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-rw-r--r--src/libsystemd/rtnl-internal.h99
-rw-r--r--src/libsystemd/rtnl-message.c887
-rw-r--r--src/libsystemd/rtnl-util.c100
-rw-r--r--src/libsystemd/rtnl-util.h36
-rw-r--r--src/libsystemd/sd-rtnl.c870
-rw-r--r--src/libsystemd/test-rtnl.c330
6 files changed, 2322 insertions, 0 deletions
diff --git a/src/libsystemd/rtnl-internal.h b/src/libsystemd/rtnl-internal.h
new file mode 100644
index 0000000000..2e0b7b8f37
--- /dev/null
+++ b/src/libsystemd/rtnl-internal.h
@@ -0,0 +1,99 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Tom Gundersen <teg@jklm.no>
+
+ 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 <linux/netlink.h>
+
+#include "refcnt.h"
+#include "prioq.h"
+#include "list.h"
+
+#include "sd-rtnl.h"
+
+struct reply_callback {
+ sd_rtnl_message_handler_t callback;
+ void *userdata;
+ usec_t timeout;
+ uint64_t serial;
+ unsigned prioq_idx;
+};
+
+struct match_callback {
+ sd_rtnl_message_handler_t callback;
+ uint16_t type;
+ void *userdata;
+
+ LIST_FIELDS(struct match_callback, match_callbacks);
+};
+
+struct sd_rtnl {
+ RefCount n_ref;
+
+ int fd;
+
+ union {
+ struct sockaddr sa;
+ struct sockaddr_nl nl;
+ } sockaddr;
+
+ sd_rtnl_message **rqueue;
+ unsigned rqueue_size;
+
+ sd_rtnl_message **wqueue;
+ unsigned wqueue_size;
+
+ bool processing:1;
+
+ uint32_t serial;
+
+ struct Prioq *reply_callbacks_prioq;
+ Hashmap *reply_callbacks;
+
+ LIST_HEAD(struct match_callback, match_callbacks);
+
+ pid_t original_pid;
+
+ sd_event_source *io_event_source;
+ sd_event_source *time_event_source;
+ sd_event_source *exit_event_source;
+ sd_event *event;
+};
+
+#define RTNL_DEFAULT_TIMEOUT ((usec_t) (10 * USEC_PER_SEC))
+
+#define RTNL_WQUEUE_MAX 1024
+#define RTNL_RQUEUE_MAX 64*1024
+
+int message_new_synthetic_error(int error, uint32_t serial, sd_rtnl_message **ret);
+uint32_t message_get_serial(sd_rtnl_message *m);
+int message_seal(sd_rtnl *nl, sd_rtnl_message *m);
+
+bool message_type_is_link(uint16_t type);
+bool message_type_is_addr(uint16_t type);
+bool message_type_is_route(uint16_t type);
+
+int socket_write_message(sd_rtnl *nl, sd_rtnl_message *m);
+int socket_read_message(sd_rtnl *nl, sd_rtnl_message **ret);
+
+/* Make sure callbacks don't destroy the rtnl connection */
+#define RTNL_DONT_DESTROY(rtnl) \
+ _cleanup_sd_rtnl_unref_ _unused_ sd_rtnl *_dont_destroy_##rtnl = sd_rtnl_ref(rtnl)
diff --git a/src/libsystemd/rtnl-message.c b/src/libsystemd/rtnl-message.c
new file mode 100644
index 0000000000..517df61156
--- /dev/null
+++ b/src/libsystemd/rtnl-message.c
@@ -0,0 +1,887 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Tom Gundersen <teg@jklm.no>
+
+ 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 <linux/rtnetlink.h>
+#include <netinet/in.h>
+#include <netinet/ether.h>
+#include <stdbool.h>
+#include <unistd.h>
+
+#include "util.h"
+#include "refcnt.h"
+
+#include "sd-rtnl.h"
+#include "rtnl-internal.h"
+
+struct sd_rtnl_message {
+ RefCount n_ref;
+
+ struct nlmsghdr *hdr;
+ size_t container_offset; /* offset from hdr to container start */
+ size_t next_rta_offset; /* offset from hdr to next rta */
+
+ bool sealed:1;
+};
+
+#define CURRENT_CONTAINER(m) ((m)->container_offset ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offset) : NULL)
+#define NEXT_RTA(m) ((struct rtattr*)((uint8_t*)(m)->hdr + (m)->next_rta_offset))
+#define UPDATE_RTA(m, new) (m)->next_rta_offset = (uint8_t*)(new) - (uint8_t*)(m)->hdr;
+
+static int message_new(sd_rtnl_message **ret, size_t initial_size) {
+ sd_rtnl_message *m;
+
+ assert_return(ret, -EINVAL);
+ assert_return(initial_size >= sizeof(struct nlmsghdr), -EINVAL);
+
+ m = new0(sd_rtnl_message, 1);
+ if (!m)
+ return -ENOMEM;
+
+ m->hdr = malloc0(initial_size);
+ if (!m->hdr) {
+ free(m);
+ return -ENOMEM;
+ }
+
+ m->n_ref = REFCNT_INIT;
+
+ m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+ m->sealed = false;
+
+ *ret = m;
+
+ return 0;
+}
+
+int message_new_synthetic_error(int error, uint32_t serial, sd_rtnl_message **ret) {
+ struct nlmsgerr *err;
+ int r;
+
+ assert(error <= 0);
+
+ r = message_new(ret, NLMSG_SPACE(sizeof(struct nlmsgerr)));
+ if (r < 0)
+ return r;
+
+ (*ret)->hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
+ (*ret)->hdr->nlmsg_type = NLMSG_ERROR;
+ (*ret)->hdr->nlmsg_seq = serial;
+
+ err = NLMSG_DATA((*ret)->hdr);
+
+ err->error = error;
+
+ return 0;
+}
+
+bool message_type_is_route(uint16_t type) {
+ switch (type) {
+ case RTM_NEWROUTE:
+ case RTM_GETROUTE:
+ case RTM_DELROUTE:
+ return true;
+ default:
+ return false;
+ }
+}
+
+bool message_type_is_link(uint16_t type) {
+ switch (type) {
+ case RTM_NEWLINK:
+ case RTM_SETLINK:
+ case RTM_GETLINK:
+ case RTM_DELLINK:
+ return true;
+ default:
+ return false;
+ }
+}
+
+bool message_type_is_addr(uint16_t type) {
+ switch (type) {
+ case RTM_NEWADDR:
+ case RTM_GETADDR:
+ case RTM_DELADDR:
+ return true;
+ default:
+ return false;
+ }
+}
+
+int sd_rtnl_message_route_set_dst_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) {
+ struct rtmsg *rtm;
+
+ rtm = NLMSG_DATA(m->hdr);
+
+ rtm->rtm_dst_len = prefixlen;
+
+ return 0;
+}
+
+int sd_rtnl_message_route_new(uint16_t nlmsg_type, unsigned char rtm_family,
+ sd_rtnl_message **ret) {
+ struct rtmsg *rtm;
+ int r;
+
+ assert_return(message_type_is_route(nlmsg_type), -EINVAL);
+ assert_return(rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL);
+ assert_return(ret, -EINVAL);
+
+ r = message_new(ret, NLMSG_SPACE(sizeof(struct rtmsg)));
+ if (r < 0)
+ return r;
+
+ (*ret)->hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
+ (*ret)->hdr->nlmsg_type = nlmsg_type;
+ if (nlmsg_type == RTM_NEWROUTE)
+ (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
+
+ rtm = NLMSG_DATA((*ret)->hdr);
+
+ UPDATE_RTA(*ret, RTM_RTA(rtm));
+
+ rtm->rtm_family = rtm_family;
+ rtm->rtm_scope = RT_SCOPE_UNIVERSE;
+ rtm->rtm_type = RTN_UNICAST;
+ rtm->rtm_table = RT_TABLE_MAIN;
+ rtm->rtm_protocol = RTPROT_BOOT;
+
+ return 0;
+}
+
+int sd_rtnl_message_link_set_flags(sd_rtnl_message *m, unsigned flags) {
+ struct ifinfomsg *ifi;
+
+ ifi = NLMSG_DATA(m->hdr);
+
+ ifi->ifi_flags = flags;
+
+ return 0;
+}
+
+int sd_rtnl_message_link_set_type(sd_rtnl_message *m, unsigned type) {
+ struct ifinfomsg *ifi;
+
+ ifi = NLMSG_DATA(m->hdr);
+
+ ifi->ifi_type = type;
+
+ return 0;
+}
+
+int sd_rtnl_message_link_new(uint16_t nlmsg_type, int index, sd_rtnl_message **ret) {
+ struct ifinfomsg *ifi;
+ int r;
+
+ assert_return(message_type_is_link(nlmsg_type), -EINVAL);
+ assert_return(nlmsg_type == RTM_NEWLINK || index > 0, -EINVAL);
+ assert_return(ret, -EINVAL);
+
+ r = message_new(ret, NLMSG_SPACE(sizeof(struct ifinfomsg)));
+ if (r < 0)
+ return r;
+
+ (*ret)->hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+ (*ret)->hdr->nlmsg_type = nlmsg_type;
+ if (nlmsg_type == RTM_NEWLINK)
+ (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE;
+
+ ifi = NLMSG_DATA((*ret)->hdr);
+
+ ifi->ifi_family = AF_UNSPEC;
+ ifi->ifi_index = index;
+ ifi->ifi_change = 0xffffffff;
+
+ UPDATE_RTA(*ret, IFLA_RTA(ifi));
+
+ return 0;
+}
+
+int sd_rtnl_message_addr_new(uint16_t nlmsg_type, int index, unsigned char family, unsigned char prefixlen, unsigned char flags, unsigned char scope, sd_rtnl_message **ret) {
+ struct ifaddrmsg *ifa;
+ int r;
+
+ assert_return(message_type_is_addr(nlmsg_type), -EINVAL);
+ assert_return(index > 0, -EINVAL);
+ assert_return(ret, -EINVAL);
+
+ r = message_new(ret, NLMSG_SPACE(sizeof(struct ifaddrmsg)));
+ if (r < 0)
+ return r;
+
+ (*ret)->hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
+ (*ret)->hdr->nlmsg_type = nlmsg_type;
+
+ ifa = NLMSG_DATA((*ret)->hdr);
+
+ ifa->ifa_family = family;
+ ifa->ifa_prefixlen = prefixlen;
+ ifa->ifa_flags = flags;
+ ifa->ifa_scope = scope;
+ ifa->ifa_index = index;
+
+ UPDATE_RTA(*ret, IFA_RTA(ifa));
+
+ return 0;
+}
+
+sd_rtnl_message *sd_rtnl_message_ref(sd_rtnl_message *m) {
+ if (m)
+ assert_se(REFCNT_INC(m->n_ref) >= 2);
+
+ return m;
+}
+
+sd_rtnl_message *sd_rtnl_message_unref(sd_rtnl_message *m) {
+ if (m && REFCNT_DEC(m->n_ref) <= 0) {
+ free(m->hdr);
+ free(m);
+ }
+
+ return NULL;
+}
+
+int sd_rtnl_message_get_type(sd_rtnl_message *m, uint16_t *type) {
+ assert_return(m, -EINVAL);
+ assert_return(type, -EINVAL);
+
+ *type = m->hdr->nlmsg_type;
+
+ return 0;
+}
+
+int sd_rtnl_message_link_get_ifindex(sd_rtnl_message *m, int *ifindex) {
+ struct ifinfomsg *ifi;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(ifindex, -EINVAL);
+
+ ifi = NLMSG_DATA(m->hdr);
+
+ *ifindex = ifi->ifi_index;
+
+ return 0;
+}
+
+int sd_rtnl_message_link_get_flags(sd_rtnl_message *m, unsigned *flags) {
+ struct ifinfomsg *ifi;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
+ assert_return(flags, -EINVAL);
+
+ ifi = NLMSG_DATA(m->hdr);
+
+ *flags = ifi->ifi_flags;
+
+ return 0;
+}
+
+/* If successful the updated message will be correctly aligned, if
+ unsuccessful the old message is untouched. */
+static int add_rtattr(sd_rtnl_message *m, unsigned short type, const void *data, size_t data_length) {
+ uint32_t rta_length, message_length;
+ struct nlmsghdr *new_hdr;
+ struct rtattr *rta;
+ char *padding;
+
+ assert(m);
+ assert(m->hdr);
+ assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len);
+ assert(!data || data_length > 0);
+
+ /* get the size of the new rta attribute (with padding at the end) */
+ rta_length = RTA_LENGTH(data_length);
+
+ /* get the new message size (with padding at the end) */
+ message_length = m->hdr->nlmsg_len + RTA_ALIGN(rta_length);
+
+ /* realloc to fit the new attribute */
+ new_hdr = realloc(m->hdr, message_length);
+ if (!new_hdr)
+ return -ENOMEM;
+ m->hdr = new_hdr;
+
+ /* get pointer to the attribute we are about to add */
+ rta = (struct rtattr *) ((uint8_t *) m->hdr + m->hdr->nlmsg_len);
+
+ /* if we are inside a container, extend it */
+ if (CURRENT_CONTAINER(m))
+ CURRENT_CONTAINER(m)->rta_len += message_length - m->hdr->nlmsg_len;
+
+ /* fill in the attribute */
+ rta->rta_type = type;
+ rta->rta_len = rta_length;
+ if (!data) {
+ /* this is the start of a new container */
+ m->container_offset = m->hdr->nlmsg_len;
+ } else {
+ /* we don't deal with the case where the user lies about the type
+ * and gives us too little data (so don't do that)
+ */
+ padding = mempcpy(RTA_DATA(rta), data, data_length);
+ /* make sure also the padding at the end of the message is initialized */
+ memzero(padding,
+ (uint8_t *) m->hdr + message_length - (uint8_t *) padding);
+ }
+
+ /* update message size */
+ m->hdr->nlmsg_len = message_length;
+
+ return 0;
+}
+
+int sd_rtnl_message_append_string(sd_rtnl_message *m, unsigned short type, const char *data) {
+ uint16_t rtm_type;
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(data, -EINVAL);
+
+ r = sd_rtnl_message_get_type(m, &rtm_type);
+ if (r < 0)
+ return r;
+
+ /* check that the type is correct */
+ switch (rtm_type) {
+ case RTM_NEWLINK:
+ case RTM_SETLINK:
+ case RTM_GETLINK:
+ case RTM_DELLINK:
+ if (CURRENT_CONTAINER(m)) {
+ if (CURRENT_CONTAINER(m)->rta_type != IFLA_LINKINFO ||
+ type != IFLA_INFO_KIND)
+ return -ENOTSUP;
+ } else {
+ switch (type) {
+ case IFLA_IFNAME:
+ case IFLA_IFALIAS:
+ case IFLA_QDISC:
+ break;
+ default:
+ return -ENOTSUP;
+ }
+ }
+ break;
+ case RTM_NEWADDR:
+ case RTM_GETADDR:
+ case RTM_DELADDR:
+ if (type != IFA_LABEL)
+ return -ENOTSUP;
+ break;
+ default:
+ return -ENOTSUP;
+ }
+
+ r = add_rtattr(m, type, data, strlen(data) + 1);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int sd_rtnl_message_append_u32(sd_rtnl_message *m, unsigned short type, uint32_t data) {
+ uint16_t rtm_type;
+ int r;
+
+ assert_return(m, -EINVAL);
+
+ r = sd_rtnl_message_get_type(m, &rtm_type);
+ if (r < 0)
+ return r;
+
+ /* check that the type is correct */
+ switch (rtm_type) {
+ case RTM_NEWLINK:
+ case RTM_SETLINK:
+ case RTM_GETLINK:
+ case RTM_DELLINK:
+ switch (type) {
+ case IFLA_MASTER:
+ case IFLA_MTU:
+ case IFLA_LINK:
+ break;
+ default:
+ return -ENOTSUP;
+ }
+ break;
+ case RTM_NEWROUTE:
+ case RTM_GETROUTE:
+ case RTM_DELROUTE:
+ switch (type) {
+ case RTA_TABLE:
+ case RTA_PRIORITY:
+ case RTA_IIF:
+ case RTA_OIF:
+ break;
+ default:
+ return -ENOTSUP;
+ }
+ break;
+ default:
+ return -ENOTSUP;
+ }
+
+ r = add_rtattr(m, type, &data, sizeof(uint32_t));
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int sd_rtnl_message_append_in_addr(sd_rtnl_message *m, unsigned short type, const struct in_addr *data) {
+ struct ifaddrmsg *ifa;
+ struct rtmsg *rtm;
+ uint16_t rtm_type;
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(data, -EINVAL);
+
+ r = sd_rtnl_message_get_type(m, &rtm_type);
+ if (r < 0)
+ return r;
+
+ /* check that the type is correct */
+ switch (rtm_type) {
+ case RTM_NEWADDR:
+ case RTM_GETADDR:
+ case RTM_DELADDR:
+ switch (type) {
+ case IFA_ADDRESS:
+ case IFA_LOCAL:
+ case IFA_BROADCAST:
+ case IFA_ANYCAST:
+ ifa = NLMSG_DATA(m->hdr);
+
+ if (ifa->ifa_family != AF_INET)
+ return -EINVAL;
+
+ break;
+ default:
+ return -ENOTSUP;
+ }
+ break;
+ case RTM_NEWROUTE:
+ case RTM_GETROUTE:
+ case RTM_DELROUTE:
+ switch (type) {
+ case RTA_DST:
+ case RTA_SRC:
+ case RTA_GATEWAY:
+ rtm = NLMSG_DATA(m->hdr);
+
+ if (rtm->rtm_family != AF_INET)
+ return -EINVAL;
+
+ break;
+ default:
+ return -ENOTSUP;
+ }
+ break;
+ default:
+ return -ENOTSUP;
+ }
+
+ r = add_rtattr(m, type, data, sizeof(struct in_addr));
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int sd_rtnl_message_append_in6_addr(sd_rtnl_message *m, unsigned short type, const struct in6_addr *data) {
+ struct ifaddrmsg *ifa;
+ struct rtmsg *rtm;
+ uint16_t rtm_type;
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(data, -EINVAL);
+
+ r = sd_rtnl_message_get_type(m, &rtm_type);
+ if (r < 0)
+ return r;
+
+ /* check that the type is correct */
+ switch (rtm_type) {
+ case RTM_NEWADDR:
+ case RTM_GETADDR:
+ case RTM_DELADDR:
+ switch (type) {
+ case IFA_ADDRESS:
+ case IFA_LOCAL:
+ case IFA_BROADCAST:
+ case IFA_ANYCAST:
+ ifa = NLMSG_DATA(m->hdr);
+
+ if (ifa->ifa_family != AF_INET6)
+ return -EINVAL;
+
+ break;
+ default:
+ return -ENOTSUP;
+ }
+ break;
+ case RTM_NEWROUTE:
+ case RTM_GETROUTE:
+ case RTM_DELROUTE:
+ switch (type) {
+ case RTA_DST:
+ case RTA_SRC:
+ case RTA_GATEWAY:
+ rtm = NLMSG_DATA(m->hdr);
+
+ if (rtm->rtm_family != AF_INET6)
+ return -EINVAL;
+
+ break;
+ default:
+ return -ENOTSUP;
+ }
+ default:
+ return -ENOTSUP;
+ }
+
+ r = add_rtattr(m, type, data, sizeof(struct in6_addr));
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int sd_rtnl_message_append_ether_addr(sd_rtnl_message *m, unsigned short type, const struct ether_addr *data) {
+ uint16_t rtm_type;
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return(data, -EINVAL);
+
+ sd_rtnl_message_get_type(m, &rtm_type);
+
+ switch (rtm_type) {
+ case RTM_NEWLINK:
+ case RTM_SETLINK:
+ case RTM_DELLINK:
+ case RTM_GETLINK:
+ switch (type) {
+ case IFLA_ADDRESS:
+ case IFLA_BROADCAST:
+ break;
+ default:
+ return -ENOTSUP;
+ }
+ break;
+ default:
+ return -ENOTSUP;
+ }
+
+ r = add_rtattr(m, type, data, ETH_ALEN);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int sd_rtnl_message_open_container(sd_rtnl_message *m, unsigned short type) {
+ uint16_t rtm_type;
+
+ assert_return(m, -EINVAL);
+ assert_return(!CURRENT_CONTAINER(m), -EINVAL);
+
+ sd_rtnl_message_get_type(m, &rtm_type);
+
+ if (message_type_is_link(rtm_type)) {
+ if (type == IFLA_LINKINFO)
+ return add_rtattr(m, type, NULL, 0);
+ else
+ return -ENOTSUP;
+ } else
+ return -ENOTSUP;
+
+ return 0;
+}
+
+int sd_rtnl_message_close_container(sd_rtnl_message *m) {
+ assert_return(m, -EINVAL);
+ assert_return(CURRENT_CONTAINER(m), -EINVAL);
+
+ m->container_offset = 0;
+
+ return 0;
+}
+
+int sd_rtnl_message_read(sd_rtnl_message *m, unsigned short *type, void **data) {
+ size_t remaining_size;
+ uint16_t rtm_type;
+ int r;
+
+ assert(m);
+ assert(m->next_rta_offset);
+ assert(type);
+ assert(data);
+
+ remaining_size = m->hdr->nlmsg_len - m->next_rta_offset;
+
+ if (!RTA_OK(NEXT_RTA(m), remaining_size))
+ return 0;
+
+ /* make sure we don't try to read a container
+ * TODO: add support for entering containers for reading */
+ r = sd_rtnl_message_get_type(m, &rtm_type);
+ if (r < 0)
+ return r;
+
+ if (message_type_is_link(rtm_type) &&
+ NEXT_RTA(m)->rta_type == IFLA_LINKINFO)
+ return -EINVAL;
+
+ *data = RTA_DATA(NEXT_RTA(m));
+ *type = NEXT_RTA(m)->rta_type;
+
+ UPDATE_RTA(m, RTA_NEXT(NEXT_RTA(m), remaining_size));
+
+ return 1;
+}
+
+uint32_t message_get_serial(sd_rtnl_message *m) {
+ assert(m);
+ assert(m->hdr);
+
+ return m->hdr->nlmsg_seq;
+}
+
+int sd_rtnl_message_get_errno(sd_rtnl_message *m) {
+ struct nlmsgerr *err;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+
+ if (m->hdr->nlmsg_type != NLMSG_ERROR)
+ return 0;
+
+ err = NLMSG_DATA(m->hdr);
+
+ return err->error;
+}
+
+int message_seal(sd_rtnl *nl, sd_rtnl_message *m) {
+ assert(nl);
+ assert(m);
+ assert(m->hdr);
+
+ if (m->sealed)
+ return -EPERM;
+
+ m->hdr->nlmsg_seq = nl->serial++;
+ m->sealed = true;
+
+ return 0;
+}
+
+static int message_receive_need(sd_rtnl *rtnl, size_t *need) {
+ assert(rtnl);
+ assert(need);
+
+ /* ioctl(rtnl->fd, FIONREAD, &need)
+ Does not appear to work on netlink sockets. libnl uses
+ MSG_PEEK instead. I don't know if that is worth the
+ extra roundtrip.
+
+ For now we simply use the maximum message size the kernel
+ may use (NLMSG_GOODSIZE), and then realloc to the actual
+ size after reading the message (hence avoiding huge memory
+ usage in case many small messages are kept around) */
+ *need = page_size();
+ if (*need > 8192UL)
+ *need = 8192UL;
+
+ return 0;
+}
+
+/* returns the number of bytes sent, or a negative error code */
+int socket_write_message(sd_rtnl *nl, sd_rtnl_message *m) {
+ union {
+ struct sockaddr sa;
+ struct sockaddr_nl nl;
+ } addr = {
+ .nl.nl_family = AF_NETLINK,
+ };
+ ssize_t k;
+
+ assert(nl);
+ assert(m);
+ assert(m->hdr);
+
+ k = sendto(nl->fd, m->hdr, m->hdr->nlmsg_len,
+ 0, &addr.sa, sizeof(addr));
+ if (k < 0)
+ return (errno == EAGAIN) ? 0 : -errno;
+
+ return k;
+}
+
+/* On success, the number of bytes received is returned and *ret points to the received message
+ * which has a valid header and the correct size.
+ * If nothing useful was received 0 is returned.
+ * On failure, a negative error code is returned.
+ */
+int socket_read_message(sd_rtnl *nl, sd_rtnl_message **ret) {
+ sd_rtnl_message *m;
+ union {
+ struct sockaddr sa;
+ struct sockaddr_nl nl;
+ } addr;
+ socklen_t addr_len;
+ int r;
+ ssize_t k;
+ size_t need;
+
+ assert(nl);
+ assert(ret);
+
+ r = message_receive_need(nl, &need);
+ if (r < 0)
+ return r;
+
+ r = message_new(&m, need);
+ if (r < 0)
+ return r;
+
+ addr_len = sizeof(addr);
+
+ k = recvfrom(nl->fd, m->hdr, need,
+ 0, &addr.sa, &addr_len);
+ if (k < 0)
+ k = (errno == EAGAIN) ? 0 : -errno; /* no data */
+ else if (k == 0)
+ k = -ECONNRESET; /* connection was closed by the kernel */
+ else if (addr_len != sizeof(addr.nl) ||
+ addr.nl.nl_family != AF_NETLINK)
+ k = -EIO; /* not a netlink message */
+ else if (addr.nl.nl_pid != 0)
+ k = 0; /* not from the kernel */
+ else if ((size_t) k < sizeof(struct nlmsghdr) ||
+ (size_t) k < m->hdr->nlmsg_len)
+ k = -EIO; /* too small (we do accept too big though) */
+ else if (m->hdr->nlmsg_pid && m->hdr->nlmsg_pid != nl->sockaddr.nl.nl_pid)
+ k = 0; /* not broadcast and not for us */
+
+ if (k > 0)
+ switch (m->hdr->nlmsg_type) {
+ struct ifinfomsg *ifi;
+ struct ifaddrmsg *ifa;
+ struct rtmsg *rtm;
+
+ /* check that the size matches the message type */
+ case NLMSG_ERROR:
+ if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
+ k = -EIO;
+ break;
+ case RTM_NEWLINK:
+ case RTM_SETLINK:
+ case RTM_DELLINK:
+ case RTM_GETLINK:
+ if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifinfomsg)))
+ k = -EIO;
+ else {
+ ifi = NLMSG_DATA(m->hdr);
+ UPDATE_RTA(m, IFLA_RTA(ifi));
+ }
+ break;
+ case RTM_NEWADDR:
+ case RTM_DELADDR:
+ case RTM_GETADDR:
+ if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifaddrmsg)))
+ k = -EIO;
+ else {
+ ifa = NLMSG_DATA(m->hdr);
+ UPDATE_RTA(m, IFA_RTA(ifa));
+ }
+ break;
+ case RTM_NEWROUTE:
+ case RTM_DELROUTE:
+ case RTM_GETROUTE:
+ if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtmsg)))
+ k = -EIO;
+ else {
+ rtm = NLMSG_DATA(m->hdr);
+ UPDATE_RTA(m, RTM_RTA(rtm));
+ }
+ break;
+ case NLMSG_NOOP:
+ k = 0;
+ break;
+ default:
+ k = 0; /* ignoring message of unknown type */
+ }
+
+ if (k <= 0)
+ sd_rtnl_message_unref(m);
+ else {
+ /* we probably allocated way too much memory, give it back */
+ m->hdr = realloc(m->hdr, m->hdr->nlmsg_len);
+ *ret = m;
+ }
+
+ return k;
+}
+
+int sd_rtnl_message_rewind(sd_rtnl_message *m) {
+ struct ifinfomsg *ifi;
+ struct ifaddrmsg *ifa;
+ struct rtmsg *rtm;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+
+ switch(m->hdr->nlmsg_type) {
+ case RTM_NEWLINK:
+ case RTM_SETLINK:
+ case RTM_GETLINK:
+ case RTM_DELLINK:
+ ifi = NLMSG_DATA(m->hdr);
+ UPDATE_RTA(m, IFLA_RTA(ifi));
+
+ break;
+ case RTM_NEWADDR:
+ case RTM_GETADDR:
+ case RTM_DELADDR:
+ ifa = NLMSG_DATA(m->hdr);
+ UPDATE_RTA(m, IFA_RTA(ifa));
+
+ break;
+ case RTM_NEWROUTE:
+ case RTM_GETROUTE:
+ case RTM_DELROUTE:
+ rtm = NLMSG_DATA(m->hdr);
+ UPDATE_RTA(m, RTM_RTA(rtm));
+
+ break;
+ default:
+ return -ENOTSUP;
+ }
+
+ return 0;
+}
diff --git a/src/libsystemd/rtnl-util.c b/src/libsystemd/rtnl-util.c
new file mode 100644
index 0000000000..dfc0050def
--- /dev/null
+++ b/src/libsystemd/rtnl-util.c
@@ -0,0 +1,100 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
+
+ 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 <linux/rtnetlink.h>
+#include <netinet/ether.h>
+
+#include "sd-rtnl.h"
+
+#include "rtnl-util.h"
+
+int rtnl_set_link_name(sd_rtnl *rtnl, int ifindex, const char *name) {
+ _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *message = NULL;
+ int r;
+
+ assert(rtnl);
+ assert(ifindex > 0);
+ assert(name);
+
+ r = sd_rtnl_message_link_new(RTM_SETLINK, ifindex, &message);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_message_append_string(message, IFLA_IFNAME, name);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_call(rtnl, message, 0, NULL);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int rtnl_set_link_properties(sd_rtnl *rtnl, int ifindex, const char *alias,
+ const struct ether_addr *mac, unsigned mtu) {
+ _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *message = NULL;
+ bool need_update = false;
+ int r;
+
+ assert(rtnl);
+ assert(ifindex > 0);
+
+ if (!alias && !mac && mtu == 0)
+ return 0;
+
+ r = sd_rtnl_message_link_new(RTM_SETLINK, ifindex, &message);
+ if (r < 0)
+ return r;
+
+ if (alias) {
+ r = sd_rtnl_message_append_string(message, IFLA_IFALIAS, alias);
+ if (r < 0)
+ return r;
+
+ need_update = true;
+
+ }
+
+ if (mac) {
+ r = sd_rtnl_message_append_ether_addr(message, IFLA_ADDRESS, mac);
+ if (r < 0)
+ return r;
+
+ need_update = true;
+ }
+
+ if (mtu > 0) {
+ r = sd_rtnl_message_append_u32(message, IFLA_MTU, mtu);
+ if (r < 0)
+ return r;
+
+ need_update = true;
+ }
+
+ if (need_update) {
+ r = sd_rtnl_call(rtnl, message, 0, NULL);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
diff --git a/src/libsystemd/rtnl-util.h b/src/libsystemd/rtnl-util.h
new file mode 100644
index 0000000000..013002dd60
--- /dev/null
+++ b/src/libsystemd/rtnl-util.h
@@ -0,0 +1,36 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
+
+ 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 <netinet/ether.h>
+
+#include "util.h"
+#include "sd-rtnl.h"
+
+int rtnl_set_link_name(sd_rtnl *rtnl, int ifindex, const char *name);
+int rtnl_set_link_properties(sd_rtnl *rtnl, int ifindex, const char *alias, const struct ether_addr *mac, unsigned mtu);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(sd_rtnl*, sd_rtnl_unref);
+DEFINE_TRIVIAL_CLEANUP_FUNC(sd_rtnl_message*, sd_rtnl_message_unref);
+
+#define _cleanup_sd_rtnl_unref_ _cleanup_(sd_rtnl_unrefp)
+#define _cleanup_sd_rtnl_message_unref_ _cleanup_(sd_rtnl_message_unrefp)
diff --git a/src/libsystemd/sd-rtnl.c b/src/libsystemd/sd-rtnl.c
new file mode 100644
index 0000000000..08b82ab2a9
--- /dev/null
+++ b/src/libsystemd/sd-rtnl.c
@@ -0,0 +1,870 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Tom Gundersen <teg@jklm.no>
+
+ 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 <sys/socket.h>
+#include <poll.h>
+
+#include "macro.h"
+#include "util.h"
+#include "hashmap.h"
+
+#include "sd-rtnl.h"
+#include "rtnl-internal.h"
+#include "rtnl-util.h"
+
+static int sd_rtnl_new(sd_rtnl **ret) {
+ sd_rtnl *rtnl;
+
+ assert_return(ret, -EINVAL);
+
+ rtnl = new0(sd_rtnl, 1);
+ if (!rtnl)
+ return -ENOMEM;
+
+ rtnl->n_ref = REFCNT_INIT;
+
+ rtnl->fd = -1;
+
+ rtnl->sockaddr.nl.nl_family = AF_NETLINK;
+
+ rtnl->original_pid = getpid();
+
+ LIST_HEAD_INIT(rtnl->match_callbacks);
+
+ /* We guarantee that wqueue always has space for at least
+ * one entry */
+ rtnl->wqueue = new(sd_rtnl_message*, 1);
+ if (!rtnl->wqueue) {
+ free(rtnl);
+ return -ENOMEM;
+ }
+
+ *ret = rtnl;
+ return 0;
+}
+
+static bool rtnl_pid_changed(sd_rtnl *rtnl) {
+ assert(rtnl);
+
+ /* We don't support people creating an rtnl connection and
+ * keeping it around over a fork(). Let's complain. */
+
+ return rtnl->original_pid != getpid();
+}
+
+int sd_rtnl_open(uint32_t groups, sd_rtnl **ret) {
+ _cleanup_sd_rtnl_unref_ sd_rtnl *rtnl = NULL;
+ socklen_t addrlen;
+ int r;
+
+ assert_return(ret, -EINVAL);
+
+ r = sd_rtnl_new(&rtnl);
+ if (r < 0)
+ return r;
+
+ rtnl->fd = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_ROUTE);
+ if (rtnl->fd < 0)
+ return -errno;
+
+ rtnl->sockaddr.nl.nl_groups = groups;
+
+ addrlen = sizeof(rtnl->sockaddr);
+
+ r = bind(rtnl->fd, &rtnl->sockaddr.sa, addrlen);
+ if (r < 0)
+ return -errno;
+
+ r = getsockname(rtnl->fd, &rtnl->sockaddr.sa, &addrlen);
+ if (r < 0)
+ return r;
+
+ *ret = rtnl;
+ rtnl = NULL;
+
+ return 0;
+}
+
+sd_rtnl *sd_rtnl_ref(sd_rtnl *rtnl) {
+ if (rtnl)
+ assert_se(REFCNT_INC(rtnl->n_ref) >= 2);
+
+ return rtnl;
+}
+
+sd_rtnl *sd_rtnl_unref(sd_rtnl *rtnl) {
+
+ if (rtnl && REFCNT_DEC(rtnl->n_ref) <= 0) {
+ struct match_callback *f;
+ unsigned i;
+
+ for (i = 0; i < rtnl->rqueue_size; i++)
+ sd_rtnl_message_unref(rtnl->rqueue[i]);
+ free(rtnl->rqueue);
+
+ for (i = 0; i < rtnl->wqueue_size; i++)
+ sd_rtnl_message_unref(rtnl->wqueue[i]);
+ free(rtnl->wqueue);
+
+ hashmap_free_free(rtnl->reply_callbacks);
+ prioq_free(rtnl->reply_callbacks_prioq);
+
+ while ((f = rtnl->match_callbacks)) {
+ LIST_REMOVE(match_callbacks, rtnl->match_callbacks, f);
+ free(f);
+ }
+
+ if (rtnl->fd >= 0)
+ close_nointr_nofail(rtnl->fd);
+
+ free(rtnl);
+ }
+
+ return NULL;
+}
+
+int sd_rtnl_send(sd_rtnl *nl,
+ sd_rtnl_message *message,
+ uint32_t *serial) {
+ int r;
+
+ assert_return(nl, -EINVAL);
+ assert_return(!rtnl_pid_changed(nl), -ECHILD);
+ assert_return(message, -EINVAL);
+
+ r = message_seal(nl, message);
+ if (r < 0)
+ return r;
+
+ if (nl->wqueue_size <= 0) {
+ /* send directly */
+ r = socket_write_message(nl, message);
+ if (r < 0)
+ return r;
+ else if (r == 0) {
+ /* nothing was sent, so let's put it on
+ * the queue */
+ nl->wqueue[0] = sd_rtnl_message_ref(message);
+ nl->wqueue_size = 1;
+ }
+ } else {
+ sd_rtnl_message **q;
+
+ /* append to queue */
+ if (nl->wqueue_size >= RTNL_WQUEUE_MAX)
+ return -ENOBUFS;
+
+ q = realloc(nl->wqueue, sizeof(sd_rtnl_message*) * (nl->wqueue_size + 1));
+ if (!q)
+ return -ENOMEM;
+
+ nl->wqueue = q;
+ q[nl->wqueue_size ++] = sd_rtnl_message_ref(message);
+ }
+
+ if (serial)
+ *serial = message_get_serial(message);
+
+ return 1;
+}
+
+static int dispatch_rqueue(sd_rtnl *rtnl, sd_rtnl_message **message) {
+ sd_rtnl_message *z = NULL;
+ int r;
+
+ assert(rtnl);
+ assert(message);
+
+ if (rtnl->rqueue_size > 0) {
+ /* Dispatch a queued message */
+
+ *message = rtnl->rqueue[0];
+ rtnl->rqueue_size --;
+ memmove(rtnl->rqueue, rtnl->rqueue + 1, sizeof(sd_rtnl_message*) * rtnl->rqueue_size);
+
+ return 1;
+ }
+
+ /* Try to read a new message */
+ r = socket_read_message(rtnl, &z);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return 0;
+
+ *message = z;
+
+ return 1;
+}
+
+static int dispatch_wqueue(sd_rtnl *rtnl) {
+ int r, ret = 0;
+
+ assert(rtnl);
+
+ while (rtnl->wqueue_size > 0) {
+ r = socket_write_message(rtnl, rtnl->wqueue[0]);
+ if (r < 0)
+ return r;
+ else if (r == 0)
+ /* Didn't do anything this time */
+ return ret;
+ else {
+ /* see equivalent in sd-bus.c */
+ sd_rtnl_message_unref(rtnl->wqueue[0]);
+ rtnl->wqueue_size --;
+ memmove(rtnl->wqueue, rtnl->wqueue + 1, sizeof(sd_rtnl_message*) * rtnl->wqueue_size);
+
+ ret = 1;
+ }
+ }
+
+ return ret;
+}
+
+static int process_timeout(sd_rtnl *rtnl) {
+ _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *m = NULL;
+ struct reply_callback *c;
+ usec_t n;
+ int r;
+
+ assert(rtnl);
+
+ c = prioq_peek(rtnl->reply_callbacks_prioq);
+ if (!c)
+ return 0;
+
+ n = now(CLOCK_MONOTONIC);
+ if (c->timeout > n)
+ return 0;
+
+ r = message_new_synthetic_error(-ETIMEDOUT, c->serial, &m);
+ if (r < 0)
+ return r;
+
+ assert_se(prioq_pop(rtnl->reply_callbacks_prioq) == c);
+ hashmap_remove(rtnl->reply_callbacks, &c->serial);
+
+ r = c->callback(rtnl, m, c->userdata);
+ free(c);
+
+ return r < 0 ? r : 1;
+}
+
+static int process_reply(sd_rtnl *rtnl, sd_rtnl_message *m) {
+ struct reply_callback *c;
+ uint64_t serial;
+ int r;
+
+ assert(rtnl);
+ assert(m);
+
+ serial = message_get_serial(m);
+ c = hashmap_remove(rtnl->reply_callbacks, &serial);
+ if (!c)
+ return 0;
+
+ if (c->timeout != 0)
+ prioq_remove(rtnl->reply_callbacks_prioq, c, &c->prioq_idx);
+
+ r = c->callback(rtnl, m, c->userdata);
+ free(c);
+
+ return r;
+}
+
+static int process_match(sd_rtnl *rtnl, sd_rtnl_message *m) {
+ struct match_callback *c;
+ uint16_t type;
+ int r;
+
+ assert(rtnl);
+ assert(m);
+
+ r = sd_rtnl_message_get_type(m, &type);
+ if (r < 0)
+ return r;
+
+ LIST_FOREACH(match_callbacks, c, rtnl->match_callbacks) {
+ if (type == c->type) {
+ r = c->callback(rtnl, m, c->userdata);
+ if (r != 0)
+ return r;
+ }
+ }
+
+ return 0;
+}
+
+static int process_running(sd_rtnl *rtnl, sd_rtnl_message **ret) {
+ _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *m = NULL;
+ int r;
+
+ assert(rtnl);
+
+ r = process_timeout(rtnl);
+ if (r != 0)
+ goto null_message;
+
+ r = dispatch_wqueue(rtnl);
+ if (r != 0)
+ goto null_message;
+
+ r = dispatch_rqueue(rtnl, &m);
+ if (r < 0)
+ return r;
+ if (!m)
+ goto null_message;
+
+ r = process_reply(rtnl, m);
+ if (r != 0)
+ goto null_message;
+
+ r = process_match(rtnl, m);
+ if (r != 0)
+ goto null_message;
+
+ if (ret) {
+ *ret = m;
+ m = NULL;
+
+ return 1;
+ }
+
+ return 1;
+
+null_message:
+ if (r >= 0 && ret)
+ *ret = NULL;
+
+ return r;
+}
+
+int sd_rtnl_process(sd_rtnl *rtnl, sd_rtnl_message **ret) {
+ RTNL_DONT_DESTROY(rtnl);
+ int r;
+
+ assert_return(rtnl, -EINVAL);
+ assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
+ assert_return(!rtnl->processing, -EBUSY);
+
+ rtnl->processing = true;
+ r = process_running(rtnl, ret);
+ rtnl->processing = false;
+
+ return r;
+}
+
+static usec_t calc_elapse(uint64_t usec) {
+ if (usec == (uint64_t) -1)
+ return 0;
+
+ if (usec == 0)
+ usec = RTNL_DEFAULT_TIMEOUT;
+
+ return now(CLOCK_MONOTONIC) + usec;
+}
+
+static int rtnl_poll(sd_rtnl *rtnl, bool need_more, uint64_t timeout_usec) {
+ struct pollfd p[1] = {};
+ struct timespec ts;
+ usec_t m = (usec_t) -1;
+ int r, e;
+
+ assert(rtnl);
+
+ e = sd_rtnl_get_events(rtnl);
+ if (e < 0)
+ return e;
+
+ if (need_more)
+ /* Caller wants more data, and doesn't care about
+ * what's been read or any other timeouts. */
+ return e |= POLLIN;
+ else {
+ usec_t until;
+ /* Caller wants to process if there is something to
+ * process, but doesn't care otherwise */
+
+ r = sd_rtnl_get_timeout(rtnl, &until);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ usec_t nw;
+ nw = now(CLOCK_MONOTONIC);
+ m = until > nw ? until - nw : 0;
+ }
+ }
+
+ if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m))
+ m = timeout_usec;
+
+ p[0].fd = rtnl->fd;
+ p[0].events = e;
+
+ r = ppoll(p, 1, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL);
+ if (r < 0)
+ return -errno;
+
+ return r > 0 ? 1 : 0;
+}
+
+int sd_rtnl_wait(sd_rtnl *nl, uint64_t timeout_usec) {
+ assert_return(nl, -EINVAL);
+ assert_return(!rtnl_pid_changed(nl), -ECHILD);
+
+ if (nl->rqueue_size > 0)
+ return 0;
+
+ return rtnl_poll(nl, false, timeout_usec);
+}
+
+static int timeout_compare(const void *a, const void *b) {
+ const struct reply_callback *x = a, *y = b;
+
+ if (x->timeout != 0 && y->timeout == 0)
+ return -1;
+
+ if (x->timeout == 0 && y->timeout != 0)
+ return 1;
+
+ if (x->timeout < y->timeout)
+ return -1;
+
+ if (x->timeout > y->timeout)
+ return 1;
+
+ return 0;
+}
+
+int sd_rtnl_call_async(sd_rtnl *nl,
+ sd_rtnl_message *m,
+ sd_rtnl_message_handler_t callback,
+ void *userdata,
+ uint64_t usec,
+ uint32_t *serial) {
+ struct reply_callback *c;
+ uint32_t s;
+ int r, k;
+
+ assert_return(nl, -EINVAL);
+ assert_return(m, -EINVAL);
+ assert_return(callback, -EINVAL);
+ assert_return(!rtnl_pid_changed(nl), -ECHILD);
+
+ r = hashmap_ensure_allocated(&nl->reply_callbacks, uint64_hash_func, uint64_compare_func);
+ if (r < 0)
+ return r;
+
+ if (usec != (uint64_t) -1) {
+ r = prioq_ensure_allocated(&nl->reply_callbacks_prioq, timeout_compare);
+ if (r < 0)
+ return r;
+ }
+
+ c = new0(struct reply_callback, 1);
+ if (!c)
+ return -ENOMEM;
+
+ c->callback = callback;
+ c->userdata = userdata;
+ c->timeout = calc_elapse(usec);
+
+ k = sd_rtnl_send(nl, m, &s);
+ if (k < 0) {
+ free(c);
+ return k;
+ }
+
+ c->serial = s;
+
+ r = hashmap_put(nl->reply_callbacks, &c->serial, c);
+ if (r < 0) {
+ free(c);
+ return r;
+ }
+
+ if (c->timeout != 0) {
+ r = prioq_put(nl->reply_callbacks_prioq, c, &c->prioq_idx);
+ if (r > 0) {
+ c->timeout = 0;
+ sd_rtnl_call_async_cancel(nl, c->serial);
+ return r;
+ }
+ }
+
+ if (serial)
+ *serial = s;
+
+ return k;
+}
+
+int sd_rtnl_call_async_cancel(sd_rtnl *nl, uint32_t serial) {
+ struct reply_callback *c;
+ uint64_t s = serial;
+
+ assert_return(nl, -EINVAL);
+ assert_return(serial != 0, -EINVAL);
+ assert_return(!rtnl_pid_changed(nl), -ECHILD);
+
+ c = hashmap_remove(nl->reply_callbacks, &s);
+ if (!c)
+ return 0;
+
+ if (c->timeout != 0)
+ prioq_remove(nl->reply_callbacks_prioq, c, &c->prioq_idx);
+
+ free(c);
+ return 1;
+}
+
+int sd_rtnl_call(sd_rtnl *nl,
+ sd_rtnl_message *message,
+ uint64_t usec,
+ sd_rtnl_message **ret) {
+ usec_t timeout;
+ uint32_t serial;
+ bool room = false;
+ int r;
+
+ assert_return(nl, -EINVAL);
+ assert_return(!rtnl_pid_changed(nl), -ECHILD);
+ assert_return(message, -EINVAL);
+
+ r = sd_rtnl_send(nl, message, &serial);
+ if (r < 0)
+ return r;
+
+ timeout = calc_elapse(usec);
+
+ for (;;) {
+ usec_t left;
+ _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *incoming = NULL;
+
+ if (!room) {
+ sd_rtnl_message **q;
+
+ if (nl->rqueue_size >= RTNL_RQUEUE_MAX)
+ return -ENOBUFS;
+
+ /* Make sure there's room for queueing this
+ * locally, before we read the message */
+
+ q = realloc(nl->rqueue, (nl->rqueue_size + 1) * sizeof(sd_rtnl_message*));
+ if (!q)
+ return -ENOMEM;
+
+ nl->rqueue = q;
+ room = true;
+ }
+
+ r = socket_read_message(nl, &incoming);
+ if (r < 0)
+ return r;
+ if (incoming) {
+ uint32_t received_serial = message_get_serial(incoming);
+
+ if (received_serial == serial) {
+ r = sd_rtnl_message_get_errno(incoming);
+ if (r < 0)
+ return r;
+
+ if (ret) {
+ *ret = incoming;
+ incoming = NULL;
+ }
+
+ return 1;
+ }
+
+ /* Room was allocated on the queue above */
+ nl->rqueue[nl->rqueue_size ++] = incoming;
+ incoming = NULL;
+ room = false;
+
+ /* Try to read more, right away */
+ continue;
+ }
+ if (r != 0)
+ continue;
+
+ if (timeout > 0) {
+ usec_t n;
+
+ n = now(CLOCK_MONOTONIC);
+ if (n >= timeout)
+ return -ETIMEDOUT;
+
+ left = timeout - n;
+ } else
+ left = (uint64_t) -1;
+
+ r = rtnl_poll(nl, true, left);
+ if (r < 0)
+ return r;
+
+ r = dispatch_wqueue(nl);
+ if (r < 0)
+ return r;
+ }
+}
+
+int sd_rtnl_flush(sd_rtnl *rtnl) {
+ int r;
+
+ assert_return(rtnl, -EINVAL);
+ assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
+
+ if (rtnl->wqueue_size <= 0)
+ return 0;
+
+ for (;;) {
+ r = dispatch_wqueue(rtnl);
+ if (r < 0)
+ return r;
+
+ if (rtnl->wqueue_size <= 0)
+ return 0;
+
+ r = rtnl_poll(rtnl, false, (uint64_t) -1);
+ if (r < 0)
+ return r;
+ }
+}
+
+int sd_rtnl_get_events(sd_rtnl *rtnl) {
+ int flags = 0;
+
+ assert_return(rtnl, -EINVAL);
+ assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
+
+ if (rtnl->rqueue_size <= 0)
+ flags |= POLLIN;
+ if (rtnl->wqueue_size > 0)
+ flags |= POLLOUT;
+
+ return flags;
+}
+
+int sd_rtnl_get_timeout(sd_rtnl *rtnl, uint64_t *timeout_usec) {
+ struct reply_callback *c;
+
+ assert_return(rtnl, -EINVAL);
+ assert_return(timeout_usec, -EINVAL);
+ assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
+
+ if (rtnl->rqueue_size > 0) {
+ *timeout_usec = 0;
+ return 1;
+ }
+
+ c = prioq_peek(rtnl->reply_callbacks_prioq);
+ if (!c) {
+ *timeout_usec = (uint64_t) -1;
+ return 0;
+ }
+
+ *timeout_usec = c->timeout;
+
+ return 1;
+}
+
+static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ sd_rtnl *rtnl = userdata;
+ int r;
+
+ assert(rtnl);
+
+ r = sd_rtnl_process(rtnl, NULL);
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
+ sd_rtnl *rtnl = userdata;
+ int r;
+
+ assert(rtnl);
+
+ r = sd_rtnl_process(rtnl, NULL);
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+static int prepare_callback(sd_event_source *s, void *userdata) {
+ sd_rtnl *rtnl = userdata;
+ int r, e;
+ usec_t until;
+
+ assert(s);
+ assert(rtnl);
+
+ e = sd_rtnl_get_events(rtnl);
+ if (e < 0)
+ return e;
+
+ r = sd_event_source_set_io_events(rtnl->io_event_source, e);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_get_timeout(rtnl, &until);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ int j;
+
+ j = sd_event_source_set_time(rtnl->time_event_source, until);
+ if (j < 0)
+ return j;
+ }
+
+ r = sd_event_source_set_enabled(rtnl->time_event_source, r > 0);
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+static int exit_callback(sd_event_source *event, void *userdata) {
+ sd_rtnl *rtnl = userdata;
+
+ assert(event);
+
+ sd_rtnl_flush(rtnl);
+
+ return 1;
+}
+
+int sd_rtnl_attach_event(sd_rtnl *rtnl, sd_event *event, int priority) {
+ int r;
+
+ assert_return(rtnl, -EINVAL);
+ assert_return(!rtnl->event, -EBUSY);
+
+ assert(!rtnl->io_event_source);
+ assert(!rtnl->time_event_source);
+
+ if (event)
+ rtnl->event = sd_event_ref(event);
+ else {
+ r = sd_event_default(&rtnl->event);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_event_add_io(rtnl->event, rtnl->fd, 0, io_callback, rtnl, &rtnl->io_event_source);
+ if (r < 0)
+ goto fail;
+
+ r = sd_event_source_set_priority(rtnl->io_event_source, priority);
+ if (r < 0)
+ goto fail;
+
+ r = sd_event_source_set_prepare(rtnl->io_event_source, prepare_callback);
+ if (r < 0)
+ goto fail;
+
+ r = sd_event_add_monotonic(rtnl->event, 0, 0, time_callback, rtnl, &rtnl->time_event_source);
+ if (r < 0)
+ goto fail;
+
+ r = sd_event_source_set_priority(rtnl->time_event_source, priority);
+ if (r < 0)
+ goto fail;
+
+ r = sd_event_add_exit(rtnl->event, exit_callback, rtnl, &rtnl->exit_event_source);
+ if (r < 0)
+ goto fail;
+
+ return 0;
+
+fail:
+ sd_rtnl_detach_event(rtnl);
+ return r;
+}
+
+int sd_rtnl_detach_event(sd_rtnl *rtnl) {
+ assert_return(rtnl, -EINVAL);
+ assert_return(rtnl->event, -ENXIO);
+
+ if (rtnl->io_event_source)
+ rtnl->io_event_source = sd_event_source_unref(rtnl->io_event_source);
+
+ if (rtnl->time_event_source)
+ rtnl->time_event_source = sd_event_source_unref(rtnl->time_event_source);
+
+ if (rtnl->exit_event_source)
+ rtnl->exit_event_source = sd_event_source_unref(rtnl->exit_event_source);
+
+ if (rtnl->event)
+ rtnl->event = sd_event_unref(rtnl->event);
+
+ return 0;
+}
+
+int sd_rtnl_add_match(sd_rtnl *rtnl,
+ uint16_t type,
+ sd_rtnl_message_handler_t callback,
+ void *userdata) {
+ struct match_callback *c;
+
+ assert_return(rtnl, -EINVAL);
+ assert_return(callback, -EINVAL);
+ assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
+ assert_return(message_type_is_link(type) || message_type_is_addr(type) || message_type_is_route(type), -ENOTSUP);
+
+ c = new0(struct match_callback, 1);
+ if (!c)
+ return -ENOMEM;
+
+ c->callback = callback;
+ c->type = type;
+ c->userdata = userdata;
+
+ LIST_PREPEND(match_callbacks, rtnl->match_callbacks, c);
+
+ return 0;
+}
+
+int sd_rtnl_remove_match(sd_rtnl *rtnl,
+ uint16_t type,
+ sd_rtnl_message_handler_t callback,
+ void *userdata) {
+ struct match_callback *c;
+
+ assert_return(rtnl, -EINVAL);
+ assert_return(callback, -EINVAL);
+ assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
+
+ LIST_FOREACH(match_callbacks, c, rtnl->match_callbacks)
+ if (c->callback == callback && c->type == type && c->userdata == userdata) {
+ LIST_REMOVE(match_callbacks, rtnl->match_callbacks, c);
+ free(c);
+
+ return 1;
+ }
+
+ return 0;
+}
diff --git a/src/libsystemd/test-rtnl.c b/src/libsystemd/test-rtnl.c
new file mode 100644
index 0000000000..58654e990a
--- /dev/null
+++ b/src/libsystemd/test-rtnl.c
@@ -0,0 +1,330 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Tom Gundersen <teg@jklm.no>
+
+ 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 <linux/rtnetlink.h>
+#include <netinet/ether.h>
+
+#include "util.h"
+#include "macro.h"
+#include "sd-rtnl.h"
+#include "socket-util.h"
+#include "rtnl-util.h"
+#include "event-util.h"
+
+static void test_link_configure(sd_rtnl *rtnl, int ifindex) {
+ _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *message;
+ uint16_t type;
+ const char *mac = "98:fe:94:3f:c6:18", *name = "test";
+ unsigned int mtu = 1450;
+ void *data;
+
+ /* we'd really like to test NEWLINK, but let's not mess with the running kernel */
+ assert(sd_rtnl_message_link_new(RTM_GETLINK, ifindex, &message) >= 0);
+ assert(sd_rtnl_message_append_string(message, IFLA_IFNAME, name) >= 0);
+ assert(sd_rtnl_message_append_ether_addr(message, IFLA_ADDRESS, ether_aton(mac)) >= 0);
+ assert(sd_rtnl_message_append_u32(message, IFLA_MTU, mtu) >= 0);
+
+ assert(sd_rtnl_message_read(message, &type, &data) > 0);
+ assert(type == IFLA_IFNAME);
+ assert(streq(name, (char *) data));
+
+ assert(sd_rtnl_message_read(message, &type, &data) > 0);
+ assert(type == IFLA_ADDRESS);
+ assert(streq(mac, ether_ntoa(data)));
+
+ assert(sd_rtnl_message_read(message, &type, &data) > 0);
+ assert(type == IFLA_MTU);
+ assert(mtu == *(unsigned int *) data);
+
+ assert(sd_rtnl_call(rtnl, message, 0, NULL) == 1);
+}
+
+static void test_route(void) {
+ _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req;
+ struct in_addr addr;
+ uint32_t index = 2;
+ uint16_t type;
+ void *data;
+ int r;
+
+ r = sd_rtnl_message_route_new(RTM_NEWROUTE, AF_INET, &req);
+ if (r < 0) {
+ log_error("Could not create RTM_NEWROUTE message: %s", strerror(-r));
+ return;
+ }
+
+ addr.s_addr = htonl(INADDR_LOOPBACK);
+
+ r = sd_rtnl_message_append_in_addr(req, RTA_GATEWAY, &addr);
+ if (r < 0) {
+ log_error("Could not append RTA_GATEWAY attribute: %s", strerror(-r));
+ return;
+ }
+
+ r = sd_rtnl_message_append_u32(req, RTA_OIF, index);
+ if (r < 0) {
+ log_error("Could not append RTA_OIF attribute: %s", strerror(-r));
+ return;
+ }
+
+ assert(sd_rtnl_message_read(req, &type, &data) > 0);
+ assert(type == RTA_GATEWAY);
+ assert(((struct in_addr *)data)->s_addr == addr.s_addr);
+
+ assert(sd_rtnl_message_read(req, &type, &data) > 0);
+ assert(type == RTA_OIF);
+ assert(*(uint32_t *) data == index);
+}
+
+static void test_multiple(void) {
+ sd_rtnl *rtnl1, *rtnl2;
+
+ assert(sd_rtnl_open(0, &rtnl1) >= 0);
+ assert(sd_rtnl_open(0, &rtnl2) >= 0);
+
+ rtnl1 = sd_rtnl_unref(rtnl1);
+ rtnl2 = sd_rtnl_unref(rtnl2);
+}
+
+static int link_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
+ void *data;
+ uint16_t type;
+ char *ifname = userdata;
+
+ assert(rtnl);
+ assert(m);
+
+ log_info("got link info about %s", ifname);
+ free(ifname);
+
+ while (sd_rtnl_message_read(m, &type, &data) > 0) {
+ switch (type) {
+// case IFLA_MTU:
+// assert(*(unsigned int *) data == 65536);
+// break;
+// case IFLA_QDISC:
+// assert(streq((char *) data, "noqueue"));
+// break;
+ case IFLA_IFNAME:
+ assert(streq((char *) data, "lo"));
+ break;
+ }
+ }
+
+ return 1;
+}
+
+static void test_event_loop(int ifindex) {
+ _cleanup_event_unref_ sd_event *event = NULL;
+ _cleanup_sd_rtnl_unref_ sd_rtnl *rtnl = NULL;
+ _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *m = NULL;
+ char *ifname;
+
+ ifname = strdup("lo2");
+ assert(ifname);
+
+ assert(sd_rtnl_open(0, &rtnl) >= 0);
+ assert(sd_rtnl_message_link_new(RTM_GETLINK, ifindex, &m) >= 0);
+
+ assert(sd_rtnl_call_async(rtnl, m, &link_handler, ifname, 0, NULL) >= 0);
+
+ assert(sd_event_default(&event) >= 0);
+
+ assert(sd_rtnl_attach_event(rtnl, event, 0) >= 0);
+
+ assert(sd_event_run(event, 0) >= 0);
+
+ assert(sd_rtnl_detach_event(rtnl) >= 0);
+}
+
+static int pipe_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
+ int *counter = userdata;
+
+ (*counter) --;
+
+ log_info("got reply, %d left in pipe", *counter);
+
+ return sd_rtnl_message_get_errno(m);
+}
+
+static void test_async(int ifindex) {
+ _cleanup_sd_rtnl_unref_ sd_rtnl *rtnl = NULL;
+ _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *m = NULL, *r = NULL;
+ uint32_t serial;
+ char *ifname;
+
+ ifname = strdup("lo");
+ assert(ifname);
+
+ assert(sd_rtnl_open(0, &rtnl) >= 0);
+
+ assert(sd_rtnl_message_link_new(RTM_GETLINK, ifindex, &m) >= 0);
+
+ assert(sd_rtnl_call_async(rtnl, m, &link_handler, ifname, 0, &serial) >= 0);
+
+ assert(sd_rtnl_wait(rtnl, 0) >= 0);
+ assert(sd_rtnl_process(rtnl, &r) >= 0);
+}
+
+static void test_pipe(int ifindex) {
+ _cleanup_sd_rtnl_unref_ sd_rtnl *rtnl = NULL;
+ _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *m1 = NULL, *m2 = NULL;
+ int counter = 0;
+
+ assert(sd_rtnl_open(0, &rtnl) >= 0);
+
+ assert(sd_rtnl_message_link_new(RTM_GETLINK, ifindex, &m1) >= 0);
+ assert(sd_rtnl_message_link_new(RTM_GETLINK, ifindex, &m2) >= 0);
+
+ counter ++;
+ assert(sd_rtnl_call_async(rtnl, m1, &pipe_handler, &counter, 0, NULL) >= 0);
+
+ counter ++;
+ assert(sd_rtnl_call_async(rtnl, m2, &pipe_handler, &counter, 0, NULL) >= 0);
+
+ while (counter > 0) {
+ assert(sd_rtnl_wait(rtnl, 0) >= 0);
+ assert(sd_rtnl_process(rtnl, NULL) >= 0);
+ }
+}
+
+static void test_container(void) {
+ _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *m = NULL;
+ uint16_t type;
+ void *data;
+
+ assert(sd_rtnl_message_link_new(RTM_NEWLINK, 0, &m) >= 0);
+
+ assert(sd_rtnl_message_open_container(m, IFLA_LINKINFO) >= 0);
+ assert(sd_rtnl_message_open_container(m, IFLA_LINKINFO) == -EINVAL);
+ assert(sd_rtnl_message_append_string(m, IFLA_INFO_KIND, "kind") >= 0);
+ assert(sd_rtnl_message_close_container(m) >= 0);
+ assert(sd_rtnl_message_close_container(m) == -EINVAL);
+
+ assert(sd_rtnl_message_read(m, &type, &data) == -EINVAL);
+
+/* TODO: add support for entering containers
+ assert(sd_rtnl_message_read(m, &type, &data) > 0);
+ assert(type == IFLA_INFO_KIND);
+ assert(streq("kind", (char *) data));
+
+ assert(sd_rtnl_message_read(m, &type, &data) == 0);
+*/
+}
+
+static void test_match(void) {
+ _cleanup_sd_rtnl_unref_ sd_rtnl *rtnl = NULL;
+
+ assert(sd_rtnl_open(0, &rtnl) >= 0);
+
+ assert(sd_rtnl_add_match(rtnl, RTM_NEWLINK, &link_handler, NULL) >= 0);
+ assert(sd_rtnl_add_match(rtnl, RTM_NEWLINK, &link_handler, NULL) >= 0);
+
+ assert(sd_rtnl_remove_match(rtnl, RTM_NEWLINK, &link_handler, NULL) == 1);
+ assert(sd_rtnl_remove_match(rtnl, RTM_NEWLINK, &link_handler, NULL) == 1);
+ assert(sd_rtnl_remove_match(rtnl, RTM_NEWLINK, &link_handler, NULL) == 0);
+}
+
+int main(void) {
+ sd_rtnl *rtnl;
+ sd_rtnl_message *m;
+ sd_rtnl_message *r;
+ void *data;
+ int if_loopback;
+ uint16_t type;
+ unsigned int mtu = 0;
+ unsigned int *mtu_reply;
+
+ test_match();
+
+ test_multiple();
+
+ test_route();
+
+ test_container();
+
+ assert(sd_rtnl_open(0, &rtnl) >= 0);
+ assert(rtnl);
+
+ if_loopback = (int) if_nametoindex("lo");
+ assert(if_loopback > 0);
+
+ test_async(if_loopback);
+
+ test_pipe(if_loopback);
+
+ test_event_loop(if_loopback);
+
+ test_link_configure(rtnl, if_loopback);
+
+ assert(sd_rtnl_message_link_new(RTM_GETLINK, if_loopback, &m) >= 0);
+ assert(m);
+
+ assert(sd_rtnl_message_get_type(m, &type) >= 0);
+ assert(type == RTM_GETLINK);
+
+ assert(sd_rtnl_message_read(m, &type, &data) == 0);
+
+ assert(sd_rtnl_call(rtnl, m, 0, &r) == 1);
+ assert(sd_rtnl_message_get_type(r, &type) >= 0);
+ assert(type == RTM_NEWLINK);
+
+ assert(sd_rtnl_message_read(m, &type, &data) == 0);
+ assert((r = sd_rtnl_message_unref(r)) == NULL);
+
+ assert(sd_rtnl_call(rtnl, m, -1, &r) == -EPERM);
+ assert((m = sd_rtnl_message_unref(m)) == NULL);
+ assert((r = sd_rtnl_message_unref(r)) == NULL);
+
+ assert(sd_rtnl_message_link_new(RTM_GETLINK, if_loopback, &m) >= 0);
+ assert(m);
+
+ assert(sd_rtnl_message_append_u32(m, IFLA_MTU, mtu) >= 0);
+ assert(sd_rtnl_message_read(m, &type, (void **) &mtu_reply) == 1);
+
+ assert(type == IFLA_MTU);
+ assert(*mtu_reply == 0);
+
+ assert(sd_rtnl_message_read(m, &type, &data) == 0);
+
+ assert(sd_rtnl_call(rtnl, m, -1, &r) == 1);
+ while (sd_rtnl_message_read(r, &type, &data) > 0) {
+ switch (type) {
+// case IFLA_MTU:
+// assert(*(unsigned int *) data == 65536);
+// break;
+// case IFLA_QDISC:
+// assert(streq((char *) data, "noqueue"));
+// break;
+ case IFLA_IFNAME:
+ assert(streq((char *) data, "lo"));
+ break;
+ }
+ }
+
+ assert(sd_rtnl_flush(rtnl) >= 0);
+
+ assert((m = sd_rtnl_message_unref(m)) == NULL);
+ assert((r = sd_rtnl_message_unref(r)) == NULL);
+ assert((rtnl = sd_rtnl_unref(rtnl)) == NULL);
+
+ return EXIT_SUCCESS;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-16 10:28:10 +0000