+++ /dev/null
-/*-*- 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 "refcnt.h"
-#include "missing.h"
-
-#include "sd-rtnl.h"
-#include "rtnl-util.h"
-#include "rtnl-internal.h"
-#include "rtnl-types.h"
-
-#define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL)
-#define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr;
-
-#define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK)
-
-static int message_new_empty(sd_rtnl *rtnl, sd_rtnl_message **ret) {
- sd_rtnl_message *m;
-
- assert_return(ret, -EINVAL);
-
- /* Note that 'rtnl' is currently unused, if we start using it internally
- we must take care to avoid problems due to mutual references between
- busses and their queued messages. See sd-bus.
- */
-
- m = new0(sd_rtnl_message, 1);
- if (!m)
- return -ENOMEM;
-
- m->n_ref = REFCNT_INIT;
-
- m->sealed = false;
-
- *ret = m;
-
- return 0;
-}
-
-int message_new(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t type) {
- _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
- const NLType *nl_type;
- size_t size;
- int r;
-
- r = type_system_get_type(NULL, &nl_type, type);
- if (r < 0)
- return r;
-
- r = message_new_empty(rtnl, &m);
- if (r < 0)
- return r;
-
- size = NLMSG_SPACE(nl_type->size);
-
- assert(size >= sizeof(struct nlmsghdr));
- m->hdr = malloc0(size);
- if (!m->hdr)
- return -ENOMEM;
-
- m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
-
- m->container_type_system[0] = nl_type->type_system;
- m->hdr->nlmsg_len = size;
- m->hdr->nlmsg_type = type;
-
- *ret = m;
- m = NULL;
-
- return 0;
-}
-
-int sd_rtnl_message_route_set_dst_prefixlen(sd_rtnl_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_rtnl_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_rtnl_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_rtnl_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_rtnl_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_rtnl_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_rtnl *rtnl, sd_rtnl_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_rtnl_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_rtnl_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_rtnl_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_rtnl_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_rtnl_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_rtnl_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_rtnl *rtnl, sd_rtnl_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_rtnl_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_rtnl_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_rtnl_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_rtnl *rtnl, sd_rtnl_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_request_dump(sd_rtnl_message *m, int dump) {
- assert_return(m, -EINVAL);
- assert_return(m->hdr, -EINVAL);
- assert_return(m->hdr->nlmsg_type == RTM_GETLINK ||
- m->hdr->nlmsg_type == RTM_GETADDR ||
- m->hdr->nlmsg_type == RTM_GETROUTE ||
- m->hdr->nlmsg_type == RTM_GETNEIGH,
- -EINVAL);
-
- if (dump)
- m->hdr->nlmsg_flags |= NLM_F_DUMP;
- else
- m->hdr->nlmsg_flags &= ~NLM_F_DUMP;
-
- return 0;
-}
-
-int sd_rtnl_message_addr_set_prefixlen(sd_rtnl_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_rtnl_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_rtnl_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_rtnl_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_rtnl_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_rtnl_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_rtnl_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_rtnl_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_rtnl *rtnl, sd_rtnl_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_rtnl *rtnl, sd_rtnl_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_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) {
- unsigned i;
-
- free(m->hdr);
-
- for (i = 0; i <= m->n_containers; i++)
- free(m->rta_offset_tb[i]);
-
- sd_rtnl_message_unref(m->next);
-
- 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_get_family(sd_rtnl_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_rtnl_message_is_broadcast(sd_rtnl_message *m) {
- assert_return(m, -EINVAL);
-
- return m->broadcast;
-}
-
-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(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_rtnl_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_rtnl_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_rtnl_message *m, unsigned short type, const void *data, size_t data_length) {
- uint32_t rta_length;
- size_t message_length, padding_length;
- struct nlmsghdr *new_hdr;
- struct rtattr *rta;
- char *padding;
- unsigned i;
- int offset;
-
- assert(m);
- assert(m->hdr);
- assert(!m->sealed);
- assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len);
- assert(!data || data_length);
-
- /* get offset of the new attribute */
- offset = m->hdr->nlmsg_len;
-
- /* 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 = offset + 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 + offset);
-
- /* if we are inside containers, extend them */
- for (i = 0; i < m->n_containers; i++)
- GET_CONTAINER(m, i)->rta_len += message_length - offset;
-
- /* fill in the attribute */
- rta->rta_type = type;
- rta->rta_len = rta_length;
- if (data)
- /* 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);
- else {
- /* if no data was passed, make sure we still initialize the padding
- note that we can have data_length > 0 (used by some containers) */
- padding = RTA_DATA(rta);
- }
-
- /* make sure also the padding at the end of the message is initialized */
- padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding;
- memzero(padding, padding_length);
-
- /* update message size */
- m->hdr->nlmsg_len = message_length;
-
- return offset;
-}
-
-static int message_attribute_has_type(sd_rtnl_message *m, uint16_t attribute_type, uint16_t data_type) {
- const NLType *type;
- int r;
-
- r = type_system_get_type(m->container_type_system[m->n_containers], &type, attribute_type);
- if (r < 0)
- return r;
-
- if (type->type != data_type)
- return -EINVAL;
-
- return type->size;
-}
-
-int sd_rtnl_message_append_string(sd_rtnl_message *m, unsigned short type, const char *data) {
- size_t length, size;
- int r;
-
- assert_return(m, -EINVAL);
- assert_return(!m->sealed, -EPERM);
- assert_return(data, -EINVAL);
-
- r = message_attribute_has_type(m, type, NLA_STRING);
- if (r < 0)
- return r;
- else
- size = (size_t)r;
-
- if (size) {
- length = strnlen(data, size+1);
- if (length > size)
- return -EINVAL;
- } else
- length = strlen(data);
-
- r = add_rtattr(m, type, data, length + 1);
- if (r < 0)
- return r;
-
- return 0;
-}
-
-int sd_rtnl_message_append_u8(sd_rtnl_message *m, unsigned short type, uint8_t data) {
- int r;
-
- assert_return(m, -EINVAL);
- assert_return(!m->sealed, -EPERM);
-
- r = message_attribute_has_type(m, type, NLA_U8);
- if (r < 0)
- return r;
-
- r = add_rtattr(m, type, &data, sizeof(uint8_t));
- if (r < 0)
- return r;
-
- return 0;
-}
-
-
-int sd_rtnl_message_append_u16(sd_rtnl_message *m, unsigned short type, uint16_t data) {
- int r;
-
- assert_return(m, -EINVAL);
- assert_return(!m->sealed, -EPERM);
-
- r = message_attribute_has_type(m, type, NLA_U16);
- if (r < 0)
- return r;
-
- r = add_rtattr(m, type, &data, sizeof(uint16_t));
- if (r < 0)
- return r;
-
- return 0;
-}
-
-int sd_rtnl_message_append_u32(sd_rtnl_message *m, unsigned short type, uint32_t data) {
- int r;
-
- assert_return(m, -EINVAL);
- assert_return(!m->sealed, -EPERM);
-
- r = message_attribute_has_type(m, type, NLA_U32);
- if (r < 0)
- return r;
-
- 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) {
- int r;
-
- assert_return(m, -EINVAL);
- assert_return(!m->sealed, -EPERM);
- assert_return(data, -EINVAL);
-
- r = message_attribute_has_type(m, type, NLA_IN_ADDR);
- if (r < 0)
- return r;
-
- 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) {
- int r;
-
- assert_return(m, -EINVAL);
- assert_return(!m->sealed, -EPERM);
- assert_return(data, -EINVAL);
-
- r = message_attribute_has_type(m, type, NLA_IN_ADDR);
- if (r < 0)
- return r;
-
- 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) {
- int r;
-
- assert_return(m, -EINVAL);
- assert_return(!m->sealed, -EPERM);
- assert_return(data, -EINVAL);
-
- r = message_attribute_has_type(m, type, NLA_ETHER_ADDR);
- if (r < 0)
- return r;
-
- r = add_rtattr(m, type, data, ETH_ALEN);
- if (r < 0)
- return r;
-
- return 0;
-}
-
-int sd_rtnl_message_append_cache_info(sd_rtnl_message *m, unsigned short type, const struct ifa_cacheinfo *info) {
- int r;
-
- assert_return(m, -EINVAL);
- assert_return(!m->sealed, -EPERM);
- assert_return(info, -EINVAL);
-
- r = message_attribute_has_type(m, type, NLA_CACHE_INFO);
- if (r < 0)
- return r;
-
- r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo));
- if (r < 0)
- return r;
-
- return 0;
-}
-
-int sd_rtnl_message_open_container(sd_rtnl_message *m, unsigned short type) {
- size_t size;
- int r;
-
- assert_return(m, -EINVAL);
- assert_return(!m->sealed, -EPERM);
- assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE);
-
- r = message_attribute_has_type(m, type, NLA_NESTED);
- if (r < 0) {
- const NLTypeSystemUnion *type_system_union;
- int family;
-
- r = message_attribute_has_type(m, type, NLA_UNION);
- if (r < 0)
- return r;
- size = (size_t) r;
-
- r = sd_rtnl_message_get_family(m, &family);
- if (r < 0)
- return r;
-
- r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type);
- if (r < 0)
- return r;
-
- r = type_system_union_protocol_get_type_system(type_system_union,
- &m->container_type_system[m->n_containers + 1],
- family);
- if (r < 0)
- return r;
- } else {
- size = (size_t)r;
-
- r = type_system_get_type_system(m->container_type_system[m->n_containers],
- &m->container_type_system[m->n_containers + 1],
- type);
- if (r < 0)
- return r;
- }
-
- r = add_rtattr(m, type | NLA_F_NESTED, NULL, size);
- if (r < 0)
- return r;
-
- m->container_offsets[m->n_containers ++] = r;
-
- return 0;
-}
-
-int sd_rtnl_message_open_container_union(sd_rtnl_message *m, unsigned short type, const char *key) {
- const NLTypeSystemUnion *type_system_union;
- int r;
-
- assert_return(m, -EINVAL);
- assert_return(!m->sealed, -EPERM);
-
- r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type);
- if (r < 0)
- return r;
-
- r = type_system_union_get_type_system(type_system_union,
- &m->container_type_system[m->n_containers + 1],
- key);
- if (r < 0)
- return r;
-
- r = sd_rtnl_message_append_string(m, type_system_union->match, key);
- if (r < 0)
- return r;
-
- /* do we evere need non-null size */
- r = add_rtattr(m, type, NULL, 0);
- if (r < 0)
- return r;
-
- m->container_offsets[m->n_containers ++] = r;
-
- return 0;
-}
-
-
-int sd_rtnl_message_close_container(sd_rtnl_message *m) {
- assert_return(m, -EINVAL);
- assert_return(!m->sealed, -EPERM);
- assert_return(m->n_containers > 0, -EINVAL);
-
- m->container_type_system[m->n_containers] = NULL;
- m->n_containers --;
-
- return 0;
-}
-
-int rtnl_message_read_internal(sd_rtnl_message *m, unsigned short type, void **data) {
- struct rtattr *rta;
-
- assert_return(m, -EINVAL);
- assert_return(m->sealed, -EPERM);
- assert_return(data, -EINVAL);
- assert(m->n_containers <= RTNL_CONTAINER_DEPTH);
- assert(m->rta_offset_tb[m->n_containers]);
- assert(type < m->rta_tb_size[m->n_containers]);
-
- if(!m->rta_offset_tb[m->n_containers][type])
- return -ENODATA;
-
- rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[m->n_containers][type]);
-
- *data = RTA_DATA(rta);
-
- return RTA_PAYLOAD(rta);
-}
-
-int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, const char **data) {
- int r;
- void *attr_data;
-
- assert_return(m, -EINVAL);
-
- r = message_attribute_has_type(m, type, NLA_STRING);
- if (r < 0)
- return r;
-
- r = rtnl_message_read_internal(m, type, &attr_data);
- if (r < 0)
- return r;
- else if (strnlen(attr_data, r) >= (size_t) r)
- return -EIO;
-
- if (data)
- *data = (const char *) attr_data;
-
- return 0;
-}
-
-int sd_rtnl_message_read_u8(sd_rtnl_message *m, unsigned short type, uint8_t *data) {
- int r;
- void *attr_data;
-
- assert_return(m, -EINVAL);
-
- r = message_attribute_has_type(m, type, NLA_U8);
- if (r < 0)
- return r;
-
- r = rtnl_message_read_internal(m, type, &attr_data);
- if (r < 0)
- return r;
- else if ((size_t) r < sizeof(uint8_t))
- return -EIO;
-
- if (data)
- *data = *(uint8_t *) attr_data;
-
- return 0;
-}
-
-int sd_rtnl_message_read_u16(sd_rtnl_message *m, unsigned short type, uint16_t *data) {
- int r;
- void *attr_data;
-
- assert_return(m, -EINVAL);
-
- r = message_attribute_has_type(m, type, NLA_U16);
- if (r < 0)
- return r;
-
- r = rtnl_message_read_internal(m, type, &attr_data);
- if (r < 0)
- return r;
- else if ((size_t) r < sizeof(uint16_t))
- return -EIO;
-
- if (data)
- *data = *(uint16_t *) attr_data;
-
- return 0;
-}
-
-int sd_rtnl_message_read_u32(sd_rtnl_message *m, unsigned short type, uint32_t *data) {
- int r;
- void *attr_data;
-
- assert_return(m, -EINVAL);
-
- r = message_attribute_has_type(m, type, NLA_U32);
- if (r < 0)
- return r;
-
- r = rtnl_message_read_internal(m, type, &attr_data);
- if (r < 0)
- return r;
- else if ((size_t)r < sizeof(uint32_t))
- return -EIO;
-
- if (data)
- *data = *(uint32_t *) attr_data;
-
- return 0;
-}
-
-int sd_rtnl_message_read_ether_addr(sd_rtnl_message *m, unsigned short type, struct ether_addr *data) {
- int r;
- void *attr_data;
-
- assert_return(m, -EINVAL);
-
- r = message_attribute_has_type(m, type, NLA_ETHER_ADDR);
- if (r < 0)
- return r;
-
- r = rtnl_message_read_internal(m, type, &attr_data);
- if (r < 0)
- return r;
- else if ((size_t)r < sizeof(struct ether_addr))
- return -EIO;
-
- if (data)
- memcpy(data, attr_data, sizeof(struct ether_addr));
-
- return 0;
-}
-
-int sd_rtnl_message_read_cache_info(sd_rtnl_message *m, unsigned short type, struct ifa_cacheinfo *info) {
- int r;
- void *attr_data;
-
- assert_return(m, -EINVAL);
-
- r = message_attribute_has_type(m, type, NLA_CACHE_INFO);
- if (r < 0)
- return r;
-
- r = rtnl_message_read_internal(m, type, &attr_data);
- if (r < 0)
- return r;
- else if ((size_t)r < sizeof(struct ifa_cacheinfo))
- return -EIO;
-
- if (info)
- memcpy(info, attr_data, sizeof(struct ifa_cacheinfo));
-
- return 0;
-}
-
-int sd_rtnl_message_read_in_addr(sd_rtnl_message *m, unsigned short type, struct in_addr *data) {
- int r;
- void *attr_data;
-
- assert_return(m, -EINVAL);
-
- r = message_attribute_has_type(m, type, NLA_IN_ADDR);
- if (r < 0)
- return r;
-
- r = rtnl_message_read_internal(m, type, &attr_data);
- if (r < 0)
- return r;
- else if ((size_t)r < sizeof(struct in_addr))
- return -EIO;
-
- if (data)
- memcpy(data, attr_data, sizeof(struct in_addr));
-
- return 0;
-}
-
-int sd_rtnl_message_read_in6_addr(sd_rtnl_message *m, unsigned short type, struct in6_addr *data) {
- int r;
- void *attr_data;
-
- assert_return(m, -EINVAL);
-
- r = message_attribute_has_type(m, type, NLA_IN_ADDR);
- if (r < 0)
- return r;
-
- r = rtnl_message_read_internal(m, type, &attr_data);
- if (r < 0)
- return r;
- else if ((size_t)r < sizeof(struct in6_addr))
- return -EIO;
-
- if (data)
- memcpy(data, attr_data, sizeof(struct in6_addr));
-
- return 0;
-}
-
-int sd_rtnl_message_enter_container(sd_rtnl_message *m, unsigned short type) {
- const NLType *nl_type;
- const NLTypeSystem *type_system;
- void *container;
- size_t size;
- int r;
-
- assert_return(m, -EINVAL);
- assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL);
-
- r = type_system_get_type(m->container_type_system[m->n_containers],
- &nl_type,
- type);
- if (r < 0)
- return r;
-
- if (nl_type->type == NLA_NESTED) {
- r = type_system_get_type_system(m->container_type_system[m->n_containers],
- &type_system,
- type);
- if (r < 0)
- return r;
- } else if (nl_type->type == NLA_UNION) {
- const NLTypeSystemUnion *type_system_union;
-
- r = type_system_get_type_system_union(m->container_type_system[m->n_containers],
- &type_system_union,
- type);
- if (r < 0)
- return r;
-
- switch (type_system_union->match_type) {
- case NL_MATCH_SIBLING:
- {
- const char *key;
-
- r = sd_rtnl_message_read_string(m, type_system_union->match, &key);
- if (r < 0)
- return r;
-
- r = type_system_union_get_type_system(type_system_union,
- &type_system,
- key);
- if (r < 0)
- return r;
-
- break;
- }
- case NL_MATCH_PROTOCOL:
- {
- int family;
-
- r = sd_rtnl_message_get_family(m, &family);
- if (r < 0)
- return r;
-
- r = type_system_union_protocol_get_type_system(type_system_union,
- &type_system,
- family);
- if (r < 0)
- return r;
-
- break;
- }
- default:
- assert_not_reached("sd-rtnl: invalid type system union type");
- }
- } else
- return -EINVAL;
-
- r = rtnl_message_read_internal(m, type, &container);
- if (r < 0)
- return r;
- else
- size = (size_t)r;
-
- m->n_containers ++;
-
- r = rtnl_message_parse(m,
- &m->rta_offset_tb[m->n_containers],
- &m->rta_tb_size[m->n_containers],
- type_system->max,
- container,
- size);
- if (r < 0) {
- m->n_containers --;
- return r;
- }
-
- m->container_type_system[m->n_containers] = type_system;
-
- return 0;
-}
-
-int sd_rtnl_message_exit_container(sd_rtnl_message *m) {
- assert_return(m, -EINVAL);
- assert_return(m->sealed, -EINVAL);
- assert_return(m->n_containers > 0, -EINVAL);
-
- free(m->rta_offset_tb[m->n_containers]);
- m->rta_offset_tb[m->n_containers] = NULL;
- m->container_type_system[m->n_containers] = NULL;
-
- m->n_containers --;
-
- return 0;
-}
-
-uint32_t rtnl_message_get_serial(sd_rtnl_message *m) {
- assert(m);
- assert(m->hdr);
-
- return m->hdr->nlmsg_seq;
-}
-
-int sd_rtnl_message_is_error(sd_rtnl_message *m) {
- assert_return(m, 0);
- assert_return(m->hdr, 0);
-
- return m->hdr->nlmsg_type == NLMSG_ERROR;
-}
-
-int sd_rtnl_message_get_errno(sd_rtnl_message *m) {
- struct nlmsgerr *err;
-
- assert_return(m, -EINVAL);
- assert_return(m->hdr, -EINVAL);
-
- if (!sd_rtnl_message_is_error(m))
- return 0;
-
- err = NLMSG_DATA(m->hdr);
-
- return err->error;
-}
-
-int rtnl_message_parse(sd_rtnl_message *m,
- size_t **rta_offset_tb,
- unsigned short *rta_tb_size,
- int max,
- struct rtattr *rta,
- unsigned int rt_len) {
- unsigned short type;
- size_t *tb;
-
- tb = new0(size_t, max + 1);
- if(!tb)
- return -ENOMEM;
-
- *rta_tb_size = max + 1;
-
- for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) {
- type = RTA_TYPE(rta);
-
- /* if the kernel is newer than the headers we used
- when building, we ignore out-of-range attributes
- */
- if (type > max)
- continue;
-
- if (tb[type])
- log_debug("rtnl: message parse - overwriting repeated attribute");
-
- tb[type] = (uint8_t *) rta - (uint8_t *) m->hdr;
- }
-
- *rta_offset_tb = tb;
-
- 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;
-}
-
-static int socket_recv_message(int fd, struct iovec *iov, uint32_t *_group, bool peek) {
- uint8_t cred_buffer[CMSG_SPACE(sizeof(struct ucred)) +
- CMSG_SPACE(sizeof(struct nl_pktinfo))];
- struct msghdr msg = {
- .msg_iov = iov,
- .msg_iovlen = 1,
- .msg_control = cred_buffer,
- .msg_controllen = sizeof(cred_buffer),
- };
- struct cmsghdr *cmsg;
- uint32_t group = 0;
- bool auth = false;
- 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;
- }
-
- for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
- if (cmsg->cmsg_level == SOL_SOCKET &&
- cmsg->cmsg_type == SCM_CREDENTIALS &&
- cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) {
- struct ucred *ucred = (void *)CMSG_DATA(cmsg);
-
- /* from the kernel */
- if (ucred->pid == 0)
- auth = true;
- else
- log_debug("rtnl: ignoring message from PID "PID_FMT, ucred->pid);
- } else 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 (!auth) {
- /* not from the kernel, ignore */
- if (peek) {
- /* drop the message */
- r = recvmsg(fd, &msg, 0);
- if (r < 0)
- return (errno == EAGAIN || errno == EINTR) ? 0 : -errno;
- }
-
- return 0;
- }
-
- 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_rtnl *rtnl) {
- _cleanup_rtnl_message_unref_ sd_rtnl_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_rtnl_message_unref_ sd_rtnl_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-rtnl: 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-rtnl: 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_rtnl_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-rtnl: 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_rtnl_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_rtnl_message_rewind(sd_rtnl_message *m) {
- const NLType *type;
- unsigned i;
- int r;
-
- assert_return(m, -EINVAL);
-
- /* don't allow appending to message once parsed */
- if (!m->sealed)
- rtnl_message_seal(m);
-
- for (i = 1; i <= m->n_containers; i++) {
- free(m->rta_offset_tb[i]);
- m->rta_offset_tb[i] = NULL;
- m->rta_tb_size[i] = 0;
- m->container_type_system[i] = NULL;
- }
-
- m->n_containers = 0;
-
- if (m->rta_offset_tb[0]) {
- /* top-level attributes have already been parsed */
- return 0;
- }
-
- assert(m->hdr);
-
- r = type_system_get_type(NULL, &type, m->hdr->nlmsg_type);
- if (r < 0)
- return r;
-
- if (type->type == NLA_NESTED) {
- const NLTypeSystem *type_system = type->type_system;
-
- assert(type_system);
-
- m->container_type_system[0] = type_system;
-
- r = rtnl_message_parse(m,
- &m->rta_offset_tb[m->n_containers],
- &m->rta_tb_size[m->n_containers],
- type_system->max,
- (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) +
- NLMSG_ALIGN(type->size)),
- NLMSG_PAYLOAD(m->hdr, type->size));
- if (r < 0)
- return r;
- }
-
- return 0;
-}
-
-void rtnl_message_seal(sd_rtnl_message *m) {
- assert(m);
- assert(!m->sealed);
-
- m->sealed = true;
-}
-
-sd_rtnl_message *sd_rtnl_message_next(sd_rtnl_message *m) {
- assert_return(m, NULL);
-
- return m->next;
-}
~ianmdlvl / elogind.git / blobdiff