shaba/systemd-stable
1
1
Fork 0
mirror of https://github.com/systemd/systemd-stable.git synced 2025-01-14 19:24:13 +03:00
Code

resolved: use random_u64_range() for randomizing initial transaction jitter

Browse Source
This commit is contained in:
Lennart Poettering 2021-03-24 17:17:17 +01:00
parent ca55fb8840
commit 9ee18bf473
1 changed files with 4 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/resolve/resolved-dns-transaction.c
View File

@ -1941,23 +1941,20 @@ int dns_transaction_go(DnsTransaction *t) {
IN_SET(t->scope->protocol, DNS_PROTOCOL_LLMNR, DNS_PROTOCOL_MDNS)) {
usec_t jitter, accuracy;
/* RFC 4795 Section 2.7 suggests all queries should be
* delayed by a random time from 0 to JITTER_INTERVAL. */
/* RFC 4795 Section 2.7 suggests all queries should be delayed by a random time from 0 to
* JITTER_INTERVAL. */
t->initial_jitter_scheduled = true;
random_bytes(&jitter, sizeof(jitter));
switch (t->scope->protocol) {
case DNS_PROTOCOL_LLMNR:
jitter %= LLMNR_JITTER_INTERVAL_USEC;
jitter = random_u64_range(LLMNR_JITTER_INTERVAL_USEC);
accuracy = LLMNR_JITTER_INTERVAL_USEC;
break;
case DNS_PROTOCOL_MDNS:
jitter %= MDNS_JITTER_RANGE_USEC;
jitter += MDNS_JITTER_MIN_USEC;
jitter = usec_add(random_u64_range(MDNS_JITTER_RANGE_USEC), MDNS_JITTER_MIN_USEC);
accuracy = MDNS_JITTER_RANGE_USEC;
break;
default: