+/* SPDX-License-Identifier: LGPL-2.1+ */
/***
- This file is part of systemd.
-
- Copyright (C) 2014 Axis Communications AB. All rights reserved.
- Copyright (C) 2015 Tom Gundersen
-
- 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/>.
+ Copyright © 2014 Axis Communications AB. All rights reserved.
***/
#include <arpa/inet.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
-#include <string.h>
+#include "sd-id128.h"
#include "sd-ipv4acd.h"
#include "sd-ipv4ll.h"
#include "alloc-util.h"
+#include "ether-addr-util.h"
#include "in-addr-util.h"
#include "list.h"
#include "random-util.h"
-#include "refcnt.h"
#include "siphash24.h"
#include "sparse-endian.h"
+#include "string-util.h"
#include "util.h"
-#define IPV4LL_NETWORK 0xA9FE0000L
-#define IPV4LL_NETMASK 0xFFFF0000L
+#define IPV4LL_NETWORK UINT32_C(0xA9FE0000)
+#define IPV4LL_NETMASK UINT32_C(0xFFFF0000)
#define IPV4LL_DONT_DESTROY(ll) \
_cleanup_(sd_ipv4ll_unrefp) _unused_ sd_ipv4ll *_dont_destroy_##ll = sd_ipv4ll_ref(ll)
unsigned n_ref;
sd_ipv4acd *acd;
+
be32_t address; /* the address pushed to ACD */
- struct random_data *random_data;
- char *random_data_state;
+ struct ether_addr mac;
+
+ struct {
+ le64_t value;
+ le64_t generation;
+ } seed;
+ bool seed_set;
/* External */
be32_t claimed_address;
+
sd_ipv4ll_callback_t callback;
void* userdata;
};
-sd_ipv4ll *sd_ipv4ll_ref(sd_ipv4ll *ll) {
- if (!ll)
- return NULL;
-
- assert(ll->n_ref >= 1);
- ll->n_ref++;
-
- return ll;
-}
-
-sd_ipv4ll *sd_ipv4ll_unref(sd_ipv4ll *ll) {
- if (!ll)
- return NULL;
+#define log_ipv4ll_errno(ll, error, fmt, ...) log_internal(LOG_DEBUG, error, PROJECT_FILE, __LINE__, __func__, "IPV4LL: " fmt, ##__VA_ARGS__)
+#define log_ipv4ll(ll, fmt, ...) log_ipv4ll_errno(ll, 0, fmt, ##__VA_ARGS__)
- assert(ll->n_ref >= 1);
- ll->n_ref--;
+static void ipv4ll_on_acd(sd_ipv4acd *ll, int event, void *userdata);
- if (ll->n_ref > 0)
- return NULL;
+static sd_ipv4ll *ipv4ll_free(sd_ipv4ll *ll) {
+ assert(ll);
sd_ipv4acd_unref(ll->acd);
-
- free(ll->random_data);
- free(ll->random_data_state);
- free(ll);
-
- return NULL;
+ return mfree(ll);
}
-static void ipv4ll_on_acd(sd_ipv4acd *ll, int event, void *userdata);
+DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_ipv4ll, sd_ipv4ll, ipv4ll_free);
int sd_ipv4ll_new(sd_ipv4ll **ret) {
_cleanup_(sd_ipv4ll_unrefp) sd_ipv4ll *ll = NULL;
if (r < 0)
return r;
- *ret = ll;
- ll = NULL;
+ *ret = TAKE_PTR(ll);
return 0;
}
int sd_ipv4ll_stop(sd_ipv4ll *ll) {
- int r;
-
assert_return(ll, -EINVAL);
- r = sd_ipv4acd_stop(ll->acd);
- if (r < 0)
- return r;
-
- return 0;
+ return sd_ipv4acd_stop(ll->acd);
}
int sd_ipv4ll_set_ifindex(sd_ipv4ll *ll, int ifindex) {
assert_return(ll, -EINVAL);
assert_return(ifindex > 0, -EINVAL);
+ assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY);
return sd_ipv4acd_set_ifindex(ll->acd, ifindex);
}
-#define HASH_KEY SD_ID128_MAKE(df,04,22,98,3f,ad,14,52,f9,87,2e,d1,9c,70,e2,f2)
-
int sd_ipv4ll_set_mac(sd_ipv4ll *ll, const struct ether_addr *addr) {
int r;
assert_return(ll, -EINVAL);
+ assert_return(addr, -EINVAL);
+ assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY);
- if (!ll->random_data) {
- uint64_t seed;
-
- /* If no random data is set, generate some from the MAC */
- seed = siphash24(&addr->ether_addr_octet, ETH_ALEN, HASH_KEY.bytes);
-
- assert_cc(sizeof(unsigned) <= 8);
-
- r = sd_ipv4ll_set_address_seed(ll, (unsigned) htole64(seed));
- if (r < 0)
- return r;
- }
+ r = sd_ipv4acd_set_mac(ll->acd, addr);
+ if (r < 0)
+ return r;
- return sd_ipv4acd_set_mac(ll->acd, addr);
+ ll->mac = *addr;
+ return 0;
}
int sd_ipv4ll_detach_event(sd_ipv4ll *ll) {
}
int sd_ipv4ll_attach_event(sd_ipv4ll *ll, sd_event *event, int64_t priority) {
- int r;
-
assert_return(ll, -EINVAL);
- r = sd_ipv4acd_attach_event(ll->acd, event, priority);
- if (r < 0)
- return r;
-
- return 0;
+ return sd_ipv4acd_attach_event(ll->acd, event, priority);
}
int sd_ipv4ll_set_callback(sd_ipv4ll *ll, sd_ipv4ll_callback_t cb, void *userdata) {
return 0;
}
-int sd_ipv4ll_set_address_seed(sd_ipv4ll *ll, unsigned seed) {
- _cleanup_free_ struct random_data *random_data = NULL;
- _cleanup_free_ char *random_data_state = NULL;
- int r;
-
+int sd_ipv4ll_set_address_seed(sd_ipv4ll *ll, uint64_t seed) {
assert_return(ll, -EINVAL);
+ assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY);
- random_data = new0(struct random_data, 1);
- if (!random_data)
- return -ENOMEM;
-
- random_data_state = new0(char, 128);
- if (!random_data_state)
- return -ENOMEM;
-
- r = initstate_r(seed, random_data_state, 128, random_data);
- if (r < 0)
- return r;
-
- free(ll->random_data);
- ll->random_data = random_data;
- random_data = NULL;
-
- free(ll->random_data_state);
- ll->random_data_state = random_data_state;
- random_data_state = NULL;
+ ll->seed.value = htole64(seed);
+ ll->seed_set = true;
return 0;
}
}
static bool ipv4ll_address_is_valid(const struct in_addr *address) {
- uint32_t addr;
-
assert(address);
if (!in_addr_is_link_local(AF_INET, (const union in_addr_union *) address))
return false;
- addr = be32toh(address->s_addr);
-
- if ((addr & 0x0000FF00) == 0x0000 ||
- (addr & 0x0000FF00) == 0xFF00)
- return false;
-
- return true;
+ return !IN_SET(be32toh(address->s_addr) & 0x0000FF00U, 0x0000U, 0xFF00U);
}
int sd_ipv4ll_set_address(sd_ipv4ll *ll, const struct in_addr *address) {
return 0;
}
+#define PICK_HASH_KEY SD_ID128_MAKE(15,ac,82,a6,d6,3f,49,78,98,77,5d,0c,69,02,94,0b)
+
static int ipv4ll_pick_address(sd_ipv4ll *ll) {
- struct in_addr in_addr;
+ _cleanup_free_ char *address = NULL;
be32_t addr;
- int r;
- int32_t random;
assert(ll);
- assert(ll->random_data);
do {
- r = random_r(ll->random_data, &random);
- if (r < 0)
- return r;
- addr = htonl((random & 0x0000FFFF) | IPV4LL_NETWORK);
- } while (addr == ll->address ||
- (ntohl(addr) & 0x0000FF00) == 0x0000 ||
- (ntohl(addr) & 0x0000FF00) == 0xFF00);
+ uint64_t h;
- in_addr.s_addr = addr;
+ h = siphash24(&ll->seed, sizeof(ll->seed), PICK_HASH_KEY.bytes);
- r = sd_ipv4ll_set_address(ll, &in_addr);
- if (r < 0)
- return r;
+ /* Increase the generation counter by one */
+ ll->seed.generation = htole64(le64toh(ll->seed.generation) + 1);
- return 0;
+ addr = htobe32((h & UINT32_C(0x0000FFFF)) | IPV4LL_NETWORK);
+ } while (addr == ll->address ||
+ IN_SET(be32toh(addr) & 0x0000FF00U, 0x0000U, 0xFF00U));
+
+ (void) in_addr_to_string(AF_INET, &(union in_addr_union) { .in.s_addr = addr }, &address);
+ log_ipv4ll(ll, "Picked new IP address %s.", strna(address));
+
+ return sd_ipv4ll_set_address(ll, &(struct in_addr) { addr });
}
-int sd_ipv4ll_start(sd_ipv4ll *ll) {
+#define MAC_HASH_KEY SD_ID128_MAKE(df,04,22,98,3f,ad,14,52,f9,87,2e,d1,9c,70,e2,f2)
+
+static int ipv4ll_start_internal(sd_ipv4ll *ll, bool reset_generation) {
int r;
+ bool picked_address = false;
assert_return(ll, -EINVAL);
- assert_return(ll->random_data, -EINVAL);
+ assert_return(!ether_addr_is_null(&ll->mac), -EINVAL);
+
+ /* If no random seed is set, generate some from the MAC address */
+ if (!ll->seed_set)
+ ll->seed.value = htole64(siphash24(ll->mac.ether_addr_octet, ETH_ALEN, MAC_HASH_KEY.bytes));
+
+ if (reset_generation)
+ ll->seed.generation = 0;
if (ll->address == 0) {
r = ipv4ll_pick_address(ll);
if (r < 0)
return r;
+
+ picked_address = true;
}
- r = sd_ipv4acd_start(ll->acd);
- if (r < 0)
+ r = sd_ipv4acd_start(ll->acd, reset_generation);
+ if (r < 0) {
+
+ /* We couldn't start? If so, let's forget the picked address again, the user might make a change and
+ * retry, and we want the new data to take effect when picking an address. */
+ if (picked_address)
+ ll->address = 0;
+
return r;
+ }
- return 0;
+ return 1;
+}
+
+int sd_ipv4ll_start(sd_ipv4ll *ll) {
+ assert_return(ll, -EINVAL);
+
+ if (sd_ipv4ll_is_running(ll))
+ return 0;
+
+ return ipv4ll_start_internal(ll, true);
+}
+
+int sd_ipv4ll_restart(sd_ipv4ll *ll) {
+ ll->address = 0;
+
+ return ipv4ll_start_internal(ll, false);
}
static void ipv4ll_client_notify(sd_ipv4ll *ll, int event) {
assert(ll);
switch (event) {
+
case SD_IPV4ACD_EVENT_STOP:
ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_STOP);
-
ll->claimed_address = 0;
-
break;
+
case SD_IPV4ACD_EVENT_BIND:
ll->claimed_address = ll->address;
ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_BIND);
-
break;
+
case SD_IPV4ACD_EVENT_CONFLICT:
/* if an address was already bound we must call up to the
user to handle this, otherwise we just try again */
ll->claimed_address = 0;
} else {
- r = ipv4ll_pick_address(ll);
- if (r < 0)
- goto error;
-
- r = sd_ipv4acd_start(ll->acd);
+ r = sd_ipv4ll_restart(ll);
if (r < 0)
goto error;
}
break;
+
default:
assert_not_reached("Invalid IPv4ACD event.");
}
projects / thirdparty / systemd.git / blobdiff