365 lines
8.9 KiB
C
365 lines
8.9 KiB
C
/***
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This file is part of systemd.
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Copyright (C) 2014 Axis Communications AB. All rights reserved.
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Copyright (C) 2015 Tom Gundersen
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <arpa/inet.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "sd-ipv4acd.h"
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#include "sd-ipv4ll.h"
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#include "alloc-util.h"
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#include "in-addr-util.h"
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#include "list.h"
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#include "random-util.h"
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#include "refcnt.h"
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#include "siphash24.h"
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#include "sparse-endian.h"
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#include "util.h"
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#define IPV4LL_NETWORK 0xA9FE0000L
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#define IPV4LL_NETMASK 0xFFFF0000L
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#define IPV4LL_DONT_DESTROY(ll) \
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_cleanup_(sd_ipv4ll_unrefp) _unused_ sd_ipv4ll *_dont_destroy_##ll = sd_ipv4ll_ref(ll)
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struct sd_ipv4ll {
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unsigned n_ref;
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sd_ipv4acd *acd;
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be32_t address; /* the address pushed to ACD */
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struct random_data *random_data;
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char *random_data_state;
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/* External */
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be32_t claimed_address;
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sd_ipv4ll_callback_t cb;
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void* userdata;
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};
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sd_ipv4ll *sd_ipv4ll_ref(sd_ipv4ll *ll) {
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if (!ll)
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return NULL;
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assert(ll->n_ref >= 1);
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ll->n_ref++;
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return ll;
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}
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sd_ipv4ll *sd_ipv4ll_unref(sd_ipv4ll *ll) {
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if (!ll)
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return NULL;
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assert(ll->n_ref >= 1);
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ll->n_ref--;
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if (ll->n_ref > 0)
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return NULL;
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sd_ipv4acd_unref(ll->acd);
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free(ll->random_data);
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free(ll->random_data_state);
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free(ll);
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return NULL;
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}
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static void ipv4ll_on_acd(sd_ipv4acd *ll, int event, void *userdata);
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int sd_ipv4ll_new(sd_ipv4ll **ret) {
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_cleanup_(sd_ipv4ll_unrefp) sd_ipv4ll *ll = NULL;
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int r;
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assert_return(ret, -EINVAL);
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ll = new0(sd_ipv4ll, 1);
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if (!ll)
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return -ENOMEM;
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ll->n_ref = 1;
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r = sd_ipv4acd_new(&ll->acd);
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if (r < 0)
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return r;
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r = sd_ipv4acd_set_callback(ll->acd, ipv4ll_on_acd, ll);
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if (r < 0)
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return r;
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*ret = ll;
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ll = NULL;
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return 0;
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}
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int sd_ipv4ll_stop(sd_ipv4ll *ll) {
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int r;
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assert_return(ll, -EINVAL);
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r = sd_ipv4acd_stop(ll->acd);
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if (r < 0)
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return r;
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return 0;
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}
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int sd_ipv4ll_set_index(sd_ipv4ll *ll, int interface_index) {
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assert_return(ll, -EINVAL);
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return sd_ipv4acd_set_index(ll->acd, interface_index);
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}
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#define HASH_KEY SD_ID128_MAKE(df,04,22,98,3f,ad,14,52,f9,87,2e,d1,9c,70,e2,f2)
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int sd_ipv4ll_set_mac(sd_ipv4ll *ll, const struct ether_addr *addr) {
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int r;
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assert_return(ll, -EINVAL);
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if (!ll->random_data) {
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uint64_t seed;
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/* If no random data is set, generate some from the MAC */
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seed = siphash24(&addr->ether_addr_octet, ETH_ALEN, HASH_KEY.bytes);
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assert_cc(sizeof(unsigned) <= 8);
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r = sd_ipv4ll_set_address_seed(ll, (unsigned) htole64(seed));
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if (r < 0)
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return r;
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}
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return sd_ipv4acd_set_mac(ll->acd, addr);
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}
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int sd_ipv4ll_detach_event(sd_ipv4ll *ll) {
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assert_return(ll, -EINVAL);
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return sd_ipv4acd_detach_event(ll->acd);
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}
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int sd_ipv4ll_attach_event(sd_ipv4ll *ll, sd_event *event, int64_t priority) {
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int r;
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assert_return(ll, -EINVAL);
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r = sd_ipv4acd_attach_event(ll->acd, event, priority);
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if (r < 0)
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return r;
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return 0;
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}
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int sd_ipv4ll_set_callback(sd_ipv4ll *ll, sd_ipv4ll_callback_t cb, void *userdata) {
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assert_return(ll, -EINVAL);
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ll->cb = cb;
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ll->userdata = userdata;
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return 0;
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}
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int sd_ipv4ll_get_address(sd_ipv4ll *ll, struct in_addr *address) {
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assert_return(ll, -EINVAL);
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assert_return(address, -EINVAL);
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if (ll->claimed_address == 0)
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return -ENOENT;
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address->s_addr = ll->claimed_address;
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return 0;
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}
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int sd_ipv4ll_set_address_seed(sd_ipv4ll *ll, unsigned seed) {
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_cleanup_free_ struct random_data *random_data = NULL;
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_cleanup_free_ char *random_data_state = NULL;
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int r;
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assert_return(ll, -EINVAL);
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random_data = new0(struct random_data, 1);
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if (!random_data)
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return -ENOMEM;
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random_data_state = new0(char, 128);
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if (!random_data_state)
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return -ENOMEM;
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r = initstate_r(seed, random_data_state, 128, random_data);
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if (r < 0)
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return r;
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free(ll->random_data);
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ll->random_data = random_data;
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random_data = NULL;
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free(ll->random_data_state);
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ll->random_data_state = random_data_state;
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random_data_state = NULL;
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return 0;
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}
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int sd_ipv4ll_is_running(sd_ipv4ll *ll) {
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assert_return(ll, false);
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return sd_ipv4acd_is_running(ll->acd);
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}
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static bool ipv4ll_address_is_valid(const struct in_addr *address) {
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uint32_t addr;
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assert(address);
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if (!in_addr_is_link_local(AF_INET, (const union in_addr_union *) address))
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return false;
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addr = be32toh(address->s_addr);
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if ((addr & 0x0000FF00) == 0x0000 ||
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(addr & 0x0000FF00) == 0xFF00)
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return false;
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return true;
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}
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int sd_ipv4ll_set_address(sd_ipv4ll *ll, const struct in_addr *address) {
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int r;
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assert_return(ll, -EINVAL);
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assert_return(address, -EINVAL);
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assert_return(ipv4ll_address_is_valid(address), -EINVAL);
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r = sd_ipv4acd_set_address(ll->acd, address);
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if (r < 0)
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return r;
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ll->address = address->s_addr;
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return 0;
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}
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static int ipv4ll_pick_address(sd_ipv4ll *ll) {
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struct in_addr in_addr;
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be32_t addr;
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int r;
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int32_t random;
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assert(ll);
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assert(ll->random_data);
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do {
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r = random_r(ll->random_data, &random);
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if (r < 0)
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return r;
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addr = htonl((random & 0x0000FFFF) | IPV4LL_NETWORK);
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} while (addr == ll->address ||
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(ntohl(addr) & 0x0000FF00) == 0x0000 ||
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(ntohl(addr) & 0x0000FF00) == 0xFF00);
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in_addr.s_addr = addr;
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r = sd_ipv4ll_set_address(ll, &in_addr);
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if (r < 0)
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return r;
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return 0;
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}
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int sd_ipv4ll_start(sd_ipv4ll *ll) {
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int r;
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assert_return(ll, -EINVAL);
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assert_return(ll->random_data, -EINVAL);
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if (ll->address == 0) {
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r = ipv4ll_pick_address(ll);
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if (r < 0)
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return r;
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}
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r = sd_ipv4acd_start(ll->acd);
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if (r < 0)
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return r;
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return 0;
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}
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static void ipv4ll_client_notify(sd_ipv4ll *ll, int event) {
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assert(ll);
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if (ll->cb)
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ll->cb(ll, event, ll->userdata);
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}
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void ipv4ll_on_acd(sd_ipv4acd *acd, int event, void *userdata) {
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sd_ipv4ll *ll = userdata;
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IPV4LL_DONT_DESTROY(ll);
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int r;
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assert(acd);
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assert(ll);
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switch (event) {
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case SD_IPV4ACD_EVENT_STOP:
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ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_STOP);
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ll->claimed_address = 0;
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break;
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case SD_IPV4ACD_EVENT_BIND:
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ll->claimed_address = ll->address;
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ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_BIND);
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break;
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case SD_IPV4ACD_EVENT_CONFLICT:
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/* if an address was already bound we must call up to the
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user to handle this, otherwise we just try again */
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if (ll->claimed_address != 0) {
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ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_CONFLICT);
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ll->claimed_address = 0;
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} else {
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r = ipv4ll_pick_address(ll);
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if (r < 0)
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goto error;
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r = sd_ipv4acd_start(ll->acd);
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if (r < 0)
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goto error;
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}
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break;
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default:
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assert_not_reached("Invalid IPv4ACD event.");
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}
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return;
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error:
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ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_STOP);
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}
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