void udp_ipv6_select(FAR struct net_driver_s *dev)
{
/* Set a bit in the d_flags to distinguish this from an IPv6 packet */
IFF_SET_IPv6(dev->d_flags);
/* Set the offset to the beginning of the UDP data payload */
dev->d_appdata = &dev->d_buf[IPv6UDP_HDRLEN + NET_LL_HDRLEN(dev)];
}
static void icmpv6_echo_request(FAR struct net_driver_s *dev,
FAR struct icmpv6_ping_s *pstate)
{
FAR struct icmpv6_iphdr_s *icmp;
FAR struct icmpv6_echo_request_s *req;
uint16_t reqlen;
int i;
nllvdbg("Send ECHO request: seqno=%d\n", pstate->png_seqno);
/* Set up the IPv6 header (most is probably already in place) */
icmp = ICMPv6BUF;
icmp->vtc = 0x60; /* Version/traffic class (MS) */
icmp->tcf = 0; /* Traffic class (LS)/Flow label (MS) */
icmp->flow = 0; /* Flow label (LS) */
/* Length excludes the IPv6 header */
reqlen = SIZEOF_ICMPV6_ECHO_REQUEST_S(pstate->png_datlen);
icmp->len[0] = (reqlen >> 8);
icmp->len[1] = (reqlen & 0xff);
icmp->proto = IP_PROTO_ICMP6; /* Next header */
icmp->ttl = IP_TTL; /* Hop limit */
/* Set the multicast destination IP address */
net_ipv6addr_copy(icmp->destipaddr, pstate->png_addr);
/* Add out IPv6 address as the source address */
net_ipv6addr_copy(icmp->srcipaddr, dev->d_ipv6addr);
/* Set up the ICMPv6 Echo Request message */
req = ICMPv6ECHOREQ;
req->type = ICMPv6_ECHO_REQUEST; /* Message type */
req->code = 0; /* Message qualifier */
req->id = htons(pstate->png_id);
req->seqno = htons(pstate->png_seqno);
/* Add some easily verifiable data */
for (i = 0; i < pstate->png_datlen; i++)
{
req->data[i] = i;
}
/* Calculate the checksum over both the ICMP header and payload */
icmp->chksum = 0;
icmp->chksum = ~icmpv6_chksum(dev);
/* Set the size to the size of the IPv6 header and the payload size */
IFF_SET_IPv6(dev->d_flags);
dev->d_sndlen = reqlen;
dev->d_len = reqlen + IPv6_HDRLEN;
nllvdbg("Outgoing ICMPv6 Echo Request length: %d (%d)\n",
dev->d_len, (icmp->len[0] << 8) | icmp->len[1]);
#ifdef CONFIG_NET_STATISTICS
g_netstats.icmpv6.sent++;
g_netstats.ipv6.sent++;
#endif
}
