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gnrc_netif.c
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/*
* Copyright (C) 2014-20 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @{
*
* @file
* @author Martine Lenders <m.lenders@fu-berlin.de>
* @author René Kijewski <rene.kijewski@fu-berlin.de>
* @author Oliver Hahm <oliver.hahm@inria.fr>
*/
#include <assert.h>
#include <limits.h>
#include <string.h>
#include <kernel_defines.h>
#include "bitfield.h"
#include "event.h"
#include "net/ethernet.h"
#include "net/ipv6.h"
#include "net/gnrc.h"
#include "net/gnrc/ipv6/nib.h"
#include "net/gnrc/ipv6.h"
#if IS_USED(MODULE_GNRC_NETIF_PKTQ)
#include "net/gnrc/netif/pktq.h"
#endif /* IS_USED(MODULE_GNRC_NETIF_PKTQ) */
#include "net/gnrc/sixlowpan/ctx.h"
#if IS_USED(MODULE_GNRC_SIXLOWPAN_FRAG_SFR)
#include "net/gnrc/sixlowpan/frag/sfr.h"
#endif /* IS_USED(MODULE_GNRC_SIXLOWPAN_FRAG_SFR) */
#include "net/netstats.h"
#include "net/netstats/neighbor.h"
#include "fmt.h"
#include "log.h"
#include "sched.h"
#if IS_USED(MODULE_ZTIMER)
#include "ztimer.h"
#endif
#include "net/gnrc/netif.h"
#include "net/gnrc/netif/internal.h"
#include "net/gnrc/tx_sync.h"
#define ENABLE_DEBUG 0
#include "debug.h"
static void _update_l2addr_from_dev(gnrc_netif_t *netif);
static void _check_netdev_capabilities(netdev_t *dev, bool legacy);
static void *_gnrc_netif_thread(void *args);
static void _event_cb(netdev_t *dev, netdev_event_t event);
typedef struct {
gnrc_netif_t *netif;
mutex_t init_done;
int result;
} _netif_ctx_t;
int gnrc_netif_create(gnrc_netif_t *netif, char *stack, int stacksize,
char priority, const char *name, netdev_t *netdev,
const gnrc_netif_ops_t *ops)
{
int res;
_netif_ctx_t ctx;
if (IS_ACTIVE(DEVELHELP) && gnrc_netif_highlander() && netif_iter(NULL)) {
LOG_WARNING("gnrc_netif: gnrc_netif_highlander() returned true but "
"more than one interface is being registered.\n");
assert(netif_iter(NULL) == NULL);
}
#ifdef MODULE_GNRC_NETIF_BUS
for (int i = 0; i < GNRC_NETIF_BUS_NUMOF; ++i) {
msg_bus_init(&netif->bus[i]);
}
#endif
rmutex_init(&netif->mutex);
netif->ops = ops;
assert(netif->dev == NULL);
netif->dev = netdev;
#ifdef MODULE_NETSTATS_NEIGHBOR
netstats_nb_init(&netif->netif);
#endif
/* prepare thread context */
ctx.netif = netif;
mutex_init(&ctx.init_done);
mutex_lock(&ctx.init_done);
res = thread_create(stack, stacksize, priority, 0,
_gnrc_netif_thread, &ctx, name);
assert(res > 0);
(void)res;
/* wait for result of driver init */
mutex_lock(&ctx.init_done);
return ctx.result;
}
bool gnrc_netif_dev_is_6lo(const gnrc_netif_t *netif)
{
switch (netif->device_type) {
#ifdef MODULE_GNRC_SIXLOENC
case NETDEV_TYPE_ETHERNET:
return (netif->flags & GNRC_NETIF_FLAGS_6LO);
#endif
case NETDEV_TYPE_IEEE802154:
case NETDEV_TYPE_CC110X:
case NETDEV_TYPE_BLE:
case NETDEV_TYPE_NRFMIN:
case NETDEV_TYPE_NRF24L01P_NG:
case NETDEV_TYPE_ESP_NOW:
return true;
default:
return false;
}
}
unsigned gnrc_netif_numof(void)
{
gnrc_netif_t *netif = NULL;
unsigned res = 0;
while ((netif = gnrc_netif_iter(netif))) {
if (netif->ops != NULL) {
res++;
}
}
return res;
}
gnrc_netif_t *gnrc_netif_iter(const gnrc_netif_t *prev)
{
netif_t *result = netif_iter((prev) ? &prev->netif : NULL);
return (result) ? container_of(result, gnrc_netif_t, netif) : NULL;
}
gnrc_netif_t *gnrc_netif_get_by_type(netdev_type_t type, uint8_t index)
{
gnrc_netif_t *netif = NULL;
while ((netif = gnrc_netif_iter(netif))) {
#ifdef MODULE_NETDEV_REGISTER
if (netif->dev->type != type && type != NETDEV_ANY) {
continue;
}
if (netif->dev->index != index && index != NETDEV_INDEX_ANY) {
continue;
}
#else
(void)type;
(void)index;
assert(index == 0);
#endif
return netif;
}
return NULL;
}
int gnrc_netif_get_from_netdev(gnrc_netif_t *netif, gnrc_netapi_opt_t *opt)
{
int res = -ENOTSUP;
gnrc_netif_acquire(netif);
switch (opt->opt) {
case NETOPT_6LO:
assert(opt->data_len == sizeof(netopt_enable_t));
*((netopt_enable_t *)opt->data) =
(netopt_enable_t)gnrc_netif_is_6lo(netif);
res = sizeof(netopt_enable_t);
break;
case NETOPT_HOP_LIMIT:
assert(opt->data_len == sizeof(uint8_t));
*((uint8_t *)opt->data) = netif->cur_hl;
res = sizeof(uint8_t);
break;
case NETOPT_STATS:
switch ((int16_t)opt->context) {
#if IS_USED(MODULE_NETSTATS_IPV6) && IS_USED(MODULE_GNRC_NETIF_IPV6)
case NETSTATS_IPV6:
{
assert(opt->data_len == sizeof(netstats_t));
/* IPv6 thread is updating this, to prevent data
* corruptions, we have to guarantee mutually exclusive
* access */
unsigned irq_state = irq_disable();
memcpy(opt->data, &netif->ipv6.stats,
sizeof(netif->ipv6.stats));
irq_restore(irq_state);
res = sizeof(netif->ipv6.stats);
}
break;
#endif
#ifdef MODULE_NETSTATS_L2
case NETSTATS_LAYER2:
assert(opt->data_len == sizeof(netstats_t));
/* this is only accesses from the netif thread (us), so no need
* to lock this */
memcpy(opt->data, &netif->stats,
sizeof(netif->stats));
res = sizeof(netif->stats);
break;
#endif
default:
/* take from device */
break;
}
break;
#if IS_USED(MODULE_GNRC_NETIF_IPV6)
case NETOPT_IPV6_ADDR: {
assert(opt->data_len >= sizeof(ipv6_addr_t));
ipv6_addr_t *tgt = opt->data;
res = 0;
for (unsigned i = 0;
(res < (int)opt->data_len) &&
(i < CONFIG_GNRC_NETIF_IPV6_ADDRS_NUMOF);
i++) {
if (netif->ipv6.addrs_flags[i] != 0) {
memcpy(tgt, &netif->ipv6.addrs[i], sizeof(ipv6_addr_t));
res += sizeof(ipv6_addr_t);
tgt++;
}
}
}
break;
case NETOPT_IPV6_ADDR_FLAGS: {
assert(opt->data_len >= sizeof(uint8_t));
uint8_t *tgt = opt->data;
res = 0;
for (unsigned i = 0;
(res < (int)opt->data_len) &&
(i < CONFIG_GNRC_NETIF_IPV6_ADDRS_NUMOF);
i++) {
if (netif->ipv6.addrs_flags[i] != 0) {
*tgt = netif->ipv6.addrs_flags[i];
res += sizeof(uint8_t);
tgt++;
}
}
}
break;
case NETOPT_IPV6_GROUP: {
assert(opt->data_len >= sizeof(ipv6_addr_t));
ipv6_addr_t *tgt = opt->data;
res = 0;
for (unsigned i = 0;
(res < (int)opt->data_len) &&
(i < GNRC_NETIF_IPV6_GROUPS_NUMOF);
i++) {
if (!ipv6_addr_is_unspecified(&netif->ipv6.groups[i])) {
memcpy(tgt, &netif->ipv6.groups[i],
sizeof(ipv6_addr_t));
res += sizeof(ipv6_addr_t);
tgt++;
}
}
}
break;
case NETOPT_IPV6_IID:
assert(opt->data_len >= sizeof(eui64_t));
res = gnrc_netif_ipv6_get_iid(netif, opt->data);
break;
case NETOPT_MAX_PDU_SIZE:
if (opt->context == GNRC_NETTYPE_IPV6) {
assert(opt->data_len == sizeof(uint16_t));
*((uint16_t *)opt->data) = netif->ipv6.mtu;
res = sizeof(uint16_t);
}
/* else ask device */
break;
#if IS_ACTIVE(CONFIG_GNRC_IPV6_NIB_ROUTER)
case NETOPT_IPV6_FORWARDING:
assert(opt->data_len == sizeof(netopt_enable_t));
*((netopt_enable_t *)opt->data) = (gnrc_netif_is_rtr(netif)) ?
NETOPT_ENABLE : NETOPT_DISABLE;
res = sizeof(netopt_enable_t);
break;
case NETOPT_IPV6_SND_RTR_ADV:
assert(opt->data_len == sizeof(netopt_enable_t));
*((netopt_enable_t *)opt->data) = (gnrc_netif_is_rtr_adv(netif)) ?
NETOPT_ENABLE : NETOPT_DISABLE;
res = sizeof(netopt_enable_t);
break;
#endif /* CONFIG_GNRC_IPV6_NIB_ROUTER */
#endif /* IS_USED(MODULE_GNRC_NETIF_IPV6) */
#ifdef MODULE_GNRC_SIXLOWPAN_IPHC
case NETOPT_6LO_IPHC:
assert(opt->data_len == sizeof(netopt_enable_t));
*((netopt_enable_t *)opt->data) = (netif->flags &
GNRC_NETIF_FLAGS_6LO_HC)
? NETOPT_ENABLE : NETOPT_DISABLE;
res = sizeof(netopt_enable_t);
break;
#endif /* MODULE_GNRC_SIXLOWPAN_IPHC */
default:
break;
}
if (res == -ENOTSUP) {
res = netif->dev->driver->get(netif->dev, opt->opt, opt->data,
opt->data_len);
}
gnrc_netif_release(netif);
return res;
}
int gnrc_netif_set_from_netdev(gnrc_netif_t *netif,
const gnrc_netapi_opt_t *opt)
{
int res = -ENOTSUP;
gnrc_netif_acquire(netif);
switch (opt->opt) {
case NETOPT_HOP_LIMIT:
assert(opt->data_len == sizeof(uint8_t));
netif->cur_hl = *((uint8_t *)opt->data);
res = sizeof(uint8_t);
break;
#if IS_USED(MODULE_GNRC_NETIF_IPV6)
case NETOPT_IPV6_ADDR: {
assert(opt->data_len == sizeof(ipv6_addr_t));
/* always assume manually added */
uint8_t flags = ((((uint8_t)opt->context & 0xff) &
~GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_MASK) |
GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_VALID);
uint8_t pfx_len = (uint8_t)(opt->context >> 8U);
/* acquire locks a recursive mutex so we are safe calling this
* public function */
res = gnrc_netif_ipv6_addr_add_internal(netif, opt->data,
pfx_len, flags);
if (res >= 0) {
res = sizeof(ipv6_addr_t);
}
}
break;
case NETOPT_IPV6_ADDR_REMOVE:
assert(opt->data_len == sizeof(ipv6_addr_t));
/* acquire locks a recursive mutex so we are safe calling this
* public function */
gnrc_netif_ipv6_addr_remove_internal(netif, opt->data);
res = sizeof(ipv6_addr_t);
break;
case NETOPT_IPV6_GROUP:
assert(opt->data_len == sizeof(ipv6_addr_t));
/* acquire locks a recursive mutex so we are safe calling this
* public function */
res = gnrc_netif_ipv6_group_join_internal(netif, opt->data);
if (res >= 0) {
res = sizeof(ipv6_addr_t);
}
break;
case NETOPT_IPV6_GROUP_LEAVE:
assert(opt->data_len == sizeof(ipv6_addr_t));
/* acquire locks a recursive mutex so we are safe calling this
* public function */
gnrc_netif_ipv6_group_leave_internal(netif, opt->data);
res = sizeof(ipv6_addr_t);
break;
case NETOPT_MAX_PDU_SIZE:
if (opt->context == GNRC_NETTYPE_IPV6) {
assert(opt->data_len == sizeof(uint16_t));
netif->ipv6.mtu = *((uint16_t *)opt->data);
res = sizeof(uint16_t);
}
/* else set device */
break;
#if IS_ACTIVE(CONFIG_GNRC_IPV6_NIB_ROUTER)
case NETOPT_IPV6_FORWARDING:
assert(opt->data_len == sizeof(netopt_enable_t));
if (*(((netopt_enable_t *)opt->data)) == NETOPT_ENABLE) {
netif->flags |= GNRC_NETIF_FLAGS_IPV6_FORWARDING;
}
else {
if (gnrc_netif_is_rtr_adv(netif)) {
gnrc_ipv6_nib_change_rtr_adv_iface(netif, false);
}
netif->flags &= ~GNRC_NETIF_FLAGS_IPV6_FORWARDING;
}
res = sizeof(netopt_enable_t);
break;
case NETOPT_IPV6_SND_RTR_ADV:
assert(opt->data_len == sizeof(netopt_enable_t));
gnrc_ipv6_nib_change_rtr_adv_iface(netif,
(*(((netopt_enable_t *)opt->data)) == NETOPT_ENABLE));
res = sizeof(netopt_enable_t);
break;
#endif /* CONFIG_GNRC_IPV6_NIB_ROUTER */
#endif /* IS_USED(MODULE_GNRC_NETIF_IPV6) */
#ifdef MODULE_GNRC_SIXLOWPAN_IPHC
case NETOPT_6LO_IPHC:
assert(opt->data_len == sizeof(netopt_enable_t));
if (*(((netopt_enable_t *)opt->data)) == NETOPT_ENABLE) {
netif->flags |= GNRC_NETIF_FLAGS_6LO_HC;
}
else {
netif->flags &= ~GNRC_NETIF_FLAGS_6LO_HC;
}
res = sizeof(netopt_enable_t);
break;
#endif /* MODULE_GNRC_SIXLOWPAN_IPHC */
case NETOPT_RAWMODE:
if (*(((netopt_enable_t *)opt->data)) == NETOPT_ENABLE) {
netif->flags |= GNRC_NETIF_FLAGS_RAWMODE;
}
else {
netif->flags &= ~GNRC_NETIF_FLAGS_RAWMODE;
}
/* Also propagate to the netdev device */
netif->dev->driver->set(netif->dev, NETOPT_RAWMODE, opt->data,
opt->data_len);
res = sizeof(netopt_enable_t);
break;
case NETOPT_STATS:
switch ((int16_t)opt->context) {
#if IS_USED(MODULE_NETSTATS_IPV6) && IS_USED(MODULE_GNRC_NETIF_IPV6)
case NETSTATS_IPV6:
{
/* IPv6 thread is updating this, to prevent data
* corruptions, we have to guarantee mutually exclusive
* access */
unsigned irq_state = irq_disable();
memset(&netif->ipv6.stats, 0, sizeof(netif->ipv6.stats));
irq_restore(irq_state);
res = 0;
}
break;
#endif
#ifdef MODULE_NETSTATS_L2
case NETSTATS_LAYER2:
/* this is only accesses from the netif thread (us), so no need
* to lock this */
memset(&netif->stats, 0, sizeof(netif->stats));
res = 0;
break;
#endif
default:
/* take from device */
break;
}
default:
break;
}
if (res == -ENOTSUP) {
res = netif->dev->driver->set(netif->dev, opt->opt, opt->data,
opt->data_len);
if (res > 0) {
switch (opt->opt) {
case NETOPT_ADDRESS:
case NETOPT_ADDRESS_LONG:
case NETOPT_ADDR_LEN:
case NETOPT_SRC_LEN:
_update_l2addr_from_dev(netif);
break;
case NETOPT_IEEE802154_PHY:
gnrc_netif_ipv6_init_mtu(netif);
break;
default:
break;
}
}
}
gnrc_netif_release(netif);
return res;
}
gnrc_netif_t *gnrc_netif_get_by_pid(kernel_pid_t pid)
{
gnrc_netif_t *netif = NULL;
while ((netif = gnrc_netif_iter(netif))) {
if (netif->pid == pid) {
return netif;
}
}
return NULL;
}
void gnrc_netif_acquire(gnrc_netif_t *netif)
{
if (netif && (netif->ops)) {
rmutex_lock(&netif->mutex);
}
}
void gnrc_netif_release(gnrc_netif_t *netif)
{
if (netif && (netif->ops)) {
rmutex_unlock(&netif->mutex);
}
}
#if IS_USED(MODULE_GNRC_NETIF_IPV6)
static int _addr_idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr);
static int _group_idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr);
static char addr_str[IPV6_ADDR_MAX_STR_LEN];
/**
* @brief Matches an address by prefix to an address on the interface and
* return length of the best match
*
* @param[in] netif the network interface
* @param[in] addr the address to match
*
* @return bits up to which the best match matches @p addr
* @return 0, if no match was found
*
* @pre `netif != NULL` and `addr != NULL`
*/
static unsigned _match_to_len(const gnrc_netif_t *netif,
const ipv6_addr_t *addr);
/**
* @brief Matches an address by prefix to an address on the interface and
* return index of the best match
*
* @param[in] netif the network interface
* @param[in] addr the address to match
*
* @return index of the best match for @p addr
* @return -1 if no match was found
*
* @pre `netif != NULL` and `addr != NULL`
*/
static int _match_to_idx(const gnrc_netif_t *netif,
const ipv6_addr_t *addr);
/**
* @brief Determines the scope of the given address.
*
* @param[in] addr The IPv6 address to check.
*
* @return The scope of the address.
*
* @pre address is not loopback or unspecified.
* see http://tools.ietf.org/html/rfc6724#section-4
*/
static uint8_t _get_scope(const ipv6_addr_t *addr);
static inline unsigned _get_state(const gnrc_netif_t *netif, unsigned idx);
/**
* @brief selects potential source address candidates
* @see <a href="http://tools.ietf.org/html/rfc6724#section-4">
* RFC6724, section 4
* </a>
* @param[in] netif the interface used for sending
* @param[in] dst the destination address
* @param[in] ll_only only consider link-local addresses
* @param[out] candidate_set a bitfield representing all addresses
* configured to @p netif, potential candidates
* will be marked as 1
*
* @return -1 if no candidates were found
* @return the index of the first candidate otherwise
*
* @pre the interface entry and its set of addresses must not be changed during
* runtime of this function
*/
static int _create_candidate_set(const gnrc_netif_t *netif,
const ipv6_addr_t *dst, bool ll_only,
uint8_t *candidate_set);
/** @brief Find the best candidate among the configured addresses
* for a certain destination address according to the 8 rules
* specified in RFC 6734, section 5.
* @see <a href="http://tools.ietf.org/html/rfc6724#section-5">
* RFC6724, section 5
* </a>
*
* @param[in] netif The interface for sending.
* @param[in] dst The destination IPv6 address.
* @param[in, out] candidate_set The preselected set of candidate addresses as
* a bitfield.
*
* @pre @p dst is not unspecified.
*
* @return The best matching candidate found on @p netif, may be NULL if none
* is found.
*/
static ipv6_addr_t *_src_addr_selection(gnrc_netif_t *netif,
const ipv6_addr_t *dst,
uint8_t *candidate_set);
int gnrc_netif_ipv6_addr_add_internal(gnrc_netif_t *netif,
const ipv6_addr_t *addr,
unsigned pfx_len, uint8_t flags)
{
unsigned idx = UINT_MAX;
assert((netif != NULL) && (addr != NULL));
assert(!(ipv6_addr_is_multicast(addr) || ipv6_addr_is_unspecified(addr) ||
ipv6_addr_is_loopback(addr)));
assert((pfx_len > 0) && (pfx_len <= 128));
gnrc_netif_acquire(netif);
if ((flags & GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_MASK) ==
GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_TENTATIVE) {
/* set to first retransmission */
flags &= ~GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_TENTATIVE;
flags |= 0x1;
}
for (unsigned i = 0; i < CONFIG_GNRC_NETIF_IPV6_ADDRS_NUMOF; i++) {
if (ipv6_addr_equal(&netif->ipv6.addrs[i], addr)) {
gnrc_netif_release(netif);
return i;
}
if ((idx == UINT_MAX) && (netif->ipv6.addrs_flags[i] == 0)) {
idx = i;
}
}
if (idx == UINT_MAX) {
gnrc_netif_release(netif);
return -ENOMEM;
}
#if IS_ACTIVE(CONFIG_GNRC_IPV6_NIB_ARSM)
ipv6_addr_t sol_nodes;
int res;
/* TODO: SHOULD delay join between 0 and MAX_RTR_SOLICITATION_DELAY
* for SLAAC */
ipv6_addr_set_solicited_nodes(&sol_nodes, addr);
res = gnrc_netif_ipv6_group_join_internal(netif, &sol_nodes);
if (res < 0) {
DEBUG("gnrc_netif: Can't join solicited-nodes of %s on interface %"
PRIkernel_pid "\n",
ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)),
netif->pid);
gnrc_netif_release(netif);
return res;
}
#else /* CONFIG_GNRC_IPV6_NIB_ARSM */
if (!gnrc_netif_is_6ln(netif)) {
LOG_WARNING("Address-resolution state-machine not activated. Neighbors "
"from interface %u\nwill not be able to resolve address "
"%s\n"
" Use CONFIG_GNRC_IPV6_NIB_ARSM=1 to activate.\n",
netif->pid, ipv6_addr_to_str(addr_str, addr,
sizeof(addr_str)));
}
#endif /* CONFIG_GNRC_IPV6_NIB_ARSM */
netif->ipv6.addrs_flags[idx] = flags;
memcpy(&netif->ipv6.addrs[idx], addr, sizeof(netif->ipv6.addrs[idx]));
#ifdef MODULE_GNRC_IPV6_NIB
if (_get_state(netif, idx) == GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_VALID) {
void *state = NULL;
gnrc_ipv6_nib_pl_t ple;
bool in_pl = false;
while (gnrc_ipv6_nib_pl_iter(netif->pid, &state, &ple)) {
if (ipv6_addr_match_prefix(&ple.pfx, addr) >= pfx_len) {
in_pl = true;
}
}
if (!in_pl) {
gnrc_ipv6_nib_pl_set(netif->pid, addr, pfx_len,
UINT32_MAX, UINT32_MAX);
}
gnrc_netif_ipv6_bus_post(netif, GNRC_IPV6_EVENT_ADDR_VALID, &netif->ipv6.addrs[idx]);
}
else if (IS_USED(MODULE_GNRC_IPV6) &&
IS_ACTIVE(CONFIG_GNRC_IPV6_NIB_SLAAC) &&
!gnrc_netif_is_6ln(netif)) {
/* cast to remove const qualifier (will still be used NIB internally as
* const) */
msg_t msg = { .type = GNRC_IPV6_NIB_DAD,
.content = { .ptr = &netif->ipv6.addrs[idx] } };
msg_send(&msg, gnrc_ipv6_pid);
}
#else
(void)pfx_len;
#endif
gnrc_netif_release(netif);
return idx;
}
void gnrc_netif_ipv6_addr_remove_internal(gnrc_netif_t *netif,
const ipv6_addr_t *addr)
{
bool remove_sol_nodes = true;
ipv6_addr_t sol_nodes;
assert((netif != NULL) && (addr != NULL));
ipv6_addr_set_solicited_nodes(&sol_nodes, addr);
gnrc_netif_acquire(netif);
for (unsigned i = 0; i < CONFIG_GNRC_NETIF_IPV6_ADDRS_NUMOF; i++) {
if (ipv6_addr_equal(&netif->ipv6.addrs[i], addr)) {
netif->ipv6.addrs_flags[i] = 0;
ipv6_addr_set_unspecified(&netif->ipv6.addrs[i]);
}
else {
ipv6_addr_t tmp;
ipv6_addr_set_solicited_nodes(&tmp, &netif->ipv6.addrs[i]);
/* there is still an address on the interface with the same
* solicited nodes address */
if (ipv6_addr_equal(&tmp, &sol_nodes)) {
remove_sol_nodes = false;
}
}
}
if (remove_sol_nodes) {
gnrc_netif_ipv6_group_leave_internal(netif, &sol_nodes);
}
gnrc_netif_release(netif);
}
int gnrc_netif_ipv6_addr_idx(gnrc_netif_t *netif,
const ipv6_addr_t *addr)
{
int idx;
assert((netif != NULL) && (addr != NULL));
DEBUG("gnrc_netif: get index of %s from interface %" PRIkernel_pid "\n",
ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)),
netif->pid);
gnrc_netif_acquire(netif);
idx = _addr_idx(netif, addr);
gnrc_netif_release(netif);
return idx;
}
int gnrc_netif_ipv6_addr_match(gnrc_netif_t *netif,
const ipv6_addr_t *addr)
{
assert((netif != NULL) && (addr != NULL));
gnrc_netif_acquire(netif);
int idx = _match_to_idx(netif, addr);
gnrc_netif_release(netif);
return idx;
}
ipv6_addr_t *gnrc_netif_ipv6_addr_best_src(gnrc_netif_t *netif,
const ipv6_addr_t *dst,
bool ll_only)
{
ipv6_addr_t *best_src = NULL;
BITFIELD(candidate_set, CONFIG_GNRC_NETIF_IPV6_ADDRS_NUMOF);
assert((netif != NULL) && (dst != NULL));
DEBUG("gnrc_netif: get best source address for %s\n",
ipv6_addr_to_str(addr_str, dst, sizeof(addr_str)));
memset(candidate_set, 0, sizeof(candidate_set));
gnrc_netif_acquire(netif);
int first_candidate = _create_candidate_set(netif, dst, ll_only,
candidate_set);
if (first_candidate >= 0) {
best_src = _src_addr_selection(netif, dst, candidate_set);
if (best_src == NULL) {
best_src = &(netif->ipv6.addrs[first_candidate]);
}
}
gnrc_netif_release(netif);
return best_src;
}
gnrc_netif_t *gnrc_netif_get_by_ipv6_addr(const ipv6_addr_t *addr)
{
gnrc_netif_t *netif = NULL;
DEBUG("gnrc_netif: get interface by IPv6 address %s\n",
ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)));
while ((netif = gnrc_netif_iter(netif))) {
if (_addr_idx(netif, addr) >= 0) {
break;
}
if (_group_idx(netif, addr) >= 0) {
break;
}
}
return netif;
}
gnrc_netif_t *gnrc_netif_get_by_prefix(const ipv6_addr_t *prefix)
{
gnrc_netif_t *netif = NULL, *best_netif = NULL;
unsigned best_match = 0;
while ((netif = gnrc_netif_iter(netif))) {
unsigned match;
if (((match = _match_to_len(netif, prefix)) > 0) &&
(match > best_match)) {
best_match = match;
best_netif = netif;
}
}
return best_netif;
}
static int _netif_ops_set_helper(gnrc_netif_t *netif, netopt_t opt,
void *data, uint16_t data_len)
{
gnrc_netapi_opt_t netapi_opt = {
.opt = opt,
.data = data,
.data_len = data_len,
};
return netif->ops->set(netif, &netapi_opt);
}
int gnrc_netif_ipv6_group_join_internal(gnrc_netif_t *netif,
const ipv6_addr_t *addr)
{
uint8_t l2_group_data[GNRC_NETIF_L2ADDR_MAXLEN];
unsigned idx = UINT_MAX;
int l2_group_len;
/* can be called out of lock */
l2_group_len = gnrc_netif_ipv6_group_to_l2_group(netif, addr,
l2_group_data);
gnrc_netif_acquire(netif);
if (l2_group_len > 0) {
int res = _netif_ops_set_helper(netif, NETOPT_L2_GROUP,
l2_group_data, (uint16_t)l2_group_len);
/* link layer does not support multicast, but we can still use
* broadcast */
if ((res != -ENOTSUP) && (res < 0)) {
gnrc_netif_release(netif);
return res;
}
}
/* link layer does not support multicast, but we can still use
* broadcast */
else if (l2_group_len != -ENOTSUP) {
gnrc_netif_release(netif);
return l2_group_len;
}
for (unsigned i = 0; i < GNRC_NETIF_IPV6_GROUPS_NUMOF; i++) {
if (ipv6_addr_equal(&netif->ipv6.groups[i], addr)) {
gnrc_netif_release(netif);
return i;
}
if ((idx == UINT_MAX) &&
(ipv6_addr_is_unspecified(&netif->ipv6.groups[i]))) {
idx = i;
}
}
if (idx == UINT_MAX) {
gnrc_netif_release(netif);
return -ENOMEM;
}
memcpy(&netif->ipv6.groups[idx], addr, sizeof(netif->ipv6.groups[idx]));
/* TODO:
* - MLD action
*/
gnrc_netif_release(netif);
return idx;
}
void gnrc_netif_ipv6_group_leave_internal(gnrc_netif_t *netif,
const ipv6_addr_t *addr)
{
uint8_t l2_group_data[GNRC_NETIF_L2ADDR_MAXLEN];
int idx = -1, l2_group_len;
/* IPv6 addresses that correspond to the same L2 address */
unsigned l2_groups = 0;
assert((netif != NULL) && (addr != NULL));
/* can be called out of lock */
l2_group_len = gnrc_netif_ipv6_group_to_l2_group(netif, addr,
l2_group_data);
/* link layer does not support multicast, but might still have used
* broadcast */
if ((l2_group_len < 0) && (l2_group_len != -ENOTSUP)) {
return;
}
gnrc_netif_acquire(netif);
for (unsigned i = 0; i < GNRC_NETIF_IPV6_GROUPS_NUMOF; i++) {
if (l2_group_len > 0) {
uint8_t tmp[GNRC_NETIF_L2ADDR_MAXLEN];
if (!ipv6_addr_is_unspecified(&netif->ipv6.groups[i]) &&
(gnrc_netif_ipv6_group_to_l2_group(netif,
&netif->ipv6.groups[i],
tmp) == l2_group_len)) {
if (memcmp(tmp, l2_group_data, l2_group_len) == 0) {
l2_groups++;
}
}
}
if (ipv6_addr_equal(&netif->ipv6.groups[i], addr)) {
idx = i;
}
}
if (idx < 0) {
gnrc_netif_release(netif);
return;
}
/* we need to have found at least one corresponding group for the IPv6
* group we want to leave when link layer supports multicast */
assert((l2_group_len == -ENOTSUP) || (l2_groups > 0));
/* we only found exactly IPv6 multicast address that corresponds to
* `l2_group_data`, so we can remove it, if there would be more, we need
* to stay in the group */
if (l2_groups == 1) {
int res = _netif_ops_set_helper(netif, NETOPT_L2_GROUP_LEAVE,
l2_group_data, (uint16_t)l2_group_len);
/* link layer does not support multicast, but might still have used
* broadcast */
if ((res != -ENOTSUP) && (res < 0)) {
DEBUG("gnrc_netif: error leaving link layer group\n");
}
}
if (idx >= 0) {
ipv6_addr_set_unspecified(&netif->ipv6.groups[idx]);
/* TODO:
* - MLD action */
}
gnrc_netif_release(netif);
}
int gnrc_netif_ipv6_group_idx(gnrc_netif_t *netif, const ipv6_addr_t *addr)
{
int idx;
assert((netif != NULL) && (addr != NULL));
gnrc_netif_acquire(netif);
idx = _group_idx(netif, addr);
gnrc_netif_release(netif);
return idx;
}
static int _idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr, bool mcast)
{
if (!ipv6_addr_is_unspecified(addr)) {
const ipv6_addr_t *iplist = (mcast) ? netif->ipv6.groups :
netif->ipv6.addrs;
unsigned ipmax = (mcast) ? GNRC_NETIF_IPV6_GROUPS_NUMOF :
CONFIG_GNRC_NETIF_IPV6_ADDRS_NUMOF;
for (unsigned i = 0; i < ipmax; i++) {
if (ipv6_addr_equal(&iplist[i], addr)) {
return i;
}
}
}
return -1;
}
static inline int _addr_idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr)
{
return _idx(netif, addr, false);
}
static inline int _group_idx(const gnrc_netif_t *netif, const ipv6_addr_t *addr)
{
return _idx(netif, addr, true);
}
static unsigned _match_to_len(const gnrc_netif_t *netif,
const ipv6_addr_t *addr)
{
assert((netif != NULL) && (addr != NULL));
int n = _match_to_idx(netif, addr);
return (n >= 0) ? ipv6_addr_match_prefix(&(netif->ipv6.addrs[n]), addr) : 0;
}
static int _match_to_idx(const gnrc_netif_t *netif,
const ipv6_addr_t *addr)
{
assert((netif != NULL) && (addr != NULL));
int idx = -1;
unsigned best_match = 0;
for (int i = 0; i < CONFIG_GNRC_NETIF_IPV6_ADDRS_NUMOF; i++) {
unsigned match;
if (netif->ipv6.addrs_flags[i] == 0) {
continue;
}
match = ipv6_addr_match_prefix(&(netif->ipv6.addrs[i]), addr);
if (match > best_match) {
idx = i;
best_match = match;
}
}
if (idx != -1) {
DEBUG("gnrc_netif: Found %s on interface %" PRIkernel_pid " matching ",
ipv6_addr_to_str(addr_str, &netif->ipv6.addrs[idx],
sizeof(addr_str)),
netif->pid);
DEBUG("%s by %u bits\n",
ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)),
best_match);
}
else {
DEBUG("gnrc_netif: Did not found any address on interface %"
PRIkernel_pid
" matching %s\n",