1050 lines
33 KiB
C
1050 lines
33 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
|
|
|
/***
|
|
This file is part of systemd.
|
|
|
|
Copyright 2013 Tom Gundersen <teg@jklm.no>
|
|
|
|
systemd is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
systemd is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
***/
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/ether.h>
|
|
#include <stdbool.h>
|
|
#include <unistd.h>
|
|
#include <linux/veth.h>
|
|
|
|
#include "util.h"
|
|
#include "refcnt.h"
|
|
#include "missing.h"
|
|
|
|
#include "sd-rtnl.h"
|
|
#include "rtnl-util.h"
|
|
#include "rtnl-internal.h"
|
|
|
|
#define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL)
|
|
#define NEXT_RTA(m) ((struct rtattr*)((uint8_t*)(m)->hdr + (m)->next_rta_offset))
|
|
#define UPDATE_RTA(m, new) (m)->next_rta_offset = (uint8_t*)(new) - (uint8_t*)(m)->hdr;
|
|
#define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr;
|
|
|
|
int message_new(sd_rtnl *rtnl, sd_rtnl_message **ret, size_t initial_size) {
|
|
sd_rtnl_message *m;
|
|
|
|
assert_return(ret, -EINVAL);
|
|
assert_return(initial_size >= sizeof(struct nlmsghdr), -EINVAL);
|
|
|
|
m = new0(sd_rtnl_message, 1);
|
|
if (!m)
|
|
return -ENOMEM;
|
|
|
|
m->hdr = malloc0(initial_size);
|
|
if (!m->hdr) {
|
|
free(m);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
m->n_ref = REFCNT_INIT;
|
|
|
|
m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
|
|
m->sealed = false;
|
|
|
|
if (rtnl)
|
|
m->rtnl = sd_rtnl_ref(rtnl);
|
|
|
|
*ret = m;
|
|
|
|
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_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_new_route(sd_rtnl *rtnl, sd_rtnl_message **ret,
|
|
uint16_t nlmsg_type, unsigned char rtm_family) {
|
|
struct rtmsg *rtm;
|
|
int r;
|
|
|
|
assert_return(rtnl_message_type_is_route(nlmsg_type), -EINVAL);
|
|
assert_return(rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL);
|
|
assert_return(ret, -EINVAL);
|
|
|
|
r = message_new(rtnl, ret, NLMSG_SPACE(sizeof(struct rtmsg)));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
(*ret)->hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
|
|
(*ret)->hdr->nlmsg_type = nlmsg_type;
|
|
if (nlmsg_type == RTM_NEWROUTE)
|
|
(*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
|
|
|
|
rtm = NLMSG_DATA((*ret)->hdr);
|
|
|
|
UPDATE_RTA(*ret, RTM_RTA(rtm));
|
|
|
|
rtm->rtm_family = rtm_family;
|
|
rtm->rtm_scope = RT_SCOPE_UNIVERSE;
|
|
rtm->rtm_type = RTN_UNICAST;
|
|
rtm->rtm_table = RT_TABLE_MAIN;
|
|
rtm->rtm_protocol = RTPROT_BOOT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_rtnl_message_link_set_flags(sd_rtnl_message *m, unsigned flags, 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_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_NEWLINK ||
|
|
nlmsg_type == RTM_SETLINK || index > 0, -EINVAL);
|
|
assert_return(ret, -EINVAL);
|
|
|
|
r = message_new(rtnl, ret, NLMSG_SPACE(sizeof(struct ifinfomsg)));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
(*ret)->hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
|
|
(*ret)->hdr->nlmsg_type = nlmsg_type;
|
|
if (nlmsg_type == RTM_NEWLINK)
|
|
(*ret)->hdr->nlmsg_flags |= NLM_F_CREATE;
|
|
|
|
ifi = NLMSG_DATA((*ret)->hdr);
|
|
|
|
ifi->ifi_family = AF_UNSPEC;
|
|
ifi->ifi_index = index;
|
|
|
|
UPDATE_RTA(*ret, IFLA_RTA(ifi));
|
|
|
|
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_new_addr(sd_rtnl *rtnl, sd_rtnl_message **ret,
|
|
uint16_t nlmsg_type, int index,
|
|
unsigned char family) {
|
|
struct ifaddrmsg *ifa;
|
|
int r;
|
|
|
|
assert_return(rtnl_message_type_is_addr(nlmsg_type), -EINVAL);
|
|
assert_return(index > 0, -EINVAL);
|
|
assert_return(family == AF_INET || family == AF_INET6, -EINVAL);
|
|
assert_return(ret, -EINVAL);
|
|
|
|
r = message_new(rtnl, ret, NLMSG_SPACE(sizeof(struct ifaddrmsg)));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
(*ret)->hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
|
|
(*ret)->hdr->nlmsg_type = nlmsg_type;
|
|
if (nlmsg_type == RTM_GETADDR && family == AF_INET)
|
|
(*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;
|
|
|
|
UPDATE_RTA(*ret, IFA_RTA(ifa));
|
|
|
|
return 0;
|
|
}
|
|
|
|
sd_rtnl_message *sd_rtnl_message_ref(sd_rtnl_message *m) {
|
|
if (m)
|
|
assert_se(REFCNT_INC(m->n_ref) >= 2);
|
|
|
|
return m;
|
|
}
|
|
|
|
sd_rtnl_message *sd_rtnl_message_unref(sd_rtnl_message *m) {
|
|
if (m && REFCNT_DEC(m->n_ref) <= 0) {
|
|
sd_rtnl_unref(m->rtnl);
|
|
free(m->hdr);
|
|
free(m);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int sd_rtnl_message_get_type(sd_rtnl_message *m, uint16_t *type) {
|
|
assert_return(m, -EINVAL);
|
|
assert_return(type, -EINVAL);
|
|
|
|
*type = m->hdr->nlmsg_type;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_rtnl_message_link_get_ifindex(sd_rtnl_message *m, int *ifindex) {
|
|
struct ifinfomsg *ifi;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(m->hdr, -EINVAL);
|
|
assert_return(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;
|
|
}
|
|
|
|
/* If successful the updated message will be correctly aligned, if
|
|
unsuccessful the old message is untouched. */
|
|
static int add_rtattr(sd_rtnl_message *m, unsigned short type, const void *data, size_t data_length) {
|
|
uint32_t rta_length, message_length;
|
|
struct nlmsghdr *new_hdr;
|
|
struct rtattr *rta;
|
|
char *padding;
|
|
unsigned i;
|
|
|
|
assert(m);
|
|
assert(m->hdr);
|
|
assert(!m->sealed);
|
|
assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len);
|
|
assert(!data || data_length > 0);
|
|
assert(data || m->n_containers < RTNL_CONTAINER_DEPTH);
|
|
|
|
/* get the size of the new rta attribute (with padding at the end) */
|
|
rta_length = RTA_LENGTH(data_length);
|
|
|
|
/* get the new message size (with padding at the end) */
|
|
message_length = m->hdr->nlmsg_len + RTA_ALIGN(rta_length);
|
|
|
|
/* realloc to fit the new attribute */
|
|
new_hdr = realloc(m->hdr, message_length);
|
|
if (!new_hdr)
|
|
return -ENOMEM;
|
|
m->hdr = new_hdr;
|
|
|
|
/* get pointer to the attribute we are about to add */
|
|
rta = (struct rtattr *) ((uint8_t *) m->hdr + m->hdr->nlmsg_len);
|
|
|
|
/* if we are inside containers, extend them */
|
|
for (i = 0; i < m->n_containers; i++)
|
|
GET_CONTAINER(m, i)->rta_len += message_length - m->hdr->nlmsg_len;
|
|
|
|
/* fill in the attribute */
|
|
rta->rta_type = type;
|
|
rta->rta_len = rta_length;
|
|
if (!data) {
|
|
/* this is the start of a new container */
|
|
m->container_offsets[m->n_containers ++] = m->hdr->nlmsg_len;
|
|
} else {
|
|
/* we don't deal with the case where the user lies about the type
|
|
* and gives us too little data (so don't do that)
|
|
*/
|
|
padding = mempcpy(RTA_DATA(rta), data, data_length);
|
|
/* make sure also the padding at the end of the message is initialized */
|
|
memzero(padding,
|
|
(uint8_t *) m->hdr + message_length - (uint8_t *) padding);
|
|
}
|
|
|
|
/* update message size */
|
|
m->hdr->nlmsg_len = message_length;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_rtnl_message_append_string(sd_rtnl_message *m, unsigned short type, const char *data) {
|
|
uint16_t rtm_type;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
assert_return(data, -EINVAL);
|
|
|
|
r = sd_rtnl_message_get_type(m, &rtm_type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* check that the type is correct */
|
|
switch (rtm_type) {
|
|
case RTM_NEWLINK:
|
|
case RTM_SETLINK:
|
|
case RTM_GETLINK:
|
|
case RTM_DELLINK:
|
|
if (m->n_containers == 1) {
|
|
if (GET_CONTAINER(m, 0)->rta_type != IFLA_LINKINFO ||
|
|
type != IFLA_INFO_KIND)
|
|
return -ENOTSUP;
|
|
} else {
|
|
switch (type) {
|
|
case IFLA_IFNAME:
|
|
case IFLA_IFALIAS:
|
|
case IFLA_QDISC:
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
}
|
|
break;
|
|
case RTM_NEWADDR:
|
|
case RTM_GETADDR:
|
|
case RTM_DELADDR:
|
|
if (type != IFA_LABEL)
|
|
return -ENOTSUP;
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
r = add_rtattr(m, type, data, strlen(data) + 1);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_rtnl_message_append_u8(sd_rtnl_message *m, unsigned short type, uint8_t data) {
|
|
uint16_t rtm_type;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
|
|
r = sd_rtnl_message_get_type(m, &rtm_type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
switch (rtm_type) {
|
|
case RTM_NEWLINK:
|
|
case RTM_SETLINK:
|
|
case RTM_GETLINK:
|
|
case RTM_DELLINK:
|
|
switch (type) {
|
|
case IFLA_CARRIER:
|
|
case IFLA_OPERSTATE:
|
|
case IFLA_LINKMODE:
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
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) {
|
|
uint16_t rtm_type;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
|
|
r = sd_rtnl_message_get_type(m, &rtm_type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* check that the type is correct */
|
|
switch (rtm_type) {
|
|
case RTM_NEWLINK:
|
|
case RTM_SETLINK:
|
|
case RTM_GETLINK:
|
|
case RTM_DELLINK:
|
|
if (m->n_containers == 2 &&
|
|
GET_CONTAINER(m, 0)->rta_type == IFLA_LINKINFO &&
|
|
GET_CONTAINER(m, 1)->rta_type == IFLA_INFO_DATA &&
|
|
type == IFLA_VLAN_ID)
|
|
break;
|
|
else
|
|
return -ENOTSUP;
|
|
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
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) {
|
|
uint16_t rtm_type;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
|
|
r = sd_rtnl_message_get_type(m, &rtm_type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* check that the type is correct */
|
|
switch (rtm_type) {
|
|
case RTM_NEWLINK:
|
|
case RTM_SETLINK:
|
|
case RTM_GETLINK:
|
|
case RTM_DELLINK:
|
|
switch (type) {
|
|
case IFLA_MASTER:
|
|
case IFLA_MTU:
|
|
case IFLA_LINK:
|
|
case IFLA_GROUP:
|
|
case IFLA_TXQLEN:
|
|
case IFLA_WEIGHT:
|
|
case IFLA_NET_NS_FD:
|
|
case IFLA_NET_NS_PID:
|
|
case IFLA_PROMISCUITY:
|
|
case IFLA_NUM_TX_QUEUES:
|
|
case IFLA_NUM_RX_QUEUES:
|
|
case IFLA_MACVLAN_MODE:
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
break;
|
|
case RTM_NEWROUTE:
|
|
case RTM_GETROUTE:
|
|
case RTM_DELROUTE:
|
|
switch (type) {
|
|
case RTA_TABLE:
|
|
case RTA_PRIORITY:
|
|
case RTA_IIF:
|
|
case RTA_OIF:
|
|
case RTA_MARK:
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
r = add_rtattr(m, type, &data, sizeof(uint32_t));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_rtnl_message_append_in_addr(sd_rtnl_message *m, unsigned short type, const struct in_addr *data) {
|
|
struct ifaddrmsg *ifa;
|
|
struct rtmsg *rtm;
|
|
uint16_t rtm_type;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
assert_return(data, -EINVAL);
|
|
|
|
r = sd_rtnl_message_get_type(m, &rtm_type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* check that the type is correct */
|
|
switch (rtm_type) {
|
|
case RTM_NEWADDR:
|
|
case RTM_GETADDR:
|
|
case RTM_DELADDR:
|
|
switch (type) {
|
|
case IFA_ADDRESS:
|
|
case IFA_LOCAL:
|
|
case IFA_BROADCAST:
|
|
case IFA_ANYCAST:
|
|
ifa = NLMSG_DATA(m->hdr);
|
|
|
|
if (ifa->ifa_family != AF_INET)
|
|
return -EINVAL;
|
|
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
break;
|
|
case RTM_NEWROUTE:
|
|
case RTM_GETROUTE:
|
|
case RTM_DELROUTE:
|
|
switch (type) {
|
|
case RTA_DST:
|
|
case RTA_SRC:
|
|
case RTA_GATEWAY:
|
|
rtm = NLMSG_DATA(m->hdr);
|
|
|
|
if (rtm->rtm_family != AF_INET)
|
|
return -EINVAL;
|
|
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
r = add_rtattr(m, type, data, sizeof(struct in_addr));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_rtnl_message_append_in6_addr(sd_rtnl_message *m, unsigned short type, const struct in6_addr *data) {
|
|
struct ifaddrmsg *ifa;
|
|
struct rtmsg *rtm;
|
|
uint16_t rtm_type;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
assert_return(data, -EINVAL);
|
|
|
|
r = sd_rtnl_message_get_type(m, &rtm_type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* check that the type is correct */
|
|
switch (rtm_type) {
|
|
case RTM_NEWADDR:
|
|
case RTM_GETADDR:
|
|
case RTM_DELADDR:
|
|
switch (type) {
|
|
case IFA_ADDRESS:
|
|
case IFA_LOCAL:
|
|
case IFA_BROADCAST:
|
|
case IFA_ANYCAST:
|
|
ifa = NLMSG_DATA(m->hdr);
|
|
|
|
if (ifa->ifa_family != AF_INET6)
|
|
return -EINVAL;
|
|
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
break;
|
|
case RTM_NEWROUTE:
|
|
case RTM_GETROUTE:
|
|
case RTM_DELROUTE:
|
|
switch (type) {
|
|
case RTA_DST:
|
|
case RTA_SRC:
|
|
case RTA_GATEWAY:
|
|
rtm = NLMSG_DATA(m->hdr);
|
|
|
|
if (rtm->rtm_family != AF_INET6)
|
|
return -EINVAL;
|
|
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
r = add_rtattr(m, type, data, sizeof(struct in6_addr));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_rtnl_message_append_ether_addr(sd_rtnl_message *m, unsigned short type, const struct ether_addr *data) {
|
|
uint16_t rtm_type;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
assert_return(data, -EINVAL);
|
|
|
|
sd_rtnl_message_get_type(m, &rtm_type);
|
|
|
|
switch (rtm_type) {
|
|
case RTM_NEWLINK:
|
|
case RTM_SETLINK:
|
|
case RTM_DELLINK:
|
|
case RTM_GETLINK:
|
|
switch (type) {
|
|
case IFLA_ADDRESS:
|
|
case IFLA_BROADCAST:
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
r = add_rtattr(m, type, data, ETH_ALEN);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_rtnl_message_open_container(sd_rtnl_message *m, unsigned short type) {
|
|
uint16_t rtm_type;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(!m->sealed, -EPERM);
|
|
|
|
sd_rtnl_message_get_type(m, &rtm_type);
|
|
|
|
if (rtnl_message_type_is_link(rtm_type)) {
|
|
|
|
if ((type == IFLA_LINKINFO && m->n_containers == 0) ||
|
|
(type == IFLA_INFO_DATA && m->n_containers == 1 &&
|
|
GET_CONTAINER(m, 0)->rta_type == IFLA_LINKINFO))
|
|
return add_rtattr(m, type, NULL, 0);
|
|
else if (type == VETH_INFO_PEER && m->n_containers == 2 &&
|
|
GET_CONTAINER(m, 1)->rta_type == IFLA_INFO_DATA &&
|
|
GET_CONTAINER(m, 0)->rta_type == IFLA_LINKINFO)
|
|
return add_rtattr(m, type, NULL, sizeof(struct ifinfomsg));
|
|
}
|
|
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
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->n_containers --;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sd_rtnl_message_read(sd_rtnl_message *m, unsigned short *type, void **data) {
|
|
size_t remaining_size;
|
|
uint16_t rtm_type;
|
|
int r;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(m->sealed, -EPERM);
|
|
assert_return(m->next_rta_offset, -EINVAL);
|
|
assert_return(type, -EINVAL);
|
|
assert_return(data, -EINVAL);
|
|
|
|
/* only read until the end of the current container */
|
|
if (m->n_containers)
|
|
remaining_size = GET_CONTAINER(m, m->n_containers - 1)->rta_len -
|
|
(m->next_rta_offset -
|
|
m->container_offsets[m->n_containers - 1]);
|
|
else
|
|
remaining_size = m->hdr->nlmsg_len - m->next_rta_offset;
|
|
|
|
if (!RTA_OK(NEXT_RTA(m), remaining_size))
|
|
return 0;
|
|
|
|
/* if we read a container, enter it and return its type */
|
|
r = sd_rtnl_message_get_type(m, &rtm_type);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
*type = NEXT_RTA(m)->rta_type;
|
|
|
|
if (rtnl_message_type_is_link(rtm_type) &&
|
|
((m->n_containers == 0 &&
|
|
NEXT_RTA(m)->rta_type == IFLA_LINKINFO) ||
|
|
(m->n_containers == 1 &&
|
|
GET_CONTAINER(m, 0)->rta_type == IFLA_LINKINFO &&
|
|
NEXT_RTA(m)->rta_type == IFLA_INFO_DATA))) {
|
|
*data = NULL;
|
|
PUSH_CONTAINER(m, NEXT_RTA(m));
|
|
UPDATE_RTA(m, RTA_DATA(NEXT_RTA(m)));
|
|
} else {
|
|
*data = RTA_DATA(NEXT_RTA(m));
|
|
UPDATE_RTA(m, RTA_NEXT(NEXT_RTA(m), remaining_size));
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
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);
|
|
|
|
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_get_errno(sd_rtnl_message *m) {
|
|
struct nlmsgerr *err;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(m->hdr, -EINVAL);
|
|
|
|
if (m->hdr->nlmsg_type != NLMSG_ERROR)
|
|
return 0;
|
|
|
|
err = NLMSG_DATA(m->hdr);
|
|
|
|
return err->error;
|
|
}
|
|
|
|
int rtnl_message_seal(sd_rtnl *nl, sd_rtnl_message *m) {
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(m->hdr);
|
|
|
|
if (m->sealed)
|
|
return -EPERM;
|
|
|
|
if (nl)
|
|
m->hdr->nlmsg_seq = nl->serial++;
|
|
|
|
m->sealed = true;
|
|
|
|
r = sd_rtnl_message_rewind(m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int message_receive_need(sd_rtnl *rtnl, size_t *need) {
|
|
assert(rtnl);
|
|
assert(need);
|
|
|
|
/* ioctl(rtnl->fd, FIONREAD, &need)
|
|
Does not appear to work on netlink sockets. libnl uses
|
|
MSG_PEEK instead. I don't know if that is worth the
|
|
extra roundtrip.
|
|
|
|
For now we simply use the maximum message size the kernel
|
|
may use (NLMSG_GOODSIZE), and then realloc to the actual
|
|
size after reading the message (hence avoiding huge memory
|
|
usage in case many small messages are kept around) */
|
|
*need = page_size();
|
|
if (*need > 8192UL)
|
|
*need = 8192UL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* returns the number of bytes sent, or a negative error code */
|
|
int socket_write_message(sd_rtnl *nl, sd_rtnl_message *m) {
|
|
union {
|
|
struct sockaddr sa;
|
|
struct sockaddr_nl nl;
|
|
} addr = {
|
|
.nl.nl_family = AF_NETLINK,
|
|
};
|
|
ssize_t k;
|
|
|
|
assert(nl);
|
|
assert(m);
|
|
assert(m->hdr);
|
|
|
|
k = sendto(nl->fd, m->hdr, m->hdr->nlmsg_len,
|
|
0, &addr.sa, sizeof(addr));
|
|
if (k < 0)
|
|
return (errno == EAGAIN) ? 0 : -errno;
|
|
|
|
return k;
|
|
}
|
|
|
|
/* On success, the number of bytes received is returned and *ret points to the received message
|
|
* which has a valid header and the correct size.
|
|
* If nothing useful was received 0 is returned.
|
|
* On failure, a negative error code is returned.
|
|
*/
|
|
int socket_read_message(sd_rtnl *nl, sd_rtnl_message **ret) {
|
|
sd_rtnl_message *m;
|
|
union {
|
|
struct sockaddr sa;
|
|
struct sockaddr_nl nl;
|
|
} addr;
|
|
socklen_t addr_len;
|
|
int r;
|
|
ssize_t k;
|
|
size_t need;
|
|
|
|
assert(nl);
|
|
assert(ret);
|
|
|
|
r = message_receive_need(nl, &need);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = message_new(nl, &m, need);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* don't allow sealing/appending to received messages */
|
|
m->sealed = true;
|
|
|
|
addr_len = sizeof(addr);
|
|
|
|
k = recvfrom(nl->fd, m->hdr, need,
|
|
0, &addr.sa, &addr_len);
|
|
if (k < 0)
|
|
k = (errno == EAGAIN) ? 0 : -errno; /* no data */
|
|
else if (k == 0)
|
|
k = -ECONNRESET; /* connection was closed by the kernel */
|
|
else if (addr_len != sizeof(addr.nl) ||
|
|
addr.nl.nl_family != AF_NETLINK)
|
|
k = -EIO; /* not a netlink message */
|
|
else if (addr.nl.nl_pid != 0)
|
|
k = 0; /* not from the kernel */
|
|
else if ((size_t) k < sizeof(struct nlmsghdr) ||
|
|
(size_t) k < m->hdr->nlmsg_len)
|
|
k = -EIO; /* too small (we do accept too big though) */
|
|
else if (m->hdr->nlmsg_pid && m->hdr->nlmsg_pid != nl->sockaddr.nl.nl_pid)
|
|
k = 0; /* not broadcast and not for us */
|
|
|
|
if (k > 0)
|
|
switch (m->hdr->nlmsg_type) {
|
|
/* check that the size matches the message type */
|
|
case NLMSG_ERROR:
|
|
if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
|
|
k = -EIO;
|
|
break;
|
|
case RTM_NEWLINK:
|
|
case RTM_SETLINK:
|
|
case RTM_DELLINK:
|
|
case RTM_GETLINK:
|
|
if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifinfomsg)))
|
|
k = -EIO;
|
|
else {
|
|
struct ifinfomsg *ifi;
|
|
|
|
ifi = NLMSG_DATA(m->hdr);
|
|
UPDATE_RTA(m, IFLA_RTA(ifi));
|
|
}
|
|
break;
|
|
case RTM_NEWADDR:
|
|
case RTM_DELADDR:
|
|
case RTM_GETADDR:
|
|
if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifaddrmsg)))
|
|
k = -EIO;
|
|
else {
|
|
struct ifaddrmsg *ifa;
|
|
|
|
ifa = NLMSG_DATA(m->hdr);
|
|
UPDATE_RTA(m, IFA_RTA(ifa));
|
|
}
|
|
break;
|
|
case RTM_NEWROUTE:
|
|
case RTM_DELROUTE:
|
|
case RTM_GETROUTE:
|
|
if (m->hdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtmsg)))
|
|
k = -EIO;
|
|
else {
|
|
struct rtmsg *rtm;
|
|
|
|
rtm = NLMSG_DATA(m->hdr);
|
|
UPDATE_RTA(m, RTM_RTA(rtm));
|
|
}
|
|
break;
|
|
case NLMSG_NOOP:
|
|
k = 0;
|
|
break;
|
|
default:
|
|
k = 0; /* ignoring message of unknown type */
|
|
}
|
|
|
|
if (k <= 0)
|
|
sd_rtnl_message_unref(m);
|
|
else {
|
|
/* we probably allocated way too much memory, give it back */
|
|
m->hdr = realloc(m->hdr, m->hdr->nlmsg_len);
|
|
*ret = m;
|
|
}
|
|
|
|
return k;
|
|
}
|
|
|
|
int sd_rtnl_message_rewind(sd_rtnl_message *m) {
|
|
struct ifinfomsg *ifi;
|
|
struct ifaddrmsg *ifa;
|
|
struct rtmsg *rtm;
|
|
|
|
assert_return(m, -EINVAL);
|
|
assert_return(m->sealed, -EPERM);
|
|
assert_return(m->hdr, -EINVAL);
|
|
|
|
switch(m->hdr->nlmsg_type) {
|
|
case RTM_NEWLINK:
|
|
case RTM_SETLINK:
|
|
case RTM_GETLINK:
|
|
case RTM_DELLINK:
|
|
ifi = NLMSG_DATA(m->hdr);
|
|
UPDATE_RTA(m, IFLA_RTA(ifi));
|
|
|
|
break;
|
|
case RTM_NEWADDR:
|
|
case RTM_GETADDR:
|
|
case RTM_DELADDR:
|
|
ifa = NLMSG_DATA(m->hdr);
|
|
UPDATE_RTA(m, IFA_RTA(ifa));
|
|
|
|
break;
|
|
case RTM_NEWROUTE:
|
|
case RTM_GETROUTE:
|
|
case RTM_DELROUTE:
|
|
rtm = NLMSG_DATA(m->hdr);
|
|
UPDATE_RTA(m, RTM_RTA(rtm));
|
|
|
|
break;
|
|
default:
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
m->n_containers = 0;
|
|
|
|
return 0;
|
|
}
|