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Diffstat (limited to 'src/libsystemd-network/sd-ipv4ll.c')
-rw-r--r--src/libsystemd-network/sd-ipv4ll.c697
1 files changed, 197 insertions, 500 deletions
diff --git a/src/libsystemd-network/sd-ipv4ll.c b/src/libsystemd-network/sd-ipv4ll.c
index 9e04db96bb..5603a533a5 100644
--- a/src/libsystemd-network/sd-ipv4ll.c
+++ b/src/libsystemd-network/sd-ipv4ll.c
@@ -2,6 +2,7 @@
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
@@ -17,633 +18,329 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
-#include <stdlib.h>
+#include <arpa/inet.h>
#include <errno.h>
-#include <string.h>
#include <stdio.h>
-#include <arpa/inet.h>
+#include <stdlib.h>
+#include <string.h>
-#include "util.h"
-#include "siphash24.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 "refcnt.h"
#include "random-util.h"
+#include "siphash24.h"
+#include "sparse-endian.h"
+#include "string-util.h"
+#include "util.h"
-#include "ipv4ll-internal.h"
-#include "sd-ipv4ll.h"
+#define IPV4LL_NETWORK UINT32_C(0xA9FE0000)
+#define IPV4LL_NETMASK UINT32_C(0xFFFF0000)
-/* Constants from the RFC */
-#define PROBE_WAIT 1
-#define PROBE_NUM 3
-#define PROBE_MIN 1
-#define PROBE_MAX 2
-#define ANNOUNCE_WAIT 2
-#define ANNOUNCE_NUM 2
-#define ANNOUNCE_INTERVAL 2
-#define MAX_CONFLICTS 10
-#define RATE_LIMIT_INTERVAL 60
-#define DEFEND_INTERVAL 10
-
-#define IPV4LL_NETWORK 0xA9FE0000L
-#define IPV4LL_NETMASK 0xFFFF0000L
-
-typedef enum IPv4LLTrigger{
- IPV4LL_TRIGGER_NULL,
- IPV4LL_TRIGGER_PACKET,
- IPV4LL_TRIGGER_TIMEOUT,
- _IPV4LL_TRIGGER_MAX,
- _IPV4LL_TRIGGER_INVALID = -1
-} IPv4LLTrigger;
-
-typedef enum IPv4LLState {
- IPV4LL_STATE_INIT,
- IPV4LL_STATE_WAITING_PROBE,
- IPV4LL_STATE_PROBING,
- IPV4LL_STATE_WAITING_ANNOUNCE,
- IPV4LL_STATE_ANNOUNCING,
- IPV4LL_STATE_RUNNING,
- IPV4LL_STATE_STOPPED,
- _IPV4LL_STATE_MAX,
- _IPV4LL_STATE_INVALID = -1
-} IPv4LLState;
+#define IPV4LL_DONT_DESTROY(ll) \
+ _cleanup_(sd_ipv4ll_unrefp) _unused_ sd_ipv4ll *_dont_destroy_##ll = sd_ipv4ll_ref(ll)
struct sd_ipv4ll {
- RefCount n_ref;
-
- IPv4LLState state;
- int index;
- int fd;
- union sockaddr_union link;
- int iteration;
- int conflict;
- sd_event_source *receive_message;
- sd_event_source *timer;
- usec_t next_wakeup;
- usec_t defend_window;
- int next_wakeup_valid;
- be32_t address;
- struct random_data *random_data;
- char *random_data_state;
+ unsigned n_ref;
+
+ sd_ipv4acd *acd;
+
+ be32_t address; /* the address pushed to ACD */
+ struct ether_addr mac;
+
+ struct {
+ le64_t value;
+ le64_t generation;
+ } seed;
+ bool seed_set;
+
/* External */
be32_t claimed_address;
- struct ether_addr mac_addr;
- sd_event *event;
- int event_priority;
- sd_ipv4ll_cb_t cb;
+
+ sd_ipv4ll_callback_t callback;
void* userdata;
};
-static void ipv4ll_run_state_machine(sd_ipv4ll *ll, IPv4LLTrigger trigger, void *trigger_data);
-
-static void ipv4ll_set_state(sd_ipv4ll *ll, IPv4LLState st, int reset_counter) {
+#define log_ipv4ll_errno(ll, error, fmt, ...) log_internal(LOG_DEBUG, error, __FILE__, __LINE__, __func__, "IPV4LL: " fmt, ##__VA_ARGS__)
+#define log_ipv4ll(ll, fmt, ...) log_ipv4ll_errno(ll, 0, fmt, ##__VA_ARGS__)
- assert(ll);
- assert(st < _IPV4LL_STATE_MAX);
-
- if (st == ll->state && !reset_counter) {
- ll->iteration++;
- } else {
- ll->state = st;
- ll->iteration = 0;
- }
-}
+static void ipv4ll_on_acd(sd_ipv4acd *ll, int event, void *userdata);
-static sd_ipv4ll *ipv4ll_client_notify(sd_ipv4ll *ll, int event) {
- assert(ll);
+sd_ipv4ll *sd_ipv4ll_ref(sd_ipv4ll *ll) {
+ if (!ll)
+ return NULL;
- if (ll->cb) {
- ll = sd_ipv4ll_ref(ll);
- ll->cb(ll, event, ll->userdata);
- ll = sd_ipv4ll_unref(ll);
- }
+ assert(ll->n_ref >= 1);
+ ll->n_ref++;
return ll;
}
-static sd_ipv4ll *ipv4ll_stop(sd_ipv4ll *ll, int event) {
- assert(ll);
-
- ll->receive_message = sd_event_source_unref(ll->receive_message);
- ll->fd = safe_close(ll->fd);
-
- ll->timer = sd_event_source_unref(ll->timer);
+sd_ipv4ll *sd_ipv4ll_unref(sd_ipv4ll *ll) {
+ if (!ll)
+ return NULL;
- log_ipv4ll(ll, "STOPPED");
+ assert(ll->n_ref >= 1);
+ ll->n_ref--;
- ll = ipv4ll_client_notify(ll, event);
+ if (ll->n_ref > 0)
+ return NULL;
- if (ll) {
- ll->claimed_address = 0;
- ipv4ll_set_state (ll, IPV4LL_STATE_INIT, 1);
- }
+ sd_ipv4acd_unref(ll->acd);
+ free(ll);
- return ll;
+ return NULL;
}
-static int ipv4ll_pick_address(sd_ipv4ll *ll, be32_t *address) {
- be32_t addr;
+int sd_ipv4ll_new(sd_ipv4ll **ret) {
+ _cleanup_(sd_ipv4ll_unrefp) sd_ipv4ll *ll = NULL;
int r;
- int32_t random;
- assert(ll);
- assert(address);
- assert(ll->random_data);
+ assert_return(ret, -EINVAL);
- 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) & IPV4LL_NETMASK) != IPV4LL_NETWORK ||
- (ntohl(addr) & 0x0000FF00) == 0x0000 ||
- (ntohl(addr) & 0x0000FF00) == 0xFF00);
+ ll = new0(sd_ipv4ll, 1);
+ if (!ll)
+ return -ENOMEM;
- *address = addr;
- return 0;
-}
+ ll->n_ref = 1;
-static int ipv4ll_timer(sd_event_source *s, uint64_t usec, void *userdata) {
- sd_ipv4ll *ll = (sd_ipv4ll*)userdata;
+ r = sd_ipv4acd_new(&ll->acd);
+ if (r < 0)
+ return r;
- assert(ll);
+ r = sd_ipv4acd_set_callback(ll->acd, ipv4ll_on_acd, ll);
+ if (r < 0)
+ return r;
- ll->next_wakeup_valid = 0;
- ipv4ll_run_state_machine(ll, IPV4LL_TRIGGER_TIMEOUT, NULL);
+ *ret = ll;
+ ll = NULL;
return 0;
}
-static void ipv4ll_set_next_wakeup(sd_ipv4ll *ll, int sec, int random_sec) {
- usec_t next_timeout = 0;
- usec_t time_now = 0;
-
- assert(sec >= 0);
- assert(random_sec >= 0);
- assert(ll);
-
- next_timeout = sec * USEC_PER_SEC;
-
- if (random_sec)
- next_timeout += random_u32() % (random_sec * USEC_PER_SEC);
-
- if (sd_event_now(ll->event, clock_boottime_or_monotonic(), &time_now) < 0)
- time_now = now(clock_boottime_or_monotonic());
-
- ll->next_wakeup = time_now + next_timeout;
- ll->next_wakeup_valid = 1;
-}
-
-static bool ipv4ll_arp_conflict (sd_ipv4ll *ll, struct ether_arp *arp) {
- assert(ll);
- assert(arp);
-
- if (memcmp(arp->arp_spa, &ll->address, sizeof(ll->address)) == 0 &&
- memcmp(arp->arp_sha, &ll->mac_addr, ETH_ALEN) != 0)
- return true;
-
- return false;
-}
-
-static bool ipv4ll_arp_probe_conflict (sd_ipv4ll *ll, struct ether_arp *arp) {
- assert(ll);
- assert(arp);
-
- if (ipv4ll_arp_conflict(ll, arp))
- return true;
-
- if (memcmp(arp->arp_tpa, &ll->address, sizeof(ll->address)) == 0 &&
- memcmp(arp->arp_sha, &ll->mac_addr, ETH_ALEN))
- return true;
-
- return false;
-}
-
-static void ipv4ll_run_state_machine(sd_ipv4ll *ll, IPv4LLTrigger trigger, void *trigger_data) {
- struct ether_arp out_packet;
- int out_packet_ready = 0;
- int r = 0;
-
- assert(ll);
- assert(trigger < _IPV4LL_TRIGGER_MAX);
-
- if (ll->state == IPV4LL_STATE_INIT) {
-
- log_ipv4ll(ll, "PROBE");
- ipv4ll_set_state(ll, IPV4LL_STATE_WAITING_PROBE, 1);
- ipv4ll_set_next_wakeup(ll, 0, PROBE_WAIT);
-
- } else if ((ll->state == IPV4LL_STATE_WAITING_PROBE && trigger == IPV4LL_TRIGGER_TIMEOUT) ||
- (ll->state == IPV4LL_STATE_PROBING && trigger == IPV4LL_TRIGGER_TIMEOUT && ll->iteration < PROBE_NUM-2)) {
-
- /* Send a probe */
- arp_packet_probe(&out_packet, ll->address, &ll->mac_addr);
- out_packet_ready = 1;
- ipv4ll_set_state(ll, IPV4LL_STATE_PROBING, 0);
-
- ipv4ll_set_next_wakeup(ll, PROBE_MIN, (PROBE_MAX-PROBE_MIN));
-
- } else if (ll->state == IPV4LL_STATE_PROBING && trigger == IPV4LL_TRIGGER_TIMEOUT && ll->iteration >= PROBE_NUM-2) {
-
- /* Send the last probe */
- arp_packet_probe(&out_packet, ll->address, &ll->mac_addr);
- out_packet_ready = 1;
- ipv4ll_set_state(ll, IPV4LL_STATE_WAITING_ANNOUNCE, 1);
-
- ipv4ll_set_next_wakeup(ll, ANNOUNCE_WAIT, 0);
-
- } else if ((ll->state == IPV4LL_STATE_WAITING_ANNOUNCE && trigger == IPV4LL_TRIGGER_TIMEOUT) ||
- (ll->state == IPV4LL_STATE_ANNOUNCING && trigger == IPV4LL_TRIGGER_TIMEOUT && ll->iteration < ANNOUNCE_NUM-1)) {
-
- /* Send announcement packet */
- arp_packet_announcement(&out_packet, ll->address, &ll->mac_addr);
- out_packet_ready = 1;
- ipv4ll_set_state(ll, IPV4LL_STATE_ANNOUNCING, 0);
-
- ipv4ll_set_next_wakeup(ll, ANNOUNCE_INTERVAL, 0);
-
- if (ll->iteration == 0) {
- log_ipv4ll(ll, "ANNOUNCE");
- ll->claimed_address = ll->address;
- ll = ipv4ll_client_notify(ll, IPV4LL_EVENT_BIND);
- if (!ll || ll->state == IPV4LL_STATE_STOPPED)
- goto out;
-
- ll->conflict = 0;
- }
-
- } else if ((ll->state == IPV4LL_STATE_ANNOUNCING && trigger == IPV4LL_TRIGGER_TIMEOUT &&
- ll->iteration >= ANNOUNCE_NUM-1)) {
-
- ipv4ll_set_state(ll, IPV4LL_STATE_RUNNING, 0);
- ll->next_wakeup_valid = 0;
-
- } else if (trigger == IPV4LL_TRIGGER_PACKET) {
-
- int conflicted = 0;
- usec_t time_now;
- struct ether_arp* in_packet = (struct ether_arp*)trigger_data;
-
- assert(in_packet);
-
- if (IN_SET(ll->state, IPV4LL_STATE_ANNOUNCING, IPV4LL_STATE_RUNNING)) {
-
- if (ipv4ll_arp_conflict(ll, in_packet)) {
-
- r = sd_event_now(ll->event, clock_boottime_or_monotonic(), &time_now);
- if (r < 0)
- goto out;
-
- /* Defend address */
- if (time_now > ll->defend_window) {
- ll->defend_window = time_now + DEFEND_INTERVAL * USEC_PER_SEC;
- arp_packet_announcement(&out_packet, ll->address, &ll->mac_addr);
- out_packet_ready = 1;
- } else
- conflicted = 1;
- }
-
- } else if (IN_SET(ll->state, IPV4LL_STATE_WAITING_PROBE,
- IPV4LL_STATE_PROBING,
- IPV4LL_STATE_WAITING_ANNOUNCE)) {
-
- conflicted = ipv4ll_arp_probe_conflict(ll, in_packet);
- }
-
- if (conflicted) {
- log_ipv4ll(ll, "CONFLICT");
- ll = ipv4ll_client_notify(ll, IPV4LL_EVENT_CONFLICT);
- if (!ll || ll->state == IPV4LL_STATE_STOPPED)
- goto out;
-
- ll->claimed_address = 0;
-
- /* Pick a new address */
- r = ipv4ll_pick_address(ll, &ll->address);
- if (r < 0)
- goto out;
- ll->conflict++;
- ll->defend_window = 0;
- ipv4ll_set_state(ll, IPV4LL_STATE_WAITING_PROBE, 1);
-
- if (ll->conflict >= MAX_CONFLICTS) {
- log_ipv4ll(ll, "MAX_CONFLICTS");
- ipv4ll_set_next_wakeup(ll, RATE_LIMIT_INTERVAL, PROBE_WAIT);
- } else
- ipv4ll_set_next_wakeup(ll, 0, PROBE_WAIT);
-
- }
- }
-
- if (out_packet_ready) {
- r = arp_network_send_raw_socket(ll->fd, &ll->link, &out_packet);
- if (r < 0) {
- log_ipv4ll(ll, "failed to send arp packet out");
- goto out;
- }
- }
-
- if (ll->next_wakeup_valid) {
- ll->timer = sd_event_source_unref(ll->timer);
- r = sd_event_add_time(ll->event, &ll->timer, clock_boottime_or_monotonic(),
- ll->next_wakeup, 0, ipv4ll_timer, ll);
- if (r < 0)
- goto out;
-
- r = sd_event_source_set_priority(ll->timer, ll->event_priority);
- if (r < 0)
- goto out;
-
- r = sd_event_source_set_description(ll->timer, "ipv4ll-timer");
- if (r < 0)
- goto out;
- }
-
-out:
- if (r < 0 && ll)
- ipv4ll_stop(ll, r);
-}
-
-static int ipv4ll_receive_message(sd_event_source *s, int fd,
- uint32_t revents, void *userdata) {
- int r;
- struct ether_arp arp;
- sd_ipv4ll *ll = (sd_ipv4ll*)userdata;
-
- assert(ll);
-
- r = read(fd, &arp, sizeof(struct ether_arp));
- if (r < (int) sizeof(struct ether_arp))
- return 0;
-
- r = arp_packet_verify_headers(&arp);
- if (r < 0)
- return 0;
-
- ipv4ll_run_state_machine(ll, IPV4LL_TRIGGER_PACKET, &arp);
+int sd_ipv4ll_stop(sd_ipv4ll *ll) {
+ assert_return(ll, -EINVAL);
- return 0;
+ return sd_ipv4acd_stop(ll->acd);
}
-int sd_ipv4ll_set_index(sd_ipv4ll *ll, int interface_index) {
+int sd_ipv4ll_set_ifindex(sd_ipv4ll *ll, int ifindex) {
assert_return(ll, -EINVAL);
- assert_return(interface_index > 0, -EINVAL);
- assert_return(IN_SET(ll->state, IPV4LL_STATE_INIT,
- IPV4LL_STATE_STOPPED), -EBUSY);
-
- ll->index = interface_index;
+ assert_return(ifindex > 0, -EINVAL);
+ assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY);
- return 0;
+ return sd_ipv4acd_set_ifindex(ll->acd, ifindex);
}
int sd_ipv4ll_set_mac(sd_ipv4ll *ll, const struct ether_addr *addr) {
- bool need_restart = false;
+ int r;
assert_return(ll, -EINVAL);
assert_return(addr, -EINVAL);
+ assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY);
- if (memcmp(&ll->mac_addr, addr, ETH_ALEN) == 0)
- return 0;
-
- if (!IN_SET(ll->state, IPV4LL_STATE_INIT, IPV4LL_STATE_STOPPED)) {
- log_ipv4ll(ll, "Changing MAC address on running IPv4LL "
- "client, restarting");
- ll = ipv4ll_stop(ll, IPV4LL_EVENT_STOP);
- need_restart = true;
- }
-
- if (!ll)
- return 0;
-
- memcpy(&ll->mac_addr, addr, ETH_ALEN);
-
- if (need_restart)
- sd_ipv4ll_start(ll);
+ r = sd_ipv4acd_set_mac(ll->acd, addr);
+ if (r < 0)
+ return r;
+ ll->mac = *addr;
return 0;
}
int sd_ipv4ll_detach_event(sd_ipv4ll *ll) {
assert_return(ll, -EINVAL);
- ll->event = sd_event_unref(ll->event);
-
- return 0;
+ return sd_ipv4acd_detach_event(ll->acd);
}
-int sd_ipv4ll_attach_event(sd_ipv4ll *ll, sd_event *event, int priority) {
- int r;
-
+int sd_ipv4ll_attach_event(sd_ipv4ll *ll, sd_event *event, int64_t priority) {
assert_return(ll, -EINVAL);
- assert_return(!ll->event, -EBUSY);
-
- if (event)
- ll->event = sd_event_ref(event);
- else {
- r = sd_event_default(&ll->event);
- if (r < 0) {
- ipv4ll_stop(ll, IPV4LL_EVENT_STOP);
- return r;
- }
- }
-
- ll->event_priority = priority;
- return 0;
+ return sd_ipv4acd_attach_event(ll->acd, event, priority);
}
-int sd_ipv4ll_set_callback(sd_ipv4ll *ll, sd_ipv4ll_cb_t cb, void *userdata) {
+int sd_ipv4ll_set_callback(sd_ipv4ll *ll, sd_ipv4ll_callback_t cb, void *userdata) {
assert_return(ll, -EINVAL);
- ll->cb = cb;
+ ll->callback = cb;
ll->userdata = userdata;
return 0;
}
-int sd_ipv4ll_get_address(sd_ipv4ll *ll, struct in_addr *address){
+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) {
+ if (ll->claimed_address == 0)
return -ENOENT;
- }
address->s_addr = ll->claimed_address;
+
return 0;
}
-int sd_ipv4ll_set_address_seed (sd_ipv4ll *ll, uint8_t seed[8]) {
- unsigned int entropy;
- int r;
-
+int sd_ipv4ll_set_address_seed(sd_ipv4ll *ll, uint64_t seed) {
assert_return(ll, -EINVAL);
- assert_return(seed, -EINVAL);
+ assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY);
- entropy = *seed;
+ ll->seed.value = htole64(seed);
+ ll->seed_set = true;
- free(ll->random_data);
- free(ll->random_data_state);
+ return 0;
+}
- ll->random_data = new0(struct random_data, 1);
- ll->random_data_state = new0(char, 128);
+int sd_ipv4ll_is_running(sd_ipv4ll *ll) {
+ assert_return(ll, false);
- if (!ll->random_data || !ll->random_data_state) {
- r = -ENOMEM;
- goto error;
- }
+ return sd_ipv4acd_is_running(ll->acd);
+}
- r = initstate_r((unsigned int)entropy, ll->random_data_state, 128, ll->random_data);
- if (r < 0)
- goto error;
+static bool ipv4ll_address_is_valid(const struct in_addr *address) {
+ assert(address);
-error:
- if (r < 0){
- free(ll->random_data);
- free(ll->random_data_state);
- ll->random_data = NULL;
- ll->random_data_state = NULL;
- }
- return r;
+ if (!in_addr_is_link_local(AF_INET, (const union in_addr_union *) address))
+ return false;
+
+ return !IN_SET(be32toh(address->s_addr) & 0x0000FF00U, 0x0000U, 0xFF00U);
}
-bool sd_ipv4ll_is_running(sd_ipv4ll *ll) {
+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);
- return !IN_SET(ll->state, IPV4LL_STATE_INIT, IPV4LL_STATE_STOPPED);
-}
+ r = sd_ipv4acd_set_address(ll->acd, address);
+ if (r < 0)
+ return r;
-#define HASH_KEY SD_ID128_MAKE(df,04,22,98,3f,ad,14,52,f9,87,2e,d1,9c,70,e2,f2)
+ ll->address = address->s_addr;
-int sd_ipv4ll_start (sd_ipv4ll *ll) {
- int r;
+ return 0;
+}
- assert_return(ll, -EINVAL);
- assert_return(ll->event, -EINVAL);
- assert_return(ll->index > 0, -EINVAL);
- assert_return(IN_SET(ll->state, IPV4LL_STATE_INIT,
- IPV4LL_STATE_STOPPED), -EBUSY);
+#define PICK_HASH_KEY SD_ID128_MAKE(15,ac,82,a6,d6,3f,49,78,98,77,5d,0c,69,02,94,0b)
- ll->state = IPV4LL_STATE_INIT;
+static int ipv4ll_pick_address(sd_ipv4ll *ll) {
+ _cleanup_free_ char *address = NULL;
+ be32_t addr;
- r = arp_network_bind_raw_socket(ll->index, &ll->link);
+ assert(ll);
- if (r < 0)
- goto out;
+ do {
+ uint64_t h;
- ll->fd = r;
- ll->conflict = 0;
- ll->defend_window = 0;
- ll->claimed_address = 0;
+ h = siphash24(&ll->seed, sizeof(ll->seed), PICK_HASH_KEY.bytes);
- if (!ll->random_data) {
- uint8_t seed[8];
+ /* Increase the generation counter by one */
+ ll->seed.generation = htole64(le64toh(ll->seed.generation) + 1);
- /* Fallback to mac */
- siphash24(seed, &ll->mac_addr.ether_addr_octet,
- ETH_ALEN, HASH_KEY.bytes);
+ addr = htobe32((h & UINT32_C(0x0000FFFF)) | IPV4LL_NETWORK);
+ } while (addr == ll->address ||
+ IN_SET(be32toh(addr) & 0x0000FF00U, 0x0000U, 0xFF00U));
- r = sd_ipv4ll_set_address_seed(ll, seed);
- if (r < 0)
- goto out;
- }
+ (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));
- if (ll->address == 0) {
- r = ipv4ll_pick_address(ll, &ll->address);
- if (r < 0)
- goto out;
- }
+ return sd_ipv4ll_set_address(ll, &(struct in_addr) { addr });
+}
- ipv4ll_set_state (ll, IPV4LL_STATE_INIT, 1);
+#define MAC_HASH_KEY SD_ID128_MAKE(df,04,22,98,3f,ad,14,52,f9,87,2e,d1,9c,70,e2,f2)
- r = sd_event_add_io(ll->event, &ll->receive_message, ll->fd,
- EPOLLIN, ipv4ll_receive_message, ll);
- if (r < 0)
- goto out;
+int sd_ipv4ll_start(sd_ipv4ll *ll) {
+ int r;
+ bool picked_address = false;
- r = sd_event_source_set_priority(ll->receive_message, ll->event_priority);
- if (r < 0)
- goto out;
+ assert_return(ll, -EINVAL);
+ assert_return(!ether_addr_is_null(&ll->mac), -EINVAL);
+ assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY);
- r = sd_event_source_set_description(ll->receive_message, "ipv4ll-receive-message");
- if (r < 0)
- goto out;
+ /* 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));
- r = sd_event_add_time(ll->event,
- &ll->timer,
- clock_boottime_or_monotonic(),
- now(clock_boottime_or_monotonic()), 0,
- ipv4ll_timer, ll);
+ /* Restart the generation counter. */
+ ll->seed.generation = 0;
- if (r < 0)
- goto out;
+ if (ll->address == 0) {
+ r = ipv4ll_pick_address(ll);
+ if (r < 0)
+ return r;
- r = sd_event_source_set_priority(ll->timer, ll->event_priority);
- if (r < 0)
- goto out;
+ picked_address = true;
+ }
- r = sd_event_source_set_description(ll->timer, "ipv4ll-timer");
-out:
- if (r < 0)
- ipv4ll_stop(ll, IPV4LL_EVENT_STOP);
+ r = sd_ipv4acd_start(ll->acd);
+ if (r < 0) {
- return 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;
-int sd_ipv4ll_stop(sd_ipv4ll *ll) {
- ipv4ll_stop(ll, IPV4LL_EVENT_STOP);
- if (ll)
- ipv4ll_set_state(ll, IPV4LL_STATE_STOPPED, 1);
+ return r;
+ }
return 0;
}
-sd_ipv4ll *sd_ipv4ll_ref(sd_ipv4ll *ll) {
- if (ll)
- assert_se(REFCNT_INC(ll->n_ref) >= 2);
+static void ipv4ll_client_notify(sd_ipv4ll *ll, int event) {
+ assert(ll);
- return ll;
+ if (ll->callback)
+ ll->callback(ll, event, ll->userdata);
}
-sd_ipv4ll *sd_ipv4ll_unref(sd_ipv4ll *ll) {
- if (ll && REFCNT_DEC(ll->n_ref) == 0) {
- ll->receive_message =
- sd_event_source_unref(ll->receive_message);
- ll->fd = safe_close(ll->fd);
-
- ll->timer = sd_event_source_unref(ll->timer);
+void ipv4ll_on_acd(sd_ipv4acd *acd, int event, void *userdata) {
+ sd_ipv4ll *ll = userdata;
+ IPV4LL_DONT_DESTROY(ll);
+ int r;
- sd_ipv4ll_detach_event(ll);
+ assert(acd);
+ assert(ll);
- free(ll->random_data);
- free(ll->random_data_state);
- free(ll);
+ switch (event) {
- return NULL;
- }
+ case SD_IPV4ACD_EVENT_STOP:
+ ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_STOP);
+ ll->claimed_address = 0;
+ break;
- return ll;
-}
+ case SD_IPV4ACD_EVENT_BIND:
+ ll->claimed_address = ll->address;
+ ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_BIND);
+ break;
-DEFINE_TRIVIAL_CLEANUP_FUNC(sd_ipv4ll*, sd_ipv4ll_unref);
-#define _cleanup_ipv4ll_free_ _cleanup_(sd_ipv4ll_unrefp)
+ 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);
-int sd_ipv4ll_new(sd_ipv4ll **ret) {
- _cleanup_ipv4ll_free_ sd_ipv4ll *ll = NULL;
+ ll->claimed_address = 0;
+ } else {
+ r = ipv4ll_pick_address(ll);
+ if (r < 0)
+ goto error;
- assert_return(ret, -EINVAL);
+ r = sd_ipv4acd_start(ll->acd);
+ if (r < 0)
+ goto error;
+ }
- ll = new0(sd_ipv4ll, 1);
- if (!ll)
- return -ENOMEM;
+ break;
- ll->n_ref = REFCNT_INIT;
- ll->state = IPV4LL_STATE_INIT;
- ll->index = -1;
- ll->fd = -1;
+ default:
+ assert_not_reached("Invalid IPv4ACD event.");
+ }
- *ret = ll;
- ll = NULL;
+ return;
- return 0;
+error:
+ ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_STOP);
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-22 23:44:53 +0000