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nuttx/net/sixlowpan/sixlowpan_udpsend.c

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/****************************************************************************
* net/sixlowpan/sixlowpan_udpsend.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/socket.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include "nuttx/net/netdev.h"
#include "nuttx/net/radiodev.h"
#include "nuttx/net/netstats.h"
#include "netdev/netdev.h"
#include "socket/socket.h"
#include "inet/inet.h"
#include "icmpv6/icmpv6.h"
#include "udp/udp.h"
#include "utils/utils.h"
#include "sixlowpan/sixlowpan_internal.h"
#if defined(CONFIG_NET_6LOWPAN) && defined(CONFIG_NET_UDP)
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: sixlowpan_udp_chksum
*
* Description:
* Perform the checksum calculation over the IPv6, protocol headers, and
* data payload as necessary.
*
* Input Parameters:
* ipv6udp - A reference to a structure containing the IPv6 and UDP
* headers.
* buf - The beginning of the payload data
* buflen - The length of the payload data.
*
* Returned Value:
* The calculated checksum
*
****************************************************************************/
#ifdef CONFIG_NET_UDP_CHECKSUMS
static uint16_t sixlowpan_udp_chksum(FAR const struct ipv6udp_hdr_s *ipv6udp,
FAR const uint8_t *buf, uint16_t buflen)
{
uint16_t upperlen;
uint16_t sum;
/* The length reported in the IPv6 header is the length of the payload
* that follows the header.
*/
upperlen = ((uint16_t)ipv6udp->ipv6.len[0] << 8) + ipv6udp->ipv6.len[1];
/* Verify some minimal assumptions */
if (upperlen > CONFIG_NET_6LOWPAN_PKTSIZE)
{
return 0;
}
/* The checksum is calculated starting with a pseudo-header of IPv6 header
* fields according to the IPv6 standard, which consists of the source
* and destination addresses, the packet length and the next header field.
*/
sum = upperlen + ipv6udp->ipv6.proto;
/* Sum IP source and destination addresses. */
sum = chksum(sum, (FAR uint8_t *)ipv6udp->ipv6.srcipaddr,
2 * sizeof(net_ipv6addr_t));
/* Sum the UDP header */
sum = chksum(sum, (FAR uint8_t *)&ipv6udp->udp, UDP_HDRLEN);
/* Sum payload data. */
sum = chksum(sum, buf, buflen);
return (sum == 0) ? 0xffff : htons(sum);
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: psock_6lowpan_udp_sendto
*
* Description:
* If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
* socket, the parameters to and 'tolen' are ignored (and the error EISCONN
* may be returned when they are not NULL and 0), and the error ENOTCONN is
* returned when the socket was not actually connected.
*
* Input Parameters:
* psock A pointer to a NuttX-specific, internal socket structure
* buf Data to send
* buflen Length of data to send
* flags Send flags
* to Address of recipient
* tolen The length of the address structure
*
* Returned Value:
* On success, returns the number of characters sent. On error,
* -1 is returned, and errno is set appropriately. Returned error
* number must be consistent with definition of errors reported by
* sendto().
*
* Assumptions:
* Called with the network locked.
*
****************************************************************************/
ssize_t psock_6lowpan_udp_sendto(FAR struct socket *psock,
FAR const void *buf,
size_t buflen, int flags,
FAR const struct sockaddr *to,
socklen_t tolen)
{
FAR struct sockaddr_in6 *to6 = (FAR struct sockaddr_in6 *)to;
FAR struct udp_conn_s *conn;
FAR struct net_driver_s *dev;
struct ipv6udp_hdr_s ipv6udp;
struct netdev_varaddr_s destmac;
uint16_t iplen;
int ret;
ninfo("buflen %lu\n", (unsigned long)buflen);
DEBUGASSERT(psock != NULL && psock->s_crefs > 0 && to != NULL);
DEBUGASSERT(psock->s_type == SOCK_DGRAM);
sixlowpan_dumpbuffer("Outgoing UDP payload", buf, buflen);
if (psock == NULL || to == NULL)
{
return (ssize_t)-EINVAL;
}
/* Make sure that this is a datagram valid socket */
if (psock->s_crefs <= 0 || psock->s_type != SOCK_DGRAM)
{
nerr("ERROR: Invalid socket\n");
return (ssize_t)-EBADF;
}
/* Make sure that the destination address is valid */
if (to6->sin6_family != AF_INET6 || tolen < sizeof(struct sockaddr_in6))
{
nerr("ERROR: Invalid destination address: sin6_family=%u tolen = %u\n",
to6->sin6_family, tolen);
return (ssize_t)-EPROTOTYPE;
}
/* Get the underlying UDP "connection" structure */
conn = (FAR struct udp_conn_s *)psock->s_conn;
DEBUGASSERT(conn != NULL);
/* Route outgoing message to the correct device */
dev = netdev_findby_ripv6addr(conn->u.ipv6.laddr,
to6->sin6_addr.in6_u.u6_addr16);
if (dev == NULL)
{
nwarn("WARNING: Not routable\n");
return (ssize_t)-ENETUNREACH;
}
/* Some network devices support different link layer protocols.
* Check if this device has the hooks to support 6LoWPAN.
*/
if (dev->d_lltype != NET_LL_IEEE802154 &&
dev->d_lltype != NET_LL_PKTRADIO)
{
nwarn("WARNING: Not a compatible network device\n");
return (ssize_t)-ENONET;
}
#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
/* Make sure that the IP address mapping is in the Neighbor Table */
ret = icmpv6_neighbor(to6->sin6_addr.in6_u.u6_addr16);
if (ret < 0)
{
nerr("ERROR: Not reachable\n");
return (ssize_t)-ENETUNREACH;
}
#endif
/* Initialize the IPv6/UDP headers */
ipv6udp.ipv6.vtc = 0x60;
ipv6udp.ipv6.tcf = 0x00;
ipv6udp.ipv6.flow = 0x00;
ipv6udp.ipv6.proto = IP_PROTO_UDP;
ipv6udp.ipv6.ttl = conn->ttl;
/* The IPv6 header length field does not include the size of IPv6 IP
* header.
*/
iplen = buflen + UDP_HDRLEN;
ipv6udp.ipv6.len[0] = (iplen >> 8);
ipv6udp.ipv6.len[1] = (iplen & 0xff);
/* Copy the source and destination addresses */
net_ipv6addr_hdrcopy(ipv6udp.ipv6.destipaddr,
to6->sin6_addr.in6_u.u6_addr16);
if (!net_ipv6addr_cmp(conn->u.ipv6.laddr, g_ipv6_unspecaddr))
{
net_ipv6addr_hdrcopy(ipv6udp.ipv6.srcipaddr, conn->u.ipv6.laddr);
}
else
{
net_ipv6addr_hdrcopy(ipv6udp.ipv6.srcipaddr, dev->d_ipv6addr);
}
ninfo("IPv6 length: %d\n",
((int)ipv6udp.ipv6.len[0] << 8) + ipv6udp.ipv6.len[1]);
#ifdef CONFIG_NET_STATISTICS
g_netstats.ipv6.sent++;
#endif
/* Initialize the UDP header */
ipv6udp.udp.srcport = conn->lport;
ipv6udp.udp.destport = to6->sin6_port;
ipv6udp.udp.udplen = htons(iplen);
ipv6udp.udp.udpchksum = 0;
#ifdef CONFIG_NET_UDP_CHECKSUMS
ipv6udp.udp.udpchksum = ~sixlowpan_udp_chksum(&ipv6udp, buf, buflen);
if (ipv6udp.udp.udpchksum == 0)
{
ipv6udp.udp.udpchksum = 0xffff;
}
#endif /* CONFIG_NET_UDP_CHECKSUMS */
ninfo("Outgoing UDP packet length: %d\n", iplen + IPv6_HDRLEN);
#ifdef CONFIG_NET_STATISTICS
g_netstats.udp.sent++;
#endif
/* Get the IEEE 802.15.4 MAC address of the next hop. */
ret = sixlowpan_nexthopaddr((FAR struct radio_driver_s *)dev,
to6->sin6_addr.in6_u.u6_addr16, &destmac);
if (ret < 0)
{
nerr("ERROR: Failed to get dest MAC address: %d\n", ret);
return (ssize_t)ret;
}
/* If routable, then call sixlowpan_send() to format and send the 6LoWPAN
* packet.
*/
ret = sixlowpan_send(dev, &conn->list,
(FAR const struct ipv6_hdr_s *)&ipv6udp,
buf, buflen, &destmac,
_SO_TIMEOUT(psock->s_sndtimeo));
if (ret < 0)
{
nerr("ERROR: sixlowpan_send() failed: %d\n", ret);
}
return (ssize_t)ret;
}
/****************************************************************************
* Name: psock_6lowpan_udp_send
*
* Description:
* psock_6lowpan_udp_send() call may be used with connectionlesss UDP
* sockets.
*
* Input Parameters:
* psock - An instance of the internal socket structure.
* buf - Data to send
* buflen - Length of data to send
*
* Returned Value:
* On success, returns the number of characters sent. On error,
* -1 is returned, and errno is set appropriately. Returned error numbers
* must be consistent with definition of errors reported by send().
*
* Assumptions:
* Called with the network locked.
*
****************************************************************************/
ssize_t psock_6lowpan_udp_send(FAR struct socket *psock, FAR const void *buf,
size_t buflen)
{
FAR struct udp_conn_s *conn;
struct sockaddr_in6 to;
ninfo("buflen %lu\n", (unsigned long)buflen);
DEBUGASSERT(psock != NULL && psock->s_crefs > 0);
DEBUGASSERT(psock->s_type == SOCK_DGRAM);
sixlowpan_dumpbuffer("Outgoing UDP payload", buf, buflen);
/* Make sure that this is a valid socket */
if (psock != NULL || psock->s_crefs <= 0)
{
nerr("ERROR: Invalid socket\n");
return (ssize_t)-EBADF;
}
/* Was the UDP socket connected via connect()? */
if (psock->s_type != SOCK_DGRAM || !_SS_ISCONNECTED(psock->s_flags))
{
/* No, then it is not legal to call send() with this socket. */
return -ENOTCONN;
}
/* Get the underlying UDP "connection" structure */
conn = (FAR struct udp_conn_s *)psock->s_conn;
DEBUGASSERT(conn != NULL);
/* Ignore if not IPv6 domain */
if (conn->domain != PF_INET6)
{
nwarn("WARNING: Not IPv6\n");
return (ssize_t)-EPROTOTYPE;
}
/* Create the 'to' address */
to.sin6_family = AF_INET6;
to.sin6_port = conn->rport; /* Already network order */
memcpy(to.sin6_addr.in6_u.u6_addr16, conn->u.ipv6.raddr, 16);
return psock_6lowpan_udp_sendto(psock, buf, buflen, 0,
(FAR const struct sockaddr *)&to,
sizeof(struct sockaddr_in6));
}
/****************************************************************************
* Name: sixlowpan_udp_send
*
* Description:
* Handles forwarding a UDP packet via 6LoWPAN. This is currently only
* used by the IPv6 forwarding logic.
*
* Input Parameters:
* dev - An instance of network device state structure
* fwddev - The network device used to send the data. This will be the
* same device except for the IP forwarding case where packets
* are sent across devices.
* ipv6 - A pointer to the IPv6 header in dev->d_buf which lies AFTER
* the L1 header. NOTE: dev->d_len must have been decremented
* by the size of any preceding MAC header.
*
* Returned Value:
* None
*
* Assumptions:
* Called with the network locked.
*
****************************************************************************/
#ifdef CONFIG_NET_IPFORWARD
void sixlowpan_udp_send(FAR struct net_driver_s *dev,
FAR struct net_driver_s *fwddev,
FAR struct ipv6_hdr_s *ipv6)
{
FAR struct ipv6udp_hdr_s *ipv6udp = (FAR struct ipv6udp_hdr_s *)ipv6;
/* Double check */
DEBUGASSERT(dev != NULL && dev->d_len > 0 && fwddev != NULL);
ninfo("d_len %u\n", dev->d_len);
if (dev != NULL && dev->d_len > 0 && fwddev != NULL)
{
sixlowpan_dumpbuffer("Outgoing UDP packet",
(FAR const uint8_t *)ipv6udp, dev->d_len);
/* The UDP data payload should follow the IPv6 header plus the
* protocol header.
*/
if (ipv6udp->ipv6.proto != IP_PROTO_UDP)
{
nwarn("WARNING: Expected UDP prototype: %u vs %s\n",
ipv6udp->ipv6.proto, IP_PROTO_UDP);
}
else
{
struct netdev_varaddr_s destmac;
FAR uint8_t *buf;
uint16_t hdrlen;
uint16_t buflen;
int ret;
/* Get the IEEE 802.15.4 MAC address of the next hop. */
ret = sixlowpan_nexthopaddr((FAR struct radio_driver_s *)fwddev,
ipv6udp->ipv6.destipaddr, &destmac);
if (ret < 0)
{
nerr("ERROR: Failed to get dest MAC address: %d\n", ret);
goto drop;
}
/* Get the IPv6 + UDP combined header length. */
hdrlen = IPv6_HDRLEN + UDP_HDRLEN;
/* Drop the packet if the buffer length is less than this. */
if (hdrlen > dev->d_len)
{
nwarn("WARNING: Dropping small UDP packet: %u < %u\n",
buflen, hdrlen);
}
else
{
/* Convert the outgoing packet into a frame list. */
buf = (FAR uint8_t *)ipv6 + hdrlen;
buflen = dev->d_len - hdrlen;
sixlowpan_queue_frames(
(FAR struct radio_driver_s *)fwddev,
&ipv6udp->ipv6, buf, buflen, &destmac);
}
}
}
drop:
dev->d_len = 0;
}
#endif
#endif /* CONFIG_NET_6LOWPAN && CONFIG_NET_UDP */
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