cgroup: add socket-bind to cgroup context

src/core/cgroup.c

@@ -200,6 +200,18 @@ void cgroup_context_remove_bpf_foreign_program(CGroupContext *c, CGroupBPFForeig
         free(p);
 }
 
+void cgroup_context_remove_socket_bind(CGroupSocketBindItem **head) {
+        CGroupSocketBindItem *h;
+
+        assert(head);
+
+        while (*head) {
+                h = *head;
+                LIST_REMOVE(socket_bind_items, *head, h);
+                free(h);
+        }
+}
+
 void cgroup_context_done(CGroupContext *c) {
         assert(c);
 
@@ -221,6 +233,9 @@ void cgroup_context_done(CGroupContext *c) {
         while (c->device_allow)
                 cgroup_context_free_device_allow(c, c->device_allow);
 
+        cgroup_context_remove_socket_bind(&c->socket_bind_allow);
+        cgroup_context_remove_socket_bind(&c->socket_bind_deny);
+
         c->ip_address_allow = ip_address_access_free_all(c->ip_address_allow);
         c->ip_address_deny = ip_address_access_free_all(c->ip_address_deny);
 
@@ -376,6 +391,7 @@ void cgroup_context_dump(Unit *u, FILE* f, const char *prefix) {
         CGroupBPFForeignProgram *p;
         CGroupDeviceAllow *a;
         CGroupContext *c;
+        CGroupSocketBindItem *bi;
         IPAddressAccessItem *iaai;
         char **path;
         char q[FORMAT_TIMESPAN_MAX];
@@ -562,6 +578,34 @@ void cgroup_context_dump(Unit *u, FILE* f, const char *prefix) {
         LIST_FOREACH(programs, p, c->bpf_foreign_programs)
                 fprintf(f, "%sBPFProgram: %s:%s",
                         prefix, bpf_cgroup_attach_type_to_string(p->attach_type), p->bpffs_path);
+
+        if (c->socket_bind_allow) {
+                fprintf(f, "%sSocketBindAllow:", prefix);
+                LIST_FOREACH(socket_bind_items, bi, c->socket_bind_allow)
+                        cgroup_context_dump_socket_bind_item(bi, f);
+                fputc('\n', f);
+        }
+
+        if (c->socket_bind_deny) {
+                fprintf(f, "%sSocketBindDeny:", prefix);
+                LIST_FOREACH(socket_bind_items, bi, c->socket_bind_deny)
+                        cgroup_context_dump_socket_bind_item(bi, f);
+                fputc('\n', f);
+        }
+}
+
+void cgroup_context_dump_socket_bind_item(const CGroupSocketBindItem *item, FILE *f) {
+        const char *family = item->address_family == AF_INET ? "IPv4:" :
+                item->address_family == AF_INET6 ? "IPv6:" : "";
+
+        if (item->nr_ports == 0)
+                fprintf(f, " %sany", family);
+        else if (item->nr_ports == 1)
+                fprintf(f, " %s%" PRIu16, family, item->port_min);
+        else {
+                uint16_t port_max = item->port_min + item->nr_ports - 1;
+                fprintf(f, " %s%" PRIu16 "-%" PRIu16, family, item->port_min, port_max);
+        }
 }
 
 int cgroup_add_device_allow(CGroupContext *c, const char *dev, const char *mode) {

src/core/cgroup.h

@@ -32,6 +32,7 @@ typedef struct CGroupIODeviceLatency CGroupIODeviceLatency;
 typedef struct CGroupBlockIODeviceWeight CGroupBlockIODeviceWeight;
 typedef struct CGroupBlockIODeviceBandwidth CGroupBlockIODeviceBandwidth;
 typedef struct CGroupBPFForeignProgram CGroupBPFForeignProgram;
+typedef struct CGroupSocketBindItem CGroupSocketBindItem;
 
 typedef enum CGroupDevicePolicy {
         /* When devices listed, will allow those, plus built-in ones, if none are listed will allow
@@ -101,6 +102,13 @@ struct CGroupBPFForeignProgram {
         char *bpffs_path;
 };
 
+struct CGroupSocketBindItem {
+        LIST_FIELDS(CGroupSocketBindItem, socket_bind_items);
+        int address_family;
+        uint16_t nr_ports;
+        uint16_t port_min;
+};
+
 struct CGroupContext {
         bool cpu_accounting;
         bool io_accounting;
@@ -165,6 +173,9 @@ struct CGroupContext {
         CGroupDevicePolicy device_policy;
         LIST_HEAD(CGroupDeviceAllow, device_allow);
 
+        LIST_HEAD(CGroupSocketBindItem, socket_bind_allow);
+        LIST_HEAD(CGroupSocketBindItem, socket_bind_deny);
+
         /* Common */
         TasksMax tasks_max;
 
@@ -203,6 +214,7 @@ usec_t cgroup_cpu_adjust_period(usec_t period, usec_t quota, usec_t resolution,
 void cgroup_context_init(CGroupContext *c);
 void cgroup_context_done(CGroupContext *c);
 void cgroup_context_dump(Unit *u, FILE* f, const char *prefix);
+void cgroup_context_dump_socket_bind_item(const CGroupSocketBindItem *item, FILE *f);
 
 void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a);
 void cgroup_context_free_io_device_weight(CGroupContext *c, CGroupIODeviceWeight *w);
@@ -211,6 +223,7 @@ void cgroup_context_free_io_device_latency(CGroupContext *c, CGroupIODeviceLaten
 void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w);
 void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b);
 void cgroup_context_remove_bpf_foreign_program(CGroupContext *c, CGroupBPFForeignProgram *p);
+void cgroup_context_remove_socket_bind(CGroupSocketBindItem **head);
 
 int cgroup_add_device_allow(CGroupContext *c, const char *dev, const char *mode);
 int cgroup_add_bpf_foreign_program(CGroupContext *c, uint32_t attach_type, const char *path);