+
+/* Given an inode number of a socket, print out its protocol details. */
+bool
+print_sockaddr_by_inode(struct tcb *const tcp, const int fd,
+ const unsigned long inode)
+{
+ return print_sockaddr_by_inode_cached(inode) ? true :
+ print_sockaddr_by_inode_uncached(tcp, inode,
+ getfdproto(tcp, fd));
+}
+
+#ifdef HAVE_LINUX_GENETLINK_H
+/*
+ * Managing the cache for decoding communications of Netlink GENERIC protocol
+ *
+ * As name shown Netlink GENERIC protocol is generic protocol. The
+ * numbers of msg types used in the protocol are not defined
+ * statically. Kernel defines them on demand. So the xlat converted
+ * from header files doesn't help for decoding the protocol. Following
+ * codes are building xlat(dyxlat) at runtime.
+ */
+static bool
+genl_send_dump_families(struct tcb *tcp, const int fd)
+{
+ struct {
+ const struct nlmsghdr nlh;
+ struct genlmsghdr gnlh;
+ } req = {
+ .nlh = {
+ .nlmsg_len = sizeof(req),
+ .nlmsg_type = GENL_ID_CTRL,
+ .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ },
+ .gnlh = {
+ .cmd = CTRL_CMD_GETFAMILY,
+ }
+ };
+ return send_query(tcp, fd, &req, sizeof(req));
+}
+
+static int
+genl_parse_families_response(const void *const data,
+ const int data_len, const unsigned long inode,
+ void *opaque_data)
+{
+ struct dyxlat *const dyxlat = opaque_data;
+ const struct genlmsghdr *const gnlh = data;
+ struct rtattr *attr;
+ int rta_len = data_len - NLMSG_LENGTH(sizeof(*gnlh));
+
+ char *name = NULL;
+ unsigned int name_len = 0;
+ uint16_t *id = NULL;
+
+ if (rta_len < 0)
+ return -1;
+ if (gnlh->cmd != CTRL_CMD_NEWFAMILY)
+ return -1;
+ if (gnlh->version != 2)
+ return -1;
+
+ for (attr = (struct rtattr *) (gnlh + 1);
+ RTA_OK(attr, rta_len);
+ attr = RTA_NEXT(attr, rta_len)) {
+ switch (attr->rta_type) {
+ case CTRL_ATTR_FAMILY_NAME:
+ if (!name) {
+ name = RTA_DATA(attr);
+ name_len = RTA_PAYLOAD(attr);
+ }
+ break;
+ case CTRL_ATTR_FAMILY_ID:
+ if (!id && RTA_PAYLOAD(attr) == sizeof(*id))
+ id = RTA_DATA(attr);
+ break;
+ }
+
+ if (name && id) {
+ dyxlat_add_pair(dyxlat, *id, name, name_len);
+ name = NULL;
+ id = NULL;
+ }
+ }
+
+ return 0;
+}
+
+const struct xlat *
+genl_families_xlat(struct tcb *tcp)
+{
+ static struct dyxlat *dyxlat;
+
+ if (!dyxlat) {
+ dyxlat = dyxlat_alloc(32);
+
+ int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
+ if (fd < 0)
+ goto out;
+
+ if (genl_send_dump_families(tcp, fd))
+ receive_responses(tcp, fd, 0, GENL_ID_CTRL,
+ genl_parse_families_response, dyxlat);
+ close(fd);
+ }
+
+out:
+ return dyxlat_get(dyxlat);
+}
+
+#else /* !HAVE_LINUX_GENETLINK_H */
+
+const struct xlat *
+genl_families_xlat(struct tcb *tcp)
+{
+ return NULL;
+}
+#endif