| /** @file |
| * @brief Network context API |
| * |
| * An API for applications to define a network connection. |
| */ |
| |
| /* |
| * Copyright (c) 2016 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #if defined(CONFIG_NET_DEBUG_CONTEXT) |
| #define SYS_LOG_DOMAIN "net/ctx" |
| #define NET_LOG_ENABLED 1 |
| #endif |
| |
| #include <kernel.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <stdbool.h> |
| |
| #include <net/nbuf.h> |
| #include <net/net_ip.h> |
| #include <net/net_context.h> |
| #include <net/offload_ip.h> |
| |
| #include "connection.h" |
| #include "net_private.h" |
| |
| #include "ipv6.h" |
| #include "ipv4.h" |
| #include "udp.h" |
| #include "tcp.h" |
| |
| #define NET_MAX_CONTEXT CONFIG_NET_MAX_CONTEXTS |
| |
| /* Declares a wrapper function for a net_conn callback that refs the |
| * context around the invocation (to protect it from premature |
| * deletion). Long term would be nice to see this feature be part of |
| * the connection type itself, but right now it has opaque "user_data" |
| * pointers and doesn't understand what a net_context is. |
| */ |
| #define NET_CONN_CB(name) \ |
| static enum net_verdict _##name(struct net_conn *conn, \ |
| struct net_buf *buf, \ |
| void *user_data); \ |
| static enum net_verdict name(struct net_conn *conn, \ |
| struct net_buf *buf, \ |
| void *user_data) \ |
| { \ |
| enum net_verdict result; \ |
| \ |
| net_context_ref(user_data); \ |
| result = _##name(conn, buf, user_data); \ |
| net_context_unref(user_data); \ |
| return result; \ |
| } \ |
| static enum net_verdict _##name(struct net_conn *conn, \ |
| struct net_buf *buf, \ |
| void *user_data) \ |
| |
| |
| static struct net_context contexts[NET_MAX_CONTEXT]; |
| |
| /* We need to lock the contexts array as these APIs are typically called |
| * from applications which are usually run in task context. |
| */ |
| static struct k_sem contexts_lock; |
| |
| enum net_verdict packet_received(struct net_conn *conn, |
| struct net_buf *buf, |
| void *user_data); |
| |
| static void set_appdata_values(struct net_buf *buf, |
| enum net_ip_protocol proto, |
| size_t total_len); |
| |
| #if defined(CONFIG_NET_TCP) |
| static struct sockaddr *create_sockaddr(struct net_buf *buf, |
| struct sockaddr *addr) |
| { |
| #if defined(CONFIG_NET_IPV6) |
| if (net_nbuf_family(buf) == AF_INET6) { |
| net_ipaddr_copy(&net_sin6(addr)->sin6_addr, |
| &NET_IPV6_BUF(buf)->src); |
| net_sin6(addr)->sin6_port = NET_TCP_BUF(buf)->src_port; |
| net_sin6(addr)->sin6_family = AF_INET6; |
| } else |
| #endif |
| |
| #if defined(CONFIG_NET_IPV4) |
| if (net_nbuf_family(buf) == AF_INET) { |
| net_ipaddr_copy(&net_sin(addr)->sin_addr, |
| &NET_IPV4_BUF(buf)->src); |
| net_sin(addr)->sin_port = NET_TCP_BUF(buf)->src_port; |
| net_sin(addr)->sin_family = AF_INET; |
| } else |
| #endif |
| { |
| return NULL; |
| } |
| |
| return addr; |
| } |
| #endif |
| |
| static int check_used_port(enum net_ip_protocol ip_proto, |
| uint16_t local_port, |
| const struct sockaddr *local_addr) |
| |
| { |
| int i; |
| |
| for (i = 0; i < NET_MAX_CONTEXT; i++) { |
| if (!net_context_is_used(&contexts[i])) { |
| continue; |
| } |
| |
| if (!(net_context_get_ip_proto(&contexts[i]) == ip_proto && |
| net_sin((struct sockaddr *)& |
| contexts[i].local)->sin_port == local_port)) { |
| continue; |
| } |
| |
| if (local_addr->family == AF_INET6) { |
| if (net_ipv6_addr_cmp( |
| net_sin6_ptr(&contexts[i].local)-> |
| sin6_addr, |
| &((struct sockaddr_in6 *) |
| local_addr)->sin6_addr)) { |
| return -EEXIST; |
| } |
| } else { |
| if (net_ipv4_addr_cmp( |
| net_sin_ptr(&contexts[i].local)-> |
| sin_addr, |
| &((struct sockaddr_in *) |
| local_addr)->sin_addr)) { |
| return -EEXIST; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static uint16_t find_available_port(struct net_context *context, |
| const struct sockaddr *addr) |
| { |
| if (!net_sin(addr)->sin_port) { |
| uint16_t local_port; |
| |
| do { |
| local_port = sys_rand32_get() | 0x8000; |
| if (local_port <= 1023) { |
| /* 0 - 1023 ports are reserved */ |
| continue; |
| } |
| } while (check_used_port( |
| net_context_get_ip_proto(context), |
| htons(local_port), addr) == -EEXIST); |
| |
| return htons(local_port); |
| } |
| |
| return net_sin(addr)->sin_port; |
| } |
| |
| int net_context_get(sa_family_t family, |
| enum net_sock_type type, |
| enum net_ip_protocol ip_proto, |
| struct net_context **context) |
| { |
| int i, ret = -ENOENT; |
| |
| #if defined(CONFIG_NET_CONTEXT_CHECK) |
| |
| #if !defined(CONFIG_NET_IPV4) |
| if (family == AF_INET) { |
| NET_ASSERT_INFO(family != AF_INET, "IPv4 disabled"); |
| return -EPFNOSUPPORT; |
| } |
| #endif |
| |
| #if !defined(CONFIG_NET_IPV6) |
| if (family == AF_INET6) { |
| NET_ASSERT_INFO(family != AF_INET6, "IPv6 disabled"); |
| return -EPFNOSUPPORT; |
| } |
| #endif |
| |
| #if !defined(CONFIG_NET_UDP) |
| if (type == SOCK_DGRAM) { |
| NET_ASSERT_INFO(type != SOCK_DGRAM, |
| "Datagram context disabled"); |
| return -EPROTOTYPE; |
| } |
| |
| if (ip_proto == IPPROTO_UDP) { |
| NET_ASSERT_INFO(ip_proto != IPPROTO_UDP, "UDP disabled"); |
| return -EPROTONOSUPPORT; |
| } |
| #endif |
| |
| #if !defined(CONFIG_NET_TCP) |
| if (type == SOCK_STREAM) { |
| NET_ASSERT_INFO(type != SOCK_STREAM, |
| "Stream context disabled"); |
| return -EPROTOTYPE; |
| } |
| |
| if (ip_proto == IPPROTO_TCP) { |
| NET_ASSERT_INFO(ip_proto != IPPROTO_TCP, "TCP disabled"); |
| return -EPROTONOSUPPORT; |
| } |
| #endif |
| |
| if (family != AF_INET && family != AF_INET6) { |
| NET_ASSERT_INFO(family == AF_INET || family == AF_INET6, |
| "Unknown address family %d", family); |
| return -EAFNOSUPPORT; |
| } |
| |
| if (type != SOCK_DGRAM && type != SOCK_STREAM) { |
| NET_ASSERT_INFO(type == SOCK_DGRAM || type == SOCK_STREAM, |
| "Unknown context type"); |
| return -EPROTOTYPE; |
| } |
| |
| if (ip_proto != IPPROTO_UDP && ip_proto != IPPROTO_TCP) { |
| NET_ASSERT_INFO(ip_proto == IPPROTO_UDP || |
| ip_proto == IPPROTO_TCP, |
| "Unknown IP protocol %d", ip_proto); |
| return -EPROTONOSUPPORT; |
| } |
| |
| if ((type == SOCK_STREAM && ip_proto == IPPROTO_UDP) || |
| (type == SOCK_DGRAM && ip_proto == IPPROTO_TCP)) { |
| NET_ASSERT_INFO(\ |
| (type != SOCK_STREAM || ip_proto != IPPROTO_UDP) && |
| (type != SOCK_DGRAM || ip_proto != IPPROTO_TCP), |
| "Context type and protocol mismatch, type %d proto %d", |
| type, ip_proto); |
| return -EOPNOTSUPP; |
| } |
| |
| if (!context) { |
| NET_ASSERT_INFO(context, "Invalid context"); |
| return -EINVAL; |
| } |
| #endif /* CONFIG_NET_CONTEXT_CHECK */ |
| |
| k_sem_take(&contexts_lock, K_FOREVER); |
| |
| for (i = 0; i < NET_MAX_CONTEXT; i++) { |
| if (net_context_is_used(&contexts[i])) { |
| continue; |
| } |
| |
| #if defined(CONFIG_NET_TCP) |
| if (ip_proto == IPPROTO_TCP) { |
| contexts[i].tcp = net_tcp_alloc(&contexts[i]); |
| if (!contexts[i].tcp) { |
| NET_ASSERT_INFO(contexts[i].tcp, |
| "Cannot allocate TCP context"); |
| return -ENOBUFS; |
| } |
| } |
| #endif /* CONFIG_NET_TCP */ |
| |
| contexts[i].flags = 0; |
| atomic_set(&contexts[i].refcount, 1); |
| |
| net_context_set_family(&contexts[i], family); |
| net_context_set_type(&contexts[i], type); |
| net_context_set_ip_proto(&contexts[i], ip_proto); |
| |
| contexts[i].flags |= NET_CONTEXT_IN_USE; |
| contexts[i].iface = 0; |
| |
| memset(&contexts[i].remote, 0, sizeof(struct sockaddr)); |
| memset(&contexts[i].local, 0, sizeof(struct sockaddr_ptr)); |
| |
| #if defined(CONFIG_NET_IPV6) |
| if (family == AF_INET6) { |
| struct sockaddr_in6 *addr6 = (struct sockaddr_in6 |
| *)&contexts[i].local; |
| addr6->sin6_port = find_available_port(&contexts[i], |
| (struct sockaddr *)addr6); |
| |
| if (!addr6->sin6_port) { |
| return -EADDRINUSE; |
| } |
| } |
| #endif |
| |
| #if defined(CONFIG_NET_IPV4) |
| if (family == AF_INET) { |
| struct sockaddr_in *addr = (struct sockaddr_in |
| *)&contexts[i].local; |
| addr->sin_port = find_available_port(&contexts[i], |
| (struct sockaddr *)addr); |
| |
| if (!addr->sin_port) { |
| return -EADDRINUSE; |
| } |
| } |
| #endif |
| |
| #if defined(CONFIG_NET_CONTEXT_SYNC_RECV) |
| k_sem_init(&contexts[i].recv_data_wait, 0, UINT_MAX); |
| k_sem_give(&contexts[i].recv_data_wait); |
| #endif /* CONFIG_NET_CONTEXT_SYNC_RECV */ |
| |
| *context = &contexts[i]; |
| |
| ret = 0; |
| break; |
| } |
| |
| k_sem_give(&contexts_lock); |
| |
| #if defined(CONFIG_NET_L2_OFFLOAD_IP) |
| /* FIXME - Figure out a way to get the correct network interface |
| * as it is not known at this point yet. |
| */ |
| if (!ret && net_if_is_ip_offloaded(net_if_get_default())) { |
| ret = net_l2_offload_ip_get(net_if_get_default(), |
| family, |
| type, |
| ip_proto, |
| context); |
| if (ret < 0) { |
| (*context)->flags &= ~NET_CONTEXT_IN_USE; |
| *context = NULL; |
| } |
| |
| return ret; |
| } |
| #endif /* CONFIG_NET_L2_OFFLOAD_IP */ |
| |
| return ret; |
| } |
| |
| #if defined(CONFIG_NET_TCP) |
| static void queue_fin(struct net_context *ctx) |
| { |
| struct net_buf *buf = NULL; |
| int ret; |
| |
| ret = net_tcp_prepare_segment(ctx->tcp, NET_TCP_FIN, NULL, 0, |
| NULL, &ctx->remote, &buf); |
| if (ret || !buf) { |
| return; |
| } |
| |
| ctx->tcp->fin_queued = 1; |
| |
| ret = net_tcp_send_buf(buf); |
| if (ret < 0) { |
| net_nbuf_unref(buf); |
| } |
| } |
| |
| #endif /* CONFIG_NET_TCP */ |
| |
| int net_context_ref(struct net_context *context) |
| { |
| int old_rc = atomic_inc(&context->refcount); |
| |
| return old_rc + 1; |
| } |
| |
| int net_context_unref(struct net_context *context) |
| { |
| int old_rc = atomic_dec(&context->refcount); |
| |
| if (old_rc != 1) { |
| return old_rc - 1; |
| } |
| |
| k_sem_take(&contexts_lock, K_FOREVER); |
| |
| #if defined(CONFIG_NET_TCP) |
| if (context->tcp) { |
| net_tcp_release(context->tcp); |
| } |
| #endif /* CONFIG_NET_TCP */ |
| |
| if (context->conn_handler) { |
| net_conn_unregister(context->conn_handler); |
| } |
| |
| context->flags &= ~NET_CONTEXT_IN_USE; |
| |
| k_sem_give(&contexts_lock); |
| |
| return 0; |
| } |
| |
| int net_context_put(struct net_context *context) |
| { |
| NET_ASSERT(context); |
| |
| if (!PART_OF_ARRAY(contexts, context)) { |
| return -EINVAL; |
| } |
| |
| #if defined(CONFIG_NET_L2_OFFLOAD_IP) |
| if (net_if_is_ip_offloaded(net_context_get_iface(context))) { |
| k_sem_take(&contexts_lock, K_FOREVER); |
| context->flags &= ~NET_CONTEXT_IN_USE; |
| return net_l2_offload_ip_put( |
| net_context_get_iface(context), context); |
| } |
| #endif /* CONFIG_NET_L2_OFFLOAD_IP */ |
| |
| context->connect_cb = NULL; |
| context->recv_cb = NULL; |
| context->send_cb = NULL; |
| |
| #if defined(CONFIG_NET_TCP) |
| if (net_context_get_ip_proto(context) == IPPROTO_TCP) { |
| if ((net_context_get_state(context) == NET_CONTEXT_CONNECTED || |
| net_context_get_state(context) == NET_CONTEXT_LISTENING) |
| && !context->tcp->fin_rcvd) { |
| NET_DBG("TCP connection in active close, not " |
| "disposing yet"); |
| queue_fin(context); |
| return 0; |
| } |
| } |
| #endif /* CONFIG_NET_TCP */ |
| |
| net_context_unref(context); |
| return 0; |
| } |
| |
| int net_context_bind(struct net_context *context, const struct sockaddr *addr, |
| socklen_t addrlen) |
| { |
| NET_ASSERT(addr); |
| NET_ASSERT(PART_OF_ARRAY(contexts, context)); |
| |
| #if defined(CONFIG_NET_IPV6) |
| if (addr->family == AF_INET6) { |
| struct net_if *iface = NULL; |
| struct in6_addr *ptr; |
| struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr; |
| int ret; |
| |
| if (addrlen < sizeof(struct sockaddr_in6)) { |
| return -EINVAL; |
| } |
| |
| if (net_is_ipv6_addr_mcast(&addr6->sin6_addr)) { |
| struct net_if_mcast_addr *maddr; |
| |
| maddr = net_if_ipv6_maddr_lookup(&addr6->sin6_addr, |
| &iface); |
| if (!maddr) { |
| return -ENOENT; |
| } |
| |
| ptr = &maddr->address.in6_addr; |
| |
| } else if (net_is_ipv6_addr_unspecified(&addr6->sin6_addr)) { |
| iface = net_if_get_default(); |
| |
| ptr = (struct in6_addr *)net_ipv6_unspecified_address(); |
| } else { |
| struct net_if_addr *ifaddr; |
| |
| ifaddr = net_if_ipv6_addr_lookup(&addr6->sin6_addr, |
| &iface); |
| if (!ifaddr) { |
| return -ENOENT; |
| } |
| |
| ptr = &ifaddr->address.in6_addr; |
| } |
| |
| if (!iface) { |
| NET_ERR("Cannot bind to %s", |
| net_sprint_ipv6_addr(&addr6->sin6_addr)); |
| |
| return -EADDRNOTAVAIL; |
| } |
| |
| #if defined(CONFIG_NET_L2_OFFLOAD_IP) |
| if (net_if_is_ip_offloaded(iface)) { |
| net_context_set_iface(context, iface); |
| |
| return net_l2_offload_ip_bind(iface, |
| context, |
| addr, |
| addrlen); |
| } |
| #endif /* CONFIG_NET_L2_OFFLOAD_IP */ |
| |
| net_context_set_iface(context, iface); |
| |
| net_sin6_ptr(&context->local)->sin6_family = AF_INET6; |
| net_sin6_ptr(&context->local)->sin6_addr = ptr; |
| if (addr6->sin6_port) { |
| ret = check_used_port(AF_INET6, addr6->sin6_port, |
| addr); |
| if (!ret) { |
| net_sin6_ptr(&context->local)->sin6_port = |
| addr6->sin6_port; |
| } else { |
| NET_ERR("Port %d is in use!", |
| ntohs(addr6->sin6_port)); |
| return ret; |
| } |
| } |
| |
| NET_DBG("Context %p binding to [%s]:%d iface %p", context, |
| net_sprint_ipv6_addr(ptr), ntohs(addr6->sin6_port), |
| iface); |
| |
| return 0; |
| } |
| #endif |
| |
| #if defined(CONFIG_NET_IPV4) |
| if (addr->family == AF_INET) { |
| struct sockaddr_in *addr4 = (struct sockaddr_in *)addr; |
| struct net_if_addr *ifaddr; |
| struct net_if *iface; |
| struct in_addr *ptr; |
| int ret; |
| |
| if (addrlen < sizeof(struct sockaddr_in)) { |
| return -EINVAL; |
| } |
| |
| if (addr4->sin_addr.s_addr[0] == INADDR_ANY) { |
| iface = net_if_get_default(); |
| |
| ptr = (struct in_addr *)net_ipv4_unspecified_address(); |
| } else { |
| ifaddr = net_if_ipv4_addr_lookup(&addr4->sin_addr, |
| &iface); |
| if (!ifaddr) { |
| return -ENOENT; |
| } |
| |
| ptr = &ifaddr->address.in_addr; |
| } |
| |
| if (!iface) { |
| NET_ERR("Cannot bind to %s", |
| net_sprint_ipv4_addr(&addr4->sin_addr)); |
| |
| return -EADDRNOTAVAIL; |
| } |
| |
| #if defined(CONFIG_NET_L2_OFFLOAD_IP) |
| if (net_if_is_ip_offloaded(iface)) { |
| net_context_set_iface(context, iface); |
| |
| return net_l2_offload_ip_bind(iface, |
| context, |
| addr, |
| addrlen); |
| } |
| #endif /* CONFIG_NET_L2_OFFLOAD_IP */ |
| |
| net_context_set_iface(context, iface); |
| |
| net_sin_ptr(&context->local)->sin_family = AF_INET; |
| net_sin_ptr(&context->local)->sin_addr = ptr; |
| if (addr4->sin_port) { |
| ret = check_used_port(AF_INET, addr4->sin_port, |
| addr); |
| if (!ret) { |
| net_sin_ptr(&context->local)->sin_port = |
| addr4->sin_port; |
| } else { |
| NET_ERR("Port %d is in use!", |
| ntohs(addr4->sin_port)); |
| return ret; |
| } |
| } |
| |
| NET_DBG("Context %p binding to %s:%d iface %p", context, |
| net_sprint_ipv4_addr(ptr), |
| ntohs(addr4->sin_port), iface); |
| |
| return 0; |
| } |
| #endif |
| |
| return -EINVAL; |
| } |
| |
| static inline struct net_context *find_context(void *conn_handler) |
| { |
| int i; |
| |
| for (i = 0; i < NET_MAX_CONTEXT; i++) { |
| if (!net_context_is_used(&contexts[i])) { |
| continue; |
| } |
| |
| if (contexts[i].conn_handler == conn_handler) { |
| return &contexts[i]; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| int net_context_listen(struct net_context *context, int backlog) |
| { |
| ARG_UNUSED(backlog); |
| |
| NET_ASSERT(PART_OF_ARRAY(contexts, context)); |
| |
| if (!net_context_is_used(context)) { |
| return -ENOENT; |
| } |
| |
| #if defined(CONFIG_NET_L2_OFFLOAD_IP) |
| if (net_if_is_ip_offloaded(net_context_get_iface(context))) { |
| return net_l2_offload_ip_listen( |
| net_context_get_iface(context), context, backlog); |
| } |
| #endif /* CONFIG_NET_L2_OFFLOAD_IP */ |
| |
| #if defined(CONFIG_NET_TCP) |
| if (net_context_get_ip_proto(context) == IPPROTO_TCP) { |
| net_tcp_change_state(context->tcp, NET_TCP_LISTEN); |
| net_context_set_state(context, NET_CONTEXT_LISTENING); |
| |
| return 0; |
| } |
| #endif |
| |
| return -EOPNOTSUPP; |
| } |
| |
| #if defined(CONFIG_NET_TCP) |
| #if defined(CONFIG_NET_DEBUG_CONTEXT) |
| #define net_tcp_print_recv_info(str, buf, port) \ |
| do { \ |
| if (net_context_get_family(context) == AF_INET6) { \ |
| NET_DBG("%s received from %s port %d", str, \ |
| net_sprint_ipv6_addr(&NET_IPV6_BUF(buf)->src),\ |
| ntohs(port)); \ |
| } else if (net_context_get_family(context) == AF_INET) {\ |
| NET_DBG("%s received from %s port %d", str, \ |
| net_sprint_ipv4_addr(&NET_IPV4_BUF(buf)->src),\ |
| ntohs(port)); \ |
| } \ |
| } while (0) |
| |
| #define net_tcp_print_send_info(str, buf, port) \ |
| do { \ |
| if (net_context_get_family(context) == AF_INET6) { \ |
| NET_DBG("%s sent to %s port %d", str, \ |
| net_sprint_ipv6_addr(&NET_IPV6_BUF(buf)->dst),\ |
| ntohs(port)); \ |
| } else if (net_context_get_family(context) == AF_INET) {\ |
| NET_DBG("%s sent to %s port %d", str, \ |
| net_sprint_ipv4_addr(&NET_IPV4_BUF(buf)->dst),\ |
| ntohs(port)); \ |
| } \ |
| } while (0) |
| #else |
| #define net_tcp_print_recv_info(...) |
| #define net_tcp_print_send_info(...) |
| #endif /* CONFIG_NET_DEBUG_CONTEXT */ |
| |
| static inline int send_control_segment(struct net_context *context, |
| const struct sockaddr_ptr *local, |
| const struct sockaddr *remote, |
| int flags, const char *msg) |
| { |
| struct net_buf *buf = NULL; |
| int ret; |
| |
| ret = net_tcp_prepare_segment(context->tcp, flags, NULL, 0, |
| local, remote, &buf); |
| if (ret) { |
| return ret; |
| } |
| |
| ret = net_send_data(buf); |
| if (ret < 0) { |
| net_nbuf_unref(buf); |
| } |
| |
| net_tcp_print_send_info(msg, buf, NET_TCP_BUF(buf)->dst_port); |
| |
| return ret; |
| } |
| |
| static inline int send_syn(struct net_context *context, |
| const struct sockaddr *remote) |
| { |
| net_tcp_change_state(context->tcp, NET_TCP_SYN_SENT); |
| |
| return send_control_segment(context, NULL, remote, NET_TCP_SYN, "SYN"); |
| } |
| |
| static inline int send_syn_ack(struct net_context *context, |
| struct sockaddr_ptr *local, |
| struct sockaddr *remote) |
| { |
| return send_control_segment(context, local, remote, |
| NET_TCP_SYN | NET_TCP_ACK, |
| "SYN_ACK"); |
| } |
| |
| static inline int send_ack(struct net_context *context, |
| struct sockaddr *remote) |
| { |
| struct net_buf *buf = NULL; |
| int ret; |
| |
| /* Something (e.g. a data transmission under the user |
| * callback) already sent the ACK, no need |
| */ |
| if (context->tcp->send_ack == context->tcp->sent_ack) { |
| return 0; |
| } |
| |
| ret = net_tcp_prepare_ack(context->tcp, remote, &buf); |
| if (ret) { |
| return ret; |
| } |
| |
| net_tcp_print_send_info("ACK", buf, NET_TCP_BUF(buf)->dst_port); |
| |
| ret = net_tcp_send_buf(buf); |
| if (ret < 0) { |
| net_nbuf_unref(buf); |
| } |
| |
| return ret; |
| } |
| |
| static int send_reset(struct net_context *context, |
| struct sockaddr *remote) |
| { |
| struct net_buf *buf = NULL; |
| int ret; |
| |
| ret = net_tcp_prepare_reset(context->tcp, remote, &buf); |
| if (ret) { |
| return ret; |
| } |
| |
| net_tcp_print_send_info("RST", buf, NET_TCP_BUF(buf)->dst_port); |
| |
| ret = net_send_data(buf); |
| if (ret < 0) { |
| net_nbuf_unref(buf); |
| } |
| |
| return ret; |
| } |
| |
| static int tcp_hdr_len(struct net_buf *buf) |
| { |
| /* "Offset": 4-bit field in high nibble, units of dwords */ |
| struct net_tcp_hdr *hdr = (void *)net_nbuf_tcp_data(buf); |
| |
| return 4 * (hdr->offset >> 4); |
| } |
| |
| /* This is called when we receive data after the connection has been |
| * established. The core TCP logic is located here. |
| */ |
| NET_CONN_CB(tcp_established) |
| { |
| struct net_context *context = (struct net_context *)user_data; |
| enum net_verdict ret; |
| uint8_t tcp_flags; |
| |
| NET_ASSERT(context && context->tcp); |
| |
| if (net_tcp_get_state(context->tcp) != NET_TCP_ESTABLISHED) { |
| NET_ERR("Context %p in wrong state %d", |
| context, net_tcp_get_state(context->tcp)); |
| return NET_DROP; |
| } |
| |
| net_tcp_print_recv_info("DATA", buf, NET_TCP_BUF(buf)->src_port); |
| |
| tcp_flags = NET_TCP_FLAGS(buf); |
| if (tcp_flags & NET_TCP_ACK) { |
| net_tcp_ack_received(context, |
| sys_get_be32(NET_TCP_BUF(buf)->ack)); |
| } |
| |
| if (sys_get_be32(NET_TCP_BUF(buf)->seq) - context->tcp->send_ack) { |
| /* Don't try to reorder packets. If it doesn't |
| * match the next segment exactly, drop and wait for |
| * retransmit |
| */ |
| return NET_DROP; |
| } |
| |
| set_appdata_values(buf, IPPROTO_TCP, net_buf_frags_len(buf)); |
| context->tcp->send_ack += net_nbuf_appdatalen(buf); |
| |
| ret = packet_received(conn, buf, context->tcp->recv_user_data); |
| |
| if (tcp_flags & NET_TCP_FIN) { |
| /* Sending an ACK in the CLOSE_WAIT state will transition to |
| * LAST_ACK state |
| */ |
| context->tcp->fin_rcvd = 1; |
| net_tcp_change_state(context->tcp, NET_TCP_CLOSE_WAIT); |
| |
| context->tcp->send_ack += 1; |
| |
| if (context->recv_cb) { |
| context->recv_cb(context, NULL, 0, |
| context->tcp->recv_user_data); |
| } |
| } |
| |
| send_ack(context, &conn->remote_addr); |
| |
| if (sys_slist_is_empty(&context->tcp->sent_list) |
| && context->tcp->fin_rcvd |
| && context->tcp->fin_sent) { |
| net_context_unref(context); |
| } |
| |
| return ret; |
| } |
| |
| |
| NET_CONN_CB(tcp_synack_received) |
| { |
| struct net_context *context = (struct net_context *)user_data; |
| int ret; |
| |
| NET_ASSERT(context && context->tcp); |
| |
| switch (net_tcp_get_state(context->tcp)) { |
| case NET_TCP_SYN_SENT: |
| net_context_set_iface(context, net_nbuf_iface(buf)); |
| break; |
| default: |
| NET_DBG("Context %p in wrong state %d", |
| context, net_tcp_get_state(context->tcp)); |
| return NET_DROP; |
| } |
| |
| net_nbuf_set_context(buf, context); |
| |
| NET_ASSERT(net_nbuf_iface(buf)); |
| |
| if (NET_TCP_FLAGS(buf) & NET_TCP_RST) { |
| if (context->connect_cb) { |
| context->connect_cb(context, -ECONNREFUSED, |
| context->user_data); |
| } |
| |
| return NET_DROP; |
| } |
| |
| if (NET_TCP_FLAGS(buf) & NET_TCP_SYN) { |
| context->tcp->send_ack = |
| sys_get_be32(NET_TCP_BUF(buf)->seq) + 1; |
| context->tcp->recv_max_ack = context->tcp->send_seq + 1; |
| } |
| /* |
| * If we receive SYN, we send SYN-ACK and go to SYN_RCVD state. |
| */ |
| if (NET_TCP_FLAGS(buf) == (NET_TCP_SYN | NET_TCP_ACK)) { |
| struct sockaddr *laddr; |
| struct sockaddr *raddr; |
| |
| #if defined(CONFIG_NET_IPV6) |
| struct sockaddr_in6 r6addr; |
| struct sockaddr_in6 l6addr; |
| #endif |
| #if defined(CONFIG_NET_IPV4) |
| struct sockaddr_in r4addr; |
| struct sockaddr_in l4addr; |
| #endif |
| |
| #if defined(CONFIG_NET_IPV6) |
| if (net_nbuf_family(buf) == AF_INET6) { |
| laddr = (struct sockaddr *)&l6addr; |
| raddr = (struct sockaddr *)&r6addr; |
| |
| r6addr.sin6_family = AF_INET6; |
| r6addr.sin6_port = NET_TCP_BUF(buf)->src_port; |
| net_ipaddr_copy(&r6addr.sin6_addr, |
| &NET_IPV6_BUF(buf)->src); |
| |
| l6addr.sin6_family = AF_INET6; |
| l6addr.sin6_port = NET_TCP_BUF(buf)->dst_port; |
| net_ipaddr_copy(&l6addr.sin6_addr, |
| &NET_IPV6_BUF(buf)->dst); |
| } else |
| #endif |
| #if defined(CONFIG_NET_IPV4) |
| if (net_nbuf_family(buf) == AF_INET) { |
| laddr = (struct sockaddr *)&l4addr; |
| raddr = (struct sockaddr *)&r4addr; |
| |
| r4addr.sin_family = AF_INET; |
| r4addr.sin_port = NET_TCP_BUF(buf)->src_port; |
| net_ipaddr_copy(&r4addr.sin_addr, |
| &NET_IPV4_BUF(buf)->src); |
| |
| l4addr.sin_family = AF_INET; |
| l4addr.sin_port = NET_TCP_BUF(buf)->dst_port; |
| net_ipaddr_copy(&l4addr.sin_addr, |
| &NET_IPV4_BUF(buf)->dst); |
| } else |
| #endif |
| { |
| NET_DBG("Invalid family (%d)", net_nbuf_family(buf)); |
| return NET_DROP; |
| } |
| |
| /* Remove the temporary connection handler and register |
| * a proper now as we have an established connection. |
| */ |
| net_tcp_unregister(context->conn_handler); |
| |
| ret = net_tcp_register(raddr, |
| laddr, |
| ntohs(NET_TCP_BUF(buf)->src_port), |
| ntohs(NET_TCP_BUF(buf)->dst_port), |
| tcp_established, |
| context, |
| &context->conn_handler); |
| if (ret < 0) { |
| NET_DBG("Cannot register TCP handler (%d)", ret); |
| send_reset(context, raddr); |
| return NET_DROP; |
| } |
| |
| net_tcp_change_state(context->tcp, NET_TCP_ESTABLISHED); |
| net_context_set_state(context, NET_CONTEXT_CONNECTED); |
| |
| send_ack(context, raddr); |
| |
| k_sem_give(&context->tcp->connect_wait); |
| |
| if (context->connect_cb) { |
| context->connect_cb(context, 0, context->user_data); |
| } |
| } |
| |
| return NET_DROP; |
| } |
| |
| #endif /* CONFIG_NET_TCP */ |
| |
| int net_context_connect(struct net_context *context, |
| const struct sockaddr *addr, |
| socklen_t addrlen, |
| net_context_connect_cb_t cb, |
| int32_t timeout, |
| void *user_data) |
| { |
| #if defined(CONFIG_NET_TCP) |
| struct sockaddr *laddr = NULL; |
| struct sockaddr local_addr; |
| uint16_t lport, rport; |
| int ret; |
| #endif |
| |
| NET_ASSERT(addr); |
| NET_ASSERT(PART_OF_ARRAY(contexts, context)); |
| #if defined(CONFIG_NET_TCP) |
| NET_ASSERT(context->tcp); |
| #endif |
| |
| if (!net_context_is_used(context)) { |
| return -ENOENT; |
| } |
| |
| if (addr->family != net_context_get_family(context)) { |
| NET_ASSERT_INFO(addr->family == \ |
| net_context_get_family(context), |
| "Family mismatch %d should be %d", |
| addr->family, |
| net_context_get_family(context)); |
| return -EINVAL; |
| } |
| |
| #if defined(CONFIG_NET_L2_OFFLOAD_IP) |
| if (net_if_is_ip_offloaded(net_context_get_iface(context))) { |
| return net_l2_offload_ip_connect( |
| net_context_get_iface(context), |
| context, |
| addr, |
| addrlen, |
| cb, |
| timeout, |
| user_data); |
| } |
| #endif /* CONFIG_NET_L2_OFFLOAD_IP */ |
| |
| if (net_context_get_state(context) == NET_CONTEXT_LISTENING) { |
| return -EOPNOTSUPP; |
| } |
| |
| #if defined(CONFIG_NET_IPV6) |
| if (net_context_get_family(context) == AF_INET6) { |
| struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) |
| &context->remote; |
| |
| if (addrlen < sizeof(struct sockaddr_in6)) { |
| return -EINVAL; |
| } |
| |
| #if defined(CONFIG_NET_TCP) |
| if (net_is_ipv6_addr_mcast(&addr6->sin6_addr)) { |
| return -EADDRNOTAVAIL; |
| } |
| #endif /* CONFIG_NET_TCP */ |
| |
| memcpy(&addr6->sin6_addr, &net_sin6(addr)->sin6_addr, |
| sizeof(struct in6_addr)); |
| |
| addr6->sin6_port = net_sin6(addr)->sin6_port; |
| addr6->sin6_family = AF_INET6; |
| |
| if (!net_is_ipv6_addr_unspecified(&addr6->sin6_addr)) { |
| context->flags |= NET_CONTEXT_REMOTE_ADDR_SET; |
| } else { |
| context->flags &= ~NET_CONTEXT_REMOTE_ADDR_SET; |
| } |
| |
| #if defined(CONFIG_NET_TCP) |
| rport = addr6->sin6_port; |
| |
| net_sin6_ptr(&context->local)->sin6_family = AF_INET6; |
| net_sin6(&local_addr)->sin6_family = AF_INET6; |
| net_sin6(&local_addr)->sin6_port = lport = |
| net_sin6((struct sockaddr *)&context->local)->sin6_port; |
| |
| if (net_sin6_ptr(&context->local)->sin6_addr) { |
| net_ipaddr_copy(&net_sin6(&local_addr)->sin6_addr, |
| net_sin6_ptr(&context->local)->sin6_addr); |
| |
| laddr = &local_addr; |
| } |
| #endif |
| } else |
| #endif /* CONFIG_NET_IPV6 */ |
| |
| #if defined(CONFIG_NET_IPV4) |
| if (net_context_get_family(context) == AF_INET) { |
| struct sockaddr_in *addr4 = (struct sockaddr_in *) |
| &context->remote; |
| |
| if (addrlen < sizeof(struct sockaddr_in)) { |
| return -EINVAL; |
| } |
| |
| #if defined(CONFIG_NET_TCP) |
| /* FIXME - Add multicast and broadcast address check */ |
| #endif /* CONFIG_NET_TCP */ |
| |
| memcpy(&addr4->sin_addr, &net_sin(addr)->sin_addr, |
| sizeof(struct in_addr)); |
| |
| addr4->sin_port = net_sin(addr)->sin_port; |
| addr4->sin_family = AF_INET; |
| |
| if (addr4->sin_addr.s_addr[0]) { |
| context->flags |= NET_CONTEXT_REMOTE_ADDR_SET; |
| } else { |
| context->flags &= ~NET_CONTEXT_REMOTE_ADDR_SET; |
| } |
| |
| #if defined(CONFIG_NET_TCP) |
| rport = addr4->sin_port; |
| |
| net_sin_ptr(&context->local)->sin_family = AF_INET; |
| net_sin(&local_addr)->sin_family = AF_INET; |
| net_sin(&local_addr)->sin_port = lport = |
| net_sin((struct sockaddr *)&context->local)->sin_port; |
| |
| if (net_sin_ptr(&context->local)->sin_addr) { |
| net_ipaddr_copy(&net_sin(&local_addr)->sin_addr, |
| net_sin_ptr(&context->local)->sin_addr); |
| |
| laddr = &local_addr; |
| } |
| #endif |
| } else |
| #endif /* CONFIG_NET_IPV4 */ |
| |
| { |
| return -EINVAL; /* Not IPv4 or IPv6 */ |
| } |
| |
| #if defined(CONFIG_NET_UDP) |
| if (net_context_get_type(context) == SOCK_DGRAM) { |
| if (cb) { |
| cb(context, 0, user_data); |
| } |
| |
| return 0; |
| } |
| #endif /* CONFIG_NET_UDP */ |
| |
| #if defined(CONFIG_NET_TCP) |
| if (net_context_get_type(context) != SOCK_STREAM) { |
| return -ENOTSUP; |
| } |
| |
| /* We need to register a handler, otherwise the SYN-ACK |
| * packet would not be received. |
| */ |
| ret = net_tcp_register(addr, |
| laddr, |
| ntohs(rport), |
| ntohs(lport), |
| tcp_synack_received, |
| context, |
| &context->conn_handler); |
| if (ret < 0) { |
| return ret; |
| } |
| |
| net_context_set_state(context, NET_CONTEXT_CONNECTING); |
| |
| send_syn(context, addr); |
| |
| context->connect_cb = cb; |
| context->user_data = user_data; |
| |
| /* in tcp_synack_received() we give back this semaphore */ |
| if (timeout != 0 && k_sem_take(&context->tcp->connect_wait, timeout)) { |
| return -ETIMEDOUT; |
| } |
| #endif |
| |
| return 0; |
| } |
| |
| #if defined(CONFIG_NET_TCP) |
| |
| #define ACK_TIMEOUT MSEC_PER_SEC |
| |
| static void ack_timeout(struct k_work *work) |
| { |
| /* This means that we did not receive ACK response in time. */ |
| struct net_tcp *tcp = CONTAINER_OF(work, struct net_tcp, ack_timer); |
| |
| NET_DBG("Did not receive ACK in %dms", ACK_TIMEOUT); |
| |
| send_reset(tcp->context, &tcp->context->remote); |
| |
| net_tcp_change_state(tcp, NET_TCP_LISTEN); |
| } |
| |
| static void buf_get_sockaddr(sa_family_t family, struct net_buf *buf, |
| struct sockaddr_ptr *addr) |
| { |
| memset(addr, 0, sizeof(*addr)); |
| |
| #if defined(CONFIG_NET_IPV4) |
| if (family == AF_INET) { |
| struct sockaddr_in_ptr *addr4 = net_sin_ptr(addr); |
| |
| addr4->sin_family = AF_INET; |
| addr4->sin_port = NET_TCP_BUF(buf)->dst_port; |
| addr4->sin_addr = &NET_IPV4_BUF(buf)->dst; |
| } |
| #endif |
| |
| #if defined(CONFIG_NET_IPV6) |
| if (family == AF_INET6) { |
| struct sockaddr_in6_ptr *addr6 = net_sin6_ptr(addr); |
| |
| addr6->sin6_family = AF_INET6; |
| addr6->sin6_port = NET_TCP_BUF(buf)->dst_port; |
| addr6->sin6_addr = &NET_IPV6_BUF(buf)->dst; |
| } |
| #endif |
| } |
| |
| /* This callback is called when we are waiting connections and we receive |
| * a packet. We need to check if we are receiving proper msg (SYN) here. |
| * The ACK could also be received, in which case we have an established |
| * connection. |
| */ |
| NET_CONN_CB(tcp_syn_rcvd) |
| { |
| struct net_context *context = (struct net_context *)user_data; |
| struct net_tcp *tcp; |
| struct sockaddr_ptr buf_src_addr; |
| |
| NET_ASSERT(context && context->tcp); |
| |
| tcp = context->tcp; |
| |
| switch (net_tcp_get_state(tcp)) { |
| case NET_TCP_LISTEN: |
| net_context_set_iface(context, net_nbuf_iface(buf)); |
| break; |
| case NET_TCP_SYN_RCVD: |
| if (net_nbuf_iface(buf) != net_context_get_iface(context)) { |
| return NET_DROP; |
| } |
| break; |
| default: |
| NET_DBG("Context %p in wrong state %d", |
| context, tcp->state); |
| return NET_DROP; |
| } |
| |
| net_nbuf_set_context(buf, context); |
| |
| NET_ASSERT(net_nbuf_iface(buf)); |
| |
| /* |
| * If we receive SYN, we send SYN-ACK and go to SYN_RCVD state. |
| */ |
| if (NET_TCP_FLAGS(buf) == NET_TCP_SYN) { |
| struct sockaddr peer, *remote; |
| |
| net_tcp_print_recv_info("SYN", buf, NET_TCP_BUF(buf)->src_port); |
| |
| net_tcp_change_state(tcp, NET_TCP_SYN_RCVD); |
| |
| remote = create_sockaddr(buf, &peer); |
| |
| /* FIXME: Is this the correct place to set tcp->send_ack? */ |
| context->tcp->send_ack = |
| sys_get_be32(NET_TCP_BUF(buf)->seq) + 1; |
| context->tcp->recv_max_ack = context->tcp->send_seq + 1; |
| |
| buf_get_sockaddr(net_context_get_family(context), |
| buf, &buf_src_addr); |
| send_syn_ack(context, &buf_src_addr, remote); |
| |
| /* We might be entering this section multiple times |
| * if the SYN is sent more than once. So we need to cancel |
| * any pending timers. |
| */ |
| k_delayed_work_cancel(&tcp->ack_timer); |
| k_delayed_work_init(&tcp->ack_timer, ack_timeout); |
| k_delayed_work_submit(&tcp->ack_timer, ACK_TIMEOUT); |
| |
| return NET_DROP; |
| } |
| |
| /* |
| * If we receive RST, we go back to LISTEN state. |
| */ |
| if (NET_TCP_FLAGS(buf) == NET_TCP_RST) { |
| k_delayed_work_cancel(&tcp->ack_timer); |
| |
| net_tcp_print_recv_info("RST", buf, NET_TCP_BUF(buf)->src_port); |
| |
| net_tcp_change_state(tcp, NET_TCP_LISTEN); |
| |
| return NET_DROP; |
| } |
| |
| /* |
| * If we receive ACK, we go to ESTABLISHED state. |
| */ |
| if (NET_TCP_FLAGS(buf) == NET_TCP_ACK) { |
| struct net_context *new_context; |
| struct sockaddr local_addr; |
| struct sockaddr remote_addr; |
| struct net_tcp *tmp_tcp; |
| socklen_t addrlen; |
| int ret; |
| |
| /* We can only receive ACK if we have already received SYN. |
| * So if we are not in SYN_RCVD state, then it is an error. |
| */ |
| if (net_tcp_get_state(tcp) != NET_TCP_SYN_RCVD) { |
| k_delayed_work_cancel(&tcp->ack_timer); |
| NET_DBG("Not in SYN_RCVD state, sending RST"); |
| goto reset; |
| } |
| |
| net_tcp_print_recv_info("ACK", buf, NET_TCP_BUF(buf)->src_port); |
| |
| if (!context->tcp->accept_cb) { |
| NET_DBG("No accept callback, connection reset."); |
| goto reset; |
| } |
| |
| /* We create a new context that starts to wait data. |
| */ |
| ret = net_context_get(net_nbuf_family(buf), |
| SOCK_STREAM, IPPROTO_TCP, |
| &new_context); |
| if (ret < 0) { |
| NET_DBG("Cannot get accepted context, " |
| "connection reset"); |
| goto reset; |
| } |
| |
| new_context->tcp->recv_max_ack = context->tcp->recv_max_ack; |
| new_context->tcp->send_seq = context->tcp->send_seq; |
| new_context->tcp->send_ack = context->tcp->send_ack; |
| |
| #if defined(CONFIG_NET_IPV6) |
| if (net_context_get_family(context) == AF_INET6) { |
| struct sockaddr_in6 *local_addr6 = |
| net_sin6(&local_addr); |
| struct sockaddr_in6 *remote_addr6 = |
| net_sin6(&remote_addr); |
| |
| remote_addr6->sin6_family = AF_INET6; |
| local_addr6->sin6_family = AF_INET6; |
| |
| local_addr6->sin6_port = NET_TCP_BUF(buf)->dst_port; |
| remote_addr6->sin6_port = NET_TCP_BUF(buf)->src_port; |
| |
| net_ipaddr_copy(&local_addr6->sin6_addr, |
| &NET_IPV6_BUF(buf)->dst); |
| net_ipaddr_copy(&remote_addr6->sin6_addr, |
| &NET_IPV6_BUF(buf)->src); |
| addrlen = sizeof(struct sockaddr_in6); |
| } else |
| #endif /* CONFIG_NET_IPV6 */ |
| |
| #if defined(CONFIG_NET_IPV4) |
| if (net_context_get_family(context) == AF_INET) { |
| struct sockaddr_in *local_addr4 = |
| net_sin(&local_addr); |
| struct sockaddr_in *remote_addr4 = |
| net_sin(&remote_addr); |
| |
| remote_addr4->sin_family = AF_INET; |
| local_addr4->sin_family = AF_INET; |
| |
| local_addr4->sin_port = NET_TCP_BUF(buf)->dst_port; |
| remote_addr4->sin_port = NET_TCP_BUF(buf)->src_port; |
| |
| net_ipaddr_copy(&local_addr4->sin_addr, |
| &NET_IPV4_BUF(buf)->dst); |
| net_ipaddr_copy(&remote_addr4->sin_addr, |
| &NET_IPV4_BUF(buf)->src); |
| addrlen = sizeof(struct sockaddr_in); |
| } else |
| #endif /* CONFIG_NET_IPV4 */ |
| { |
| NET_ASSERT_INFO(false, "Invalid protocol family %d", |
| net_context_get_family(context)); |
| net_context_unref(new_context); |
| return NET_DROP; |
| } |
| |
| ret = net_context_bind(new_context, &local_addr, |
| sizeof(local_addr)); |
| if (ret < 0) { |
| NET_DBG("Cannot bind accepted context, " |
| "connection reset"); |
| net_context_unref(new_context); |
| goto reset; |
| } |
| |
| new_context->flags |= NET_CONTEXT_REMOTE_ADDR_SET; |
| |
| memcpy(&new_context->remote, &remote_addr, |
| sizeof(remote_addr)); |
| |
| ret = net_tcp_register(&new_context->remote, |
| &local_addr, |
| ntohs(net_sin(&new_context->remote)->sin_port), |
| ntohs(net_sin(&local_addr)->sin_port), |
| tcp_established, |
| new_context, |
| &new_context->conn_handler); |
| if (ret < 0) { |
| NET_DBG("Cannot register accepted TCP handler (%d)", |
| ret); |
| net_context_unref(new_context); |
| goto reset; |
| } |
| |
| /* Swap the newly-created TCP states with the one that |
| * was used to establish this connection. The new TCP |
| * must be listening to accept other connections. |
| */ |
| tmp_tcp = new_context->tcp; |
| tmp_tcp->accept_cb = tcp->accept_cb; |
| tcp->accept_cb = NULL; |
| new_context->tcp = tcp; |
| context->tcp = tmp_tcp; |
| |
| tcp->context = new_context; |
| tmp_tcp->context = context; |
| |
| net_tcp_change_state(tmp_tcp, NET_TCP_LISTEN); |
| |
| net_tcp_change_state(new_context->tcp, NET_TCP_ESTABLISHED); |
| net_context_set_state(new_context, NET_CONTEXT_CONNECTED); |
| |
| k_delayed_work_cancel(&tcp->ack_timer); |
| |
| context->tcp->accept_cb(new_context, |
| &new_context->remote, |
| addrlen, |
| 0, |
| context->user_data); |
| } |
| |
| return NET_DROP; |
| |
| reset: |
| { |
| struct sockaddr peer; |
| |
| send_reset(tcp->context, create_sockaddr(buf, &peer)); |
| } |
| |
| return NET_DROP; |
| } |
| |
| #endif /* CONFIG_NET_TCP */ |
| |
| int net_context_accept(struct net_context *context, |
| net_tcp_accept_cb_t cb, |
| int32_t timeout, |
| void *user_data) |
| { |
| #if defined(CONFIG_NET_TCP) |
| struct sockaddr local_addr; |
| struct sockaddr *laddr = NULL; |
| uint16_t lport = 0; |
| int ret; |
| #endif /* CONFIG_NET_TCP */ |
| |
| NET_ASSERT(PART_OF_ARRAY(contexts, context)); |
| |
| if (!net_context_is_used(context)) { |
| return -ENOENT; |
| } |
| |
| #if defined(CONFIG_NET_L2_OFFLOAD_IP) |
| if (net_if_is_ip_offloaded(net_context_get_iface(context))) { |
| return net_l2_offload_ip_accept( |
| net_context_get_iface(context), |
| context, |
| cb, |
| timeout, |
| user_data); |
| } |
| #endif /* CONFIG_NET_L2_OFFLOAD_IP */ |
| |
| if ((net_context_get_state(context) != NET_CONTEXT_LISTENING) && |
| (net_context_get_type(context) != SOCK_STREAM)) { |
| NET_DBG("Invalid socket, state %d type %d", |
| net_context_get_state(context), |
| net_context_get_type(context)); |
| return -EINVAL; |
| } |
| |
| #if defined(CONFIG_NET_TCP) |
| if (net_context_get_ip_proto(context) == IPPROTO_TCP) { |
| NET_ASSERT(context->tcp); |
| |
| if (net_tcp_get_state(context->tcp) != NET_TCP_LISTEN) { |
| NET_DBG("Context %p in wrong state %d, should be %d", |
| context, context->tcp->state, NET_TCP_LISTEN); |
| return -EINVAL; |
| } |
| } |
| |
| local_addr.family = net_context_get_family(context); |
| |
| #if defined(CONFIG_NET_IPV6) |
| if (net_context_get_family(context) == AF_INET6) { |
| if (net_sin6_ptr(&context->local)->sin6_addr) { |
| net_ipaddr_copy(&net_sin6(&local_addr)->sin6_addr, |
| net_sin6_ptr(&context->local)->sin6_addr); |
| |
| laddr = &local_addr; |
| } |
| |
| net_sin6(&local_addr)->sin6_port = |
| net_sin6((struct sockaddr *)&context->local)->sin6_port; |
| } |
| #endif /* CONFIG_NET_IPV6 */ |
| |
| #if defined(CONFIG_NET_IPV4) |
| if (net_context_get_family(context) == AF_INET) { |
| if (net_sin_ptr(&context->local)->sin_addr) { |
| net_ipaddr_copy(&net_sin(&local_addr)->sin_addr, |
| net_sin_ptr(&context->local)->sin_addr); |
| |
| laddr = &local_addr; |
| } |
| |
| lport = net_sin((struct sockaddr *)&context->local)->sin_port; |
| } |
| #endif /* CONFIG_NET_IPV4 */ |
| |
| ret = net_tcp_register(context->flags & NET_CONTEXT_REMOTE_ADDR_SET ? |
| &context->remote : NULL, |
| laddr, |
| ntohs(net_sin(&context->remote)->sin_port), |
| ntohs(lport), |
| tcp_syn_rcvd, |
| context, |
| &context->conn_handler); |
| if (ret < 0) { |
| return ret; |
| } |
| |
| context->user_data = user_data; |
| |
| /* accept callback is only valid for TCP contexts */ |
| if (net_context_get_ip_proto(context) == IPPROTO_TCP) { |
| context->tcp->accept_cb = cb; |
| } |
| #endif /* CONFIG_NET_TCP */ |
| |
| return 0; |
| } |
| |
| static int send_data(struct net_context *context, |
| struct net_buf *buf, |
| net_context_send_cb_t cb, |
| int32_t timeout, |
| void *token, |
| void *user_data) |
| { |
| context->send_cb = cb; |
| context->user_data = user_data; |
| net_nbuf_set_token(buf, token); |
| |
| if (!timeout || net_context_get_ip_proto(context) == IPPROTO_UDP) { |
| return net_send_data(buf); |
| } |
| |
| #if defined(CONFIG_NET_TCP) |
| if (net_context_get_ip_proto(context) == IPPROTO_TCP) { |
| int ret = net_tcp_send_data(context); |
| |
| /* Just make the callback synchronously even if it didn't |
| * go over the wire. In theory it would be nice to track |
| * specific ACK locations in the stream and make the |
| * callback at that time, but there's nowhere to store the |
| * potentially-separate token/user_data values right now. |
| */ |
| if (cb) { |
| cb(context, ret, token, user_data); |
| } |
| |
| return ret; |
| } |
| #endif |
| |
| return -EPROTONOSUPPORT; |
| } |
| |
| #if defined(CONFIG_NET_UDP) |
| static int create_udp_packet(struct net_context *context, |
| struct net_buf *buf, |
| const struct sockaddr *dst_addr, |
| struct net_buf **out_buf) |
| { |
| #if defined(CONFIG_NET_IPV6) |
| if (net_nbuf_family(buf) == AF_INET6) { |
| struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)dst_addr; |
| |
| buf = net_ipv6_create(context, buf, NULL, &addr6->sin6_addr); |
| buf = net_udp_append(context, buf, ntohs(addr6->sin6_port)); |
| buf = net_ipv6_finalize(context, buf); |
| } else |
| #endif /* CONFIG_NET_IPV6 */ |
| |
| #if defined(CONFIG_NET_IPV4) |
| if (net_nbuf_family(buf) == AF_INET) { |
| struct sockaddr_in *addr4 = (struct sockaddr_in *)dst_addr; |
| |
| buf = net_ipv4_create(context, buf, NULL, &addr4->sin_addr); |
| buf = net_udp_append(context, buf, ntohs(addr4->sin_port)); |
| buf = net_ipv4_finalize(context, buf); |
| } else |
| #endif /* CONFIG_NET_IPV4 */ |
| { |
| return -EPROTONOSUPPORT; |
| } |
| |
| *out_buf = buf; |
| |
| return 0; |
| } |
| #endif /* CONFIG_NET_UDP */ |
| |
| static int sendto(struct net_buf *buf, |
| const struct sockaddr *dst_addr, |
| socklen_t addrlen, |
| net_context_send_cb_t cb, |
| int32_t timeout, |
| void *token, |
| void *user_data) |
| { |
| struct net_context *context = net_nbuf_context(buf); |
| int ret; |
| |
| if (!net_context_is_used(context)) { |
| return -ENOENT; |
| } |
| |
| #if defined(CONFIG_NET_TCP) |
| if (net_context_get_ip_proto(context) == IPPROTO_TCP) { |
| if (net_context_get_state(context) != NET_CONTEXT_CONNECTED) { |
| return -ENOTCONN; |
| } |
| |
| NET_ASSERT(context->tcp); |
| if (context->tcp->flags & NET_TCP_IS_SHUTDOWN) { |
| return -ESHUTDOWN; |
| } |
| } |
| #endif /* CONFIG_NET_TCP */ |
| |
| if (!dst_addr) { |
| return -EDESTADDRREQ; |
| } |
| |
| #if defined(CONFIG_NET_L2_OFFLOAD_IP) |
| if (net_if_is_ip_offloaded(net_nbuf_iface(buf))) { |
| return net_l2_offload_ip_sendto( |
| net_nbuf_iface(buf), |
| buf, dst_addr, addrlen, |
| cb, timeout, token, user_data); |
| } |
| #endif /* CONFIG_NET_L2_OFFLOAD_IP */ |
| |
| #if defined(CONFIG_NET_IPV6) |
| if (net_nbuf_family(buf) == AF_INET6) { |
| struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)dst_addr; |
| |
| if (addrlen < sizeof(struct sockaddr_in6)) { |
| return -EINVAL; |
| } |
| |
| if (net_is_ipv6_addr_unspecified(&addr6->sin6_addr)) { |
| return -EDESTADDRREQ; |
| } |
| } else |
| #endif /* CONFIG_NET_IPV6 */ |
| |
| #if defined(CONFIG_NET_IPV4) |
| if (net_nbuf_family(buf) == AF_INET) { |
| struct sockaddr_in *addr4 = (struct sockaddr_in *)dst_addr; |
| |
| if (addrlen < sizeof(struct sockaddr_in)) { |
| return -EINVAL; |
| } |
| |
| if (!addr4->sin_addr.s_addr[0]) { |
| return -EDESTADDRREQ; |
| } |
| } else |
| #endif /* CONFIG_NET_IPV4 */ |
| { |
| NET_DBG("Invalid protocol family %d", net_nbuf_family(buf)); |
| return -EINVAL; |
| } |
| |
| #if defined(CONFIG_NET_UDP) |
| if (net_context_get_ip_proto(context) == IPPROTO_UDP) { |
| ret = create_udp_packet(context, buf, dst_addr, &buf); |
| } else |
| #endif /* CONFIG_NET_UDP */ |
| |
| #if defined(CONFIG_NET_TCP) |
| if (net_context_get_ip_proto(context) == IPPROTO_TCP) { |
| ret = net_tcp_queue_data(context, buf); |
| } else |
| #endif /* CONFIG_NET_TCP */ |
| { |
| NET_DBG("Unknown protocol while sending packet: %d", |
| net_context_get_ip_proto(context)); |
| return -EPROTONOSUPPORT; |
| } |
| |
| if (ret < 0) { |
| NET_DBG("Could not create network packet to send"); |
| return ret; |
| } |
| |
| return send_data(context, buf, cb, timeout, token, user_data); |
| } |
| |
| int net_context_send(struct net_buf *buf, |
| net_context_send_cb_t cb, |
| int32_t timeout, |
| void *token, |
| void *user_data) |
| { |
| struct net_context *context = net_nbuf_context(buf); |
| socklen_t addrlen; |
| |
| NET_ASSERT(PART_OF_ARRAY(contexts, context)); |
| |
| #if defined(CONFIG_NET_L2_OFFLOAD_IP) |
| if (net_if_is_ip_offloaded(net_nbuf_iface(buf))) { |
| return net_l2_offload_ip_send( |
| net_nbuf_iface(buf), |
| buf, cb, timeout, |
| token, user_data); |
| } |
| #endif /* CONFIG_NET_L2_OFFLOAD_IP */ |
| |
| if (!(context->flags & NET_CONTEXT_REMOTE_ADDR_SET) || |
| !net_sin(&context->remote)->sin_port) { |
| return -EDESTADDRREQ; |
| } |
| |
| #if defined(CONFIG_NET_IPV6) |
| if (net_nbuf_family(buf) == AF_INET6) { |
| addrlen = sizeof(struct sockaddr_in6); |
| } else |
| #endif /* CONFIG_NET_IPV6 */ |
| |
| #if defined(CONFIG_NET_IPV4) |
| if (net_nbuf_family(buf) == AF_INET) { |
| addrlen = sizeof(struct sockaddr_in); |
| } else |
| #endif /* CONFIG_NET_IPV4 */ |
| { |
| addrlen = 0; |
| } |
| |
| return sendto(buf, &context->remote, addrlen, cb, timeout, token, |
| user_data); |
| } |
| |
| int net_context_sendto(struct net_buf *buf, |
| const struct sockaddr *dst_addr, |
| socklen_t addrlen, |
| net_context_send_cb_t cb, |
| int32_t timeout, |
| void *token, |
| void *user_data) |
| { |
| #if defined(CONFIG_NET_TCP) |
| struct net_context *context = net_nbuf_context(buf); |
| |
| NET_ASSERT(PART_OF_ARRAY(contexts, context)); |
| |
| if (net_context_get_ip_proto(context) == IPPROTO_TCP) { |
| /* Match POSIX behavior and ignore dst_address and addrlen */ |
| return net_context_send(buf, cb, timeout, token, user_data); |
| } |
| #endif /* CONFIG_NET_TCP */ |
| |
| return sendto(buf, dst_addr, addrlen, cb, timeout, token, user_data); |
| } |
| |
| static void set_appdata_values(struct net_buf *buf, |
| enum net_ip_protocol proto, |
| size_t total_len) |
| { |
| #if defined(CONFIG_NET_UDP) |
| if (proto == IPPROTO_UDP) { |
| net_nbuf_set_appdata(buf, net_nbuf_udp_data(buf) + |
| sizeof(struct net_udp_hdr)); |
| net_nbuf_set_appdatalen(buf, total_len - |
| net_nbuf_ip_hdr_len(buf) - |
| sizeof(struct net_udp_hdr)); |
| } else |
| #endif /* CONFIG_NET_UDP */ |
| |
| #if defined(CONFIG_NET_TCP) |
| if (proto == IPPROTO_TCP) { |
| net_nbuf_set_appdata(buf, net_nbuf_udp_data(buf) + |
| tcp_hdr_len(buf)); |
| net_nbuf_set_appdatalen(buf, total_len - |
| net_nbuf_ip_hdr_len(buf) - |
| tcp_hdr_len(buf)); |
| } else |
| #endif /* CONFIG_NET_TCP */ |
| { |
| net_nbuf_set_appdata(buf, net_nbuf_ip_data(buf) + |
| net_nbuf_ip_hdr_len(buf)); |
| net_nbuf_set_appdatalen(buf, total_len - |
| net_nbuf_ip_hdr_len(buf)); |
| } |
| |
| NET_ASSERT_INFO(net_nbuf_appdatalen(buf) < total_len, |
| "Wrong appdatalen %u, total %zu", |
| net_nbuf_appdatalen(buf), total_len); |
| } |
| |
| enum net_verdict packet_received(struct net_conn *conn, |
| struct net_buf *buf, |
| void *user_data) |
| { |
| struct net_context *context = find_context(conn); |
| |
| NET_ASSERT(context); |
| |
| net_context_set_iface(context, net_nbuf_iface(buf)); |
| |
| net_nbuf_set_context(buf, context); |
| |
| NET_ASSERT(net_nbuf_iface(buf)); |
| |
| if (context->recv_cb) { |
| size_t total_len = net_buf_frags_len(buf); |
| |
| /* TCP packets get appdata earlier in tcp_established() */ |
| if (net_context_get_ip_proto(context) != IPPROTO_TCP) { |
| if (net_nbuf_family(buf) == AF_INET6) { |
| set_appdata_values(buf, |
| NET_IPV6_BUF(buf)->nexthdr, |
| total_len); |
| } else { |
| set_appdata_values(buf, |
| NET_IPV4_BUF(buf)->proto, |
| total_len); |
| } |
| } |
| |
| NET_DBG("Set appdata %p to len %u (total %zu)", |
| net_nbuf_appdata(buf), net_nbuf_appdatalen(buf), |
| total_len); |
| |
| context->recv_cb(context, buf, 0, user_data); |
| |
| #if defined(CONFIG_NET_CONTEXT_SYNC_RECV) |
| k_sem_give(&context->recv_data_wait); |
| #endif /* CONFIG_NET_CONTEXT_SYNC_RECV */ |
| |
| return NET_OK; |
| } |
| |
| /* If there is no callback registered, then we can only drop |
| * the packet. |
| */ |
| return NET_DROP; |
| } |
| |
| #if defined(CONFIG_NET_UDP) |
| static int recv_udp(struct net_context *context, |
| net_context_recv_cb_t cb, |
| int32_t timeout, |
| void *user_data) |
| { |
| struct sockaddr local_addr = { |
| .family = net_context_get_family(context), |
| }; |
| struct sockaddr *laddr = NULL; |
| uint16_t lport = 0; |
| int ret; |
| |
| ARG_UNUSED(timeout); |
| |
| if (context->conn_handler) { |
| net_conn_unregister(context->conn_handler); |
| context->conn_handler = NULL; |
| } |
| |
| #if defined(CONFIG_NET_IPV6) |
| if (net_context_get_family(context) == AF_INET6) { |
| if (net_sin6_ptr(&context->local)->sin6_addr) { |
| net_ipaddr_copy(&net_sin6(&local_addr)->sin6_addr, |
| net_sin6_ptr(&context->local)->sin6_addr); |
| |
| laddr = &local_addr; |
| } |
| |
| net_sin6(&local_addr)->sin6_port = |
| net_sin6((struct sockaddr *)&context->local)->sin6_port; |
| lport = net_sin6((struct sockaddr *)&context->local)->sin6_port; |
| } |
| #endif /* CONFIG_NET_IPV6 */ |
| |
| #if defined(CONFIG_NET_IPV4) |
| if (net_context_get_family(context) == AF_INET) { |
| if (net_sin_ptr(&context->local)->sin_addr) { |
| net_ipaddr_copy(&net_sin(&local_addr)->sin_addr, |
| net_sin_ptr(&context->local)->sin_addr); |
| |
| laddr = &local_addr; |
| } |
| |
| lport = net_sin((struct sockaddr *)&context->local)->sin_port; |
| } |
| #endif /* CONFIG_NET_IPV4 */ |
| |
| context->recv_cb = cb; |
| |
| ret = net_conn_register(net_context_get_ip_proto(context), |
| context->flags & NET_CONTEXT_REMOTE_ADDR_SET ? |
| &context->remote : NULL, |
| laddr, |
| ntohs(net_sin(&context->remote)->sin_port), |
| ntohs(lport), |
| packet_received, |
| user_data, |
| &context->conn_handler); |
| |
| return ret; |
| } |
| #endif /* CONFIG_NET_UDP */ |
| |
| int net_context_recv(struct net_context *context, |
| net_context_recv_cb_t cb, |
| int32_t timeout, |
| void *user_data) |
| { |
| NET_ASSERT(context); |
| |
| if (!net_context_is_used(context)) { |
| return -ENOENT; |
| } |
| |
| #if defined(CONFIG_NET_L2_OFFLOAD_IP) |
| if (net_if_is_ip_offloaded(net_context_get_iface(context))) { |
| return net_l2_offload_ip_recv( |
| net_context_get_iface(context), |
| context, cb, timeout, user_data); |
| } |
| #endif /* CONFIG_NET_L2_OFFLOAD_IP */ |
| |
| #if defined(CONFIG_NET_UDP) |
| if (net_context_get_ip_proto(context) == IPPROTO_UDP) { |
| int ret = recv_udp(context, cb, timeout, user_data); |
| if (ret < 0) { |
| return ret; |
| } |
| } else |
| #endif /* CONFIG_NET_UDP */ |
| |
| #if defined(CONFIG_NET_TCP) |
| if (net_context_get_ip_proto(context) == IPPROTO_TCP) { |
| NET_ASSERT(context->tcp); |
| |
| if (context->tcp->flags & NET_TCP_IS_SHUTDOWN) { |
| return -ESHUTDOWN; |
| } else if (net_context_get_state(context) |
| != NET_CONTEXT_CONNECTED) { |
| return -ENOTCONN; |
| } |
| |
| context->recv_cb = cb; |
| context->tcp->recv_user_data = user_data; |
| } else |
| #endif /* CONFIG_NET_TCP */ |
| { |
| return -EPROTOTYPE; |
| } |
| |
| #if defined(CONFIG_NET_CONTEXT_SYNC_RECV) |
| if (timeout) { |
| /* Make sure we have the lock, then the packet_received() |
| * callback will release the semaphore when data has been |
| * received. |
| */ |
| while (k_sem_take(&context->recv_data_wait, K_NO_WAIT)) { |
| ; |
| } |
| |
| if (!k_sem_take(&context->recv_data_wait, timeout)) { |
| /* timeout */ |
| return -ETIMEDOUT; |
| } |
| } |
| #endif /* CONFIG_NET_CONTEXT_SYNC_RECV */ |
| |
| return 0; |
| } |
| |
| void net_context_foreach(net_context_cb_t cb, void *user_data) |
| { |
| int i; |
| |
| k_sem_take(&contexts_lock, K_FOREVER); |
| |
| for (i = 0; i < NET_MAX_CONTEXT; i++) { |
| if (!net_context_is_used(&contexts[i])) { |
| continue; |
| } |
| |
| cb(&contexts[i], user_data); |
| } |
| |
| k_sem_give(&contexts_lock); |
| } |
| |
| void net_context_init(void) |
| { |
| k_sem_init(&contexts_lock, 0, UINT_MAX); |
| |
| k_sem_give(&contexts_lock); |
| } |