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 1494385 : #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 2371765 : #define FD_SHRED_MIN_SZ (1203UL)
89 : /* FD_SHRED_DATA_HEADER_SZ: size of all headers for data type shreds. */
90 760405 : #define FD_SHRED_DATA_HEADER_SZ (0x58UL)
91 : /* FD_SHRED_CODE_HEADER_SZ: size of all headers for coding type shreds. */
92 452580 : #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 1000 : #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 895770 : #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 1179004 : #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 1786785 : #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 1786785 : #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 3577655 : #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 3577655 : #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 1179004 : #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 2234447 : #define FD_SHRED_MERKLE_ROOT_SZ (32UL)
130 : /* FD_SHRED_MERKLE_NODE_SZ: the size of a merkle inclusion proof node in bytes. */
131 1650155 : #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 9144 : #define FD_SHRED_MERKLE_LAYER_CNT (7UL)
134 : /* FD_SHRED_SIGNATURE_SZ: the size of a signature in a shred. */
135 1791106 : #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 : #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 154923 : #define FD_SHRED_DATA_FLAG_SLOT_COMPLETE ((uchar)0x80)
148 : /* Mask of the "data batch complete" bit in shred.data.flags */
149 301168 : #define FD_SHRED_DATA_FLAG_DATA_COMPLETE ((uchar)0x40)
150 :
151 : /* FD_SHRED_PROTOCOL_BLK_MAX is Agave's MAX_DATA_SHREDS_PER_SLOT, the
152 : largest per-slot shred limit of any slot params regime (400ms). */
153 455481 : #define FD_SHRED_PROTOCOL_BLK_MAX (1UL<<15) /* 32,768 shreds */
154 :
155 : /* Maximum number of data shreds in a slot, also maximum number of
156 : parity shreds in a slot, at the 200ms slot params (SIMD-525).
157 : Clusters with a larger per-slot shred limit (slower slots) are not
158 : supported: shreds past this index are dropped. */
159 2000 : #define FD_SHRED_BLK_MAX (1 << 14UL) /* 16,384 shreds */
160 :
161 : /* Many static bounds are specified around the assumption that this is a
162 : protocol limit on the max number of shreds in a slot. If this limit
163 : changes, all the relevant usages in other areas of the Firedancer
164 : codebase should be updated before modifying this assertion. */
165 :
166 : FD_STATIC_ASSERT( FD_SHRED_BLK_MAX == 16384, check all usages before changing this limit! );
167 :
168 : /* Largest [development.bench.max_shreds_per_block] a benchmark cluster
169 : may raise the per-block shred limit to: the repair's fec_set_idx is
170 : 28 bits. Sizes what must hold any configurable limit (repair proof
171 : depth). */
172 0 : #define FD_SHRED_BLK_MAX_RAISED (1UL<<28)
173 :
174 : /* 18,268,160 bytes per slot */
175 1000 : #define FD_SHRED_DATA_PAYLOAD_MAX_PER_SLOT (FD_SHRED_DATA_PAYLOAD_MAX * FD_SHRED_BLK_MAX)
176 :
177 : /* Firedancer-specific internal error codes.
178 :
179 : These are not part of the Solana protocol. */
180 :
181 : #define FD_SHRED_EBATCH 0x4000 /* End of batch reached (success)
182 : no more shreds and found FD_SHRED_DATA_FLAG_DATA_COMPLETE */
183 : #define FD_SHRED_ESLOT 0x8000 /* End of slot reached (success)
184 : no more shreds and found FD_SHRED_DATA_FLAG_SLOT_COMPLETE */
185 : #define FD_SHRED_ENOMEM 12 /* Error: Target buffer too small */
186 : #define FD_SHRED_EINVAL 22 /* Error: Invalid shred data */
187 : #define FD_SHRED_EPIPE 32 /* Error: Expected data in source buffer, got EOF */
188 :
189 : /* Primary shred data structure.
190 : Relies heavily on packed fields and unaligned memory accesses. */
191 : struct __attribute__((packed)) fd_shred {
192 : /* Ed25519 signature over the shred
193 :
194 : For legacy type shreds, signs over content of the shred structure past this signature field.
195 : For merkle type shreds, signs over the first node of the inclusion proof (merkle root). */
196 : /* 0x00 */ fd_ed25519_sig_t signature;
197 :
198 : /* Shred variant specifier
199 : Consists of two four bit fields. (Deliberately not using bit fields here)
200 :
201 : The high four bits indicate the shred type:
202 : - 0101: legacy code
203 : - 1010: legacy data
204 : - 0100: merkle code
205 : - 0110: merkle code (chained)
206 : - 0111: merkle code (chained resigned)
207 : - 1000: merkle data
208 : - 1001: merkle data (chained)
209 : - 1011: merkle data (chained resigned)
210 :
211 : For legacy type shreds, the low four bits are set to static patterns.
212 : For merkle type shreds, the low four bits are set to the number of non-root nodes in the inclusion proof.
213 : For merkle code type shreds, the 3rd highest bit represents if the merkle tree is chained.
214 : For merkle data type shreds, the 4th highest bit represents if the merkle tree is chained.
215 : For merkle code type shreds, the 4th highest bit represents if the shred is resigned.
216 : For merkle data type shreds, the 3th highest bit represents if the shred is resigned.
217 : */
218 : /* 0x40 */ uchar variant;
219 :
220 : /* Slot number that this shred is part of */
221 : /* 0x41 */ ulong slot;
222 :
223 : /* Index of this shred within the slot */
224 : /* 0x49 */ uint idx;
225 :
226 : /* Hash of the genesis version and historical hard forks of the current chain */
227 : /* 0x4d */ ushort version;
228 :
229 : /* Index into the vector of FEC sets for this slot. For data shreds, fec_set_idx<=idx. */
230 : /* 0x4f */ uint fec_set_idx;
231 :
232 : union {
233 : /* Common data shred header */
234 : struct __attribute__((packed)) {
235 : /* Slot number difference between this block and the parent block.
236 : parent_off <= slot.
237 : Always greater than zero, except for slot 0, in which case the
238 : previous invariant forces this to be 0. */
239 : /* 0x53 */ ushort parent_off;
240 :
241 : /* Bit field (MSB first)
242 : See FD_SHRED_DATA_FLAG_*
243 :
244 : [XX.. ....] Block complete? 0b00=no 0b01=no 0b11=yes (implies Entry batch complete)
245 : [.X.. ....] Entry batch complete? 0b0=no 0b1=yes
246 : [..XX XXXX] Reference tick number */
247 : /* 0x55 */ uchar flags;
248 :
249 : /* Shred size: size of data shred headers (88 bytes) + payload length */
250 : /* 0x56 */ ushort size;
251 : } data;
252 :
253 : /* Common coding shred header */
254 : struct __attribute__((packed)) {
255 : /* Total number of data shreds in FEC set. Must be positive, with
256 : data_cnt+code_cnt<=256. */
257 : /* 0x53 */ ushort data_cnt;
258 :
259 : /* Total number of coding shreds in FEC set. Must be positive. */
260 : /* 0x55 */ ushort code_cnt;
261 :
262 : /* Index within the vector of coding shreds in FEC set. In [0,
263 : code_cnt). Also, shred.code.idx <= shred.idx. */
264 : /* 0x57 */ ushort idx;
265 : } code;
266 : };
267 : };
268 : typedef struct fd_shred fd_shred_t;
269 :
270 : FD_PROTOTYPES_BEGIN
271 :
272 : /* fd_shred_parse: Parses and validates an untrusted shred stored in
273 : bytes buf[i] for i in [0, sz). sz must be at least FD_SHRED_MIN_SZ bytes.
274 : Allows trailing data. max_shred_idx is the exclusive upper bound for
275 : data/parity shred indices within a slot, similar to max_shred_idx in
276 : fd_fec_resolver.
277 :
278 : The returned pointer either equals the input pointer or is NULL if
279 : the given shred is malformed or violates any invariants described
280 : above. */
281 : FD_FN_PURE fd_shred_t const *
282 : fd_shred_parse( uchar const * buf,
283 : ulong sz,
284 : ulong max_shred_idx );
285 :
286 : /* fd_shred_type: Returns the value of the shred's type field. (FD_SHRED_TYPE_*) */
287 : FD_FN_CONST static inline uchar
288 5503721 : fd_shred_type( uchar variant ) {
289 5503721 : return variant & 0xf0;
290 5503721 : }
291 :
292 : /* fd_shred_variant: Returns the encoded variant field
293 : given the shred type and merkle proof length. */
294 : FD_FN_CONST static inline uchar
295 : fd_shred_variant( uchar type,
296 9146 : uchar merkle_cnt ) {
297 9146 : if( FD_LIKELY( type==FD_SHRED_TYPE_LEGACY_DATA ) )
298 0 : merkle_cnt = 0x05;
299 9146 : if( FD_LIKELY( type==FD_SHRED_TYPE_LEGACY_CODE ) )
300 0 : merkle_cnt = 0x0a;
301 9146 : return (uchar)(type | merkle_cnt);
302 9146 : }
303 :
304 : FD_FN_PURE static inline ulong
305 448051 : fd_shred_sz( fd_shred_t const * shred ) {
306 448051 : uchar type = fd_shred_type( shred->variant );
307 448051 : return fd_ulong_if(
308 448051 : type & FD_SHRED_TYPEMASK_CODE,
309 448051 : FD_SHRED_MAX_SZ,
310 448051 : fd_ulong_if( type==FD_SHRED_TYPE_LEGACY_DATA, shred->data.size, FD_SHRED_MIN_SZ)
311 448051 : ); /* Legacy data */
312 448051 : }
313 :
314 : /* fd_shred_header_sz: Returns the header size of a shred.
315 : Returns zero if the shred has an invalid variant. */
316 : FD_FN_CONST static inline ulong
317 602902 : fd_shred_header_sz( uchar variant ) {
318 602902 : uchar type = fd_shred_type( variant );
319 602902 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_DATA ) )
320 447710 : return FD_SHRED_DATA_HEADER_SZ;
321 155192 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_CODE ) )
322 155393 : return FD_SHRED_CODE_HEADER_SZ;
323 >1844*10^16 : return 0;
324 155192 : }
325 :
326 : /* fd_shred_merkle_cnt: Returns number of nodes in the merkle inclusion
327 : proof. Note that this excludes the root. Returns zero if the given
328 : shred is not a merkle variant. */
329 : FD_FN_CONST static inline uint
330 1936788 : fd_shred_merkle_cnt( uchar variant ) {
331 1936788 : uchar type = fd_shred_type( variant );
332 1936788 : if( FD_UNLIKELY( ( type == FD_SHRED_TYPE_LEGACY_DATA ) | ( type == FD_SHRED_TYPE_LEGACY_CODE ) ) )
333 0 : return 0;
334 1936788 : return (variant&0xfU);
335 1936788 : }
336 :
337 : /* fd_shred_merkle_sz: Returns the size in bytes of the merkle inclusion proof.
338 : Returns zero if the given shred is not a merkle variant. */
339 : FD_FN_CONST static inline ulong
340 1489122 : fd_shred_merkle_sz( uchar variant ) {
341 1489122 : return fd_shred_merkle_cnt( variant ) * FD_SHRED_MERKLE_NODE_SZ;
342 1489122 : }
343 :
344 :
345 : /* fd_shred_is_chained: Returns true if the shred is a chained merkle data or code shred. */
346 : FD_FN_CONST static inline uchar
347 1786785 : fd_shred_is_chained( ulong type ) {
348 1786785 : return (uchar)(
349 1786785 : ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED )
350 1786785 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED )
351 1786785 : | ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED )
352 1786785 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED ) );
353 1786785 : }
354 :
355 : /* fd_shred_is_resigned: Returns true if the shred is resigned by the retransmitter */
356 : FD_FN_CONST static inline uchar
357 1790870 : fd_shred_is_resigned( ulong type ) {
358 1790870 : return ( type == FD_SHRED_TYPE_MERKLE_DATA_CHAINED_RESIGNED )
359 1790870 : | ( type == FD_SHRED_TYPE_MERKLE_CODE_CHAINED_RESIGNED );
360 1790870 : }
361 :
362 : /* fd_shred_is_{data,code} return 1 if the provided shred type is one of
363 : the data (or code, respectively) types, and 0 if not. The value
364 : provided for type must be a valid shred type (one of the
365 : FD_SHRED_TYPE_* values). For the purposes of these functions,
366 : properties beyond data/code are ignored; e.g. a chained resigned
367 : Merkle data shred is considered a data shred. */
368 150897 : FD_FN_CONST static inline uchar fd_shred_is_data( ulong type ) { return (type & 0xC0UL)==0x80UL; }
369 0 : FD_FN_CONST static inline uchar fd_shred_is_code( ulong type ) { return (type & 0xC0UL)==0x40UL; }
370 :
371 : /* fd_shred_swap_type: changes data into code or vice versa without
372 : affecting legacy, merkle, chained, or resigned status. For example,
373 : fd_shred_swap_type( chained resigned data ) == chained resigned code.
374 : fd_shred_swap_type( merkle code ) == merkle data. */
375 : FD_FN_CONST static inline uchar
376 155400 : fd_shred_swap_type( ulong type ) {
377 : /* Swap bits 4 and 5. Swap bits 6 and 7. */
378 155400 : return (uchar)(((type & 0x50UL)<<1) | ((type&0xA0UL)>>1));
379 155400 : }
380 :
381 : /* fd_shred_payload_sz: Returns the payload size of a shred.
382 : Undefined behavior if the shred has not passed `fd_shred_parse`. */
383 : FD_FN_PURE static inline ulong
384 150645 : fd_shred_payload_sz( fd_shred_t const * shred ) {
385 150645 : ulong type = fd_shred_type( shred->variant );
386 150645 : if( FD_LIKELY( type & FD_SHRED_TYPEMASK_DATA ) ) {
387 150634 : return shred->data.size - FD_SHRED_DATA_HEADER_SZ;
388 150634 : } else {
389 11 : return fd_shred_sz( shred ) - FD_SHRED_CODE_HEADER_SZ
390 11 : - fd_shred_merkle_sz( shred->variant )
391 11 : - fd_ulong_if( fd_shred_is_chained( type ), FD_SHRED_MERKLE_ROOT_SZ, 0 )
392 11 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
393 11 : }
394 150645 : }
395 :
396 : /* fd_shred_merkle_off: Returns the byte offset of the merkle inclusion proof of a shred.
397 :
398 : The provided shred must have passed validation in fd_shred_parse(). */
399 : FD_FN_PURE static inline ulong
400 155413 : fd_shred_merkle_off( fd_shred_t const * shred ) {
401 155413 : ulong type = fd_shred_type( shred->variant );
402 155413 : return fd_shred_sz( shred )
403 155413 : - fd_shred_merkle_sz( shred->variant )
404 155413 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
405 155413 : }
406 :
407 : /* fd_shred_merkle_nodes: Returns a pointer to the shred's merkle proof data.
408 :
409 : The provided shred must have passed validation in fd_shred_parse(). */
410 : FD_FN_PURE static inline fd_shred_merkle_t const *
411 9145 : fd_shred_merkle_nodes( fd_shred_t const * shred ) {
412 9145 : uchar const * ptr = (uchar const *)shred;
413 9145 : ptr += fd_shred_merkle_off( shred );
414 9145 : return (fd_shred_merkle_t const *)ptr;
415 9145 : }
416 :
417 : /* fd_shred_merkle_root: Assuming that `shred` is a Merkle variant,
418 : reconstructs the merkle root from a shred and populates it in
419 : root_out. Returns 1 on success, 0 on failure. The output value must
420 : be ignored if a failure is returned. U.B. if the shred is not a
421 : merkle variant. */
422 : int
423 : fd_shred_merkle_root( fd_shred_t const * shred, void * bmtree_mem, fd_bmtree_node_t * root_out );
424 :
425 : /* fd_shred_data_payload: Returns a pointer to a data shred payload.
426 :
427 : The provided shred must have passed validation in fd_shred_parse(),
428 : and must satisfy `type&FD_SHRED_TYPEMASK_DATA`
429 : where `uchar type = fd_shred_type( shred->variant )`. */
430 : FD_FN_CONST static inline uchar const *
431 10164 : fd_shred_data_payload( fd_shred_t const * shred ) {
432 10164 : return (uchar const *)shred + FD_SHRED_DATA_HEADER_SZ;
433 10164 : }
434 :
435 : /* fd_shred_code_payload: Returns a pointer to a coding shred payload.
436 :
437 : The provided shred must have passed validation in fd_shred_parse(),
438 : and must satisfy `type&FD_SHRED_TYPEMASK_CODE`
439 : where `uchar type = fd_shred_type( shred->variant )`. */
440 : FD_FN_CONST static inline uchar const *
441 0 : fd_shred_code_payload( fd_shred_t const * shred ) {
442 0 : return (uchar const *)shred + FD_SHRED_CODE_HEADER_SZ;
443 0 : }
444 :
445 : /* fd_shred_chain_offset: Assuming that `shred` is a chained Merkle
446 : variant, compute the offset from the start of the shred to the start
447 : of the chained Merkle root. U.B. if the shred is not a chained
448 : variant. */
449 : FD_FN_CONST static inline ulong
450 730953 : fd_shred_chain_off( uchar variant ) {
451 730953 : ulong type = fd_shred_type( variant );
452 730953 : return fd_ulong_if( type & FD_SHRED_TYPEMASK_CODE, FD_SHRED_MAX_SZ, FD_SHRED_MIN_SZ )
453 730953 : - FD_SHRED_MERKLE_ROOT_SZ
454 730953 : - fd_shred_merkle_sz( variant )
455 730953 : - fd_ulong_if( fd_shred_is_resigned( type ), FD_SHRED_SIGNATURE_SZ, 0 );
456 730953 : }
457 :
458 : /* fd_shred_retrasmitter_sig_off: Assuming that `shred` is a resigned
459 : variant, compute the offset from the start of the shred to the start
460 : of the retransmitter signature. U.B if the shred is not a resigned
461 : chained type. */
462 : FD_FN_PURE static inline ulong
463 0 : fd_shred_retransmitter_sig_off( fd_shred_t const * shred ) {
464 0 : return fd_shred_sz( shred )-FD_SHRED_SIGNATURE_SZ;
465 0 : }
466 :
467 : FD_PROTOTYPES_END
468 :
469 : #endif /* HEADER_fd_src_ballet_shred_fd_shred_h */
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