Adding upstream version 255.4.upstream/255.4

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

1 files changed, 214 insertions, 0 deletions

diff --git a/src/nspawn/nspawn-expose-ports.c b/src/nspawn/nspawn-expose-ports.c
new file mode 100644
index 0000000..5644068
--- /dev/null
+++ b/src/nspawn/nspawn-expose-ports.c
@@ -0,0 +1,214 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "sd-netlink.h"
+
+#include "af-list.h"
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "firewall-util.h"
+#include "in-addr-util.h"
+#include "local-addresses.h"
+#include "netlink-util.h"
+#include "nspawn-expose-ports.h"
+#include "parse-util.h"
+#include "socket-util.h"
+#include "string-util.h"
+
+int expose_port_parse(ExposePort **l, const char *s) {
+        const char *split, *e;
+        uint16_t container_port, host_port;
+        ExposePort *port;
+        int protocol;
+        int r;
+
+        assert(l);
+        assert(s);
+
+        if ((e = startswith(s, "tcp:")))
+                protocol = IPPROTO_TCP;
+        else if ((e = startswith(s, "udp:")))
+                protocol = IPPROTO_UDP;
+        else {
+                e = s;
+                protocol = IPPROTO_TCP;
+        }
+
+        split = strchr(e, ':');
+        if (split) {
+                char v[split - e + 1];
+
+                memcpy(v, e, split - e);
+                v[split - e] = 0;
+
+                r = parse_ip_port(v, &host_port);
+                if (r < 0)
+                        return -EINVAL;
+
+                r = parse_ip_port(split + 1, &container_port);
+        } else {
+                r = parse_ip_port(e, &container_port);
+                host_port = container_port;
+        }
+
+        if (r < 0)
+                return r;
+
+        LIST_FOREACH(ports, p, *l)
+                if (p->protocol == protocol && p->host_port == host_port)
+                        return -EEXIST;
+
+        port = new(ExposePort, 1);
+        if (!port)
+                return -ENOMEM;
+
+        *port = (ExposePort) {
+                .protocol = protocol,
+                .host_port = host_port,
+                .container_port = container_port,
+        };
+
+        LIST_PREPEND(ports, *l, port);
+
+        return 0;
+}
+
+void expose_port_free_all(ExposePort *p) {
+        LIST_CLEAR(ports, p, free);
+}
+
+int expose_port_flush(FirewallContext **fw_ctx, ExposePort* l, int af, union in_addr_union *exposed) {
+        int r;
+
+        assert(exposed);
+
+        if (!l)
+                return 0;
+
+        if (!in_addr_is_set(af, exposed))
+                return 0;
+
+        log_debug("Lost IP address.");
+
+        LIST_FOREACH(ports, p, l) {
+                r = fw_add_local_dnat(fw_ctx,
+                                      false,
+                                      af,
+                                      p->protocol,
+                                      p->host_port,
+                                      exposed,
+                                      p->container_port,
+                                      NULL);
+                if (r < 0)
+                        log_warning_errno(r, "Failed to modify %s firewall: %m", af_to_name(af));
+        }
+
+        *exposed = IN_ADDR_NULL;
+        return 0;
+}
+
+int expose_port_execute(sd_netlink *rtnl, FirewallContext **fw_ctx, ExposePort *l, int af, union in_addr_union *exposed) {
+        _cleanup_free_ struct local_address *addresses = NULL;
+        union in_addr_union new_exposed;
+        bool add;
+        int r;
+
+        assert(exposed);
+
+        /* Invoked each time an address is added or removed inside the
+         * container */
+
+        if (!l)
+                return 0;
+
+        r = local_addresses(rtnl, 0, af, &addresses);
+        if (r < 0)
+                return log_error_errno(r, "Failed to enumerate local addresses: %m");
+
+        add = r > 0 &&
+                addresses[0].family == af &&
+                addresses[0].scope < RT_SCOPE_LINK;
+
+        if (!add)
+                return expose_port_flush(fw_ctx, l, af, exposed);
+
+        new_exposed = addresses[0].address;
+        if (in_addr_equal(af, exposed, &new_exposed))
+                return 0;
+
+        log_debug("New container IP is %s.", IN_ADDR_TO_STRING(af, &new_exposed));
+
+        LIST_FOREACH(ports, p, l) {
+                r = fw_add_local_dnat(fw_ctx,
+                                      true,
+                                      af,
+                                      p->protocol,
+                                      p->host_port,
+                                      &new_exposed,
+                                      p->container_port,
+                                      in_addr_is_set(af, exposed) ? exposed : NULL);
+                if (r < 0)
+                        log_warning_errno(r, "Failed to modify %s firewall: %m", af_to_name(af));
+        }
+
+        *exposed = new_exposed;
+        return 0;
+}
+
+int expose_port_send_rtnl(int send_fd) {
+        _cleanup_close_ int fd = -EBADF;
+        int r;
+
+        assert(send_fd >= 0);
+
+        fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_ROUTE);
+        if (fd < 0)
+                return log_error_errno(errno, "Failed to allocate container netlink: %m");
+
+        /* Store away the fd in the socket, so that it stays open as
+         * long as we run the child */
+        r = send_one_fd(send_fd, fd, 0);
+        if (r < 0)
+                return log_error_errno(r, "Failed to send netlink fd: %m");
+
+        return 0;
+}
+
+int expose_port_watch_rtnl(
+                sd_event *event,
+                int recv_fd,
+                sd_netlink_message_handler_t handler,
+                void *userdata,
+                sd_netlink **ret) {
+        _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
+        int fd, r;
+
+        assert(event);
+        assert(recv_fd >= 0);
+        assert(ret);
+
+        fd = receive_one_fd(recv_fd, 0);
+        if (fd < 0)
+                return log_error_errno(fd, "Failed to recv netlink fd: %m");
+
+        r = sd_netlink_open_fd(&rtnl, fd);
+        if (r < 0) {
+                safe_close(fd);
+                return log_error_errno(r, "Failed to create rtnl object: %m");
+        }
+
+        r = sd_netlink_add_match(rtnl, NULL, RTM_NEWADDR, handler, NULL, userdata, "nspawn-NEWADDR");
+        if (r < 0)
+                return log_error_errno(r, "Failed to subscribe to RTM_NEWADDR messages: %m");
+
+        r = sd_netlink_add_match(rtnl, NULL, RTM_DELADDR, handler, NULL, userdata, "nspawn-DELADDR");
+        if (r < 0)
+                return log_error_errno(r, "Failed to subscribe to RTM_DELADDR messages: %m");
+
+        r = sd_netlink_attach_event(rtnl, event, 0);
+        if (r < 0)
+                return log_error_errno(r, "Failed to add to event loop: %m");
+
+        *ret = TAKE_PTR(rtnl);
+
+        return 0;
+}