summaryrefslogtreecommitdiff
path: root/src/libsystemd-network/sd-ipv4ll.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libsystemd-network/sd-ipv4ll.c')
-rw-r--r--src/libsystemd-network/sd-ipv4ll.c364
1 files changed, 364 insertions, 0 deletions
diff --git a/src/libsystemd-network/sd-ipv4ll.c b/src/libsystemd-network/sd-ipv4ll.c
new file mode 100644
index 0000000000..7725b67548
--- /dev/null
+++ b/src/libsystemd-network/sd-ipv4ll.c
@@ -0,0 +1,364 @@
+/***
+ 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/>.
+***/
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <systemd/sd-ipv4acd.h>
+#include <systemd/sd-ipv4ll.h>
+
+#include "alloc-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 "util.h"
+
+#define IPV4LL_NETWORK 0xA9FE0000L
+#define IPV4LL_NETMASK 0xFFFF0000L
+
+#define IPV4LL_DONT_DESTROY(ll) \
+ _cleanup_(sd_ipv4ll_unrefp) _unused_ sd_ipv4ll *_dont_destroy_##ll = sd_ipv4ll_ref(ll)
+
+struct sd_ipv4ll {
+ unsigned n_ref;
+
+ sd_ipv4acd *acd;
+ be32_t address; /* the address pushed to ACD */
+ struct random_data *random_data;
+ char *random_data_state;
+
+ /* External */
+ be32_t claimed_address;
+ sd_ipv4ll_cb_t cb;
+ 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;
+
+ assert(ll->n_ref >= 1);
+ ll->n_ref--;
+
+ if (ll->n_ref > 0)
+ return NULL;
+
+ sd_ipv4acd_unref(ll->acd);
+
+ free(ll->random_data);
+ free(ll->random_data_state);
+ free(ll);
+
+ return NULL;
+}
+
+static void ipv4ll_on_acd(sd_ipv4acd *ll, int event, void *userdata);
+
+int sd_ipv4ll_new(sd_ipv4ll **ret) {
+ _cleanup_(sd_ipv4ll_unrefp) sd_ipv4ll *ll = NULL;
+ int r;
+
+ assert_return(ret, -EINVAL);
+
+ ll = new0(sd_ipv4ll, 1);
+ if (!ll)
+ return -ENOMEM;
+
+ ll->n_ref = 1;
+
+ r = sd_ipv4acd_new(&ll->acd);
+ if (r < 0)
+ return r;
+
+ r = sd_ipv4acd_set_callback(ll->acd, ipv4ll_on_acd, ll);
+ if (r < 0)
+ return r;
+
+ *ret = ll;
+ ll = NULL;
+
+ 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;
+}
+
+int sd_ipv4ll_set_index(sd_ipv4ll *ll, int interface_index) {
+ assert_return(ll, -EINVAL);
+
+ return sd_ipv4acd_set_index(ll->acd, interface_index);
+}
+
+#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);
+
+ 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;
+ }
+
+ return sd_ipv4acd_set_mac(ll->acd, addr);
+}
+
+int sd_ipv4ll_detach_event(sd_ipv4ll *ll) {
+ assert_return(ll, -EINVAL);
+
+ return sd_ipv4acd_detach_event(ll->acd);
+}
+
+int sd_ipv4ll_attach_event(sd_ipv4ll *ll, sd_event *event, int priority) {
+ int r;
+
+ assert_return(ll, -EINVAL);
+
+ r = sd_ipv4acd_attach_event(ll->acd, event, priority);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int sd_ipv4ll_set_callback(sd_ipv4ll *ll, sd_ipv4ll_cb_t cb, void *userdata) {
+ assert_return(ll, -EINVAL);
+
+ ll->cb = cb;
+ ll->userdata = userdata;
+
+ return 0;
+}
+
+int sd_ipv4ll_get_address(sd_ipv4ll *ll, struct in_addr *address){
+ assert_return(ll, -EINVAL);
+ assert_return(address, -EINVAL);
+
+ if (ll->claimed_address == 0)
+ return -ENOENT;
+
+ address->s_addr = ll->claimed_address;
+
+ 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;
+
+ assert_return(ll, -EINVAL);
+
+ 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;
+
+ return 0;
+}
+
+int sd_ipv4ll_is_running(sd_ipv4ll *ll) {
+ assert_return(ll, false);
+
+ return sd_ipv4acd_is_running(ll->acd);
+}
+
+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;
+}
+
+int sd_ipv4ll_set_address(sd_ipv4ll *ll, const struct in_addr *address) {
+ int r;
+
+ assert_return(ll, -EINVAL);
+ assert_return(address, -EINVAL);
+ assert_return(ipv4ll_address_is_valid(address), -EINVAL);
+
+ r = sd_ipv4acd_set_address(ll->acd, address);
+ if (r < 0)
+ return r;
+
+ ll->address = address->s_addr;
+
+ return 0;
+}
+
+static int ipv4ll_pick_address(sd_ipv4ll *ll) {
+ struct in_addr in_addr;
+ 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);
+
+ in_addr.s_addr = addr;
+
+ r = sd_ipv4ll_set_address(ll, &in_addr);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int sd_ipv4ll_start(sd_ipv4ll *ll) {
+ int r;
+
+ assert_return(ll, -EINVAL);
+ assert_return(ll->random_data, -EINVAL);
+
+ if (ll->address == 0) {
+ r = ipv4ll_pick_address(ll);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_ipv4acd_start(ll->acd);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static void ipv4ll_client_notify(sd_ipv4ll *ll, int event) {
+ assert(ll);
+
+ if (ll->cb)
+ ll->cb(ll, event, ll->userdata);
+}
+
+void ipv4ll_on_acd(sd_ipv4acd *acd, int event, void *userdata) {
+ sd_ipv4ll *ll = userdata;
+ IPV4LL_DONT_DESTROY(ll);
+ int r;
+
+ assert(acd);
+ 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 */
+ if (ll->claimed_address != 0) {
+ ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_CONFLICT);
+
+ ll->claimed_address = 0;
+ } else {
+ r = ipv4ll_pick_address(ll);
+ if (r < 0)
+ goto error;
+
+ r = sd_ipv4acd_start(ll->acd);
+ if (r < 0)
+ goto error;
+ }
+
+ break;
+ default:
+ assert_not_reached("Invalid IPv4ACD event.");
+ }
+
+ return;
+
+error:
+ ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_STOP);
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2025-04-30 20:26:55 +0000