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zephyr/subsys/net/ip/connection.c

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/** @file
* @brief Generic connection related functions
*/
/*
* Copyright (c) 2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
/* TODO: Make core part of networking subsystem less dependent on
* UDP, TCP, IPv4 or IPv6. So that we can add new features with
* less cross-module changes.
*/
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(net_conn, CONFIG_NET_CONN_LOG_LEVEL);
#include <errno.h>
#include <zephyr/sys/util.h>
#include <zephyr/net/net_core.h>
#include <zephyr/net/net_pkt.h>
#include <zephyr/net/udp.h>
#include <zephyr/net/ethernet.h>
#include <zephyr/net/socketcan.h>
#include "net_private.h"
#include "icmpv6.h"
#include "icmpv4.h"
#include "udp_internal.h"
#include "tcp_internal.h"
#include "connection.h"
#include "net_stats.h"
/** How long to wait for when cloning multicast packet */
#define CLONE_TIMEOUT K_MSEC(100)
/** Is this connection used or not */
#define NET_CONN_IN_USE BIT(0)
/** Remote address set */
#define NET_CONN_REMOTE_ADDR_SET BIT(1)
/** Local address set */
#define NET_CONN_LOCAL_ADDR_SET BIT(2)
/** Local port set */
#define NET_CONN_REMOTE_PORT_SPEC BIT(3)
/** Remote port set */
#define NET_CONN_LOCAL_PORT_SPEC BIT(4)
/** Local address specified */
#define NET_CONN_REMOTE_ADDR_SPEC BIT(5)
/** Remote address specified */
#define NET_CONN_LOCAL_ADDR_SPEC BIT(6)
#define NET_CONN_RANK(_flags) (_flags & 0x78)
static struct net_conn conns[CONFIG_NET_MAX_CONN];
static sys_slist_t conn_unused;
static sys_slist_t conn_used;
#if (CONFIG_NET_CONN_LOG_LEVEL >= LOG_LEVEL_DBG)
static inline
void conn_register_debug(struct net_conn *conn,
uint16_t remote_port, uint16_t local_port)
{
char dst[NET_IPV6_ADDR_LEN];
char src[NET_IPV6_ADDR_LEN];
if (conn->flags & NET_CONN_REMOTE_ADDR_SET) {
if (IS_ENABLED(CONFIG_NET_IPV6) &&
conn->family == AF_INET6) {
snprintk(dst, sizeof(dst), "%s",
net_sprint_ipv6_addr(&net_sin6(&conn->remote_addr)->sin6_addr));
} else if (IS_ENABLED(CONFIG_NET_IPV4) &&
conn->family == AF_INET) {
snprintk(dst, sizeof(dst), "%s",
net_sprint_ipv4_addr(&net_sin(&conn->remote_addr)->sin_addr));
} else {
snprintk(dst, sizeof(dst), "%s", "?");
}
} else {
snprintk(dst, sizeof(dst), "%s", "-");
}
if (conn->flags & NET_CONN_LOCAL_ADDR_SET) {
if (IS_ENABLED(CONFIG_NET_IPV6) &&
conn->family == AF_INET6) {
snprintk(src, sizeof(src), "%s",
net_sprint_ipv6_addr(&net_sin6(&conn->local_addr)->sin6_addr));
} else if (IS_ENABLED(CONFIG_NET_IPV4) &&
conn->family == AF_INET) {
snprintk(src, sizeof(src), "%s",
net_sprint_ipv4_addr(&net_sin(&conn->local_addr)->sin_addr));
} else {
snprintk(src, sizeof(src), "%s", "?");
}
} else {
snprintk(src, sizeof(src), "%s", "-");
}
NET_DBG("[%p/%d/%u/0x%02x] remote %s/%u ",
conn, conn->proto, conn->family, conn->flags,
dst, remote_port);
NET_DBG(" local %s/%u cb %p ud %p",
src, local_port, conn->cb, conn->user_data);
}
#else
#define conn_register_debug(...)
#endif /* (CONFIG_NET_CONN_LOG_LEVEL >= LOG_LEVEL_DBG) */
static K_MUTEX_DEFINE(conn_lock);
static struct net_conn *conn_get_unused(void)
{
sys_snode_t *node;
k_mutex_lock(&conn_lock, K_FOREVER);
node = sys_slist_peek_head(&conn_unused);
if (!node) {
k_mutex_unlock(&conn_lock);
return NULL;
}
sys_slist_remove(&conn_unused, NULL, node);
k_mutex_unlock(&conn_lock);
return CONTAINER_OF(node, struct net_conn, node);
}
static void conn_set_used(struct net_conn *conn)
{
conn->flags |= NET_CONN_IN_USE;
k_mutex_lock(&conn_lock, K_FOREVER);
sys_slist_prepend(&conn_used, &conn->node);
k_mutex_unlock(&conn_lock);
}
static void conn_set_unused(struct net_conn *conn)
{
(void)memset(conn, 0, sizeof(*conn));
k_mutex_lock(&conn_lock, K_FOREVER);
sys_slist_prepend(&conn_unused, &conn->node);
k_mutex_unlock(&conn_lock);
}
/* Check if we already have identical connection handler installed. */
static struct net_conn *conn_find_handler(struct net_if *iface,
uint16_t proto, uint8_t family,
const struct sockaddr *remote_addr,
const struct sockaddr *local_addr,
uint16_t remote_port,
uint16_t local_port,
bool reuseport_set)
{
struct net_conn *conn;
struct net_conn *tmp;
k_mutex_lock(&conn_lock, K_FOREVER);
SYS_SLIST_FOR_EACH_CONTAINER_SAFE(&conn_used, conn, tmp, node) {
if (conn->proto != proto) {
continue;
}
if (conn->family != family) {
continue;
}
if (local_addr) {
if (!(conn->flags & NET_CONN_LOCAL_ADDR_SET)) {
continue;
}
if (IS_ENABLED(CONFIG_NET_IPV6) &&
local_addr->sa_family == AF_INET6 &&
local_addr->sa_family ==
conn->local_addr.sa_family) {
if (!net_ipv6_addr_cmp(
&net_sin6(local_addr)->sin6_addr,
&net_sin6(&conn->local_addr)->
sin6_addr)) {
continue;
}
} else if (IS_ENABLED(CONFIG_NET_IPV4) &&
local_addr->sa_family == AF_INET &&
local_addr->sa_family ==
conn->local_addr.sa_family) {
if (!net_ipv4_addr_cmp(
&net_sin(local_addr)->sin_addr,
&net_sin(&conn->local_addr)->
sin_addr)) {
continue;
}
} else {
continue;
}
} else if (conn->flags & NET_CONN_LOCAL_ADDR_SET) {
continue;
}
if (net_sin(&conn->local_addr)->sin_port !=
htons(local_port)) {
continue;
}
if (remote_addr) {
if (!(conn->flags & NET_CONN_REMOTE_ADDR_SET)) {
continue;
}
if (IS_ENABLED(CONFIG_NET_IPV6) &&
remote_addr->sa_family == AF_INET6 &&
remote_addr->sa_family ==
conn->remote_addr.sa_family) {
if (!net_ipv6_addr_cmp(
&net_sin6(remote_addr)->sin6_addr,
&net_sin6(&conn->remote_addr)->
sin6_addr)) {
continue;
}
} else if (IS_ENABLED(CONFIG_NET_IPV4) &&
remote_addr->sa_family == AF_INET &&
remote_addr->sa_family ==
conn->remote_addr.sa_family) {
if (!net_ipv4_addr_cmp(
&net_sin(remote_addr)->sin_addr,
&net_sin(&conn->remote_addr)->
sin_addr)) {
continue;
}
} else {
continue;
}
} else if (conn->flags & NET_CONN_REMOTE_ADDR_SET) {
continue;
} else if (reuseport_set && conn->context != NULL &&
net_context_is_reuseport_set(conn->context)) {
continue;
}
if (net_sin(&conn->remote_addr)->sin_port !=
htons(remote_port)) {
continue;
}
if (conn->context != NULL && iface != NULL &&
net_context_is_bound_to_iface(conn->context)) {
if (iface != net_context_get_iface(conn->context)) {
continue;
}
}
k_mutex_unlock(&conn_lock);
return conn;
}
k_mutex_unlock(&conn_lock);
return NULL;
}
static void net_conn_change_callback(struct net_conn *conn,
net_conn_cb_t cb, void *user_data)
{
NET_DBG("[%zu] connection handler %p changed callback",
conn - conns, conn);
conn->cb = cb;
conn->user_data = user_data;
}
static int net_conn_change_remote(struct net_conn *conn,
const struct sockaddr *remote_addr,
uint16_t remote_port)
{
NET_DBG("[%zu] connection handler %p changed remote",
conn - conns, conn);
if (remote_addr) {
if (IS_ENABLED(CONFIG_NET_IPV6) &&
remote_addr->sa_family == AF_INET6) {
memcpy(&conn->remote_addr, remote_addr,
sizeof(struct sockaddr_in6));
if (!net_ipv6_is_addr_unspecified(
&net_sin6(remote_addr)->
sin6_addr)) {
conn->flags |= NET_CONN_REMOTE_ADDR_SPEC;
}
} else if (IS_ENABLED(CONFIG_NET_IPV4) &&
remote_addr->sa_family == AF_INET) {
memcpy(&conn->remote_addr, remote_addr,
sizeof(struct sockaddr_in));
if (net_sin(remote_addr)->sin_addr.s_addr) {
conn->flags |= NET_CONN_REMOTE_ADDR_SPEC;
}
} else {
NET_ERR("Remote address family not set");
return -EINVAL;
}
conn->flags |= NET_CONN_REMOTE_ADDR_SET;
} else {
conn->flags &= ~NET_CONN_REMOTE_ADDR_SPEC;
conn->flags &= ~NET_CONN_REMOTE_ADDR_SET;
}
if (remote_port) {
conn->flags |= NET_CONN_REMOTE_PORT_SPEC;
net_sin(&conn->remote_addr)->sin_port = htons(remote_port);
} else {
conn->flags &= ~NET_CONN_REMOTE_PORT_SPEC;
}
return 0;
}
int net_conn_register(uint16_t proto, uint8_t family,
const struct sockaddr *remote_addr,
const struct sockaddr *local_addr,
uint16_t remote_port,
uint16_t local_port,
struct net_context *context,
net_conn_cb_t cb,
void *user_data,
struct net_conn_handle **handle)
{
struct net_conn *conn;
uint8_t flags = 0U;
int ret;
conn = conn_find_handler(context != NULL ? net_context_get_iface(context) : NULL,
proto, family, remote_addr, local_addr,
remote_port, local_port,
context != NULL ?
net_context_is_reuseport_set(context) :
false);
if (conn) {
NET_ERR("Identical connection handler %p already found.", conn);
return -EADDRINUSE;
}
conn = conn_get_unused();
if (!conn) {
return -ENOENT;
}
if (local_addr) {
if (IS_ENABLED(CONFIG_NET_IPV6) &&
local_addr->sa_family == AF_INET6) {
memcpy(&conn->local_addr, local_addr,
sizeof(struct sockaddr_in6));
if (!net_ipv6_is_addr_unspecified(
&net_sin6(local_addr)->
sin6_addr)) {
flags |= NET_CONN_LOCAL_ADDR_SPEC;
}
} else if (IS_ENABLED(CONFIG_NET_IPV4) &&
local_addr->sa_family == AF_INET) {
memcpy(&conn->local_addr, local_addr,
sizeof(struct sockaddr_in));
if (net_sin(local_addr)->sin_addr.s_addr) {
flags |= NET_CONN_LOCAL_ADDR_SPEC;
}
} else if (IS_ENABLED(CONFIG_NET_SOCKETS_CAN) &&
local_addr->sa_family == AF_CAN) {
memcpy(&conn->local_addr, local_addr,
sizeof(struct sockaddr_can));
} else if (IS_ENABLED(CONFIG_NET_SOCKETS_PACKET) &&
local_addr->sa_family == AF_PACKET) {
memcpy(&conn->local_addr, local_addr,
sizeof(struct sockaddr_ll));
} else {
NET_ERR("Local address family not set");
goto error;
}
flags |= NET_CONN_LOCAL_ADDR_SET;
}
if (remote_addr && local_addr) {
if (remote_addr->sa_family != local_addr->sa_family) {
NET_ERR("Address families different");
goto error;
}
}
if (local_port) {
flags |= NET_CONN_LOCAL_PORT_SPEC;
net_sin(&conn->local_addr)->sin_port = htons(local_port);
}
net_conn_change_callback(conn, cb, user_data);
conn->flags = flags;
conn->proto = proto;
conn->family = family;
conn->context = context;
/*
* Since the net_conn_change_remote() updates the flags in connection,
* must to be called after set the flags to connection.
*/
ret = net_conn_change_remote(conn, remote_addr, remote_port);
if (ret) {
goto error;
}
if (handle) {
*handle = (struct net_conn_handle *)conn;
}
conn_set_used(conn);
conn->v6only = net_context_is_v6only_set(context);
conn_register_debug(conn, remote_port, local_port);
return 0;
error:
conn_set_unused(conn);
return -EINVAL;
}
int net_conn_unregister(struct net_conn_handle *handle)
{
struct net_conn *conn = (struct net_conn *)handle;
if (conn < &conns[0] || conn > &conns[CONFIG_NET_MAX_CONN]) {
return -EINVAL;
}
if (!(conn->flags & NET_CONN_IN_USE)) {
return -ENOENT;
}
NET_DBG("Connection handler %p removed", conn);
k_mutex_lock(&conn_lock, K_FOREVER);
sys_slist_find_and_remove(&conn_used, &conn->node);
k_mutex_unlock(&conn_lock);
conn_set_unused(conn);
return 0;
}
int net_conn_update(struct net_conn_handle *handle,
net_conn_cb_t cb,
void *user_data,
const struct sockaddr *remote_addr,
uint16_t remote_port)
{
struct net_conn *conn = (struct net_conn *)handle;
int ret;
if (conn < &conns[0] || conn > &conns[CONFIG_NET_MAX_CONN]) {
return -EINVAL;
}
if (!(conn->flags & NET_CONN_IN_USE)) {
return -ENOENT;
}
net_conn_change_callback(conn, cb, user_data);
ret = net_conn_change_remote(conn, remote_addr, remote_port);
return ret;
}
static bool conn_addr_cmp(struct net_pkt *pkt,
union net_ip_header *ip_hdr,
struct sockaddr *addr,
bool is_remote)
{
if (addr->sa_family != net_pkt_family(pkt)) {
return false;
}
if (IS_ENABLED(CONFIG_NET_IPV6) &&
net_pkt_family(pkt) == AF_INET6 &&
addr->sa_family == AF_INET6) {
uint8_t *addr6;
if (is_remote) {
addr6 = ip_hdr->ipv6->src;
} else {
addr6 = ip_hdr->ipv6->dst;
}
if (!net_ipv6_is_addr_unspecified(
&net_sin6(addr)->sin6_addr)) {
if (!net_ipv6_addr_cmp_raw((uint8_t *)&net_sin6(addr)->sin6_addr,
addr6)) {
return false;
}
}
return true;
} else if (IS_ENABLED(CONFIG_NET_IPV4) &&
net_pkt_family(pkt) == AF_INET &&
addr->sa_family == AF_INET) {
uint8_t *addr4;
if (is_remote) {
addr4 = ip_hdr->ipv4->src;
} else {
addr4 = ip_hdr->ipv4->dst;
}
if (net_sin(addr)->sin_addr.s_addr) {
if (!net_ipv4_addr_cmp_raw((uint8_t *)&net_sin(addr)->sin_addr,
addr4)) {
return false;
}
}
}
return true;
}
static inline void conn_send_icmp_error(struct net_pkt *pkt)
{
if (IS_ENABLED(CONFIG_NET_DISABLE_ICMP_DESTINATION_UNREACHABLE)) {
return;
}
if (IS_ENABLED(CONFIG_NET_IPV6) && net_pkt_family(pkt) == AF_INET6) {
net_icmpv6_send_error(pkt, NET_ICMPV6_DST_UNREACH,
NET_ICMPV6_DST_UNREACH_NO_PORT, 0);
} else if (IS_ENABLED(CONFIG_NET_IPV4)) {
net_icmpv4_send_error(pkt, NET_ICMPV4_DST_UNREACH,
NET_ICMPV4_DST_UNREACH_NO_PORT);
}
}
static bool conn_are_endpoints_valid(struct net_pkt *pkt, uint8_t family,
union net_ip_header *ip_hdr,
uint16_t src_port, uint16_t dst_port)
{
bool is_my_src_addr;
bool is_same_src_and_dst_addr;
if (IS_ENABLED(CONFIG_NET_IPV4) && family == AF_INET) {
is_my_src_addr = net_ipv4_is_my_addr(
(struct in_addr *)ip_hdr->ipv4->src);
is_same_src_and_dst_addr = net_ipv4_addr_cmp_raw(
ip_hdr->ipv4->src, ip_hdr->ipv4->dst);
} else if (IS_ENABLED(CONFIG_NET_IPV6) && family == AF_INET6) {
is_my_src_addr = net_ipv6_is_my_addr(
(struct in6_addr *)ip_hdr->ipv6->src);
is_same_src_and_dst_addr = net_ipv6_addr_cmp_raw(
ip_hdr->ipv6->src, ip_hdr->ipv6->dst);
} else {
return true;
}
bool is_same_src_and_dst_port = src_port == dst_port;
bool are_invalid_endpoints =
(is_same_src_and_dst_addr || is_my_src_addr) && is_same_src_and_dst_port;
return !are_invalid_endpoints;
}
static enum net_verdict conn_raw_socket(struct net_pkt *pkt,
struct net_conn *conn, uint8_t proto)
{
if (proto == ETH_P_ALL) {
enum net_sock_type type = net_context_get_type(conn->context);
if ((type == SOCK_DGRAM && !net_pkt_is_l2_processed(pkt)) ||
(type == SOCK_RAW && net_pkt_is_l2_processed(pkt))) {
return NET_CONTINUE;
}
}
if (!(conn->flags & NET_CONN_LOCAL_ADDR_SET)) {
return NET_CONTINUE;
}
struct net_if *pkt_iface = net_pkt_iface(pkt);
struct sockaddr_ll *local;
struct net_pkt *raw_pkt;
local = (struct sockaddr_ll *)&conn->local_addr;
if (local->sll_ifindex != net_if_get_by_iface(pkt_iface)) {
return NET_CONTINUE;
}
NET_DBG("[%p] raw match found cb %p ud %p", conn, conn->cb,
conn->user_data);
raw_pkt = net_pkt_clone(pkt, CLONE_TIMEOUT);
if (!raw_pkt) {
net_stats_update_per_proto_drop(pkt_iface, proto);
NET_WARN("pkt cloning failed, pkt %p dropped", pkt);
return NET_DROP;
}
if (conn->cb(conn, raw_pkt, NULL, NULL, conn->user_data) == NET_DROP) {
net_stats_update_per_proto_drop(pkt_iface, proto);
net_pkt_unref(raw_pkt);
} else {
net_stats_update_per_proto_recv(pkt_iface, proto);
}
return NET_OK;
}
enum net_verdict net_conn_input(struct net_pkt *pkt,
union net_ip_header *ip_hdr,
uint8_t proto,
union net_proto_header *proto_hdr)
{
struct net_if *pkt_iface = net_pkt_iface(pkt);
uint8_t pkt_family = net_pkt_family(pkt);
uint16_t src_port = 0U, dst_port = 0U;
if (!net_pkt_filter_local_in_recv_ok(pkt)) {
/* drop the packet */
return NET_DROP;
}
if (IS_ENABLED(CONFIG_NET_IP) && (pkt_family == AF_INET || pkt_family == AF_INET6)) {
if (IS_ENABLED(CONFIG_NET_UDP) && proto == IPPROTO_UDP) {
src_port = proto_hdr->udp->src_port;
dst_port = proto_hdr->udp->dst_port;
} else if (IS_ENABLED(CONFIG_NET_TCP) && proto == IPPROTO_TCP) {
if (proto_hdr->tcp == NULL) {
return NET_DROP;
}
src_port = proto_hdr->tcp->src_port;
dst_port = proto_hdr->tcp->dst_port;
}
if (!conn_are_endpoints_valid(pkt, pkt_family, ip_hdr, src_port, dst_port)) {
NET_DBG("Dropping invalid src/dst end-points packet");
return NET_DROP;
}
} else if (IS_ENABLED(CONFIG_NET_SOCKETS_PACKET) && pkt_family == AF_PACKET) {
if (proto != ETH_P_ALL && proto != IPPROTO_RAW) {
return NET_DROP;
}
} else if (IS_ENABLED(CONFIG_NET_SOCKETS_CAN) && pkt_family == AF_CAN) {
if (proto != CAN_RAW) {
return NET_DROP;
}
} else {
NET_DBG("No suitable protocol handler configured");
return NET_DROP;
}
NET_DBG("Check %s listener for pkt %p src port %u dst port %u"
" family %d", net_proto2str(net_pkt_family(pkt), proto), pkt,
ntohs(src_port), ntohs(dst_port), net_pkt_family(pkt));
struct net_conn *best_match = NULL;
int16_t best_rank = -1;
bool is_mcast_pkt = false;
bool mcast_pkt_delivered = false;
bool is_bcast_pkt = false;
bool raw_pkt_delivered = false;
bool raw_pkt_continue = false;
struct net_conn *conn;
net_conn_cb_t cb = NULL;
void *user_data = NULL;
if (IS_ENABLED(CONFIG_NET_IP)) {
/* If we receive a packet with multicast destination address, we might
* need to deliver the packet to multiple recipients.
*/
if (IS_ENABLED(CONFIG_NET_IPV4) && pkt_family == AF_INET) {
if (net_ipv4_is_addr_mcast((struct in_addr *)ip_hdr->ipv4->dst)) {
is_mcast_pkt = true;
} else if (net_if_ipv4_is_addr_bcast(pkt_iface,
(struct in_addr *)ip_hdr->ipv4->dst)) {
is_bcast_pkt = true;
}
} else if (IS_ENABLED(CONFIG_NET_IPV6) && pkt_family == AF_INET6) {
is_mcast_pkt = net_ipv6_is_addr_mcast((struct in6_addr *)ip_hdr->ipv6->dst);
}
}
k_mutex_lock(&conn_lock, K_FOREVER);
SYS_SLIST_FOR_EACH_CONTAINER(&conn_used, conn, node) {
/* Is the candidate connection matching the packet's interface? */
if (conn->context != NULL &&
net_context_is_bound_to_iface(conn->context) &&
net_pkt_iface(pkt) != net_context_get_iface(conn->context)) {
continue; /* wrong interface */
}
/* Is the candidate connection matching the packet's protocol family? */
if (conn->family != AF_UNSPEC &&
conn->family != pkt_family) {
if (IS_ENABLED(CONFIG_NET_SOCKETS_PACKET)) {
/* If there are other listening connections than
* AF_PACKET, the packet shall be also passed back to
* net_conn_input() in upper layer processing in order to
* re-check if there is any listening socket interested
* in this packet.
*/
if (conn->family != AF_PACKET) {
raw_pkt_continue = true;
}
}
if (IS_ENABLED(CONFIG_NET_IPV4_MAPPING_TO_IPV6)) {
if (!(conn->family == AF_INET6 && pkt_family == AF_INET &&
!conn->v6only)) {
continue;
}
} else {
continue; /* wrong protocol family */
}
/* We might have a match for v4-to-v6 mapping, check more */
}
/* Is the candidate connection matching the packet's protocol wihin the family? */
if (conn->proto != proto) {
/* For packet socket data, the proto is set to ETH_P_ALL
* or IPPROTO_RAW but the listener might have a specific
* protocol set. This is ok and let the packet pass this
* check in this case.
*/
if (IS_ENABLED(CONFIG_NET_SOCKETS_PACKET) && pkt_family == AF_PACKET) {
if (proto != ETH_P_ALL && proto != IPPROTO_RAW) {
continue; /* wrong protocol */
}
} else {
continue; /* wrong protocol */
}
}
/* Apply protocol-specific matching criteria... */
uint8_t conn_family = conn->family;
if (IS_ENABLED(CONFIG_NET_SOCKETS_PACKET) && conn_family == AF_PACKET) {
/* This code shall be only executed when one enters
* the net_conn_input() from net_packet_socket() which
* targets AF_PACKET sockets.
*
* All AF_PACKET connections will receive the packet if
* their socket type and - in case of IPPROTO - protocol
* also matches.
*/
if (proto == ETH_P_ALL) {
/* We shall continue with ETH_P_ALL to IPPROTO_RAW: */
raw_pkt_continue = true;
}
/* With IPPROTO_RAW deliver only if protocol match: */
if ((proto == ETH_P_ALL && conn->proto != IPPROTO_RAW) ||
conn->proto == proto) {
enum net_verdict ret = conn_raw_socket(pkt, conn, proto);
if (ret == NET_DROP) {
k_mutex_unlock(&conn_lock);
goto drop;
} else if (ret == NET_OK) {
raw_pkt_delivered = true;
}
continue; /* packet was consumed */
}
} else if ((IS_ENABLED(CONFIG_NET_UDP) || IS_ENABLED(CONFIG_NET_TCP)) &&
(conn_family == AF_INET || conn_family == AF_INET6 ||
conn_family == AF_UNSPEC)) {
/* Is the candidate connection matching the packet's TCP/UDP
* address and port?
*/
if (net_sin(&conn->remote_addr)->sin_port &&
net_sin(&conn->remote_addr)->sin_port != src_port) {
continue; /* wrong remote port */
}
if (net_sin(&conn->local_addr)->sin_port &&
net_sin(&conn->local_addr)->sin_port != dst_port) {
continue; /* wrong local port */
}
if ((conn->flags & NET_CONN_REMOTE_ADDR_SET) &&
!conn_addr_cmp(pkt, ip_hdr, &conn->remote_addr, true)) {
continue; /* wrong remote address */
}
if ((conn->flags & NET_CONN_LOCAL_ADDR_SET) &&
!conn_addr_cmp(pkt, ip_hdr, &conn->local_addr, false)) {
/* Check if we could do a v4-mapping-to-v6 and the IPv6 socket
* has no IPV6_V6ONLY option set and if the local IPV6 address
* is unspecified, then we could accept a connection from IPv4
* address by mapping it to IPv6 address.
*/
if (IS_ENABLED(CONFIG_NET_IPV4_MAPPING_TO_IPV6)) {
if (!(conn->family == AF_INET6 && pkt_family == AF_INET &&
!conn->v6only &&
net_ipv6_is_addr_unspecified(
&net_sin6(&conn->local_addr)->sin6_addr))) {
continue; /* wrong local address */
}
} else {
continue; /* wrong local address */
}
/* We might have a match for v4-to-v6 mapping,
* continue with rank checking.
*/
}
if (best_rank < NET_CONN_RANK(conn->flags)) {
struct net_pkt *mcast_pkt;
if (!is_mcast_pkt) {
best_rank = NET_CONN_RANK(conn->flags);
best_match = conn;
continue; /* found a match - but maybe not yet the best */
}
/* If we have a multicast packet, and we found
* a match, then deliver the packet immediately
* to the handler. As there might be several
* sockets interested about these, we need to
* clone the received pkt.
*/
NET_DBG("[%p] mcast match found cb %p ud %p", conn, conn->cb,
conn->user_data);
mcast_pkt = net_pkt_clone(pkt, CLONE_TIMEOUT);
if (!mcast_pkt) {
k_mutex_unlock(&conn_lock);
goto drop;
}
if (conn->cb(conn, mcast_pkt, ip_hdr, proto_hdr, conn->user_data) ==
NET_DROP) {
net_stats_update_per_proto_drop(pkt_iface, proto);
net_pkt_unref(mcast_pkt);
} else {
net_stats_update_per_proto_recv(pkt_iface, proto);
}
mcast_pkt_delivered = true;
}
} else if (IS_ENABLED(CONFIG_NET_SOCKETS_CAN) && conn_family == AF_CAN) {
best_match = conn;
}
} /* loop end */
if (best_match) {
cb = best_match->cb;
user_data = best_match->user_data;
}
k_mutex_unlock(&conn_lock);
if (IS_ENABLED(CONFIG_NET_SOCKETS_PACKET) && pkt_family == AF_PACKET) {
if (raw_pkt_continue) {
/* When there is open connection different than
* AF_PACKET this packet shall be also handled in
* the upper net stack layers.
*/
return NET_CONTINUE;
}
if (raw_pkt_delivered) {
/* As one or more raw socket packets
* have already been delivered in the loop above,
* we shall not call the callback again here.
*/
net_pkt_unref(pkt);
return NET_OK;
}
}
if (IS_ENABLED(CONFIG_NET_IP) && is_mcast_pkt && mcast_pkt_delivered) {
/* As one or more multicast packets
* have already been delivered in the loop above,
* we shall not call the callback again here.
*/
net_pkt_unref(pkt);
return NET_OK;
}
if (cb) {
NET_DBG("[%p] match found cb %p ud %p rank 0x%02x", best_match, cb,
user_data, NET_CONN_RANK(best_match->flags));
if (cb(best_match, pkt, ip_hdr, proto_hdr, user_data)
== NET_DROP) {
goto drop;
}
net_stats_update_per_proto_recv(pkt_iface, proto);
return NET_OK;
}
NET_DBG("No match found.");
if (IS_ENABLED(CONFIG_NET_IP) && (pkt_family == AF_INET || pkt_family == AF_INET6) &&
!(is_mcast_pkt || is_bcast_pkt)) {
if (IS_ENABLED(CONFIG_NET_TCP) && proto == IPPROTO_TCP &&
IS_ENABLED(CONFIG_NET_TCP_REJECT_CONN_WITH_RST)) {
net_tcp_reply_rst(pkt);
net_stats_update_tcp_seg_connrst(pkt_iface);
} else {
conn_send_icmp_error(pkt);
}
}
drop:
net_stats_update_per_proto_drop(pkt_iface, proto);
return NET_DROP;
}
void net_conn_foreach(net_conn_foreach_cb_t cb, void *user_data)
{
struct net_conn *conn;
k_mutex_lock(&conn_lock, K_FOREVER);
SYS_SLIST_FOR_EACH_CONTAINER(&conn_used, conn, node) {
cb(conn, user_data);
}
k_mutex_unlock(&conn_lock);
}
void net_conn_init(void)
{
int i;
sys_slist_init(&conn_unused);
sys_slist_init(&conn_used);
for (i = 0; i < CONFIG_NET_MAX_CONN; i++) {
sys_slist_prepend(&conn_unused, &conns[i].node);
}
}
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