sd-netlink: message - split up source file

Split netlink-socket.c and rtnl-message.c from netlink-message.c.

4 files changed, 867 insertions, 796 deletions

diff --git a/src/libsystemd/sd-netlink/netlink-internal.h b/src/libsystemd/sd-netlink/netlink-internal.h
index 24ebbbe7d..763acbbb0 100644
--- a/src/libsystemd/sd-netlink/netlink-internal.h
+++ b/src/libsystemd/sd-netlink/netlink-internal.h
@@ -111,6 +111,7 @@ struct sd_netlink_message {
 };
 
 int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type);
+int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret);
 
 int socket_write_message(sd_netlink *nl, sd_netlink_message *m);
 int socket_read_message(sd_netlink *nl);
diff --git a/src/libsystemd/sd-netlink/netlink-message.c b/src/libsystemd/sd-netlink/netlink-message.c
index fe9714ab5..87324fc2f 100644
--- a/src/libsystemd/sd-netlink/netlink-message.c
+++ b/src/libsystemd/sd-netlink/netlink-message.c
@@ -39,7 +39,7 @@
 
 #define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK)
 
-static int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) {
+int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) {
         sd_netlink_message *m;
 
         assert_return(ret, -EINVAL);
@@ -95,305 +95,6 @@ int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) {
         return 0;
 }
 
-int sd_rtnl_message_route_set_dst_prefixlen(sd_netlink_message *m, unsigned char prefixlen) {
-        struct rtmsg *rtm;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
-
-        rtm = NLMSG_DATA(m->hdr);
-
-        if ((rtm->rtm_family == AF_INET && prefixlen > 32) ||
-            (rtm->rtm_family == AF_INET6 && prefixlen > 128))
-                return -ERANGE;
-
-        rtm->rtm_dst_len = prefixlen;
-
-        return 0;
-}
-
-int sd_rtnl_message_route_set_src_prefixlen(sd_netlink_message *m, unsigned char prefixlen) {
-        struct rtmsg *rtm;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
-
-        rtm = NLMSG_DATA(m->hdr);
-
-        if ((rtm->rtm_family == AF_INET && prefixlen > 32) ||
-            (rtm->rtm_family == AF_INET6 && prefixlen > 128))
-                return -ERANGE;
-
-        rtm->rtm_src_len = prefixlen;
-
-        return 0;
-}
-
-int sd_rtnl_message_route_set_scope(sd_netlink_message *m, unsigned char scope) {
-        struct rtmsg *rtm;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
-
-        rtm = NLMSG_DATA(m->hdr);
-
-        rtm->rtm_scope = scope;
-
-        return 0;
-}
-
-int sd_rtnl_message_route_get_family(sd_netlink_message *m, int *family) {
-        struct rtmsg *rtm;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
-        assert_return(family, -EINVAL);
-
-        rtm = NLMSG_DATA(m->hdr);
-
-        *family = rtm->rtm_family;
-
-        return 0;
-}
-
-int sd_rtnl_message_route_get_dst_prefixlen(sd_netlink_message *m, unsigned char *dst_len) {
-        struct rtmsg *rtm;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
-        assert_return(dst_len, -EINVAL);
-
-        rtm = NLMSG_DATA(m->hdr);
-
-        *dst_len = rtm->rtm_dst_len;
-
-        return 0;
-}
-
-int sd_rtnl_message_route_get_src_prefixlen(sd_netlink_message *m, unsigned char *src_len) {
-        struct rtmsg *rtm;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
-        assert_return(src_len, -EINVAL);
-
-        rtm = NLMSG_DATA(m->hdr);
-
-        *src_len = rtm->rtm_src_len;
-
-        return 0;
-}
-
-int sd_rtnl_message_new_route(sd_netlink *rtnl, sd_netlink_message **ret,
-                              uint16_t nlmsg_type, int rtm_family,
-                              unsigned char rtm_protocol) {
-        struct rtmsg *rtm;
-        int r;
-
-        assert_return(rtnl_message_type_is_route(nlmsg_type), -EINVAL);
-        assert_return((nlmsg_type == RTM_GETROUTE && rtm_family == AF_UNSPEC) ||
-                      rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL);
-        assert_return(ret, -EINVAL);
-
-        r = message_new(rtnl, ret, nlmsg_type);
-        if (r < 0)
-                return r;
-
-        if (nlmsg_type == RTM_NEWROUTE)
-                (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND;
-
-        rtm = NLMSG_DATA((*ret)->hdr);
-
-        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 = rtm_protocol;
-
-        return 0;
-}
-
-int sd_rtnl_message_neigh_set_flags(sd_netlink_message *m, uint8_t flags) {
-        struct ndmsg *ndm;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
-
-        ndm = NLMSG_DATA(m->hdr);
-        ndm->ndm_flags |= flags;
-
-        return 0;
-}
-
-int sd_rtnl_message_neigh_set_state(sd_netlink_message *m, uint16_t state) {
-        struct ndmsg *ndm;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
-
-        ndm = NLMSG_DATA(m->hdr);
-        ndm->ndm_state |= state;
-
-        return 0;
-}
-
-int sd_rtnl_message_neigh_get_flags(sd_netlink_message *m, uint8_t *flags) {
-        struct ndmsg *ndm;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
-
-        ndm = NLMSG_DATA(m->hdr);
-        *flags = ndm->ndm_flags;
-
-        return 0;
-}
-
-int sd_rtnl_message_neigh_get_state(sd_netlink_message *m, uint16_t *state) {
-        struct ndmsg *ndm;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
-
-        ndm = NLMSG_DATA(m->hdr);
-        *state = ndm->ndm_state;
-
-        return 0;
-}
-
-int sd_rtnl_message_neigh_get_family(sd_netlink_message *m, int *family) {
-        struct ndmsg *ndm;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
-        assert_return(family, -EINVAL);
-
-        ndm = NLMSG_DATA(m->hdr);
-
-        *family = ndm->ndm_family;
-
-        return 0;
-}
-
-int sd_rtnl_message_neigh_get_ifindex(sd_netlink_message *m, int *index) {
-        struct ndmsg *ndm;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
-        assert_return(index, -EINVAL);
-
-        ndm = NLMSG_DATA(m->hdr);
-
-        *index = ndm->ndm_ifindex;
-
-        return 0;
-}
-
-int sd_rtnl_message_new_neigh(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t nlmsg_type, int index, int ndm_family) {
-        struct ndmsg *ndm;
-        int r;
-
-        assert_return(rtnl_message_type_is_neigh(nlmsg_type), -EINVAL);
-        assert_return(ndm_family == AF_INET  ||
-                      ndm_family == AF_INET6 ||
-                      ndm_family == PF_BRIDGE, -EINVAL);
-        assert_return(ret, -EINVAL);
-
-        r = message_new(rtnl, ret, nlmsg_type);
-        if (r < 0)
-                return r;
-
-        if (nlmsg_type == RTM_NEWNEIGH)
-                (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND;
-
-        ndm = NLMSG_DATA((*ret)->hdr);
-
-        ndm->ndm_family = ndm_family;
-        ndm->ndm_ifindex = index;
-
-        return 0;
-}
-
-int sd_rtnl_message_link_set_flags(sd_netlink_message *m, unsigned flags, unsigned change) {
-        struct ifinfomsg *ifi;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
-        assert_return(change, -EINVAL);
-
-        ifi = NLMSG_DATA(m->hdr);
-
-        ifi->ifi_flags = flags;
-        ifi->ifi_change = change;
-
-        return 0;
-}
-
-int sd_rtnl_message_link_set_type(sd_netlink_message *m, unsigned type) {
-        struct ifinfomsg *ifi;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
-
-        ifi = NLMSG_DATA(m->hdr);
-
-        ifi->ifi_type = type;
-
-        return 0;
-}
-
-int sd_rtnl_message_link_set_family(sd_netlink_message *m, unsigned family) {
-        struct ifinfomsg *ifi;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
-
-        ifi = NLMSG_DATA(m->hdr);
-
-        ifi->ifi_family = family;
-
-        return 0;
-}
-
-int sd_rtnl_message_new_link(sd_netlink *rtnl, sd_netlink_message **ret,
-                             uint16_t nlmsg_type, int index) {
-        struct ifinfomsg *ifi;
-        int r;
-
-        assert_return(rtnl_message_type_is_link(nlmsg_type), -EINVAL);
-        assert_return(nlmsg_type != RTM_DELLINK || index > 0, -EINVAL);
-        assert_return(ret, -EINVAL);
-
-        r = message_new(rtnl, ret, nlmsg_type);
-        if (r < 0)
-                return r;
-
-        if (nlmsg_type == RTM_NEWLINK)
-                (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
-
-        ifi = NLMSG_DATA((*ret)->hdr);
-
-        ifi->ifi_family = AF_UNSPEC;
-        ifi->ifi_index = index;
-
-        return 0;
-}
-
 int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) {
         assert_return(m, -EINVAL);
         assert_return(m->hdr, -EINVAL);
@@ -411,172 +112,6 @@ int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) {
         return 0;
 }
 
-int sd_rtnl_message_addr_set_prefixlen(sd_netlink_message *m, unsigned char prefixlen) {
-        struct ifaddrmsg *ifa;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
-
-        ifa = NLMSG_DATA(m->hdr);
-
-        if ((ifa->ifa_family == AF_INET && prefixlen > 32) ||
-            (ifa->ifa_family == AF_INET6 && prefixlen > 128))
-                return -ERANGE;
-
-        ifa->ifa_prefixlen = prefixlen;
-
-        return 0;
-}
-
-int sd_rtnl_message_addr_set_flags(sd_netlink_message *m, unsigned char flags) {
-        struct ifaddrmsg *ifa;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
-
-        ifa = NLMSG_DATA(m->hdr);
-
-        ifa->ifa_flags = flags;
-
-        return 0;
-}
-
-int sd_rtnl_message_addr_set_scope(sd_netlink_message *m, unsigned char scope) {
-        struct ifaddrmsg *ifa;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
-
-        ifa = NLMSG_DATA(m->hdr);
-
-        ifa->ifa_scope = scope;
-
-        return 0;
-}
-
-int sd_rtnl_message_addr_get_family(sd_netlink_message *m, int *family) {
-        struct ifaddrmsg *ifa;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
-        assert_return(family, -EINVAL);
-
-        ifa = NLMSG_DATA(m->hdr);
-
-        *family = ifa->ifa_family;
-
-        return 0;
-}
-
-int sd_rtnl_message_addr_get_prefixlen(sd_netlink_message *m, unsigned char *prefixlen) {
-        struct ifaddrmsg *ifa;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
-        assert_return(prefixlen, -EINVAL);
-
-        ifa = NLMSG_DATA(m->hdr);
-
-        *prefixlen = ifa->ifa_prefixlen;
-
-        return 0;
-}
-
-int sd_rtnl_message_addr_get_scope(sd_netlink_message *m, unsigned char *scope) {
-        struct ifaddrmsg *ifa;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
-        assert_return(scope, -EINVAL);
-
-        ifa = NLMSG_DATA(m->hdr);
-
-        *scope = ifa->ifa_scope;
-
-        return 0;
-}
-
-int sd_rtnl_message_addr_get_flags(sd_netlink_message *m, unsigned char *flags) {
-        struct ifaddrmsg *ifa;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
-        assert_return(flags, -EINVAL);
-
-        ifa = NLMSG_DATA(m->hdr);
-
-        *flags = ifa->ifa_flags;
-
-        return 0;
-}
-
-int sd_rtnl_message_addr_get_ifindex(sd_netlink_message *m, int *ifindex) {
-        struct ifaddrmsg *ifa;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
-        assert_return(ifindex, -EINVAL);
-
-        ifa = NLMSG_DATA(m->hdr);
-
-        *ifindex = ifa->ifa_index;
-
-        return 0;
-}
-
-int sd_rtnl_message_new_addr(sd_netlink *rtnl, sd_netlink_message **ret,
-                             uint16_t nlmsg_type, int index,
-                             int family) {
-        struct ifaddrmsg *ifa;
-        int r;
-
-        assert_return(rtnl_message_type_is_addr(nlmsg_type), -EINVAL);
-        assert_return((nlmsg_type == RTM_GETADDR && index == 0) ||
-                      index > 0, -EINVAL);
-        assert_return((nlmsg_type == RTM_GETADDR && family == AF_UNSPEC) ||
-                      family == AF_INET || family == AF_INET6, -EINVAL);
-        assert_return(ret, -EINVAL);
-
-        r = message_new(rtnl, ret, nlmsg_type);
-        if (r < 0)
-                return r;
-
-        if (nlmsg_type == RTM_GETADDR)
-                (*ret)->hdr->nlmsg_flags |= NLM_F_DUMP;
-
-        ifa = NLMSG_DATA((*ret)->hdr);
-
-        ifa->ifa_index = index;
-        ifa->ifa_family = family;
-        if (family == AF_INET)
-                ifa->ifa_prefixlen = 32;
-        else if (family == AF_INET6)
-                ifa->ifa_prefixlen = 128;
-
-        return 0;
-}
-
-int sd_rtnl_message_new_addr_update(sd_netlink *rtnl, sd_netlink_message **ret,
-                             int index, int family) {
-        int r;
-
-        r = sd_rtnl_message_new_addr(rtnl, ret, RTM_NEWADDR, index, family);
-        if (r < 0)
-                return r;
-
-        (*ret)->hdr->nlmsg_flags |= NLM_F_REPLACE;
-
-        return 0;
-}
-
 sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m) {
         if (m)
                 assert_se(REFCNT_INC(m->n_ref) >= 2);
@@ -610,100 +145,12 @@ int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) {
         return 0;
 }
 
-int sd_netlink_message_get_family(sd_netlink_message *m, int *family) {
-        assert_return(m, -EINVAL);
-        assert_return(family, -EINVAL);
-
-        assert(m->hdr);
-
-        if (rtnl_message_type_is_link(m->hdr->nlmsg_type)) {
-                struct ifinfomsg *ifi;
-
-                ifi = NLMSG_DATA(m->hdr);
-
-                *family = ifi->ifi_family;
-
-                return 0;
-        } else if (rtnl_message_type_is_route(m->hdr->nlmsg_type)) {
-                struct rtmsg *rtm;
-
-                rtm = NLMSG_DATA(m->hdr);
-
-                *family = rtm->rtm_family;
-
-                return 0;
-        } else if (rtnl_message_type_is_neigh(m->hdr->nlmsg_type)) {
-                struct ndmsg *ndm;
-
-                ndm = NLMSG_DATA(m->hdr);
-
-                *family = ndm->ndm_family;
-
-                return 0;
-        } else if (rtnl_message_type_is_addr(m->hdr->nlmsg_type)) {
-                struct ifaddrmsg *ifa;
-
-                ifa = NLMSG_DATA(m->hdr);
-
-                *family = ifa->ifa_family;
-
-                return 0;
-        }
-
-        return -EOPNOTSUPP;
-}
-
 int sd_netlink_message_is_broadcast(sd_netlink_message *m) {
         assert_return(m, -EINVAL);
 
         return m->broadcast;
 }
 
-int sd_rtnl_message_link_get_ifindex(sd_netlink_message *m, int *ifindex) {
-        struct ifinfomsg *ifi;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_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_netlink_message *m, unsigned *flags) {
-        struct ifinfomsg *ifi;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
-        assert_return(flags, -EINVAL);
-
-        ifi = NLMSG_DATA(m->hdr);
-
-        *flags = ifi->ifi_flags;
-
-        return 0;
-}
-
-int sd_rtnl_message_link_get_type(sd_netlink_message *m, unsigned *type) {
-        struct ifinfomsg *ifi;
-
-        assert_return(m, -EINVAL);
-        assert_return(m->hdr, -EINVAL);
-        assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
-        assert_return(type, -EINVAL);
-
-        ifi = NLMSG_DATA(m->hdr);
-
-        *type = ifi->ifi_type;
-
-        return 0;
-}
-
 /* If successful the updated message will be correctly aligned, if
    unsuccessful the old message is untouched. */
 static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) {
@@ -951,7 +398,7 @@ int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type
                         return r;
                 size = (size_t) r;
 
-                r = sd_netlink_message_get_family(m, &family);
+                r = sd_rtnl_message_get_family(m, &family);
                 if (r < 0)
                         return r;
 
@@ -1274,7 +721,7 @@ int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short typ
                 {
                         int family;
 
-                        r = sd_netlink_message_get_family(m, &family);
+                        r = sd_rtnl_message_get_family(m, &family);
                         if (r < 0)
                                 return r;
 
@@ -1393,246 +840,6 @@ int rtnl_message_parse(sd_netlink_message *m,
         return 0;
 }
 
-/* returns the number of bytes sent, or a negative error code */
-int socket_write_message(sd_netlink *nl, sd_netlink_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;
-
-        return k;
-}
-
-static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool peek) {
-        union sockaddr_union sender;
-        uint8_t cmsg_buffer[CMSG_SPACE(sizeof(struct nl_pktinfo))];
-        struct msghdr msg = {
-                .msg_iov = iov,
-                .msg_iovlen = 1,
-                .msg_name = &sender,
-                .msg_namelen = sizeof(sender),
-                .msg_control = cmsg_buffer,
-                .msg_controllen = sizeof(cmsg_buffer),
-        };
-        struct cmsghdr *cmsg;
-        uint32_t group = 0;
-        int r;
-
-        assert(fd >= 0);
-        assert(iov);
-
-        r = recvmsg(fd, &msg, MSG_TRUNC | (peek ? MSG_PEEK : 0));
-        if (r < 0) {
-                /* no data */
-                if (errno == ENOBUFS)
-                        log_debug("rtnl: kernel receive buffer overrun");
-                else if (errno == EAGAIN)
-                        log_debug("rtnl: no data in socket");
-
-                return (errno == EAGAIN || errno == EINTR) ? 0 : -errno;
-        }
-
-        if (sender.nl.nl_pid != 0) {
-                /* not from the kernel, ignore */
-                log_debug("rtnl: ignoring message from portid %"PRIu32, sender.nl.nl_pid);
-
-                if (peek) {
-                        /* drop the message */
-                        r = recvmsg(fd, &msg, 0);
-                        if (r < 0)
-                                return (errno == EAGAIN || errno == EINTR) ? 0 : -errno;
-                }
-
-                return 0;
-        }
-
-        CMSG_FOREACH(cmsg, &msg) {
-                if (cmsg->cmsg_level == SOL_NETLINK &&
-                    cmsg->cmsg_type == NETLINK_PKTINFO &&
-                    cmsg->cmsg_len == CMSG_LEN(sizeof(struct nl_pktinfo))) {
-                        struct nl_pktinfo *pktinfo = (void *)CMSG_DATA(cmsg);
-
-                        /* multi-cast group */
-                        group = pktinfo->group;
-                }
-        }
-
-        if (_group)
-                *_group = group;
-
-        return r;
-}
-
-/* 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_netlink *rtnl) {
-        _cleanup_netlink_message_unref_ sd_netlink_message *first = NULL;
-        struct iovec iov = {};
-        uint32_t group = 0;
-        bool multi_part = false, done = false;
-        struct nlmsghdr *new_msg;
-        size_t len;
-        int r;
-        unsigned i = 0;
-
-        assert(rtnl);
-        assert(rtnl->rbuffer);
-        assert(rtnl->rbuffer_allocated >= sizeof(struct nlmsghdr));
-
-        /* read nothing, just get the pending message size */
-        r = socket_recv_message(rtnl->fd, &iov, NULL, true);
-        if (r <= 0)
-                return r;
-        else
-                len = (size_t)r;
-
-        /* make room for the pending message */
-        if (!greedy_realloc((void **)&rtnl->rbuffer,
-                            &rtnl->rbuffer_allocated,
-                            len, sizeof(uint8_t)))
-                return -ENOMEM;
-
-        iov.iov_base = rtnl->rbuffer;
-        iov.iov_len = rtnl->rbuffer_allocated;
-
-        /* read the pending message */
-        r = socket_recv_message(rtnl->fd, &iov, &group, false);
-        if (r <= 0)
-                return r;
-        else
-                len = (size_t)r;
-
-        if (len > rtnl->rbuffer_allocated)
-                /* message did not fit in read buffer */
-                return -EIO;
-
-        if (NLMSG_OK(rtnl->rbuffer, len) && rtnl->rbuffer->nlmsg_flags & NLM_F_MULTI) {
-                multi_part = true;
-
-                for (i = 0; i < rtnl->rqueue_partial_size; i++) {
-                        if (rtnl_message_get_serial(rtnl->rqueue_partial[i]) ==
-                            rtnl->rbuffer->nlmsg_seq) {
-                                first = rtnl->rqueue_partial[i];
-                                break;
-                        }
-                }
-        }
-
-        for (new_msg = rtnl->rbuffer; NLMSG_OK(new_msg, len) && !done; new_msg = NLMSG_NEXT(new_msg, len)) {
-                _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
-                const NLType *nl_type;
-
-                if (!group && new_msg->nlmsg_pid != rtnl->sockaddr.nl.nl_pid)
-                        /* not broadcast and not for us */
-                        continue;
-
-                if (new_msg->nlmsg_type == NLMSG_NOOP)
-                        /* silently drop noop messages */
-                        continue;
-
-                if (new_msg->nlmsg_type == NLMSG_DONE) {
-                        /* finished reading multi-part message */
-                        done = true;
-
-                        /* if first is not defined, put NLMSG_DONE into the receive queue. */
-                        if (first)
-                                continue;
-                }
-
-                /* check that we support this message type */
-                r = type_system_get_type(NULL, &nl_type, new_msg->nlmsg_type);
-                if (r < 0) {
-                        if (r == -EOPNOTSUPP)
-                                log_debug("sd-netlink: ignored message with unknown type: %i",
-                                          new_msg->nlmsg_type);
-
-                        continue;
-                }
-
-                /* check that the size matches the message type */
-                if (new_msg->nlmsg_len < NLMSG_LENGTH(nl_type->size)) {
-                        log_debug("sd-netlink: message larger than expected, dropping");
-                        continue;
-                }
-
-                r = message_new_empty(rtnl, &m);
-                if (r < 0)
-                        return r;
-
-                m->broadcast = !!group;
-
-                m->hdr = memdup(new_msg, new_msg->nlmsg_len);
-                if (!m->hdr)
-                        return -ENOMEM;
-
-                /* seal and parse the top-level message */
-                r = sd_netlink_message_rewind(m);
-                if (r < 0)
-                        return r;
-
-                /* push the message onto the multi-part message stack */
-                if (first)
-                        m->next = first;
-                first = m;
-                m = NULL;
-        }
-
-        if (len)
-                log_debug("sd-netlink: discarding %zu bytes of incoming message", len);
-
-        if (!first)
-                return 0;
-
-        if (!multi_part || done) {
-                /* we got a complete message, push it on the read queue */
-                r = rtnl_rqueue_make_room(rtnl);
-                if (r < 0)
-                        return r;
-
-                rtnl->rqueue[rtnl->rqueue_size ++] = first;
-                first = NULL;
-
-                if (multi_part && (i < rtnl->rqueue_partial_size)) {
-                        /* remove the message form the partial read queue */
-                        memmove(rtnl->rqueue_partial + i,rtnl->rqueue_partial + i + 1,
-                                sizeof(sd_netlink_message*) * (rtnl->rqueue_partial_size - i - 1));
-                        rtnl->rqueue_partial_size --;
-                }
-
-                return 1;
-        } else {
-                /* we only got a partial multi-part message, push it on the
-                   partial read queue */
-                if (i < rtnl->rqueue_partial_size) {
-                        rtnl->rqueue_partial[i] = first;
-                } else {
-                        r = rtnl_rqueue_partial_make_room(rtnl);
-                        if (r < 0)
-                                return r;
-
-                        rtnl->rqueue_partial[rtnl->rqueue_partial_size ++] = first;
-                }
-                first = NULL;
-
-                return 0;
-        }
-}
-
 int sd_netlink_message_rewind(sd_netlink_message *m) {
         const NLType *type;
         unsigned i;
diff --git a/src/libsystemd/sd-netlink/netlink-socket.c b/src/libsystemd/sd-netlink/netlink-socket.c
new file mode 100644
index 000000000..2e2826ac6
--- /dev/null
+++ b/src/libsystemd/sd-netlink/netlink-socket.c
@@ -0,0 +1,275 @@
+/*-*- 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 <stdbool.h>
+#include <unistd.h>
+
+#include "util.h"
+#include "socket-util.h"
+#include "formats-util.h"
+#include "refcnt.h"
+#include "missing.h"
+
+#include "sd-netlink.h"
+#include "netlink-util.h"
+#include "netlink-internal.h"
+#include "netlink-types.h"
+
+/* returns the number of bytes sent, or a negative error code */
+int socket_write_message(sd_netlink *nl, sd_netlink_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;
+
+        return k;
+}
+
+static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool peek) {
+        union sockaddr_union sender;
+        uint8_t cmsg_buffer[CMSG_SPACE(sizeof(struct nl_pktinfo))];
+        struct msghdr msg = {
+                .msg_iov = iov,
+                .msg_iovlen = 1,
+                .msg_name = &sender,
+                .msg_namelen = sizeof(sender),
+                .msg_control = cmsg_buffer,
+                .msg_controllen = sizeof(cmsg_buffer),
+        };
+        struct cmsghdr *cmsg;
+        uint32_t group = 0;
+        int r;
+
+        assert(fd >= 0);
+        assert(iov);
+
+        r = recvmsg(fd, &msg, MSG_TRUNC | (peek ? MSG_PEEK : 0));
+        if (r < 0) {
+                /* no data */
+                if (errno == ENOBUFS)
+                        log_debug("rtnl: kernel receive buffer overrun");
+                else if (errno == EAGAIN)
+                        log_debug("rtnl: no data in socket");
+
+                return (errno == EAGAIN || errno == EINTR) ? 0 : -errno;
+        }
+
+        if (sender.nl.nl_pid != 0) {
+                /* not from the kernel, ignore */
+                log_debug("rtnl: ignoring message from portid %"PRIu32, sender.nl.nl_pid);
+
+                if (peek) {
+                        /* drop the message */
+                        r = recvmsg(fd, &msg, 0);
+                        if (r < 0)
+                                return (errno == EAGAIN || errno == EINTR) ? 0 : -errno;
+                }
+
+                return 0;
+        }
+
+        CMSG_FOREACH(cmsg, &msg) {
+                if (cmsg->cmsg_level == SOL_NETLINK &&
+                    cmsg->cmsg_type == NETLINK_PKTINFO &&
+                    cmsg->cmsg_len == CMSG_LEN(sizeof(struct nl_pktinfo))) {
+                        struct nl_pktinfo *pktinfo = (void *)CMSG_DATA(cmsg);
+
+                        /* multi-cast group */
+                        group = pktinfo->group;
+                }
+        }
+
+        if (_group)
+                *_group = group;
+
+        return r;
+}
+
+/* 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_netlink *rtnl) {
+        _cleanup_netlink_message_unref_ sd_netlink_message *first = NULL;
+        struct iovec iov = {};
+        uint32_t group = 0;
+        bool multi_part = false, done = false;
+        struct nlmsghdr *new_msg;
+        size_t len;
+        int r;
+        unsigned i = 0;
+
+        assert(rtnl);
+        assert(rtnl->rbuffer);
+        assert(rtnl->rbuffer_allocated >= sizeof(struct nlmsghdr));
+
+        /* read nothing, just get the pending message size */
+        r = socket_recv_message(rtnl->fd, &iov, NULL, true);
+        if (r <= 0)
+                return r;
+        else
+                len = (size_t)r;
+
+        /* make room for the pending message */
+        if (!greedy_realloc((void **)&rtnl->rbuffer,
+                            &rtnl->rbuffer_allocated,
+                            len, sizeof(uint8_t)))
+                return -ENOMEM;
+
+        iov.iov_base = rtnl->rbuffer;
+        iov.iov_len = rtnl->rbuffer_allocated;
+
+        /* read the pending message */
+        r = socket_recv_message(rtnl->fd, &iov, &group, false);
+        if (r <= 0)
+                return r;
+        else
+                len = (size_t)r;
+
+        if (len > rtnl->rbuffer_allocated)
+                /* message did not fit in read buffer */
+                return -EIO;
+
+        if (NLMSG_OK(rtnl->rbuffer, len) && rtnl->rbuffer->nlmsg_flags & NLM_F_MULTI) {
+                multi_part = true;
+
+                for (i = 0; i < rtnl->rqueue_partial_size; i++) {
+                        if (rtnl_message_get_serial(rtnl->rqueue_partial[i]) ==
+                            rtnl->rbuffer->nlmsg_seq) {
+                                first = rtnl->rqueue_partial[i];
+                                break;
+                        }
+                }
+        }
+
+        for (new_msg = rtnl->rbuffer; NLMSG_OK(new_msg, len) && !done; new_msg = NLMSG_NEXT(new_msg, len)) {
+                _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
+                const NLType *nl_type;
+
+                if (!group && new_msg->nlmsg_pid != rtnl->sockaddr.nl.nl_pid)
+                        /* not broadcast and not for us */
+                        continue;
+
+                if (new_msg->nlmsg_type == NLMSG_NOOP)
+                        /* silently drop noop messages */
+                        continue;
+
+                if (new_msg->nlmsg_type == NLMSG_DONE) {
+                        /* finished reading multi-part message */
+                        done = true;
+
+                        /* if first is not defined, put NLMSG_DONE into the receive queue. */
+                        if (first)
+                                continue;
+                }
+
+                /* check that we support this message type */
+                r = type_system_get_type(NULL, &nl_type, new_msg->nlmsg_type);
+                if (r < 0) {
+                        if (r == -EOPNOTSUPP)
+                                log_debug("sd-netlink: ignored message with unknown type: %i",
+                                          new_msg->nlmsg_type);
+
+                        continue;
+                }
+
+                /* check that the size matches the message type */
+                if (new_msg->nlmsg_len < NLMSG_LENGTH(nl_type->size)) {
+                        log_debug("sd-netlink: message larger than expected, dropping");
+                        continue;
+                }
+
+                r = message_new_empty(rtnl, &m);
+                if (r < 0)
+                        return r;
+
+                m->broadcast = !!group;
+
+                m->hdr = memdup(new_msg, new_msg->nlmsg_len);
+                if (!m->hdr)
+                        return -ENOMEM;
+
+                /* seal and parse the top-level message */
+                r = sd_netlink_message_rewind(m);
+                if (r < 0)
+                        return r;
+
+                /* push the message onto the multi-part message stack */
+                if (first)
+                        m->next = first;
+                first = m;
+                m = NULL;
+        }
+
+        if (len)
+                log_debug("sd-netlink: discarding %zu bytes of incoming message", len);
+
+        if (!first)
+                return 0;
+
+        if (!multi_part || done) {
+                /* we got a complete message, push it on the read queue */
+                r = rtnl_rqueue_make_room(rtnl);
+                if (r < 0)
+                        return r;
+
+                rtnl->rqueue[rtnl->rqueue_size ++] = first;
+                first = NULL;
+
+                if (multi_part && (i < rtnl->rqueue_partial_size)) {
+                        /* remove the message form the partial read queue */
+                        memmove(rtnl->rqueue_partial + i,rtnl->rqueue_partial + i + 1,
+                                sizeof(sd_netlink_message*) * (rtnl->rqueue_partial_size - i - 1));
+                        rtnl->rqueue_partial_size --;
+                }
+
+                return 1;
+        } else {
+                /* we only got a partial multi-part message, push it on the
+                   partial read queue */
+                if (i < rtnl->rqueue_partial_size) {
+                        rtnl->rqueue_partial[i] = first;
+                } else {
+                        r = rtnl_rqueue_partial_make_room(rtnl);
+                        if (r < 0)
+                                return r;
+
+                        rtnl->rqueue_partial[rtnl->rqueue_partial_size ++] = first;
+                }
+                first = NULL;
+
+                return 0;
+        }
+}
diff --git a/src/libsystemd/sd-netlink/rtnl-message.c b/src/libsystemd/sd-netlink/rtnl-message.c
new file mode 100644
index 000000000..2f31f4ee6
--- /dev/null
+++ b/src/libsystemd/sd-netlink/rtnl-message.c
@@ -0,0 +1,588 @@
+/*-*- 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 <stdbool.h>
+#include <unistd.h>
+
+#include "util.h"
+#include "socket-util.h"
+#include "formats-util.h"
+#include "refcnt.h"
+#include "missing.h"
+
+#include "sd-netlink.h"
+#include "netlink-util.h"
+#include "netlink-internal.h"
+#include "netlink-types.h"
+
+int sd_rtnl_message_route_set_dst_prefixlen(sd_netlink_message *m, unsigned char prefixlen) {
+        struct rtmsg *rtm;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
+
+        rtm = NLMSG_DATA(m->hdr);
+
+        if ((rtm->rtm_family == AF_INET && prefixlen > 32) ||
+            (rtm->rtm_family == AF_INET6 && prefixlen > 128))
+                return -ERANGE;
+
+        rtm->rtm_dst_len = prefixlen;
+
+        return 0;
+}
+
+int sd_rtnl_message_route_set_src_prefixlen(sd_netlink_message *m, unsigned char prefixlen) {
+        struct rtmsg *rtm;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
+
+        rtm = NLMSG_DATA(m->hdr);
+
+        if ((rtm->rtm_family == AF_INET && prefixlen > 32) ||
+            (rtm->rtm_family == AF_INET6 && prefixlen > 128))
+                return -ERANGE;
+
+        rtm->rtm_src_len = prefixlen;
+
+        return 0;
+}
+
+int sd_rtnl_message_route_set_scope(sd_netlink_message *m, unsigned char scope) {
+        struct rtmsg *rtm;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
+
+        rtm = NLMSG_DATA(m->hdr);
+
+        rtm->rtm_scope = scope;
+
+        return 0;
+}
+
+int sd_rtnl_message_route_get_family(sd_netlink_message *m, int *family) {
+        struct rtmsg *rtm;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
+        assert_return(family, -EINVAL);
+
+        rtm = NLMSG_DATA(m->hdr);
+
+        *family = rtm->rtm_family;
+
+        return 0;
+}
+
+int sd_rtnl_message_route_get_dst_prefixlen(sd_netlink_message *m, unsigned char *dst_len) {
+        struct rtmsg *rtm;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
+        assert_return(dst_len, -EINVAL);
+
+        rtm = NLMSG_DATA(m->hdr);
+
+        *dst_len = rtm->rtm_dst_len;
+
+        return 0;
+}
+
+int sd_rtnl_message_route_get_src_prefixlen(sd_netlink_message *m, unsigned char *src_len) {
+        struct rtmsg *rtm;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
+        assert_return(src_len, -EINVAL);
+
+        rtm = NLMSG_DATA(m->hdr);
+
+        *src_len = rtm->rtm_src_len;
+
+        return 0;
+}
+
+int sd_rtnl_message_new_route(sd_netlink *rtnl, sd_netlink_message **ret,
+                              uint16_t nlmsg_type, int rtm_family,
+                              unsigned char rtm_protocol) {
+        struct rtmsg *rtm;
+        int r;
+
+        assert_return(rtnl_message_type_is_route(nlmsg_type), -EINVAL);
+        assert_return((nlmsg_type == RTM_GETROUTE && rtm_family == AF_UNSPEC) ||
+                      rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        r = message_new(rtnl, ret, nlmsg_type);
+        if (r < 0)
+                return r;
+
+        if (nlmsg_type == RTM_NEWROUTE)
+                (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND;
+
+        rtm = NLMSG_DATA((*ret)->hdr);
+
+        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 = rtm_protocol;
+
+        return 0;
+}
+
+int sd_rtnl_message_neigh_set_flags(sd_netlink_message *m, uint8_t flags) {
+        struct ndmsg *ndm;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
+
+        ndm = NLMSG_DATA(m->hdr);
+        ndm->ndm_flags |= flags;
+
+        return 0;
+}
+
+int sd_rtnl_message_neigh_set_state(sd_netlink_message *m, uint16_t state) {
+        struct ndmsg *ndm;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
+
+        ndm = NLMSG_DATA(m->hdr);
+        ndm->ndm_state |= state;
+
+        return 0;
+}
+
+int sd_rtnl_message_neigh_get_flags(sd_netlink_message *m, uint8_t *flags) {
+        struct ndmsg *ndm;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
+
+        ndm = NLMSG_DATA(m->hdr);
+        *flags = ndm->ndm_flags;
+
+        return 0;
+}
+
+int sd_rtnl_message_neigh_get_state(sd_netlink_message *m, uint16_t *state) {
+        struct ndmsg *ndm;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
+
+        ndm = NLMSG_DATA(m->hdr);
+        *state = ndm->ndm_state;
+
+        return 0;
+}
+
+int sd_rtnl_message_neigh_get_family(sd_netlink_message *m, int *family) {
+        struct ndmsg *ndm;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
+        assert_return(family, -EINVAL);
+
+        ndm = NLMSG_DATA(m->hdr);
+
+        *family = ndm->ndm_family;
+
+        return 0;
+}
+
+int sd_rtnl_message_neigh_get_ifindex(sd_netlink_message *m, int *index) {
+        struct ndmsg *ndm;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
+        assert_return(index, -EINVAL);
+
+        ndm = NLMSG_DATA(m->hdr);
+
+        *index = ndm->ndm_ifindex;
+
+        return 0;
+}
+
+int sd_rtnl_message_new_neigh(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t nlmsg_type, int index, int ndm_family) {
+        struct ndmsg *ndm;
+        int r;
+
+        assert_return(rtnl_message_type_is_neigh(nlmsg_type), -EINVAL);
+        assert_return(ndm_family == AF_INET  ||
+                      ndm_family == AF_INET6 ||
+                      ndm_family == PF_BRIDGE, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        r = message_new(rtnl, ret, nlmsg_type);
+        if (r < 0)
+                return r;
+
+        if (nlmsg_type == RTM_NEWNEIGH)
+                (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND;
+
+        ndm = NLMSG_DATA((*ret)->hdr);
+
+        ndm->ndm_family = ndm_family;
+        ndm->ndm_ifindex = index;
+
+        return 0;
+}
+
+int sd_rtnl_message_link_set_flags(sd_netlink_message *m, unsigned flags, unsigned change) {
+        struct ifinfomsg *ifi;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
+        assert_return(change, -EINVAL);
+
+        ifi = NLMSG_DATA(m->hdr);
+
+        ifi->ifi_flags = flags;
+        ifi->ifi_change = change;
+
+        return 0;
+}
+
+int sd_rtnl_message_link_set_type(sd_netlink_message *m, unsigned type) {
+        struct ifinfomsg *ifi;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
+
+        ifi = NLMSG_DATA(m->hdr);
+
+        ifi->ifi_type = type;
+
+        return 0;
+}
+
+int sd_rtnl_message_link_set_family(sd_netlink_message *m, unsigned family) {
+        struct ifinfomsg *ifi;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
+
+        ifi = NLMSG_DATA(m->hdr);
+
+        ifi->ifi_family = family;
+
+        return 0;
+}
+
+int sd_rtnl_message_new_link(sd_netlink *rtnl, sd_netlink_message **ret,
+                             uint16_t nlmsg_type, int index) {
+        struct ifinfomsg *ifi;
+        int r;
+
+        assert_return(rtnl_message_type_is_link(nlmsg_type), -EINVAL);
+        assert_return(nlmsg_type != RTM_DELLINK || index > 0, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        r = message_new(rtnl, ret, nlmsg_type);
+        if (r < 0)
+                return r;
+
+        if (nlmsg_type == RTM_NEWLINK)
+                (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
+
+        ifi = NLMSG_DATA((*ret)->hdr);
+
+        ifi->ifi_family = AF_UNSPEC;
+        ifi->ifi_index = index;
+
+        return 0;
+}
+
+int sd_rtnl_message_addr_set_prefixlen(sd_netlink_message *m, unsigned char prefixlen) {
+        struct ifaddrmsg *ifa;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+
+        ifa = NLMSG_DATA(m->hdr);
+
+        if ((ifa->ifa_family == AF_INET && prefixlen > 32) ||
+            (ifa->ifa_family == AF_INET6 && prefixlen > 128))
+                return -ERANGE;
+
+        ifa->ifa_prefixlen = prefixlen;
+
+        return 0;
+}
+
+int sd_rtnl_message_addr_set_flags(sd_netlink_message *m, unsigned char flags) {
+        struct ifaddrmsg *ifa;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+
+        ifa = NLMSG_DATA(m->hdr);
+
+        ifa->ifa_flags = flags;
+
+        return 0;
+}
+
+int sd_rtnl_message_addr_set_scope(sd_netlink_message *m, unsigned char scope) {
+        struct ifaddrmsg *ifa;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+
+        ifa = NLMSG_DATA(m->hdr);
+
+        ifa->ifa_scope = scope;
+
+        return 0;
+}
+
+int sd_rtnl_message_addr_get_family(sd_netlink_message *m, int *family) {
+        struct ifaddrmsg *ifa;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+        assert_return(family, -EINVAL);
+
+        ifa = NLMSG_DATA(m->hdr);
+
+        *family = ifa->ifa_family;
+
+        return 0;
+}
+
+int sd_rtnl_message_addr_get_prefixlen(sd_netlink_message *m, unsigned char *prefixlen) {
+        struct ifaddrmsg *ifa;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+        assert_return(prefixlen, -EINVAL);
+
+        ifa = NLMSG_DATA(m->hdr);
+
+        *prefixlen = ifa->ifa_prefixlen;
+
+        return 0;
+}
+
+int sd_rtnl_message_addr_get_scope(sd_netlink_message *m, unsigned char *scope) {
+        struct ifaddrmsg *ifa;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+        assert_return(scope, -EINVAL);
+
+        ifa = NLMSG_DATA(m->hdr);
+
+        *scope = ifa->ifa_scope;
+
+        return 0;
+}
+
+int sd_rtnl_message_addr_get_flags(sd_netlink_message *m, unsigned char *flags) {
+        struct ifaddrmsg *ifa;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+        assert_return(flags, -EINVAL);
+
+        ifa = NLMSG_DATA(m->hdr);
+
+        *flags = ifa->ifa_flags;
+
+        return 0;
+}
+
+int sd_rtnl_message_addr_get_ifindex(sd_netlink_message *m, int *ifindex) {
+        struct ifaddrmsg *ifa;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
+        assert_return(ifindex, -EINVAL);
+
+        ifa = NLMSG_DATA(m->hdr);
+
+        *ifindex = ifa->ifa_index;
+
+        return 0;
+}
+
+int sd_rtnl_message_new_addr(sd_netlink *rtnl, sd_netlink_message **ret,
+                             uint16_t nlmsg_type, int index,
+                             int family) {
+        struct ifaddrmsg *ifa;
+        int r;
+
+        assert_return(rtnl_message_type_is_addr(nlmsg_type), -EINVAL);
+        assert_return((nlmsg_type == RTM_GETADDR && index == 0) ||
+                      index > 0, -EINVAL);
+        assert_return((nlmsg_type == RTM_GETADDR && family == AF_UNSPEC) ||
+                      family == AF_INET || family == AF_INET6, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        r = message_new(rtnl, ret, nlmsg_type);
+        if (r < 0)
+                return r;
+
+        if (nlmsg_type == RTM_GETADDR)
+                (*ret)->hdr->nlmsg_flags |= NLM_F_DUMP;
+
+        ifa = NLMSG_DATA((*ret)->hdr);
+
+        ifa->ifa_index = index;
+        ifa->ifa_family = family;
+        if (family == AF_INET)
+                ifa->ifa_prefixlen = 32;
+        else if (family == AF_INET6)
+                ifa->ifa_prefixlen = 128;
+
+        return 0;
+}
+
+int sd_rtnl_message_new_addr_update(sd_netlink *rtnl, sd_netlink_message **ret,
+                             int index, int family) {
+        int r;
+
+        r = sd_rtnl_message_new_addr(rtnl, ret, RTM_NEWADDR, index, family);
+        if (r < 0)
+                return r;
+
+        (*ret)->hdr->nlmsg_flags |= NLM_F_REPLACE;
+
+        return 0;
+}
+
+int sd_rtnl_message_link_get_ifindex(sd_netlink_message *m, int *ifindex) {
+        struct ifinfomsg *ifi;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_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_netlink_message *m, unsigned *flags) {
+        struct ifinfomsg *ifi;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
+        assert_return(flags, -EINVAL);
+
+        ifi = NLMSG_DATA(m->hdr);
+
+        *flags = ifi->ifi_flags;
+
+        return 0;
+}
+
+int sd_rtnl_message_link_get_type(sd_netlink_message *m, unsigned *type) {
+        struct ifinfomsg *ifi;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->hdr, -EINVAL);
+        assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
+        assert_return(type, -EINVAL);
+
+        ifi = NLMSG_DATA(m->hdr);
+
+        *type = ifi->ifi_type;
+
+        return 0;
+}
+
+int sd_rtnl_message_get_family(sd_netlink_message *m, int *family) {
+        assert_return(m, -EINVAL);
+        assert_return(family, -EINVAL);
+
+        assert(m->hdr);
+
+        if (rtnl_message_type_is_link(m->hdr->nlmsg_type)) {
+                struct ifinfomsg *ifi;
+
+                ifi = NLMSG_DATA(m->hdr);
+
+                *family = ifi->ifi_family;
+
+                return 0;
+        } else if (rtnl_message_type_is_route(m->hdr->nlmsg_type)) {
+                struct rtmsg *rtm;
+
+                rtm = NLMSG_DATA(m->hdr);
+
+                *family = rtm->rtm_family;
+
+                return 0;
+        } else if (rtnl_message_type_is_neigh(m->hdr->nlmsg_type)) {
+                struct ndmsg *ndm;
+
+                ndm = NLMSG_DATA(m->hdr);
+
+                *family = ndm->ndm_family;
+
+                return 0;
+        } else if (rtnl_message_type_is_addr(m->hdr->nlmsg_type)) {
+                struct ifaddrmsg *ifa;
+
+                ifa = NLMSG_DATA(m->hdr);
+
+                *family = ifa->ifa_family;
+
+                return 0;
+        }
+
+        return -EOPNOTSUPP;
+}