484 lines
14 KiB
C
484 lines
14 KiB
C
/****************************************************************************
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* net/sixlowpan/sixlowpan_udpsend.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/socket.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include "nuttx/net/netdev.h"
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#include "nuttx/net/radiodev.h"
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#include "nuttx/net/netstats.h"
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#include "netdev/netdev.h"
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#include "socket/socket.h"
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#include "inet/inet.h"
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#include "icmpv6/icmpv6.h"
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#include "udp/udp.h"
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#include "utils/utils.h"
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#include "sixlowpan/sixlowpan_internal.h"
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#if defined(CONFIG_NET_6LOWPAN) && defined(CONFIG_NET_UDP)
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sixlowpan_udp_chksum
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*
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* Description:
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* Perform the checksum calculation over the IPv6, protocol headers, and
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* data payload as necessary.
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*
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* Input Parameters:
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* ipv6udp - A reference to a structure containing the IPv6 and UDP
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* headers.
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* buf - The beginning of the payload data
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* buflen - The length of the payload data.
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*
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* Returned Value:
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* The calculated checksum
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*
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****************************************************************************/
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#ifdef CONFIG_NET_UDP_CHECKSUMS
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static uint16_t sixlowpan_udp_chksum(FAR const struct ipv6udp_hdr_s *ipv6udp,
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FAR const uint8_t *buf, uint16_t buflen)
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{
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uint16_t upperlen;
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uint16_t sum;
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/* The length reported in the IPv6 header is the length of the payload
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* that follows the header.
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*/
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upperlen = ((uint16_t)ipv6udp->ipv6.len[0] << 8) + ipv6udp->ipv6.len[1];
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/* Verify some minimal assumptions */
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if (upperlen > CONFIG_NET_6LOWPAN_PKTSIZE)
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{
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return 0;
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}
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/* The checksum is calculated starting with a pseudo-header of IPv6 header
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* fields according to the IPv6 standard, which consists of the source
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* and destination addresses, the packet length and the next header field.
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*/
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sum = upperlen + ipv6udp->ipv6.proto;
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/* Sum IP source and destination addresses. */
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sum = chksum(sum, (FAR uint8_t *)ipv6udp->ipv6.srcipaddr,
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2 * sizeof(net_ipv6addr_t));
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/* Sum the UDP header */
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sum = chksum(sum, (FAR uint8_t *)&ipv6udp->udp, UDP_HDRLEN);
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/* Sum payload data. */
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sum = chksum(sum, buf, buflen);
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return (sum == 0) ? 0xffff : HTONS(sum);
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_6lowpan_udp_sendto
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*
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* Description:
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* If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
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* socket, the parameters to and 'tolen' are ignored (and the error EISCONN
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* may be returned when they are not NULL and 0), and the error ENOTCONN is
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* returned when the socket was not actually connected.
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*
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* Input Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* buf Data to send
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* buflen Length of data to send
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* flags Send flags
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* to Address of recipient
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* tolen The length of the address structure
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* -1 is returned, and errno is set appropriately. Returned error
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* number must be consistent with definition of errors reported by
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* sendto().
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*
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* Assumptions:
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* Called with the network locked.
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*
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****************************************************************************/
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ssize_t psock_6lowpan_udp_sendto(FAR struct socket *psock,
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FAR const void *buf,
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size_t buflen, int flags,
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FAR const struct sockaddr *to,
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socklen_t tolen)
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{
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FAR struct sockaddr_in6 *to6 = (FAR struct sockaddr_in6 *)to;
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FAR struct udp_conn_s *conn;
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FAR struct net_driver_s *dev;
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struct ipv6udp_hdr_s ipv6udp;
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struct netdev_varaddr_s destmac;
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uint16_t iplen;
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int ret;
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ninfo("buflen %lu\n", (unsigned long)buflen);
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DEBUGASSERT(to != NULL);
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DEBUGASSERT(psock->s_type == SOCK_DGRAM);
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sixlowpan_dumpbuffer("Outgoing UDP payload", buf, buflen);
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if (psock == NULL || to == NULL)
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{
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return (ssize_t)-EINVAL;
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}
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/* Make sure that this is a datagram valid socket */
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if (psock->s_conn == NULL || psock->s_type != SOCK_DGRAM)
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{
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nerr("ERROR: Invalid socket\n");
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return (ssize_t)-EBADF;
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}
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/* Make sure that the destination address is valid */
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if (to6->sin6_family != AF_INET6 || tolen < sizeof(struct sockaddr_in6))
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{
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nerr("ERROR: Invalid destination address: sin6_family=%u tolen = %u\n",
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to6->sin6_family, tolen);
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return (ssize_t)-EPROTOTYPE;
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}
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/* Get the underlying UDP "connection" structure */
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conn = psock->s_conn;
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DEBUGASSERT(conn != NULL);
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/* Route outgoing message to the correct device */
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dev = netdev_findby_ripv6addr(conn->u.ipv6.laddr,
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to6->sin6_addr.in6_u.u6_addr16);
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if (dev == NULL)
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{
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nwarn("WARNING: Not routable\n");
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return (ssize_t)-ENETUNREACH;
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}
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/* Some network devices support different link layer protocols.
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* Check if this device has the hooks to support 6LoWPAN.
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*/
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if (dev->d_lltype != NET_LL_IEEE802154 &&
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dev->d_lltype != NET_LL_PKTRADIO)
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{
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nwarn("WARNING: Not a compatible network device\n");
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return (ssize_t)-ENONET;
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}
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#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
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/* Make sure that the IP address mapping is in the Neighbor Table */
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ret = icmpv6_neighbor(dev, to6->sin6_addr.in6_u.u6_addr16);
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if (ret < 0)
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{
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nerr("ERROR: Not reachable\n");
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return (ssize_t)-ENETUNREACH;
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}
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#endif
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/* Initialize the IPv6/UDP headers */
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ipv6udp.ipv6.vtc = 0x60;
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ipv6udp.ipv6.tcf = 0x00;
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ipv6udp.ipv6.flow = 0x00;
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ipv6udp.ipv6.proto = IP_PROTO_UDP;
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ipv6udp.ipv6.ttl = conn->sconn.s_ttl;
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/* The IPv6 header length field does not include the size of IPv6 IP
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* header.
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*/
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iplen = buflen + UDP_HDRLEN;
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ipv6udp.ipv6.len[0] = (iplen >> 8);
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ipv6udp.ipv6.len[1] = (iplen & 0xff);
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/* Copy the source and destination addresses */
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net_ipv6addr_hdrcopy(ipv6udp.ipv6.destipaddr,
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to6->sin6_addr.in6_u.u6_addr16);
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if (!net_ipv6addr_cmp(conn->u.ipv6.laddr, g_ipv6_unspecaddr))
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{
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net_ipv6addr_hdrcopy(ipv6udp.ipv6.srcipaddr, conn->u.ipv6.laddr);
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}
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else
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{
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net_ipv6addr_hdrcopy(ipv6udp.ipv6.srcipaddr,
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netdev_ipv6_srcaddr(dev, ipv6udp.ipv6.destipaddr));
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}
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ninfo("IPv6 length: %d\n",
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((int)ipv6udp.ipv6.len[0] << 8) + ipv6udp.ipv6.len[1]);
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.ipv6.sent++;
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#endif
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/* Initialize the UDP header */
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ipv6udp.udp.srcport = conn->lport;
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ipv6udp.udp.destport = to6->sin6_port;
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ipv6udp.udp.udplen = HTONS(iplen);
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ipv6udp.udp.udpchksum = 0;
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#ifdef CONFIG_NET_UDP_CHECKSUMS
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ipv6udp.udp.udpchksum = ~sixlowpan_udp_chksum(&ipv6udp, buf, buflen);
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if (ipv6udp.udp.udpchksum == 0)
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{
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ipv6udp.udp.udpchksum = 0xffff;
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}
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#endif /* CONFIG_NET_UDP_CHECKSUMS */
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ninfo("Outgoing UDP packet length: %d\n", iplen + IPv6_HDRLEN);
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.udp.sent++;
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#endif
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/* Get the IEEE 802.15.4 MAC address of the next hop. */
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ret = sixlowpan_nexthopaddr((FAR struct radio_driver_s *)dev,
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to6->sin6_addr.in6_u.u6_addr16, &destmac);
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if (ret < 0)
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{
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nerr("ERROR: Failed to get dest MAC address: %d\n", ret);
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return (ssize_t)ret;
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}
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/* If routable, then call sixlowpan_send() to format and send the 6LoWPAN
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* packet.
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*/
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ret = sixlowpan_send(dev,
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&conn->sconn.list,
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&conn->sconn.list_tail,
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(FAR const struct ipv6_hdr_s *)&ipv6udp,
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buf, buflen, &destmac,
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_SO_TIMEOUT(conn->sconn.s_sndtimeo));
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if (ret < 0)
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{
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nerr("ERROR: sixlowpan_send() failed: %d\n", ret);
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}
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return (ssize_t)ret;
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}
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/****************************************************************************
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* Name: psock_6lowpan_udp_send
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*
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* Description:
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* psock_6lowpan_udp_send() call may be used with connectionlesss UDP
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* sockets.
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*
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* Input Parameters:
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* psock - An instance of the internal socket structure.
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* buf - Data to send
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* buflen - Length of data to send
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* -1 is returned, and errno is set appropriately. Returned error numbers
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* must be consistent with definition of errors reported by send().
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*
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* Assumptions:
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* Called with the network locked.
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*
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****************************************************************************/
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ssize_t psock_6lowpan_udp_send(FAR struct socket *psock, FAR const void *buf,
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size_t buflen)
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{
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FAR struct udp_conn_s *conn;
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struct sockaddr_in6 to;
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ninfo("buflen %lu\n", (unsigned long)buflen);
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DEBUGASSERT(psock->s_type == SOCK_DGRAM);
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sixlowpan_dumpbuffer("Outgoing UDP payload", buf, buflen);
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/* Make sure that this is a valid socket */
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if (psock == NULL || psock->s_conn == NULL)
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{
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nerr("ERROR: Invalid socket\n");
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return (ssize_t)-EBADF;
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}
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/* Get the underlying UDP "connection" structure */
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conn = psock->s_conn;
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/* Was the UDP socket connected via connect()? */
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if (psock->s_type != SOCK_DGRAM || !_SS_ISCONNECTED(conn->sconn.s_flags))
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{
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/* No, then it is not legal to call send() with this socket. */
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return -ENOTCONN;
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}
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/* Ignore if not IPv6 domain */
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if (conn->domain != PF_INET6)
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{
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nwarn("WARNING: Not IPv6\n");
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return (ssize_t)-EPROTOTYPE;
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}
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/* Create the 'to' address */
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to.sin6_family = AF_INET6;
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to.sin6_port = conn->rport; /* Already network order */
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memcpy(to.sin6_addr.in6_u.u6_addr16, conn->u.ipv6.raddr, 16);
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return psock_6lowpan_udp_sendto(psock, buf, buflen, 0,
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(FAR const struct sockaddr *)&to,
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sizeof(struct sockaddr_in6));
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}
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/****************************************************************************
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* Name: sixlowpan_udp_send
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*
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* Description:
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* Handles forwarding a UDP packet via 6LoWPAN. This is currently only
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* used by the IPv6 forwarding logic.
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*
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* Input Parameters:
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* dev - An instance of network device state structure
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* fwddev - The network device used to send the data. This will be the
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* same device except for the IP forwarding case where packets
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* are sent across devices.
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* ipv6 - A pointer to the IPv6 header in dev->d_buf which lies AFTER
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* the L1 header. NOTE: dev->d_len must have been decremented
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* by the size of any preceding MAC header.
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* Called with the network locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPFORWARD
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void sixlowpan_udp_send(FAR struct net_driver_s *dev,
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FAR struct net_driver_s *fwddev,
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FAR struct ipv6_hdr_s *ipv6)
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{
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FAR struct ipv6udp_hdr_s *ipv6udp = (FAR struct ipv6udp_hdr_s *)ipv6;
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/* Double check */
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DEBUGASSERT(dev != NULL && dev->d_len > 0 && fwddev != NULL);
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ninfo("d_len %u\n", dev->d_len);
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if (dev != NULL && dev->d_len > 0 && fwddev != NULL)
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{
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sixlowpan_dumpbuffer("Outgoing UDP packet",
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(FAR const uint8_t *)ipv6udp, dev->d_len);
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/* The UDP data payload should follow the IPv6 header plus the
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* protocol header.
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*/
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if (ipv6udp->ipv6.proto != IP_PROTO_UDP)
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{
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nwarn("WARNING: Expected UDP prototype: %u vs %u\n",
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ipv6udp->ipv6.proto, IP_PROTO_UDP);
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}
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else
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{
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struct netdev_varaddr_s destmac;
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FAR uint8_t *buf;
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uint16_t hdrlen;
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uint16_t buflen;
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int ret;
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/* Get the IEEE 802.15.4 MAC address of the next hop. */
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ret = sixlowpan_nexthopaddr((FAR struct radio_driver_s *)fwddev,
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ipv6udp->ipv6.destipaddr, &destmac);
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if (ret < 0)
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{
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nerr("ERROR: Failed to get dest MAC address: %d\n", ret);
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goto drop;
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}
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/* Get the IPv6 + UDP combined header length. */
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hdrlen = IPv6_HDRLEN + UDP_HDRLEN;
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/* Drop the packet if the buffer length is less than this. */
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if (hdrlen > dev->d_len)
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{
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nwarn("WARNING: Dropping small UDP packet: %u < %u\n",
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dev->d_len, hdrlen);
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}
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else
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{
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/* Convert the outgoing packet into a frame list. */
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buf = (FAR uint8_t *)ipv6 + hdrlen;
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buflen = dev->d_len - hdrlen;
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sixlowpan_queue_frames(
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(FAR struct radio_driver_s *)fwddev,
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&ipv6udp->ipv6, buf, buflen, &destmac);
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}
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}
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}
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drop:
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dev->d_len = 0;
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}
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#endif
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#endif /* CONFIG_NET_6LOWPAN && CONFIG_NET_UDP */
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