networkd-address.c revision 12ca818ffddb77eb6a0fabe369a5bcbf6994ff8b
/*-*- 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 <net/if.h>
#include "utf8.h"
#include "util.h"
#include "conf-parser.h"
#include "firewall-util.h"
#include "netlink-util.h"
#include "networkd.h"
#include "networkd-address.h"
static void address_init(Address *address) {
assert(address);
address->family = AF_UNSPEC;
address->scope = RT_SCOPE_UNIVERSE;
address->cinfo.ifa_prefered = CACHE_INFO_INFINITY_LIFE_TIME;
address->cinfo.ifa_valid = CACHE_INFO_INFINITY_LIFE_TIME;
}
int address_new_static(Network *network, unsigned section, Address **ret) {
_cleanup_address_free_ Address *address = NULL;
if (section) {
address = hashmap_get(network->addresses_by_section, UINT_TO_PTR(section));
if (address) {
*ret = address;
address = NULL;
return 0;
}
}
address = new0(Address, 1);
if (!address)
return -ENOMEM;
address_init(address);
address->network = network;
LIST_APPEND(addresses, network->static_addresses, address);
if (section) {
address->section = section;
hashmap_put(network->addresses_by_section,
UINT_TO_PTR(address->section), address);
}
*ret = address;
address = NULL;
return 0;
}
int address_new_dynamic(Address **ret) {
_cleanup_address_free_ Address *address = NULL;
address = new0(Address, 1);
if (!address)
return -ENOMEM;
address_init(address);
*ret = address;
address = NULL;
return 0;
}
void address_free(Address *address) {
if (!address)
return;
if (address->network) {
LIST_REMOVE(addresses, address->network->static_addresses, address);
if (address->section)
hashmap_remove(address->network->addresses_by_section,
UINT_TO_PTR(address->section));
}
free(address);
}
int address_establish(Address *address, Link *link) {
bool masq;
int r;
assert(address);
assert(link);
masq = link->network &&
link->network->ip_masquerade &&
address->family == AF_INET &&
address->scope < RT_SCOPE_LINK;
/* Add firewall entry if this is requested */
if (address->ip_masquerade_done != masq) {
union in_addr_union masked = address->in_addr;
in_addr_mask(address->family, &masked, address->prefixlen);
r = fw_add_masquerade(masq, AF_INET, 0, &masked, address->prefixlen, NULL, NULL, 0);
if (r < 0)
log_link_warning_errno(link, r, "Could not enable IP masquerading: %m");
address->ip_masquerade_done = masq;
}
return 0;
}
int address_release(Address *address, Link *link) {
int r;
assert(address);
assert(link);
/* Remove masquerading firewall entry if it was added */
if (address->ip_masquerade_done) {
union in_addr_union masked = address->in_addr;
in_addr_mask(address->family, &masked, address->prefixlen);
r = fw_add_masquerade(false, AF_INET, 0, &masked, address->prefixlen, NULL, NULL, 0);
if (r < 0)
log_link_warning_errno(link, r, "Failed to disable IP masquerading: %m");
address->ip_masquerade_done = false;
}
return 0;
}
int address_drop(Address *address, Link *link,
sd_netlink_message_handler_t callback) {
_cleanup_netlink_message_unref_ sd_netlink_message *req = NULL;
int r;
assert(address);
assert(address->family == AF_INET || address->family == AF_INET6);
assert(link);
assert(link->ifindex > 0);
assert(link->manager);
assert(link->manager->rtnl);
address_release(address, link);
r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_DELADDR,
link->ifindex, address->family);
if (r < 0)
return log_error_errno(r, "Could not allocate RTM_DELADDR message: %m");
r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
if (r < 0)
return log_error_errno(r, "Could not set prefixlen: %m");
if (address->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, IFA_LOCAL, &address->in_addr.in);
else if (address->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
if (r < 0)
return log_error_errno(r, "Could not append IFA_LOCAL attribute: %m");
r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
if (r < 0)
return log_error_errno(r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
int address_update(Address *address, Link *link,
sd_netlink_message_handler_t callback) {
_cleanup_netlink_message_unref_ sd_netlink_message *req = NULL;
int r;
assert(address);
assert(address->family == AF_INET || address->family == AF_INET6);
assert(link->ifindex > 0);
assert(link->manager);
assert(link->manager->rtnl);
r = sd_rtnl_message_new_addr_update(link->manager->rtnl, &req,
link->ifindex, address->family);
if (r < 0)
return log_error_errno(r, "Could not allocate RTM_NEWADDR message: %m");
r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
if (r < 0)
return log_error_errno(r, "Could not set prefixlen: %m");
address->flags |= IFA_F_PERMANENT;
r = sd_rtnl_message_addr_set_flags(req, address->flags & 0xff);
if (r < 0)
return log_error_errno(r, "Could not set flags: %m");
if (address->flags & ~0xff && link->rtnl_extended_attrs) {
r = sd_netlink_message_append_u32(req, IFA_FLAGS, address->flags);
if (r < 0)
return log_error_errno(r, "Could not set extended flags: %m");
}
r = sd_rtnl_message_addr_set_scope(req, address->scope);
if (r < 0)
return log_error_errno(r, "Could not set scope: %m");
if (address->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, IFA_LOCAL, &address->in_addr.in);
else if (address->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
if (r < 0)
return log_error_errno(r, "Could not append IFA_LOCAL attribute: %m");
if (address->family == AF_INET) {
r = sd_netlink_message_append_in_addr(req, IFA_BROADCAST, &address->broadcast);
if (r < 0)
return log_error_errno(r, "Could not append IFA_BROADCAST attribute: %m");
}
if (address->label) {
r = sd_netlink_message_append_string(req, IFA_LABEL, address->label);
if (r < 0)
return log_error_errno(r, "Could not append IFA_LABEL attribute: %m");
}
r = sd_netlink_message_append_cache_info(req, IFA_CACHEINFO, &address->cinfo);
if (r < 0)
return log_error_errno(r, "Could not append IFA_CACHEINFO attribute: %m");
r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
if (r < 0)
return log_error_errno(r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
static int address_acquire(Link *link, Address *original, Address **ret) {
union in_addr_union in_addr = {};
struct in_addr broadcast = {};
_cleanup_address_free_ Address *na = NULL;
int r;
assert(link);
assert(original);
assert(ret);
/* Something useful was configured? just use it */
if (in_addr_is_null(original->family, &original->in_addr) <= 0)
return 0;
/* The address is configured to be 0.0.0.0 or [::] by the user?
* Then let's acquire something more useful from the pool. */
r = manager_address_pool_acquire(link->manager, original->family, original->prefixlen, &in_addr);
if (r < 0)
return log_link_error_errno(link, r, "Failed to acquire address from pool: %m");
if (r == 0) {
log_link_error(link, "Couldn't find free address for interface, all taken.");
return -EBUSY;
}
if (original->family == AF_INET) {
/* Pick first address in range for ourselves ... */
in_addr.in.s_addr = in_addr.in.s_addr | htobe32(1);
/* .. and use last as broadcast address */
broadcast.s_addr = in_addr.in.s_addr | htobe32(0xFFFFFFFFUL >> original->prefixlen);
} else if (original->family == AF_INET6)
in_addr.in6.s6_addr[15] |= 1;
r = address_new_dynamic(&na);
if (r < 0)
return r;
na->family = original->family;
na->prefixlen = original->prefixlen;
na->scope = original->scope;
na->cinfo = original->cinfo;
if (original->label) {
na->label = strdup(original->label);
if (!na->label)
return -ENOMEM;
}
na->broadcast = broadcast;
na->in_addr = in_addr;
LIST_PREPEND(addresses, link->pool_addresses, na);
*ret = na;
na = NULL;
return 0;
}
int address_configure(Address *address, Link *link,
sd_netlink_message_handler_t callback) {
_cleanup_netlink_message_unref_ sd_netlink_message *req = NULL;
int r;
assert(address);
assert(address->family == AF_INET || address->family == AF_INET6);
assert(link);
assert(link->ifindex > 0);
assert(link->manager);
assert(link->manager->rtnl);
r = address_acquire(link, address, &address);
if (r < 0)
return r;
r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_NEWADDR,
link->ifindex, address->family);
if (r < 0)
return log_error_errno(r, "Could not allocate RTM_NEWADDR message: %m");
r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
if (r < 0)
return log_error_errno(r, "Could not set prefixlen: %m");
address->flags |= IFA_F_PERMANENT;
r = sd_rtnl_message_addr_set_flags(req, (address->flags & 0xff));
if (r < 0)
return log_error_errno(r, "Could not set flags: %m");
if (address->flags & ~0xff) {
r = sd_netlink_message_append_u32(req, IFA_FLAGS, address->flags);
if (r < 0)
return log_error_errno(r, "Could not set extended flags: %m");
}
r = sd_rtnl_message_addr_set_scope(req, address->scope);
if (r < 0)
return log_error_errno(r, "Could not set scope: %m");
if (address->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, IFA_LOCAL, &address->in_addr.in);
else if (address->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
if (r < 0)
return log_error_errno(r, "Could not append IFA_LOCAL attribute: %m");
if (!in_addr_is_null(address->family, &address->in_addr_peer)) {
if (address->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, IFA_ADDRESS, &address->in_addr_peer.in);
else if (address->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, IFA_ADDRESS, &address->in_addr_peer.in6);
if (r < 0)
return log_error_errno(r, "Could not append IFA_ADDRESS attribute: %m");
} else {
if (address->family == AF_INET) {
r = sd_netlink_message_append_in_addr(req, IFA_BROADCAST, &address->broadcast);
if (r < 0)
return log_error_errno(r, "Could not append IFA_BROADCAST attribute: %m");
}
}
if (address->label) {
r = sd_netlink_message_append_string(req, IFA_LABEL, address->label);
if (r < 0)
return log_error_errno(r, "Could not append IFA_LABEL attribute: %m");
}
r = sd_netlink_message_append_cache_info(req, IFA_CACHEINFO,
&address->cinfo);
if (r < 0)
return log_error_errno(r, "Could not append IFA_CACHEINFO attribute: %m");
r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
if (r < 0)
return log_error_errno(r, "Could not send rtnetlink message: %m");
link_ref(link);
address_establish(address, link);
return 0;
}
int config_parse_broadcast(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
_cleanup_address_free_ Address *n = NULL;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = address_new_static(network, section_line, &n);
if (r < 0)
return r;
if (n->family == AF_INET6) {
log_syntax(unit, LOG_ERR, filename, line, 0, "Broadcast is not valid for IPv6 addresses, ignoring assignment: %s", rvalue);
return 0;
}
r = in_addr_from_string(AF_INET, rvalue, (union in_addr_union*) &n->broadcast);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r, "Broadcast is invalid, ignoring assignment: %s", rvalue);
return 0;
}
n->family = AF_INET;
n = NULL;
return 0;
}
int config_parse_address(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
_cleanup_address_free_ Address *n = NULL;
const char *address, *e;
union in_addr_union buffer;
int r, f;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
if (streq(section, "Network")) {
/* we are not in an Address section, so treat
* this as the special '0' section */
section_line = 0;
}
r = address_new_static(network, section_line, &n);
if (r < 0)
return r;
/* Address=address/prefixlen */
/* prefixlen */
e = strchr(rvalue, '/');
if (e) {
unsigned i;
r = safe_atou(e + 1, &i);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r, "Prefix length is invalid, ignoring assignment: %s", e + 1);
return 0;
}
n->prefixlen = (unsigned char) i;
address = strndupa(rvalue, e - rvalue);
} else
address = rvalue;
r = in_addr_from_string_auto(address, &f, &buffer);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r, "Address is invalid, ignoring assignment: %s", address);
return 0;
}
if (!e && f == AF_INET) {
r = in_addr_default_prefixlen(&buffer.in, &n->prefixlen);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r, "Prefix length not specified, and a default one can not be deduced for '%s', ignoring assignment", address);
return 0;
}
}
if (n->family != AF_UNSPEC && f != n->family) {
log_syntax(unit, LOG_ERR, filename, line, 0, "Address is incompatible, ignoring assignment: %s", address);
return 0;
}
n->family = f;
if (streq(lvalue, "Address"))
n->in_addr = buffer;
else
n->in_addr_peer = buffer;
if (n->family == AF_INET && n->broadcast.s_addr == 0)
n->broadcast.s_addr = n->in_addr.in.s_addr | htonl(0xfffffffflu >> n->prefixlen);
n = NULL;
return 0;
}
int config_parse_label(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
_cleanup_address_free_ Address *n = NULL;
char *label;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = address_new_static(network, section_line, &n);
if (r < 0)
return r;
label = strdup(rvalue);
if (!label)
return log_oom();
if (!ascii_is_valid(label) || strlen(label) >= IFNAMSIZ) {
log_syntax(unit, LOG_ERR, filename, line, 0, "Interface label is not ASCII clean or is too long, ignoring assignment: %s", rvalue);
free(label);
return 0;
}
free(n->label);
if (*label)
n->label = label;
else {
free(label);
n->label = NULL;
}
n = NULL;
return 0;
}
bool address_equal(Address *a1, Address *a2) {
/* same object */
if (a1 == a2)
return true;
/* one, but not both, is NULL */
if (!a1 || !a2)
return false;
if (a1->family != a2->family)
return false;
switch (a1->family) {
/* use the same notion of equality as the kernel does */
case AF_UNSPEC:
return true;
case AF_INET:
if (a1->prefixlen != a2->prefixlen)
return false;
else if (a1->prefixlen == 0)
/* make sure we don't try to shift by 32.
* See ISO/IEC 9899:TC3 ยง 6.5.7.3. */
return true;
else {
uint32_t b1, b2;
b1 = be32toh(a1->in_addr.in.s_addr);
b2 = be32toh(a2->in_addr.in.s_addr);
return (b1 >> (32 - a1->prefixlen)) == (b2 >> (32 - a1->prefixlen));
}
case AF_INET6: {
uint64_t *b1, *b2;
b1 = (uint64_t*)&a1->in_addr.in6;
b2 = (uint64_t*)&a2->in_addr.in6;
return (((b1[0] ^ b2[0]) | (b1[1] ^ b2[1])) == 0UL);
}
default:
assert_not_reached("Invalid address family");
}
}