mirror of
https://github.com/zeek/zeek.git
synced 2025-10-02 14:48:21 +00:00
Do not lookup ignore_checksums_nets for every packet
This could lead to a noticeable (single-percent) performance improvement. Most of the functionality for this is in the packet analyzers that now cache ignore_chesksums_nets. Based on a patch by Arne Welzel (Corelight).
This commit is contained in:
Johanna Amann
parent
d24cecf268
commit
8192ad581d
13 changed files with 101 additions and 7 deletions
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@ -25,6 +25,13 @@ type string_any_table: table[string] of any;
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## directly and then remove this alias.
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type string_set: set[string];
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## A set of subnets.
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##
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## .. todo:: We need this type definition only for declaring builtin functions
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## via ``bifcl``. We should extend ``bifcl`` to understand composite types
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## directly and then remove this alias.
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type subnet_set: set[subnet];
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## A set of addresses.
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##
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## .. todo:: We need this type definition only for declaring builtin functions
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@ -9,6 +9,14 @@ const IPPROTO_IPIP : count = 4;
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const IPPROTO_IPV6 : count = 41;
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const IPPROTO_GRE : count = 47;
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function analyzer_option_change_ignore_checksums_nets(ID: string, new_value: set[subnet], location: string) : set[subnet]
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{
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if ( ID == "ignore_checksums_nets" )
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PacketAnalyzer::__set_ignore_checksums_nets(new_value);
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return new_value;
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}
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event zeek_init() &priority=20
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{
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PacketAnalyzer::register_packet_analyzer(PacketAnalyzer::ANALYZER_IP, IPPROTO_IPIP, PacketAnalyzer::ANALYZER_IPTUNNEL);
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@ -19,4 +27,6 @@ event zeek_init() &priority=20
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PacketAnalyzer::register_packet_analyzer(PacketAnalyzer::ANALYZER_IP, IPPROTO_UDP, PacketAnalyzer::ANALYZER_UDP);
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PacketAnalyzer::register_packet_analyzer(PacketAnalyzer::ANALYZER_IP, IPPROTO_ICMP, PacketAnalyzer::ANALYZER_ICMP);
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PacketAnalyzer::register_packet_analyzer(PacketAnalyzer::ANALYZER_IP, IPPROTO_ICMP6, PacketAnalyzer::ANALYZER_ICMP);
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Option::set_change_handler("ignore_checksums_nets", analyzer_option_change_ignore_checksums_nets, 5);
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}
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@ -4,6 +4,7 @@ module PacketAnalyzer;
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#include "zeek/packet_analysis/Analyzer.h"
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#include "zeek/packet_analysis/Manager.h"
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#include "zeek/packet_analysis/protocol/ip/IPBasedAnalyzer.h"
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%%}
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@ -47,3 +48,13 @@ function try_register_packet_analyzer_by_name%(parent: string, identifier: count
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parent_analyzer->RegisterProtocol(identifier, child_analyzer);
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return zeek::val_mgr->True();
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%}
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## Internal function that is used to update the core-mirror of the script-level `ignore_checksums_nets` variable.
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function PacketAnalyzer::__set_ignore_checksums_nets%(v: subnet_set%) : bool
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%{
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if ( v->GetType()->Tag() != zeek::TYPE_TABLE )
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zeek::emit_builtin_error("update_ignore_checksums_net() requires a table/set argument");
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zeek::packet_analysis::IP::IPBasedAnalyzer::SetIgnoreChecksumsNets(zeek::IntrusivePtr{zeek::NewRef{}, v->AsTableVal()});
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return zeek::val_mgr->True();
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%}
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@ -77,7 +77,7 @@ void ICMPAnalyzer::DeliverPacket(Connection* c, double t, bool is_orig, int rema
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const std::unique_ptr<IP_Hdr>& ip = pkt->ip_hdr;
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if ( ! zeek::detail::ignore_checksums &&
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! zeek::id::find_val<TableVal>("ignore_checksums_nets")->Contains(ip->IPHeaderSrcAddr()) &&
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! GetIgnoreChecksumsNets()->Contains(ip->IPHeaderSrcAddr()) &&
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remaining >= len )
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{
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int chksum = 0;
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@ -1,6 +1,7 @@
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// See the file "COPYING" in the main distribution directory for copyright.
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#include "zeek/packet_analysis/protocol/ip/IP.h"
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#include "zeek/packet_analysis/protocol/ip/IPBasedAnalyzer.h"
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#include "zeek/NetVar.h"
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#include "zeek/IP.h"
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#include "zeek/Discard.h"
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@ -128,7 +129,7 @@ bool IPAnalyzer::AnalyzePacket(size_t len, const uint8_t* data, Packet* packet)
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return false;
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if ( ! packet->l2_checksummed && ! detail::ignore_checksums && ip4 &&
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! zeek::id::find_val<TableVal>("ignore_checksums_nets")->Contains(packet->ip_hdr->IPHeaderSrcAddr()) &&
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! IPBasedAnalyzer::GetIgnoreChecksumsNets()->Contains(packet->ip_hdr->IPHeaderSrcAddr()) &&
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detail::in_cksum(reinterpret_cast<const uint8_t*>(ip4), ip_hdr_len) != 0xffff )
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{
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Weird("bad_IP_checksum", packet);
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@ -282,3 +282,18 @@ void IPBasedAnalyzer::DumpPortDebug()
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DBG_LOG(DBG_ANALYZER, " %d/%s: %s", mapping.first, transport_proto_string(transport), s.c_str());
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}
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}
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TableValPtr IPBasedAnalyzer::ignore_checksums_nets_table = nullptr;
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void IPBasedAnalyzer::SetIgnoreChecksumsNets(TableValPtr t)
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{
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IPBasedAnalyzer::ignore_checksums_nets_table = t;
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}
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TableValPtr IPBasedAnalyzer::GetIgnoreChecksumsNets()
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{
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if ( ! IPBasedAnalyzer::ignore_checksums_nets_table )
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IPBasedAnalyzer::ignore_checksums_nets_table = zeek::id::find_val<TableVal>("ignore_checksums_nets");
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return IPBasedAnalyzer::ignore_checksums_nets_table;
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}
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@ -7,6 +7,7 @@
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#include "zeek/packet_analysis/Analyzer.h"
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#include "zeek/analyzer/Tag.h"
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#include "zeek/ID.h"
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namespace zeek::analyzer::pia { class PIA; }
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@ -61,6 +62,25 @@ public:
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*/
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void DumpPortDebug();
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/**
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* Updates the internal pointer to the script-level variable `ignore_checksums_nets`.
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* This is used to prevent repeated (costly) lookup of the script-level variable
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* by IP-based analyzers.
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*
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* @param t New value of ignore_checksums_nets
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*/
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static void SetIgnoreChecksumsNets(TableValPtr t);
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/**
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* Gets the interpal pointer to the script-level variable `ignore_checksums_nets`.
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* This is used to prevent repeated (costly) lookup of the script-level variable
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* by IP-based analyzers.
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*
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* @return Current value of `ignore_checksums_nets`.
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*/
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static TableValPtr GetIgnoreChecksumsNets();
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protected:
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/**
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@ -178,6 +198,7 @@ private:
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TransportProto transport;
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uint32_t server_port_mask;
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static TableValPtr ignore_checksums_nets_table;
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};
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}
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@ -18,7 +18,6 @@ TCPAnalyzer::TCPAnalyzer() : IPBasedAnalyzer("TCP", TRANSPORT_TCP, TCP_PORT_MASK
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void TCPAnalyzer::Initialize()
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{
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ignored_nets = zeek::id::find_val<TableVal>("ignore_checksums_nets");
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}
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SessionAdapter* TCPAnalyzer::MakeSessionAdapter(Connection* conn)
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@ -164,7 +163,7 @@ bool TCPAnalyzer::ValidateChecksum(const IP_Hdr* ip, const struct tcphdr* tp,
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{
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if ( ! run_state::current_pkt->l3_checksummed &&
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! detail::ignore_checksums &&
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! ignored_nets->Contains(ip->IPHeaderSrcAddr()) &&
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! GetIgnoreChecksumsNets()->Contains(ip->IPHeaderSrcAddr()) &&
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caplen >= len && ! endpoint->ValidChecksum(tp, len, ip->IP4_Hdr()) )
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{
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adapter->Weird("bad_TCP_checksum");
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@ -86,8 +86,6 @@ private:
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bool ValidateChecksum(const IP_Hdr* ip, const struct tcphdr* tp,
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analyzer::tcp::TCP_Endpoint* endpoint,
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int len, int caplen, TCPSessionAdapter* adapter);
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TableValPtr ignored_nets;
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};
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}
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@ -108,7 +108,7 @@ void UDPAnalyzer::DeliverPacket(Connection* c, double t, bool is_orig, int remai
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auto validate_checksum =
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! run_state::current_pkt->l3_checksummed &&
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! zeek::detail::ignore_checksums &&
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! zeek::id::find_val<TableVal>("ignore_checksums_nets")->Contains(ip->IPHeaderSrcAddr()) &&
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! GetIgnoreChecksumsNets()->Contains(ip->IPHeaderSrcAddr()) &&
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remaining >=len;
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constexpr auto vxlan_len = 8;
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@ -0,0 +1,11 @@
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### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
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#separator \x09
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#set_separator ,
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#empty_field (empty)
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#unset_field -
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#path weird
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#open XXXX-XX-XX-XX-XX-XX
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#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p name addl notice peer source
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#types time string addr port addr port string string bool string string
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XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 192.168.1.28 53246 35.221.46.9 80 bad_TCP_checksum - F zeek TCP
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#close XXXX-XX-XX-XX-XX-XX
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@ -584,6 +584,7 @@
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0.000000 MetaHookPost CallFunction(Option::set_change_handler, <frame>, (default_file_bof_buffer_size, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100)) -> <no result>
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0.000000 MetaHookPost CallFunction(Option::set_change_handler, <frame>, (default_file_timeout_interval, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100)) -> <no result>
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0.000000 MetaHookPost CallFunction(Option::set_change_handler, <frame>, (ignore_checksums_nets, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100)) -> <no result>
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0.000000 MetaHookPost CallFunction(Option::set_change_handler, <frame>, (ignore_checksums_nets, PacketAnalyzer::IP::analyzer_option_change_ignore_checksums_nets{ if (ignore_checksums_nets == PacketAnalyzer::IP::ID) PacketAnalyzer::__set_ignore_checksums_nets(PacketAnalyzer::IP::new_value)return (PacketAnalyzer::IP::new_value)}, 5)) -> <no result>
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0.000000 MetaHookPost CallFunction(Option::set_change_handler, <frame>, (udp_content_delivery_ports_use_resp, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100)) -> <no result>
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0.000000 MetaHookPost CallFunction(Option::set_change_handler, <frame>, (udp_content_ports, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100)) -> <no result>
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0.000000 MetaHookPost CallFunction(PacketAnalyzer::register_packet_analyzer, <frame>, (PacketAnalyzer::ANALYZER_ETHERNET, 2048, PacketAnalyzer::ANALYZER_IP)) -> <no result>
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@ -1635,6 +1636,7 @@
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0.000000 MetaHookPre CallFunction(Option::set_change_handler, <frame>, (default_file_bof_buffer_size, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100))
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0.000000 MetaHookPre CallFunction(Option::set_change_handler, <frame>, (default_file_timeout_interval, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100))
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0.000000 MetaHookPre CallFunction(Option::set_change_handler, <frame>, (ignore_checksums_nets, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100))
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0.000000 MetaHookPre CallFunction(Option::set_change_handler, <frame>, (ignore_checksums_nets, PacketAnalyzer::IP::analyzer_option_change_ignore_checksums_nets{ if (ignore_checksums_nets == PacketAnalyzer::IP::ID) PacketAnalyzer::__set_ignore_checksums_nets(PacketAnalyzer::IP::new_value)return (PacketAnalyzer::IP::new_value)}, 5))
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0.000000 MetaHookPre CallFunction(Option::set_change_handler, <frame>, (udp_content_delivery_ports_use_resp, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100))
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0.000000 MetaHookPre CallFunction(Option::set_change_handler, <frame>, (udp_content_ports, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100))
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0.000000 MetaHookPre CallFunction(PacketAnalyzer::register_packet_analyzer, <frame>, (PacketAnalyzer::ANALYZER_ETHERNET, 2048, PacketAnalyzer::ANALYZER_IP))
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@ -2685,6 +2687,7 @@
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0.000000 | HookCallFunction Option::set_change_handler(default_file_bof_buffer_size, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100)
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0.000000 | HookCallFunction Option::set_change_handler(default_file_timeout_interval, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100)
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0.000000 | HookCallFunction Option::set_change_handler(ignore_checksums_nets, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100)
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0.000000 | HookCallFunction Option::set_change_handler(ignore_checksums_nets, PacketAnalyzer::IP::analyzer_option_change_ignore_checksums_nets{ if (ignore_checksums_nets == PacketAnalyzer::IP::ID) PacketAnalyzer::__set_ignore_checksums_nets(PacketAnalyzer::IP::new_value)return (PacketAnalyzer::IP::new_value)}, 5)
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0.000000 | HookCallFunction Option::set_change_handler(udp_content_delivery_ports_use_resp, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100)
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0.000000 | HookCallFunction Option::set_change_handler(udp_content_ports, Config::config_option_changed{ Config::log = Config::Info($ts=network_time(), $id=Config::ID, $old_value=Config::format_value(lookup_ID(Config::ID)), $new_value=Config::format_value(Config::new_value))if ( != Config::location) Config::log$location = Config::locationLog::write(Config::LOG, to_any_coerceConfig::log)return (Config::new_value)}, -100)
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0.000000 | HookCallFunction PacketAnalyzer::register_packet_analyzer(PacketAnalyzer::ANALYZER_ETHERNET, 2048, PacketAnalyzer::ANALYZER_IP)
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18
testing/btest/core/checksums_ignore_nets_runtime_update.test
Normal file
18
testing/btest/core/checksums_ignore_nets_runtime_update.test
Normal file
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@ -0,0 +1,18 @@
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# @TEST-DOC: Use Config::set_value() to clear ignore_checksums_nets after having received a few packets. Expect a bad_TCP_checksum weird.log entry due to the following packets.
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# @TEST-EXEC: zeek -b -r $TRACES/chksums/localhost-bad-chksum.pcap "ignore_checksums_nets += {192.168.0.0/16}" %INPUT
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# @TEST-EXEC: btest-diff weird.log
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@load base/frameworks/config
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@load base/frameworks/notice
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global packet_counter = 0;
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event new_packet(c: connection, p: pkt_hdr)
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{
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++packet_counter;
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if ( packet_counter > 3 )
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{
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local s: set[subnet] = set();
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Config::set_value("ignore_checksums_nets", s);
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}
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}
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