January 2023 - dev

[PATCH] tcp: Explicitly check option length field values in tcp_opt_get()
by Stefano Brivio 05 Jan '23

05 Jan '23

Reported by Coverity (CWE-606, Untrusted loop bound), and actually harmless because we'll exit the option-scanning loop if the remaining length is not enough for a new option, instead of reading past the header. In any case, it looks like a good idea to explicitly check for reasonable values of option lengths. Signed-off-by: Stefano Brivio <sbrivio(a)redhat.com> --- tcp.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tcp.c b/tcp.c index 26037b3..1e0a338 100644 --- a/tcp.c +++ b/tcp.c @@ -1117,6 +1117,10 @@ static int tcp_opt_get(const char *opts, size_t len, uint8_t type_find, break; default: type = *(opts++); + + if (*(uint8_t *)opts < 2 || *(uint8_t *)opts > len) + return -1; + optlen = *(opts++) - 2; len -= 2; -- 2.35.1

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[PATCH v3 0/8] Don't use additional sockets for receiving "spliced" UDP communications
by David Gibson 05 Jan '23

05 Jan '23

At present, the UDP "splice" and "tap" paths are quite separate. We have separate sockets to receive packets bound for the tap and splice paths. This leads to some code duplication, and extra open sockets. This series partially unifies the two paths, allowing us to use a single (host side) socket, bound to 0.0.0.0 or :: to receive packets for both cases. Changes since v2: * Don't receive multiple packets at once for pasta mode - seems to hurt throughput on balance. * Add some comments clarifying reasoning here. Changes since v1: * Renamed udp_localname[46] to udp[46]_localname * Allow handling of UDP port 0 * Fix a bug which could misidentify certain v6 packets as v4-spliceable * Some minor cosmetic fixes to code and commit messages David Gibson (8): udp: Move sending pasta tap frames to the end of udp_sock_handler() udp: Split sending to passt tap interface into separate function udp: Split receive from preparation and send in udp_sock_handler() udp: Don't handle tap receive batch size calculation within a #define udp: Pre-populate msg_names with local address udp: Unify udp_sock_handler_splice() with udp_sock_handler() udp: Decide whether to "splice" per datagram rather than per socket udp: Don't use separate sockets to listen for spliced packets udp.c | 389 ++++++++++++++++++++++++++++++--------------------------- udp.h | 2 +- util.h | 7 ++ 3 files changed, 214 insertions(+), 184 deletions(-) -- 2.39.0

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[PATCH] test/perf/pasta_tcp: Add host to namespace cases for traffic via tap
by Stefano Brivio 05 Jan '23

05 Jan '23

Similarly to UDP cases, these were missing as it wasn't clear, when the other tests were introduced, if using the global address of a namespace, from the host, should have resulted in connections being routed via the tap interface. Signed-off-by: Stefano Brivio <sbrivio(a)redhat.com> --- test/perf/pasta_tcp | 57 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) diff --git a/test/perf/pasta_tcp b/test/perf/pasta_tcp index 1847c83..8ebb25c 100644 --- a/test/perf/pasta_tcp +++ b/test/perf/pasta_tcp @@ -240,4 +240,61 @@ nsout LAT tcp_crr --nolog -P 10003 -C 10013 -4 -c -H __GW__ | sed -n 's/^through hostw lat __LAT__ 1500 500 + +tr TCP throughput over IPv6: host to ns +nsout IFNAME ip -j link show | jq -rM '.[] | select(.link_type == "ether").ifname' +nsout ADDR6 ip -j -6 addr show|jq -rM '.[] | select(.ifname == "__IFNAME__").addr_info[] | select(.scope == "global" and .prefixlen == 64).local' +bw - +bw - +bw - +iperf3 BW host ns __ADDR6__ 100${i}2 __THREADS__ __TIME__ __OPTS__ +bw __BW__ 8.0 10.0 + +tl TCP RR latency over IPv6: host to ns +lat - +lat - +lat - +nsb tcp_rr --nolog -P 10002 -C 10012 -6 +hout LAT tcp_rr --nolog -P 10002 -C 10012 -6 -c -H __ADDR6__ | sed -n 's/^throughput=$.*$/\1/p' +nsw +lat __LAT__ 150 100 + +tl TCP CRR latency over IPv6: host to ns +lat - +lat - +lat - +sleep 1 +nsb tcp_crr --nolog -P 10002 -C 10012 -6 +hout LAT tcp_crr --nolog -P 10002 -C 10012 -6 -c -H __ADDR6__ | sed -n 's/^throughput=$.*$/\1/p' +nsw +lat __LAT__ 5000 10000 + + +tr TCP throughput over IPv4: host to ns +nsout ADDR ip -j -4 addr show|jq -rM '.[] | select(.ifname == "__IFNAME__").addr_info[0].local' +bw - +bw - +bw - +iperf3 BW host ns __ADDR__ 100${i}2 __THREADS__ __TIME__ __OPTS__ +bw __BW__ 8.0 10.0 + +tl TCP RR latency over IPv4: host to ns +lat - +lat - +lat - +nsb tcp_rr --nolog -P 10002 -C 10012 -4 +hout LAT tcp_rr --nolog -P 10002 -C 10012 -4 -c -H __ADDR__ | sed -n 's/^throughput=$.*$/\1/p' +nsw +lat __LAT__ 150 100 + +tl TCP CRR latency over IPv4: host to ns +lat - +lat - +lat - +sleep 1 +nsb tcp_crr --nolog -P 10002 -C 10012 -4 +hout LAT tcp_crr --nolog -P 10002 -C 10012 -4 -c -H __ADDR__ | sed -n 's/^throughput=$.*$/\1/p' +nsw +lat __LAT__ 5000 10000 + te -- 2.35.1

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[PATCH 0/8] Don't use additional sockets for receiving "spliced" UDP communications
by David Gibson 04 Jan '23

04 Jan '23

At present, the UDP "splice" and "tap" paths are quite separate. We have separate sockets to receive packets bound for the tap and splice paths. This leads to some code duplication, and extra open sockets. This series partially unifies the two paths, allowing us to use a single (host side) socket, bound to 0.0.0.0 or :: to receive packets for both cases. This is based on my earlier series with some fixes for the tap path. David Gibson (8): udp: Move sending pasta tap frames to the end of udp_sock_handler() udp: Split sending to passt tap interface into separate function udp: Split receive from preparation and send in udp_sock_handler() udp: Receive multiple datagrams at once on the pasta sock->tap path udp: Pre-populate msg_names with local address udp: Unify udp_sock_handler_splice() with udp_sock_handler() udp: Decide whether to "splice" per datagram rather than per socket udp: Don't use separate sockets to listen for spliced packets udp.c | 382 ++++++++++++++++++++++++++++++--------------------------- udp.h | 2 +- util.h | 7 ++ 3 files changed, 207 insertions(+), 184 deletions(-) -- 2.38.1

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[PATCH] test/perf/pasta_udp: Add host to namespace cases for traffic via tap
by Stefano Brivio 04 Jan '23

04 Jan '23

These were missing as it wasn't clear, when the other tests were introduced, if using the global address of a namespace, from the host, should have resulted in traffic being routed via the tap interface (as opposed to the loopback interface). We now clarified that's actually the case. Use same values and thresholds as the tests for loopback traffic, as throughput figures currently indicate there isn't much difference. Signed-off-by: Stefano Brivio <sbrivio(a)redhat.com> --- Contrary to what I stated a while ago, there's actually no need to adapt the "code" writing the JavaScript snippets for performance reports -- the trick is simply to keep those ordered like the previous ones, and we'll get the right output. test/perf/pasta_udp | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/test/perf/pasta_udp b/test/perf/pasta_udp index 27ea724..112d70d 100644 --- a/test/perf/pasta_udp +++ b/test/perf/pasta_udp @@ -179,4 +179,41 @@ nsout LAT udp_rr --nolog -P 10003 -C 10013 -4 -c -H __GW__ | sed -n 's/^throughp hostw lat __LAT__ 200 150 + +tr UDP throughput over IPv6: host to ns +nsout IFNAME ip -j link show | jq -rM '.[] | select(.link_type == "ether").ifname' +nsout ADDR6 ip -j -6 addr show|jq -rM '.[] | select(.ifname == "__IFNAME__").addr_info[] | select(.scope == "global" and .prefixlen == 64).local' +bw - +bw - +bw - +iperf3 BW host ns __ADDR6__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 15G +bw __BW__ 7.0 9.0 + +tl UDP RR latency over IPv6: host to ns +lat - +lat - +lat - +nsb udp_rr --nolog -P 10002 -C 10012 -6 +hout LAT udp_rr --nolog -P 10002 -C 10012 -6 -c -H __ADDR6__ | sed -n 's/^throughput=$.*$/\1/p' +nsw +lat __LAT__ 200 150 + + +tr UDP throughput over IPv4: host to ns +nsout ADDR ip -j -4 addr show|jq -rM '.[] | select(.ifname == "__IFNAME__").addr_info[0].local' +bw - +bw - +bw - +iperf3 BW host ns __ADDR__ 100${i}2 __THREADS__ __TIME__ __OPTS__ -b 15G +bw __BW__ 7.0 9.0 + +tl UDP RR latency over IPv4: host to ns +lat - +lat - +lat - +nsb udp_rr --nolog -P 10002 -C 10012 -4 +hout LAT udp_rr --nolog -P 10002 -C 10012 -4 -c -H __ADDR__ | sed -n 's/^throughput=$.*$/\1/p' +nsw +lat __LAT__ 200 150 + te -- 2.35.1

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