Merge pull request #5529 from ssahani/label

networkd / sd-netlink: add support for address label

1 files changed, 257 insertions, 0 deletions

diff --git a/src/network/networkd-address-label.c b/src/network/networkd-address-label.c
new file mode 100644
index 0000000000..1248719cf3
--- /dev/null
+++ b/src/network/networkd-address-label.c
@@ -0,0 +1,257 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2017 Susant Sahani
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <net/if.h>
+#include <linux/if_addrlabel.h>
+
+#include "alloc-util.h"
+#include "conf-parser.h"
+#include "networkd-address-label.h"
+#include "netlink-util.h"
+#include "networkd-manager.h"
+#include "parse-util.h"
+#include "socket-util.h"
+
+int address_label_new(AddressLabel **ret) {
+        _cleanup_address_label_free_ AddressLabel *addrlabel = NULL;
+
+        addrlabel = new0(AddressLabel, 1);
+        if (!addrlabel)
+                return -ENOMEM;
+
+        *ret = addrlabel;
+        addrlabel = NULL;
+
+        return 0;
+}
+
+void address_label_free(AddressLabel *label) {
+        if (!label)
+                return;
+
+        if (label->network) {
+                LIST_REMOVE(labels, label->network->address_labels, label);
+                assert(label->network->n_address_labels > 0);
+                label->network->n_address_labels--;
+
+                if (label->section) {
+                        hashmap_remove(label->network->address_labels_by_section, label->section);
+                        network_config_section_free(label->section);
+                }
+        }
+
+        free(label);
+}
+
+static int address_label_new_static(Network *network, const char *filename, unsigned section_line, AddressLabel **ret) {
+        _cleanup_network_config_section_free_ NetworkConfigSection *n = NULL;
+        _cleanup_address_label_free_ AddressLabel *label = NULL;
+        int r;
+
+        assert(network);
+        assert(ret);
+        assert(!!filename == (section_line > 0));
+
+        r = network_config_section_new(filename, section_line, &n);
+        if (r < 0)
+                return r;
+
+        label = hashmap_get(network->address_labels_by_section, n);
+        if (label) {
+                *ret = label;
+                label = NULL;
+
+                return 0;
+        }
+
+        r = address_label_new(&label);
+        if (r < 0)
+                return r;
+
+        label->section = n;
+        n = NULL;
+
+        r = hashmap_put(network->address_labels_by_section, label->section, label);
+        if (r < 0)
+                return r;
+
+        label->network = network;
+        LIST_APPEND(labels, network->address_labels, label);
+        network->n_address_labels++;
+
+        *ret = label;
+        label = NULL;
+
+        return 0;
+}
+
+int address_label_configure(
+                AddressLabel *label,
+                Link *link,
+                sd_netlink_message_handler_t callback,
+                bool update) {
+
+        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
+        int r;
+
+        assert(label);
+        assert(link);
+        assert(link->ifindex > 0);
+        assert(link->manager);
+        assert(link->manager->rtnl);
+
+        r = sd_rtnl_message_new_addrlabel(link->manager->rtnl, &req, RTM_NEWADDRLABEL,
+                                          link->ifindex, label->family);
+        if (r < 0)
+                return log_error_errno(r, "Could not allocate RTM_NEWADDR message: %m");
+
+        r = sd_rtnl_message_addrlabel_set_prefixlen(req, label->prefixlen);
+        if (r < 0)
+                return log_error_errno(r, "Could not set prefixlen: %m");
+
+        r = sd_netlink_message_append_u32(req, IFAL_LABEL, label->label);
+        if (r < 0)
+                return log_error_errno(r, "Could not append IFAL_LABEL attribute: %m");
+
+        r = sd_netlink_message_append_in6_addr(req, IFA_ADDRESS, &label->in_addr.in6);
+        if (r < 0)
+                return log_error_errno(r, "Could not append IFA_ADDRESS attribute: %m");
+
+        r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
+        if (r < 0)
+                return log_error_errno(r, "Could not send rtnetlink message: %m");
+
+        link_ref(link);
+
+        return 0;
+}
+
+int config_parse_address_label_prefix(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) {
+
+        _cleanup_address_label_free_ AddressLabel *n = NULL;
+        Network *network = userdata;
+        const char *prefix, *e;
+        union in_addr_union buffer;
+        int r, f;
+
+        assert(filename);
+        assert(section);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = address_label_new_static(network, filename, section_line, &n);
+        if (r < 0)
+                return r;
+
+        /* AddressLabel=prefix/prefixlen */
+
+        /* prefixlen */
+        e = strchr(rvalue, '/');
+        if (e) {
+                unsigned i;
+
+                r = safe_atou(e + 1, &i);
+                if (r < 0) {
+                        log_syntax(unit, LOG_ERR, filename, line, r, "Prefix length is invalid, ignoring assignment: %s", e + 1);
+                        return 0;
+                }
+
+                if (i > 128) {
+                        log_syntax(unit, LOG_ERR, filename, line, r, "Prefix length is out of range, ignoring assignment: %s", e + 1);
+                        return 0;
+                }
+
+                n->prefixlen = (unsigned char) i;
+
+                prefix = strndupa(rvalue, e - rvalue);
+        } else
+                prefix = rvalue;
+
+        r = in_addr_from_string_auto(prefix, &f, &buffer);
+        if (r < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, r, "Address label is invalid, ignoring assignment: %s", prefix);
+                return 0;
+        }
+
+        if (f != AF_INET6) {
+                log_syntax(unit, LOG_ERR, filename, line, 0, "Address label family is not IPv6, ignoring assignment: %s", prefix);
+                return 0;
+        }
+
+        n->family = f;
+        n->in_addr = buffer;
+
+        n = NULL;
+
+        return 0;
+}
+
+int config_parse_address_label(
+                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) {
+
+        _cleanup_address_label_free_ AddressLabel *n = NULL;
+        Network *network = userdata;
+        uint32_t k;
+        int r;
+
+        assert(filename);
+        assert(section);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = address_label_new_static(network, filename, section_line, &n);
+        if (r < 0)
+                return r;
+
+        r = safe_atou32(rvalue, &k);
+        if (r < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse address label, ignoring: %s", rvalue);
+                return 0;
+        }
+
+        if (k == 0xffffffffUL) {
+                log_syntax(unit, LOG_ERR, filename, line, r, "Adress label is invalid, ignoring: %s", rvalue);
+                return 0;
+        }
+
+        n->label = k;
+        n = NULL;
+
+        return 0;
+}