Adding upstream version 247.3.upstream/247.3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 176 insertions, 0 deletions

diff --git a/src/libsystemd/sd-netlink/generic-netlink.c b/src/libsystemd/sd-netlink/generic-netlink.c
new file mode 100644
index 0000000..f295fa9
--- /dev/null
+++ b/src/libsystemd/sd-netlink/generic-netlink.c
@@ -0,0 +1,176 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <linux/genetlink.h>
+
+#include "sd-netlink.h"
+
+#include "alloc-util.h"
+#include "generic-netlink.h"
+#include "netlink-internal.h"
+
+typedef struct {
+        const char* name;
+        uint8_t version;
+} genl_family;
+
+static const genl_family genl_families[] = {
+        [SD_GENL_ID_CTRL]   = { .name = "",          .version = 1 },
+        [SD_GENL_WIREGUARD] = { .name = "wireguard", .version = 1 },
+        [SD_GENL_FOU]       = { .name = "fou",       .version = 1 },
+        [SD_GENL_L2TP]      = { .name = "l2tp",      .version = 1 },
+        [SD_GENL_MACSEC]    = { .name = "macsec",    .version = 1 },
+        [SD_GENL_NL80211]   = { .name = "nl80211",   .version = 1 },
+};
+
+int sd_genl_socket_open(sd_netlink **ret) {
+        return netlink_open_family(ret, NETLINK_GENERIC);
+}
+static int lookup_id(sd_netlink *nl, sd_genl_family family, uint16_t *id);
+
+static int genl_message_new(sd_netlink *nl, sd_genl_family family, uint16_t nlmsg_type, uint8_t cmd, sd_netlink_message **ret) {
+        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
+        const NLType *genl_cmd_type, *nl_type;
+        const NLTypeSystem *type_system;
+        struct genlmsghdr *genl;
+        size_t size;
+        int r;
+
+        assert_return(nl->protocol == NETLINK_GENERIC, -EINVAL);
+
+        r = type_system_get_type(&genl_family_type_system_root, &genl_cmd_type, family);
+        if (r < 0)
+                return r;
+
+        r = message_new_empty(nl, &m);
+        if (r < 0)
+                return r;
+
+        size = NLMSG_SPACE(sizeof(struct genlmsghdr));
+        m->hdr = malloc0(size);
+        if (!m->hdr)
+                return -ENOMEM;
+
+        m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+
+        type_get_type_system(genl_cmd_type, &type_system);
+
+        r = type_system_get_type(type_system, &nl_type, cmd);
+        if (r < 0)
+                return r;
+
+        m->hdr->nlmsg_len = size;
+        m->hdr->nlmsg_type = nlmsg_type;
+
+        type_get_type_system(nl_type, &m->containers[0].type_system);
+        genl = NLMSG_DATA(m->hdr);
+        genl->cmd = cmd;
+        genl->version = genl_families[family].version;
+
+        *ret = TAKE_PTR(m);
+
+        return 0;
+}
+
+int sd_genl_message_new(sd_netlink *nl, sd_genl_family family, uint8_t cmd, sd_netlink_message **ret) {
+        uint16_t id;
+        int r;
+
+        r = lookup_id(nl, family, &id);
+        if (r < 0)
+                return r;
+
+        return genl_message_new(nl, family, id, cmd, ret);
+}
+
+static int lookup_id(sd_netlink *nl, sd_genl_family family, uint16_t *id) {
+        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
+        uint16_t u;
+        void *v;
+        int r;
+
+        if (family == SD_GENL_ID_CTRL) {
+                *id = GENL_ID_CTRL;
+                return 0;
+        }
+
+        v = hashmap_get(nl->genl_family_to_nlmsg_type, INT_TO_PTR(family));
+        if (v) {
+                *id = PTR_TO_UINT(v);
+                return 0;
+        }
+
+        r = sd_genl_message_new(nl, SD_GENL_ID_CTRL, CTRL_CMD_GETFAMILY, &req);
+        if (r < 0)
+                return r;
+
+        r = sd_netlink_message_append_string(req, CTRL_ATTR_FAMILY_NAME, genl_families[family].name);
+        if (r < 0)
+                return r;
+
+        r = sd_netlink_call(nl, req, 0, &reply);
+        if (r < 0)
+                return r;
+
+        r = sd_netlink_message_read_u16(reply, CTRL_ATTR_FAMILY_ID, &u);
+        if (r < 0)
+                return r;
+
+        r = hashmap_ensure_allocated(&nl->genl_family_to_nlmsg_type, NULL);
+        if (r < 0)
+                return r;
+
+        r = hashmap_ensure_allocated(&nl->nlmsg_type_to_genl_family, NULL);
+        if (r < 0)
+                return r;
+
+        r = hashmap_put(nl->genl_family_to_nlmsg_type, INT_TO_PTR(family), UINT_TO_PTR(u));
+        if (r < 0)
+                return r;
+
+        r = hashmap_put(nl->nlmsg_type_to_genl_family, UINT_TO_PTR(u), INT_TO_PTR(family));
+        if (r < 0)
+                return r;
+
+        *id = u;
+        return 0;
+}
+
+int nlmsg_type_to_genl_family(const sd_netlink *nl, uint16_t type, sd_genl_family *ret) {
+        void *p;
+
+        assert_return(nl, -EINVAL);
+        assert_return(nl->protocol == NETLINK_GENERIC, -EINVAL);
+        assert(ret);
+
+        if (type == NLMSG_ERROR)
+                *ret = SD_GENL_ERROR;
+        else if (type == NLMSG_DONE)
+                *ret = SD_GENL_DONE;
+        else if (type == GENL_ID_CTRL)
+                *ret = SD_GENL_ID_CTRL;
+        else {
+                p = hashmap_get(nl->nlmsg_type_to_genl_family, UINT_TO_PTR(type));
+                if (!p)
+                        return -EOPNOTSUPP;
+
+                *ret = PTR_TO_INT(p);
+        }
+
+        return 0;
+}
+
+int sd_genl_message_get_family(const sd_netlink *nl, const sd_netlink_message *m, sd_genl_family *family) {
+        uint16_t type;
+        int r;
+
+        assert_return(m, -EINVAL);
+        assert_return(nl, -EINVAL);
+        assert_return(nl->protocol == NETLINK_GENERIC, -EINVAL);
+        assert_return(family, -EINVAL);
+
+        r = sd_netlink_message_get_type(m, &type);
+        if (r < 0)
+                return r;
+
+        return nlmsg_type_to_genl_family(nl, type, family);
+}