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 208698876 : #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 208697055 : #define FD_SHRED_MIN_SZ (1203UL)
89 : /* FD_SHRED_DATA_HEADER_SZ: size of all headers for data type shreds. */
90 104868468 : #define FD_SHRED_DATA_HEADER_SZ (0x58UL)
91 : /* FD_SHRED_CODE_HEADER_SZ: size of all headers for coding type shreds. */
92 55720803 : #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 140954193 : #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 1631202 : #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 210678468 : #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 40251711 : #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 40250844 : #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 271976766 : #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 271975131 : #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 208655073 : #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 136389783 : #define FD_SHRED_MERKLE_ROOT_SZ (32UL)
130 : /* FD_SHRED_MERKLE_NODE_SZ: the size of a merkle inclusion proof node in bytes. */
131 175169877 : #define FD_SHRED_MERKLE_NODE_SZ (20UL)
132 : /* FD_SHRED_MERKLE_LAYER_CNT: the count of inclusion proof layers in the binary merkle tree. */
133 537 : #define FD_SHRED_MERKLE_LAYER_CNT (10UL)
134 : /* FD_SHRED_SIGNATURE_SZ: the size of a signature in a shred. */
135 211549959 : #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 0 : #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 3 : #define FD_SHRED_BLK_MAX (1 << 15UL) /* 32,768 shreds */
153 : #define FD_SHRED_IDX_MAX (FD_SHRED_BLK_MAX - 1)
154 :
155 : /* Many static bounds are specified around the assumption that this is a
156 : protocol limit on the max number of shreds in a slot. If this limit
157 : changes, all the relevant usages in other areas of the Firedancer
158 : codebase should be updated before modifying this assertion. */
159 :
160 : FD_STATIC_ASSERT( FD_SHRED_BLK_MAX == 32768, check all usages before changing this limit! );
161 :
162 : /* 36,536,320 bytes per slot */
163 : #define FD_SHRED_DATA_PAYLOAD_MAX_PER_SLOT (FD_SHRED_DATA_PAYLOAD_MAX * FD_SHRED_BLK_MAX)
164 :
165 : /* Offset of the shred variant. Used for parsing. */
166 : #define FD_SHRED_VARIANT_OFF 0x40
167 :
168 : /* Firedancer-specific internal error codes.
169 :
170 : These are not part of the Solana protocol. */
171 :
172 0 : #define FD_SHRED_EBATCH 0x4000 /* End of batch reached (success)
173 : no more shreds and found FD_SHRED_DATA_FLAG_DATA_COMPLETE */
174 0 : #define FD_SHRED_ESLOT 0x8000 /* End of slot reached (success)
175 : no more shreds and found FD_SHRED_DATA_FLAG_SLOT_COMPLETE */
176 0 : #define FD_SHRED_ENOMEM 12 /* Error: Target buffer too small */
177 0 : #define FD_SHRED_EINVAL 22 /* Error: Invalid shred data */
178 0 : #define FD_SHRED_EPIPE 32 /* Error: Expected data in source buffer, got EOF */
179 :
180 : /* Primary shred data structure.
181 : Relies heavily on packed fields and unaligned memory accesses. */
182 : struct __attribute__((packed)) fd_shred {
183 : /* Ed25519 signature over the shred
184 :
185 : For legacy type shreds, signs over content of the shred structure past this signature field.
186 : For merkle type shreds, signs over the first node of the inclusion proof (merkle root). */
187 : /* 0x00 */ fd_ed25519_sig_t signature;
188 :
189 : /* Shred variant specifier
190 : Consists of two four bit fields. (Deliberately not using bit fields here)
191 :
192 : The high four bits indicate the shred type:
193 : - 0101: legacy code
194 : - 1010: legacy data
195 : - 0100: merkle code
196 : - 0110: merkle code (chained)
197 : - 0111: merkle code (chained resigned)
198 : - 1000: merkle data
199 : - 1001: merkle data (chained)
200 : - 1011: merkle data (chained resigned)
201 :
202 : For legacy type shreds, the low four bits are set to static patterns.
203 : For merkle type shreds, the low four bits are set to the number of non-root nodes in the inclusion proof.
204 : For merkle code type shreds, the 3rd highest bit represents if the merkle tree is chained.
205 : For merkle data type shreds, the 4th highest bit represents if the merkle tree is chained.
206 : For merkle code type shreds, the 4th highest bit represents if the shred is resigned.
207 : For merkle data type shreds, the 3th highest bit represents if the shred is resigned.
208 : */
209 : /* 0x40 */ uchar variant;
210 :
211 : /* Slot number that this shred is part of */
212 : /* 0x41 */ ulong slot;
213 :
214 : /* Index of this shred within the slot */
215 : /* 0x49 */ uint idx;
216 :
217 : /* Hash of the genesis version and historical hard forks of the current chain */
218 : /* 0x4d */ ushort version;
219 :
220 : /* Index into the vector of FEC sets for this slot. For data shreds, fec_set_idx<=idx. */
221 : /* 0x4f */ uint fec_set_idx;
222 :
223 : union {
224 : /* Common data shred header */
225 : struct __attribute__((packed)) {
226 : /* Slot number difference between this block and the parent block.
227 : parent_off <= slot.
228 : Always greater than zero, except for slot 0, in which case the
229 : previous invariant forces this to be 0. */
230 : /* 0x53 */ ushort parent_off;
231 :
232 : /* Bit field (MSB first)
233 : See FD_SHRED_DATA_FLAG_*
234 :
235 : [XX.. ....] Block complete? 0b00=no 0b01=no 0b11=yes (implies Entry batch complete)
236 : [.X.. ....] Entry batch complete? 0b0=no 0b1=yes
237 : [..XX XXXX] Reference tick number */
238 : /* 0x55 */ uchar flags;
239 :
240 : /* Shred size: size of data shred headers (88 bytes) + payload length */
241 : /* 0x56 */ ushort size;
242 : } data;
243 :
244 : /* Common coding shred header */
245 : struct __attribute__((packed)) {
246 : /* Total number of data shreds in FEC set. Must be positive <= FD_REEDSOL_DATA_SHREDS_MAX. */
247 : /* 0x53 */ ushort data_cnt;
248 :
249 : /* Total number of coding shreds in FEC set. Must be positive <= FD_REEDSOL_CODE_SHREDS_MAX. */
250 : /* 0x55 */ ushort code_cnt;
251 :
252 : /* Index within the vector of coding shreds in FEC set. In [0,
253 : code_cnt). Also, shred.code.idx <= shred.idx. */
254 : /* 0x57 */ ushort idx;
255 : } code;
256 : };
257 : };
258 : typedef struct fd_shred fd_shred_t;
259 :
260 : FD_PROTOTYPES_BEGIN
261 :
262 : /* fd_shred_parse: Parses and validates an untrusted shred stored in
263 : bytes buf[i] for i in [0, sz). sz must be at least FD_SHRED_MIN_SZ
264 : bytes. Allows trailing data.
265 :
266 : The returned pointer either equals the input pointer or is NULL if
267 : the given shred is malformed or violates any invariants described
268 : above. */
269 : FD_FN_PURE fd_shred_t const *
270 : fd_shred_parse( uchar const * buf,
271 : ulong sz );
272 :
273 : /* fd_shred_type: Returns the value of the shred's type field. (FD_SHRED_TYPE_*) */
274 : FD_FN_CONST static inline uchar
275 493021494 : fd_shred_type( uchar variant ) {
276 493021494 : return variant & 0xf0;
277 493021494 : }
278 :
279 : /* fd_shred_variant: Returns the encoded variant field
280 : given the shred type and merkle proof length. */
281 : FD_FN_CONST static inline uchar
282 : fd_shred_variant( uchar type,
283 106355193 : uchar merkle_cnt ) {
284 106355193 : if( FD_LIKELY( type==FD_SHRED_TYPE_LEGACY_DATA ) )
285 3 : merkle_cnt = 0x05;
286 106355193 : if( FD_LIKELY( type==FD_SHRED_TYPE_LEGACY_CODE ) )
287 3 : merkle_cnt = 0x0a;
288 106355193 : return (uchar)(type | merkle_cnt);
289 106355193 : }
290 :
291 : FD_FN_PURE static inline ulong
292 140937972 : fd_shred_sz( fd_shred_t const * shred ) {
293 140937972 : uchar type = fd_shred_type( shred->variant );
294 140937972 : return fd_ulong_if(
295 140937972 : type & FD_SHRED_TYPEMASK_CODE,
296 140937972 : FD_SHRED_MAX_SZ,
297 140937972 : fd_ulong_if( type==FD_SHRED_TYPE_LEGACY_DATA, shred->data.size, FD_SHRED_MIN_SZ)
298 140937972 : ); /* Legacy data */
299 140937972 : }
300 :
301 : /* fd_shred_header_sz: Returns the header size of a shred.
302 : Returns zero if the shred has an invalid variant.
303 :
304 : Accesses offsets up to FD_SHRED_HEADER_MIN_SZ. */
305 : FD_FN_CONST static inline ulong
306 33564 : fd_shred_header_sz( uchar variant ) {
307 33564 : uchar type = fd_shred_type( variant );
308 33564 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_DATA ) )
309 16368 : return FD_SHRED_DATA_HEADER_SZ;
310 17196 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_CODE ) )
311 17196 : return FD_SHRED_CODE_HEADER_SZ;
312 0 : return 0;
313 17196 : }
314 :
315 : /* fd_shred_merkle_cnt: Returns number of nodes in the merkle inclusion
316 : proof. Note that this excludes the root. Returns zero if the given
317 : shred is not a merkle variant. */
318 : FD_FN_CONST static inline uint
319 173756643 : fd_shred_merkle_cnt( uchar variant ) {
320 173756643 : uchar type = fd_shred_type( variant );
321 173756643 : if( FD_UNLIKELY( ( type == FD_SHRED_TYPE_LEGACY_DATA ) | ( type == FD_SHRED_TYPE_LEGACY_CODE ) ) )
322 45 : return 0;
323 173756598 : return (variant&0xfU);
324 173756643 : }
325 :
326 : /* fd_shred_merkle_sz: Returns the size in bytes of the merkle inclusion proof.
327 : Returns zero if the given shred is not a merkle variant. */
328 : FD_FN_CONST static inline ulong
329 173729364 : fd_shred_merkle_sz( uchar variant ) {
330 173729364 : return fd_shred_merkle_cnt( variant ) * FD_SHRED_MERKLE_NODE_SZ;
331 173729364 : }
332 :
333 :
334 : /* fd_shred_is_chained: Returns true if the shred is a chained merkle data or code shred. */
335 : FD_FN_CONST static inline uchar
336 38816673 : fd_shred_is_chained( ulong type ) {
337 38816673 : return (uchar)(
338 38816673 : ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED )
339 38816673 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED )
340 38816673 : | ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED )
341 38816673 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED ) );
342 38816673 : }
343 :
344 : /* fd_shred_is_resigned: Returns true if the shred is resigned by the retransmitter */
345 : FD_FN_CONST static inline uchar
346 231725967 : fd_shred_is_resigned( ulong type ) {
347 231725967 : return ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED )
348 231725967 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED );
349 231725967 : }
350 :
351 : /* fd_shred_is_{data,code} return 1 if the provided shred type is one of
352 : the data (or code, respectively) types, and 0 if not. The value
353 : provided for type must be a valid shred type (one of the
354 : FD_SHRED_TYPE_* values). For the purposes of these functions,
355 : properties beyond data/code are ignored; e.g. a chained resigned
356 : Merkle data shred is considered a data shred. */
357 4516263 : FD_FN_CONST static inline uchar fd_shred_is_data( ulong type ) { return (type & 0xC0UL)==0x80UL; }
358 294 : FD_FN_CONST static inline uchar fd_shred_is_code( ulong type ) { return (type & 0xC0UL)==0x40UL; }
359 :
360 : /* fd_shred_swap_type: changes data into code or vice versa without
361 : affecting leagacy, merkle, chained, or resigned status. For example,
362 : fd_shred_swap_type( chained resigned data ) == chained resigned code.
363 : fd_shred_swap_type( merkle code ) == merkle data. */
364 : FD_FN_CONST static inline uchar
365 9384 : fd_shred_swap_type( ulong type ) {
366 : /* Swap bits 4 and 5. Swap bits 6 and 7. */
367 9384 : return (uchar)(((type & 0x50UL)<<1) | ((type&0xA0UL)>>1));
368 9384 : }
369 :
370 : /* fd_shred_payload_sz: Returns the payload size of a shred.
371 : Undefined behavior if the shred has not passed `fd_shred_parse`. */
372 : FD_FN_PURE static inline ulong
373 294 : fd_shred_payload_sz( fd_shred_t const * shred ) {
374 294 : ulong type = fd_shred_type( shred->variant );
375 294 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_DATA ) ) {
376 147 : return shred->data.size - FD_SHRED_DATA_HEADER_SZ;
377 147 : } else {
378 147 : return fd_shred_sz( shred ) - FD_SHRED_CODE_HEADER_SZ
379 147 : - fd_shred_merkle_sz( shred->variant )
380 147 : - fd_ulong_if( fd_shred_is_chained( type ), FD_SHRED_MERKLE_ROOT_SZ, 0 )
381 147 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
382 147 : }
383 294 : }
384 :
385 : /* fd_shred_merkle_off: Returns the byte offset of the merkle inclusion proof of a shred.
386 :
387 : The provided shred must have passed validation in fd_shred_parse(). */
388 : FD_FN_PURE static inline ulong
389 105978552 : fd_shred_merkle_off( fd_shred_t const * shred ) {
390 105978552 : ulong type = fd_shred_type( shred->variant );
391 105978552 : return fd_shred_sz( shred )
392 105978552 : - fd_shred_merkle_sz( shred->variant )
393 105978552 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
394 105978552 : }
395 :
396 : /* fd_shred_merkle_nodes: Returns a pointer to the shred's merkle proof data.
397 :
398 : The provided shred must have passed validation in fd_shred_parse(). */
399 : FD_FN_PURE static inline fd_shred_merkle_t const *
400 9030 : fd_shred_merkle_nodes( fd_shred_t const * shred ) {
401 9030 : uchar const * ptr = (uchar const *)shred;
402 9030 : ptr += fd_shred_merkle_off( shred );
403 9030 : return (fd_shred_merkle_t const *)ptr;
404 9030 : }
405 :
406 : /* fd_shred_merkle_root: Assuming that `shred` is a Merkle variant,
407 : reconstructs the merkle root from a shred and populates it in
408 : root_out. Returns 1 on success, 0 on failure. The output value must
409 : be ignored if a failure is returned. U.B. if the shred is not a
410 : merkle variant. */
411 : FD_FN_PURE int
412 : fd_shred_merkle_root( fd_shred_t const * shred, void * bmtree_mem, fd_bmtree_node_t * root_out );
413 :
414 : /* fd_shred_data_payload: Returns a pointer to a data shred payload.
415 :
416 : The provided shred must have passed validation in fd_shred_parse(),
417 : and must satisfy `type&FD_SHRED_TYPEMASK_DATA`
418 : where `uchar type = fd_shred_type( shred->variant )`. */
419 : FD_FN_CONST static inline uchar const *
420 9 : fd_shred_data_payload( fd_shred_t const * shred ) {
421 9 : return (uchar const *)shred + FD_SHRED_DATA_HEADER_SZ;
422 9 : }
423 :
424 : /* fd_shred_code_payload: Returns a pointer to a coding shred payload.
425 :
426 : The provided shred must have passed validation in fd_shred_parse(),
427 : and must satisfy `type&FD_SHRED_TYPEMASK_CODE`
428 : where `uchar type = fd_shred_type( shred->variant )`. */
429 : FD_FN_CONST static inline uchar const *
430 0 : fd_shred_code_payload( fd_shred_t const * shred ) {
431 0 : return (uchar const *)shred + FD_SHRED_CODE_HEADER_SZ;
432 0 : }
433 :
434 : /* fd_shred_chain_offset: Assuming that `shred` is a chained Merkle
435 : variant, compute the offset from the start of the shred to the start
436 : of the chained Merkle root. U.B. if the shred is not a chained
437 : variant. */
438 : FD_FN_CONST static inline ulong
439 67717101 : fd_shred_chain_off( uchar variant ) {
440 67717101 : ulong type = fd_shred_type( variant );
441 67717101 : return fd_ulong_if( type & FD_SHRED_TYPEMASK_CODE, FD_SHRED_MAX_SZ, FD_SHRED_MIN_SZ )
442 67717101 : - FD_SHRED_MERKLE_ROOT_SZ
443 67717101 : - fd_shred_merkle_sz( variant )
444 67717101 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
445 67717101 : }
446 :
447 : /* fd_shred_retrasmitter_sig_off: Assuming that `shred` is a resigned
448 : variant, compute the offset from the start of the shred to the start
449 : of the retransmitter signature. U.B if the shred is not a resigned
450 : chained type. */
451 : FD_FN_PURE static inline ulong
452 34941159 : fd_shred_retransmitter_sig_off( fd_shred_t const * shred ) {
453 34941159 : return fd_shred_sz( shred )-FD_SHRED_SIGNATURE_SZ;
454 34941159 : }
455 :
456 : FD_PROTOTYPES_END
457 :
458 : #endif /* HEADER_fd_src_ballet_shred_fd_shred_h */
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