Merge pull request #14303 from yuwata/tc-use-typesafe-functions

network: tc: use typesafe functions

docs/AUTOMATIC_BOOT_ASSESSMENT.md

@@ -1,5 +1,6 @@
 ---
 title: Automatic Boot Assessment
+category: Booting
 ---
 
 # Automatic Boot Assessment

docs/BLOCK_DEVICE_LOCKING.md

@@ -1,5 +1,6 @@
 ---
 title: Locking Block Device Access
+category: Interfaces
 ---
 
 # Locking Block Device Access

docs/BOOT_LOADER_INTERFACE.md

@@ -1,5 +1,6 @@
 ---
 title: The Boot Loader Interface
+category: Booting
 ---
 
 # The Boot Loader Interface

docs/BOOT_LOADER_SPECIFICATION.md

@@ -1,5 +1,6 @@
 ---
 title: The Boot Loader Specification
+category: Booting
 ---
 
 # The Boot Loader Specification

docs/CGROUP_DELEGATION.md

@@ -1,5 +1,6 @@
 ---
 title: Control Group APIs and Delegation
+category: Interfaces
 ---
 
 # Control Group APIs and Delegation

docs/CODE_OF_CONDUCT.md

@@ -1,5 +1,6 @@
 ---
 title: The systemd Community Conduct Guidelines
+category: Contributing
 ---
 
 # The systemd Community Conduct Guidelines

docs/CODE_QUALITY.md

@@ -1,5 +1,6 @@
 ---
 title: Code Quality Tools
+category: Contributing
 ---
 
 # Code Quality Tools

docs/CODING_STYLE.md

@@ -1,5 +1,6 @@
 ---
 title: Coding Style
+category: Contributing
 ---
 
 # Coding Style

docs/CONTRIBUTING.md

@@ -1,5 +1,6 @@
 ---
 title: Contributing
+category: Contributing
 ---
 
 # Contributing

docs/DISTRO_PORTING.md

@@ -1,5 +1,6 @@
 ---
 title: Porting systemd To New Distributions
+category: Concepts
 ---
 
 # Porting systemd To New Distributions

docs/ENVIRONMENT.md

@@ -1,5 +1,6 @@
 ---
 title: Known Environment Variables
+category: Interfaces
 ---
 
 # Known Environment Variables

docs/HACKING.md

@@ -1,5 +1,6 @@
 ---
 title: Hacking on systemd
+category: Contributing
 ---
 
 # Hacking on systemd

docs/PORTABLE_SERVICES.md

@@ -1,5 +1,6 @@
 ---
 title: Portable Services Introduction
+category: Concepts
 ---
 
 # Portable Services Introduction

docs/PREDICTABLE_INTERFACE_NAMES.md

@@ -1,5 +1,6 @@
 ---
 title: Predictable Network Interface Names
+category: Concepts
 ---
 
 # Predictable Network Interface Names

docs/RANDOM_SEEDS.md

@@ -1,5 +1,6 @@
 ---
 title: Random Seeds
+category: Concepts
 ---
 
 # Random Seeds

docs/RELEASE.md

@@ -1,5 +1,6 @@
 ---
 title: Steps to a Successful Release
+category: Contributing
 ---
 
 # Steps to a Successful Release

docs/SECURITY.md

@@ -1,5 +1,6 @@
 ---
 title: Reporting of security vulnerabilities
+category: Contributing
 ---
 
 # Reporting of security vulnerabilities

docs/TEMPORARY_DIRECTORIES.md

@@ -1,5 +1,6 @@
 ---
 title: Using /tmp/ And /var/tmp/ Safely
+category: Interfaces
 ---
 
 # Using `/tmp/` And `/var/tmp/` Safely

docs/TESTING_WITH_SANITIZERS.md

@@ -1,5 +1,6 @@
 ---
 title: Testing systemd using sanitizers
+category: Contributing
 ---
 
 # Testing systemd using sanitizers

docs/TRANSIENT-SETTINGS.md

@@ -1,5 +1,6 @@
 ---
 title: What settings are currently available for transient units?
+category: Interfaces
 ---
 
 # What settings are currently available for transient units?

docs/TRANSLATORS.md

@@ -1,5 +1,6 @@
 ---
 title: Notes for Translators
+category: Contributing
 ---
 
 # Notes for Translators

docs/UIDS-GIDS.md

@@ -1,5 +1,6 @@
 ---
 title: Users, Groups, UIDs and GIDs on `systemd` Systems
+category: Concepts
 ---
 
 # Users, Groups, UIDs and GIDs on `systemd` Systems

docs/_data/extra_pages.json

@@ -0,0 +1,10 @@
+[
+    { "category": "Project", "title": "Brand", "url": "https://brand.systemd.io/" },
+    { "category": "Project", "title": "Releases", "url": "https://github.com/systemd/systemd/releases" },
+    { "category": "Project", "title": "GitHub Project Page", "url": "https://github.com/systemd/systemd" },
+    { "category": "Project", "title": "Issues", "url": "https://github.com/systemd/systemd/issues" },
+    { "category": "Project", "title": "Pull Requests", "url": "https://github.com/systemd/systemd/pulls" },
+    { "category": "Project", "title": "Mailing List", "url": "https://lists.freedesktop.org/mailman/listinfo/systemd-devel" },
+    { "category": "Manual Pages", "title": "Index", "url": "https://www.freedesktop.org/software/systemd/man/" },
+    { "category": "Manual Pages", "title": "Directives", "url": "https://www.freedesktop.org/software/systemd/man/systemd.directives.html" }
+]

docs/index.md

@@ -4,8 +4,14 @@ title: systemd Documentation
 
 # systemd Documentation
 
-{% for p in site.pages %}
-  {% if p.url != page.url and p.title %}
-* [{{ p.title }}]({{ p.url | relative_url }})
+{% assign by_category = site.pages | group_by:"category" %}
+{% assign extra_pages = site.data.extra_pages | group_by:"category" %}
+{% assign merged = by_category | concat: extra_pages | sort:"name" %}
+
+{% for pair in merged %}
+  {% if pair.name != "" %}
+## {{ pair.name }}
+{% assign sorted = pair.items | sort:"title" %}{% for page in sorted %}
+* [{{ page.title }}]({{ page.url | relative_url }}){% endfor %}
   {% endif %}
 {% endfor %}

man/portablectl.xml

@@ -199,7 +199,7 @@
               </row>
               <row>
                 <entry><option>enabled-runtime</option></entry>
-                <entry>Like <option>enabled</option>, but the the unit files have been made available transiently only, i.e. the <command>attach</command> command has been invoked with the <option>--runtime</option> option.</entry>
+                <entry>Like <option>enabled</option>, but the unit files have been made available transiently only, i.e. the <command>attach</command> command has been invoked with the <option>--runtime</option> option.</entry>
               </row>
               <row>
                 <entry><option>running</option></entry>

man/sysctl.d.xml

@@ -60,7 +60,7 @@
     </para>
 
     <para>Any access permission errors and attempts to write variables not defined on the local system are
-    logged, but do not cause the the service to fail. Moreover, if a variable assignment is prefixed with a
+    logged, but do not cause the service to fail. Moreover, if a variable assignment is prefixed with a
     single <literal>-</literal> character, failure to set the variable will be logged, but will not cause the
     service to fail. All other errors when setting variables cause the service to return failure at the end
     (other variables are still processed).</para>

man/systemd.network.xml

@@ -2327,8 +2327,8 @@
       <varlistentry>
         <term><varname>Parent=</varname></term>
         <listitem>
-          <para>Specifies the parent Queueing Discipline (qdisc). Takes one of <literal>root</literal>
-          or <literal>clsact</literal>. Defaults to <literal>root</literal>.</para>
+          <para>Specifies the parent Queueing Discipline (qdisc). Takes one of <literal>root</literal>,
+          <literal>clsact</literal> or <literal>ingress</literal>. Defaults to <literal>root</literal>.</para>
         </listitem>
       </varlistentry>
 
@@ -2442,6 +2442,14 @@
         </listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><varname>FairQueuingControlledDelayPacketLimit=</varname></term>
+        <listitem>
+          <para>Specifies the hard limit on the real queue size. When this limit is reached, incoming packets are
+          dropped. Defaults to unset and kernel's default is used.</para>
+        </listitem>
+      </varlistentry>
+
     </variablelist>
   </refsect1>
 

man/systemd.service.xml

@@ -859,7 +859,7 @@
         effect.</para>
 
         <example>
-          <title>A service with with the the <varname>SuccessExitStatus=</varname> setting</title>
+          <title>A service with with the <varname>SuccessExitStatus=</varname> setting</title>
 
           <programlisting>SuccessExitStatus=TEMPFAIL 250 SIGUSR1</programlisting>
 

src/journal-remote/journal-upload-journal.c

@@ -103,7 +103,7 @@ static ssize_t write_entry(char *buf, size_t size, Uploader *u) {
                         _fallthrough_;
                 case ENTRY_BOOT_ID: {
                         sd_id128_t boot_id;
-                        char sid[33];
+                        char sid[SD_ID128_STRING_MAX];
 
                         r = sd_journal_get_monotonic_usec(u->journal, NULL, &boot_id);
                         if (r < 0)

src/journal/journal-file.c

@@ -3056,7 +3056,7 @@ static const char* format_timestamp_safe(char *buf, size_t l, usec_t t) {
 }
 
 void journal_file_print_header(JournalFile *f) {
-        char a[33], b[33], c[33], d[33];
+        char a[SD_ID128_STRING_MAX], b[SD_ID128_STRING_MAX], c[SD_ID128_STRING_MAX], d[SD_ID128_STRING_MAX];
         char x[FORMAT_TIMESTAMP_MAX], y[FORMAT_TIMESTAMP_MAX], z[FORMAT_TIMESTAMP_MAX];
         struct stat st;
         char bytes[FORMAT_BYTES_MAX];

src/journal/sd-journal.c

@@ -908,7 +908,7 @@ _public_ int sd_journal_previous_skip(sd_journal *j, uint64_t skip) {
 _public_ int sd_journal_get_cursor(sd_journal *j, char **cursor) {
         Object *o;
         int r;
-        char bid[33], sid[33];
+        char bid[SD_ID128_STRING_MAX], sid[SD_ID128_STRING_MAX];
 
         assert_return(j, -EINVAL);
         assert_return(!journal_pid_changed(j), -ECHILD);

src/libsystemd-network/sd-ipv4acd.c

@@ -441,7 +441,7 @@ int sd_ipv4acd_is_running(sd_ipv4acd *acd) {
         return acd->state != IPV4ACD_STATE_INIT;
 }
 
-int sd_ipv4acd_start(sd_ipv4acd *acd) {
+int sd_ipv4acd_start(sd_ipv4acd *acd, bool reset_conflicts) {
         int r;
 
         assert_return(acd, -EINVAL);
@@ -458,6 +458,8 @@ int sd_ipv4acd_start(sd_ipv4acd *acd) {
         safe_close(acd->fd);
         acd->fd = r;
         acd->defend_window = 0;
+
+        if (reset_conflicts)
                 acd->n_conflict = 0;
 
         r = sd_event_add_io(acd->event, &acd->receive_message_event_source, acd->fd, EPOLLIN, ipv4acd_on_packet, acd);

src/libsystemd-network/sd-ipv4ll.c

@@ -241,7 +241,7 @@ static int ipv4ll_start_internal(sd_ipv4ll *ll, bool reset_generation) {
                 picked_address = true;
         }
 
-        r = sd_ipv4acd_start(ll->acd);
+        r = sd_ipv4acd_start(ll->acd, reset_generation);
         if (r < 0) {
 
                 /* We couldn't start? If so, let's forget the picked address again, the user might make a change and

src/libsystemd-network/test-acd.c

@@ -47,7 +47,7 @@ static int client_run(int ifindex, const struct in_addr *pa, const struct ether_
 
         log_info("starting IPv4ACD client");
 
-        assert_se(sd_ipv4acd_start(acd) >= 0);
+        assert_se(sd_ipv4acd_start(acd, true) >= 0);
 
         assert_se(sd_event_loop(e) >= 0);
 

src/libsystemd/sd-bus/sd-bus.c

@@ -2672,7 +2672,7 @@ static int process_builtin(sd_bus *bus, sd_bus_message *m) {
                 r = sd_bus_message_new_method_return(m, &reply);
         else if (streq_ptr(m->member, "GetMachineId")) {
                 sd_id128_t id;
-                char sid[33];
+                char sid[SD_ID128_STRING_MAX];
 
                 r = sd_id128_get_machine(&id);
                 if (r < 0)

src/libsystemd/sd-id128/id128-util.c

@@ -11,7 +11,7 @@
 #include "io-util.h"
 #include "stdio-util.h"
 
-char *id128_to_uuid_string(sd_id128_t id, char s[37]) {
+char *id128_to_uuid_string(sd_id128_t id, char s[static ID128_UUID_STRING_MAX]) {
         unsigned n, k = 0;
 
         assert(s);

src/libsystemd/sd-id128/id128-util.h

@@ -8,7 +8,9 @@
 #include "hash-funcs.h"
 #include "macro.h"
 
-char *id128_to_uuid_string(sd_id128_t id, char s[37]);
+#define ID128_UUID_STRING_MAX 37
+
+char *id128_to_uuid_string(sd_id128_t id, char s[static ID128_UUID_STRING_MAX]);
 
 bool id128_is_valid(const char *s) _pure_;
 

src/libsystemd/sd-netlink/netlink-types.c

@@ -734,9 +734,53 @@ static const NLTypeSystem rtnl_nexthop_type_system = {
        .types = rtnl_nexthop_types,
 };
 
+static const NLType rtnl_tca_option_data_tbf_types[] = {
+        [TCA_TBF_PARMS]   = { .size = sizeof(struct tc_tbf_qopt) },
+        [TCA_TBF_RTAB]    = { .size = TC_RTAB_SIZE },
+        [TCA_TBF_PTAB]    = { .size = TC_RTAB_SIZE },
+        [TCA_TBF_RATE64]  = { .type = NETLINK_TYPE_U64 },
+        [TCA_TBF_PRATE64] = { .type = NETLINK_TYPE_U64 },
+        [TCA_TBF_BURST]   = { .type = NETLINK_TYPE_U32 },
+        [TCA_TBF_PBURST]  = { .type = NETLINK_TYPE_U32 },
+};
+
+static const NLType rtnl_tca_option_data_fq_codel_types[] = {
+        [TCA_FQ_CODEL_TARGET]          = { .type = NETLINK_TYPE_U32 },
+        [TCA_FQ_CODEL_LIMIT]           = { .type = NETLINK_TYPE_U32 },
+        [TCA_FQ_CODEL_INTERVAL]        = { .type = NETLINK_TYPE_U32 },
+        [TCA_FQ_CODEL_ECN]             = { .type = NETLINK_TYPE_U32 },
+        [TCA_FQ_CODEL_FLOWS]           = { .type = NETLINK_TYPE_U32 },
+        [TCA_FQ_CODEL_QUANTUM]         = { .type = NETLINK_TYPE_U32 },
+        [TCA_FQ_CODEL_CE_THRESHOLD]    = { .type = NETLINK_TYPE_U32 },
+        [TCA_FQ_CODEL_DROP_BATCH_SIZE] = { .type = NETLINK_TYPE_U32 },
+        [TCA_FQ_CODEL_MEMORY_LIMIT]    = { .type = NETLINK_TYPE_U32 },
+};
+
+static const char* const nl_union_tca_option_data_table[] = {
+        [NL_UNION_TCA_OPTION_DATA_TBF] = "tbf",
+        [NL_UNION_TCA_OPTION_DATA_FQ_CODEL] = "fq_codel",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(nl_union_tca_option_data, NLUnionTCAOptionData);
+
+static const NLTypeSystem rtnl_tca_option_data_type_systems[] = {
+        [NL_UNION_TCA_OPTION_DATA_TBF] =         { .count = ELEMENTSOF(rtnl_tca_option_data_tbf_types),
+                                                   .types = rtnl_tca_option_data_tbf_types },
+        [NL_UNION_TCA_OPTION_DATA_FQ_CODEL] =    { .count = ELEMENTSOF(rtnl_tca_option_data_fq_codel_types),
+                                                   .types = rtnl_tca_option_data_fq_codel_types },
+};
+
+static const NLTypeSystemUnion rtnl_tca_option_data_type_system_union = {
+        .num = _NL_UNION_TCA_OPTION_DATA_MAX,
+        .lookup = nl_union_tca_option_data_from_string,
+        .type_systems = rtnl_tca_option_data_type_systems,
+        .match_type = NL_MATCH_SIBLING,
+        .match = TCA_KIND,
+};
+
 static const NLType rtnl_qdisc_types[] = {
         [TCA_KIND]           = { .type = NETLINK_TYPE_STRING },
-        [TCA_OPTIONS]        = { .size = sizeof(struct tc_netem_qopt) },
+        [TCA_OPTIONS]        = { .type = NETLINK_TYPE_UNION, .type_system_union = &rtnl_tca_option_data_type_system_union },
         [TCA_INGRESS_BLOCK]  = { .type = NETLINK_TYPE_U32 },
         [TCA_EGRESS_BLOCK]   = { .type = NETLINK_TYPE_U32 },
 };

src/libsystemd/sd-netlink/netlink-types.h

@@ -90,3 +90,13 @@ typedef enum NLUnionLinkInfoData {
 
 const char *nl_union_link_info_data_to_string(NLUnionLinkInfoData p) _const_;
 NLUnionLinkInfoData nl_union_link_info_data_from_string(const char *p) _pure_;
+
+typedef enum NLUnionTCAOptionData {
+        NL_UNION_TCA_OPTION_DATA_TBF,
+        NL_UNION_TCA_OPTION_DATA_FQ_CODEL,
+        _NL_UNION_TCA_OPTION_DATA_MAX,
+        _NL_UNION_TCA_OPTION_DATA_INVALID = -1,
+} NLUnionTCAOptionData;
+
+const char *nl_union_tca_option_data_to_string(NLUnionTCAOptionData p) _const_;
+NLUnionTCAOptionData nl_union_tca_option_data_from_string(const char *p) _pure_;

src/network/meson.build

@@ -107,6 +107,8 @@ sources = files('''
         networkd-util.h
         networkd-wifi.c
         networkd-wifi.h
+        tc/fq-codel.c
+        tc/fq-codel.h
         tc/netem.c
         tc/netem.h
         tc/qdisc.c

src/network/networkd-address.c

@@ -670,7 +670,7 @@ int address_configure(
                         log_debug("Starting IPv4ACD client. Probing address %s", strna(pretty));
                 }
 
-                r = sd_ipv4acd_start(address->acd);
+                r = sd_ipv4acd_start(address->acd, true);
                 if (r < 0)
                         log_link_warning_errno(link, r, "Failed to start IPv4ACD client, ignoring: %m");
         }

src/network/networkd-network-gperf.gperf

@@ -258,6 +258,7 @@ TrafficControlQueueingDiscipline.TokenBufferFilterMPUBytes,                  con
 TrafficControlQueueingDiscipline.TokenBufferFilterPeakRate,                  config_parse_tc_token_buffer_filter_size,                    0, 0
 TrafficControlQueueingDiscipline.TokenBufferFilterLatencySec,                config_parse_tc_token_buffer_filter_latency,                 0, 0
 TrafficControlQueueingDiscipline.StochasticFairnessQueueingPerturbPeriodSec, config_parse_tc_stochastic_fairness_queueing_perturb_period, 0, 0
+TrafficControlQueueingDiscipline.FairQueuingControlledDelayPacketLimit,      config_parse_tc_fair_queuing_controlled_delay_limit,         0, 0
 /* backwards compatibility: do not add new entries to this section */
 Network.IPv4LL,                         config_parse_ipv4ll,                             0,                             offsetof(Network, link_local)
 DHCP.ClientIdentifier,                  config_parse_dhcp_client_identifier,             0,                             offsetof(Network, dhcp_client_identifier)

src/network/tc/fq-codel.c

@@ -0,0 +1,91 @@
+/* SPDX-License-Identifier: LGPL-2.1+
+ * Copyright © 2019 VMware, Inc. */
+
+#include <linux/pkt_sched.h>
+
+#include "alloc-util.h"
+#include "conf-parser.h"
+#include "netlink-util.h"
+#include "parse-util.h"
+#include "qdisc.h"
+#include "string-util.h"
+
+int fair_queuing_controlled_delay_new(FairQueuingControlledDelay **ret) {
+        FairQueuingControlledDelay *fqcd = NULL;
+
+        fqcd = new0(FairQueuingControlledDelay, 1);
+        if (!fqcd)
+                return -ENOMEM;
+
+        *ret = TAKE_PTR(fqcd);
+
+        return 0;
+}
+
+int fair_queuing_controlled_delay_fill_message(Link *link, const FairQueuingControlledDelay *fqcd, sd_netlink_message *req) {
+        int r;
+
+        assert(link);
+        assert(fqcd);
+        assert(req);
+
+        r = sd_netlink_message_open_container_union(req, TCA_OPTIONS, "fq_codel");
+        if (r < 0)
+                return log_link_error_errno(link, r, "Could not open container TCA_OPTIONS: %m");
+
+        r = sd_netlink_message_append_u32(req, TCA_FQ_CODEL_LIMIT, fqcd->limit);
+        if (r < 0)
+                return log_link_error_errno(link, r, "Could not append TCA_FQ_CODEL_LIMIT attribute: %m");
+
+        r = sd_netlink_message_close_container(req);
+        if (r < 0)
+                return log_link_error_errno(link, r, "Could not close container TCA_OPTIONS: %m");
+
+        return 0;
+}
+
+int config_parse_tc_fair_queuing_controlled_delay_limit(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL;
+        Network *network = data;
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = qdisc_new_static(network, filename, section_line, &qdisc);
+        if (r < 0)
+                return r;
+
+        if (isempty(rvalue)) {
+                qdisc->fq_codel.limit = 0;
+
+                qdisc = NULL;
+                return 0;
+        }
+
+        r = safe_atou32(rvalue, &qdisc->fq_codel.limit);
+        if (r < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, r,
+                           "Failed to parse '%s=', ignoring assignment: %s",
+                           lvalue, rvalue);
+                return 0;
+        }
+
+        qdisc->has_fair_queuing_controlled_delay = true;
+        qdisc = NULL;
+
+        return 0;
+}

src/network/tc/fq-codel.h

@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: LGPL-2.1+
+ * Copyright © 2019 VMware, Inc. */
+#pragma once
+
+#include "sd-netlink.h"
+
+#include "conf-parser.h"
+#include "networkd-link.h"
+
+typedef struct FairQueuingControlledDelay {
+        uint32_t limit;
+} FairQueuingControlledDelay;
+
+int fair_queuing_controlled_delay_new(FairQueuingControlledDelay **ret);
+int fair_queuing_controlled_delay_fill_message(Link *link, const FairQueuingControlledDelay *sfq, sd_netlink_message *req);
+
+CONFIG_PARSER_PROTOTYPE(config_parse_tc_fair_queuing_controlled_delay_limit);

src/network/tc/qdisc.c

@@ -84,6 +84,7 @@ void qdisc_free(QDisc *qdisc) {
 
         network_config_section_free(qdisc->section);
 
+        free(qdisc->tca_kind);
         free(qdisc);
 }
 
@@ -116,6 +117,7 @@ static int qdisc_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 int qdisc_configure(Link *link, QDisc *qdisc) {
         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
         _cleanup_free_ char *tca_kind = NULL;
+        char *p;
         int r;
 
         assert(link);
@@ -131,12 +133,8 @@ int qdisc_configure(Link *link, QDisc *qdisc) {
         if (r < 0)
                 return log_link_error_errno(link, r, "Could not create tcm_parent message: %m");
 
-        if (qdisc->parent == TC_H_CLSACT) {
-                tca_kind = strdup("clsact");
-                if (!tca_kind)
-                        return log_oom();
-
-                r = sd_rtnl_message_set_qdisc_handle(req, TC_H_MAKE(TC_H_CLSACT, 0));
+        if (qdisc->handle != TC_H_UNSPEC) {
+                r = sd_rtnl_message_set_qdisc_handle(req, qdisc->handle);
                 if (r < 0)
                         return log_link_error_errno(link, r, "Could not set tcm_handle message: %m");
         }
@@ -171,8 +169,19 @@ int qdisc_configure(Link *link, QDisc *qdisc) {
                         return r;
         }
 
-        if (tca_kind) {
-                r = sd_netlink_message_append_string(req, TCA_KIND, tca_kind);
+        if (qdisc->has_fair_queuing_controlled_delay) {
+                r = free_and_strdup(&tca_kind, "fq_codel");
+                if (r < 0)
+                        return log_oom();
+
+                r = fair_queuing_controlled_delay_fill_message(link, &qdisc->fq_codel, req);
+                if (r < 0)
+                        return r;
+        }
+
+        p = tca_kind ?:qdisc->tca_kind;
+        if (p) {
+                r = sd_netlink_message_append_string(req, TCA_KIND, p);
                 if (r < 0)
                         return log_link_error_errno(link, r, "Could not append TCA_KIND attribute: %m");
         }
@@ -218,10 +227,10 @@ int qdisc_section_verify(QDisc *qdisc, bool *has_root, bool *has_clsact) {
                                                  "Ignoring [TrafficControlQueueingDiscipline] section from line %u.",
                                                  qdisc->section->filename, qdisc->section->line);
                 *has_root = true;
-        } else if (qdisc->parent == TC_H_CLSACT) {
+        } else if (qdisc->parent == TC_H_CLSACT) { /* TC_H_CLSACT == TC_H_INGRESS */
                 if (*has_clsact)
                         return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
-                                                 "%s: More than one clsact TrafficControlQueueingDiscipline sections are defined. "
+                                                 "%s: More than one clsact or ingress TrafficControlQueueingDiscipline sections are defined. "
                                                  "Ignoring [TrafficControlQueueingDiscipline] section from line %u.",
                                                  qdisc->section->filename, qdisc->section->line);
                 *has_clsact = true;
@@ -255,17 +264,30 @@ int config_parse_tc_qdiscs_parent(
         if (r < 0)
                 return r;
 
-        if (streq(rvalue, "root"))
+        if (streq(rvalue, "root")) {
                 qdisc->parent = TC_H_ROOT;
-        else if (streq(rvalue, "clsact"))
+                qdisc->handle = TC_H_UNSPEC;
+        } else if (streq(rvalue, "clsact")) {
                 qdisc->parent = TC_H_CLSACT;
-        else {
+                qdisc->handle = TC_H_MAKE(TC_H_CLSACT, 0);
+        } else if (streq(rvalue, "ingress")) {
+                qdisc->parent = TC_H_INGRESS;
+                qdisc->handle = TC_H_MAKE(TC_H_INGRESS, 0);
+        } else {
                 log_syntax(unit, LOG_ERR, filename, line, r,
-                           "Failed to parse [QueueDiscs] 'Parent=', ignoring assignment: %s",
+                           "Failed to parse 'Parent=', ignoring assignment: %s",
                            rvalue);
                 return 0;
         }
 
+        if (streq(rvalue, "root"))
+                qdisc->tca_kind = mfree(qdisc->tca_kind);
+        else {
+                r = free_and_strdup(&qdisc->tca_kind, rvalue);
+                if (r < 0)
+                        return log_oom();
+        }
+
         qdisc = NULL;
 
         return 0;

src/network/tc/qdisc.h

@@ -3,6 +3,7 @@
 #pragma once
 
 #include "conf-parser.h"
+#include "fq-codel.h"
 #include "netem.h"
 #include "networkd-link.h"
 #include "networkd-network.h"
@@ -21,13 +22,16 @@ typedef struct QDisc {
         uint32_t handle;
         uint32_t parent;
 
+        char *tca_kind;
         bool has_network_emulator:1;
         bool has_token_buffer_filter:1;
         bool has_stochastic_fairness_queueing:1;
+        bool has_fair_queuing_controlled_delay:1;
 
         NetworkEmulator ne;
         TokenBufferFilter tbf;
         StochasticFairnessQueueing sfq;
+        FairQueuingControlledDelay fq_codel;
 } QDisc;
 
 void qdisc_free(QDisc *qdisc);

src/network/tc/tbf.c

@@ -74,7 +74,7 @@ int token_buffer_filter_fill_message(Link *link, const TokenBufferFilter *tbf, s
                         return log_link_error_errno(link, r, "Failed to calculate mtu size: %m");
         }
 
-        r = sd_netlink_message_open_array(req, TCA_OPTIONS);
+        r = sd_netlink_message_open_container_union(req, TCA_OPTIONS, "tbf");
         if (r < 0)
                 return log_link_error_errno(link, r, "Could not open container TCA_OPTIONS: %m");
 
@@ -87,7 +87,7 @@ int token_buffer_filter_fill_message(Link *link, const TokenBufferFilter *tbf, s
                 return log_link_error_errno(link, r, "Could not append TCA_TBF_BURST attribute: %m");
 
         if (tbf->rate >= (1ULL << 32)) {
-                r = sd_netlink_message_append_data(req, TCA_TBF_RATE64, &tbf->rate, sizeof(tbf->rate));
+                r = sd_netlink_message_append_u64(req, TCA_TBF_RATE64, tbf->rate);
                 if (r < 0)
                         return log_link_error_errno(link, r, "Could not append TCA_TBF_RATE64 attribute: %m");
         }
@@ -98,12 +98,12 @@ int token_buffer_filter_fill_message(Link *link, const TokenBufferFilter *tbf, s
 
         if (opt.peakrate.rate > 0) {
                 if (tbf->peak_rate >= (1ULL << 32)) {
-                        r = sd_netlink_message_append_data(req, TCA_TBF_PRATE64, &tbf->peak_rate, sizeof(tbf->peak_rate));
+                        r = sd_netlink_message_append_u64(req, TCA_TBF_PRATE64, tbf->peak_rate);
                         if (r < 0)
                                 return log_link_error_errno(link, r, "Could not append TCA_TBF_PRATE64 attribute: %m");
                 }
 
-                r = sd_netlink_message_append_data(req, TCA_TBF_PBURST, &tbf->mtu, sizeof(tbf->mtu));
+                r = sd_netlink_message_append_u32(req, TCA_TBF_PBURST, tbf->mtu);
                 if (r < 0)
                         return log_link_error_errno(link, r, "Could not append TCA_TBF_PBURST attribute: %m");
 

src/nspawn/nspawn.c

@@ -2229,9 +2229,9 @@ static int setup_hostname(void) {
 
 static int setup_journal(const char *directory) {
         _cleanup_free_ char *d = NULL;
+        char id[SD_ID128_STRING_MAX];
         const char *dirname, *p, *q;
         sd_id128_t this_id;
-        char id[33];
         bool try;
         int r;
 
@@ -2866,7 +2866,7 @@ static int inner_child(
                 FDSet *fds) {
 
         _cleanup_free_ char *home = NULL;
-        char as_uuid[37];
+        char as_uuid[ID128_UUID_STRING_MAX];
         size_t n_env = 1;
         const char *envp[] = {
                 "PATH=" DEFAULT_PATH_COMPAT,

src/shared/logs-show.c

@@ -17,6 +17,7 @@
 #include "format-util.h"
 #include "hashmap.h"
 #include "hostname-util.h"
+#include "id128-util.h"
 #include "io-util.h"
 #include "journal-internal.h"
 #include "json.h"
@@ -26,8 +27,8 @@
 #include "namespace-util.h"
 #include "output-mode.h"
 #include "parse-util.h"
-#include "process-util.h"
 #include "pretty-print.h"
+#include "process-util.h"
 #include "sparse-endian.h"
 #include "stdio-util.h"
 #include "string-table.h"
@@ -654,7 +655,7 @@ static int output_export(
                 const size_t highlight[2]) {
 
         sd_id128_t boot_id;
-        char sid[33];
+        char sid[SD_ID128_STRING_MAX];
         int r;
         usec_t realtime, monotonic;
         _cleanup_free_ char *cursor = NULL;
@@ -1353,8 +1354,8 @@ int add_matches_for_user_unit(sd_journal *j, const char *unit, uid_t uid) {
 static int get_boot_id_for_machine(const char *machine, sd_id128_t *boot_id) {
         _cleanup_close_pair_ int pair[2] = { -1, -1 };
         _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, rootfd = -1;
+        char buf[ID128_UUID_STRING_MAX];
         pid_t pid, child;
-        char buf[37];
         ssize_t k;
         int r;
 

src/systemd/sd-ipv4acd.h

@@ -20,6 +20,7 @@
 
 #include <net/ethernet.h>
 #include <netinet/in.h>
+#include <stdbool.h>
 
 #include "sd-event.h"
 
@@ -44,7 +45,7 @@ int sd_ipv4acd_set_mac(sd_ipv4acd *acd, const struct ether_addr *addr);
 int sd_ipv4acd_set_ifindex(sd_ipv4acd *acd, int interface_index);
 int sd_ipv4acd_set_address(sd_ipv4acd *acd, const struct in_addr *address);
 int sd_ipv4acd_is_running(sd_ipv4acd *acd);
-int sd_ipv4acd_start(sd_ipv4acd *acd);
+int sd_ipv4acd_start(sd_ipv4acd *acd, bool reset_conflicts);
 int sd_ipv4acd_stop(sd_ipv4acd *acd);
 sd_ipv4acd *sd_ipv4acd_ref(sd_ipv4acd *acd);
 sd_ipv4acd *sd_ipv4acd_unref(sd_ipv4acd *acd);

src/test/test-id128.c

@@ -21,7 +21,7 @@
 
 int main(int argc, char *argv[]) {
         sd_id128_t id, id2;
-        char t[33], q[37];
+        char t[SD_ID128_STRING_MAX], q[ID128_UUID_STRING_MAX];
         _cleanup_free_ char *b = NULL;
         _cleanup_close_ int fd = -1;
         int r;

src/veritysetup/veritysetup-generator.c

@@ -166,7 +166,7 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat
 static int determine_devices(void) {
         _cleanup_free_ void *m = NULL;
         sd_id128_t root_uuid, verity_uuid;
-        char ids[37];
+        char ids[ID128_UUID_STRING_MAX];
         size_t l;
         int r;
 

test/fuzz/fuzz-network-parser/directives.network

@@ -278,3 +278,4 @@ TokenBufferFilterMPUBytes=
 TokenBufferFilterPeakRate=
 TokenBufferFilterLatencySec=
 StochasticFairnessQueueingPerturbPeriodSec=
+FairQueuingControlledDelayPacketLimit=

test/test-network/conf/25-qdisc-netem-and-fqcodel.network

@@ -13,8 +13,5 @@ NetworkEmulatorLossRate=20%
 NetworkEmulatorPacketLimit=100
 
 [TrafficControlQueueingDiscipline]
-Parent=clsact
-NetworkEmulatorDelaySec=100ms
-NetworkEmulatorDelayJitterSec=13ms
-NetworkEmulatorLossRate=20.5%
-NetworkEmulatorPacketLimit=200
+Parent=ingress
+FairQueuingControlledDelayPacketLimit=20480

test/test-network/systemd-networkd-tests.py

@@ -1509,7 +1509,7 @@ class NetworkdNetworkTests(unittest.TestCase, Utilities):
         '25-neighbor-ip-dummy.network',
         '25-neighbor-ip.network',
         '25-nexthop.network',
-        '25-qdisc-netem.network',
+        '25-qdisc-netem-and-fqcodel.network',
         '25-qdisc-tbf-and-sfq.network',
         '25-route-ipv6-src.network',
         '25-route-static.network',
@@ -2083,7 +2083,7 @@ class NetworkdNetworkTests(unittest.TestCase, Utilities):
         self.assertRegex(output, '192.168.5.1')
 
     def test_qdisc(self):
-        copy_unit_to_networkd_unit_path('25-qdisc-netem.network', '12-dummy.netdev',
+        copy_unit_to_networkd_unit_path('25-qdisc-netem-and-fqcodel.network', '12-dummy.netdev',
                                         '25-qdisc-tbf-and-sfq.network', '11-dummy.netdev')
         start_networkd()
 
@@ -2093,7 +2093,8 @@ class NetworkdNetworkTests(unittest.TestCase, Utilities):
         print(output)
         self.assertRegex(output, 'qdisc netem')
         self.assertRegex(output, 'limit 100 delay 50.0ms  10.0ms loss 20%')
-        self.assertRegex(output, 'limit 200 delay 100.0ms  13.0ms loss 20.5%')
+        self.assertRegex(output, 'qdisc fq_codel')
+        self.assertRegex(output, 'limit 20480p')
         output = check_output('tc qdisc show dev test1')
         print(output)
         self.assertRegex(output, 'qdisc tbf')