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pigweed / third_party / github / zephyrproject-rtos / zephyr / 8d040f1bcbe72bcfd48b652246b3a3937f1a1a49 / . / subsys / net / ip / ipv6.c
blob: eab972a2f2e900c7b9a3bd915af3eb51a22b0e57 [file] [log] [blame]
/** @file
* @brief ICMPv6 related functions
*/
/*
* Copyright (c) 2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#if defined(CONFIG_NET_DEBUG_IPV6)
#define SYS_LOG_DOMAIN "net/ipv6"
#define NET_LOG_ENABLED 1
/* By default this prints too much data, set the value to 1 to see
* neighbor cache contents.
*/
#define NET_DEBUG_NBR 0
#endif
#include <errno.h>
#include <net/net_core.h>
#include <net/net_pkt.h>
#include <net/net_stats.h>
#include <net/net_context.h>
#include <net/net_mgmt.h>
#include "net_private.h"
#include "connection.h"
#include "icmpv6.h"
#include "udp_internal.h"
#include "tcp.h"
#include "ipv6.h"
#include "nbr.h"
#include "6lo.h"
#include "route.h"
#include "rpl.h"
#include "net_stats.h"
/* Timeout value to be used when allocating net buffer during various
* neighbor discovery procedures.
*/
#define ND_NET_BUF_TIMEOUT MSEC(100)
/* IPv6 wildcard and loopback address defined by RFC2553 */
const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
#if defined(CONFIG_NET_IPV6_ND)
static void nd_reachable_timeout(struct k_work *work);
#endif
#if defined(CONFIG_NET_IPV6_NBR_CACHE)
#define MAX_MULTICAST_SOLICIT 3
#define MAX_UNICAST_SOLICIT 3
#define DELAY_FIRST_PROBE_TIME (5 * MSEC_PER_SEC) /* RFC 4861 ch 10 */
#define RETRANS_TIMER 1000 /* in ms, RFC 4861 ch 10 */
extern void net_neighbor_data_remove(struct net_nbr *nbr);
extern void net_neighbor_table_clear(struct net_nbr_table *table);
NET_NBR_POOL_INIT(net_neighbor_pool,
CONFIG_NET_IPV6_MAX_NEIGHBORS,
sizeof(struct net_ipv6_nbr_data),
net_neighbor_data_remove,
0);
NET_NBR_TABLE_INIT(NET_NBR_GLOBAL,
neighbor,
net_neighbor_pool,
net_neighbor_table_clear);
const char *net_ipv6_nbr_state2str(enum net_ipv6_nbr_state state)
{
switch (state) {
case NET_IPV6_NBR_STATE_INCOMPLETE:
return "incomplete";
case NET_IPV6_NBR_STATE_REACHABLE:
return "reachable";
case NET_IPV6_NBR_STATE_STALE:
return "stale";
case NET_IPV6_NBR_STATE_DELAY:
return "delay";
case NET_IPV6_NBR_STATE_PROBE:
return "probe";
case NET_IPV6_NBR_STATE_STATIC:
return "static";
}
return "<invalid state>";
}
static void ipv6_nbr_set_state(struct net_nbr *nbr,
enum net_ipv6_nbr_state new_state)
{
if (new_state == net_ipv6_nbr_data(nbr)->state ||
net_ipv6_nbr_data(nbr)->state == NET_IPV6_NBR_STATE_STATIC) {
return;
}
NET_DBG("nbr %p %s -> %s", nbr,
net_ipv6_nbr_state2str(net_ipv6_nbr_data(nbr)->state),
net_ipv6_nbr_state2str(new_state));
net_ipv6_nbr_data(nbr)->state = new_state;
}
static inline bool net_is_solicited(struct net_pkt *pkt)
{
struct net_icmpv6_na_hdr hdr, *na_hdr;
na_hdr = net_icmpv6_get_na_hdr(pkt, &hdr);
NET_ASSERT(na_hdr);
return na_hdr->flags & NET_ICMPV6_NA_FLAG_SOLICITED;
}
static inline bool net_is_router(struct net_pkt *pkt)
{
struct net_icmpv6_na_hdr hdr, *na_hdr;
na_hdr = net_icmpv6_get_na_hdr(pkt, &hdr);
NET_ASSERT(na_hdr);
return na_hdr->flags & NET_ICMPV6_NA_FLAG_ROUTER;
}
static inline bool net_is_override(struct net_pkt *pkt)
{
struct net_icmpv6_na_hdr hdr, *na_hdr;
na_hdr = net_icmpv6_get_na_hdr(pkt, &hdr);
NET_ASSERT(na_hdr);
return na_hdr->flags & NET_ICMPV6_NA_FLAG_OVERRIDE;
}
static inline struct net_nbr *get_nbr(int idx)
{
return &net_neighbor_pool[idx].nbr;
}
static inline struct net_nbr *get_nbr_from_data(struct net_ipv6_nbr_data *data)
{
int i;
for (i = 0; i < CONFIG_NET_IPV6_MAX_NEIGHBORS; i++) {
struct net_nbr *nbr = get_nbr(i);
if (nbr->data == (u8_t *)data) {
return nbr;
}
}
return NULL;
}
struct iface_cb_data {
net_nbr_cb_t cb;
void *user_data;
};
static void iface_cb(struct net_if *iface, void *user_data)
{
struct iface_cb_data *data = user_data;
int i;
for (i = 0; i < CONFIG_NET_IPV6_MAX_NEIGHBORS; i++) {
struct net_nbr *nbr = get_nbr(i);
if (!nbr->ref || nbr->iface != iface) {
continue;
}
data->cb(nbr, data->user_data);
}
}
void net_ipv6_nbr_foreach(net_nbr_cb_t cb, void *user_data)
{
struct iface_cb_data cb_data = {
.cb = cb,
.user_data = user_data,
};
/* Return the neighbors according to network interface. This makes it
* easier in the callback to use the neighbor information.
*/
net_if_foreach(iface_cb, &cb_data);
}
#if NET_DEBUG_NBR
void nbr_print(void)
{
int i;
for (i = 0; i < CONFIG_NET_IPV6_MAX_NEIGHBORS; i++) {
struct net_nbr *nbr = get_nbr(i);
if (!nbr->ref) {
continue;
}
NET_DBG("[%d] %p %d/%d/%d/%d/%d pending %p iface %p idx %d "
"ll %s addr %s",
i, nbr, nbr->ref, net_ipv6_nbr_data(nbr)->ns_count,
net_ipv6_nbr_data(nbr)->is_router,
net_ipv6_nbr_data(nbr)->state,
net_ipv6_nbr_data(nbr)->link_metric,
net_ipv6_nbr_data(nbr)->pending,
nbr->iface, nbr->idx,
nbr->idx == NET_NBR_LLADDR_UNKNOWN ? "?" :
net_sprint_ll_addr(
net_nbr_get_lladdr(nbr->idx)->addr,
net_nbr_get_lladdr(nbr->idx)->len),
net_sprint_ipv6_addr(&net_ipv6_nbr_data(nbr)->addr));
}
}
#else
#define nbr_print(...)
#endif
static struct net_nbr *nbr_lookup(struct net_nbr_table *table,
struct net_if *iface,
struct in6_addr *addr)
{
int i;
for (i = 0; i < CONFIG_NET_IPV6_MAX_NEIGHBORS; i++) {
struct net_nbr *nbr = get_nbr(i);
if (!nbr->ref) {
continue;
}
if (iface && nbr->iface != iface) {
continue;
}
if (net_ipv6_addr_cmp(&net_ipv6_nbr_data(nbr)->addr, addr)) {
return nbr;
}
}
return NULL;
}
struct net_ipv6_nbr_data *net_ipv6_get_nbr_by_index(u8_t idx)
{
struct net_nbr *nbr = get_nbr(idx);
NET_ASSERT_INFO(nbr, "Invalid ll index %d", idx);
return net_ipv6_nbr_data(nbr);
}
static inline void nbr_clear_ns_pending(struct net_ipv6_nbr_data *data)
{
k_delayed_work_cancel(&data->send_ns);
if (data->pending) {
net_pkt_unref(data->pending);
data->pending = NULL;
}
}
static inline void nbr_free(struct net_nbr *nbr)
{
NET_DBG("nbr %p", nbr);
nbr_clear_ns_pending(net_ipv6_nbr_data(nbr));
k_delayed_work_cancel(&net_ipv6_nbr_data(nbr)->reachable);
net_nbr_unref(nbr);
net_nbr_unlink(nbr, NULL);
}
bool net_ipv6_nbr_rm(struct net_if *iface, struct in6_addr *addr)
{
struct net_nbr *nbr;
#if defined(CONFIG_NET_MGMT_EVENT_INFO)
struct net_event_ipv6_nbr info;
#endif
nbr = nbr_lookup(&net_neighbor.table, iface, addr);
if (!nbr) {
return false;
}
/* Remove any routes with nbr as nexthop in first place */
net_route_del_by_nexthop(iface, addr);
nbr_free(nbr);
#if defined(CONFIG_NET_MGMT_EVENT_INFO)
info.idx = -1;
net_ipaddr_copy(&info.addr, addr);
net_mgmt_event_notify_with_info(NET_EVENT_IPV6_NBR_DEL,
iface, (void *) &info,
sizeof(struct net_event_ipv6_nbr));
#else
net_mgmt_event_notify(NET_EVENT_IPV6_NBR_DEL, iface);
#endif
return true;
}
#define NS_REPLY_TIMEOUT MSEC_PER_SEC
static void ns_reply_timeout(struct k_work *work)
{
/* We did not receive reply to a sent NS */
struct net_ipv6_nbr_data *data = CONTAINER_OF(work,
struct net_ipv6_nbr_data,
send_ns);
struct net_nbr *nbr = get_nbr_from_data(data);
if (!nbr) {
NET_DBG("NS timeout but no nbr data");
return;
}
if (!data->pending) {
/* Silently return, this is not an error as the work
* cannot be cancelled in certain cases.
*/
return;
}
NET_DBG("NS nbr %p pending %p timeout to %s", nbr, data->pending,
net_sprint_ipv6_addr(&NET_IPV6_HDR(data->pending)->dst));
/* To unref when pending variable was set */
net_pkt_unref(data->pending);
/* To unref the original pkt allocation */
net_pkt_unref(data->pending);
data->pending = NULL;
net_nbr_unref(nbr);
}
static void nbr_init(struct net_nbr *nbr, struct net_if *iface,
struct in6_addr *addr, bool is_router,
enum net_ipv6_nbr_state state)
{
nbr->idx = NET_NBR_LLADDR_UNKNOWN;
nbr->iface = iface;
net_ipaddr_copy(&net_ipv6_nbr_data(nbr)->addr, addr);
ipv6_nbr_set_state(nbr, state);
net_ipv6_nbr_data(nbr)->is_router = is_router;
net_ipv6_nbr_data(nbr)->pending = NULL;
#if defined(CONFIG_NET_IPV6_ND)
k_delayed_work_init(&net_ipv6_nbr_data(nbr)->reachable,
nd_reachable_timeout);
#endif
k_delayed_work_init(&net_ipv6_nbr_data(nbr)->send_ns,
ns_reply_timeout);
}
static struct net_nbr *nbr_new(struct net_if *iface,
struct in6_addr *addr, bool is_router,
enum net_ipv6_nbr_state state)
{
struct net_nbr *nbr = net_nbr_get(&net_neighbor.table);
if (!nbr) {
return NULL;
}
nbr_init(nbr, iface, addr, true, state);
NET_DBG("nbr %p iface %p state %d IPv6 %s",
nbr, iface, state, net_sprint_ipv6_addr(addr));
return nbr;
}
#if defined(CONFIG_NET_DEBUG_IPV6)
static inline void dbg_update_neighbor_lladdr(struct net_linkaddr *new_lladdr,
struct net_linkaddr_storage *old_lladdr,
struct in6_addr *addr)
{
char out[sizeof("xx:xx:xx:xx:xx:xx:xx:xx")];
snprintk(out, sizeof(out), "%s",
net_sprint_ll_addr(old_lladdr->addr, old_lladdr->len));
NET_DBG("Updating neighbor %s lladdr %s (was %s)",
net_sprint_ipv6_addr(addr),
net_sprint_ll_addr(new_lladdr->addr, new_lladdr->len),
out);
}
static inline void dbg_update_neighbor_lladdr_raw(u8_t *new_lladdr,
struct net_linkaddr_storage *old_lladdr,
struct in6_addr *addr)
{
struct net_linkaddr lladdr = {
.len = old_lladdr->len,
.addr = new_lladdr,
};
dbg_update_neighbor_lladdr(&lladdr, old_lladdr, addr);
}
#define dbg_addr(action, pkt_str, src, dst) \
do { \
char out[NET_IPV6_ADDR_LEN]; \
\
snprintk(out, sizeof(out), "%s", \
net_sprint_ipv6_addr(dst)); \
\
NET_DBG("%s %s from %s to %s", action, \
pkt_str, net_sprint_ipv6_addr(src), out); \
\
} while (0)
#define dbg_addr_recv(pkt_str, src, dst) \
dbg_addr("Received", pkt_str, src, dst)
#define dbg_addr_sent(pkt_str, src, dst) \
dbg_addr("Sent", pkt_str, src, dst)
#define dbg_addr_with_tgt(action, pkt_str, src, dst, target) \
do { \
char out[NET_IPV6_ADDR_LEN]; \
char tgt[NET_IPV6_ADDR_LEN]; \
\
snprintk(out, sizeof(out), "%s", \
net_sprint_ipv6_addr(dst)); \
snprintk(tgt, sizeof(tgt), "%s", \
net_sprint_ipv6_addr(target)); \
\
NET_DBG("%s %s from %s to %s, target %s", action, \
pkt_str, net_sprint_ipv6_addr(src), out, tgt); \
\
} while (0)
#define dbg_addr_recv_tgt(pkt_str, src, dst, tgt) \
dbg_addr_with_tgt("Received", pkt_str, src, dst, tgt)
#define dbg_addr_sent_tgt(pkt_str, src, dst, tgt) \
dbg_addr_with_tgt("Sent", pkt_str, src, dst, tgt)
#else
#define dbg_update_neighbor_lladdr(...)
#define dbg_update_neighbor_lladdr_raw(...)
#define dbg_addr(...)
#define dbg_addr_recv(...)
#define dbg_addr_sent(...)
#define dbg_addr_with_tgt(...)
#define dbg_addr_recv_tgt(...)
#define dbg_addr_sent_tgt(...)
#endif /* CONFIG_NET_DEBUG_IPV6 */
struct net_nbr *net_ipv6_nbr_add(struct net_if *iface,
struct in6_addr *addr,
struct net_linkaddr *lladdr,
bool is_router,
enum net_ipv6_nbr_state state)
{
struct net_nbr *nbr;
int ret;
#if defined(CONFIG_NET_MGMT_EVENT_INFO)
struct net_event_ipv6_nbr info;
#endif
nbr = nbr_lookup(&net_neighbor.table, iface, addr);
if (!nbr) {
nbr = nbr_new(iface, addr, is_router, state);
if (!nbr) {
NET_ERR("Could not add router neighbor %s [%s]",
net_sprint_ipv6_addr(addr),
net_sprint_ll_addr(lladdr->addr, lladdr->len));
return NULL;
}
}
if (net_nbr_link(nbr, iface, lladdr) == -EALREADY &&
net_ipv6_nbr_data(nbr)->state != NET_IPV6_NBR_STATE_STATIC) {
/* Update the lladdr if the node was already known */
struct net_linkaddr_storage *cached_lladdr;
cached_lladdr = net_nbr_get_lladdr(nbr->idx);
if (memcmp(cached_lladdr->addr, lladdr->addr, lladdr->len)) {
dbg_update_neighbor_lladdr(lladdr, cached_lladdr, addr);
net_linkaddr_set(cached_lladdr, lladdr->addr,
lladdr->len);
ipv6_nbr_set_state(nbr, NET_IPV6_NBR_STATE_STALE);
} else if (net_ipv6_nbr_data(nbr)->state ==
NET_IPV6_NBR_STATE_INCOMPLETE) {
ipv6_nbr_set_state(nbr, NET_IPV6_NBR_STATE_STALE);
}
}
if (net_ipv6_nbr_data(nbr)->state == NET_IPV6_NBR_STATE_INCOMPLETE) {
/* Send NS so that we can verify that the neighbor is
* reachable.
*/
ret = net_ipv6_send_ns(iface, NULL, NULL, NULL, addr, false);
if (ret < 0) {
NET_DBG("Cannot send NS (%d)", ret);
}
}
NET_DBG("[%d] nbr %p state %d router %d IPv6 %s ll %s iface %p",
nbr->idx, nbr, state, is_router,
net_sprint_ipv6_addr(addr),
net_sprint_ll_addr(lladdr->addr, lladdr->len),
nbr->iface);
#if defined(CONFIG_NET_MGMT_EVENT_INFO)
info.idx = nbr->idx;
net_ipaddr_copy(&info.addr, addr);
net_mgmt_event_notify_with_info(NET_EVENT_IPV6_NBR_ADD,
iface, (void *) &info,
sizeof(struct net_event_ipv6_nbr));
#else
net_mgmt_event_notify(NET_EVENT_IPV6_NBR_ADD, iface);
#endif
return nbr;
}
static inline struct net_nbr *nbr_add(struct net_pkt *pkt,
struct net_linkaddr *lladdr,
bool is_router,
enum net_ipv6_nbr_state state)
{
return net_ipv6_nbr_add(net_pkt_iface(pkt), &NET_IPV6_HDR(pkt)->src,
lladdr, is_router, state);
}
void net_neighbor_data_remove(struct net_nbr *nbr)
{
NET_DBG("Neighbor %p removed", nbr);
return;
}
void net_neighbor_table_clear(struct net_nbr_table *table)
{
NET_DBG("Neighbor table %p cleared", table);
}
struct in6_addr *net_ipv6_nbr_lookup_by_index(struct net_if *iface,
u8_t idx)
{
int i;
if (idx == NET_NBR_LLADDR_UNKNOWN) {
return NULL;
}
for (i = 0; i < CONFIG_NET_IPV6_MAX_NEIGHBORS; i++) {
struct net_nbr *nbr = get_nbr(i);
if (!nbr->ref) {
continue;
}
if (iface && nbr->iface != iface) {
continue;
}
if (nbr->idx == idx) {
return &net_ipv6_nbr_data(nbr)->addr;
}
}
return NULL;
}
#endif /* CONFIG_NET_IPV6_NBR_CACHE */
int net_ipv6_find_last_ext_hdr(struct net_pkt *pkt, u16_t *next_hdr_idx,
u16_t *last_hdr_idx)
{
struct net_ipv6_hdr *hdr = NET_IPV6_HDR(pkt);
struct net_buf *frag = pkt->frags;
int pos = 0;
u16_t offset, prev, tmp;
u8_t next_hdr;
u8_t length;
u8_t next;
next = hdr->nexthdr;
/* Initial value if no extension fragments are found */
*next_hdr_idx = 6;
offset = *last_hdr_idx = sizeof(struct net_ipv6_hdr);
/* First check the simplest case where there is no extension headers
* in the packet. There cannot be any extensions after the normal or
* typical IP protocols
*/
if (next == IPPROTO_ICMPV6 || next == IPPROTO_UDP ||
next == IPPROTO_TCP) {
return 0;
}
prev = pos;
while (frag) {
frag = net_frag_read_u8(frag, offset, &offset, &next_hdr);
if (!frag && offset == 0xffff) {
goto fail;
}
frag = net_frag_read_u8(frag, offset, &offset, &length);
if (!frag && offset == 0xffff) {
goto fail;
}
length = length * 8 + 8;
/* TODO: Add here more IPv6 extension headers to check */
switch (next) {
case NET_IPV6_NEXTHDR_NONE:
*next_hdr_idx = prev;
*last_hdr_idx = offset - 2;
goto out;
case NET_IPV6_NEXTHDR_FRAG:
prev = pos;
pos = offset - 2;
offset += 2 + 4;
break;
case NET_IPV6_NEXTHDR_HBHO:
prev = pos;
pos = offset - 2;
offset += length - 2;
break;
case IPPROTO_ICMPV6:
case IPPROTO_UDP:
case IPPROTO_TCP:
prev = pos;
pos = *next_hdr_idx = offset - 2;
goto out;
default:
goto fail;
}
/* Get the next header value */
frag = net_frag_read_u8(frag, pos, &tmp, &next);
if (!frag && pos == 0xffff) {
goto fail;
}
}
out:
*next_hdr_idx = prev;
*last_hdr_idx = offset - 2;
return 0;
fail:
return -EINVAL;
}
const struct in6_addr *net_ipv6_unspecified_address(void)
{
return &in6addr_any;
}
struct net_pkt *net_ipv6_create_raw(struct net_pkt *pkt,
const struct in6_addr *src,
const struct in6_addr *dst,
struct net_if *iface,
u8_t next_header)
{
struct net_buf *header;
header = net_pkt_get_frag(pkt, K_FOREVER);
net_pkt_frag_insert(pkt, header);
NET_IPV6_HDR(pkt)->vtc = 0x60;
NET_IPV6_HDR(pkt)->tcflow = 0;
NET_IPV6_HDR(pkt)->flow = 0;
NET_IPV6_HDR(pkt)->nexthdr = 0;
/* User can tweak the default hop limit if needed */
NET_IPV6_HDR(pkt)->hop_limit = net_pkt_ipv6_hop_limit(pkt);
if (NET_IPV6_HDR(pkt)->hop_limit == 0) {
NET_IPV6_HDR(pkt)->hop_limit =
net_if_ipv6_get_hop_limit(iface);
}
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->dst, dst);
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->src, src);
net_pkt_set_ipv6_ext_len(pkt, 0);
NET_IPV6_HDR(pkt)->nexthdr = next_header;
net_pkt_set_ip_hdr_len(pkt, sizeof(struct net_ipv6_hdr));
net_pkt_set_family(pkt, AF_INET6);
net_buf_add(header, sizeof(struct net_ipv6_hdr));
return pkt;
}
struct net_pkt *net_ipv6_create(struct net_context *context,
struct net_pkt *pkt,
const struct in6_addr *src,
const struct in6_addr *dst)
{
NET_ASSERT(((struct sockaddr_in6_ptr *)&context->local)->sin6_addr);
if (!src) {
src = ((struct sockaddr_in6_ptr *)&context->local)->sin6_addr;
}
if (net_is_ipv6_addr_unspecified(src)
|| net_is_ipv6_addr_mcast(src)) {
src = net_if_ipv6_select_src_addr(net_pkt_iface(pkt),
(struct in6_addr *)dst);
}
return net_ipv6_create_raw(pkt,
src,
dst,
net_context_get_iface(context),
net_context_get_ip_proto(context));
}
int net_ipv6_finalize_raw(struct net_pkt *pkt, u8_t next_header)
{
/* Set the length of the IPv6 header */
size_t total_len;
#if defined(CONFIG_NET_UDP) && defined(CONFIG_NET_RPL_INSERT_HBH_OPTION)
if (next_header != IPPROTO_TCP && next_header != IPPROTO_ICMPV6) {
/* Check if we need to add RPL header to sent UDP packet. */
if (net_rpl_insert_header(pkt) < 0) {
NET_DBG("RPL HBHO insert failed");
return -EINVAL;
}
}
#endif
net_pkt_compact(pkt);
total_len = net_pkt_get_len(pkt);
total_len -= sizeof(struct net_ipv6_hdr);
NET_IPV6_HDR(pkt)->len[0] = total_len >> 8;
NET_IPV6_HDR(pkt)->len[1] = total_len & 0xff;
#if defined(CONFIG_NET_UDP)
if (next_header == IPPROTO_UDP) {
net_udp_set_chksum(pkt, pkt->frags);
} else
#endif
#if defined(CONFIG_NET_TCP)
if (next_header == IPPROTO_TCP) {
net_tcp_set_chksum(pkt, pkt->frags);
} else
#endif
if (next_header == IPPROTO_ICMPV6) {
net_icmpv6_set_chksum(pkt, pkt->frags);
}
return 0;
}
int net_ipv6_finalize(struct net_context *context, struct net_pkt *pkt)
{
return net_ipv6_finalize_raw(pkt, net_context_get_ip_proto(context));
}
#if defined(CONFIG_NET_IPV6_DAD)
int net_ipv6_start_dad(struct net_if *iface, struct net_if_addr *ifaddr)
{
return net_ipv6_send_ns(iface, NULL, NULL, NULL,
&ifaddr->address.in6_addr, true);
}
static inline bool dad_failed(struct net_if *iface, struct in6_addr *addr)
{
if (net_is_ipv6_ll_addr(addr)) {
NET_ERR("DAD failed, no ll IPv6 address!");
return false;
}
net_if_ipv6_dad_failed(iface, addr);
return true;
}
#endif /* CONFIG_NET_IPV6_DAD */
#if defined(CONFIG_NET_IPV6_NBR_CACHE)
/* If the reserve has changed, we need to adjust it accordingly in the
* fragment chain. This can only happen in IEEE 802.15.4 where the link
* layer header size can change if the destination address changes.
* Thus we need to check it here. Note that this cannot happen for IPv4
* as 802.15.4 supports IPv6 only.
*/
static struct net_pkt *update_ll_reserve(struct net_pkt *pkt,
struct in6_addr *addr)
{
/* We need to go through all the fragments and adjust the
* fragment data size.
*/
u16_t reserve, room_len, copy_len, pos;
struct net_buf *orig_frag, *frag;
/* No need to do anything if we are forwarding the packet
* as we already know everything about the destination of
* the packet, but only if both src and dest are using
* same technology meaning that link address length is the same.
*/
if (net_pkt_forwarding(pkt) &&
net_pkt_orig_iface(pkt) == net_pkt_iface(pkt)) {
return pkt;
}
reserve = net_if_get_ll_reserve(net_pkt_iface(pkt), addr);
if (reserve == net_pkt_ll_reserve(pkt)) {
return pkt;
}
NET_DBG("Adjust reserve old %d new %d",
net_pkt_ll_reserve(pkt), reserve);
/* Normally these debug prints are not needed so we do not print them
* always. If your packets get dropped for some reason by L2, then
* you can enable this block to see the IPv6 and LL addresses that
* are used.
*/
if (0) {
NET_DBG("ll src %s",
net_sprint_ll_addr(net_pkt_ll_src(pkt)->addr,
net_pkt_ll_src(pkt)->len));
NET_DBG("ll dst %s",
net_sprint_ll_addr(net_pkt_ll_dst(pkt)->addr,
net_pkt_ll_dst(pkt)->len));
NET_DBG("ip src %s",
net_sprint_ipv6_addr(&NET_IPV6_HDR(pkt)->src));
NET_DBG("ip dst %s",
net_sprint_ipv6_addr(&NET_IPV6_HDR(pkt)->dst));
}
net_pkt_set_ll_reserve(pkt, reserve);
orig_frag = pkt->frags;
copy_len = orig_frag->len;
pos = 0;
pkt->frags = NULL;
room_len = 0;
frag = NULL;
while (orig_frag) {
if (!room_len) {
frag = net_pkt_get_frag(pkt, K_FOREVER);
net_pkt_frag_add(pkt, frag);
room_len = net_buf_tailroom(frag);
}
if (room_len >= copy_len) {
memcpy(net_buf_add(frag, copy_len),
orig_frag->data + pos, copy_len);
room_len -= copy_len;
copy_len = 0;
} else {
memcpy(net_buf_add(frag, room_len),
orig_frag->data + pos, room_len);
copy_len -= room_len;
pos += room_len;
room_len = 0;
}
if (!copy_len) {
struct net_buf *tmp = orig_frag;
orig_frag = orig_frag->frags;
tmp->frags = NULL;
net_pkt_frag_unref(tmp);
if (!orig_frag) {
break;
}
copy_len = orig_frag->len;
pos = 0;
}
}
return pkt;
}
static struct in6_addr *check_route(struct net_if *iface,
struct in6_addr *dst,
bool *try_route)
{
struct in6_addr *nexthop = NULL;
struct net_route_entry *route;
struct net_if_router *router;
route = net_route_lookup(iface, dst);
if (route) {
nexthop = net_route_get_nexthop(route);
NET_DBG("Route %p nexthop %s", route,
nexthop ? net_sprint_ipv6_addr(nexthop) : "<unknown>");
if (!nexthop) {
net_route_del(route);
net_rpl_global_repair(route);
NET_DBG("No route to host %s",
net_sprint_ipv6_addr(dst));
return NULL;
}
} else {
/* No specific route to this host, use the default
* route instead.
*/
router = net_if_ipv6_router_find_default(NULL, dst);
if (!router) {
NET_DBG("No default route to %s",
net_sprint_ipv6_addr(dst));
/* Try to send the packet anyway */
nexthop = dst;
if (try_route) {
*try_route = true;
}
return nexthop;
}
nexthop = &router->address.in6_addr;
NET_DBG("Router %p nexthop %s", router,
net_sprint_ipv6_addr(nexthop));
}
return nexthop;
}
struct net_pkt *net_ipv6_prepare_for_send(struct net_pkt *pkt)
{
struct in6_addr *nexthop = NULL;
struct net_if *iface = NULL;
struct net_nbr *nbr;
int ret;
NET_ASSERT(pkt && pkt->frags);
#if defined(CONFIG_NET_IPV6_FRAGMENT)
/* If we have already fragmented the packet, the fragment id will
* contain a proper value and we can skip other checks.
*/
if (net_pkt_ipv6_fragment_id(pkt) == 0) {
size_t pkt_len = net_pkt_get_len(pkt);
if (pkt_len > NET_IPV6_MTU) {
ret = net_ipv6_send_fragmented_pkt(net_pkt_iface(pkt),
pkt, pkt_len);
if (ret < 0) {
NET_DBG("Cannot fragment IPv6 pkt (%d)", ret);
if (ret == -ENOMEM) {
/* Try to send the packet if we could
* not allocate enough network packets
* and hope the original large packet
* can be sent ok.
*/
goto ignore_frag_error;
}
}
/* We "fake" the sending of the packet here so that
* tcp.c:tcp_retry_expired() will increase the ref
* count when re-sending the packet. This is crucial
* thing to do here and will cause free memory access
* if not done.
*/
net_pkt_set_sent(pkt, true);
/* We need to unref here because we simulate the packet
* sending.
*/
net_pkt_unref(pkt);
/* No need to continue with the sending as the packet
* is now split and its fragments will be sent
* separately to network.
*/
return NULL;
}
}
ignore_frag_error:
#endif /* CONFIG_NET_IPV6_FRAGMENT */
/* Workaround Linux bug, see:
* https://jira.zephyrproject.org/browse/ZEP-1656
*/
if (atomic_test_bit(net_pkt_iface(pkt)->flags, NET_IF_POINTOPOINT)) {
/* Update RPL header */
if (net_rpl_update_header(pkt, &NET_IPV6_HDR(pkt)->dst) < 0) {
net_pkt_unref(pkt);
return NULL;
}
return pkt;
}
/* If the IPv6 destination address is not link local, then try to get
* the next hop from routing table if we have multi interface routing
* enabled. The reason for this is that the neighbor cache will not
* contain public IPv6 address information so in that case we should
* not enter this branch.
*/
if ((net_pkt_ll_dst(pkt)->addr &&
((IS_ENABLED(CONFIG_NET_ROUTING) &&
net_is_ipv6_ll_addr(&NET_IPV6_HDR(pkt)->dst)) ||
!IS_ENABLED(CONFIG_NET_ROUTING))) ||
net_is_ipv6_addr_mcast(&NET_IPV6_HDR(pkt)->dst)) {
/* Update RPL header */
if (net_rpl_update_header(pkt, &NET_IPV6_HDR(pkt)->dst) < 0) {
net_pkt_unref(pkt);
return NULL;
}
return update_ll_reserve(pkt, &NET_IPV6_HDR(pkt)->dst);
}
if (net_if_ipv6_addr_onlink(&iface,
&NET_IPV6_HDR(pkt)->dst)) {
nexthop = &NET_IPV6_HDR(pkt)->dst;
net_pkt_set_iface(pkt, iface);
} else {
/* We need to figure out where the destination
* host is located.
*/
bool try_route = false;
nexthop = check_route(NULL, &NET_IPV6_HDR(pkt)->dst,
&try_route);
if (!nexthop) {
net_pkt_unref(pkt);
return NULL;
}
if (try_route) {
goto try_send;
}
}
if (!iface) {
/* This means that the dst was not onlink, so try to
* figure out the interface using nexthop instead.
*/
if (net_if_ipv6_addr_onlink(&iface, nexthop)) {
net_pkt_set_iface(pkt, iface);
} else {
iface = net_pkt_iface(pkt);
}
/* If the above check returns null, we try to send
* the packet and hope for the best.
*/
}
try_send:
if (net_rpl_update_header(pkt, nexthop) < 0) {
net_pkt_unref(pkt);
return NULL;
}
nbr = nbr_lookup(&net_neighbor.table, iface, nexthop);
NET_DBG("Neighbor lookup %p (%d) iface %p addr %s state %s", nbr,
nbr ? nbr->idx : NET_NBR_LLADDR_UNKNOWN, iface,
net_sprint_ipv6_addr(nexthop),
nbr ? net_ipv6_nbr_state2str(net_ipv6_nbr_data(nbr)->state) :
"-");
if (nbr && nbr->idx != NET_NBR_LLADDR_UNKNOWN) {
struct net_linkaddr_storage *lladdr;
lladdr = net_nbr_get_lladdr(nbr->idx);
net_pkt_ll_dst(pkt)->addr = lladdr->addr;
net_pkt_ll_dst(pkt)->len = lladdr->len;
NET_DBG("Neighbor %p addr %s", nbr,
net_sprint_ll_addr(lladdr->addr, lladdr->len));
/* Start the NUD if we are in STALE state.
* See RFC 4861 ch 7.3.3 for details.
*/
#if defined(CONFIG_NET_IPV6_ND)
if (net_ipv6_nbr_data(nbr)->state == NET_IPV6_NBR_STATE_STALE) {
ipv6_nbr_set_state(nbr, NET_IPV6_NBR_STATE_DELAY);
k_delayed_work_submit(
&net_ipv6_nbr_data(nbr)->reachable,
DELAY_FIRST_PROBE_TIME);
}
#endif
return update_ll_reserve(pkt, nexthop);
}
#if defined(CONFIG_NET_IPV6_ND)
/* We need to send NS and wait for NA before sending the packet. */
ret = net_ipv6_send_ns(net_pkt_iface(pkt), pkt,
&NET_IPV6_HDR(pkt)->src, NULL,
nexthop, false);
if (ret < 0) {
/* In case of an error, the NS send function will unref
* the pkt.
*/
NET_DBG("Cannot send NS (%d)", ret);
return NULL;
}
NET_DBG("pkt %p (frag %p) will be sent later", pkt, pkt->frags);
#else
ARG_UNUSED(ret);
NET_DBG("pkt %p (frag %p) cannot be sent, dropping it.", pkt,
pkt->frags);
net_pkt_unref(pkt);
#endif /* CONFIG_NET_IPV6_ND */
return NULL;
}
struct net_nbr *net_ipv6_nbr_lookup(struct net_if *iface,
struct in6_addr *addr)
{
return nbr_lookup(&net_neighbor.table, iface, addr);
}
struct net_nbr *net_ipv6_get_nbr(struct net_if *iface, u8_t idx)
{
int i;
if (idx == NET_NBR_LLADDR_UNKNOWN) {
return NULL;
}
for (i = 0; i < CONFIG_NET_IPV6_MAX_NEIGHBORS; i++) {
struct net_nbr *nbr = get_nbr(i);
if (nbr->ref) {
if (iface && nbr->iface != iface) {
continue;
}
if (nbr->idx == idx) {
return nbr;
}
}
}
return NULL;
}
static inline u8_t get_llao_len(struct net_if *iface)
{
if (iface->link_addr.len == 6) {
return 8;
} else if (iface->link_addr.len == 8) {
return 16;
}
/* What else could it be? */
NET_ASSERT_INFO(0, "Invalid link address length %d",
iface->link_addr.len);
return 0;
}
static inline void set_llao(struct net_linkaddr *lladdr,
u8_t *llao, u8_t llao_len, u8_t type)
{
llao[NET_ICMPV6_OPT_TYPE_OFFSET] = type;
llao[NET_ICMPV6_OPT_LEN_OFFSET] = llao_len >> 3;
memcpy(&llao[NET_ICMPV6_OPT_DATA_OFFSET], lladdr->addr, lladdr->len);
memset(&llao[NET_ICMPV6_OPT_DATA_OFFSET + lladdr->len], 0,
llao_len - lladdr->len - 2);
}
static void setup_headers(struct net_pkt *pkt, u8_t nd6_len,
u8_t icmp_type)
{
net_buf_add(pkt->frags,
sizeof(struct net_ipv6_hdr) +
sizeof(struct net_icmp_hdr));
NET_IPV6_HDR(pkt)->vtc = 0x60;
NET_IPV6_HDR(pkt)->tcflow = 0;
NET_IPV6_HDR(pkt)->flow = 0;
NET_IPV6_HDR(pkt)->len[0] = 0;
NET_IPV6_HDR(pkt)->len[1] = NET_ICMPH_LEN + nd6_len;
NET_IPV6_HDR(pkt)->nexthdr = IPPROTO_ICMPV6;
NET_IPV6_HDR(pkt)->hop_limit = NET_IPV6_ND_HOP_LIMIT;
/* In this special case where we know there are no long extension
* headers, so we can use this header cast.
*/
net_pkt_icmp_data(pkt)->type = icmp_type;
net_pkt_icmp_data(pkt)->code = 0;
}
static inline void handle_ns_neighbor(struct net_pkt *pkt, u8_t ll_len,
u16_t sllao_offset)
{
struct net_linkaddr_storage lladdr;
struct net_linkaddr nbr_lladdr;
struct net_buf *frag;
u16_t pos;
lladdr.len = 8 * ll_len - 2;
frag = net_frag_read(pkt->frags, sllao_offset,
&pos, lladdr.len, lladdr.addr);
if (!frag && pos == 0xffff) {
return;
}
nbr_lladdr.len = lladdr.len;
nbr_lladdr.addr = lladdr.addr;
/**
* IEEE802154 lladdress is 8 bytes long, so it requires
* 2 * 8 bytes - 2 - padding.
* The formula above needs to be adjusted.
*/
if (net_pkt_ll_src(pkt)->len < nbr_lladdr.len) {
nbr_lladdr.len = net_pkt_ll_src(pkt)->len;
}
nbr_add(pkt, &nbr_lladdr, false, NET_IPV6_NBR_STATE_INCOMPLETE);
}
int net_ipv6_send_na(struct net_if *iface, const struct in6_addr *src,
const struct in6_addr *dst, const struct in6_addr *tgt,
u8_t flags)
{
struct net_icmpv6_na_hdr hdr, *na_hdr;
struct net_pkt *pkt;
struct net_buf *frag;
u8_t llao_len;
pkt = net_pkt_get_reserve_tx(net_if_get_ll_reserve(iface, dst),
ND_NET_BUF_TIMEOUT);
if (!pkt) {
return -ENOMEM;
}
frag = net_pkt_get_frag(pkt, ND_NET_BUF_TIMEOUT);
if (!frag) {
net_pkt_unref(pkt);
return -ENOMEM;
}
net_pkt_frag_add(pkt, frag);
net_pkt_set_iface(pkt, iface);
net_pkt_set_family(pkt, AF_INET6);
net_pkt_set_ip_hdr_len(pkt, sizeof(struct net_ipv6_hdr));
net_pkt_ll_clear(pkt);
llao_len = get_llao_len(iface);
net_pkt_set_ipv6_ext_len(pkt, 0);
setup_headers(pkt, sizeof(struct net_icmpv6_na_hdr) + llao_len,
NET_ICMPV6_NA);
net_buf_add(frag, sizeof(struct net_icmpv6_na_hdr) + llao_len);
na_hdr = net_icmpv6_get_na_hdr(pkt, &hdr);
NET_ASSERT_INFO(na_hdr, "Too short fragment for NA");
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->src, src);
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->dst, dst);
net_ipaddr_copy(&na_hdr->tgt, tgt);
set_llao(&net_pkt_iface(pkt)->link_addr,
(u8_t *)net_pkt_icmp_data(pkt) + sizeof(struct net_icmp_hdr) +
sizeof(struct net_icmpv6_na_hdr),
llao_len, NET_ICMPV6_ND_OPT_TLLAO);
na_hdr->flags = flags;
net_icmpv6_set_na_hdr(pkt, na_hdr);
pkt->frags->len = NET_IPV6ICMPH_LEN +
sizeof(struct net_icmpv6_na_hdr) + llao_len;
net_icmpv6_set_chksum(pkt, pkt->frags);
dbg_addr_sent_tgt("Neighbor Advertisement",
&NET_IPV6_HDR(pkt)->src,
&NET_IPV6_HDR(pkt)->dst,
&na_hdr->tgt);
if (net_send_data(pkt) < 0) {
goto drop;
}
net_stats_update_ipv6_nd_sent();
return 0;
drop:
net_pkt_unref(pkt);
net_stats_update_ipv6_nd_drop();
return -EINVAL;
}
static void ns_routing_info(struct net_pkt *pkt,
struct in6_addr *nexthop,
struct in6_addr *tgt)
{
#if defined(CONFIG_NET_DEBUG_IPV6) && (CONFIG_SYS_LOG_NET_LEVEL > 3)
char out[NET_IPV6_ADDR_LEN];
snprintk(out, sizeof(out), "%s", net_sprint_ipv6_addr(nexthop));
if (net_ipv6_addr_cmp(nexthop, tgt)) {
NET_DBG("Routing to %s iface %p", out, net_pkt_iface(pkt));
} else {
NET_DBG("Routing to %s via %s iface %p",
net_sprint_ipv6_addr(tgt), out, net_pkt_iface(pkt));
}
#endif
}
static enum net_verdict handle_ns_input(struct net_pkt *pkt)
{
u16_t total_len = net_pkt_get_len(pkt);
struct net_icmpv6_nd_opt_hdr ndopthdr, *nd_opt_hdr;
struct net_icmpv6_ns_hdr nshdr, *ns_hdr;
struct net_if_addr *ifaddr;
struct in6_addr *tgt;
const struct in6_addr *src;
u8_t flags = 0, prev_opt_len = 0;
bool routing = false;
int ret;
size_t left_len;
ns_hdr = net_icmpv6_get_ns_hdr(pkt, &nshdr);
if (!ns_hdr) {
NET_ERR("NULL NS header - dropping");
goto drop;
}
dbg_addr_recv_tgt("Neighbor Solicitation",
&NET_IPV6_HDR(pkt)->src,
&NET_IPV6_HDR(pkt)->dst,
&ns_hdr->tgt);
net_stats_update_ipv6_nd_recv();
if ((total_len < (sizeof(struct net_ipv6_hdr) +
sizeof(struct net_icmp_hdr) +
sizeof(struct net_icmpv6_ns_hdr))) ||
(NET_IPV6_HDR(pkt)->hop_limit != NET_IPV6_ND_HOP_LIMIT)) {
if (net_is_ipv6_addr_mcast(&ns_hdr->tgt)) {
struct net_icmp_hdr hdr, *icmp_hdr;
icmp_hdr = net_icmpv6_get_hdr(pkt, &hdr);
if (!icmp_hdr || icmp_hdr->code != 0) {
NET_DBG("Preliminary check failed %u/%zu, "
"code %u, hop %u",
total_len,
(sizeof(struct net_ipv6_hdr) +
sizeof(struct net_icmp_hdr) +
sizeof(struct net_icmpv6_ns_hdr)),
icmp_hdr->code,
NET_IPV6_HDR(pkt)->hop_limit);
goto drop;
}
}
}
net_pkt_set_ipv6_ext_opt_len(pkt, sizeof(struct net_icmpv6_ns_hdr));
nd_opt_hdr = net_icmpv6_get_nd_opt_hdr(pkt, &ndopthdr);
left_len = net_pkt_get_len(pkt) - (sizeof(struct net_ipv6_hdr) +
sizeof(struct net_icmp_hdr));
while (nd_opt_hdr && net_pkt_ipv6_ext_opt_len(pkt) < left_len) {
if (!nd_opt_hdr->len) {
break;
}
switch (nd_opt_hdr->type) {
case NET_ICMPV6_ND_OPT_SLLAO:
if (net_is_ipv6_addr_unspecified(
&NET_IPV6_HDR(pkt)->src)) {
goto drop;
}
if (nd_opt_hdr->len > 2) {
NET_ERR("Too long source link-layer address "
"in NS option");
goto drop;
}
handle_ns_neighbor(pkt, nd_opt_hdr->len,
net_pkt_ip_hdr_len(pkt) +
net_pkt_ipv6_ext_len(pkt) +
sizeof(struct net_icmp_hdr) +
net_pkt_ipv6_ext_opt_len(pkt) +
1 + 1);
break;
default:
NET_DBG("Unknown ND option 0x%x", nd_opt_hdr->type);
break;
}
prev_opt_len = net_pkt_ipv6_ext_opt_len(pkt);
net_pkt_set_ipv6_ext_opt_len(pkt,
net_pkt_ipv6_ext_opt_len(pkt) +
(nd_opt_hdr->len << 3));
if (prev_opt_len >= net_pkt_ipv6_ext_opt_len(pkt)) {
NET_ERR("Corrupted NS message");
goto drop;
}
nd_opt_hdr = net_icmpv6_get_nd_opt_hdr(pkt, &ndopthdr);
}
if (IS_ENABLED(CONFIG_NET_ROUTING)) {
ifaddr = net_if_ipv6_addr_lookup(&ns_hdr->tgt, NULL);
} else {
ifaddr = net_if_ipv6_addr_lookup_by_iface(net_pkt_iface(pkt),
&ns_hdr->tgt);
}
if (!ifaddr) {
if (IS_ENABLED(CONFIG_NET_ROUTING)) {
struct in6_addr *nexthop;
nexthop = check_route(NULL, &ns_hdr->tgt, NULL);
if (nexthop) {
ns_routing_info(pkt, nexthop, &ns_hdr->tgt);
/* Note that the target is not the address of
* the "nethop" as that is a link-local address
* which is not routable.
*/
tgt = &ns_hdr->tgt;
/* Source address must be one of our real
* interface address where the packet was
* received.
*/
src = net_if_ipv6_select_src_addr(
net_pkt_iface(pkt),
&NET_IPV6_HDR(pkt)->src);
if (!src) {
NET_DBG("No interface address for "
"dst %s iface %p",
net_sprint_ipv6_addr(
&NET_IPV6_HDR(pkt)->src),
net_pkt_iface(pkt));
goto drop;
}
routing = true;
goto nexthop_found;
}
}
NET_DBG("No such interface address %s",
net_sprint_ipv6_addr(&ns_hdr->tgt));
goto drop;
} else {
tgt = &ifaddr->address.in6_addr;
/* As we swap the addresses later, the source will correctly
* have our address.
*/
src = &NET_IPV6_HDR(pkt)->src;
}
nexthop_found:
#if !defined(CONFIG_NET_IPV6_DAD)
if (net_is_ipv6_addr_unspecified(&NET_IPV6_HDR(pkt)->src)) {
goto drop;
}
#else /* CONFIG_NET_IPV6_DAD */
/* Do DAD */
if (net_is_ipv6_addr_unspecified(&NET_IPV6_HDR(pkt)->src)) {
if (!net_is_ipv6_addr_solicited_node(&NET_IPV6_HDR(pkt)->dst)) {
NET_DBG("Not solicited node addr %s",
net_sprint_ipv6_addr(&NET_IPV6_HDR(pkt)->dst));
goto drop;
}
if (ifaddr->addr_state == NET_ADDR_TENTATIVE) {
NET_DBG("DAD failed for %s iface %p",
net_sprint_ipv6_addr(&ifaddr->address.in6_addr),
net_pkt_iface(pkt));
dad_failed(net_pkt_iface(pkt),
&ifaddr->address.in6_addr);
goto drop;
}
/* We reuse the received packet to send the NA */
net_ipv6_addr_create_ll_allnodes_mcast(&NET_IPV6_HDR(pkt)->dst);
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->src,
net_if_ipv6_select_src_addr(net_pkt_iface(pkt),
&NET_IPV6_HDR(pkt)->dst));
flags = NET_ICMPV6_NA_FLAG_OVERRIDE;
goto send_na;
}
#endif /* CONFIG_NET_IPV6_DAD */
if (net_is_my_ipv6_addr(&NET_IPV6_HDR(pkt)->src)) {
NET_DBG("Duplicate IPv6 %s address",
net_sprint_ipv6_addr(&NET_IPV6_HDR(pkt)->src));
goto drop;
}
/* Address resolution */
if (net_is_ipv6_addr_solicited_node(&NET_IPV6_HDR(pkt)->dst)) {
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->dst,
&NET_IPV6_HDR(pkt)->src);
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->src, &ns_hdr->tgt);
flags = NET_ICMPV6_NA_FLAG_SOLICITED |
NET_ICMPV6_NA_FLAG_OVERRIDE;
goto send_na;
}
if (routing) {
/* No need to do NUD here when the target is being routed. */
goto send_na;
}
/* Neighbor Unreachability Detection (NUD) */
if (IS_ENABLED(CONFIG_NET_ROUTING)) {
ifaddr = net_if_ipv6_addr_lookup(&NET_IPV6_HDR(pkt)->dst,
NULL);
} else {
ifaddr = net_if_ipv6_addr_lookup_by_iface(net_pkt_iface(pkt),
&NET_IPV6_HDR(pkt)->dst);
}
if (ifaddr) {
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->dst,
&NET_IPV6_HDR(pkt)->src);
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->src, &ns_hdr->tgt);
src = &NET_IPV6_HDR(pkt)->src;
tgt = &ifaddr->address.in6_addr;
flags = NET_ICMPV6_NA_FLAG_SOLICITED |
NET_ICMPV6_NA_FLAG_OVERRIDE;
goto send_na;
} else {
NET_DBG("NUD failed");
goto drop;
}
send_na:
ret = net_ipv6_send_na(net_pkt_iface(pkt),
src,
&NET_IPV6_HDR(pkt)->dst,
tgt,
flags);
if (!ret) {
NET_DBG("Cannot send NA (%d)", ret);
net_pkt_unref(pkt);
return NET_OK;
}
return NET_DROP;
drop:
net_stats_update_ipv6_nd_drop();
return NET_DROP;
}
#endif /* CONFIG_NET_IPV6_NBR_CACHE */
#if defined(CONFIG_NET_IPV6_ND)
static void nd_reachable_timeout(struct k_work *work)
{
struct net_ipv6_nbr_data *data = CONTAINER_OF(work,
struct net_ipv6_nbr_data,
reachable);
struct net_nbr *nbr = get_nbr_from_data(data);
int ret;
if (!data || !nbr) {
NET_DBG("ND reachable timeout but no nbr data "
"(nbr %p data %p)", nbr, data);
return;
}
if (net_rpl_get_interface() && nbr->iface == net_rpl_get_interface()) {
/* The address belongs to RPL network, no need to activate
* full neighbor reachable rules in this case.
* Mark the neighbor always reachable.
*/
data->state = NET_IPV6_NBR_STATE_REACHABLE;
return;
}
switch (data->state) {
case NET_IPV6_NBR_STATE_STATIC:
NET_ASSERT_INFO(false, "Static entry shall never timeout");
break;
case NET_IPV6_NBR_STATE_INCOMPLETE:
if (data->ns_count >= MAX_MULTICAST_SOLICIT) {
nbr_free(nbr);
} else {
data->ns_count++;
NET_DBG("nbr %p incomplete count %u", nbr,
data->ns_count);
ret = net_ipv6_send_ns(nbr->iface, NULL, NULL, NULL,
&data->addr, false);
if (ret < 0) {
NET_DBG("Cannot send NS (%d)", ret);
}
}
break;
case NET_IPV6_NBR_STATE_REACHABLE:
data->state = NET_IPV6_NBR_STATE_STALE;
NET_DBG("nbr %p moving %s state to STALE (%d)",
nbr, net_sprint_ipv6_addr(&data->addr), data->state);
break;
case NET_IPV6_NBR_STATE_STALE:
NET_DBG("nbr %p removing stale address %s",
nbr, net_sprint_ipv6_addr(&data->addr));
nbr_free(nbr);
break;
case NET_IPV6_NBR_STATE_DELAY:
data->state = NET_IPV6_NBR_STATE_PROBE;
data->ns_count = 0;
NET_DBG("nbr %p moving %s state to PROBE (%d)",
nbr, net_sprint_ipv6_addr(&data->addr), data->state);
/* Intentionally continuing to probe state */
case NET_IPV6_NBR_STATE_PROBE:
if (data->ns_count >= MAX_UNICAST_SOLICIT) {
struct net_if_router *router;
router = net_if_ipv6_router_lookup(nbr->iface,
&data->addr);
if (router && !router->is_infinite) {
NET_DBG("nbr %p address %s PROBE ended (%d)",
nbr, net_sprint_ipv6_addr(&data->addr),
data->state);
net_if_ipv6_router_rm(router);
nbr_free(nbr);
}
} else {
data->ns_count++;
NET_DBG("nbr %p probe count %u", nbr,
data->ns_count);
ret = net_ipv6_send_ns(nbr->iface, NULL, NULL, NULL,
&data->addr, false);
if (ret < 0) {
NET_DBG("Cannot send NS (%d)", ret);
}
k_delayed_work_submit(
&net_ipv6_nbr_data(nbr)->reachable,
RETRANS_TIMER);
}
break;
}
}
void net_ipv6_nbr_set_reachable_timer(struct net_if *iface, struct net_nbr *nbr)
{
u32_t time;
time = net_if_ipv6_get_reachable_time(iface);
NET_ASSERT_INFO(time, "Zero reachable timeout!");
NET_DBG("Starting reachable timer nbr %p data %p time %d ms",
nbr, net_ipv6_nbr_data(nbr), time);
k_delayed_work_submit(&net_ipv6_nbr_data(nbr)->reachable, time);
}
#endif /* CONFIG_NET_IPV6_ND */
#if defined(CONFIG_NET_IPV6_NBR_CACHE)
static inline bool handle_na_neighbor(struct net_pkt *pkt,
struct net_icmpv6_na_hdr *na_hdr,
u16_t tllao_offset)
{
bool lladdr_changed = false;
struct net_nbr *nbr;
struct net_linkaddr_storage lladdr = { 0 };
struct net_linkaddr_storage *cached_lladdr;
struct net_pkt *pending;
struct net_buf *frag;
u16_t pos;
nbr = nbr_lookup(&net_neighbor.table, net_pkt_iface(pkt),
&na_hdr->tgt);
NET_DBG("Neighbor lookup %p iface %p addr %s", nbr,
net_pkt_iface(pkt),
net_sprint_ipv6_addr(&na_hdr->tgt));
if (!nbr) {
nbr_print();
NET_DBG("No such neighbor found, msg discarded");
return false;
}
if (tllao_offset) {
lladdr.len = net_pkt_iface(pkt)->link_addr.len;
frag = net_frag_read(pkt->frags, tllao_offset,
&pos, lladdr.len, lladdr.addr);
if (!frag && pos == 0xffff) {
return false;
}
}
if (nbr->idx == NET_NBR_LLADDR_UNKNOWN) {
struct net_linkaddr nbr_lladdr;
if (!tllao_offset) {
NET_DBG("No target link layer address.");
return false;
}
nbr_lladdr.len = lladdr.len;
nbr_lladdr.addr = lladdr.addr;
if (net_nbr_link(nbr, net_pkt_iface(pkt), &nbr_lladdr)) {
nbr_free(nbr);
return false;
}
NET_DBG("[%d] nbr %p state %d IPv6 %s ll %s",
nbr->idx, nbr, net_ipv6_nbr_data(nbr)->state,
net_sprint_ipv6_addr(&na_hdr->tgt),
net_sprint_ll_addr(nbr_lladdr.addr, nbr_lladdr.len));
}
cached_lladdr = net_nbr_get_lladdr(nbr->idx);
if (!cached_lladdr) {
NET_DBG("No lladdr but index defined");
return false;
}
if (tllao_offset) {
lladdr_changed = memcmp(lladdr.addr,
cached_lladdr->addr,
cached_lladdr->len);
}
/* Update the cached address if we do not yet known it */
if (net_ipv6_nbr_data(nbr)->state == NET_IPV6_NBR_STATE_INCOMPLETE) {
if (!tllao_offset) {
return false;
}
if (lladdr_changed) {
dbg_update_neighbor_lladdr_raw(lladdr.addr,
cached_lladdr,
&na_hdr->tgt);
net_linkaddr_set(cached_lladdr, lladdr.addr,
cached_lladdr->len);
}
if (net_is_solicited(pkt)) {
ipv6_nbr_set_state(nbr, NET_IPV6_NBR_STATE_REACHABLE);
net_ipv6_nbr_data(nbr)->ns_count = 0;
/* We might have active timer from PROBE */
k_delayed_work_cancel(
&net_ipv6_nbr_data(nbr)->reachable);
net_ipv6_nbr_set_reachable_timer(net_pkt_iface(pkt),
nbr);
} else {
ipv6_nbr_set_state(nbr, NET_IPV6_NBR_STATE_STALE);
}
net_ipv6_nbr_data(nbr)->is_router = net_is_router(pkt);
goto send_pending;
}
/* We do not update the address if override bit is not set
* and we have a valid address in the cache.
*/
if (!net_is_override(pkt) && lladdr_changed) {
if (net_ipv6_nbr_data(nbr)->state ==
NET_IPV6_NBR_STATE_REACHABLE) {
ipv6_nbr_set_state(nbr, NET_IPV6_NBR_STATE_STALE);
}
return false;
}
if (net_is_override(pkt) ||
(!net_is_override(pkt) && tllao_offset && !lladdr_changed)) {
if (lladdr_changed) {
dbg_update_neighbor_lladdr_raw(
lladdr.addr, cached_lladdr, &na_hdr->tgt);
net_linkaddr_set(cached_lladdr, lladdr.addr,
cached_lladdr->len);
}
if (net_is_solicited(pkt)) {
ipv6_nbr_set_state(nbr, NET_IPV6_NBR_STATE_REACHABLE);
/* We might have active timer from PROBE */
k_delayed_work_cancel(
&net_ipv6_nbr_data(nbr)->reachable);
net_ipv6_nbr_set_reachable_timer(net_pkt_iface(pkt),
nbr);
} else {
if (lladdr_changed) {
ipv6_nbr_set_state(nbr,
NET_IPV6_NBR_STATE_STALE);
}
}
}
if (net_ipv6_nbr_data(nbr)->is_router && !net_is_router(pkt)) {
/* Update the routing if the peer is no longer
* a router.
*/
/* FIXME */
}
net_ipv6_nbr_data(nbr)->is_router = net_is_router(pkt);
send_pending:
/* Next send any pending messages to the peer. */
pending = net_ipv6_nbr_data(nbr)->pending;
if (pending) {
NET_DBG("Sending pending %p to %s lladdr %s", pending,
net_sprint_ipv6_addr(&NET_IPV6_HDR(pending)->dst),
net_sprint_ll_addr(cached_lladdr->addr,
cached_lladdr->len));
if (net_send_data(pending) < 0) {
nbr_clear_ns_pending(net_ipv6_nbr_data(nbr));
} else {
net_ipv6_nbr_data(nbr)->pending = NULL;
}
net_pkt_unref(pending);
}
return true;
}
static enum net_verdict handle_na_input(struct net_pkt *pkt)
{
u16_t total_len = net_pkt_get_len(pkt);
u16_t tllao_offset = 0;
u8_t prev_opt_len = 0;
struct net_icmpv6_nd_opt_hdr ndopthdr, *nd_opt_hdr;
struct net_icmpv6_na_hdr nahdr, *na_hdr;
struct net_if_addr *ifaddr;
size_t left_len;
na_hdr = net_icmpv6_get_na_hdr(pkt, &nahdr);
NET_ASSERT(na_hdr);
dbg_addr_recv_tgt("Neighbor Advertisement",
&NET_IPV6_HDR(pkt)->src,
&NET_IPV6_HDR(pkt)->dst,
&na_hdr->tgt);
net_stats_update_ipv6_nd_recv();
if ((total_len < (sizeof(struct net_ipv6_hdr) +
sizeof(struct net_icmp_hdr) +
sizeof(struct net_icmpv6_na_hdr) +
sizeof(struct net_icmpv6_nd_opt_hdr))) ||
(NET_IPV6_HDR(pkt)->hop_limit != NET_IPV6_ND_HOP_LIMIT) ||
net_is_ipv6_addr_mcast(&na_hdr->tgt) ||
(net_is_solicited(pkt) &&
net_is_ipv6_addr_mcast(&NET_IPV6_HDR(pkt)->dst))) {
struct net_icmp_hdr hdr, *icmp_hdr;
icmp_hdr = net_icmpv6_get_hdr(pkt, &hdr);
if (!icmp_hdr || icmp_hdr->code != 0) {
goto drop;
}
}
net_pkt_set_ipv6_ext_opt_len(pkt, sizeof(struct net_icmpv6_na_hdr));
nd_opt_hdr = net_icmpv6_get_nd_opt_hdr(pkt, &ndopthdr);
left_len = net_pkt_get_len(pkt) - (sizeof(struct net_ipv6_hdr) +
sizeof(struct net_icmp_hdr));
while (nd_opt_hdr && net_pkt_ipv6_ext_opt_len(pkt) < left_len) {
if (!nd_opt_hdr->len) {
break;
}
switch (nd_opt_hdr->type) {
case NET_ICMPV6_ND_OPT_TLLAO:
tllao_offset = net_pkt_ip_hdr_len(pkt) +
net_pkt_ipv6_ext_len(pkt) +
sizeof(struct net_icmp_hdr) +
net_pkt_ipv6_ext_opt_len(pkt) + 1 + 1;
break;
default:
NET_DBG("Unknown ND option 0x%x", nd_opt_hdr->type);
break;
}
prev_opt_len = net_pkt_ipv6_ext_opt_len(pkt);
net_pkt_set_ipv6_ext_opt_len(pkt,
net_pkt_ipv6_ext_opt_len(pkt) +
(nd_opt_hdr->len << 3));
if (prev_opt_len >= net_pkt_ipv6_ext_opt_len(pkt)) {
NET_ERR("Corrupted NA message");
goto drop;
}
nd_opt_hdr = net_icmpv6_get_nd_opt_hdr(pkt, &ndopthdr);
}
ifaddr = net_if_ipv6_addr_lookup_by_iface(net_pkt_iface(pkt),
&na_hdr->tgt);
if (ifaddr) {
NET_DBG("Interface %p already has address %s",
net_pkt_iface(pkt),
net_sprint_ipv6_addr(&na_hdr->tgt));
#if defined(CONFIG_NET_IPV6_DAD)
if (ifaddr->addr_state == NET_ADDR_TENTATIVE) {
dad_failed(net_pkt_iface(pkt), &na_hdr->tgt);
}
#endif /* CONFIG_NET_IPV6_DAD */
goto drop;
}
if (!handle_na_neighbor(pkt, na_hdr, tllao_offset)) {
goto drop;
}
net_pkt_unref(pkt);
net_stats_update_ipv6_nd_sent();
return NET_OK;
drop:
net_stats_update_ipv6_nd_drop();
return NET_DROP;
}
int net_ipv6_send_ns(struct net_if *iface,
struct net_pkt *pending,
struct in6_addr *src,
struct in6_addr *dst,
struct in6_addr *tgt,
bool is_my_address)
{
struct net_icmpv6_ns_hdr hdr, *ns_hdr;
struct net_pkt *pkt;
struct net_buf *frag;
struct net_nbr *nbr;
u8_t llao_len;
pkt = net_pkt_get_reserve_tx(net_if_get_ll_reserve(iface, dst),
ND_NET_BUF_TIMEOUT);
if (!pkt) {
return -ENOMEM;
}
frag = net_pkt_get_frag(pkt, ND_NET_BUF_TIMEOUT);
if (!frag) {
net_pkt_unref(pkt);
return -ENOMEM;
}
net_pkt_frag_add(pkt, frag);
net_pkt_set_iface(pkt, iface);
net_pkt_set_family(pkt, AF_INET6);
net_pkt_set_ip_hdr_len(pkt, sizeof(struct net_ipv6_hdr));
net_pkt_set_ipv6_ext_len(pkt, 0);
net_pkt_ll_clear(pkt);
llao_len = get_llao_len(net_pkt_iface(pkt));
setup_headers(pkt, sizeof(struct net_icmpv6_ns_hdr) + llao_len,
NET_ICMPV6_NS);
net_buf_add(frag, sizeof(struct net_icmpv6_ns_hdr));
ns_hdr = net_icmpv6_get_ns_hdr(pkt, &hdr);
NET_ASSERT(ns_hdr);
if (!dst) {
net_ipv6_addr_create_solicited_node(tgt,
&NET_IPV6_HDR(pkt)->dst);
} else {
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->dst, dst);
}
net_ipaddr_copy(&ns_hdr->tgt, tgt);
net_icmpv6_set_ns_hdr(pkt, ns_hdr);
if (is_my_address) {
/* DAD */
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->src,
net_ipv6_unspecified_address());
NET_IPV6_HDR(pkt)->len[1] -= llao_len;
} else {
if (src) {
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->src, src);
} else {
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->src,
net_if_ipv6_select_src_addr(
net_pkt_iface(pkt),
&NET_IPV6_HDR(pkt)->dst));
}
if (net_is_ipv6_addr_unspecified(&NET_IPV6_HDR(pkt)->src)) {
NET_DBG("No source address for NS");
goto drop;
}
net_buf_add(frag, llao_len);
set_llao(&net_pkt_iface(pkt)->link_addr,
(u8_t *)net_pkt_icmp_data(pkt) +
sizeof(struct net_icmp_hdr) +
sizeof(struct net_icmpv6_ns_hdr),
llao_len, NET_ICMPV6_ND_OPT_SLLAO);
}
net_icmpv6_set_chksum(pkt, pkt->frags);
nbr = nbr_lookup(&net_neighbor.table, net_pkt_iface(pkt), &ns_hdr->tgt);
if (!nbr) {
nbr_print();
nbr = nbr_new(net_pkt_iface(pkt), &ns_hdr->tgt, false,
NET_IPV6_NBR_STATE_INCOMPLETE);
if (!nbr) {
NET_DBG("Could not create new neighbor %s",
net_sprint_ipv6_addr(&ns_hdr->tgt));
goto drop;
}
}
if (pending) {
if (!net_ipv6_nbr_data(nbr)->pending) {
net_ipv6_nbr_data(nbr)->pending = net_pkt_ref(pending);
} else {
NET_DBG("Packet %p already pending for "
"operation. Discarding pending %p and pkt %p",
net_ipv6_nbr_data(nbr)->pending, pending, pkt);
net_pkt_unref(pending);
goto drop;
}
NET_DBG("Setting timeout %d for NS", NS_REPLY_TIMEOUT);
k_delayed_work_submit(&net_ipv6_nbr_data(nbr)->send_ns,
NS_REPLY_TIMEOUT);
}
dbg_addr_sent_tgt("Neighbor Solicitation",
&NET_IPV6_HDR(pkt)->src,
&NET_IPV6_HDR(pkt)->dst,
&ns_hdr->tgt);
if (net_send_data(pkt) < 0) {
NET_DBG("Cannot send NS %p (pending %p)", pkt, pending);
if (pending) {
nbr_clear_ns_pending(net_ipv6_nbr_data(nbr));
}
goto drop;
}
net_stats_update_ipv6_nd_sent();
return 0;
drop:
net_pkt_unref(pkt);
net_stats_update_ipv6_nd_drop();
return -EINVAL;
}
#endif /* CONFIG_NET_IPV6_NBR_CACHE */
#if defined(CONFIG_NET_IPV6_ND)
int net_ipv6_send_rs(struct net_if *iface)
{
struct net_pkt *pkt;
struct net_buf *frag;
bool unspec_src;
u8_t llao_len = 0;
pkt = net_pkt_get_reserve_tx(net_if_get_ll_reserve(iface, NULL),
ND_NET_BUF_TIMEOUT);
if (!pkt) {
return -ENOMEM;
}
frag = net_pkt_get_frag(pkt, ND_NET_BUF_TIMEOUT);
if (!frag) {
net_pkt_unref(pkt);
return -ENOMEM;
}
net_pkt_frag_add(pkt, frag);
net_pkt_set_iface(pkt, iface);
net_pkt_set_family(pkt, AF_INET6);
net_pkt_set_ip_hdr_len(pkt, sizeof(struct net_ipv6_hdr));
net_pkt_ll_clear(pkt);
net_ipv6_addr_create_ll_allnodes_mcast(&NET_IPV6_HDR(pkt)->dst);
net_ipaddr_copy(&NET_IPV6_HDR(pkt)->src,
net_if_ipv6_select_src_addr(iface,
&NET_IPV6_HDR(pkt)->dst));
unspec_src = net_is_ipv6_addr_unspecified(&NET_IPV6_HDR(pkt)->src);
if (!unspec_src) {
llao_len = get_llao_len(net_pkt_iface(pkt));
}
setup_headers(pkt, sizeof(struct net_icmpv6_rs_hdr) + llao_len,
NET_ICMPV6_RS);
net_buf_add(frag, sizeof(struct net_icmpv6_rs_hdr));
if (!unspec_src) {
net_buf_add(frag, llao_len);
set_llao(&net_pkt_iface(pkt)->link_addr,
(u8_t *)net_pkt_icmp_data(pkt) +
sizeof(struct net_icmp_hdr) +
sizeof(struct net_icmpv6_rs_hdr),
llao_len, NET_ICMPV6_ND_OPT_SLLAO);
}
net_icmpv6_set_chksum(pkt, pkt->frags);
dbg_addr_sent("Router Solicitation",
&NET_IPV6_HDR(pkt)->src,
&NET_IPV6_HDR(pkt)->dst);
if (net_send_data(pkt) < 0) {
goto drop;
}
net_stats_update_ipv6_nd_sent();
return 0;
drop:
net_pkt_unref(pkt);
net_stats_update_ipv6_nd_drop();
return -EINVAL;
}
int net_ipv6_start_rs(struct net_if *iface)
{
return net_ipv6_send_rs(iface);
}
static inline struct net_buf *handle_ra_neighbor(struct net_pkt *pkt,
struct net_buf *frag,
u8_t len,
u16_t offset, u16_t *pos,
struct net_nbr **nbr)
{
struct net_linkaddr lladdr;
struct net_linkaddr_storage llstorage;
u8_t padding;
if (!nbr) {
return NULL;
}
llstorage.len = NET_LINK_ADDR_MAX_LENGTH;
lladdr.len = NET_LINK_ADDR_MAX_LENGTH;
lladdr.addr = llstorage.addr;
if (net_pkt_ll_src(pkt)->len < lladdr.len) {
lladdr.len = net_pkt_ll_src(pkt)->len;
}
frag = net_frag_read(frag, offset, pos, lladdr.len, lladdr.addr);
if (!frag && offset) {
return NULL;
}
padding = len * 8 - 2 - lladdr.len;
if (padding) {
frag = net_frag_read(frag, *pos, pos, padding, NULL);
if (!frag && *pos) {
return NULL;
}
}
*nbr = nbr_add(pkt, &lladdr, true, NET_IPV6_NBR_STATE_STALE);
return frag;
}
static inline void handle_prefix_onlink(struct net_pkt *pkt,
struct net_icmpv6_nd_opt_prefix_info *prefix_info)
{
struct net_if_ipv6_prefix *prefix;
prefix = net_if_ipv6_prefix_lookup(net_pkt_iface(pkt),
&prefix_info->prefix,
prefix_info->prefix_len);
if (!prefix) {
if (!prefix_info->valid_lifetime) {
return;
}
prefix = net_if_ipv6_prefix_add(net_pkt_iface(pkt),
&prefix_info->prefix,
prefix_info->prefix_len,
prefix_info->valid_lifetime);
if (prefix) {
NET_DBG("Interface %p add prefix %s/%d lifetime %u",
net_pkt_iface(pkt),
net_sprint_ipv6_addr(&prefix_info->prefix),
prefix_info->prefix_len,
prefix_info->valid_lifetime);
} else {
NET_ERR("Prefix %s/%d could not be added to iface %p",
net_sprint_ipv6_addr(&prefix_info->prefix),
prefix_info->prefix_len,
net_pkt_iface(pkt));
return;
}
}
switch (prefix_info->valid_lifetime) {
case 0:
NET_DBG("Interface %p delete prefix %s/%d",
net_pkt_iface(pkt),
net_sprint_ipv6_addr(&prefix_info->prefix),
prefix_info->prefix_len);
net_if_ipv6_prefix_rm(net_pkt_iface(pkt),
&prefix->prefix,
prefix->len);
break;
case NET_IPV6_ND_INFINITE_LIFETIME:
NET_DBG("Interface %p prefix %s/%d infinite",
net_pkt_iface(pkt),
net_sprint_ipv6_addr(&prefix->prefix),
prefix->len);
net_if_ipv6_prefix_set_lf(prefix, true);
break;
default:
NET_DBG("Interface %p update prefix %s/%u lifetime %u",
net_pkt_iface(pkt),
net_sprint_ipv6_addr(&prefix_info->prefix),
prefix_info->prefix_len,
prefix_info->valid_lifetime);
net_if_ipv6_prefix_set_lf(prefix, false);
net_if_ipv6_prefix_set_timer(prefix,
prefix_info->valid_lifetime);
break;
}
}
#define TWO_HOURS (2 * 60 * 60)
static inline u32_t remaining(struct k_delayed_work *work)
{
return k_delayed_work_remaining_get(work) / MSEC_PER_SEC;
}
static inline void handle_prefix_autonomous(struct net_pkt *pkt,
struct net_icmpv6_nd_opt_prefix_info *prefix_info)
{
struct in6_addr addr = { };
struct net_if_addr *ifaddr;
/* Create IPv6 address using the given prefix and iid. We first
* setup link local address, and then copy prefix over first 8
* bytes of that address.
*/
net_ipv6_addr_create_iid(&addr,
net_if_get_link_addr(net_pkt_iface(pkt)));
memcpy(&addr, &prefix_info->prefix, sizeof(struct in6_addr) / 2);
ifaddr = net_if_ipv6_addr_lookup(&addr, NULL);
if (ifaddr && ifaddr->addr_type == NET_ADDR_AUTOCONF) {
if (prefix_info->valid_lifetime ==
NET_IPV6_ND_INFINITE_LIFETIME) {
net_if_addr_set_lf(ifaddr, true);
return;
}
/* RFC 4862 ch 5.5.3 */
if ((prefix_info->valid_lifetime > TWO_HOURS) ||
(prefix_info->valid_lifetime >
remaining(&ifaddr->lifetime))) {
NET_DBG("Timer updating for address %s "
"long lifetime %u secs",
net_sprint_ipv6_addr(&addr),
prefix_info->valid_lifetime);
net_if_ipv6_addr_update_lifetime(ifaddr,
prefix_info->valid_lifetime);
} else {
NET_DBG("Timer updating for address %s "
"lifetime %u secs",
net_sprint_ipv6_addr(&addr), TWO_HOURS);
net_if_ipv6_addr_update_lifetime(ifaddr, TWO_HOURS);
}
net_if_addr_set_lf(ifaddr, false);
} else {
if (prefix_info->valid_lifetime ==
NET_IPV6_ND_INFINITE_LIFETIME) {
net_if_ipv6_addr_add(net_pkt_iface(pkt),
&addr, NET_ADDR_AUTOCONF, 0);
} else {
net_if_ipv6_addr_add(net_pkt_iface(pkt),
&addr, NET_ADDR_AUTOCONF,
prefix_info->valid_lifetime);
}
}
}
static inline struct net_buf *handle_ra_prefix(struct net_pkt *pkt,
struct net_buf *frag,
u8_t len,
u16_t offset, u16_t *pos)
{
struct net_icmpv6_nd_opt_prefix_info prefix_info;
prefix_info.type = NET_ICMPV6_ND_OPT_PREFIX_INFO;
prefix_info.len = len * 8 - 2;
frag = net_frag_read(frag, offset, pos, 1, &prefix_info.prefix_len);
frag = net_frag_read(frag, *pos, pos, 1, &prefix_info.flags);
frag = net_frag_read_be32(frag, *pos, pos, &prefix_info.valid_lifetime);
frag = net_frag_read_be32(frag, *pos, pos,
&prefix_info.preferred_lifetime);
/* Skip reserved bytes */
frag = net_frag_skip(frag, *pos, pos, 4);
frag = net_frag_read(frag, *pos, pos, sizeof(struct in6_addr),
prefix_info.prefix.s6_addr);
if (!frag && *pos) {
return NULL;
}
if (prefix_info.valid_lifetime >= prefix_info.preferred_lifetime &&
!net_is_ipv6_ll_addr(&prefix_info.prefix)) {
if (prefix_info.flags & NET_ICMPV6_RA_FLAG_ONLINK) {
handle_prefix_onlink(pkt, &prefix_info);
}
if ((prefix_info.flags & NET_ICMPV6_RA_FLAG_AUTONOMOUS) &&
prefix_info.valid_lifetime &&
(prefix_info.prefix_len == NET_IPV6_DEFAULT_PREFIX_LEN)) {
handle_prefix_autonomous(pkt, &prefix_info);
}
}
return frag;
}
#if defined(CONFIG_NET_6LO_CONTEXT)
/* 6lowpan Context Option RFC 6775, 4.2 */
static inline struct net_buf *handle_ra_6co(struct net_pkt *pkt,
struct net_buf *frag,
u8_t len,
u16_t offset, u16_t *pos)
{
struct net_icmpv6_nd_opt_6co context;
context.type = NET_ICMPV6_ND_OPT_6CO;
context.len = len * 8 - 2;
frag = net_frag_read_u8(frag, offset, pos, &context.context_len);
/* RFC 6775, 4.2
* Context Length: 8-bit unsigned integer. The number of leading
* bits in the Context Prefix field that are valid. The value ranges
* from 0 to 128. If it is more than 64, then the Length MUST be 3.
*/
if (context.context_len > 64 && len != 3) {
return NULL;
}
if (context.context_len <= 64 && len != 2) {
return NULL;
}
context.context_len = context.context_len / 8;
frag = net_frag_read_u8(frag, *pos, pos, &context.flag);
/* Skip reserved bytes */
frag = net_frag_skip(frag, *pos, pos, 2);
frag = net_frag_read_be16(frag, *pos, pos, &context.lifetime);
/* RFC 6775, 4.2 (Length field). Length can be 2 or 3 depending
* on the length of context prefix field.
*/
if (len == 3) {
frag = net_frag_read(frag, *pos, pos, sizeof(struct in6_addr),
context.prefix.s6_addr);
} else if (len == 2) {
/* If length is 2 means only 64 bits of context prefix
* is available, rest set to zeros.
*/
frag = net_frag_read(frag, *pos, pos, 8,
context.prefix.s6_addr);
}
if (!frag && *pos) {
return NULL;
}
/* context_len: The number of leading bits in the Context Prefix
* field that are valid. So set remaining data to zero.
*/
if (context.context_len != sizeof(struct in6_addr)) {
memset(context.prefix.s6_addr + context.context_len, 0,
sizeof(struct in6_addr) - context.context_len);
}
net_6lo_set_context(net_pkt_iface(pkt), &context);
return frag;
}
#endif
static enum net_verdict handle_ra_input(struct net_pkt *pkt)
{
u16_t total_len = net_pkt_get_len(pkt);
struct net_nbr *nbr = NULL;
struct net_icmpv6_ra_hdr hdr, *ra_hdr;
struct net_if_router *router;
struct net_buf *frag;
u16_t router_lifetime;
u32_t reachable_time;
u32_t retrans_timer;
u8_t hop_limit;
u16_t offset;
u8_t length;
u8_t type;
u32_t mtu;
dbg_addr_recv("Router Advertisement",
&NET_IPV6_HDR(pkt)->src,
&NET_IPV6_HDR(pkt)->dst);
net_stats_update_ipv6_nd_recv();
if ((total_len < (sizeof(struct net_ipv6_hdr) +
sizeof(struct net_icmp_hdr) +
sizeof(struct net_icmpv6_ra_hdr) +
sizeof(struct net_icmpv6_nd_opt_hdr))) ||
(NET_IPV6_HDR(pkt)->hop_limit != NET_IPV6_ND_HOP_LIMIT) ||
!net_is_ipv6_ll_addr(&NET_IPV6_HDR(pkt)->src)) {
struct net_icmp_hdr icmphdr, *icmp_hdr;
icmp_hdr = net_icmpv6_get_hdr(pkt, &icmphdr);
if (!icmp_hdr || icmp_hdr->code != 0) {
goto drop;
}
}
frag = pkt->frags;
offset = sizeof(struct net_ipv6_hdr) + net_pkt_ipv6_ext_len(pkt) +
sizeof(struct net_icmp_hdr);
frag = net_frag_read_u8(frag, offset, &offset, &hop_limit);
frag = net_frag_skip(frag, offset, &offset, 1); /* flags */
if (!frag) {
goto drop;
}
if (hop_limit) {
net_ipv6_set_hop_limit(net_pkt_iface(pkt), hop_limit);
NET_DBG("New hop limit %d",
net_if_ipv6_get_hop_limit(net_pkt_iface(pkt)));
}
frag = net_frag_read_be16(frag, offset, &offset, &router_lifetime);
frag = net_frag_read_be32(frag, offset, &offset, &reachable_time);
frag = net_frag_read_be32(frag, offset, &offset, &retrans_timer);
if (!frag) {
goto drop;
}
ra_hdr = net_icmpv6_get_ra_hdr(pkt, &hdr);
NET_ASSERT(ra_hdr);
if (reachable_time &&
(net_if_ipv6_get_reachable_time(net_pkt_iface(pkt)) !=
ra_hdr->reachable_time)) {
net_if_ipv6_set_base_reachable_time(net_pkt_iface(pkt),
reachable_time);
net_if_ipv6_set_reachable_time(net_pkt_iface(pkt));
}
if (retrans_timer) {
net_if_ipv6_set_retrans_timer(net_pkt_iface(pkt),
retrans_timer);
}
while (frag) {
frag = net_frag_read(frag, offset, &offset, 1, &type);
frag = net_frag_read(frag, offset, &offset, 1, &length);
if (!frag) {
goto drop;
}
switch (type) {
case NET_ICMPV6_ND_OPT_SLLAO:
frag = handle_ra_neighbor(pkt, frag, length, offset,
&offset, &nbr);
if (!frag && offset) {
goto drop;
}
break;
case NET_ICMPV6_ND_OPT_MTU:
/* MTU has reserved 2 bytes, so skip it. */
frag = net_frag_skip(frag, offset, &offset, 2);
frag = net_frag_read_be32(frag, offset, &offset, &mtu);
if (!frag && offset) {
goto drop;
}
net_if_set_mtu(net_pkt_iface(pkt), mtu);
if (mtu > 0xffff) {
/* TODO: discard packet? */
NET_ERR("MTU %u, max is %u", mtu, 0xffff);
}
break;
case NET_ICMPV6_ND_OPT_PREFIX_INFO:
frag = handle_ra_prefix(pkt, frag, length, offset,
&offset);
if (!frag && offset) {
goto drop;
}
break;
#if defined(CONFIG_NET_6LO_CONTEXT)
case NET_ICMPV6_ND_OPT_6CO:
/* RFC 6775, 4.2 (Length)*/
if (!(length == 2 || length == 3)) {
NET_ERR("Invalid 6CO length %d", length);
goto drop;
}
frag = handle_ra_6co(pkt, frag, length, offset,
&offset);
if (!frag && offset) {
goto drop;
}
break;
#endif
case NET_ICMPV6_ND_OPT_ROUTE:
NET_DBG("Route option (0x%x) skipped", type);
goto skip;
#if defined(CONFIG_NET_IPV6_RA_RDNSS)
case NET_ICMPV6_ND_OPT_RDNSS:
NET_DBG("RDNSS option (0x%x) skipped", type);
goto skip;
#endif
case NET_ICMPV6_ND_OPT_DNSSL:
NET_DBG("DNSSL option (0x%x) skipped", type);
goto skip;
default:
NET_DBG("Unknown ND option 0x%x", type);
skip:
frag = net_frag_skip(frag, offset, &offset,
length * 8 - 2);
if (!frag && offset) {
goto drop;
}
break;
}
}
router = net_if_ipv6_router_lookup(net_pkt_iface(pkt),
&NET_IPV6_HDR(pkt)->src);
if (router) {
if (!router_lifetime) {
/* TODO: Start rs_timer on iface if no routers
* at all available on iface.
*/
net_if_ipv6_router_rm(router);
} else {
if (nbr) {
net_ipv6_nbr_data(nbr)->is_router = true;
}
net_if_ipv6_router_update_lifetime(router,
router_lifetime);
}
} else {
net_if_ipv6_router_add(net_pkt_iface(pkt),
&NET_IPV6_HDR(pkt)->src,
router_lifetime);
}
if (nbr && net_ipv6_nbr_data(nbr)->pending) {
NET_DBG("Sending pending pkt %p to %s",
net_ipv6_nbr_data(nbr)->pending,
net_sprint_ipv6_addr(&NET_IPV6_HDR(
net_ipv6_nbr_data(nbr)->pending)->dst));
if (net_send_data(net_ipv6_nbr_data(nbr)->pending) < 0) {
net_pkt_unref(net_ipv6_nbr_data(nbr)->pending);
}
nbr_clear_ns_pending(net_ipv6_nbr_data(nbr));
}
/* Cancel the RS timer on iface */
k_delayed_work_cancel(&net_pkt_iface(pkt)->ipv6.rs_timer);
net_pkt_unref(pkt);
return NET_OK;
drop:
net_stats_update_ipv6_nd_drop();
return NET_DROP;
}
#endif /* CONFIG_NET_IPV6_ND */
#if defined(CONFIG_NET_IPV6_MLD)
#define MLDv2_LEN (2 + 1 + 1 + 2 + sizeof(struct in6_addr) * 2)
static struct net_pkt *create_mldv2(struct net_pkt *pkt,
const struct in6_addr *addr,
u16_t record_type,
u8_t num_sources)
{
net_pkt_append_u8(pkt, record_type);
net_pkt_append_u8(pkt, 0); /* aux data len */
net_pkt_append_be16(pkt, num_sources); /* number of addresses */
net_pkt_append_all(pkt, sizeof(struct in6_addr), addr->s6_addr,
K_FOREVER);
if (num_sources > 0) {
/* All source addresses, RFC 3810 ch 3 */
net_pkt_append_all(pkt, sizeof(struct in6_addr),
net_ipv6_unspecified_address()->s6_addr,
K_FOREVER);
}
return pkt;
}
static int send_mldv2_raw(struct net_if *iface, struct net_buf *frags)
{
struct net_pkt *pkt;
struct in6_addr dst;
u16_t pos;
int ret;
/* Sent to all MLDv2-capable routers */
net_ipv6_addr_create(&dst, 0xff02, 0, 0, 0, 0, 0, 0, 0x0016);
pkt = net_pkt_get_reserve_tx(net_if_get_ll_reserve(iface, &dst),
K_FOREVER);
pkt = net_ipv6_create_raw(pkt,
net_if_ipv6_select_src_addr(iface, &dst),
&dst,
iface,
NET_IPV6_NEXTHDR_HBHO);
NET_IPV6_HDR(pkt)->hop_limit = 1; /* RFC 3810 ch 7.4 */
net_pkt_set_ipv6_hdr_prev(pkt, pkt->frags->len);
/* Add hop-by-hop option and router alert option, RFC 3810 ch 5. */
net_pkt_append_u8(pkt, IPPROTO_ICMPV6);
net_pkt_append_u8(pkt, 0); /* length (0 means 8 bytes) */
#define ROUTER_ALERT_LEN 8
/* IPv6 router alert option is described in RFC 2711. */
net_pkt_append_be16(pkt, 0x0502); /* RFC 2711 ch 2.1 */
net_pkt_append_be16(pkt, 0); /* pkt contains MLD msg */
net_pkt_append_u8(pkt, 0); /* padding */
net_pkt_append_u8(pkt, 0); /* padding */
/* ICMPv6 header */
net_pkt_append_u8(pkt, NET_ICMPV6_MLDv2); /* type */
net_pkt_append_u8(pkt, 0); /* code */
net_pkt_append_be16(pkt, 0); /* chksum */
pkt->frags->len = NET_IPV6ICMPH_LEN + ROUTER_ALERT_LEN;
net_pkt_set_iface(pkt, iface);
net_pkt_append_be16(pkt, 0); /* reserved field */
/* Insert the actual multicast record(s) here */
net_pkt_frag_add(pkt, frags);
ret = net_ipv6_finalize_raw(pkt, NET_IPV6_NEXTHDR_HBHO);
if (ret < 0) {
goto drop;
}
net_pkt_set_ipv6_ext_len(pkt, ROUTER_ALERT_LEN);
net_pkt_write_be16(pkt, pkt->frags,
NET_IPV6H_LEN + ROUTER_ALERT_LEN + 2,
&pos, ntohs(~net_calc_chksum_icmpv6(pkt)));
ret = net_send_data(pkt);
if (ret < 0) {
goto drop;
}
net_stats_update_icmp_sent();
net_stats_update_ipv6_mld_sent();
return 0;
drop:
net_pkt_unref(pkt);
net_stats_update_icmp_drop();
net_stats_update_ipv6_mld_drop();
return ret;
}
static int send_mldv2(struct net_if *iface, const struct in6_addr *addr,
u8_t mode)
{
struct net_pkt *pkt;
int ret;
pkt = net_pkt_get_reserve_tx(net_if_get_ll_reserve(iface, NULL),
K_FOREVER);
net_pkt_append_be16(pkt, 1); /* number of records */
pkt = create_mldv2(pkt, addr, mode, 1);
ret = send_mldv2_raw(iface, pkt->frags);
pkt->frags = NULL;
net_pkt_unref(pkt);
return ret;
}
int net_ipv6_mld_join(struct net_if *iface, const struct in6_addr *addr)
{
struct net_if_mcast_addr *maddr;
int ret;
maddr = net_if_ipv6_maddr_lookup(addr, &iface);
if (maddr && net_if_ipv6_maddr_is_joined(maddr)) {
return -EALREADY;
}
if (!maddr) {
maddr = net_if_ipv6_maddr_add(iface, addr);
if (!maddr) {
return -ENOMEM;
}
}
ret = send_mldv2(iface, addr, NET_IPV6_MLDv2_MODE_IS_EXCLUDE);
if (ret < 0) {
return ret;
}
net_if_ipv6_maddr_join(maddr);
net_if_mcast_monitor(iface, addr, true);
net_mgmt_event_notify(NET_EVENT_IPV6_MCAST_JOIN, iface);
return ret;
}
int net_ipv6_mld_leave(struct net_if *iface, const struct in6_addr *addr)
{
int ret;
if (!net_if_ipv6_maddr_rm(iface, addr)) {
return -EINVAL;
}
ret = send_mldv2(iface, addr, NET_IPV6_MLDv2_MODE_IS_INCLUDE);
if (ret < 0) {
return ret;
}
net_if_mcast_monitor(iface, addr, false);
net_mgmt_event_notify(NET_EVENT_IPV6_MCAST_LEAVE, iface);
return ret;
}
static void send_mld_report(struct net_if *iface)
{
struct net_pkt *pkt;
int i, count = 0;
pkt = net_pkt_get_reserve_tx(net_if_get_ll_reserve(iface, NULL),
K_FOREVER);
net_pkt_append_u8(pkt, 0); /* This will be the record count */
for (i = 0; i < NET_IF_MAX_IPV6_MADDR; i++) {
if (!iface->ipv6.mcast[i].is_used ||
!iface->ipv6.mcast[i].is_joined) {
continue;
}
pkt = create_mldv2(pkt, &iface->ipv6.mcast[i].address.in6_addr,
NET_IPV6_MLDv2_MODE_IS_EXCLUDE, 0);
count++;
}
if (count > 0) {
u16_t pos;
/* Write back the record count */
net_pkt_write_u8(pkt, pkt->frags, 0, &pos, count);
send_mldv2_raw(iface, pkt->frags);
pkt->frags = NULL;
}
net_pkt_unref(pkt);
}
static enum net_verdict handle_mld_query(struct net_pkt *pkt)
{
u16_t total_len = net_pkt_get_len(pkt);
struct in6_addr mcast;
u16_t max_rsp_code, num_src, pkt_len;
u16_t offset, pos;
struct net_buf *frag;
dbg_addr_recv("Multicast Listener Query",
&NET_IPV6_HDR(pkt)->src,
&NET_IPV6_HDR(pkt)->dst);
net_stats_update_ipv6_mld_recv();
/* offset tells now where the ICMPv6 header is starting */
frag = net_frag_get_pos(pkt,
net_pkt_ip_hdr_len(pkt) +
net_pkt_ipv6_ext_len(pkt) +
sizeof(struct net_icmp_hdr),
&offset);
frag = net_frag_read_be16(frag, offset, &pos, &max_rsp_code);
frag = net_frag_skip(frag, pos, &pos, 2); /* two reserved bytes */
frag = net_frag_read(frag, pos, &pos, sizeof(mcast), mcast.s6_addr);
frag = net_frag_skip(frag, pos, &pos, 2); /* skip S, QRV & QQIC */
frag = net_frag_read_be16(pkt->frags, pos, &pos, &num_src);
if (!frag && pos == 0xffff) {
goto drop;
}
pkt_len = sizeof(struct net_ipv6_hdr) + net_pkt_ipv6_ext_len(pkt) +
sizeof(struct net_icmp_hdr) + (2 + 2 + 16 + 2 + 2) +
sizeof(struct in6_addr) * num_src;
if ((total_len < pkt_len || pkt_len > NET_IPV6_MTU ||
(NET_IPV6_HDR(pkt)->hop_limit != 1))) {
struct net_icmp_hdr hdr, *icmp_hdr;
icmp_hdr = net_icmpv6_get_hdr(pkt, &hdr);
if (!icmp_hdr || icmp_hdr->code != 0) {
NET_DBG("Preliminary check failed %u/%u, code %u, "
"hop %u", total_len, pkt_len,
icmp_hdr->code, NET_IPV6_HDR(pkt)->hop_limit);
goto drop;
}
}
/* Currently we only support a unspecified address query. */
if (!net_ipv6_addr_cmp(&mcast, net_ipv6_unspecified_address())) {
NET_DBG("Only supporting unspecified address query (%s)",
net_sprint_ipv6_addr(&mcast));
goto drop;
}
send_mld_report(net_pkt_iface(pkt));
drop:
net_stats_update_ipv6_mld_drop();
return NET_DROP;
}
static struct net_icmpv6_handler mld_query_input_handler = {
.type = NET_ICMPV6_MLD_QUERY,
.code = 0,
.handler = handle_mld_query,
};
#endif /* CONFIG_NET_IPV6_MLD */
#if defined(CONFIG_NET_IPV6_NBR_CACHE)
static struct net_icmpv6_handler ns_input_handler = {
.type = NET_ICMPV6_NS,
.code = 0,
.handler = handle_ns_input,
};
static struct net_icmpv6_handler na_input_handler = {
.type = NET_ICMPV6_NA,
.code = 0,
.handler = handle_na_input,
};
#endif /* CONFIG_NET_IPV6_NBR_CACHE */
#if defined(CONFIG_NET_IPV6_ND)
static struct net_icmpv6_handler ra_input_handler = {
.type = NET_ICMPV6_RA,
.code = 0,
.handler = handle_ra_input,
};
#endif /* CONFIG_NET_IPV6_ND */
#if defined(CONFIG_NET_IPV6_FRAGMENT)
#if defined(CONFIG_NET_IPV6_FRAGMENT_TIMEOUT)
#define IPV6_REASSEMBLY_TIMEOUT K_SECONDS(CONFIG_NET_IPV6_FRAGMENT_TIMEOUT)
#else
#define IPV6_REASSEMBLY_TIMEOUT K_SECONDS(5)
#endif /* CONFIG_NET_IPV6_FRAGMENT_TIMEOUT */
#define FRAG_BUF_WAIT 10 /* how long to max wait for a buffer */
static void reassembly_timeout(struct k_work *work);
static bool reassembly_init_done;
static struct net_ipv6_reassembly
reassembly[CONFIG_NET_IPV6_FRAGMENT_MAX_COUNT];
static struct net_ipv6_reassembly *reassembly_get(u32_t id,
struct in6_addr *src,
struct in6_addr *dst)
{
int i, avail = -1;
for (i = 0; i < CONFIG_NET_IPV6_FRAGMENT_MAX_COUNT; i++) {
if (k_delayed_work_remaining_get(&reassembly[i].timer) &&
reassembly[i].id == id &&
net_ipv6_addr_cmp(src, &reassembly[i].src) &&
net_ipv6_addr_cmp(dst, &reassembly[i].dst)) {
return &reassembly[i];
}
if (k_delayed_work_remaining_get(&reassembly[i].timer)) {
continue;
}
if (avail < 0) {
avail = i;
}
}
if (avail < 0) {
return NULL;
}
k_delayed_work_submit(&reassembly[avail].timer,
IPV6_REASSEMBLY_TIMEOUT);
net_ipaddr_copy(&reassembly[avail].src, src);
net_ipaddr_copy(&reassembly[avail].dst, dst);
reassembly[avail].id = id;
return &reassembly[avail];
}
static bool reassembly_cancel(u32_t id,
struct in6_addr *src,
struct in6_addr *dst)
{
int i, j;
NET_DBG("Cancel 0x%x", id);
for (i = 0; i < CONFIG_NET_IPV6_FRAGMENT_MAX_COUNT; i++) {
s32_t remaining;
if (reassembly[i].id != id ||
!net_ipv6_addr_cmp(src, &reassembly[i].src) ||
!net_ipv6_addr_cmp(dst, &reassembly[i].dst)) {
continue;
}
remaining = k_delayed_work_remaining_get(&reassembly[i].timer);
if (remaining) {
k_delayed_work_cancel(&reassembly[i].timer);
}
NET_DBG("IPv6 reassembly id 0x%x remaining %d ms",
reassembly[i].id, remaining);
reassembly[i].id = 0;
for (j = 0; j < NET_IPV6_FRAGMENTS_MAX_PKT; j++) {
if (!reassembly[i].pkt[j]) {
continue;
}
NET_DBG("[%d] IPv6 reassembly pkt %p %zd bytes data",
j, reassembly[i].pkt[j],
net_pkt_get_len(reassembly[i].pkt[j]));
net_pkt_unref(reassembly[i].pkt[j]);
reassembly[i].pkt[j] = NULL;
}
return true;
}
return false;
}
static void reassembly_info(char *str, struct net_ipv6_reassembly *reass)
{
char out[NET_IPV6_ADDR_LEN];
int i, len;
snprintk(out, sizeof(out), "%s", net_sprint_ipv6_addr(&reass->dst));
for (i = 0, len = 0; i < NET_IPV6_FRAGMENTS_MAX_PKT; i++) {
len += net_pkt_get_len(reass->pkt[i]);
}
NET_DBG("%s id 0x%x src %s dst %s remain %d ms len %d",
str, reass->id, net_sprint_ipv6_addr(&reass->src), out,
k_delayed_work_remaining_get(&reass->timer), len);
}
static void reassembly_timeout(struct k_work *work)
{
struct net_ipv6_reassembly *reass =
CONTAINER_OF(work, struct net_ipv6_reassembly, timer);
reassembly_info("Reassembly cancelled", reass);
reassembly_cancel(reass->id, &reass->src, &reass->dst);
}
static void reassemble_packet(struct net_ipv6_reassembly *reass)
{
struct net_pkt *pkt;
struct net_buf *last;
u8_t next_hdr;
int i, len, ret;
u16_t pos;
k_delayed_work_cancel(&reass->timer);
NET_ASSERT(reass->pkt[0]);
last = net_buf_frag_last(reass->pkt[0]->frags);
/* We start from 2nd packet which is then appended to
* the first one.
*/
for (i = 1; i < NET_IPV6_FRAGMENTS_MAX_PKT; i++) {
int removed_len;
pkt = reass->pkt[i];
/* Get rid of IPv6 and fragment header which are at
* the beginning of the fragment.
*/
removed_len = net_pkt_ipv6_fragment_start(pkt) +
sizeof(struct net_ipv6_frag_hdr) -
pkt->frags->data;
NET_DBG("Removing %d bytes from start of pkt %p",
removed_len, pkt->frags);
NET_ASSERT(removed_len >= (sizeof(struct net_ipv6_hdr) +
sizeof(struct net_ipv6_frag_hdr)));
net_buf_pull(pkt->frags, removed_len);
/* Attach the data to previous pkt */
last->frags = pkt->frags;
last = net_buf_frag_last(pkt->frags);
pkt->frags = NULL;
reass->pkt[i] = NULL;
net_pkt_unref(pkt);
}
pkt = reass->pkt[0];
reass->pkt[0] = NULL;
/* Next we need to strip away the fragment header from the first packet
* and set the various pointers and values in packet.
*/
next_hdr = net_pkt_ipv6_fragment_start(pkt)[0];
/* How much data we need to move in order to get rid of the
* fragmentation header.
*/
len = pkt->frags->len - sizeof(struct net_ipv6_frag_hdr) -
(net_pkt_ipv6_fragment_start(pkt) - pkt->frags->data);
memmove(net_pkt_ipv6_fragment_start(pkt),
net_pkt_ipv6_fragment_start(pkt) +
sizeof(struct net_ipv6_frag_hdr), len);
/* This one updates the previous header's nexthdr value */
net_pkt_write_u8(pkt, pkt->frags, net_pkt_ipv6_hdr_prev(pkt),
&pos, next_hdr);
pkt->frags->len -= sizeof(struct net_ipv6_frag_hdr);
if (!net_pkt_compact(pkt)) {
NET_ERR("Cannot compact reassembly packet %p", pkt);
net_pkt_unref(pkt);
return;
}
/* Fix the total length of the IPv6 packet. */
len = net_pkt_ipv6_ext_len(pkt);
if (len > 0) {
NET_DBG("Old pkt %p IPv6 ext len is %d bytes", pkt, len);
net_pkt_set_ipv6_ext_len(pkt,
len - sizeof(struct net_ipv6_frag_hdr));
}
len = net_pkt_get_len(pkt) - sizeof(struct net_ipv6_hdr);
NET_IPV6_HDR(pkt)->len[0] = len >> 8;
NET_IPV6_HDR(pkt)->len[1] = len & 0xff;
NET_DBG("New pkt %p IPv6 len is %d bytes", pkt, len);
/* We need to use the queue when feeding the packet back into the
* IP stack as we might run out of stack if we call processing_data()
* directly. As the packet does not contain link layer header, we
* MUST NOT pass it to L2 so there will be a special check for that
* in process_data() when handling the packet.
*/
ret = net_recv_data(net_pkt_iface(pkt), pkt);
if (ret < 0) {
net_pkt_unref(pkt);
}
}
void net_ipv6_frag_foreach(net_ipv6_frag_cb_t cb, void *user_data)
{
int i;
for (i = 0; reassembly_init_done &&
i < CONFIG_NET_IPV6_FRAGMENT_MAX_COUNT; i++) {
if (!k_delayed_work_remaining_get(&reassembly[i].timer)) {
continue;
}
cb(&reassembly[i], user_data);
}
}
/* Verify that we have all the fragments received and in correct order.
*/
static bool fragment_verify(struct net_ipv6_reassembly *reass)
{
u16_t offset;
int i, prev_len;
prev_len = net_pkt_get_len(reass->pkt[0]);
offset = net_pkt_ipv6_fragment_offset(reass->pkt[0]);
NET_DBG("pkt %p offset %u", reass->pkt[0], offset);
if (offset != 0) {
return false;
}
for (i = 1; i < NET_IPV6_FRAGMENTS_MAX_PKT; i++) {
offset = net_pkt_ipv6_fragment_offset(reass->pkt[i]);
NET_DBG("pkt %p offset %u prev_len %d", reass->pkt[i],
offset, prev_len);
if (prev_len < offset) {
/* Something wrong with the offset value */
return false;
}
prev_len = net_pkt_get_len(reass->pkt[i]);
}
return true;
}
static int shift_packets(struct net_ipv6_reassembly *reass, int pos)
{
int i;
for (i = pos + 1; i < NET_IPV6_FRAGMENTS_MAX_PKT; i++) {
if (!reass->pkt[i]) {
NET_DBG("Moving [%d] %p (offset 0x%x) to [%d]",
pos, reass->pkt[pos],
net_pkt_ipv6_fragment_offset(reass->pkt[pos]),
i);
/* Do we have enough space in packet array to make
* the move?
*/
if (((i - pos) + 1) >
(NET_IPV6_FRAGMENTS_MAX_PKT - i)) {
return -ENOMEM;
}
memmove(&reass->pkt[i], &reass->pkt[pos],
sizeof(void *) * (i - pos));
return 0;
}
}
return -EINVAL;
}
static enum net_verdict handle_fragment_hdr(struct net_pkt *pkt,
struct net_buf *frag,
int total_len,
u16_t buf_offset)
{
struct net_ipv6_reassembly *reass = NULL;
u32_t id;
u16_t loc;
u16_t offset;
u16_t flag;
u8_t nexthdr;
u8_t more;
bool found;
int i;
if (!reassembly_init_done) {
/* Static initializing does not work here because of the array
* so we must do it at runtime.
*/
for (i = 0; i < CONFIG_NET_IPV6_FRAGMENT_MAX_COUNT; i++) {
k_delayed_work_init(&reassembly[i].timer,
reassembly_timeout);
}
reassembly_init_done = true;
}
net_pkt_set_ipv6_fragment_start(pkt, frag->data + buf_offset);
/* Each fragment has a fragment header. */
frag = net_frag_read_u8(frag, buf_offset, &loc, &nexthdr);
frag = net_frag_skip(frag, loc, &loc, 1); /* reserved */
frag = net_frag_read_be16(frag, loc, &loc, &flag);
frag = net_frag_read_be32(frag, loc, &loc, &id);
if (!frag && loc == 0xffff) {
goto drop;
}
reass = reassembly_get(id, &NET_IPV6_HDR(pkt)->src,
&NET_IPV6_HDR(pkt)->dst);
if (!reass) {
NET_DBG("Cannot get reassembly slot, dropping pkt %p", pkt);
goto drop;
}
offset = flag & 0xfff8;
more = flag & 0x01;
net_pkt_set_ipv6_fragment_offset(pkt, offset);
if (!reass->pkt[0]) {
NET_DBG("Storing pkt %p to slot %d offset 0x%x", pkt, 0,
offset);
reass->pkt[0] = pkt;
reassembly_info("Reassembly 1st pkt", reass);
/* Wait for more fragments to receive. */
goto accept;
}
/* The fragments might come in wrong order so place them
* in reassembly chain in correct order.
*/
for (i = 0, found = false; i < NET_IPV6_FRAGMENTS_MAX_PKT; i++) {
if (!reass->pkt[i]) {
NET_DBG("Storing pkt %p to slot %d offset 0x%x", pkt,
i, offset);
reass->pkt[i] = pkt;
found = true;
break;
}
if (net_pkt_ipv6_fragment_offset(reass->pkt[i]) < offset) {
continue;
}
/* Make room for this fragment, if there is no room, then
* discard the whole reassembly.
*/
if (shift_packets(reass, i)) {
break;
}
NET_DBG("Storing %p (offset 0x%x) to [%d]", pkt, offset, i);
reass->pkt[i] = pkt;
found = true;
break;
}
if (!found) {
/* We could not add this fragment into our saved fragment
* list. We must discard the whole packet at this point.
*/
NET_DBG("No slots available for 0x%x", reass->id);
goto drop;
}
if (more) {
if (net_pkt_get_len(pkt) % 8) {
/* Fragment length is not multiple of 8, discard
* the packet and send parameter problem error.
*/
net_icmpv6_send_error(pkt, NET_ICMPV6_PARAM_PROBLEM,
NET_ICMPV6_PARAM_PROB_OPTION, 0);
goto drop;
}
reassembly_info("Reassembly nth pkt", reass);
NET_DBG("More fragments to be received");
goto accept;
}
reassembly_info("Reassembly last pkt", reass);
if (!fragment_verify(reass)) {
NET_DBG("Reassembled IPv6 verify failed, dropping id %u",
reass->id);
/* Let the caller release the already inserted pkt */
if (i < NET_IPV6_FRAGMENTS_MAX_PKT) {
reass->pkt[i] = NULL;
}
goto drop;
}
/* The last fragment received, reassemble the packet */
reassemble_packet(reass);
accept:
return NET_OK;
drop:
if (reass) {
reassembly_cancel(reass->id, &reass->src, &reass->dst);
}
return NET_DROP;
}
static int get_next_hdr(struct net_pkt *pkt, u16_t *next_hdr_idx,
u16_t *last_hdr_idx, u8_t *next_hdr)
{
struct net_buf *buf;
u16_t pos;
int ret;
/* We need to fix the next header value so find out where
* is the last IPv6 extension header. The next_hdr_idx value is
* offset from the start of the 1st fragment, it is not the
* actual next header value.
*/
ret = net_ipv6_find_last_ext_hdr(pkt, next_hdr_idx, last_hdr_idx);
if (ret < 0) {
NET_DBG("Cannot find the last IPv6 ext header");
return ret;
}
/* The IPv6 must fit into first fragment, otherwise the next read
* will fail.
*/
if (*next_hdr_idx > pkt->frags->len) {
NET_DBG("IPv6 header too short (%d vs %d)", *next_hdr_idx,
pkt->frags->len);
return -EINVAL;
}
if (*last_hdr_idx > pkt->frags->len) {
NET_DBG("IPv6 header too short (%d vs %d)", *last_hdr_idx,
pkt->frags->len);
return -EINVAL;
}
buf = net_frag_read_u8(pkt->frags, *next_hdr_idx, &pos, next_hdr);
if (!buf && pos == 0xffff) {
NET_DBG("Next header too far (%d vs %d)", *next_hdr_idx,
pkt->frags->len);
return -EINVAL;
}
return 0;
}
static int send_ipv6_fragment(struct net_if *iface,
struct net_pkt *pkt,
struct net_buf *orig,
struct net_buf *prev,
struct net_buf *frag,
u16_t ipv6_len,
u16_t offset,
int len,
u8_t next_hdr,
u16_t next_hdr_idx,
u16_t last_hdr_idx,
bool final,
int frag_count)
{
struct net_buf *rest = NULL, *end = NULL, *orig_copy = NULL;
struct net_ipv6_frag_hdr hdr;
struct net_pkt *ipv6;
u16_t pos;
int ret;
/* Prepare the pkt so that the IPv6 packet will be sent properly
* to the device driver.
*/
if (net_pkt_context(pkt)) {
ipv6 = net_pkt_get_tx(net_pkt_context(pkt), FRAG_BUF_WAIT);
} else {
ipv6 = net_pkt_get_reserve_tx(
net_if_get_ll_reserve(iface, &NET_IPV6_HDR(pkt)->dst),
FRAG_BUF_WAIT);
}
if (!ipv6) {
NET_DBG("Cannot get packet (%d)", -ENOMEM);
return -ENOMEM;
}
/* How much stuff we can send from this fragment so that it will fit
* into IPv6 MTU (1280 bytes).
*/
if (len > 0) {
NET_ASSERT_INFO(len <= (NET_IPV6_MTU -
sizeof(struct net_ipv6_frag_hdr) -
ipv6_len),
"len %u, frag->len %d", len, frag->len);
ret = net_pkt_split(pkt, frag, len, &end, &rest,
FRAG_BUF_WAIT);
if (ret < 0) {
NET_DBG("Cannot split fragment (%d)", ret);
goto free_pkts;
}
}
/* So now the frag is split into two pieces, first one is called "end"
* (as it is the end of the packet), and the second one is called
* "rest" (as that part is the rest we need to still send).
*
* Then take out the "frag" from the list as it is now split and not
* needed.
*/
if (rest) {
rest->frags = frag->frags;
frag->frags = NULL;
net_pkt_frag_unref(frag);
}
if (prev) {
prev->frags = end;
} else {
pkt->frags = end;
}
if (end) {
end->frags = NULL;
}
memcpy(ipv6, pkt, sizeof(struct net_pkt));
/* We must not take the fragments from the original packet (yet) */
ipv6->frags = NULL;
/* Update the extension length metadata so that upper layer checksum
* will be calculated properly by net_ipv6_finalize_raw().
*/
net_pkt_set_ipv6_ext_len(ipv6,
net_pkt_ipv6_ext_len(pkt) +
sizeof(struct net_ipv6_frag_hdr));
orig_copy = net_buf_clone(orig, FRAG_BUF_WAIT);
if (!orig_copy) {
ret = -ENOMEM;
NET_DBG("Cannot clone IPv6 header (%d)", ret);
goto free_pkts;
}
/* Then add the IPv6 header into the packet. */
net_pkt_frag_insert(ipv6, orig_copy);
/* Avoid double free if there is an error later in this function. */
orig_copy = NULL;
/* And we need to update the last header in the IPv6 packet to point to
* fragment header.
*/
net_pkt_write_u8(ipv6, ipv6->frags, next_hdr_idx, &pos,
NET_IPV6_NEXTHDR_FRAG);
NET_ASSERT(pos != next_hdr_idx);
hdr.reserved = 0;
hdr.id = net_pkt_ipv6_fragment_id(pkt);
hdr.offset = htons(((offset / 8) << 3) | !final);
hdr.nexthdr = next_hdr;
/* Then add the fragmentation header. */
ret = net_pkt_insert(ipv6, ipv6->frags, last_hdr_idx,
sizeof(hdr), (u8_t *)&hdr, FRAG_BUF_WAIT);
if (!ret) {
/* If we could not insert because we are already at the
* end of fragment, then just append data to the end of
* the IPv6 header.
*/
ret = net_pkt_append_all(ipv6, sizeof(hdr), (u8_t *)&hdr,
FRAG_BUF_WAIT);
if (!ret) {
ret = -ENOMEM;
NET_DBG("Cannot add IPv6 frag header (%d)", ret);
goto free_pkts;
}
}
/* Tie all the fragments together to form an IPv6 packet. Then
* update the length of the packet and optionally the checksum.
*/
net_pkt_frag_add(ipv6, pkt->frags);
/* Note that we must not calculate possible UDP/TCP/ICMPv6 checksum
* as that is already calculated in the non-fragmented packet.
*/
ret = net_ipv6_finalize_raw(ipv6, NET_IPV6_NEXTHDR_FRAG);
if (ret < 0) {
NET_DBG("Cannot create IPv6 packet (%d)", ret);
goto free_pkts;
}
NET_DBG("Sending fragment len %zd", net_pkt_get_len(ipv6));
/* If everything has been ok so far, we can send the packet.
* Note that we cannot send this re-constructed packet directly
* as the link layer headers will not be properly set (because
* we recreated the packet). So pass this packet back to TX
* so that the pkt is going back to L2 for setup.
*/
ret = net_send_data(ipv6);
if (ret < 0) {
NET_DBG("Cannot send fragment (%d)", ret);
goto free_pkts;
}
/* Then process the rest of the fragments */
pkt->frags = rest;
/* Let this packet to be sent and hopefully it will release
* the memory that can be utilized for next sent IPv6 fragment.
*/
k_yield();
return 0;
free_pkts:
net_pkt_unref(ipv6);
if (rest) {
net_pkt_frag_unref(rest);
}
if (orig_copy) {
net_pkt_frag_unref(orig_copy);
}
return ret;
}
#define BUF_ALLOC_TIMEOUT 100
int net_ipv6_send_fragmented_pkt(struct net_if *iface, struct net_pkt *pkt,
u16_t pkt_len)
{
struct net_buf *orig_ipv6 = NULL;
struct net_buf *prev = NULL;
struct net_buf *rest;
struct net_buf *frag;
struct net_pkt *clone;
int frag_count = 0;
int curr_len = 0;
int status = false;
u16_t ipv6_len = 0, offset = 0;
u32_t id = sys_rand32_get();
u8_t next_hdr;
u16_t next_hdr_idx, last_hdr_idx;
int ret;
/* We cannot touch original pkt because it might be used for
* some other purposes, like TCP resend etc. So we need to copy
* the large pkt here and do the fragmenting with the clone.
*/
clone = net_pkt_clone(pkt, BUF_ALLOC_TIMEOUT);
if (!clone) {
NET_DBG("Cannot clone %p", pkt);
return -ENOMEM;
}
pkt = clone;
frag = pkt->frags;
ret = get_next_hdr(pkt, &next_hdr_idx, &last_hdr_idx, &next_hdr);
if (ret < 0) {
return -EINVAL;
}
/* Split the first fragment that contains the IPv6 header into
* two pieces. The "orig_ipv6" will only contain the original IPv6
* header which is copied into each fragment together with
* fragmentation header.
*/
ret = net_pkt_split(pkt, frag,
net_pkt_ip_hdr_len(pkt) + net_pkt_ipv6_ext_len(pkt),
&orig_ipv6, &rest, FRAG_BUF_WAIT);
if (ret < 0) {
NET_DBG("Cannot split packet (%d)", ret);
return ret;
}
ipv6_len = net_buf_frags_len(orig_ipv6);
/* We do not need the first fragment any more. The "rest" will not
* have IPv6 header but it will contain the rest of the original data.
*/
rest->frags = pkt->frags->frags;
pkt->frags = rest;
frag->frags = NULL;
net_pkt_frag_unref(frag);
frag = pkt->frags;
net_pkt_set_ipv6_fragment_id(pkt, id);
/* Go through the fragment list, and create suitable IPv6 packet
* from the data.
*/
while (frag) {
curr_len += frag->len;
if (curr_len > (NET_IPV6_MTU -
sizeof(struct net_ipv6_frag_hdr) - ipv6_len)) {
/* The fit_len var tells how much data we need send
* from frag in order to fill the IPv6 MTU.
*/
int fit_len = NET_IPV6_MTU -
sizeof(struct net_ipv6_frag_hdr) - ipv6_len -
(curr_len - frag->len);
status = send_ipv6_fragment(iface, pkt, orig_ipv6,
prev, frag, ipv6_len,
offset, fit_len,
next_hdr, next_hdr_idx,
last_hdr_idx, false,
frag_count);
if (status < 0) {
goto out;
}
offset += curr_len - (frag->len - fit_len);
prev = NULL;
frag = pkt->frags;
curr_len = 0;
frag_count++;
}
prev = frag;
frag = frag->frags;
}
status = send_ipv6_fragment(iface, pkt, orig_ipv6, prev, prev,
ipv6_len, offset, 0, next_hdr,
next_hdr_idx, last_hdr_idx, true,
frag_count);
net_pkt_unref(pkt);
out:
if (orig_ipv6) {
net_pkt_frag_unref(orig_ipv6);
}
return status;
}
#endif /* CONFIG_NET_IPV6_FRAGMENT */
static inline enum net_verdict process_icmpv6_pkt(struct net_pkt *pkt,
struct net_ipv6_hdr *ipv6)
{
struct net_icmp_hdr hdr, *icmp_hdr;
icmp_hdr = net_icmpv6_get_hdr(pkt, &hdr);
if (!icmp_hdr) {
NET_DBG("NULL ICMPv6 header - dropping");
return NET_DROP;
}
NET_DBG("ICMPv6 %s received type %d code %d",
net_icmpv6_type2str(icmp_hdr->type), icmp_hdr->type,
icmp_hdr->code);
return net_icmpv6_input(pkt, icmp_hdr->type, icmp_hdr->code);
}
static inline struct net_pkt *check_unknown_option(struct net_pkt *pkt,
u8_t opt_type,
u16_t length)
{
/* RFC 2460 chapter 4.2 tells how to handle the unknown
* options by the two highest order bits of the option:
*
* 00: Skip over this option and continue processing the header.
* 01: Discard the packet.
* 10: Discard the packet and, regardless of whether or not the
* packet's Destination Address was a multicast address,
* send an ICMP Parameter Problem, Code 2, message to the packet's
* Source Address, pointing to the unrecognized Option Type.
* 11: Discard the packet and, only if the packet's Destination
* Address was not a multicast address, send an ICMP Parameter
* Problem, Code 2, message to the packet's Source Address,
* pointing to the unrecognized Option Type.
*/
NET_DBG("Unknown option %d (0x%02x) MSB %d", opt_type, opt_type,
opt_type >> 6);
switch (opt_type & 0xc0) {
case 0x00:
break;
case 0x40:
return NULL;
case 0xc0:
if (net_is_ipv6_addr_mcast(&NET_IPV6_HDR(pkt)->dst)) {
return NULL;
}
/* passthrough */
case 0x80:
net_icmpv6_send_error(pkt, NET_ICMPV6_PARAM_PROBLEM,
NET_ICMPV6_PARAM_PROB_OPTION,
(u32_t)length);
return NULL;
}
return pkt;
}
static inline struct net_buf *handle_ext_hdr_options(struct net_pkt *pkt,
struct net_buf *frag,
int total_len,
u16_t len,
u16_t offset,
u16_t *pos,
enum net_verdict *verdict)
{
u8_t opt_type, opt_len;
u16_t length = 0, loc;
#if defined(CONFIG_NET_RPL)
bool result;
#endif
if (len > total_len) {
NET_DBG("Corrupted packet, extension header %d too long "
"(max %d bytes)", len, total_len);
*verdict = NET_DROP;
return NULL;
}
length += 2;
/* Each extension option has type and length */
frag = net_frag_read_u8(frag, offset, &loc, &opt_type);
frag = net_frag_read_u8(frag, loc, &loc, &opt_len);
if (!frag && loc == 0xffff) {
goto drop;
}
while (frag && (length < len)) {
switch (opt_type) {
case NET_IPV6_EXT_HDR_OPT_PAD1:
NET_DBG("PAD1 option");
length++;
/* We need to step back as the PAD1 len is only one
* byte and we read already one extra byte.
*/
loc--;
break;
case NET_IPV6_EXT_HDR_OPT_PADN:
NET_DBG("PADN option");
length += opt_len + 2;
loc += opt_len + 2;
break;
#if defined(CONFIG_NET_RPL)
case NET_IPV6_EXT_HDR_OPT_RPL:
NET_DBG("Processing RPL option");
frag = net_rpl_verify_header(pkt, frag, loc, &loc,
&result);
if (!result) {
NET_DBG("RPL option error, packet dropped");
goto drop;
}
if (!frag && *pos == 0xffff) {
goto drop;
}
*verdict = NET_CONTINUE;
return frag;
#endif
default:
if (!check_unknown_option(pkt, opt_type, length)) {
goto drop;
}
length += opt_len + 2;
/* No need to +2 here as loc already contains option
* header len.
*/
loc += opt_len;
break;
}
if (length >= len) {
break;
}
frag = net_frag_read_u8(frag, loc, &loc, &opt_type);
frag = net_frag_read_u8(frag, loc, &loc, &opt_len);
if (!frag && loc == 0xffff) {
goto drop;
}
}
if (length != len) {
goto drop;
}
*pos += length;
*verdict = NET_CONTINUE;
return frag;
drop:
*verdict = NET_DROP;
return NULL;
}
static inline bool is_upper_layer_protocol_header(u8_t proto)
{
return (proto == IPPROTO_ICMPV6 || proto == IPPROTO_UDP ||
proto == IPPROTO_TCP);
}
#if defined(CONFIG_NET_ROUTE)
static struct net_route_entry *add_route(struct net_if *iface,
struct in6_addr *addr,
u8_t prefix_len)
{
struct net_route_entry *route;
route = net_route_lookup(iface, addr);
if (route) {
return route;
}
route = net_route_add(iface, addr, prefix_len, addr);
NET_DBG("%s route to %s/%d iface %p", route ? "Add" : "Cannot add",
net_sprint_ipv6_addr(addr), prefix_len, iface);
return route;
}
#endif /* CONFIG_NET_ROUTE */
static void no_route_info(struct net_pkt *pkt,
struct in6_addr *src,
struct in6_addr *dst)
{
#if defined(CONFIG_NET_DEBUG_IPV6) && (CONFIG_SYS_LOG_NET_LEVEL > 3)
char out[NET_IPV6_ADDR_LEN];
snprintk(out, sizeof(out), "%s", net_sprint_ipv6_addr(dst));
NET_DBG("Will not route pkt %p ll src %s to dst %s between interfaces",
pkt, net_sprint_ipv6_addr(src), out);
#endif
}
#if defined(CONFIG_NET_ROUTE)
static enum net_verdict route_ipv6_packet(struct net_pkt *pkt,
struct net_ipv6_hdr *hdr)
{
struct net_route_entry *route;
struct in6_addr *nexthop;
bool found;
/* Check if the packet can be routed */
if (IS_ENABLED(CONFIG_NET_ROUTING)) {
found = net_route_get_info(NULL, &hdr->dst, &route,
&nexthop);
} else {
found = net_route_get_info(net_pkt_iface(pkt),
&hdr->dst, &route, &nexthop);
}
if (found) {
int ret;
if (IS_ENABLED(CONFIG_NET_ROUTING) &&
(net_is_ipv6_ll_addr(&hdr->src) ||
net_is_ipv6_ll_addr(&hdr->dst))) {
/* RFC 4291 ch 2.5.6 */
no_route_info(pkt, &hdr->src, &hdr->dst);
goto drop;
}
/* Used when detecting if the original link
* layer address length is changed or not.
*/
net_pkt_set_orig_iface(pkt, net_pkt_iface(pkt));
if (route) {
net_pkt_set_iface(pkt, route->iface);
}
if (IS_ENABLED(CONFIG_NET_ROUTING) &&
net_pkt_orig_iface(pkt) != net_pkt_iface(pkt)) {
/* If the route interface to destination is
* different than the original route, then add
* route to original source.
*/
NET_DBG("Route pkt %p from %p to %p",
pkt, net_pkt_orig_iface(pkt),
net_pkt_iface(pkt));
add_route(net_pkt_orig_iface(pkt),
&NET_IPV6_HDR(pkt)->src, 128);
}
ret = net_route_packet(pkt, nexthop);
if (ret < 0) {
NET_DBG("Cannot re-route pkt %p via %s "
"at iface %p (%d)",
pkt, net_sprint_ipv6_addr(nexthop),
net_pkt_iface(pkt), ret);
} else {
return NET_OK;
}
} else {
NET_DBG("No route to %s pkt %p dropped",
net_sprint_ipv6_addr(&hdr->dst), pkt);
}
drop:
return NET_DROP;
}
#endif /* CONFIG_NET_ROUTE */
enum net_verdict net_ipv6_process_pkt(struct net_pkt *pkt)
{
struct net_ipv6_hdr *hdr = NET_IPV6_HDR(pkt);
int real_len = net_pkt_get_len(pkt);
int pkt_len = (hdr->len[0] << 8) + hdr->len[1] + sizeof(*hdr);
struct net_buf *frag;
u8_t start_of_ext, prev_hdr;
u8_t next, next_hdr, length;
u8_t first_option;
u16_t offset, total_len = 0;
u8_t ext_bitmap;
if (real_len != pkt_len) {
NET_DBG("IPv6 packet size %d pkt len %d", pkt_len, real_len);
net_stats_update_ipv6_drop();
goto drop;
}
#if defined(CONFIG_NET_DEBUG_IPV6)
do {
char out[NET_IPV6_ADDR_LEN];
snprintk(out, sizeof(out), "%s",
net_sprint_ipv6_addr(&hdr->dst));
NET_DBG("IPv6 packet len %d received from %s to %s",
real_len, net_sprint_ipv6_addr(&hdr->src), out);
} while (0);
#endif /* CONFIG_NET_DEBUG_IPV6 */
if (net_is_ipv6_addr_mcast(&hdr->src)) {
NET_DBG("Dropping src multicast packet");
net_stats_update_ipv6_drop();
goto drop;
}
if (!net_is_my_ipv6_addr(&hdr->dst) &&
!net_is_my_ipv6_maddr(&hdr->dst) &&
!net_is_ipv6_addr_mcast(&hdr->dst) &&
!net_is_ipv6_addr_loopback(&hdr->dst)) {
#if defined(CONFIG_NET_ROUTE)
enum net_verdict verdict;
verdict = route_ipv6_packet(pkt, hdr);
if (verdict == NET_OK) {
return NET_OK;
}
#else /* CONFIG_NET_ROUTE */
NET_DBG("IPv6 packet in pkt %p not for me", pkt);
#endif /* CONFIG_NET_ROUTE */
net_stats_update_ipv6_drop();
goto drop;
}
/* If we receive a packet with ll source address fe80: and destination
* address is one of ours, and if the packet would cross interface
* boundary, then drop the packet. RFC 4291 ch 2.5.6
*/
if (IS_ENABLED(CONFIG_NET_ROUTING) &&
net_is_ipv6_ll_addr(&hdr->src) &&
!net_is_ipv6_addr_mcast(&hdr->dst) &&
!net_if_ipv6_addr_lookup_by_iface(net_pkt_iface(pkt),
&hdr->dst)) {
no_route_info(pkt, &hdr->src, &hdr->dst);
net_stats_update_ipv6_drop();
goto drop;
}
/* Check extension headers */
net_pkt_set_next_hdr(pkt, &hdr->nexthdr);
net_pkt_set_ipv6_ext_len(pkt, 0);
net_pkt_set_ip_hdr_len(pkt, sizeof(struct net_ipv6_hdr));
/* Fast path for main upper layer protocols. The handling of extension
* headers can be slow so do this checking here. There cannot
* be any extension headers after the upper layer protocol header.
*/
next = *(net_pkt_next_hdr(pkt));
if (is_upper_layer_protocol_header(next)) {
goto upper_proto;
}
/* Go through the extensions */
frag = pkt->frags;
next = hdr->nexthdr;
first_option = next;
ext_bitmap = 0;
offset = sizeof(struct net_ipv6_hdr);
prev_hdr = &NET_IPV6_HDR(pkt)->nexthdr - &NET_IPV6_HDR(pkt)->vtc;
while (frag) {
enum net_verdict verdict;
if (is_upper_layer_protocol_header(next)) {
NET_DBG("IPv6 next header %d", next);
net_pkt_set_ipv6_ext_len(pkt, offset -
sizeof(struct net_ipv6_hdr));
goto upper_proto;
}
start_of_ext = offset;
frag = net_frag_read_u8(frag, offset, &offset, &next_hdr);
frag = net_frag_read_u8(frag, offset, &offset, &length);
if (!frag && offset == 0xffff) {
goto drop;
}
length = length * 8 + 8;
total_len += length;
verdict = NET_OK;
if (next == NET_IPV6_NEXTHDR_HBHO) {
NET_DBG("IPv6 next header %d length %d bytes", next,
length);
} else {
/* There is no separate length for other headers */
NET_DBG("IPv6 next header %d", next);
}
switch (next) {
case NET_IPV6_NEXTHDR_NONE:
/* There is nothing after this header (see RFC 2460,
* ch 4.7), so we can drop the packet now.
* This is not an error case so do not update drop
* statistics.
*/
goto drop;
case NET_IPV6_NEXTHDR_HBHO:
/* HBH option needs to be the first one */
if (first_option != NET_IPV6_NEXTHDR_HBHO) {
goto bad_hdr;
}
/* Hop by hop option */
if (ext_bitmap & NET_IPV6_EXT_HDR_BITMAP_HBHO) {
goto bad_hdr;
}
ext_bitmap |= NET_IPV6_EXT_HDR_BITMAP_HBHO;
frag = handle_ext_hdr_options(pkt, frag, real_len,
length, offset, &offset,
&verdict);
break;
#if defined(CONFIG_NET_IPV6_FRAGMENT)
case NET_IPV6_NEXTHDR_FRAG:
net_pkt_set_ipv6_hdr_prev(pkt, prev_hdr);
/* The fragment header does not have length field so
* we need to step back two bytes and start from the
* beginning of the fragment header.
*/
return handle_fragment_hdr(pkt, frag, real_len,
offset - 2);
#endif
default:
goto bad_hdr;
}
if (verdict == NET_DROP) {
goto drop;
}
prev_hdr = start_of_ext;
next = next_hdr;
}
upper_proto:
if (total_len > 0) {
NET_DBG("Extension len %d", total_len);
net_pkt_set_ipv6_ext_len(pkt, total_len);
}
switch (next) {
case IPPROTO_ICMPV6:
return process_icmpv6_pkt(pkt, hdr);
case IPPROTO_UDP:
#if defined(CONFIG_NET_UDP)
return net_conn_input(IPPROTO_UDP, pkt);
#else
return NET_DROP;
#endif
case IPPROTO_TCP:
#if defined(CONFIG_NET_TCP)
return net_conn_input(IPPROTO_TCP, pkt);
#else
return NET_DROP;
#endif
}
drop:
return NET_DROP;
bad_hdr:
/* Send error message about parameter problem (RFC 2460)
*/
net_icmpv6_send_error(pkt, NET_ICMPV6_PARAM_PROBLEM,
NET_ICMPV6_PARAM_PROB_NEXTHEADER,
offset - 1);
NET_DBG("Unknown next header type");
net_stats_update_ip_errors_protoerr();
return NET_DROP;
}
void net_ipv6_init(void)
{
#if defined(CONFIG_NET_IPV6_NBR_CACHE)
net_icmpv6_register_handler(&ns_input_handler);
net_icmpv6_register_handler(&na_input_handler);
#endif
#if defined(CONFIG_NET_IPV6_ND)
net_icmpv6_register_handler(&ra_input_handler);
#endif
#if defined(CONFIG_NET_IPV6_MLD)
net_icmpv6_register_handler(&mld_query_input_handler);
#endif
}