July 2025 - Linux-kselftest-mirror

[PATCH v14 net-next 00/14] AccECN protocol patch series

by chia-yu.chang＠nokia-bell-labs.com

From: Chia-Yu Chang <chia-yu.chang(a)nokia-bell-labs.com> Hello, Please find the v14 AccECN protocol patch series, which covers the core functionality of Accurate ECN, AccECN negotiation, AccECN TCP options, and AccECN failure handling. The Accurate ECN draft can be found in https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn-28 This patch series is part of the full AccECN patch series, which is available at https://github.com/L4STeam/linux-net-next/commits/upstream_l4steam/ Best Regards, Chia-Yu --- v14 (22-Jul-2025) - Add missing const for struct tcp_sock of tcp_accecn_option_beacon_check() of #11 (Simon Horman <horms(a)kernel.org>) v13 (18-Jul-2025) - Implement tcp_accecn_extract_syn_ect() and tcp_accecn_reflector_flags() with static array lookup of patch #6 (Paolo Abeni <pabeni(a)redhat.com>) - Fix typos in comments of #6 and remove patch #7 of v12 about simulatenous connect (Paolo Abeni <pabeni(a)redhat.com>) - Move TCP_ACCECN_E1B_INIT_OFFSET, TCP_ACCECN_E0B_INIT_OFFSET, and TCP_ACCECN_CEB_INIT_OFFSET from patch #7 to #11 (Paolo Abeni <pabeni(a)redhat.com>) - Use static array lookup in tcp_accecn_optfield_to_ecnfield() of patch #11 (Paolo Abeni <pabeni(a)redhat.com>) - Return false when WARN_ON_ONCE() is true in tcp_accecn_process_option() of patch #11 (Paolo Abeni <pabeni(a)redhat.com>) - Make synack_ecn_bytes as static const array and use const u32 pointer in tcp_options_write() of #11 (Paolo Abeni <pabeni(a)redhat.com>) - Use ALIGN() and ALIGN_DOWN() in tcp_options_fit_accecn() to pad TCP AccECN option to dword of #11 (Paolo Abeni <pabeni(a)redhat.com>) - Return TCP_ACCECN_OPT_FAIL_SEEN if WARN_ON_ONCE() is true in tcp_accecn_option_init() of #12 (Paolo Abeni <pabeni(a)redhat.com>) v12 (04-Jul-2025) - Fix compilation issues with some intermediate patches in v11 - Add more comments for AccECN helpers of tcp_ecn.h v11 (03-Jul-2025) - Fix compilation issues with some intermediate patches in v10 v10 (02-Jul-2025) - Add new patch of separated header file include/net/tcp_ecn.h to include ECN and AccECN functions (Eric Dumazet <edumazet(a)google.com>) - Add comments on the AccECN helper functions in tcp_ecn.h (Eric Dumazet <edumazet(a)google.com>) - Add documentation of tcp_ecn, tcp_ecn_option, tcp_ecn_beacon in ip-sysctl.rst to the corresponding patch (Eric Dumazet <edumazet(a)google.com>) - Split wait third ACK functionality into a separated patch from AccECN negotiation patch (Eric Dumazet <edumazet(a)google.com>) - Add READ_ONCE() over every reads of sysctl for all patches in the series (Eric Dumazet <edumazet(a)google.com>) - Merge heuristics of AccECN option ceb/cep and ACE field multi-wrap into a single patch - Add a table of SACK block reduction and required AccECN field in patch #15 commit message (Eric Dumazet <edumazet(a)google.com>) v9 (21-Jun-2025) - Use tcp_data_ecn_check() to set TCP_ECN_SEE flag only for RFC3168 ECN (Paolo Abeni <pabeni(a)redhat.com>) - Add comments about setting TCP_ECN_SEEN flag for RFC3168 and Accruate ECN (Paolo Abeni <pabeni(a)redhat.com>) - Restruct the code in the for loop of tcp_accecn_process_option() (Paolo Abeni <pabeni(a)redhat.com>) - Remove ecn_bytes and add use_synack_ecn_bytes flag to identify whether syn_ack_bytes or received_ecn_bytes is used (Paolo Abeni <pabeni(a)redhat.com>) - Replace leftover_bytes and leftover_size with leftover_highbyte and leftover_lowbyte and add comments in tcp_options_write() (Paolo Abeni <pabeni(a)redhat.com>) - Add comments and commit message about the 1st retx SYN still attempt AccECN negotiation (Paolo Abeni <pabeni(a)redhat.com>) v8 (10-Jun-2025) - Add new helper function tcp_ecn_received_counters_payload() in #6 (Paolo Abeni <pabeni(a)redhat.com>) - Set opts->num_sack_blocks=0 to avoid potential undefined value in #8 (Paolo Abeni <pabeni(a)redhat.com>) - Reset leftover_size to 2 once leftover_bytes is used in #9 (Paolo Abeni <pabeni(a)redhat.com>) - Add new helper function tcp_accecn_opt_demand_min() in #10 (Paolo Abeni <pabeni(a)redhat.com>) - Add new helper function tcp_accecn_saw_opt_fail_recv() in #11 (Paolo Abeni <pabeni(a)redhat.com>) - Update tcp_options_fit_accecn() to avoid using recursion in #14 (Paolo Abeni <pabeni(a)redhat.com>) v7 (14-May-2025) - Modify group sizes of tcp_sock_write_txrx and tcp_sock_write_rx in #3 based on pahole results (Paolo Abeni <pabeni(a)redhat.com>) - Fix the issue in #4 and #5 where the RFC3168 ECN behavior in tcp_ecn_send() is changed (Paolo Abeni <pabeni(a)redhat.com>) - Modify group size of tcp_sock_write_txrx in #4 and #6 based on pahole results (Paolo Abeni <pabeni(a)redhat.com>) - Update commit message for #9 to explain the increase in tcp_sock_write_rx group size - Modify group size of tcp_sock_write_tx in #10 based on pahole results v6 (09-May-2025) - Add #3 to utilize exisintg holes of tcp_sock_write_txrx group for later patches (#4, #9, #10) with new u8 members (Paolo Abeni <pabeni(a)redhat.com>) - Add pahole outcomes before and after commit in #4, #5, #6, #9, #10, #15 (Paolo Abeni <pabeni(a)redhat.com>) - Define new helper function tcp_send_ack_reflect_ect() for sending ACK with reflected ECT in #5 (Paolo Abeni <pabeni(a)redhat.com>) - Add comments for function tcp_ecn_rcv_synack() in #5 (Paolo Abeni <pabeni(a)redhat.com>) - Add enum/define to be used by sysctl_tcp_ecn in #5, sysctl_tcp_ecn_option in #9, and sysctl_tcp_ecn_option_beacon in #10 (Paolo Abeni <pabeni(a)redhat.com>) - Move accecn_fail_mode and saw_accecn_opt in #5 and #11 to use exisintg holes of tcp_sock (Paolo Abeni <pabeni(a)redhat.com>) - Change data type of new members of tcp_request_sock and move them to the end of struct in #5 and #11 (Paolo Abeni <pabeni(a)redhat.com>) - Move new members of tcp_info to the end of struct in #6 (Paolo Abeni <pabeni(a)redhat.com>) - Merge previous #7 into #9 (Paolo Abeni <pabeni(a)redhat.com>) - Mask ecnfield with INET_ECN_MASK to remove WARN_ONCE in #9 (Paolo Abeni <pabeni(a)redhat.com>) - Reduce the indentation levels for reabability in #9 and #10 (Paolo Abeni <pabeni(a)redhat.com>) - Move delivered_ecn_bytes to the RX group in #9, accecn_opt_tstamp to the TX group in #10, pkts_acked_ewma to the RX group in #15 (Paolo Abeni <pabeni(a)redhat.com>) - Add changes in Documentation/networking/net_cachelines/tcp_sock.rst for new tcp_sock members in #3, #5, #6, #9, #10, #15 v5 (22-Apr-2025) - Further fix for 32-bit ARM alignment in tcp.c (Simon Horman <horms(a)kernel.org>) v4 (18-Apr-2025) - Fix 32-bit ARM assertion for alignment requirement (Simon Horman <horms(a)kernel.org>) v3 (14-Apr-2025) - Fix patch apply issue in v2 (Jakub Kicinski <kuba(a)kernel.org>) v2 (18-Mar-2025) - Add one missing patch from the previous AccECN protocol preparation patch series to this patch series. --- Chia-Yu Chang (5): tcp: reorganize tcp_sock_write_txrx group for variables later tcp: ecn functions in separated include file tcp: accecn: AccECN option send control tcp: accecn: AccECN option failure handling tcp: accecn: try to fit AccECN option with SACK Ilpo Järvinen (9): tcp: reorganize SYN ECN code tcp: fast path functions later tcp: AccECN core tcp: accecn: AccECN negotiation tcp: accecn: add AccECN rx byte counters tcp: accecn: AccECN needs to know delivered bytes tcp: sack option handling improvements tcp: accecn: AccECN option tcp: accecn: AccECN option ceb/cep and ACE field multi-wrap heuristics Documentation/networking/ip-sysctl.rst | 55 +- .../networking/net_cachelines/tcp_sock.rst | 12 + include/linux/tcp.h | 32 +- include/net/netns/ipv4.h | 2 + include/net/tcp.h | 87 ++- include/net/tcp_ecn.h | 649 ++++++++++++++++++ include/uapi/linux/tcp.h | 7 + net/ipv4/syncookies.c | 4 + net/ipv4/sysctl_net_ipv4.c | 19 + net/ipv4/tcp.c | 28 +- net/ipv4/tcp_input.c | 353 ++++++++-- net/ipv4/tcp_ipv4.c | 8 +- net/ipv4/tcp_minisocks.c | 40 +- net/ipv4/tcp_output.c | 294 ++++++-- net/ipv6/syncookies.c | 2 + net/ipv6/tcp_ipv6.c | 1 + 16 files changed, 1409 insertions(+), 184 deletions(-) create mode 100644 include/net/tcp_ecn.h -- 2.34.1

1 month, 1 week

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[PATCH v20 4/5] binder: add transaction_report feature entry

by Carlos Llamas

From: Li Li <dualli(a)google.com> Add "transaction_report" to the binderfs feature list, to help userspace determine if the "BINDER_CMD_REPORT" generic netlink api is supported by the binder driver. Signed-off-by: Li Li <dualli(a)google.com> Signed-off-by: Carlos Llamas <cmllamas(a)google.com> --- drivers/android/binderfs.c | 8 ++++++++ .../selftests/filesystems/binderfs/binderfs_test.c | 1 + 2 files changed, 9 insertions(+) diff --git a/drivers/android/binderfs.c b/drivers/android/binderfs.c index 4f827152d18e..f74a7e380261 100644 --- a/drivers/android/binderfs.c +++ b/drivers/android/binderfs.c @@ -59,6 +59,7 @@ struct binder_features { bool oneway_spam_detection; bool extended_error; bool freeze_notification; + bool transaction_report; }; static const struct constant_table binderfs_param_stats[] = { @@ -76,6 +77,7 @@ static struct binder_features binder_features = { .oneway_spam_detection = true, .extended_error = true, .freeze_notification = true, + .transaction_report = true, }; static inline struct binderfs_info *BINDERFS_SB(const struct super_block *sb) @@ -616,6 +618,12 @@ static int init_binder_features(struct super_block *sb) if (IS_ERR(dentry)) return PTR_ERR(dentry); + dentry = binderfs_create_file(dir, "transaction_report", + &binder_features_fops, + &binder_features.transaction_report); + if (IS_ERR(dentry)) + return PTR_ERR(dentry); + return 0; } diff --git a/tools/testing/selftests/filesystems/binderfs/binderfs_test.c b/tools/testing/selftests/filesystems/binderfs/binderfs_test.c index 81db85a5cc16..39a68078a79b 100644 --- a/tools/testing/selftests/filesystems/binderfs/binderfs_test.c +++ b/tools/testing/selftests/filesystems/binderfs/binderfs_test.c @@ -65,6 +65,7 @@ static int __do_binderfs_test(struct __test_metadata *_metadata) "oneway_spam_detection", "extended_error", "freeze_notification", + "transaction_report", }; change_mountns(_metadata); -- 2.50.1.470.g6ba607880d-goog

1 month, 1 week

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[PATCH net-next] selftests: bpf: fix legacy netfilter options

by Jakub Kicinski

Recent commit to add NETFILTER_XTABLES_LEGACY missed setting a couple of configs to y. They are still enabled but as modules which appears to have upset BPF CI, e.g.: test_bpf_nf_ct:FAIL:iptables-legacy -t raw -A PREROUTING -j CONNMARK --set-mark 42/0 unexpected error: 768 (errno 0) Fixes: 3c3ab65f00eb ("selftests: net: Enable legacy netfilter legacy options.") Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> --- Targeting net-next 'cause that's where the bad commit is. CC: ast(a)kernel.org CC: daniel(a)iogearbox.net CC: andrii(a)kernel.org CC: martin.lau(a)linux.dev CC: eddyz87(a)gmail.com CC: song(a)kernel.org CC: yonghong.song(a)linux.dev CC: john.fastabend(a)gmail.com CC: kpsingh(a)kernel.org CC: sdf(a)fomichev.me CC: haoluo(a)google.com CC: jolsa(a)kernel.org CC: mykolal(a)fb.com CC: shuah(a)kernel.org CC: pablo(a)netfilter.org CC: bigeasy(a)linutronix.de CC: fw(a)strlen.de CC: bpf(a)vger.kernel.org CC: linux-kselftest(a)vger.kernel.org --- tools/testing/selftests/bpf/config | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/testing/selftests/bpf/config b/tools/testing/selftests/bpf/config index 521836776733..e8c6c77b96cb 100644 --- a/tools/testing/selftests/bpf/config +++ b/tools/testing/selftests/bpf/config @@ -97,6 +97,8 @@ CONFIG_NF_TABLES_NETDEV=y CONFIG_NF_TABLES_IPV4=y CONFIG_NF_TABLES_IPV6=y CONFIG_NETFILTER_INGRESS=y +CONFIG_IP_NF_IPTABLES_LEGACY=y +CONFIG_IP6_NF_IPTABLES_LEGACY=y CONFIG_NETFILTER_XTABLES_LEGACY=y CONFIG_NF_FLOW_TABLE=y CONFIG_NF_FLOW_TABLE_INET=y -- 2.50.1

1 month, 2 weeks

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[PATCH net v2] selftests: rtnetlink.sh: remove esp4_offload after test

by Xiumei Mu

The esp4_offload module, loaded during IPsec offload tests, should be reset to its default settings after testing. Otherwise, leaving it enabled could unintentionally affect subsequence test cases by keeping offload active. Without this fix: $ lsmod | grep offload; ./rtnetlink.sh -t kci_test_ipsec_offload ; lsmod | grep offload; PASS: ipsec_offload esp4_offload 12288 0 esp4 32768 1 esp4_offload With this fix: $ lsmod | grep offload; ./rtnetlink.sh -t kci_test_ipsec_offload ; lsmod | grep offload; PASS: ipsec_offload Fixes: 2766a11161cc ("selftests: rtnetlink: add ipsec offload API test") Signed-off-by: Xiumei Mu <xmu(a)redhat.com> Reviewed-by: Shannon Nelson <sln(a)onemain.com> --- Changes in v2: - add test results in description - Enhanced logic for rmmod esp4_offload - fix shellcheck warning: SC2086 (The quoting issue) --- --- tools/testing/selftests/net/rtnetlink.sh | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/testing/selftests/net/rtnetlink.sh b/tools/testing/selftests/net/rtnetlink.sh index 2e8243a65b50..d2298da320a6 100755 --- a/tools/testing/selftests/net/rtnetlink.sh +++ b/tools/testing/selftests/net/rtnetlink.sh @@ -673,6 +673,11 @@ kci_test_ipsec_offload() sysfsf=$sysfsd/ipsec sysfsnet=/sys/bus/netdevsim/devices/netdevsim0/net/ probed=false + esp4_offload_probed_default=false + + if lsmod | grep -q esp4_offload; then + esp4_offload_probed_default=true + fi if ! mount | grep -q debugfs; then mount -t debugfs none /sys/kernel/debug/ &> /dev/null @@ -766,6 +771,7 @@ EOF fi # clean up any leftovers + ! "$esp4_offload_probed_default" && lsmod | grep -q esp4_offload && rmmod esp4_offload echo 0 > /sys/bus/netdevsim/del_device $probed && rmmod netdevsim -- 2.50.1

1 month, 2 weeks

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[PATCH -next] selftests/ftrace: Prevent potential failure in subsystem-enable test case

by Tengda Wu

The first 100 lines of trace output don't always contain 3 or more distinct events. In busy systems, they may be dominated by repetitive events like sched_stat_runtime, causing the `$count -lt 3` check to fail. Example trace: $ head -n 100 trace | grep -v ^# systemd-timesyn-266 [006] d.h2. 738.778482: sched_stat_runtime: comm=systemd-timesyn pid=266 runtime=976854 [ns] ftracetest-8751 [001] d.h2. 738.778512: sched_stat_runtime: comm=ftracetest pid=8751 runtime=938335 [ns] systemd-timesyn-266 [006] d.h1. 738.779531: sched_stat_runtime: comm=systemd-timesyn pid=266 runtime=1044284 [ns] ftracetest-8751 [001] d.h2. 738.779541: sched_stat_runtime: comm=ftracetest pid=8751 runtime=1028575 [ns] systemd-1 [007] d.h5. 738.779657: sched_stat_runtime: comm=systemd pid=1 runtime=642624 [ns] [...] With trace cleared, simply check `$count -eq 0` to confirm subsystem enablement, just like toplevel-enable.tc does. Fixes: 1a4ea83a6e67 ("selftests/ftrace: Limit length in subsystem-enable tests") Signed-off-by: Tengda Wu <wutengda(a)huaweicloud.com> --- .../selftests/ftrace/test.d/event/subsystem-enable.tc | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc b/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc index b7c8f29c09a9..3a28adc7b727 100644 --- a/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc +++ b/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc @@ -19,8 +19,8 @@ echo 'sched:*' > set_event yield count=`head -n 100 trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l` -if [ $count -lt 3 ]; then - fail "at least fork, exec and exit events should be recorded" +if [ $count -eq 0 ]; then + fail "none of scheduler events are recorded" fi do_reset @@ -30,8 +30,8 @@ echo 1 > events/sched/enable yield count=`head -n 100 trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l` -if [ $count -lt 3 ]; then - fail "at least fork, exec and exit events should be recorded" +if [ $count -eq 0 ]; then + fail "none of scheduler events are recorded" fi do_reset -- 2.34.1

1 month, 2 weeks

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[PATCH net v2] selftests: netfilter: ipvs.sh: Explicity disable rp_filter on interface tunl0

by Yi Chen

Although setup_ns() set net.ipv4.conf.default.rp_filter=0, loading certain module such as ipip will automatically create a tunl0 interface in all netns including new created ones. In the script, this is before than default.rp_filter=0 applied, as a result tunl0.rp_filter remains set to 1 which causes the test report FAIL when ipip module is preloaded. Before fix: Testing DR mode... Testing NAT mode... Testing Tunnel mode... ipvs.sh: FAIL After fix: Testing DR mode... Testing NAT mode... Testing Tunnel mode... ipvs.sh: PASS Fixes: 7c8b89ec506e ("selftests: netfilter: remove rp_filter configuration") v2: Fixed the format of Fixes tag. Signed-off-by: Yi Chen <yiche(a)redhat.com> --- tools/testing/selftests/net/netfilter/ipvs.sh | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/net/netfilter/ipvs.sh b/tools/testing/selftests/net/netfilter/ipvs.sh index 6af2ea3ad6b8..9c9d5b38ab71 100755 --- a/tools/testing/selftests/net/netfilter/ipvs.sh +++ b/tools/testing/selftests/net/netfilter/ipvs.sh @@ -151,7 +151,7 @@ test_nat() { test_tun() { ip netns exec "${ns0}" ip route add "${vip_v4}" via "${gip_v4}" dev br0 - ip netns exec "${ns1}" modprobe -q ipip + modprobe -q ipip ip netns exec "${ns1}" ip link set tunl0 up ip netns exec "${ns1}" sysctl -qw net.ipv4.ip_forward=0 ip netns exec "${ns1}" sysctl -qw net.ipv4.conf.all.send_redirects=0 @@ -160,10 +160,10 @@ test_tun() { ip netns exec "${ns1}" ipvsadm -a -i -t "${vip_v4}:${port}" -r ${rip_v4}:${port} ip netns exec "${ns1}" ip addr add ${vip_v4}/32 dev lo:1 - ip netns exec "${ns2}" modprobe -q ipip ip netns exec "${ns2}" ip link set tunl0 up ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.all.arp_ignore=1 ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.all.arp_announce=2 + ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.tunl0.rp_filter=0 ip netns exec "${ns2}" ip addr add "${vip_v4}/32" dev lo:1 test_service -- 2.50.1

1 month, 2 weeks

2
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[PATCH net-next] selftests: drv-net: Wait for bkg socat to start

by Mohsin Bashir

Currently, UDP exchange is prone to failure when cmd attempt to send data while socat in bkg is not ready. Since, the behavior is probabilistic, this can result in flakiness for XDP tests. While testing test_xdp_native_tx_mb() on netdevsim, a failure rate of around 1% in 500 500 iterations was observed. Use wait_port_listen() to ensure that the bkg socat is started and ready to receive before cmd start sending. With proposed changes, a re-run of the same test passed 100% of time. Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> Signed-off-by: Mohsin Bashir <mohsin.bashr(a)gmail.com> --- tools/testing/selftests/drivers/net/xdp.py | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/drivers/net/xdp.py b/tools/testing/selftests/drivers/net/xdp.py index 887d662ad128..1dd8bf3bf6c9 100755 --- a/tools/testing/selftests/drivers/net/xdp.py +++ b/tools/testing/selftests/drivers/net/xdp.py @@ -13,7 +13,7 @@ from enum import Enum from lib.py import ksft_run, ksft_exit, ksft_eq, ksft_ne, ksft_pr from lib.py import KsftFailEx, NetDrvEpEnv, EthtoolFamily, NlError -from lib.py import bkg, cmd, rand_port +from lib.py import bkg, cmd, rand_port, wait_port_listen from lib.py import ip, bpftool, defer @@ -70,6 +70,7 @@ def _exchg_udp(cfg, port, test_string): tx_udp_cmd = f"echo -n {test_string} | socat -t 2 -u STDIN UDP:{cfg.baddr}:{port}" with bkg(rx_udp_cmd, exit_wait=True) as nc: + wait_port_listen(port, proto="udp") cmd(tx_udp_cmd, host=cfg.remote, shell=True) return nc.stdout.strip() @@ -310,6 +311,7 @@ def test_xdp_native_tx_mb(cfg): tx_udp = f"echo {test_string} | socat -t 2 -u STDIN UDP:{cfg.baddr}:{port}" with bkg(rx_udp, host=cfg.remote, exit_wait=True) as rnc: + wait_port_listen(port, proto="udp", host=cfg.remote) cmd(tx_udp, host=cfg.remote, shell=True) stats = _get_stats(prog_info['maps']['map_xdp_stats']) -- 2.47.3

1 month, 2 weeks

2
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[PATCH net-next v7] ipv6: add `force_forwarding` sysctl to enable per-interface forwarding

by Gabriel Goller

It is currently impossible to enable ipv6 forwarding on a per-interface basis like in ipv4. To enable forwarding on an ipv6 interface we need to enable it on all interfaces and disable it on the other interfaces using a netfilter rule. This is especially cumbersome if you have lots of interfaces and only want to enable forwarding on a few. According to the sysctl docs [0] the `net.ipv6.conf.all.forwarding` enables forwarding for all interfaces, while the interface-specific `net.ipv6.conf.<interface>.forwarding` configures the interface Host/Router configuration. Introduce a new sysctl flag `force_forwarding`, which can be set on every interface. The ip6_forwarding function will then check if the global forwarding flag OR the force_forwarding flag is active and forward the packet. To preserve backwards-compatibility reset the flag (on all interfaces) to 0 if the net.ipv6.conf.all.forwarding flag is set to 0. Add a short selftest that checks if a packet gets forwarded with and without `force_forwarding`. [0]: https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt Acked-by: Nicolas Dichtel <nicolas.dichtel(a)6wind.com> Signed-off-by: Gabriel Goller <g.goller(a)proxmox.com> --- v7: * rebase * fix typos in commit message v6: https://lore.kernel.org/netdev/20250711124243.526735-1-g.goller@proxmox.com/ * rebase * remove brackets around single line * add 'nodad' to addresses in selftest to avoid sporadic failures v5: https://lore.kernel.org/netdev/20250707094307.223975-1-g.goller@proxmox.com/ * update conf/all/forwarding docs * simplified backwards-compat comment * remove ASSERT_RTNL as it's guaranteed by __in6_dev_get_rtnl_net() already * cange ip6_forward logic so that it doesn't depend on the idev existing * move WRITE_ONCE inside device lock v4: https://lore.kernel.org/netdev/20250703160154.560239-1-g.goller@proxmox.com/ * actually write the sysctl value to the table * use ASSERT_RTNL() when forwarding the sysctl change * remove useless comments in function body * simplify forwarding and force_forwarding check in ip6_output.c * fix code backticks in Documentation (double instead of single) * add selftests v3: https://lore.kernel.org/netdev/20250702074619.139031-1-g.goller@proxmox.com/ * remove forwarding=0 setting force_forwarding=0 globally. * add min and max (0 and 1) value to sysctl. v2: https://lore.kernel.org/netdev/20250701140423.487411-1-g.goller@proxmox.com/ * rename from `do_forwarding` to `force_forwarding`. * add global `force_forwarding` flag which will enable `force_forwarding` on every interface like the `ipv4.all.forwarding` flag. * `forwarding`=0 will disable global and per-interface `force_forwarding`. * export option as NETCONFA_FORCE_FORWARDING. v1: https://lore.kernel.org/netdev/20250702074619.139031-1-g.goller@proxmox.com/ Documentation/networking/ip-sysctl.rst | 8 +- include/linux/ipv6.h | 1 + include/uapi/linux/ipv6.h | 1 + include/uapi/linux/netconf.h | 1 + include/uapi/linux/sysctl.h | 1 + net/ipv6/addrconf.c | 82 ++++++++++++++ net/ipv6/ip6_output.c | 3 +- tools/testing/selftests/net/Makefile | 1 + .../selftests/net/ipv6_force_forwarding.sh | 105 ++++++++++++++++++ 9 files changed, 200 insertions(+), 3 deletions(-) create mode 100755 tools/testing/selftests/net/ipv6_force_forwarding.sh diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst index 14700ea77e75..bb620f554598 100644 --- a/Documentation/networking/ip-sysctl.rst +++ b/Documentation/networking/ip-sysctl.rst @@ -2543,8 +2543,8 @@ conf/all/disable_ipv6 - BOOLEAN conf/all/forwarding - BOOLEAN Enable global IPv6 forwarding between all interfaces. - IPv4 and IPv6 work differently here; e.g. netfilter must be used - to control which interfaces may forward packets and which not. + IPv4 and IPv6 work differently here; the ``force_forwarding`` flag must + be used to control which interfaces may forward packets. This also sets all interfaces' Host/Router setting 'forwarding' to the specified value. See below for details. @@ -2561,6 +2561,10 @@ proxy_ndp - BOOLEAN Default: 0 (disabled) +force_forwarding - BOOLEAN + Enable forwarding on this interface only -- regardless of the setting on + ``conf/all/forwarding``. When setting ``conf.all.forwarding`` to 0, + the ``force_forwarding`` flag will be reset on all interfaces. fwmark_reflect - BOOLEAN Controls the fwmark of kernel-generated IPv6 reply packets that are not diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h index db0eb0d86b64..bc6ec2959173 100644 --- a/include/linux/ipv6.h +++ b/include/linux/ipv6.h @@ -17,6 +17,7 @@ struct ipv6_devconf { __s32 hop_limit; __s32 mtu6; __s32 forwarding; + __s32 force_forwarding; __s32 disable_policy; __s32 proxy_ndp; __cacheline_group_end(ipv6_devconf_read_txrx); diff --git a/include/uapi/linux/ipv6.h b/include/uapi/linux/ipv6.h index cf592d7b630f..d4d3ae774b26 100644 --- a/include/uapi/linux/ipv6.h +++ b/include/uapi/linux/ipv6.h @@ -199,6 +199,7 @@ enum { DEVCONF_NDISC_EVICT_NOCARRIER, DEVCONF_ACCEPT_UNTRACKED_NA, DEVCONF_ACCEPT_RA_MIN_LFT, + DEVCONF_FORCE_FORWARDING, DEVCONF_MAX }; diff --git a/include/uapi/linux/netconf.h b/include/uapi/linux/netconf.h index fac4edd55379..1c8c84d65ae3 100644 --- a/include/uapi/linux/netconf.h +++ b/include/uapi/linux/netconf.h @@ -19,6 +19,7 @@ enum { NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, NETCONFA_INPUT, NETCONFA_BC_FORWARDING, + NETCONFA_FORCE_FORWARDING, __NETCONFA_MAX }; #define NETCONFA_MAX (__NETCONFA_MAX - 1) diff --git a/include/uapi/linux/sysctl.h b/include/uapi/linux/sysctl.h index 8981f00204db..63d1464cb71c 100644 --- a/include/uapi/linux/sysctl.h +++ b/include/uapi/linux/sysctl.h @@ -573,6 +573,7 @@ enum { NET_IPV6_ACCEPT_RA_FROM_LOCAL=26, NET_IPV6_ACCEPT_RA_RT_INFO_MIN_PLEN=27, NET_IPV6_RA_DEFRTR_METRIC=28, + NET_IPV6_FORCE_FORWARDING=29, __NET_IPV6_MAX }; diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 4f1d7d110302..81a067a2e526 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -239,6 +239,7 @@ static struct ipv6_devconf ipv6_devconf __read_mostly = { .ndisc_evict_nocarrier = 1, .ra_honor_pio_life = 0, .ra_honor_pio_pflag = 0, + .force_forwarding = 0, }; static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { @@ -303,6 +304,7 @@ static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { .ndisc_evict_nocarrier = 1, .ra_honor_pio_life = 0, .ra_honor_pio_pflag = 0, + .force_forwarding = 0, }; /* Check if link is ready: is it up and is a valid qdisc available */ @@ -857,6 +859,9 @@ static void addrconf_forward_change(struct net *net, __s32 newf) idev = __in6_dev_get_rtnl_net(dev); if (idev) { int changed = (!idev->cnf.forwarding) ^ (!newf); + /* Disabling all.forwarding sets 0 to force_forwarding for all interfaces */ + if (newf == 0) + WRITE_ONCE(idev->cnf.force_forwarding, 0); WRITE_ONCE(idev->cnf.forwarding, newf); if (changed) @@ -5710,6 +5715,7 @@ static void ipv6_store_devconf(const struct ipv6_devconf *cnf, array[DEVCONF_ACCEPT_UNTRACKED_NA] = READ_ONCE(cnf->accept_untracked_na); array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft); + array[DEVCONF_FORCE_FORWARDING] = READ_ONCE(cnf->force_forwarding); } static inline size_t inet6_ifla6_size(void) @@ -6738,6 +6744,75 @@ static int addrconf_sysctl_disable_policy(const struct ctl_table *ctl, int write return ret; } +static void addrconf_force_forward_change(struct net *net, __s32 newf) +{ + struct net_device *dev; + struct inet6_dev *idev; + + for_each_netdev(net, dev) { + idev = __in6_dev_get_rtnl_net(dev); + if (idev) { + int changed = (!idev->cnf.force_forwarding) ^ (!newf); + + WRITE_ONCE(idev->cnf.force_forwarding, newf); + if (changed) + inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, + NETCONFA_FORCE_FORWARDING, + dev->ifindex, &idev->cnf); + } + } +} + +static int addrconf_sysctl_force_forwarding(const struct ctl_table *ctl, int write, + void *buffer, size_t *lenp, loff_t *ppos) +{ + struct inet6_dev *idev = ctl->extra1; + struct ctl_table tmp_ctl = *ctl; + struct net *net = ctl->extra2; + int *valp = ctl->data; + int new_val = *valp; + int old_val = *valp; + loff_t pos = *ppos; + int ret; + + tmp_ctl.extra1 = SYSCTL_ZERO; + tmp_ctl.extra2 = SYSCTL_ONE; + tmp_ctl.data = &new_val; + + ret = proc_douintvec_minmax(&tmp_ctl, write, buffer, lenp, ppos); + + if (write && old_val != new_val) { + if (!rtnl_net_trylock(net)) + return restart_syscall(); + + WRITE_ONCE(*valp, new_val); + + if (valp == &net->ipv6.devconf_dflt->force_forwarding) { + inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, + NETCONFA_FORCE_FORWARDING, + NETCONFA_IFINDEX_DEFAULT, + net->ipv6.devconf_dflt); + } else if (valp == &net->ipv6.devconf_all->force_forwarding) { + inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, + NETCONFA_FORCE_FORWARDING, + NETCONFA_IFINDEX_ALL, + net->ipv6.devconf_all); + + addrconf_force_forward_change(net, new_val); + } else { + inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, + NETCONFA_FORCE_FORWARDING, + idev->dev->ifindex, + &idev->cnf); + } + rtnl_net_unlock(net); + } + + if (ret) + *ppos = pos; + return ret; +} + static int minus_one = -1; static const int two_five_five = 255; static u32 ioam6_if_id_max = U16_MAX; @@ -7208,6 +7283,13 @@ static const struct ctl_table addrconf_sysctl[] = { .extra1 = SYSCTL_ZERO, .extra2 = SYSCTL_TWO, }, + { + .procname = "force_forwarding", + .data = &ipv6_devconf.force_forwarding, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = addrconf_sysctl_force_forwarding, + }, }; static int __addrconf_sysctl_register(struct net *net, char *dev_name, diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 0412f8544695..1e1410237b6e 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -511,7 +511,8 @@ int ip6_forward(struct sk_buff *skb) u32 mtu; idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif)); - if (READ_ONCE(net->ipv6.devconf_all->forwarding) == 0) + if (!READ_ONCE(net->ipv6.devconf_all->forwarding) && + (!idev || !READ_ONCE(idev->cnf.force_forwarding))) goto error; if (skb->pkt_type != PACKET_HOST) diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile index 13e2678d418b..b31a71f2b372 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -116,6 +116,7 @@ TEST_GEN_FILES += skf_net_off TEST_GEN_FILES += tfo TEST_PROGS += tfo_passive.sh TEST_PROGS += broadcast_pmtu.sh +TEST_PROGS += ipv6_force_forwarding.sh # YNL files, must be before "include ..lib.mk" YNL_GEN_FILES := busy_poller netlink-dumps diff --git a/tools/testing/selftests/net/ipv6_force_forwarding.sh b/tools/testing/selftests/net/ipv6_force_forwarding.sh new file mode 100755 index 000000000000..bf0243366caa --- /dev/null +++ b/tools/testing/selftests/net/ipv6_force_forwarding.sh @@ -0,0 +1,105 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# Test IPv6 force_forwarding interface property +# +# This test verifies that the force_forwarding property works correctly: +# - When global forwarding is disabled, packets are not forwarded normally +# - When force_forwarding is enabled on an interface, packets are forwarded +# regardless of the global forwarding setting + +source lib.sh + +cleanup() { + cleanup_ns $ns1 $ns2 $ns3 +} + +trap cleanup EXIT + +setup_test() { + # Create three namespaces: sender, router, receiver + setup_ns ns1 ns2 ns3 + + # Create veth pairs: ns1 <-> ns2 <-> ns3 + ip link add name veth12 type veth peer name veth21 + ip link add name veth23 type veth peer name veth32 + + # Move interfaces to namespaces + ip link set veth12 netns $ns1 + ip link set veth21 netns $ns2 + ip link set veth23 netns $ns2 + ip link set veth32 netns $ns3 + + # Configure interfaces + ip -n $ns1 addr add 2001:db8:1::1/64 dev veth12 nodad + ip -n $ns2 addr add 2001:db8:1::2/64 dev veth21 nodad + ip -n $ns2 addr add 2001:db8:2::1/64 dev veth23 nodad + ip -n $ns3 addr add 2001:db8:2::2/64 dev veth32 nodad + + # Bring up interfaces + ip -n $ns1 link set veth12 up + ip -n $ns2 link set veth21 up + ip -n $ns2 link set veth23 up + ip -n $ns3 link set veth32 up + + # Add routes + ip -n $ns1 route add 2001:db8:2::/64 via 2001:db8:1::2 + ip -n $ns3 route add 2001:db8:1::/64 via 2001:db8:2::1 + + # Disable global forwarding + ip netns exec $ns2 sysctl -qw net.ipv6.conf.all.forwarding=0 +} + +test_force_forwarding() { + local ret=0 + + echo "TEST: force_forwarding functionality" + + # Check if force_forwarding sysctl exists + if ! ip netns exec $ns2 test -f /proc/sys/net/ipv6/conf/veth21/force_forwarding; then + echo "SKIP: force_forwarding not available" + return $ksft_skip + fi + + # Test 1: Without force_forwarding, ping should fail + ip netns exec $ns2 sysctl -qw net.ipv6.conf.veth21.force_forwarding=0 + ip netns exec $ns2 sysctl -qw net.ipv6.conf.veth23.force_forwarding=0 + + if ip netns exec $ns1 ping -6 -c 1 -W 2 2001:db8:2::2 &>/dev/null; then + echo "FAIL: ping succeeded when forwarding disabled" + ret=1 + else + echo "PASS: forwarding disabled correctly" + fi + + # Test 2: With force_forwarding enabled, ping should succeed + ip netns exec $ns2 sysctl -qw net.ipv6.conf.veth21.force_forwarding=1 + ip netns exec $ns2 sysctl -qw net.ipv6.conf.veth23.force_forwarding=1 + + if ip netns exec $ns1 ping -6 -c 1 -W 2 2001:db8:2::2 &>/dev/null; then + echo "PASS: force_forwarding enabled forwarding" + else + echo "FAIL: ping failed with force_forwarding enabled" + ret=1 + fi + + return $ret +} + +echo "IPv6 force_forwarding test" +echo "==========================" + +setup_test +test_force_forwarding +ret=$? + +if [ $ret -eq 0 ]; then + echo "OK" + exit 0 +elif [ $ret -eq $ksft_skip ]; then + echo "SKIP" + exit $ksft_skip +else + echo "FAIL" + exit 1 +fi -- 2.39.5

1 month, 2 weeks

2
1
0 0

[PATCH net-next] selftests: net: Skip test if IPv6 is not configured

by Breno Leitao

Extend the `check_for_dependencies()` function in `lib_netcons.sh` to check whether IPv6 is enabled by verifying the existence of `/proc/net/if_inet6`. Having IPv6 is a now a dependency of netconsole tests. If the file does not exist, the script will skip the test with an appropriate message suggesting to verify if `CONFIG_IPV6` is enabled. This prevents the test to misbehave if IPv6 is not configured. Signed-off-by: Breno Leitao <leitao(a)debian.org> --- tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh b/tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh index 258af805497b4..b6071e80ebbb6 100644 --- a/tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh +++ b/tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh @@ -281,6 +281,11 @@ function check_for_dependencies() { exit "${ksft_skip}" fi + if [ ! -f /proc/net/if_inet6 ]; then + echo "SKIP: IPv6 not configured. Check if CONFIG_IPV6 is enabled" >&2 + exit "${ksft_skip}" + fi + if [ ! -f "${NSIM_DEV_SYS_NEW}" ]; then echo "SKIP: file ${NSIM_DEV_SYS_NEW} does not exist. Check if CONFIG_NETDEVSIM is enabled" >&2 exit "${ksft_skip}" --- base-commit: dd500e4aecf25e48e874ca7628697969df679493 change-id: 20250723-netcons_test_ipv6-15b1b76bb231 Best regards, -- Breno Leitao <leitao(a)debian.org>

1 month, 2 weeks

5
7
0 0

[PATCH v3 00/10] mm/mremap: permit mremap() move of multiple VMAs

by Lorenzo Stoakes

Historically we've made it a uAPI requirement that mremap() may only operate on a single VMA at a time. For instances where VMAs need to be resized, this makes sense, as it becomes very difficult to determine what a user actually wants should they indicate a desire to expand or shrink the size of multiple VMAs (truncate? Adjust sizes individually? Some other strategy?). However, in instances where a user is moving VMAs, it is restrictive to disallow this. This is especially the case when anonymous mapping remap may or may not be mergeable depending on whether VMAs have or have not been faulted due to anon_vma assignment and folio index alignment with vma->vm_pgoff. Often this can result in surprising impact where a moved region is faulted, then moved back and a user fails to observe a merge from otherwise compatible, adjacent VMAs. This change allows such cases to work without the user having to be cognizant of whether a prior mremap() move or other VMA operations has resulted in VMA fragmentation. In order to do this, this series performs a large amount of refactoring, most pertinently - grouping sanity checks together, separately those that check input parameters and those relating to VMAs. we also simplify the post-mmap lock drop processing for uffd and mlock()'d VMAs. With this done, we can then fairly straightforwardly implement this functionality. This works exclusively for mremap() invocations which specify MREMAP_FIXED. It is not compatible with VMAs which use userfaultfd, as the notification of the userland fault handler would require us to drop the mmap lock. It is also not compatible with file-backed mappings with customised get_unmapped_area() handlers as these may not honour MREMAP_FIXED. The input and output addresses ranges must not overlap. We carefully account for moves which would result in VMA iterator invalidation. While there can be gaps between VMAs in the input range, there can be no gap before the first VMA in the range. v3: * Disallowed move operation except for MREMAP_FIXED. * Disallow gap at start of aggregate range to avoid confusion. * Disallow any file-baked VMAs with custom get_unmapped_area. * Renamed multi_vma to seen_vma to be clearer. Stop reusing new_addr, use separate target_addr var to track next target address. * Check if first VMA fails multi VMA check, if so we'll allow one VMA but not multiple. * Updated the commit message for patch 9 to be clearer about gap behaviour. * Removed accidentally included debug goto statement in test (doh!). Test was and is passing regardless. * Unmap target range in test, previously we ended up moving additional VMAs unintentionally. This still all passed :) but was not what was intended. * Removed self-merge check - there is absolutely no way this can happen across multiple VMAs, as there is no means of moving VMAs such that a VMA merges with itself. v2: * Squashed uffd stub fix into series. * Propagated tags, thanks! * Fixed param naming in patch 4 as per Vlastimil. * Renamed vma_reset to vmi_needs_reset + dropped reset on unmap as per Liam. * Correctly return -EFAULT if no VMAs in input range. * Account for get_unmapped_area() disregarding MAP_FIXED and returning an altered address. * Added additional explanatatory comment to the remap_move() function. https://lore.kernel.org/all/cover.1751865330.git.lorenzo.stoakes@oracle.com/ v1: https://lore.kernel.org/all/cover.1751865330.git.lorenzo.stoakes@oracle.com/ Lorenzo Stoakes (10): mm/mremap: perform some simple cleanups mm/mremap: refactor initial parameter sanity checks mm/mremap: put VMA check and prep logic into helper function mm/mremap: cleanup post-processing stage of mremap mm/mremap: use an explicit uffd failure path for mremap mm/mremap: check remap conditions earlier mm/mremap: move remap_is_valid() into check_prep_vma() mm/mremap: clean up mlock populate behaviour mm/mremap: permit mremap() move of multiple VMAs tools/testing/selftests: extend mremap_test to test multi-VMA mremap fs/userfaultfd.c | 15 +- include/linux/userfaultfd_k.h | 5 + mm/mremap.c | 553 +++++++++++++++-------- tools/testing/selftests/mm/mremap_test.c | 146 +++++- 4 files changed, 518 insertions(+), 201 deletions(-) -- 2.50.0

1 month, 2 weeks

3
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