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 : Consequentially, 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 208698579 : #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 208696650 : #define FD_SHRED_MIN_SZ (1203UL)
89 : /* FD_SHRED_DATA_HEADER_SZ: size of all headers for data type shreds. */
90 104868267 : #define FD_SHRED_DATA_HEADER_SZ (0x58UL)
91 : /* FD_SHRED_CODE_HEADER_SZ: size of all headers for coding type shreds. */
92 55720704 : #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 0 : #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 140953794 : #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 210678171 : #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 40251312 : #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 40250445 : #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 271975962 : #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 271974327 : #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 208654776 : #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 136389294 : #define FD_SHRED_MERKLE_ROOT_SZ (32UL)
130 : /* FD_SHRED_MERKLE_NODE_SZ: the size of a merkle inclusion proof node in bytes. */
131 175169571 : #define FD_SHRED_MERKLE_NODE_SZ (20UL)
132 : /* FD_SHRED_MERKLE_LAYER_CNT: the count of inclusion proof layers in the binary merkle tree. */
133 531 : #define FD_SHRED_MERKLE_LAYER_CNT (10UL)
134 : /* FD_SHRED_SIGNATURE_SZ: the size of a signature in a shred. */
135 211549560 : #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 : #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 : /* Many static bounds are specified around the assumption that this is a
163 : protocol limit on the max number of shreds in a slot. If this limit
164 : changes, all the relevant usages in other areas of the Firedancer
165 : codebase should be updated before modifying this assertion. */
166 :
167 : FD_STATIC_ASSERT( FD_SHRED_BLK_MAX == 32768, check all usages before changing this limit! );
168 :
169 : /* 36,536,320 bytes per slot */
170 0 : #define FD_SHRED_DATA_PAYLOAD_MAX_PER_SLOT (FD_SHRED_DATA_PAYLOAD_MAX * FD_SHRED_BLK_MAX)
171 :
172 : /* Offset of the shred variant. Used for parsing. */
173 : #define FD_SHRED_VARIANT_OFF 0x40
174 :
175 : /* Firedancer-specific internal error codes.
176 :
177 : These are not part of the Solana protocol. */
178 :
179 0 : #define FD_SHRED_EBATCH 0x4000 /* End of batch reached (success)
180 : no more shreds and found FD_SHRED_DATA_FLAG_DATA_COMPLETE */
181 0 : #define FD_SHRED_ESLOT 0x8000 /* End of slot reached (success)
182 : no more shreds and found FD_SHRED_DATA_FLAG_SLOT_COMPLETE */
183 0 : #define FD_SHRED_ENOMEM 12 /* Error: Target buffer too small */
184 0 : #define FD_SHRED_EINVAL 22 /* Error: Invalid shred data */
185 0 : #define FD_SHRED_EPIPE 32 /* Error: Expected data in source buffer, got EOF */
186 :
187 : /* Primary shred data structure.
188 : Relies heavily on packed fields and unaligned memory accesses. */
189 : struct __attribute__((packed)) fd_shred {
190 : /* Ed25519 signature over the shred
191 :
192 : For legacy type shreds, signs over content of the shred structure past this signature field.
193 : For merkle type shreds, signs over the first node of the inclusion proof (merkle root). */
194 : /* 0x00 */ fd_ed25519_sig_t signature;
195 :
196 : /* Shred variant specifier
197 : Consists of two four bit fields. (Deliberately not using bit fields here)
198 :
199 : The high four bits indicate the shred type:
200 : - 0101: legacy code
201 : - 1010: legacy data
202 : - 0100: merkle code
203 : - 0110: merkle code (chained)
204 : - 0111: merkle code (chained resigned)
205 : - 1000: merkle data
206 : - 1001: merkle data (chained)
207 : - 1011: merkle data (chained resigned)
208 :
209 : For legacy type shreds, the low four bits are set to static patterns.
210 : For merkle type shreds, the low four bits are set to the number of non-root nodes in the inclusion proof.
211 : For merkle code type shreds, the 3rd highest bit represents if the merkle tree is chained.
212 : For merkle data type shreds, the 4th highest bit represents if the merkle tree is chained.
213 : For merkle code type shreds, the 4th highest bit represents if the shred is resigned.
214 : For merkle data type shreds, the 3th highest bit represents if the shred is resigned.
215 : */
216 : /* 0x40 */ uchar variant;
217 :
218 : /* Slot number that this shred is part of */
219 : /* 0x41 */ ulong slot;
220 :
221 : /* Index of this shred within the slot */
222 : /* 0x49 */ uint idx;
223 :
224 : /* Hash of the genesis version and historical hard forks of the current chain */
225 : /* 0x4d */ ushort version;
226 :
227 : /* Index into the vector of FEC sets for this slot. For data shreds, fec_set_idx<=idx. */
228 : /* 0x4f */ uint fec_set_idx;
229 :
230 : union {
231 : /* Common data shred header */
232 : struct __attribute__((packed)) {
233 : /* Slot number difference between this block and the parent block.
234 : parent_off <= slot.
235 : Always greater than zero, except for slot 0, in which case the
236 : previous invariant forces this to be 0. */
237 : /* 0x53 */ ushort parent_off;
238 :
239 : /* Bit field (MSB first)
240 : See FD_SHRED_DATA_FLAG_*
241 :
242 : [XX.. ....] Block complete? 0b00=no 0b01=no 0b11=yes (implies Entry batch complete)
243 : [.X.. ....] Entry batch complete? 0b0=no 0b1=yes
244 : [..XX XXXX] Reference tick number */
245 : /* 0x55 */ uchar flags;
246 :
247 : /* Shred size: size of data shred headers (88 bytes) + payload length */
248 : /* 0x56 */ ushort size;
249 : } data;
250 :
251 : /* Common coding shred header */
252 : struct __attribute__((packed)) {
253 : /* Total number of data shreds in FEC set. Must be positive <= FD_REEDSOL_DATA_SHREDS_MAX. */
254 : /* 0x53 */ ushort data_cnt;
255 :
256 : /* Total number of coding shreds in FEC set. Must be positive <= FD_REEDSOL_CODE_SHREDS_MAX. */
257 : /* 0x55 */ ushort code_cnt;
258 :
259 : /* Index within the vector of coding shreds in slot. In [0,
260 : code_cnt). Also, shred.code.idx <= shred.idx. */
261 : /* 0x57 */ ushort idx;
262 : } code;
263 : };
264 : };
265 : typedef struct fd_shred fd_shred_t;
266 :
267 : FD_PROTOTYPES_BEGIN
268 :
269 : /* fd_shred_parse: Parses and validates an untrusted shred stored in
270 : bytes buf[i] for i in [0, sz). sz must be at least FD_SHRED_MIN_SZ
271 : bytes. Allows trailing data.
272 :
273 : The returned pointer either equals the input pointer or is NULL if
274 : the given shred is malformed or violates any invariants described
275 : above. */
276 : FD_FN_PURE fd_shred_t const *
277 : fd_shred_parse( uchar const * buf,
278 : ulong sz );
279 :
280 : /* fd_shred_type: Returns the value of the shred's type field. (FD_SHRED_TYPE_*) */
281 : FD_FN_CONST static inline uchar
282 493020495 : fd_shred_type( uchar variant ) {
283 493020495 : return variant & 0xf0;
284 493020495 : }
285 :
286 : /* fd_shred_variant: Returns the encoded variant field
287 : given the shred type and merkle proof length. */
288 : FD_FN_CONST static inline uchar
289 : fd_shred_variant( uchar type,
290 106355181 : uchar merkle_cnt ) {
291 106355181 : if( FD_LIKELY( type==FD_SHRED_TYPE_LEGACY_DATA ) )
292 3 : merkle_cnt = 0x05;
293 106355181 : if( FD_LIKELY( type==FD_SHRED_TYPE_LEGACY_CODE ) )
294 3 : merkle_cnt = 0x0a;
295 106355181 : return (uchar)(type | merkle_cnt);
296 106355181 : }
297 :
298 : FD_FN_PURE static inline ulong
299 140937675 : fd_shred_sz( fd_shred_t const * shred ) {
300 140937675 : uchar type = fd_shred_type( shred->variant );
301 140937675 : return fd_ulong_if(
302 140937675 : type & FD_SHRED_TYPEMASK_CODE,
303 140937675 : FD_SHRED_MAX_SZ,
304 140937675 : fd_ulong_if( type==FD_SHRED_TYPE_LEGACY_DATA, shred->data.size, FD_SHRED_MIN_SZ)
305 140937675 : ); /* Legacy data */
306 140937675 : }
307 :
308 : /* fd_shred_header_sz: Returns the header size of a shred.
309 : Returns zero if the shred has an invalid variant.
310 :
311 : Accesses offsets up to FD_SHRED_HEADER_MIN_SZ. */
312 : FD_FN_CONST static inline ulong
313 33462 : fd_shred_header_sz( uchar variant ) {
314 33462 : uchar type = fd_shred_type( variant );
315 33462 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_DATA ) )
316 16266 : return FD_SHRED_DATA_HEADER_SZ;
317 17196 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_CODE ) )
318 17196 : return FD_SHRED_CODE_HEADER_SZ;
319 0 : return 0;
320 17196 : }
321 :
322 : /* fd_shred_merkle_cnt: Returns number of nodes in the merkle inclusion
323 : proof. Note that this excludes the root. Returns zero if the given
324 : shred is not a merkle variant. */
325 : FD_FN_CONST static inline uint
326 173756343 : fd_shred_merkle_cnt( uchar variant ) {
327 173756343 : uchar type = fd_shred_type( variant );
328 173756343 : if( FD_UNLIKELY( ( type == FD_SHRED_TYPE_LEGACY_DATA ) | ( type == FD_SHRED_TYPE_LEGACY_CODE ) ) )
329 45 : return 0;
330 173756298 : return (variant&0xfU);
331 173756343 : }
332 :
333 : /* fd_shred_merkle_sz: Returns the size in bytes of the merkle inclusion proof.
334 : Returns zero if the given shred is not a merkle variant. */
335 : FD_FN_CONST static inline ulong
336 173729163 : fd_shred_merkle_sz( uchar variant ) {
337 173729163 : return fd_shred_merkle_cnt( variant ) * FD_SHRED_MERKLE_NODE_SZ;
338 173729163 : }
339 :
340 :
341 : /* fd_shred_is_chained: Returns true if the shred is a chained merkle data or code shred. */
342 : FD_FN_CONST static inline uchar
343 38816274 : fd_shred_is_chained( ulong type ) {
344 38816274 : return (uchar)(
345 38816274 : ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED )
346 38816274 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED )
347 38816274 : | ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED )
348 38816274 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED ) );
349 38816274 : }
350 :
351 : /* fd_shred_is_resigned: Returns true if the shred is resigned by the retransmitter */
352 : FD_FN_CONST static inline uchar
353 231725562 : fd_shred_is_resigned( ulong type ) {
354 231725562 : return ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED )
355 231725562 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED );
356 231725562 : }
357 :
358 : /* fd_shred_is_{data,code} return 1 if the provided shred type is one of
359 : the data (or code, respectively) types, and 0 if not. The value
360 : provided for type must be a valid shred type (one of the
361 : FD_SHRED_TYPE_* values). For the purposes of these functions,
362 : properties beyond data/code are ignored; e.g. a chained resigned
363 : Merkle data shred is considered a data shred. */
364 4516164 : FD_FN_CONST static inline uchar fd_shred_is_data( ulong type ) { return (type & 0xC0UL)==0x80UL; }
365 294 : FD_FN_CONST static inline uchar fd_shred_is_code( ulong type ) { return (type & 0xC0UL)==0x40UL; }
366 :
367 : /* fd_shred_swap_type: changes data into code or vice versa without
368 : affecting leagacy, merkle, chained, or resigned status. For example,
369 : fd_shred_swap_type( chained resigned data ) == chained resigned code.
370 : fd_shred_swap_type( merkle code ) == merkle data. */
371 : FD_FN_CONST static inline uchar
372 9372 : fd_shred_swap_type( ulong type ) {
373 : /* Swap bits 4 and 5. Swap bits 6 and 7. */
374 9372 : return (uchar)(((type & 0x50UL)<<1) | ((type&0xA0UL)>>1));
375 9372 : }
376 :
377 : /* fd_shred_payload_sz: Returns the payload size of a shred.
378 : Undefined behavior if the shred has not passed `fd_shred_parse`. */
379 : FD_FN_PURE static inline ulong
380 294 : fd_shred_payload_sz( fd_shred_t const * shred ) {
381 294 : ulong type = fd_shred_type( shred->variant );
382 294 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_DATA ) ) {
383 147 : return shred->data.size - FD_SHRED_DATA_HEADER_SZ;
384 147 : } else {
385 147 : return fd_shred_sz( shred ) - FD_SHRED_CODE_HEADER_SZ
386 147 : - fd_shred_merkle_sz( shred->variant )
387 147 : - fd_ulong_if( fd_shred_is_chained( type ), FD_SHRED_MERKLE_ROOT_SZ, 0 )
388 147 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
389 147 : }
390 294 : }
391 :
392 : /* fd_shred_merkle_off: Returns the byte offset of the merkle inclusion proof of a shred.
393 :
394 : The provided shred must have passed validation in fd_shred_parse(). */
395 : FD_FN_PURE static inline ulong
396 105978453 : fd_shred_merkle_off( fd_shred_t const * shred ) {
397 105978453 : ulong type = fd_shred_type( shred->variant );
398 105978453 : return fd_shred_sz( shred )
399 105978453 : - fd_shred_merkle_sz( shred->variant )
400 105978453 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
401 105978453 : }
402 :
403 : /* fd_shred_merkle_nodes: Returns a pointer to the shred's merkle proof data.
404 :
405 : The provided shred must have passed validation in fd_shred_parse(). */
406 : FD_FN_PURE static inline fd_shred_merkle_t const *
407 8931 : fd_shred_merkle_nodes( fd_shred_t const * shred ) {
408 8931 : uchar const * ptr = (uchar const *)shred;
409 8931 : ptr += fd_shred_merkle_off( shred );
410 8931 : return (fd_shred_merkle_t const *)ptr;
411 8931 : }
412 :
413 : /* fd_shred_merkle_root: Assuming that `shred` is a Merkle variant,
414 : reconstructs the merkle root from a shred and populates it in
415 : root_out. Returns 1 on success, 0 on failure. The output value must
416 : be ignored if a failure is returned. U.B. if the shred is not a
417 : merkle variant. */
418 : FD_FN_PURE int
419 : fd_shred_merkle_root( fd_shred_t const * shred, void * bmtree_mem, fd_bmtree_node_t * root_out );
420 :
421 : /* fd_shred_data_payload: Returns a pointer to a data shred payload.
422 :
423 : The provided shred must have passed validation in fd_shred_parse(),
424 : and must satisfy `type&FD_SHRED_TYPEMASK_DATA`
425 : where `uchar type = fd_shred_type( shred->variant )`. */
426 : FD_FN_CONST static inline uchar const *
427 9 : fd_shred_data_payload( fd_shred_t const * shred ) {
428 9 : return (uchar const *)shred + FD_SHRED_DATA_HEADER_SZ;
429 9 : }
430 :
431 : /* fd_shred_code_payload: Returns a pointer to a coding shred payload.
432 :
433 : The provided shred must have passed validation in fd_shred_parse(),
434 : and must satisfy `type&FD_SHRED_TYPEMASK_CODE`
435 : where `uchar type = fd_shred_type( shred->variant )`. */
436 : FD_FN_CONST static inline uchar const *
437 0 : fd_shred_code_payload( fd_shred_t const * shred ) {
438 0 : return (uchar const *)shred + FD_SHRED_CODE_HEADER_SZ;
439 0 : }
440 :
441 : /* fd_shred_chain_offset: Assuming that `shred` is a chained Merkle
442 : variant, compute the offset from the start of the shred to the start
443 : of the chained Merkle root. U.B. if the shred is not a chained
444 : variant. */
445 : FD_FN_CONST static inline ulong
446 67717101 : fd_shred_chain_off( uchar variant ) {
447 67717101 : ulong type = fd_shred_type( variant );
448 67717101 : return fd_ulong_if( type & FD_SHRED_TYPEMASK_CODE, FD_SHRED_MAX_SZ, FD_SHRED_MIN_SZ )
449 67717101 : - FD_SHRED_MERKLE_ROOT_SZ
450 67717101 : - fd_shred_merkle_sz( variant )
451 67717101 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
452 67717101 : }
453 :
454 : /* fd_shred_retrasmitter_sig_off: Assuming that `shred` is a resigned
455 : variant, compute the offset from the start of the shred to the start
456 : of the retransmitter signature. U.B if the shred is not a resigned
457 : chained type. */
458 : FD_FN_PURE static inline ulong
459 34941159 : fd_shred_retransmitter_sig_off( fd_shred_t const * shred ) {
460 34941159 : return fd_shred_sz( shred )-FD_SHRED_SIGNATURE_SZ;
461 34941159 : }
462 :
463 : FD_PROTOTYPES_END
464 :
465 : #endif /* HEADER_fd_src_ballet_shred_fd_shred_h */
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