Add some partial IP forwarding logic.
This commit is contained in:
Gregory Nutt
parent
5060a7cdf2
commit
81cd76484f
@ -52,6 +52,35 @@
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#if defined(CONFIG_NET_IPFORWARD) && defined(CONFIG_NET_IPv6)
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/****************************************************************************
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* Private Types
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****************************************************************************/
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#if defined(CONFIG_NET_UDP) || defined(CONFIG_NET_ICMPv6)
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/* IPv6 + UDP or ICMPv6 header */
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struct ipv6l3_hdr_s
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{
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struct ipv6_hdr_s ipv6;
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union
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{
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#ifdef CONFIG_NET_UDP
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struct udp_hdr_s udp;
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#ifdef CONFIG_NET_ICMPv6
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struct icmpv6_iphdr_s icmp;
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} u;
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};
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#endif
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/* This is the send state structure */
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struct forward_s
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{
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FAR net_driver_s *dev; /* Forwarding device */
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struct ipv6l3_hdr_s hdr; /* Copy of origin L2+L3 headers */
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FAR struct iob_queue_s iobq; /* IOBs contained the data payload */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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@ -118,6 +147,149 @@ static int ipv6_packet_conversion(FAR struct net_driver_s *dev,
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# define ipv6_packet_conversion(dev, ipv6)
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#endif /* CONFIG_NET_6LOWPAN */
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/****************************************************************************
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* Name: ipv6_hdrsize
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*
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* Description:
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* Return the size of the IPv6 header and the following.
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*
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* Input Parameters:
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* ipv6 - A pointer to the IPv6 header in within the IPv6 packet. This
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* is immeidately followed by the L3 header which may be TCP, UDP,
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* or ICMPv6.
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*
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* Returned Value:
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* The size of the combined L2 + L3 headers is returned on success. An
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* error is returned only if the prototype is not supported.
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*
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****************************************************************************/
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static int ipv6_hdrsize(FAR struct ipv6_hdr_s *ipv6)
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{
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/* Copy the following protocol header, */
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switch (ipv6->proto)
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{
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#ifdef CONFIG_NET_TCP
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case IP_PROTO_TCP:
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{
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FAR struct tcp_hdr_s *tcp =
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(FAR struct tcp_hdr_s *)((FAR uintptr_t *)ipv6 + IPv6_HDRLEN);
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unsigned int tcpsize;
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/* The TCP header length is encoded in the top 4 bits of the
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* tcpoffset field (in units of 32-bit words).
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*/
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tcpsize = ((uint16_t)tcp->tcpoffset >> 4) << 2;
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return IPv6_HDRLEN + tcpsize;
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}
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break;
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#endif
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#ifdef CONFIG_NET_UDP
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case IP_PROTO_UDP:
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return IPv6_HDRLEN + UDP_HDRLEN;
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break;
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#endif
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#ifdef CONFIG_NET_ICMPv6
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case IP_PROTO_ICMP6:
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return IPv6_HDRLEN + ICMPv6_HDRLEN;
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break;
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#endif
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default:
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nwarn("WARNING: Unrecognized proto: %u\n", ipv6->proto);
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return -EPROTONOSUPPORT;
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}
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}
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/****************************************************************************
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* Name: ipv6_dev_forward
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*
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* Description:
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* Set up to forward the UDP or ICMPv6 packet on the specified device.
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* This function will set up a send "interrupt" handler that will perform
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* the actual send asynchronously.
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*
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* Input Parameters:
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* dev - The device on which the packet was received and which contains
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* the IPv6 packet.
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* ipv6 - A convenience pointer to the IPv6 header in within the IPv6
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* packet. This is immeidately followed by the L3 header which may
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* be UDP or ICMPv6.
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* iob - A list of IOBs containing the data payload to be sent.
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*
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*
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* On input:
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* - dev->d_buf holds the received packet.
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* - dev->d_len holds the length of the received packet MINUS the
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* size of the L1 header. That was subtracted out by ipv6_input.
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* - ipv6 points to the IPv6 header with dev->d_buf.
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*
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* Returned Value:
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* Zero is returned if the packet was successfully forward; A negated
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* errno value is returned if the packet is not forwardable. In that
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* latter case, the caller (ipv6_input()) should drop the packet.
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*
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****************************************************************************/
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#if defined(CONFIG_NETDEV_MULTINIC)
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static int ipv6_dev_forward(FAR struct net_driver_s *dev,
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FAR struct ipv6_hdr_s *ipv6,
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FAR struct iob_s *iob)
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{
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/* Notify the forwarding device that TX data is available */
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/* Set up to send the packet when the selected device polls for TX data.
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* If the packet is TCP, it must obey ACK and windowing rules.
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*/
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#warning Missing logic
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/* REVISIT: For Ethernet we may have to fix up the Ethernet header:
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* - source MAC, the MAC of the current device.
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* - dest MAC, the MAC associated with the destination IPv6 adress.
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* This will involve ICMPv6 and Neighbor Discovery.
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* - Because of TCP window, the packet may have to be sent in smaller
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* pieces.
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*/
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# warning Missing logic
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nwarn("WARNING: UPD/ICMPv6 packet forwarding not yet supported\n");
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return -ENOSYS;
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}
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#endif
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/****************************************************************************
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* Name: ipv6_dropstats
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*
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* Description:
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* Update statistics for a droped packet.
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*
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* Input Parameters:
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* ipv6 - A convenience pointer to the IPv6 header in within the IPv6
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* packet to be dropped.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#ifdef CONFIG_NET_STATISTICS
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static void ipv6_dropstats(FAR struct ipv6_hdr_s *ipv)
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{
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g_netstats.icmpv6.drop++
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g_netstats.udp.drop++;
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g_netstats.tcp.drop++;
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g_netstats.ipv6.drop++
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}
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#else
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# define ipv6_dropstats(ipv6)
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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@ -187,35 +359,83 @@ int ipv6_forward(FAR struct net_driver_s *dev, FAR struct ipv6_hdr_s *ipv6)
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ret = ipv6_packet_conversion(dev, fwddev, ipv6);
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if (ret < 0)
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{
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/* Extract the IPv6 + L3 header; Move the data payload to an IOB
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* chain.
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FAR struct iob_s *iob = NULL;
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FAR uint8_t *payload;
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unsigned int paysize;
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int hdrsize;
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/* Get the size of the IPv6 + L3 header. Use this to determine
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* start of the data payload.
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*
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* Remember that the size of the L1 header has already been
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* subtracted from dev->d_len.
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*/
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/* Notify the forwarding device that TX data is available */
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hdrsize = ipv6_hdrsize(ipv6);
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if (hdrsize < 0)
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{
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goto drop;
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}
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/* Set up to send the packet when the selected device polls for TX
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* data.
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*/
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payload = (FAR uint8_t *)ipv6 + hdrsize;
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paysize = dev->d_len - hdrsize;
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/* REVISIT: For Ethernet we may have to fix up the Ethernet header:
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* - source MAC, the MAC of the current device.
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* - dest MAC, the MAC associated with the destination IPv6 adress.
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* This will involve ICMPv6 and Neighbor Discovery.
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*/
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if (paysize > 0)
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{
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/* Try to allocate the head of an IOB chain. If this fails,
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* the the packet will be dropped; we are not operating in a
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* context where waiting for an IOB is a good idea
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*/
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/* Return success with dev->d_len = 0 */
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iob = iob_tryalloc(false);
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if (iob == NULL)
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{
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ret = -ENOMEM;
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goto errout_with_iob;
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}
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# warning Missing logic
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nwarn("WARNING: Packet forwarding not yet supported "
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"across different devices\n");
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/* Copy the packet data payload into an IOB chain.
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* iob_trycopin() will not wait, but will fail there are no
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* available IOBs.
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*/
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ret = iob_trycopyin(iob, payload, paysize, 0);
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if (ret < 0)
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{
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goto errout_with_iob;
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}
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}
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/* Then set up to forward the packet */
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if (ipv6->proto == IP_PROTO_TCP)
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{
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ret = tcp_ipv6_forward(dev, ipv6, iob);
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}
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else
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{
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ret = ipv6_dev_forward(dev, ipv6, iob);
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}
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if (ret >= 0)
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{
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dev->d_len = 0;
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return OK;
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}
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errout_with_iob:
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iob_free_chain(iob);
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drop:
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ipv6_dropstats(ipv6);
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dev->d_len = 0;
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return -ENOSYS;
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}
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}
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else
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#endif /* CONFIG_NETDEV_MULTINIC */
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#if defined(CONFIG_NET_6LOWPAN) /* REVISIT: Currently only suport for
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* 6LoWPAN */
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#if defined(CONFIG_NET_6LOWPAN) /* REVISIT: Currently only suport for 6LoWPAN */
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{
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/* Single network device */
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