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-rw-r--r--src/libsystemd-rtnl/rtnl-internal.h40
-rw-r--r--src/libsystemd-rtnl/rtnl-message.c448
-rw-r--r--src/libsystemd-rtnl/sd-rtnl.c188
-rw-r--r--src/libsystemd-rtnl/test-rtnl.c126
-rw-r--r--src/systemd/sd-rtnl.h52
5 files changed, 854 insertions, 0 deletions
diff --git a/src/libsystemd-rtnl/rtnl-internal.h b/src/libsystemd-rtnl/rtnl-internal.h
new file mode 100644
index 0000000000..37b1d3d021
--- /dev/null
+++ b/src/libsystemd-rtnl/rtnl-internal.h
@@ -0,0 +1,40 @@
+/*-*- 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 "refcnt.h"
+
+struct sd_rtnl {
+ RefCount n_ref;
+
+ int fd;
+
+ union {
+ struct sockaddr sa;
+ struct sockaddr_nl nl;
+ } sockaddr;
+
+ unsigned serial;
+};
+int message_get_errno(sd_rtnl_message *m);
+int message_get_serial(sd_rtnl_message *m);
+int message_seal(sd_rtnl *nl, sd_rtnl_message *m);
+int socket_write_message(sd_rtnl *nl, sd_rtnl_message *m);
+int socket_read_message(sd_rtnl *nl, sd_rtnl_message **ret);
diff --git a/src/libsystemd-rtnl/rtnl-message.c b/src/libsystemd-rtnl/rtnl-message.c
new file mode 100644
index 0000000000..82ec1c97ab
--- /dev/null
+++ b/src/libsystemd-rtnl/rtnl-message.c
@@ -0,0 +1,448 @@
+/*-*- 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 <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;
+
+ struct rtattr *next_rta;
+ size_t remaining_size;
+
+ bool sealed:1;
+};
+
+static int message_new(sd_rtnl_message **ret, size_t initial_size) {
+ sd_rtnl_message *m;
+
+ assert_return(ret, -EINVAL);
+ assert_return(initial_size > 0, -EINVAL);
+
+ m = new0(sd_rtnl_message, 1);
+ if (!m)
+ return -ENOMEM;
+
+ m->hdr = calloc(initial_size, 1);
+ 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 sd_rtnl_message_link_new(__u16 nlmsg_type, int index, unsigned int type, unsigned int flags, sd_rtnl_message **ret) {
+ struct ifinfomsg *ifi;
+ int r;
+
+ assert_return(nlmsg_type == RTM_NEWLINK || nlmsg_type == RTM_DELLINK || nlmsg_type == RTM_GETLINK, -EINVAL);
+ assert_return(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;
+
+ ifi = (struct ifinfomsg *) NLMSG_DATA((*ret)->hdr);
+
+ ifi->ifi_family = AF_UNSPEC;
+ ifi->ifi_index = index;
+ ifi->ifi_type = type;
+ ifi->ifi_flags = flags;
+ ifi->ifi_change = 0xffffffff;
+
+ return 0;
+}
+
+int sd_rtnl_message_addr_new(__u16 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(nlmsg_type == RTM_NEWADDR || nlmsg_type == RTM_DELADDR || nlmsg_type == RTM_GETADDR, -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 = (struct ifaddrmsg *) NLMSG_DATA((*ret)->hdr);
+
+ ifa->ifa_family = family;
+ ifa->ifa_prefixlen = prefixlen;
+ ifa->ifa_flags = flags;
+ ifa->ifa_scope = scope;
+ ifa->ifa_index = index;
+
+ 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, __u16 *type) {
+ assert_return(m, -EINVAL);
+ assert_return(type, -EINVAL);
+
+ *type = m->hdr->nlmsg_type;
+
+ 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) {
+ __u32 rta_length, message_length;
+ struct nlmsghdr *new_hdr;
+ struct rtattr *rta;
+
+ assert_return(m, -EINVAL);
+ assert_return(m->hdr, -EINVAL);
+ assert_return(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len, -EINVAL);
+ assert_return(data, -EINVAL);
+ assert_return(data_length > 0, -EINVAL);
+
+ /* get the size of the new rta attribute (without padding at the end) */
+ rta_length = RTA_LENGTH(data_length);
+ /* get the new message size (with padding between the old message and the new attrib,
+ * but no padding after)
+ */
+ 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);
+ /* update message size */
+ m->hdr->nlmsg_len = message_length;
+
+ /* fill in the attribute */
+ rta->rta_type = type;
+ rta->rta_len = rta_length;
+ /* 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)
+ */
+ memcpy(RTA_DATA(rta), data, data_length);
+
+ return 0;
+}
+
+int sd_rtnl_message_append(sd_rtnl_message *m, unsigned short type, const void *data) {
+ __u16 rtm_type;
+ struct ifaddrmsg *ifa;
+
+ assert_return(m, -EINVAL);
+ assert_return(data, -EINVAL);
+
+ sd_rtnl_message_get_type(m, &rtm_type);
+
+ switch (rtm_type) {
+ case RTM_NEWLINK:
+ case RTM_DELLINK:
+ case RTM_GETLINK:
+ switch (type) {
+ case IFLA_IFNAME:
+ case IFLA_QDISC:
+ return add_rtattr(m, type, data, strlen(data) + 1);
+ case IFLA_MTU:
+ return add_rtattr(m, type, data, sizeof(unsigned int));
+ case IFLA_LINK:
+ return add_rtattr(m, type, data, sizeof(int));
+ case IFLA_STATS:
+ return add_rtattr(m, type, data, sizeof(struct rtnl_link_stats));
+ case IFLA_ADDRESS:
+ case IFLA_BROADCAST:
+ return add_rtattr(m, type, data, ETH_ALEN);
+ default:
+ return -ENOTSUP;
+ }
+ case RTM_NEWADDR:
+ case RTM_DELADDR:
+ case RTM_GETADDR:
+ switch (type) {
+ case IFA_LABEL:
+ return add_rtattr(m, type, data, strlen(data) + 1);
+ case IFA_ADDRESS:
+ case IFA_LOCAL:
+ case IFA_BROADCAST:
+ case IFA_ANYCAST:
+ ifa = NLMSG_DATA(m->hdr);
+ switch (ifa->ifa_family) {
+ case AF_INET:
+ return add_rtattr(m, type, data, sizeof(struct in_addr));
+ case AF_INET6:
+ return add_rtattr(m, type, data, sizeof(struct in6_addr));
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -ENOTSUP;
+ }
+ default:
+ return -ENOTSUP;
+ }
+}
+
+static int message_read(sd_rtnl_message *m, unsigned short *type, void **data) {
+ assert_return(m, -EINVAL);
+ assert_return(data, -EINVAL);
+
+ if (!RTA_OK(m->next_rta, m->remaining_size))
+ return 0;
+
+ *data = RTA_DATA(m->next_rta);
+ *type = m->next_rta->rta_type;
+
+ m->next_rta = RTA_NEXT(m->next_rta, m->remaining_size);
+
+ return 1;
+}
+
+int sd_rtnl_message_read(sd_rtnl_message *m, unsigned short *type, void **data) {
+ __u16 rtm_type;
+
+ assert_return(m, -EINVAL);
+ assert_return(data, -EINVAL);
+
+ sd_rtnl_message_get_type(m, &rtm_type);
+
+ switch (rtm_type) {
+ case RTM_NEWLINK:
+ case RTM_DELLINK:
+ case RTM_GETLINK:
+ if (!m->next_rta) {
+ struct ifinfomsg *ifi = (struct ifinfomsg *) NLMSG_DATA(m->hdr);
+
+ m->next_rta = IFLA_RTA(ifi);
+ m->remaining_size = IFLA_PAYLOAD(m->hdr);
+ }
+ break;;
+ case RTM_NEWADDR:
+ case RTM_DELADDR:
+ case RTM_GETADDR:
+ if (!m->next_rta) {
+ struct ifaddrmsg *ifa = (struct ifaddrmsg *) NLMSG_DATA(m->hdr);
+
+ m->next_rta = IFA_RTA(ifa);
+ m->remaining_size = IFLA_PAYLOAD(m->hdr);
+ }
+ break;;
+ default:
+ return -ENOTSUP;
+ }
+
+ return message_read(m, type, data);
+}
+
+int message_get_serial(sd_rtnl_message *m) {
+ assert(m);
+
+ return m->hdr->nlmsg_seq;
+}
+
+int message_get_errno(sd_rtnl_message *m) {
+ struct nlmsgerr *err;
+
+ assert(m);
+
+ 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) {
+ 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_return(rtnl, -EINVAL);
+ assert_return(need, -EINVAL);
+
+ /* 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 = getpagesize();
+ 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) {
+ ssize_t k;
+
+ assert_return(nl, -EINVAL);
+ assert_return(m, -EINVAL);
+
+ k = sendto(nl->fd, m->hdr, m->hdr->nlmsg_len,
+ 0, &nl->sockaddr.sa, sizeof(nl->sockaddr));
+ 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;
+ socklen_t addr_len = sizeof(nl->sockaddr);
+ int r;
+ ssize_t k;
+ size_t need;
+
+ assert_return(nl, -EINVAL);
+ assert_return(ret, -EINVAL);
+
+ r = message_receive_need(nl, &need);
+ if (r < 0)
+ return r;
+
+ r = message_new(&m, need);
+ if (r < 0)
+ return r;
+
+ r = message_receive_need(nl, &need);
+ if (r < 0)
+ return r;
+
+ m->hdr = realloc(m->hdr, need);
+ if (!m->hdr)
+ return -ENOMEM;
+
+ k = recvfrom(nl->fd, m->hdr, need,
+ 0, &nl->sockaddr.sa, &addr_len);
+ if (k < 0)
+ k = (errno == EAGAIN) ? 0 : -errno; /* no data? weird... */
+ else if (k == 0)
+ k = -ECONNRESET; /* connection was closed by the kernel */
+ else if (addr_len != sizeof(nl->sockaddr.nl) ||
+ nl->sockaddr.nl.nl_family != AF_NETLINK)
+ k = -EIO; /* not a netlink message */
+ else if (nl->sockaddr.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_type == NLMSG_NOOP)
+ k = 0;
+ else if (m->hdr->nlmsg_type == NLMSG_ERROR &&
+ m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
+ k = -EIO;
+ else if ((pid_t) m->hdr->nlmsg_pid != getpid())
+ k = 0; /* not for us */
+
+ if (k > 0)
+ switch (m->hdr->nlmsg_type) {
+ /* 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_DELLINK:
+ case RTM_GETLINK:
+ if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifinfomsg)))
+ k = -EIO;
+ break;;
+ case RTM_NEWADDR:
+ case RTM_DELADDR:
+ case RTM_GETADDR:
+ if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifaddrmsg)))
+ k = -EIO;
+ 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;
+}
diff --git a/src/libsystemd-rtnl/sd-rtnl.c b/src/libsystemd-rtnl/sd-rtnl.c
new file mode 100644
index 0000000000..abf45d0eed
--- /dev/null
+++ b/src/libsystemd-rtnl/sd-rtnl.c
@@ -0,0 +1,188 @@
+/*-*- 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 "sd-rtnl.h"
+#include "rtnl-internal.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;
+
+ *ret = rtnl;
+ return 0;
+}
+
+int sd_rtnl_open(__u32 groups, sd_rtnl **ret) {
+ sd_rtnl *rtnl;
+ int r;
+
+ 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) {
+ r = -errno;
+ sd_rtnl_unref(rtnl);
+ return r;
+ }
+
+ rtnl->sockaddr.nl.nl_groups = groups;
+
+ r = bind(rtnl->fd, &rtnl->sockaddr.sa, sizeof(rtnl->sockaddr));
+ if (r < 0) {
+ r = -errno;
+ sd_rtnl_unref(rtnl);
+ return r;
+ }
+
+ *ret = rtnl;
+
+ 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) {
+ if (rtnl->fd >= 0)
+ close_nointr_nofail(rtnl->fd);
+ free(rtnl);
+ }
+
+ return NULL;
+}
+
+int sd_rtnl_send_with_reply_and_block(sd_rtnl *nl,
+ sd_rtnl_message *message,
+ uint64_t usec,
+ sd_rtnl_message **ret) {
+ struct pollfd p[1] = {};
+ sd_rtnl_message *reply;
+ struct timespec left;
+ usec_t timeout;
+ int r, serial;
+
+ assert_return(nl, -EINVAL);
+ assert_return(message, -EINVAL);
+
+ r = message_seal(nl, message);
+ if (r < 0)
+ return r;
+
+ serial = message_get_serial(message);
+
+ p[0].fd = nl->fd;
+ p[0].events = POLLOUT;
+
+ timeout = now(CLOCK_MONOTONIC) + usec;
+
+ for (;;) {
+ if (usec != (uint64_t) -1) {
+ usec_t n;
+
+ n = now(CLOCK_MONOTONIC);
+ if (n >= timeout)
+ return -ETIMEDOUT;
+
+ timespec_store(&left, timeout - n);
+ }
+
+ r = ppoll(p, 1, usec == (uint64_t) -1 ? NULL : &left, NULL);
+ if (r < 0)
+ return 0;
+
+ r = socket_write_message(nl, message);
+ if (r < 0)
+ return r;
+
+ if (r > 0) {
+ break;
+ }
+ }
+
+ p[0].events = POLLIN;
+
+ for (;;) {
+ if (usec != (uint64_t) -1) {
+ usec_t n;
+
+ n = now(CLOCK_MONOTONIC);
+ if (n >= timeout)
+ return -ETIMEDOUT;
+
+ timespec_store(&left, timeout - n);
+ }
+
+ r = ppoll(p, 1, usec == (uint64_t) -1 ? NULL : &left, NULL);
+ if (r < 0)
+ return r;
+
+ r = socket_read_message(nl, &reply);
+ if (r < 0)
+ return r;
+
+ if (r > 0) {
+ int received_serial = message_get_serial(reply);
+
+ if (received_serial == serial) {
+ r = message_get_errno(reply);
+ if (r < 0) {
+ sd_rtnl_message_unref(reply);
+ return r;
+ }
+
+ if (ret)
+ *ret = reply;
+ else
+ reply = sd_rtnl_message_unref(reply);
+
+ break;;
+ }
+
+ reply = sd_rtnl_message_unref(reply);
+ }
+ }
+
+ return 0;
+}
diff --git a/src/libsystemd-rtnl/test-rtnl.c b/src/libsystemd-rtnl/test-rtnl.c
new file mode 100644
index 0000000000..bcfd816688
--- /dev/null
+++ b/src/libsystemd-rtnl/test-rtnl.c
@@ -0,0 +1,126 @@
+/*-*- 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 <netinet/ether.h>
+
+#include "util.h"
+#include "macro.h"
+#include "sd-rtnl.h"
+#include "socket-util.h"
+
+static void test_link_configure(sd_rtnl *rtnl, int ifindex) {
+ _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *message;
+ __u16 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, 0, 0, &message) >= 0);
+ assert(sd_rtnl_message_append(message, IFLA_IFNAME, name) >= 0);
+ assert(sd_rtnl_message_append(message, IFLA_ADDRESS, ether_aton(mac)) >= 0);
+ assert(sd_rtnl_message_append(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);
+
+ /* let's assume that this test is always ran when the loopback device is up, so that it will fail */
+ assert(sd_rtnl_send_with_reply_and_block(rtnl, message, 2 * USEC_PER_SEC, NULL) == 0);
+}
+
+int main(void) {
+ sd_rtnl *rtnl;
+ sd_rtnl_message *m;
+ sd_rtnl_message *r;
+ void *data;
+ int if_loopback;
+ __u16 type;
+ unsigned int mtu = 0;
+ unsigned int *mtu_reply;
+
+ assert(sd_rtnl_open(0, &rtnl) >= 0);
+ assert(rtnl);
+
+ if_loopback = (int) if_nametoindex("lo");
+ assert(if_loopback > 0);
+
+ test_link_configure(rtnl, if_loopback);
+
+ assert(sd_rtnl_message_link_new(RTM_GETLINK, if_loopback, 0, 0, &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_send_with_reply_and_block(rtnl, m, 100000000, &r) >= 0);
+ 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_send_with_reply_and_block(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, 0, 0, &m) >= 0);
+ assert(m);
+
+ assert(sd_rtnl_message_append(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_send_with_reply_and_block(rtnl, m, -1, &r) >= 0);
+ while (sd_rtnl_message_read(r, &type, &data)) {
+ switch (type) {
+ case IFLA_MTU:
+ assert(*(unsigned int *) data == 65536);
+ break;;
+ case IFLA_IFNAME:
+ assert(streq((char *) data, "lo"));
+ break;;
+ case IFLA_QDISC:
+ assert(streq((char *) data, "noqueue"));
+ break;;
+ }
+ }
+
+ 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;
+}
diff --git a/src/systemd/sd-rtnl.h b/src/systemd/sd-rtnl.h
new file mode 100644
index 0000000000..5f5f3e3d20
--- /dev/null
+++ b/src/systemd/sd-rtnl.h
@@ -0,0 +1,52 @@
+/*-*- 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 <linux/netlink.h>
+#include <stdint.h>
+#include <util.h>
+
+typedef struct sd_rtnl sd_rtnl;
+typedef struct sd_rtnl_message sd_rtnl_message;
+
+/* bus */
+int sd_rtnl_open(__u32 groups, sd_rtnl **nl);
+
+sd_rtnl *sd_rtnl_ref(sd_rtnl *nl);
+sd_rtnl *sd_rtnl_unref(sd_rtnl *nl);
+
+int sd_rtnl_send_with_reply_and_block(sd_rtnl *nl, sd_rtnl_message *message, uint64_t timeout, sd_rtnl_message **reply);
+
+/* messages */
+int sd_rtnl_message_link_new(__u16 msg_type, int index, unsigned int type, unsigned int flags, sd_rtnl_message **ret);
+int sd_rtnl_message_addr_new(__u16 msg_type, int index, unsigned char family, unsigned char prefixlen, unsigned char flags, unsigned char scope, sd_rtnl_message **ret);
+sd_rtnl_message *sd_rtnl_message_ref(sd_rtnl_message *m);
+sd_rtnl_message *sd_rtnl_message_unref(sd_rtnl_message *m);
+
+int sd_rtnl_message_get_type(sd_rtnl_message *m, __u16 *type);
+int sd_rtnl_message_append(sd_rtnl_message *m, unsigned short type, const void *data);
+int sd_rtnl_message_read(sd_rtnl_message *m, unsigned short *type, void **data);
+
+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)
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-10 00:34:40 +0000