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-rw-r--r--man/systemd.unit.xml14
-rw-r--r--src/basic/cgroup-util.c1
-rw-r--r--src/basic/cgroup-util.h2
-rw-r--r--src/core/cgroup.c117
-rw-r--r--src/core/cgroup.h24
-rw-r--r--src/core/dbus-unit.c1
-rw-r--r--src/core/load-fragment-gperf.gperf.m43
-rw-r--r--src/core/load-fragment.c42
-rw-r--r--src/core/load-fragment.h1
-rw-r--r--src/core/manager.c4
-rw-r--r--src/core/manager.h4
-rw-r--r--src/core/unit.c27
-rw-r--r--src/core/unit.h5
13 files changed, 241 insertions, 4 deletions
diff --git a/man/systemd.unit.xml b/man/systemd.unit.xml
index ea58580bba..015deab4bb 100644
--- a/man/systemd.unit.xml
+++ b/man/systemd.unit.xml
@@ -1044,6 +1044,20 @@
files. This functionality should not be used in normal
units.</para></listitem>
</varlistentry>
+
+ <varlistentry>
+ <term><varname>NetClass=</varname></term>
+ <listitem><para>Configures a network class number to assign to the
+ unit. This value will be set to the
+ <literal>net_cls.class_id</literal> property of the
+ <literal>net_cls</literal> cgroup of the unit. The directive
+ accepts a numerical value (for fixed number assignment) and the keyword
+ <literal>auto</literal> (for dynamic allocation). Network traffic of
+ all processes inside the unit will have the network class ID assigned
+ by the kernel. Also see
+ <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ .</para></listitem>
+ </varlistentry>
</variablelist>
</refsect1>
diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index 4bf08cfe03..95fc2b9e5d 100644
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -2254,6 +2254,7 @@ static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = {
[CGROUP_CONTROLLER_MEMORY] = "memory",
[CGROUP_CONTROLLER_DEVICES] = "devices",
[CGROUP_CONTROLLER_PIDS] = "pids",
+ [CGROUP_CONTROLLER_NET_CLS] = "net_cls",
};
DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController);
diff --git a/src/basic/cgroup-util.h b/src/basic/cgroup-util.h
index 33ca28cab7..01359fa7cb 100644
--- a/src/basic/cgroup-util.h
+++ b/src/basic/cgroup-util.h
@@ -36,6 +36,7 @@ typedef enum CGroupController {
CGROUP_CONTROLLER_MEMORY,
CGROUP_CONTROLLER_DEVICES,
CGROUP_CONTROLLER_PIDS,
+ CGROUP_CONTROLLER_NET_CLS,
_CGROUP_CONTROLLER_MAX,
_CGROUP_CONTROLLER_INVALID = -1,
} CGroupController;
@@ -50,6 +51,7 @@ typedef enum CGroupMask {
CGROUP_MASK_MEMORY = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_MEMORY),
CGROUP_MASK_DEVICES = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_DEVICES),
CGROUP_MASK_PIDS = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_PIDS),
+ CGROUP_MASK_NET_CLS = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_NET_CLS),
_CGROUP_MASK_ALL = CGROUP_CONTROLLER_TO_MASK(_CGROUP_CONTROLLER_MAX) - 1
} CGroupMask;
diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index 7d2a2ba67a..0c790c33da 100644
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -47,6 +47,8 @@ void cgroup_context_init(CGroupContext *c) {
c->startup_blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID;
c->tasks_max = (uint64_t) -1;
+
+ c->netclass_type = CGROUP_NETCLASS_TYPE_NONE;
}
void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) {
@@ -291,7 +293,7 @@ fail:
return -errno;
}
-void cgroup_context_apply(CGroupContext *c, CGroupMask mask, const char *path, ManagerState state) {
+void cgroup_context_apply(CGroupContext *c, CGroupMask mask, const char *path, uint32_t netclass, ManagerState state) {
bool is_root;
int r;
@@ -489,6 +491,17 @@ void cgroup_context_apply(CGroupContext *c, CGroupMask mask, const char *path, M
log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r,
"Failed to set pids.max on %s: %m", path);
}
+
+ if (mask & CGROUP_MASK_NET_CLS) {
+ char buf[DECIMAL_STR_MAX(uint32_t)];
+
+ sprintf(buf, "%" PRIu32, netclass);
+
+ r = cg_set_attribute("net_cls", path, "net_cls.classid", buf);
+ if (r < 0)
+ log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r,
+ "Failed to set net_cls.classid on %s: %m", path);
+ }
}
CGroupMask cgroup_context_get_mask(CGroupContext *c) {
@@ -521,6 +534,9 @@ CGroupMask cgroup_context_get_mask(CGroupContext *c) {
c->tasks_max != (uint64_t) -1)
mask |= CGROUP_MASK_PIDS;
+ if (c->netclass_type != CGROUP_NETCLASS_TYPE_NONE)
+ mask |= CGROUP_MASK_NET_CLS;
+
return mask;
}
@@ -888,6 +904,103 @@ static bool unit_has_mask_realized(Unit *u, CGroupMask target_mask) {
return u->cgroup_realized && u->cgroup_realized_mask == target_mask;
}
+static int unit_find_free_netclass_cgroup(Unit *u, uint32_t *ret) {
+
+ uint32_t start, i;
+ Manager *m;
+
+ assert(u);
+
+ m = u->manager;
+
+ i = start = m->cgroup_netclass_registry_last;
+
+ do {
+ i++;
+
+ if (!hashmap_get(m->cgroup_netclass_registry, UINT_TO_PTR(i))) {
+ m->cgroup_netclass_registry_last = i;
+ *ret = i;
+ return 0;
+ }
+
+ if (i == UINT32_MAX)
+ i = CGROUP_NETCLASS_FIXED_MAX;
+
+ } while (i != start);
+
+ return -ENOBUFS;
+}
+
+int unit_add_to_netclass_cgroup(Unit *u) {
+
+ CGroupContext *cc;
+ Unit *first;
+ void *key;
+ int r;
+
+ assert(u);
+
+ cc = unit_get_cgroup_context(u);
+ if (!cc)
+ return 0;
+
+ switch (cc->netclass_type) {
+ case CGROUP_NETCLASS_TYPE_NONE:
+ return 0;
+
+ case CGROUP_NETCLASS_TYPE_FIXED:
+ u->cgroup_netclass_id = cc->netclass_id;
+ break;
+
+ case CGROUP_NETCLASS_TYPE_AUTO:
+ /* Allocate a new ID in case it was requested and not done yet */
+ if (u->cgroup_netclass_id == 0) {
+ r = unit_find_free_netclass_cgroup(u, &u->cgroup_netclass_id);
+ if (r < 0)
+ return r;
+
+ log_debug("Dynamically assigned netclass cgroup id %" PRIu32 " to %s", u->cgroup_netclass_id, u->id);
+ }
+
+ break;
+ }
+
+ r = hashmap_ensure_allocated(&u->manager->cgroup_netclass_registry, &trivial_hash_ops);
+ if (r < 0)
+ return r;
+
+ key = UINT32_TO_PTR(u->cgroup_netclass_id);
+ first = hashmap_get(u->manager->cgroup_netclass_registry, key);
+
+ if (first) {
+ LIST_PREPEND(cgroup_netclass, first, u);
+ return hashmap_replace(u->manager->cgroup_netclass_registry, key, u);
+ }
+
+ return hashmap_put(u->manager->cgroup_netclass_registry, key, u);
+}
+
+int unit_remove_from_netclass_cgroup(Unit *u) {
+
+ Unit *head;
+ void *key;
+
+ assert(u);
+
+ key = UINT32_TO_PTR(u->cgroup_netclass_id);
+
+ LIST_FIND_HEAD(cgroup_netclass, u, head);
+ LIST_REMOVE(cgroup_netclass, head, u);
+
+ if (head)
+ return hashmap_replace(u->manager->cgroup_netclass_registry, key, head);
+
+ hashmap_remove(u->manager->cgroup_netclass_registry, key);
+
+ return 0;
+}
+
/* Check if necessary controllers and attributes for a unit are in place.
*
* If so, do nothing.
@@ -923,7 +1036,7 @@ static int unit_realize_cgroup_now(Unit *u, ManagerState state) {
return r;
/* Finally, apply the necessary attributes. */
- cgroup_context_apply(unit_get_cgroup_context(u), target_mask, u->cgroup_path, state);
+ cgroup_context_apply(unit_get_cgroup_context(u), target_mask, u->cgroup_path, u->cgroup_netclass_id, state);
return 0;
}
diff --git a/src/core/cgroup.h b/src/core/cgroup.h
index e897b31451..457544b49f 100644
--- a/src/core/cgroup.h
+++ b/src/core/cgroup.h
@@ -26,6 +26,11 @@
#include "list.h"
#include "time-util.h"
+/* Maximum value for fixed (manual) net class ID assignment,
+ * and also the value at which the range of automatic assignments starts
+ */
+#define CGROUP_NETCLASS_FIXED_MAX UINT32_C(65535)
+
typedef struct CGroupContext CGroupContext;
typedef struct CGroupDeviceAllow CGroupDeviceAllow;
typedef struct CGroupBlockIODeviceWeight CGroupBlockIODeviceWeight;
@@ -47,6 +52,17 @@ typedef enum CGroupDevicePolicy {
_CGROUP_DEVICE_POLICY_INVALID = -1
} CGroupDevicePolicy;
+typedef enum CGroupNetClassType {
+ /* Default - do not assign a net class */
+ CGROUP_NETCLASS_TYPE_NONE,
+
+ /* Automatically assign a net class */
+ CGROUP_NETCLASS_TYPE_AUTO,
+
+ /* Assign the net class that was provided by the user */
+ CGROUP_NETCLASS_TYPE_FIXED,
+} CGroupNetClassType;
+
struct CGroupDeviceAllow {
LIST_FIELDS(CGroupDeviceAllow, device_allow);
char *path;
@@ -88,6 +104,9 @@ struct CGroupContext {
CGroupDevicePolicy device_policy;
LIST_HEAD(CGroupDeviceAllow, device_allow);
+ CGroupNetClassType netclass_type;
+ uint32_t netclass_id;
+
uint64_t tasks_max;
bool delegate;
@@ -99,7 +118,7 @@ struct CGroupContext {
void cgroup_context_init(CGroupContext *c);
void cgroup_context_done(CGroupContext *c);
void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix);
-void cgroup_context_apply(CGroupContext *c, CGroupMask mask, const char *path, ManagerState state);
+void cgroup_context_apply(CGroupContext *c, CGroupMask mask, const char *path, uint32_t netclass_id, ManagerState state);
CGroupMask cgroup_context_get_mask(CGroupContext *c);
@@ -127,6 +146,9 @@ int unit_watch_cgroup(Unit *u);
int unit_attach_pids_to_cgroup(Unit *u);
+int unit_add_to_netclass_cgroup(Unit *u);
+int unit_remove_from_netclass_cgroup(Unit *u);
+
int manager_setup_cgroup(Manager *m);
void manager_shutdown_cgroup(Manager *m, bool delete);
diff --git a/src/core/dbus-unit.c b/src/core/dbus-unit.c
index f7e9795928..cd88a87340 100644
--- a/src/core/dbus-unit.c
+++ b/src/core/dbus-unit.c
@@ -679,6 +679,7 @@ const sd_bus_vtable bus_unit_vtable[] = {
SD_BUS_PROPERTY("Asserts", "a(sbbsi)", property_get_conditions, offsetof(Unit, asserts), 0),
SD_BUS_PROPERTY("LoadError", "(ss)", property_get_load_error, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Transient", "b", bus_property_get_bool, offsetof(Unit, transient), SD_BUS_VTABLE_PROPERTY_CONST),
+ SD_BUS_PROPERTY("NetClass", "u", bus_property_get_unsigned, offsetof(Unit, cgroup_netclass_id), 0),
SD_BUS_METHOD("Start", "s", "o", method_start, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("Stop", "s", "o", method_stop, SD_BUS_VTABLE_UNPRIVILEGED),
diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4
index e056fd863c..ec744214c1 100644
--- a/src/core/load-fragment-gperf.gperf.m4
+++ b/src/core/load-fragment-gperf.gperf.m4
@@ -126,7 +126,8 @@ $1.BlockIOReadBandwidth, config_parse_blockio_bandwidth, 0,
$1.BlockIOWriteBandwidth, config_parse_blockio_bandwidth, 0, offsetof($1, cgroup_context)
$1.TasksAccounting, config_parse_bool, 0, offsetof($1, cgroup_context.tasks_accounting)
$1.TasksMax, config_parse_tasks_max, 0, offsetof($1, cgroup_context)
-$1.Delegate, config_parse_bool, 0, offsetof($1, cgroup_context.delegate)'
+$1.Delegate, config_parse_bool, 0, offsetof($1, cgroup_context.delegate)
+$1.NetClass, config_parse_netclass, 0, offsetof($1, cgroup_context)'
)m4_dnl
Unit.Description, config_parse_unit_string_printf, 0, offsetof(Unit, description)
Unit.Documentation, config_parse_documentation, 0, offsetof(Unit, documentation)
diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index b476d472b3..1217b4651e 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -2962,6 +2962,48 @@ int config_parse_blockio_bandwidth(
return 0;
}
+int config_parse_netclass(
+ 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) {
+
+ CGroupContext *c = data;
+ unsigned v;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ if (streq(rvalue, "auto")) {
+ c->netclass_type = CGROUP_NETCLASS_TYPE_AUTO;
+ return 0;
+ }
+
+ r = safe_atou32(rvalue, &v);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+ "Netclass '%s' invalid. Ignoring.", rvalue);
+ return 0;
+ }
+
+ if (v > CGROUP_NETCLASS_FIXED_MAX)
+ log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+ "Fixed netclass %" PRIu32 " out of allowed range (0-%d). Applying anyway.", v, (uint32_t) CGROUP_NETCLASS_FIXED_MAX);
+
+ c->netclass_id = v;
+ c->netclass_type = CGROUP_NETCLASS_TYPE_FIXED;
+
+ return 0;
+}
+
DEFINE_CONFIG_PARSE_ENUM(config_parse_job_mode, job_mode, JobMode, "Failed to parse job mode");
int config_parse_job_mode_isolate(
diff --git a/src/core/load-fragment.h b/src/core/load-fragment.h
index 638b343a6e..5d0a09249f 100644
--- a/src/core/load-fragment.h
+++ b/src/core/load-fragment.h
@@ -90,6 +90,7 @@ int config_parse_device_allow(const char *unit, const char *filename, unsigned l
int config_parse_blockio_weight(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);
int config_parse_blockio_device_weight(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);
int config_parse_blockio_bandwidth(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);
+int config_parse_netclass(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);
int config_parse_job_mode(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);
int config_parse_job_mode_isolate(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);
int config_parse_exec_selinux_context(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);
diff --git a/src/core/manager.c b/src/core/manager.c
index 8e518fbaaf..4e672a8c48 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -579,6 +579,8 @@ int manager_new(ManagerRunningAs running_as, bool test_run, Manager **_m) {
m->have_ask_password = -EINVAL; /* we don't know */
m->first_boot = -1;
+ m->cgroup_netclass_registry_last = CGROUP_NETCLASS_FIXED_MAX;
+
m->test_run = test_run;
/* Reboot immediately if the user hits C-A-D more often than 7x per 2s */
@@ -960,6 +962,8 @@ Manager* manager_free(Manager *m) {
hashmap_free(m->cgroup_unit);
set_free_free(m->unit_path_cache);
+ hashmap_free(m->cgroup_netclass_registry);
+
free(m->switch_root);
free(m->switch_root_init);
diff --git a/src/core/manager.h b/src/core/manager.h
index 5cf0dbd508..b955982100 100644
--- a/src/core/manager.h
+++ b/src/core/manager.h
@@ -303,6 +303,10 @@ struct Manager {
const char *unit_log_format_string;
int first_boot;
+
+ /* Used for NetClass=auto units */
+ Hashmap *cgroup_netclass_registry;
+ uint32_t cgroup_netclass_registry_last;
};
int manager_new(ManagerRunningAs running_as, bool test_run, Manager **m);
diff --git a/src/core/unit.c b/src/core/unit.c
index 3bfc2460bc..3356b97522 100644
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -452,6 +452,7 @@ static void unit_free_requires_mounts_for(Unit *u) {
static void unit_done(Unit *u) {
ExecContext *ec;
CGroupContext *cc;
+ int r;
assert(u);
@@ -468,6 +469,10 @@ static void unit_done(Unit *u) {
cc = unit_get_cgroup_context(u);
if (cc)
cgroup_context_done(cc);
+
+ r = unit_remove_from_netclass_cgroup(u);
+ if (r < 0)
+ log_warning_errno(r, "Unable to remove unit from netclass group: %m");
}
void unit_free(Unit *u) {
@@ -1241,6 +1246,14 @@ int unit_load(Unit *u) {
}
unit_update_cgroup_members_masks(u);
+
+ /* If we are reloading, we need to wait for the deserializer
+ * to restore the net_cls ids that have been set previously */
+ if (u->manager->n_reloading <= 0) {
+ r = unit_add_to_netclass_cgroup(u);
+ if (r < 0)
+ return r;
+ }
}
assert((u->load_state != UNIT_MERGED) == !u->merged_into);
@@ -2591,6 +2604,9 @@ int unit_serialize(Unit *u, FILE *f, FDSet *fds, bool serialize_jobs) {
unit_serialize_item(u, f, "cgroup", u->cgroup_path);
unit_serialize_item(u, f, "cgroup-realized", yes_no(u->cgroup_realized));
+ if (u->cgroup_netclass_id)
+ unit_serialize_item_format(u, f, "netclass-id", "%" PRIu32, u->cgroup_netclass_id);
+
if (serialize_jobs) {
if (u->job) {
fprintf(f, "job\n");
@@ -2778,6 +2794,17 @@ int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
u->cgroup_realized = b;
continue;
+ } else if (streq(l, "netclass-id")) {
+ r = safe_atou32(v, &u->cgroup_netclass_id);
+ if (r < 0)
+ log_unit_debug(u, "Failed to parse netclass ID %s, ignoring.", v);
+ else {
+ r = unit_add_to_netclass_cgroup(u);
+ if (r < 0)
+ log_unit_debug_errno(u, r, "Failed to add unit to netclass cgroup, ignoring: %m");
+ }
+
+ continue;
}
if (unit_can_serialize(u)) {
diff --git a/src/core/unit.h b/src/core/unit.h
index 3c7684411b..c868d75c79 100644
--- a/src/core/unit.h
+++ b/src/core/unit.h
@@ -161,6 +161,9 @@ struct Unit {
/* CGroup realize members queue */
LIST_FIELDS(Unit, cgroup_queue);
+ /* Units with the same CGroup netclass */
+ LIST_FIELDS(Unit, cgroup_netclass);
+
/* PIDs we keep an eye on. Note that a unit might have many
* more, but these are the ones we care enough about to
* process SIGCHLD for */
@@ -189,6 +192,8 @@ struct Unit {
CGroupMask cgroup_members_mask;
int cgroup_inotify_wd;
+ uint32_t cgroup_netclass_id;
+
/* How to start OnFailure units */
JobMode on_failure_job_mode;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-09 12:06:32 +0000