header offset from l2, or
52 uint16_t l4_ofs; /* Transport-level header offset from l2, or
54 enum ofpbuf_source source; /* Source of memory allocated as 'base'. */
55 struct list list_node; /* Private list element for use by owner. */
57 void *private_p; /* private pointer for use by dpdk */
61 void * ofpbuf_resize_l2(struct ofpbuf *, int increment);
62 void * ofpbuf_resize_l2_5(struct ofpbuf *, int increment);
63 static inline void * ofpbuf_get_l2_5(const struct ofpbuf *);
64 static inline void ofpbuf_set_l2_5(struct ofpbuf *, void *);
65 static inline void * ofpbuf_get_l3(const struct ofpbuf *);
66 static inline void ofpbuf_set_l3(struct ofpbuf *, void *);
67 static inline void * ofpbuf_get_l4(const struct ofpbuf *);
68 static inline void ofpbuf_set_l4(struct ofpbuf *, void *);
69 static inline size_t ofpbuf_get_l4_size(const struct ofpbuf *);
70 static inline const void *ofpbuf_get_tcp_payload(const struct ofpbuf *);
71 static inline const void *ofpbuf_get_udp_payload(const struct ofpbuf *);
72 static inline const void *ofpbuf_get_sctp_payload(const struct ofpbuf *);
73 static inline const void *ofpbuf_get_icmp_payload(const struct ofpbuf *);
75 void ofpbuf_use(struct ofpbuf *, void *, size_t);
76 void ofpbuf_use_stack(struct ofpbuf *, void *, size_t);
77 void ofpbuf_use_stub(struct ofpbuf *, void *, size_t);
78 void ofpbuf_use_const(struct ofpbuf *, const void *, size_t);
80 void ofpbuf_init(struct ofpbuf *, size_t);
81 void ofpbuf_uninit(struct ofpbuf *);
82 static inline void *ofpbuf_get_uninit_pointer(struct ofpbuf *);
83 void ofpbuf_reinit(struct ofpbuf *, size_t);
85 struct ofpbuf *ofpbuf_new(size_t);
86 struct ofpbuf *ofpbuf_new_with_headroom(size_t, size_t headroom);
87 struct ofpbuf *ofpbuf_clone(const struct ofpbuf *);
88 struct ofpbuf *ofpbuf_clone_with_headroom(const struct ofpbuf *,
90 struct ofpbuf *ofpbuf_clone_data(const void *, size_t);
91 struct ofpbuf *ofpbuf_clone_data_with_headroom(const void *, size_t,
93 static inline void ofpbuf_delete(struct ofpbuf *);
95 static inline void *ofpbuf_at(const struct ofpbuf *, size_t offset,
97 static inline void *ofpbuf_at_assert(const struct ofpbuf *, size_t offset,
99 static inline void *ofpbuf_tail(const struct ofpbuf *);
100 static inline void *ofpbuf_end(const struct ofpbuf *);
102 void *ofpbuf_put_uninit(struct ofpbuf *, size_t);
103 void *ofpbuf_put_zeros(struct ofpbuf *, size_t);
104 void *ofpbuf_put(struct ofpbuf *, const void *, size_t);
105 char *ofpbuf_put_hex(struct ofpbuf *, const char *s, size_t *n);
106 void ofpbuf_reserve(struct ofpbuf *, size_t);
107 void ofpbuf_reserve_with_tailroom(struct ofpbuf *b, size_t headroom,
109 void *ofpbuf_push_uninit(struct ofpbuf *b, size_t);
110 void *ofpbuf_push_zeros(struct ofpbuf *, size_t);
111 void *ofpbuf_push(struct ofpbuf *b, const void *, size_t);
113 static inline size_t ofpbuf_headroom(const struct ofpbuf *);
114 static inline size_t ofpbuf_tailroom(const struct ofpbuf *);
115 void ofpbuf_prealloc_headroom(struct ofpbuf *, size_t);
116 void ofpbuf_prealloc_tailroom(struct ofpbuf *, size_t);
117 void ofpbuf_trim(struct ofpbuf *);
118 void ofpbuf_padto(struct ofpbuf *, size_t);
119 void ofpbuf_shift(struct ofpbuf *, int);
121 static inline void ofpbuf_clear(struct ofpbuf *);
122 static inline void *ofpbuf_pull(struct ofpbuf *, size_t);
123 static inline void *ofpbuf_try_pull(struct ofpbuf *, size_t);
125 void *ofpbuf_steal_data(struct ofpbuf *);
127 char *ofpbuf_to_string(const struct ofpbuf *, size_t maxbytes);
128 static inline struct ofpbuf *ofpbuf_from_list(const struct list *);
129 void ofpbuf_list_delete(struct list *);
130 static inline bool ofpbuf_equal(const struct ofpbuf *, const struct ofpbuf *);
133 /* Returns a pointer that may be passed to free() to accomplish the same thing
134 * as ofpbuf_uninit(b). The return value is a null pointer if ofpbuf_uninit()
135 * would not free any memory. */
136 static inline void *ofpbuf_get_uninit_pointer(struct ofpbuf *b)
138 /* XXX: If 'source' is OFPBUF_DPDK memory gets leaked! */
139 return b && b->source == OFPBUF_MALLOC ? b->base : NULL;
142 /* Frees memory that 'b' points to, as well as 'b' itself. */
143 static inline void ofpbuf_delete(struct ofpbuf *b)
151 /* If 'b' contains at least 'offset + size' bytes of data, returns a pointer to
152 * byte 'offset'. Otherwise, returns a null pointer. */
153 static inline void *ofpbuf_at(const struct ofpbuf *b, size_t offset,
156 return offset + size <= b->size ? (char *) b->data + offset : NULL;
159 /* Returns a pointer to byte 'offset' in 'b', which must contain at least
160 * 'offset + size' bytes of data. */
161 static inline void *ofpbuf_at_assert(const struct ofpbuf *b, size_t offset,
164 ovs_assert(offset + size <= b->size);
165 return ((char *) b->data) + offset;
168 /* Returns the byte following the last byte of data in use in 'b'. */
169 static inline void *ofpbuf_tail(const struct ofpbuf *b)
171 return (char *) b->data + b->size;
174 /* Returns the byte following the last byte allocated for use (but not
175 * necessarily in use) by 'b'. */
176 static inline void *ofpbuf_end(const struct ofpbuf *b)
178 return (char *) b->base + b->allocated;
181 /* Returns the number of bytes of headroom in 'b', that is, the number of bytes
182 * of unused space in ofpbuf 'b' before the data that is in use. (Most
183 * commonly, the data in a ofpbuf is at its beginning, and thus the ofpbuf's
185 static inline size_t ofpbuf_headroom(const struct ofpbuf *b)
187 return (char*)b->data - (char*)b->base;
190 /* Returns the number of bytes that may be appended to the tail end of ofpbuf
191 * 'b' before the ofpbuf must be reallocated. */
192 static inline size_t ofpbuf_tailroom(const struct ofpbuf *b)
194 return (char*)ofpbuf_end(b) - (char*)ofpbuf_tail(b);
197 /* Clears any data from 'b'. */
198 static inline void ofpbuf_clear(struct ofpbuf *b)
204 /* Removes 'size' bytes from the head end of 'b', which must contain at least
205 * 'size' bytes of data. Returns the first byte of data removed. */
206 static inline void *ofpbuf_pull(struct ofpbuf *b, size_t size)
208 void *data = b->data;
209 ovs_assert(b->size >= size);
210 b->data = (char*)b->data + size;
215 /* If 'b' has at least 'size' bytes of data, removes that many bytes from the
216 * head end of 'b' and returns the first byte removed. Otherwise, returns a
217 * null pointer without modifying 'b'. */
218 static inline void *ofpbuf_try_pull(struct ofpbuf *b, size_t size)
220 return b->size >= size ? ofpbuf_pull(b, size) : NULL;
223 static inline struct ofpbuf *ofpbuf_from_list(const struct list *list)
225 return CONTAINER_OF(list, struct ofpbuf, list_node);
228 static inline bool ofpbuf_equal(const struct ofpbuf *a, const struct ofpbuf *b)
230 return a->size == b->size && memcmp(a->data, b->data, a->size) == 0;
233 static inline void * ofpbuf_get_l2_5(const struct ofpbuf *b)
235 return b->l2_5_ofs != UINT16_MAX ? (char *)b->l2 + b->l2_5_ofs : NULL;
238 static inline void ofpbuf_set_l2_5(struct ofpbuf *b, void *l2_5)
240 b->l2_5_ofs = l2_5 ? (char *)l2_5 - (char *)b->l2 : UINT16_MAX;
243 static inline void * ofpbuf_get_l3(const struct ofpbuf *b)
245 return b->l3_ofs != UINT16_MAX ? (char *)b->l2 + b->l3_ofs : NULL;
248 static inline void ofpbuf_set_l3(struct ofpbuf *b, void *l3)
250 b->l3_ofs = l3 ? (char *)l3 - (char *)b->l2 : UINT16_MAX;
253 static inline void * ofpbuf_get_l4(const struct ofpbuf *b)
255 return b->l4_ofs != UINT16_MAX ? (char *)b->l2 + b->l4_ofs : NULL;
258 static inline void ofpbuf_set_l4(struct ofpbuf *b, void *l4)
260 b->l4_ofs = l4 ? (char *)l4 - (char *)b->l2 : UINT16_MAX;
263 static inline size_t ofpbuf_get_l4_size(const struct ofpbuf *b)
265 return b->l4_ofs != UINT16_MAX
266 ? (const char *)ofpbuf_tail(b) - (const char *)ofpbuf_get_l4(b) : 0;
269 static inline const void *ofpbuf_get_tcp_payload(const struct ofpbuf *b)
271 size_t l4_size = ofpbuf_get_l4_size(b);
273 if (OVS_LIKELY(l4_size >= TCP_HEADER_LEN)) {
274 struct tcp_header *tcp = ofpbuf_get_l4(b);
275 int tcp_len = TCP_OFFSET(tcp->tcp_ctl) * 4;
277 if (OVS_LIKELY(tcp_len >= TCP_HEADER_LEN && tcp_len <= l4_size)) {
278 return (const char *)tcp + tcp_len;
284 static inline const void *ofpbuf_get_udp_payload(const struct ofpbuf *b)
286 return OVS_LIKELY(ofpbuf_get_l4_size(b) >= UDP_HEADER_LEN)
287 ? (const char *)ofpbuf_get_l4(b) + UDP_HEADER_LEN : NULL;
290 static inline const void *ofpbuf_get_sctp_payload(const struct ofpbuf *b)
292 return OVS_LIKELY(ofpbuf_get_l4_size(b) >= SCTP_HEADER_LEN)
293 ? (const char *)ofpbuf_get_l4(b) + SCTP_HEADER_LEN : NULL;
296 static inline const void *ofpbuf_get_icmp_payload(const struct ofpbuf *b)
298 return OVS_LIKELY(ofpbuf_get_l4_size(b) >= ICMP_HEADER_LEN)
299 ? (const char *)ofpbuf_get_l4(b) + ICMP_HEADER_LEN : NULL;
306 #endif /* ofpbuf.h */