diff options
Diffstat (limited to 'package/network/services/dnsmasq/patches/0105-Optimse-RR-digest-calculation-in-DNSSEC.patch')
| -rw-r--r-- | package/network/services/dnsmasq/patches/0105-Optimse-RR-digest-calculation-in-DNSSEC.patch | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/package/network/services/dnsmasq/patches/0105-Optimse-RR-digest-calculation-in-DNSSEC.patch b/package/network/services/dnsmasq/patches/0105-Optimse-RR-digest-calculation-in-DNSSEC.patch new file mode 100644 index 0000000000..10f966237b --- /dev/null +++ b/package/network/services/dnsmasq/patches/0105-Optimse-RR-digest-calculation-in-DNSSEC.patch @@ -0,0 +1,122 @@ +From 059aded0700309308dafd9720b0313ce52f6e189 Mon Sep 17 00:00:00 2001 +From: Simon Kelley <simon@thekelleys.org.uk> +Date: Thu, 12 Nov 2020 23:09:15 +0000 +Subject: Optimse RR digest calculation in DNSSEC. + +If an RR is of a type which doesn't need canonicalisation, +bypass the relatively slow canonicalisation code, and insert +it direct into the digest. +--- + src/dnssec.c | 82 +++++++++++++++++++++++++++++++--------------------- + 1 file changed, 49 insertions(+), 33 deletions(-) + +--- a/src/dnssec.c ++++ b/src/dnssec.c +@@ -559,7 +559,7 @@ static int validate_rrset(time_t now, st + hash->update(ctx, (unsigned int)wire_len, (unsigned char*)keyname); + from_wire(keyname); + +-#define RRBUFLEN 300 /* Most RRs are smaller than this. */ ++#define RRBUFLEN 128 /* Most RRs are smaller than this. */ + + for (i = 0; i < rrsetidx; ++i) + { +@@ -597,50 +597,66 @@ static int validate_rrset(time_t now, st + hash->update(ctx, (unsigned int)wire_len, (unsigned char *)name_start); + hash->update(ctx, 4, p); /* class and type */ + hash->update(ctx, 4, (unsigned char *)&nsigttl); +- +- p += 8; /* skip class, type, ttl */ ++ ++ p += 8; /* skip type, class, ttl */ + GETSHORT(rdlen, p); + if (!CHECK_LEN(header, p, plen, rdlen)) + return STAT_BOGUS; +- +- /* canonicalise rdata and calculate length of same, use +- name buffer as workspace for get_rdata. */ +- state.ip = p; +- state.op = NULL; +- state.desc = rr_desc; +- state.buff = name; +- state.end = p + rdlen; +- +- for (j = 0; get_rdata(header, plen, &state); j++) +- if (j < RRBUFLEN) +- rrbuf[j] = *state.op; + +- len = htons((u16)j); +- hash->update(ctx, 2, (unsigned char *)&len); +- +- /* If the RR is shorter than RRBUFLEN (most of them, in practice) +- then we can just digest it now. If it exceeds RRBUFLEN we have to +- go back to the start and do it in chunks. */ +- if (j >= RRBUFLEN) ++ /* Optimisation for RR types which need no cannonicalisation. ++ This includes DNSKEY DS NSEC and NSEC3, which are also long, so ++ it saves lots of calls to get_rdata, and avoids the pessimal ++ segmented insertion, even with a small rrbuf[]. ++ ++ If canonicalisation is not needed, a simple insertion into the hash works. ++ */ ++ if (*rr_desc == (u16)-1) ++ { ++ len = htons(rdlen); ++ hash->update(ctx, 2, (unsigned char *)&len); ++ hash->update(ctx, rdlen, p); ++ } ++ else + { ++ /* canonicalise rdata and calculate length of same, use ++ name buffer as workspace for get_rdata. */ + state.ip = p; + state.op = NULL; + state.desc = rr_desc; +- ++ state.buff = name; ++ state.end = p + rdlen; ++ + for (j = 0; get_rdata(header, plen, &state); j++) ++ if (j < RRBUFLEN) ++ rrbuf[j] = *state.op; ++ ++ len = htons((u16)j); ++ hash->update(ctx, 2, (unsigned char *)&len); ++ ++ /* If the RR is shorter than RRBUFLEN (most of them, in practice) ++ then we can just digest it now. If it exceeds RRBUFLEN we have to ++ go back to the start and do it in chunks. */ ++ if (j >= RRBUFLEN) + { +- rrbuf[j] = *state.op; +- +- if (j == RRBUFLEN - 1) +- { +- hash->update(ctx, RRBUFLEN, rrbuf); +- j = -1; +- } ++ state.ip = p; ++ state.op = NULL; ++ state.desc = rr_desc; ++ ++ for (j = 0; get_rdata(header, plen, &state); j++) ++ { ++ rrbuf[j] = *state.op; ++ ++ if (j == RRBUFLEN - 1) ++ { ++ hash->update(ctx, RRBUFLEN, rrbuf); ++ j = -1; ++ } ++ } + } ++ ++ if (j != 0) ++ hash->update(ctx, j, rrbuf); + } +- +- if (j != 0) +- hash->update(ctx, j, rrbuf); + } + + hash->digest(ctx, hash->digest_size, digest); |