1616 lines
46 KiB
C
1616 lines
46 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Tom Gundersen <teg@jklm.no>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <netinet/in.h>
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#include <netinet/ether.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include "util.h"
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#include "refcnt.h"
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#include "missing.h"
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#include "sd-rtnl.h"
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#include "rtnl-util.h"
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#include "rtnl-internal.h"
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#include "rtnl-types.h"
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#define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL)
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#define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr;
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#define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK)
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static int message_new_empty(sd_rtnl *rtnl, sd_rtnl_message **ret) {
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sd_rtnl_message *m;
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assert_return(ret, -EINVAL);
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/* Note that 'rtnl' is currently unused, if we start using it internally
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we must take care to avoid problems due to mutual references between
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busses and their queued messages. See sd-bus.
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*/
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m = new0(sd_rtnl_message, 1);
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if (!m)
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return -ENOMEM;
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m->n_ref = REFCNT_INIT;
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m->sealed = false;
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*ret = m;
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return 0;
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}
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int message_new(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t type) {
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_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
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const NLType *nl_type;
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size_t size;
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int r;
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r = type_system_get_type(NULL, &nl_type, type);
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if (r < 0)
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return r;
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assert(nl_type->type == NLA_NESTED);
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r = message_new_empty(rtnl, &m);
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if (r < 0)
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return r;
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size = NLMSG_SPACE(nl_type->size);
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assert(size >= sizeof(struct nlmsghdr));
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m->hdr = malloc0(size);
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if (!m->hdr)
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return -ENOMEM;
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m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
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m->container_type_system[0] = nl_type->type_system;
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m->hdr->nlmsg_len = size;
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m->hdr->nlmsg_type = type;
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*ret = m;
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m = NULL;
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return 0;
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}
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int sd_rtnl_message_route_set_dst_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) {
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struct rtmsg *rtm;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
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rtm = NLMSG_DATA(m->hdr);
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if ((rtm->rtm_family == AF_INET && prefixlen > 32) ||
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(rtm->rtm_family == AF_INET6 && prefixlen > 128))
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return -ERANGE;
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rtm->rtm_dst_len = prefixlen;
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return 0;
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}
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int sd_rtnl_message_route_set_src_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) {
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struct rtmsg *rtm;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
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rtm = NLMSG_DATA(m->hdr);
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if ((rtm->rtm_family == AF_INET && prefixlen > 32) ||
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(rtm->rtm_family == AF_INET6 && prefixlen > 128))
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return -ERANGE;
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rtm->rtm_src_len = prefixlen;
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return 0;
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}
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int sd_rtnl_message_route_set_scope(sd_rtnl_message *m, unsigned char scope) {
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struct rtmsg *rtm;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
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rtm = NLMSG_DATA(m->hdr);
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rtm->rtm_scope = scope;
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return 0;
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}
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int sd_rtnl_message_route_get_family(sd_rtnl_message *m, int *family) {
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struct rtmsg *rtm;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
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assert_return(family, -EINVAL);
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rtm = NLMSG_DATA(m->hdr);
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*family = rtm->rtm_family;
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return 0;
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}
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int sd_rtnl_message_route_get_dst_prefixlen(sd_rtnl_message *m, unsigned char *dst_len) {
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struct rtmsg *rtm;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
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assert_return(dst_len, -EINVAL);
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rtm = NLMSG_DATA(m->hdr);
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*dst_len = rtm->rtm_dst_len;
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return 0;
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}
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int sd_rtnl_message_route_get_src_prefixlen(sd_rtnl_message *m, unsigned char *src_len) {
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struct rtmsg *rtm;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_route(m->hdr->nlmsg_type), -EINVAL);
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assert_return(src_len, -EINVAL);
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rtm = NLMSG_DATA(m->hdr);
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*src_len = rtm->rtm_src_len;
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return 0;
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}
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int sd_rtnl_message_new_route(sd_rtnl *rtnl, sd_rtnl_message **ret,
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uint16_t nlmsg_type, int rtm_family,
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unsigned char rtm_protocol) {
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struct rtmsg *rtm;
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int r;
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assert_return(rtnl_message_type_is_route(nlmsg_type), -EINVAL);
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assert_return((nlmsg_type == RTM_GETROUTE && rtm_family == AF_UNSPEC) ||
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rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL);
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assert_return(ret, -EINVAL);
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r = message_new(rtnl, ret, nlmsg_type);
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if (r < 0)
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return r;
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if (nlmsg_type == RTM_NEWROUTE)
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(*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND;
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rtm = NLMSG_DATA((*ret)->hdr);
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rtm->rtm_family = rtm_family;
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rtm->rtm_scope = RT_SCOPE_UNIVERSE;
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rtm->rtm_type = RTN_UNICAST;
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rtm->rtm_table = RT_TABLE_MAIN;
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rtm->rtm_protocol = rtm_protocol;
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return 0;
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}
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int sd_rtnl_message_neigh_set_flags(sd_rtnl_message *m, uint8_t flags) {
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struct ndmsg *ndm;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
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ndm = NLMSG_DATA(m->hdr);
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ndm->ndm_flags |= flags;
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return 0;
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}
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int sd_rtnl_message_neigh_set_state(sd_rtnl_message *m, uint16_t state) {
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struct ndmsg *ndm;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
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ndm = NLMSG_DATA(m->hdr);
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ndm->ndm_state |= state;
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return 0;
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}
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int sd_rtnl_message_neigh_get_flags(sd_rtnl_message *m, uint8_t *flags) {
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struct ndmsg *ndm;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
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ndm = NLMSG_DATA(m->hdr);
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*flags = ndm->ndm_flags;
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return 0;
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}
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int sd_rtnl_message_neigh_get_state(sd_rtnl_message *m, uint16_t *state) {
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struct ndmsg *ndm;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
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ndm = NLMSG_DATA(m->hdr);
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*state = ndm->ndm_state;
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return 0;
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}
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int sd_rtnl_message_neigh_get_family(sd_rtnl_message *m, int *family) {
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struct ndmsg *ndm;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
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assert_return(family, -EINVAL);
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ndm = NLMSG_DATA(m->hdr);
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*family = ndm->ndm_family;
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return 0;
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}
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int sd_rtnl_message_neigh_get_ifindex(sd_rtnl_message *m, int *index) {
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struct ndmsg *ndm;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_neigh(m->hdr->nlmsg_type), -EINVAL);
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assert_return(index, -EINVAL);
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ndm = NLMSG_DATA(m->hdr);
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*index = ndm->ndm_ifindex;
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return 0;
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}
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int sd_rtnl_message_new_neigh(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t nlmsg_type, int index, int ndm_family) {
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struct ndmsg *ndm;
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int r;
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assert_return(rtnl_message_type_is_neigh(nlmsg_type), -EINVAL);
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assert_return(ndm_family == AF_INET ||
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ndm_family == AF_INET6 ||
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ndm_family == PF_BRIDGE, -EINVAL);
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assert_return(ret, -EINVAL);
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r = message_new(rtnl, ret, nlmsg_type);
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if (r < 0)
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return r;
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if (nlmsg_type == RTM_NEWNEIGH)
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(*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_APPEND;
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ndm = NLMSG_DATA((*ret)->hdr);
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ndm->ndm_family = ndm_family;
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ndm->ndm_ifindex = index;
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return 0;
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}
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int sd_rtnl_message_link_set_flags(sd_rtnl_message *m, unsigned flags, unsigned change) {
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struct ifinfomsg *ifi;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
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assert_return(change, -EINVAL);
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ifi = NLMSG_DATA(m->hdr);
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ifi->ifi_flags = flags;
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ifi->ifi_change = change;
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return 0;
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}
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int sd_rtnl_message_link_set_type(sd_rtnl_message *m, unsigned type) {
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struct ifinfomsg *ifi;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
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ifi = NLMSG_DATA(m->hdr);
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ifi->ifi_type = type;
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return 0;
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}
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int sd_rtnl_message_link_set_family(sd_rtnl_message *m, unsigned family) {
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struct ifinfomsg *ifi;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_link(m->hdr->nlmsg_type), -EINVAL);
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ifi = NLMSG_DATA(m->hdr);
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ifi->ifi_family = family;
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return 0;
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}
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int sd_rtnl_message_new_link(sd_rtnl *rtnl, sd_rtnl_message **ret,
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uint16_t nlmsg_type, int index) {
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struct ifinfomsg *ifi;
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int r;
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assert_return(rtnl_message_type_is_link(nlmsg_type), -EINVAL);
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assert_return(nlmsg_type != RTM_DELLINK || index > 0, -EINVAL);
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assert_return(ret, -EINVAL);
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r = message_new(rtnl, ret, nlmsg_type);
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if (r < 0)
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return r;
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if (nlmsg_type == RTM_NEWLINK)
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(*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
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ifi = NLMSG_DATA((*ret)->hdr);
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ifi->ifi_family = AF_UNSPEC;
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ifi->ifi_index = index;
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return 0;
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}
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int sd_rtnl_message_request_dump(sd_rtnl_message *m, int dump) {
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(m->hdr->nlmsg_type == RTM_GETLINK ||
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m->hdr->nlmsg_type == RTM_GETADDR ||
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m->hdr->nlmsg_type == RTM_GETROUTE ||
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m->hdr->nlmsg_type == RTM_GETNEIGH,
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-EINVAL);
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if (dump)
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m->hdr->nlmsg_flags |= NLM_F_DUMP;
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else
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m->hdr->nlmsg_flags &= ~NLM_F_DUMP;
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return 0;
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}
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int sd_rtnl_message_addr_set_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) {
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struct ifaddrmsg *ifa;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
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ifa = NLMSG_DATA(m->hdr);
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if ((ifa->ifa_family == AF_INET && prefixlen > 32) ||
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(ifa->ifa_family == AF_INET6 && prefixlen > 128))
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return -ERANGE;
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ifa->ifa_prefixlen = prefixlen;
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return 0;
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}
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int sd_rtnl_message_addr_set_flags(sd_rtnl_message *m, unsigned char flags) {
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struct ifaddrmsg *ifa;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
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ifa = NLMSG_DATA(m->hdr);
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ifa->ifa_flags = flags;
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return 0;
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}
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int sd_rtnl_message_addr_set_scope(sd_rtnl_message *m, unsigned char scope) {
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struct ifaddrmsg *ifa;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
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ifa = NLMSG_DATA(m->hdr);
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ifa->ifa_scope = scope;
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return 0;
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}
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int sd_rtnl_message_addr_get_family(sd_rtnl_message *m, int *family) {
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struct ifaddrmsg *ifa;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
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assert_return(family, -EINVAL);
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ifa = NLMSG_DATA(m->hdr);
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*family = ifa->ifa_family;
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return 0;
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}
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int sd_rtnl_message_addr_get_prefixlen(sd_rtnl_message *m, unsigned char *prefixlen) {
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struct ifaddrmsg *ifa;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
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assert_return(prefixlen, -EINVAL);
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ifa = NLMSG_DATA(m->hdr);
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*prefixlen = ifa->ifa_prefixlen;
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return 0;
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}
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int sd_rtnl_message_addr_get_scope(sd_rtnl_message *m, unsigned char *scope) {
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struct ifaddrmsg *ifa;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
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assert_return(scope, -EINVAL);
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ifa = NLMSG_DATA(m->hdr);
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*scope = ifa->ifa_scope;
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return 0;
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}
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int sd_rtnl_message_addr_get_flags(sd_rtnl_message *m, unsigned char *flags) {
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struct ifaddrmsg *ifa;
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assert_return(m, -EINVAL);
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assert_return(m->hdr, -EINVAL);
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assert_return(rtnl_message_type_is_addr(m->hdr->nlmsg_type), -EINVAL);
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assert_return(flags, -EINVAL);
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|
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_is_broadcast(sd_rtnl_message *m) {
|
|
assert_return(m, -EINVAL);
|
|
|
|
return !m->hdr->nlmsg_pid;
|
|
}
|
|
|
|
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)
|
|
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;
|
|
const char *key;
|
|
|
|
r = type_system_get_type_system_union(m->container_type_system[m->n_containers],
|
|
&type_system_union,
|
|
type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
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;
|
|
} 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;
|
|
} else if (r == 0)
|
|
/* connection was closed by the kernel */
|
|
return -ECONNRESET;
|
|
|
|
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 %u", 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, &group, 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;
|
|
|
|
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 == -ENOTSUP)
|
|
log_debug("sd-rtnl: ignored message with unknown type: %u",
|
|
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->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;
|
|
}
|