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 0 : #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 0 : #define FD_SHRED_MIN_SZ (1203UL)
89 : /* FD_SHRED_DATA_HEADER_SZ: size of all headers for data type shreds. */
90 0 : #define FD_SHRED_DATA_HEADER_SZ (0x58UL)
91 : /* FD_SHRED_CODE_HEADER_SZ: size of all headers for coding type shreds. */
92 0 : #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 0 : #define FD_SHRED_TYPE_LEGACY_DATA ((uchar)0xA0)
107 : /* FD_SHRED_TYPE_LEGACY_CODE: A shred carrying Reed-Solomon ECC. */
108 0 : #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 0 : #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 0 : #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 0 : #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 0 : #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 0 : #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 0 : #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 0 : #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 0 : #define FD_SHRED_MERKLE_ROOT_SZ (32UL)
130 : /* FD_SHRED_MERKLE_NODE_SZ: the size of a merkle inclusion proof node in bytes. */
131 0 : #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 0 : #define FD_SHRED_MERKLE_LAYER_CNT (7UL)
134 : /* FD_SHRED_SIGNATURE_SZ: the size of a signature in a shred. */
135 0 : #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 0 : #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 0 : #define FD_SHRED_EBATCH 0x4000 /* End of batch reached (success)
172 : no more shreds and found FD_SHRED_DATA_FLAG_DATA_COMPLETE */
173 0 : #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 0 : #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
263 : bytes. Allows trailing data.
264 :
265 : The returned pointer either equals the input pointer or is NULL if
266 : the given shred is malformed or violates any invariants described
267 : above. */
268 : FD_FN_PURE fd_shred_t const *
269 : fd_shred_parse( uchar const * buf,
270 : ulong sz );
271 :
272 : /* fd_shred_type: Returns the value of the shred's type field. (FD_SHRED_TYPE_*) */
273 : FD_FN_CONST static inline uchar
274 0 : fd_shred_type( uchar variant ) {
275 0 : return variant & 0xf0;
276 0 : }
277 :
278 : /* fd_shred_variant: Returns the encoded variant field
279 : given the shred type and merkle proof length. */
280 : FD_FN_CONST static inline uchar
281 : fd_shred_variant( uchar type,
282 0 : uchar merkle_cnt ) {
283 0 : if( FD_LIKELY( type==FD_SHRED_TYPE_LEGACY_DATA ) )
284 0 : merkle_cnt = 0x05;
285 0 : if( FD_LIKELY( type==FD_SHRED_TYPE_LEGACY_CODE ) )
286 0 : merkle_cnt = 0x0a;
287 0 : return (uchar)(type | merkle_cnt);
288 0 : }
289 :
290 : FD_FN_PURE static inline ulong
291 0 : fd_shred_sz( fd_shred_t const * shred ) {
292 0 : uchar type = fd_shred_type( shred->variant );
293 0 : return fd_ulong_if(
294 0 : type & FD_SHRED_TYPEMASK_CODE,
295 0 : FD_SHRED_MAX_SZ,
296 0 : fd_ulong_if( type==FD_SHRED_TYPE_LEGACY_DATA, shred->data.size, FD_SHRED_MIN_SZ)
297 0 : ); /* Legacy data */
298 0 : }
299 :
300 : /* fd_shred_header_sz: Returns the header size of a shred.
301 : Returns zero if the shred has an invalid variant.
302 :
303 : Accesses offsets up to FD_SHRED_HEADER_MIN_SZ. */
304 : FD_FN_CONST static inline ulong
305 0 : fd_shred_header_sz( uchar variant ) {
306 0 : uchar type = fd_shred_type( variant );
307 0 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_DATA ) )
308 0 : return FD_SHRED_DATA_HEADER_SZ;
309 0 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_CODE ) )
310 0 : return FD_SHRED_CODE_HEADER_SZ;
311 0 : return 0;
312 0 : }
313 :
314 : /* fd_shred_merkle_cnt: Returns number of nodes in the merkle inclusion
315 : proof. Note that this excludes the root. Returns zero if the given
316 : shred is not a merkle variant. */
317 : FD_FN_CONST static inline uint
318 0 : fd_shred_merkle_cnt( uchar variant ) {
319 0 : uchar type = fd_shred_type( variant );
320 0 : if( FD_UNLIKELY( ( type == FD_SHRED_TYPE_LEGACY_DATA ) | ( type == FD_SHRED_TYPE_LEGACY_CODE ) ) )
321 0 : return 0;
322 0 : return (variant&0xfU);
323 0 : }
324 :
325 : /* fd_shred_merkle_sz: Returns the size in bytes of the merkle inclusion proof.
326 : Returns zero if the given shred is not a merkle variant. */
327 : FD_FN_CONST static inline ulong
328 0 : fd_shred_merkle_sz( uchar variant ) {
329 0 : return fd_shred_merkle_cnt( variant ) * FD_SHRED_MERKLE_NODE_SZ;
330 0 : }
331 :
332 :
333 : /* fd_shred_is_chained: Returns true if the shred is a chained merkle data or code shred. */
334 : FD_FN_CONST static inline uchar
335 0 : fd_shred_is_chained( ulong type ) {
336 0 : return (uchar)(
337 0 : ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED )
338 0 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED )
339 0 : | ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED )
340 0 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED ) );
341 0 : }
342 :
343 : /* fd_shred_is_resigned: Returns true if the shred is resigned by the retransmitter */
344 : FD_FN_CONST static inline uchar
345 0 : fd_shred_is_resigned( ulong type ) {
346 0 : return ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED )
347 0 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED );
348 0 : }
349 :
350 : /* fd_shred_is_{data,code} return 1 if the provided shred type is one of
351 : the data (or code, respectively) types, and 0 if not. The value
352 : provided for type must be a valid shred type (one of the
353 : FD_SHRED_TYPE_* values). For the purposes of these functions,
354 : properties beyond data/code are ignored; e.g. a chained resigned
355 : Merkle data shred is considered a data shred. */
356 0 : FD_FN_CONST static inline uchar fd_shred_is_data( ulong type ) { return (type & 0xC0UL)==0x80UL; }
357 0 : FD_FN_CONST static inline uchar fd_shred_is_code( ulong type ) { return (type & 0xC0UL)==0x40UL; }
358 :
359 : /* fd_shred_swap_type: changes data into code or vice versa without
360 : affecting legacy, merkle, chained, or resigned status. For example,
361 : fd_shred_swap_type( chained resigned data ) == chained resigned code.
362 : fd_shred_swap_type( merkle code ) == merkle data. */
363 : FD_FN_CONST static inline uchar
364 0 : fd_shred_swap_type( ulong type ) {
365 : /* Swap bits 4 and 5. Swap bits 6 and 7. */
366 0 : return (uchar)(((type & 0x50UL)<<1) | ((type&0xA0UL)>>1));
367 0 : }
368 :
369 : /* fd_shred_payload_sz: Returns the payload size of a shred.
370 : Undefined behavior if the shred has not passed `fd_shred_parse`. */
371 : FD_FN_PURE static inline ulong
372 0 : fd_shred_payload_sz( fd_shred_t const * shred ) {
373 0 : ulong type = fd_shred_type( shred->variant );
374 0 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_DATA ) ) {
375 0 : return shred->data.size - FD_SHRED_DATA_HEADER_SZ;
376 0 : } else {
377 0 : return fd_shred_sz( shred ) - FD_SHRED_CODE_HEADER_SZ
378 0 : - fd_shred_merkle_sz( shred->variant )
379 0 : - fd_ulong_if( fd_shred_is_chained( type ), FD_SHRED_MERKLE_ROOT_SZ, 0 )
380 0 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
381 0 : }
382 0 : }
383 :
384 : /* fd_shred_merkle_off: Returns the byte offset of the merkle inclusion proof of a shred.
385 :
386 : The provided shred must have passed validation in fd_shred_parse(). */
387 : FD_FN_PURE static inline ulong
388 0 : fd_shred_merkle_off( fd_shred_t const * shred ) {
389 0 : ulong type = fd_shred_type( shred->variant );
390 0 : return fd_shred_sz( shred )
391 0 : - fd_shred_merkle_sz( shred->variant )
392 0 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
393 0 : }
394 :
395 : /* fd_shred_merkle_nodes: Returns a pointer to the shred's merkle proof data.
396 :
397 : The provided shred must have passed validation in fd_shred_parse(). */
398 : FD_FN_PURE static inline fd_shred_merkle_t const *
399 0 : fd_shred_merkle_nodes( fd_shred_t const * shred ) {
400 0 : uchar const * ptr = (uchar const *)shred;
401 0 : ptr += fd_shred_merkle_off( shred );
402 0 : return (fd_shred_merkle_t const *)ptr;
403 0 : }
404 :
405 : /* fd_shred_merkle_root: Assuming that `shred` is a Merkle variant,
406 : reconstructs the merkle root from a shred and populates it in
407 : root_out. Returns 1 on success, 0 on failure. The output value must
408 : be ignored if a failure is returned. U.B. if the shred is not a
409 : merkle variant. */
410 : FD_FN_PURE int
411 : fd_shred_merkle_root( fd_shred_t const * shred, void * bmtree_mem, fd_bmtree_node_t * root_out );
412 :
413 : /* fd_shred_data_payload: Returns a pointer to a data shred payload.
414 :
415 : The provided shred must have passed validation in fd_shred_parse(),
416 : and must satisfy `type&FD_SHRED_TYPEMASK_DATA`
417 : where `uchar type = fd_shred_type( shred->variant )`. */
418 : FD_FN_CONST static inline uchar const *
419 0 : fd_shred_data_payload( fd_shred_t const * shred ) {
420 0 : return (uchar const *)shred + FD_SHRED_DATA_HEADER_SZ;
421 0 : }
422 :
423 : /* fd_shred_code_payload: Returns a pointer to a coding shred payload.
424 :
425 : The provided shred must have passed validation in fd_shred_parse(),
426 : and must satisfy `type&FD_SHRED_TYPEMASK_CODE`
427 : where `uchar type = fd_shred_type( shred->variant )`. */
428 : FD_FN_CONST static inline uchar const *
429 0 : fd_shred_code_payload( fd_shred_t const * shred ) {
430 0 : return (uchar const *)shred + FD_SHRED_CODE_HEADER_SZ;
431 0 : }
432 :
433 : /* fd_shred_chain_offset: Assuming that `shred` is a chained Merkle
434 : variant, compute the offset from the start of the shred to the start
435 : of the chained Merkle root. U.B. if the shred is not a chained
436 : variant. */
437 : FD_FN_CONST static inline ulong
438 0 : fd_shred_chain_off( uchar variant ) {
439 0 : ulong type = fd_shred_type( variant );
440 0 : return fd_ulong_if( type & FD_SHRED_TYPEMASK_CODE, FD_SHRED_MAX_SZ, FD_SHRED_MIN_SZ )
441 0 : - FD_SHRED_MERKLE_ROOT_SZ
442 0 : - fd_shred_merkle_sz( variant )
443 0 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
444 0 : }
445 :
446 : /* fd_shred_retrasmitter_sig_off: Assuming that `shred` is a resigned
447 : variant, compute the offset from the start of the shred to the start
448 : of the retransmitter signature. U.B if the shred is not a resigned
449 : chained type. */
450 : FD_FN_PURE static inline ulong
451 0 : fd_shred_retransmitter_sig_off( fd_shred_t const * shred ) {
452 0 : return fd_shred_sz( shred )-FD_SHRED_SIGNATURE_SZ;
453 0 : }
454 :
455 : FD_PROTOTYPES_END
456 :
457 : #endif /* HEADER_fd_src_ballet_shred_fd_shred_h */
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