Line data Source code
1 : #ifndef HEADER_fd_src_ballet_shred_fd_shred_h
2 : #define HEADER_fd_src_ballet_shred_fd_shred_h
3 :
4 : #include "../bmtree/fd_bmtree.h"
5 :
6 : /* Shreds form the on-wire representation of Solana block data
7 : optimized for transmission over unreliable links/WAN.
8 :
9 : ### Layout
10 :
11 : Each shred is 1228 bytes long.
12 :
13 : +------------------------+
14 : | Common Shred Header | 83 bytes
15 : +------------------------+
16 : | Data Header | 5 bytes
17 : | or Coding Header | or 6 bytes
18 : +------------------------+
19 : | | variable
20 : | Payload | length
21 : | |
22 : +------------------------+
23 :
24 : for Merkle shreds, followed by:
25 :
26 : +------------------------+
27 : | (Chained merkle root) | 32 bytes
28 : +------------------------+
29 : +------------------------+
30 : | Merkle node #0 (root) | 20 bytes
31 : +------------------------+
32 : | Merkle node #1 | 20 bytes
33 : ..........................
34 :
35 : for resigned shreds, followed by:
36 :
37 : +------------------------+
38 : | signature | 64 bytes
39 : ..........................
40 :
41 : ### Shredding
42 :
43 : For a given input data blob (usually an entry batch),
44 : data shreds are derived by simply splitting up the blob into subslices.
45 :
46 : Each shred is sized such that it fits into a single UDP packet,
47 : i.e. currently bound by the generally accepted IPv6 MTU of 1280 bytes.
48 :
49 : ### Forward Error Correction
50 :
51 : Coding shreds implement Reed-Solomon error correction to provide tolerance against packet loss.
52 :
53 : Each data shred is first assigned an FEC set.
54 : For the vector of data shreds in each set, a corresponding vector of coding shreds contains parity data.
55 :
56 : FEC sets and entry batches do not necessarily align.
57 :
58 : ### Merkle Inclusion Proofs
59 :
60 : Data and coding shreds come in two variants respectively: legacy and merkle.
61 : Merkle shreds extend legacy shreds by adding FEC set inclusion proofs.
62 :
63 : It allows the block producer to commit to the vector of shreds that make up an FEC set.
64 : The inclusion proof is used to verify whether a shred is part of the FEC set commitment.
65 :
66 : The length of the inclusion proof is indicated by the variant field.
67 :
68 : ### resigned shreds
69 :
70 : Resigned shreds allow for an additional signature to be added on to lock down
71 : the retransmitter for turbine propagation
72 :
73 : ### Authentication
74 :
75 : Shreds are signed by the block producer.
76 : Consequently, only the block producer is able to create valid shreds for any given block. */
77 :
78 : #include "../fd_ballet.h"
79 :
80 : /* FD_SHRED_MAX_SZ: The max byte size of a shred.
81 : This limit derives from the IPv6 MTU of 1280 bytes, minus 48 bytes
82 : for the UDP/IPv6 headers and another 4 bytes for good measure. Most
83 : shreds are this size, but Merkle data shreds may be smaller. */
84 32960070 : #define FD_SHRED_MAX_SZ (1228UL)
85 : /* FD_SHRED_MIN_SZ: The minimum byte size of a shred.
86 : A code shred of the max size covers a data shred of the minimum size
87 : with no padding. */
88 29898111 : #define FD_SHRED_MIN_SZ (1203UL)
89 : /* FD_SHRED_DATA_HEADER_SZ: size of all headers for data type shreds. */
90 18331671 : #define FD_SHRED_DATA_HEADER_SZ (0x58UL)
91 : /* FD_SHRED_CODE_HEADER_SZ: size of all headers for coding type shreds. */
92 6219558 : #define FD_SHRED_CODE_HEADER_SZ (0x59UL)
93 : /* This is a conservative bound.
94 : It's possible for a modified validator to create a data shred with
95 : this much payload.
96 : A validator that follows the default shredding policy should have
97 : payloads of no more than 1015 bytes.
98 : In general, shreds that are chained or resigned should have smaller
99 : payloads and a tigher bound. */
100 : #define FD_SHRED_DATA_PAYLOAD_MAX (FD_SHRED_MIN_SZ-FD_SHRED_DATA_HEADER_SZ)
101 :
102 : /* FD_SHRED_TYPE_* identifies the type of a shred.
103 : It is located at the four high bits of byte 0x40 (64) of the shred header
104 : and can be extracted using the fd_shred_type() function. */
105 : /* FD_SHRED_TYPE_LEGACY_DATA: A shred carrying raw binary data. */
106 20912400 : #define FD_SHRED_TYPE_LEGACY_DATA ((uchar)0xA0)
107 : /* FD_SHRED_TYPE_LEGACY_CODE: A shred carrying Reed-Solomon ECC. */
108 : #define FD_SHRED_TYPE_LEGACY_CODE ((uchar)0x50)
109 : /* FD_SHRED_TYPE_MERKLE_DATA: A shred carrying raw binary data and a merkle inclusion proof. */
110 200178 : #define FD_SHRED_TYPE_MERKLE_DATA ((uchar)0x80)
111 : /* FD_SHRED_TYPE_MERKLE_CODE: A shred carrying Reed-Solomon ECC and a merkle inclusion proof. */
112 30462639 : #define FD_SHRED_TYPE_MERKLE_CODE ((uchar)0x40)
113 : /* FD_SHRED_TYPE_MERKLE_DATA_CHAINED: A shred carrying raw binary data and a chained merkle inclusion proof. */
114 280089 : #define FD_SHRED_TYPE_MERKLE_DATA_CHAINED ((uchar)0x90)
115 : /* FD_SHRED_TYPE_MERKLE_CODE_CHAINED: A shred carrying Reed-Solomon ECC and a chained merkle inclusion proof. */
116 279225 : #define FD_SHRED_TYPE_MERKLE_CODE_CHAINED ((uchar)0x60)
117 :
118 : /* FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED: A shred carrying raw binary data and a chained merkle inclusion proof and resigned. */
119 24380181 : #define FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED ((uchar)0xB0)
120 : /* FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED: A shred carrying Reed-Solomon ECC and a chained merkle inclusion proof and resigned. */
121 24378549 : #define FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED ((uchar)0x70)
122 :
123 : /* FD_SHRED_TYPEMASK_DATA: bitwise AND with type matches data shred */
124 : #define FD_SHRED_TYPEMASK_DATA FD_SHRED_TYPE_MERKLE_DATA
125 : /* FD_SHRED_TYPEMASK_CODE: bitwise AND with type matches code shred */
126 29869815 : #define FD_SHRED_TYPEMASK_CODE FD_SHRED_TYPE_MERKLE_CODE
127 :
128 : /* FD_SHRED_MERKLE_ROOT_SZ: the size of a merkle tree root in bytes. */
129 24302064 : #define FD_SHRED_MERKLE_ROOT_SZ (32UL)
130 : /* FD_SHRED_MERKLE_NODE_SZ: the size of a merkle inclusion proof node in bytes. */
131 24281250 : #define FD_SHRED_MERKLE_NODE_SZ (20UL)
132 : /* FD_SHRED_MERKLE_LAYER_CNT: the count of inclusion proof layers in the binary merkle tree. */
133 6027 : #define FD_SHRED_MERKLE_LAYER_CNT (7UL)
134 : /* FD_SHRED_SIGNATURE_SZ: the size of a signature in a shred. */
135 27221403 : #define FD_SHRED_SIGNATURE_SZ (64UL)
136 : /* A merkle inclusion proof node. */
137 : typedef uchar fd_shred_merkle_t[FD_SHRED_MERKLE_NODE_SZ];
138 :
139 : FD_STATIC_ASSERT( sizeof(fd_bmtree_node_t) == FD_SHRED_MERKLE_ROOT_SZ, update FD_SHRED_MERKLE_ROOT_SZ );
140 :
141 : /* Constants relating to the data shred "flags" field. */
142 :
143 : /* Mask of the "reference tick" field in shred.data.flags */
144 0 : #define FD_SHRED_DATA_REF_TICK_MASK ((uchar)0x3f)
145 : /* Mask of the "slot complete" bit in shred.data.flags
146 : Indicates the last shred in a slot. */
147 0 : #define FD_SHRED_DATA_FLAG_SLOT_COMPLETE ((uchar)0x80)
148 : /* Mask of the "data batch complete" bit in shred.data.flags */
149 6789 : #define FD_SHRED_DATA_FLAG_DATA_COMPLETE ((uchar)0x40)
150 :
151 : /* Maximum number of data shreds in a slot, also maximum number of parity shreds in a slot */
152 624150 : #define FD_SHRED_BLK_MAX (1 << 15UL) /* 32,768 shreds */
153 :
154 : /* Many static bounds are specified around the assumption that this is a
155 : protocol limit on the max number of shreds in a slot. If this limit
156 : changes, all the relevant usages in other areas of the Firedancer
157 : codebase should be updated before modifying this assertion. */
158 :
159 : FD_STATIC_ASSERT( FD_SHRED_BLK_MAX == 32768, check all usages before changing this limit! );
160 :
161 : /* 36,536,320 bytes per slot */
162 : #define FD_SHRED_DATA_PAYLOAD_MAX_PER_SLOT (FD_SHRED_DATA_PAYLOAD_MAX * FD_SHRED_BLK_MAX)
163 :
164 : /* Offset of the shred variant. Used for parsing. */
165 : #define FD_SHRED_VARIANT_OFF 0x40
166 :
167 : /* Firedancer-specific internal error codes.
168 :
169 : These are not part of the Solana protocol. */
170 :
171 21 : #define FD_SHRED_EBATCH 0x4000 /* End of batch reached (success)
172 : no more shreds and found FD_SHRED_DATA_FLAG_DATA_COMPLETE */
173 9 : #define FD_SHRED_ESLOT 0x8000 /* End of slot reached (success)
174 : no more shreds and found FD_SHRED_DATA_FLAG_SLOT_COMPLETE */
175 0 : #define FD_SHRED_ENOMEM 12 /* Error: Target buffer too small */
176 0 : #define FD_SHRED_EINVAL 22 /* Error: Invalid shred data */
177 27 : #define FD_SHRED_EPIPE 32 /* Error: Expected data in source buffer, got EOF */
178 :
179 : /* Primary shred data structure.
180 : Relies heavily on packed fields and unaligned memory accesses. */
181 : struct __attribute__((packed)) fd_shred {
182 : /* Ed25519 signature over the shred
183 :
184 : For legacy type shreds, signs over content of the shred structure past this signature field.
185 : For merkle type shreds, signs over the first node of the inclusion proof (merkle root). */
186 : /* 0x00 */ fd_ed25519_sig_t signature;
187 :
188 : /* Shred variant specifier
189 : Consists of two four bit fields. (Deliberately not using bit fields here)
190 :
191 : The high four bits indicate the shred type:
192 : - 0101: legacy code
193 : - 1010: legacy data
194 : - 0100: merkle code
195 : - 0110: merkle code (chained)
196 : - 0111: merkle code (chained resigned)
197 : - 1000: merkle data
198 : - 1001: merkle data (chained)
199 : - 1011: merkle data (chained resigned)
200 :
201 : For legacy type shreds, the low four bits are set to static patterns.
202 : For merkle type shreds, the low four bits are set to the number of non-root nodes in the inclusion proof.
203 : For merkle code type shreds, the 3rd highest bit represents if the merkle tree is chained.
204 : For merkle data type shreds, the 4th highest bit represents if the merkle tree is chained.
205 : For merkle code type shreds, the 4th highest bit represents if the shred is resigned.
206 : For merkle data type shreds, the 3th highest bit represents if the shred is resigned.
207 : */
208 : /* 0x40 */ uchar variant;
209 :
210 : /* Slot number that this shred is part of */
211 : /* 0x41 */ ulong slot;
212 :
213 : /* Index of this shred within the slot */
214 : /* 0x49 */ uint idx;
215 :
216 : /* Hash of the genesis version and historical hard forks of the current chain */
217 : /* 0x4d */ ushort version;
218 :
219 : /* Index into the vector of FEC sets for this slot. For data shreds, fec_set_idx<=idx. */
220 : /* 0x4f */ uint fec_set_idx;
221 :
222 : union {
223 : /* Common data shred header */
224 : struct __attribute__((packed)) {
225 : /* Slot number difference between this block and the parent block.
226 : parent_off <= slot.
227 : Always greater than zero, except for slot 0, in which case the
228 : previous invariant forces this to be 0. */
229 : /* 0x53 */ ushort parent_off;
230 :
231 : /* Bit field (MSB first)
232 : See FD_SHRED_DATA_FLAG_*
233 :
234 : [XX.. ....] Block complete? 0b00=no 0b01=no 0b11=yes (implies Entry batch complete)
235 : [.X.. ....] Entry batch complete? 0b0=no 0b1=yes
236 : [..XX XXXX] Reference tick number */
237 : /* 0x55 */ uchar flags;
238 :
239 : /* Shred size: size of data shred headers (88 bytes) + payload length */
240 : /* 0x56 */ ushort size;
241 : } data;
242 :
243 : /* Common coding shred header */
244 : struct __attribute__((packed)) {
245 : /* Total number of data shreds in FEC set. Must be positive <= FD_REEDSOL_DATA_SHREDS_MAX. */
246 : /* 0x53 */ ushort data_cnt;
247 :
248 : /* Total number of coding shreds in FEC set. Must be positive <= FD_REEDSOL_CODE_SHREDS_MAX. */
249 : /* 0x55 */ ushort code_cnt;
250 :
251 : /* Index within the vector of coding shreds in FEC set. In [0,
252 : code_cnt). Also, shred.code.idx <= shred.idx. */
253 : /* 0x57 */ ushort idx;
254 : } code;
255 : };
256 : };
257 : typedef struct fd_shred fd_shred_t;
258 :
259 : FD_PROTOTYPES_BEGIN
260 :
261 : /* fd_shred_parse: Parses and validates an untrusted shred stored in
262 : bytes buf[i] for i in [0, sz). sz must be at least FD_SHRED_MIN_SZ bytes.
263 : Allows trailing data. max_shred_idx is the exclusive upper bound for
264 : data/parity shred indices within a slot, similar to max_shred_idx in
265 : fd_fec_resolver.
266 :
267 : The returned pointer either equals the input pointer or is NULL if
268 : the given shred is malformed or violates any invariants described
269 : above. */
270 : FD_FN_PURE fd_shred_t const *
271 : fd_shred_parse( uchar const * buf,
272 : ulong sz,
273 : ulong max_shred_idx );
274 :
275 : /* fd_shred_type: Returns the value of the shred's type field. (FD_SHRED_TYPE_*) */
276 : FD_FN_CONST static inline uchar
277 67903131 : fd_shred_type( uchar variant ) {
278 67903131 : return variant & 0xf0;
279 67903131 : }
280 :
281 : /* fd_shred_variant: Returns the encoded variant field
282 : given the shred type and merkle proof length. */
283 : FD_FN_CONST static inline uchar
284 : fd_shred_variant( uchar type,
285 15450897 : uchar merkle_cnt ) {
286 15450897 : if( FD_LIKELY( type==FD_SHRED_TYPE_LEGACY_DATA ) )
287 3060702 : merkle_cnt = 0x05;
288 15450897 : if( FD_LIKELY( type==FD_SHRED_TYPE_LEGACY_CODE ) )
289 3 : merkle_cnt = 0x0a;
290 15450897 : return (uchar)(type | merkle_cnt);
291 15450897 : }
292 :
293 : FD_FN_PURE static inline ulong
294 17839026 : fd_shred_sz( fd_shred_t const * shred ) {
295 17839026 : uchar type = fd_shred_type( shred->variant );
296 17839026 : return fd_ulong_if(
297 17839026 : type & FD_SHRED_TYPEMASK_CODE,
298 17839026 : FD_SHRED_MAX_SZ,
299 17839026 : fd_ulong_if( type==FD_SHRED_TYPE_LEGACY_DATA, shred->data.size, FD_SHRED_MIN_SZ)
300 17839026 : ); /* Legacy data */
301 17839026 : }
302 :
303 : /* fd_shred_header_sz: Returns the header size of a shred.
304 : Returns zero if the shred has an invalid variant.
305 :
306 : Accesses offsets up to FD_SHRED_HEADER_MIN_SZ. */
307 : FD_FN_CONST static inline ulong
308 26223 : fd_shred_header_sz( uchar variant ) {
309 26223 : uchar type = fd_shred_type( variant );
310 26223 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_DATA ) )
311 12822 : return FD_SHRED_DATA_HEADER_SZ;
312 13401 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_CODE ) )
313 13401 : return FD_SHRED_CODE_HEADER_SZ;
314 0 : return 0;
315 13401 : }
316 :
317 : /* fd_shred_merkle_cnt: Returns number of nodes in the merkle inclusion
318 : proof. Note that this excludes the root. Returns zero if the given
319 : shred is not a merkle variant. */
320 : FD_FN_CONST static inline uint
321 24107709 : fd_shred_merkle_cnt( uchar variant ) {
322 24107709 : uchar type = fd_shred_type( variant );
323 24107709 : if( FD_UNLIKELY( ( type == FD_SHRED_TYPE_LEGACY_DATA ) | ( type == FD_SHRED_TYPE_LEGACY_CODE ) ) )
324 69 : return 0;
325 24107640 : return (variant&0xfU);
326 24107709 : }
327 :
328 : /* fd_shred_merkle_sz: Returns the size in bytes of the merkle inclusion proof.
329 : Returns zero if the given shred is not a merkle variant. */
330 : FD_FN_CONST static inline ulong
331 24073734 : fd_shred_merkle_sz( uchar variant ) {
332 24073734 : return fd_shred_merkle_cnt( variant ) * FD_SHRED_MERKLE_NODE_SZ;
333 24073734 : }
334 :
335 :
336 : /* fd_shred_is_chained: Returns true if the shred is a chained merkle data or code shred. */
337 : FD_FN_CONST static inline uchar
338 88191 : fd_shred_is_chained( ulong type ) {
339 88191 : return (uchar)(
340 88191 : ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED )
341 88191 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED )
342 88191 : | ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED )
343 88191 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED ) );
344 88191 : }
345 :
346 : /* fd_shred_is_resigned: Returns true if the shred is resigned by the retransmitter */
347 : FD_FN_CONST static inline uchar
348 24101004 : fd_shred_is_resigned( ulong type ) {
349 24101004 : return ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED )
350 24101004 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED );
351 24101004 : }
352 :
353 : /* fd_shred_is_{data,code} return 1 if the provided shred type is one of
354 : the data (or code, respectively) types, and 0 if not. The value
355 : provided for type must be a valid shred type (one of the
356 : FD_SHRED_TYPE_* values). For the purposes of these functions,
357 : properties beyond data/code are ignored; e.g. a chained resigned
358 : Merkle data shred is considered a data shred. */
359 1821243 : FD_FN_CONST static inline uchar fd_shred_is_data( ulong type ) { return (type & 0xC0UL)==0x80UL; }
360 294 : FD_FN_CONST static inline uchar fd_shred_is_code( ulong type ) { return (type & 0xC0UL)==0x40UL; }
361 :
362 : /* fd_shred_swap_type: changes data into code or vice versa without
363 : affecting legacy, merkle, chained, or resigned status. For example,
364 : fd_shred_swap_type( chained resigned data ) == chained resigned code.
365 : fd_shred_swap_type( merkle code ) == merkle data. */
366 : FD_FN_CONST static inline uchar
367 7560 : fd_shred_swap_type( ulong type ) {
368 : /* Swap bits 4 and 5. Swap bits 6 and 7. */
369 7560 : return (uchar)(((type & 0x50UL)<<1) | ((type&0xA0UL)>>1));
370 7560 : }
371 :
372 : /* fd_shred_payload_sz: Returns the payload size of a shred.
373 : Undefined behavior if the shred has not passed `fd_shred_parse`. */
374 : FD_FN_PURE static inline ulong
375 390 : fd_shred_payload_sz( fd_shred_t const * shred ) {
376 390 : ulong type = fd_shred_type( shred->variant );
377 390 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_DATA ) ) {
378 243 : return shred->data.size - FD_SHRED_DATA_HEADER_SZ;
379 243 : } else {
380 147 : return fd_shred_sz( shred ) - FD_SHRED_CODE_HEADER_SZ
381 147 : - fd_shred_merkle_sz( shred->variant )
382 147 : - fd_ulong_if( fd_shred_is_chained( type ), FD_SHRED_MERKLE_ROOT_SZ, 0 )
383 147 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
384 147 : }
385 390 : }
386 :
387 : /* fd_shred_merkle_off: Returns the byte offset of the merkle inclusion proof of a shred.
388 :
389 : The provided shred must have passed validation in fd_shred_parse(). */
390 : FD_FN_PURE static inline ulong
391 12016575 : fd_shred_merkle_off( fd_shred_t const * shred ) {
392 12016575 : ulong type = fd_shred_type( shred->variant );
393 12016575 : return fd_shred_sz( shred )
394 12016575 : - fd_shred_merkle_sz( shred->variant )
395 12016575 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
396 12016575 : }
397 :
398 : /* fd_shred_merkle_nodes: Returns a pointer to the shred's merkle proof data.
399 :
400 : The provided shred must have passed validation in fd_shred_parse(). */
401 : FD_FN_PURE static inline fd_shred_merkle_t const *
402 13599 : fd_shred_merkle_nodes( fd_shred_t const * shred ) {
403 13599 : uchar const * ptr = (uchar const *)shred;
404 13599 : ptr += fd_shred_merkle_off( shred );
405 13599 : return (fd_shred_merkle_t const *)ptr;
406 13599 : }
407 :
408 : /* fd_shred_merkle_root: Assuming that `shred` is a Merkle variant,
409 : reconstructs the merkle root from a shred and populates it in
410 : root_out. Returns 1 on success, 0 on failure. The output value must
411 : be ignored if a failure is returned. U.B. if the shred is not a
412 : merkle variant. */
413 : int
414 : fd_shred_merkle_root( fd_shred_t const * shred, void * bmtree_mem, fd_bmtree_node_t * root_out );
415 :
416 : /* fd_shred_data_payload: Returns a pointer to a data shred payload.
417 :
418 : The provided shred must have passed validation in fd_shred_parse(),
419 : and must satisfy `type&FD_SHRED_TYPEMASK_DATA`
420 : where `uchar type = fd_shred_type( shred->variant )`. */
421 : FD_FN_CONST static inline uchar const *
422 57 : fd_shred_data_payload( fd_shred_t const * shred ) {
423 57 : return (uchar const *)shred + FD_SHRED_DATA_HEADER_SZ;
424 57 : }
425 :
426 : /* fd_shred_code_payload: Returns a pointer to a coding shred payload.
427 :
428 : The provided shred must have passed validation in fd_shred_parse(),
429 : and must satisfy `type&FD_SHRED_TYPEMASK_CODE`
430 : where `uchar type = fd_shred_type( shred->variant )`. */
431 : FD_FN_CONST static inline uchar const *
432 0 : fd_shred_code_payload( fd_shred_t const * shred ) {
433 0 : return (uchar const *)shred + FD_SHRED_CODE_HEADER_SZ;
434 0 : }
435 :
436 : /* fd_shred_chain_offset: Assuming that `shred` is a chained Merkle
437 : variant, compute the offset from the start of the shred to the start
438 : of the chained Merkle root. U.B. if the shred is not a chained
439 : variant. */
440 : FD_FN_CONST static inline ulong
441 12030789 : fd_shred_chain_off( uchar variant ) {
442 12030789 : ulong type = fd_shred_type( variant );
443 12030789 : return fd_ulong_if( type & FD_SHRED_TYPEMASK_CODE, FD_SHRED_MAX_SZ, FD_SHRED_MIN_SZ )
444 12030789 : - FD_SHRED_MERKLE_ROOT_SZ
445 12030789 : - fd_shred_merkle_sz( variant )
446 12030789 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
447 12030789 : }
448 :
449 : /* fd_shred_retrasmitter_sig_off: Assuming that `shred` is a resigned
450 : variant, compute the offset from the start of the shred to the start
451 : of the retransmitter signature. U.B if the shred is not a resigned
452 : chained type. */
453 : FD_FN_PURE static inline ulong
454 2745795 : fd_shred_retransmitter_sig_off( fd_shred_t const * shred ) {
455 2745795 : return fd_shred_sz( shred )-FD_SHRED_SIGNATURE_SZ;
456 2745795 : }
457 :
458 : FD_PROTOTYPES_END
459 :
460 : #endif /* HEADER_fd_src_ballet_shred_fd_shred_h */
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