network-internal.c revision 505f8da7325591defe5f751f328bd26915267602
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 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/ether.h>
#include <linux/if.h>
#include <arpa/inet.h>
#include <fnmatch.h>
#include "strv.h"
#include "siphash24.h"
#include "libudev-private.h"
#include "network-internal.h"
#include "log.h"
#include "utf8.h"
#include "util.h"
#include "conf-parser.h"
#include "condition.h"
#define HASH_KEY SD_ID128_MAKE(d3,1e,48,fa,90,fe,4b,4c,9d,af,d5,d7,a1,b1,2e,8a)
int net_get_unique_predictable_data(struct udev_device *device, uint8_t result[8]) {
size_t l, sz = 0;
const char *name = NULL, *field = NULL;
int r;
uint8_t *v;
/* fetch some persistent data unique (on this machine) to this device */
FOREACH_STRING(field, "ID_NET_NAME_ONBOARD", "ID_NET_NAME_SLOT", "ID_NET_NAME_PATH", "ID_NET_NAME_MAC") {
name = udev_device_get_property_value(device, field);
if (name)
break;
}
if (!name)
return -ENOENT;
l = strlen(name);
sz = sizeof(sd_id128_t) + l;
v = alloca(sz);
/* fetch some persistent data unique to this machine */
r = sd_id128_get_machine((sd_id128_t*) v);
if (r < 0)
return r;
memcpy(v + sizeof(sd_id128_t), name, l);
/* Let's hash the machine ID plus the device name. We
* use a fixed, but originally randomly created hash
* key here. */
siphash24(result, v, sz, HASH_KEY.bytes);
return 0;
}
bool net_match_config(const struct ether_addr *match_mac,
const char *match_path,
const char *match_driver,
const char *match_type,
const char *match_name,
Condition *match_host,
Condition *match_virt,
Condition *match_kernel,
Condition *match_arch,
const struct ether_addr *dev_mac,
const char *dev_path,
const char *dev_parent_driver,
const char *dev_driver,
const char *dev_type,
const char *dev_name) {
if (match_host && !condition_test_host(match_host))
return 0;
if (match_virt && !condition_test_virtualization(match_virt))
return 0;
if (match_kernel && !condition_test_kernel_command_line(match_kernel))
return 0;
if (match_arch && !condition_test_architecture(match_arch))
return 0;
if (match_mac && (!dev_mac || memcmp(match_mac, dev_mac, ETH_ALEN)))
return 0;
if (match_path && (!dev_path || fnmatch(match_path, dev_path, 0)))
return 0;
if (match_driver) {
if (dev_parent_driver && !streq(match_driver, dev_parent_driver))
return 0;
else if (!streq_ptr(match_driver, dev_driver))
return 0;
}
if (match_type && !streq_ptr(match_type, dev_type))
return 0;
if (match_name && (!dev_name || fnmatch(match_name, dev_name, 0)))
return 0;
return 1;
}
unsigned net_netmask_to_prefixlen(const struct in_addr *addr) {
assert(addr);
return 32 - u32ctz(be32toh(addr->s_addr));
}
int config_parse_net_condition(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) {
ConditionType cond = ltype;
Condition **ret = data;
bool negate;
Condition *c;
_cleanup_free_ char *s = NULL;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
negate = rvalue[0] == '!';
if (negate)
rvalue++;
s = strdup(rvalue);
if (!s)
return log_oom();
c = condition_new(cond, s, false, negate);
if (!c)
return log_oom();
if (*ret)
condition_free(*ret);
*ret = c;
return 0;
}
int config_parse_ifname(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) {
char **s = data;
char *n;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
n = strdup(rvalue);
if (!n)
return log_oom();
if (!ascii_is_valid(n) || strlen(n) >= IFNAMSIZ) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"Interface name is not ASCII clean or is too long, ignoring assignment: %s", rvalue);
free(n);
return 0;
}
free(*s);
if (*n)
*s = n;
else {
free(n);
*s = NULL;
}
return 0;
}
int config_parse_ifalias(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) {
char **s = data;
char *n;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
n = strdup(rvalue);
if (!n)
return log_oom();
if (!ascii_is_valid(n) || strlen(n) >= IFALIASZ) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"Interface alias is not ASCII clean or is too long, ignoring assignment: %s", rvalue);
free(n);
return 0;
}
free(*s);
if (*n)
*s = n;
else {
free(n);
*s = NULL;
}
return 0;
}
int config_parse_hwaddr(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) {
struct ether_addr **hwaddr = data;
struct ether_addr *n;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
n = new0(struct ether_addr, 1);
if (!n)
return log_oom();
r = sscanf(rvalue, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
&n->ether_addr_octet[0],
&n->ether_addr_octet[1],
&n->ether_addr_octet[2],
&n->ether_addr_octet[3],
&n->ether_addr_octet[4],
&n->ether_addr_octet[5]);
if (r != 6) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"Not a valid MAC address, ignoring assignment: %s", rvalue);
free(n);
return 0;
}
free(*hwaddr);
*hwaddr = n;
return 0;
}
int net_parse_inaddr(const char *address, unsigned char *family, void *dst) {
int r;
assert(address);
assert(family);
assert(dst);
/* IPv4 */
r = inet_pton(AF_INET, address, dst);
if (r > 0) {
/* succsefully parsed IPv4 address */
if (*family == AF_UNSPEC)
*family = AF_INET;
else if (*family != AF_INET)
return -EINVAL;
} else if (r < 0)
return -errno;
else {
/* not an IPv4 address, so let's try IPv6 */
r = inet_pton(AF_INET6, address, dst);
if (r > 0) {
/* successfully parsed IPv6 address */
if (*family == AF_UNSPEC)
*family = AF_INET6;
else if (*family != AF_INET6)
return -EINVAL;
} else if (r < 0)
return -errno;
else
return -EINVAL;
}
return 0;
}