6lowpan: Moving generic compression code into 6lowpan_iphc.c
Because the IEEE 802154 and Bluetooth share the IP header compression and uncompression code, the common code is moved to 6lowpan_iphc.c file. Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com> Acked-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
parent
71fb419724
commit
8df8c56a5a
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@ -62,9 +62,6 @@
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#include "6lowpan.h"
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#include "6lowpan.h"
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/* TTL uncompression values */
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static const u8 lowpan_ttl_values[] = {0, 1, 64, 255};
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static LIST_HEAD(lowpan_devices);
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static LIST_HEAD(lowpan_devices);
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/* private device info */
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/* private device info */
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@ -135,347 +132,14 @@ static inline void lowpan_raw_dump_table(const char *caller, char *msg,
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#endif /* DEBUG */
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#endif /* DEBUG */
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}
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}
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static u8
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lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr,
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const unsigned char *lladdr)
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{
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u8 val = 0;
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if (is_addr_mac_addr_based(ipaddr, lladdr))
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val = 3; /* 0-bits */
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else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
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/* compress IID to 16 bits xxxx::XXXX */
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memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2);
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*hc06_ptr += 2;
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val = 2; /* 16-bits */
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} else {
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/* do not compress IID => xxxx::IID */
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memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8);
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*hc06_ptr += 8;
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val = 1; /* 64-bits */
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}
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return rol8(val, shift);
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}
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/*
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* Uncompress address function for source and
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* destination address(non-multicast).
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*
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* address_mode is sam value or dam value.
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*/
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static int
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lowpan_uncompress_addr(struct sk_buff *skb,
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struct in6_addr *ipaddr,
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const u8 address_mode,
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const struct ieee802154_addr *lladdr)
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{
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bool fail;
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switch (address_mode) {
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case LOWPAN_IPHC_ADDR_00:
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/* for global link addresses */
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fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16);
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break;
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case LOWPAN_IPHC_ADDR_01:
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/* fe:80::XXXX:XXXX:XXXX:XXXX */
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ipaddr->s6_addr[0] = 0xFE;
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ipaddr->s6_addr[1] = 0x80;
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fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[8], 8);
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break;
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case LOWPAN_IPHC_ADDR_02:
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/* fe:80::ff:fe00:XXXX */
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ipaddr->s6_addr[0] = 0xFE;
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ipaddr->s6_addr[1] = 0x80;
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ipaddr->s6_addr[11] = 0xFF;
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ipaddr->s6_addr[12] = 0xFE;
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fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[14], 2);
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break;
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case LOWPAN_IPHC_ADDR_03:
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fail = false;
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switch (lladdr->addr_type) {
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case IEEE802154_ADDR_LONG:
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/* fe:80::XXXX:XXXX:XXXX:XXXX
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* \_________________/
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* hwaddr
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*/
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ipaddr->s6_addr[0] = 0xFE;
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ipaddr->s6_addr[1] = 0x80;
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memcpy(&ipaddr->s6_addr[8], lladdr->hwaddr,
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IEEE802154_ADDR_LEN);
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/* second bit-flip (Universe/Local)
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* is done according RFC2464
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*/
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ipaddr->s6_addr[8] ^= 0x02;
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break;
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case IEEE802154_ADDR_SHORT:
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/* fe:80::ff:fe00:XXXX
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* \__/
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* short_addr
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*
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* Universe/Local bit is zero.
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*/
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ipaddr->s6_addr[0] = 0xFE;
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ipaddr->s6_addr[1] = 0x80;
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ipaddr->s6_addr[11] = 0xFF;
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ipaddr->s6_addr[12] = 0xFE;
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ipaddr->s6_addr16[7] = htons(lladdr->short_addr);
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break;
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default:
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pr_debug("Invalid addr_type set\n");
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return -EINVAL;
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}
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break;
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default:
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pr_debug("Invalid address mode value: 0x%x\n", address_mode);
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return -EINVAL;
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}
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if (fail) {
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pr_debug("Failed to fetch skb data\n");
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return -EIO;
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}
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lowpan_raw_dump_inline(NULL, "Reconstructed ipv6 addr is:\n",
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ipaddr->s6_addr, 16);
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return 0;
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}
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/* Uncompress address function for source context
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* based address(non-multicast).
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*/
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static int
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lowpan_uncompress_context_based_src_addr(struct sk_buff *skb,
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struct in6_addr *ipaddr,
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const u8 sam)
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{
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switch (sam) {
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case LOWPAN_IPHC_ADDR_00:
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/* unspec address ::
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* Do nothing, address is already ::
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*/
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break;
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case LOWPAN_IPHC_ADDR_01:
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/* TODO */
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case LOWPAN_IPHC_ADDR_02:
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/* TODO */
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case LOWPAN_IPHC_ADDR_03:
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/* TODO */
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netdev_warn(skb->dev, "SAM value 0x%x not supported\n", sam);
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return -EINVAL;
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default:
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pr_debug("Invalid sam value: 0x%x\n", sam);
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return -EINVAL;
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}
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lowpan_raw_dump_inline(NULL,
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"Reconstructed context based ipv6 src addr is:\n",
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ipaddr->s6_addr, 16);
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return 0;
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}
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/* Uncompress function for multicast destination address,
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* when M bit is set.
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*/
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static int
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lowpan_uncompress_multicast_daddr(struct sk_buff *skb,
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struct in6_addr *ipaddr,
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const u8 dam)
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{
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bool fail;
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switch (dam) {
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case LOWPAN_IPHC_DAM_00:
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/* 00: 128 bits. The full address
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* is carried in-line.
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*/
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fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16);
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break;
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case LOWPAN_IPHC_DAM_01:
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/* 01: 48 bits. The address takes
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* the form ffXX::00XX:XXXX:XXXX.
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*/
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ipaddr->s6_addr[0] = 0xFF;
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fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1);
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fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[11], 5);
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break;
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case LOWPAN_IPHC_DAM_10:
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/* 10: 32 bits. The address takes
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* the form ffXX::00XX:XXXX.
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*/
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ipaddr->s6_addr[0] = 0xFF;
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fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1);
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fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[13], 3);
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break;
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case LOWPAN_IPHC_DAM_11:
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/* 11: 8 bits. The address takes
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* the form ff02::00XX.
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*/
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ipaddr->s6_addr[0] = 0xFF;
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ipaddr->s6_addr[1] = 0x02;
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fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[15], 1);
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break;
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default:
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pr_debug("DAM value has a wrong value: 0x%x\n", dam);
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return -EINVAL;
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}
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if (fail) {
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pr_debug("Failed to fetch skb data\n");
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return -EIO;
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}
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lowpan_raw_dump_inline(NULL, "Reconstructed ipv6 multicast addr is:\n",
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ipaddr->s6_addr, 16);
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return 0;
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}
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static void
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lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
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{
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struct udphdr *uh = udp_hdr(skb);
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if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) ==
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LOWPAN_NHC_UDP_4BIT_PORT) &&
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((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) ==
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LOWPAN_NHC_UDP_4BIT_PORT)) {
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pr_debug("UDP header: both ports compression to 4 bits\n");
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**hc06_ptr = LOWPAN_NHC_UDP_CS_P_11;
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**(hc06_ptr + 1) = /* subtraction is faster */
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(u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) +
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((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4));
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*hc06_ptr += 2;
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} else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) ==
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LOWPAN_NHC_UDP_8BIT_PORT) {
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pr_debug("UDP header: remove 8 bits of dest\n");
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**hc06_ptr = LOWPAN_NHC_UDP_CS_P_01;
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memcpy(*hc06_ptr + 1, &uh->source, 2);
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**(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT);
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*hc06_ptr += 4;
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} else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) ==
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LOWPAN_NHC_UDP_8BIT_PORT) {
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pr_debug("UDP header: remove 8 bits of source\n");
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**hc06_ptr = LOWPAN_NHC_UDP_CS_P_10;
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memcpy(*hc06_ptr + 1, &uh->dest, 2);
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**(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT);
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*hc06_ptr += 4;
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} else {
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pr_debug("UDP header: can't compress\n");
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**hc06_ptr = LOWPAN_NHC_UDP_CS_P_00;
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memcpy(*hc06_ptr + 1, &uh->source, 2);
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memcpy(*hc06_ptr + 3, &uh->dest, 2);
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*hc06_ptr += 5;
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}
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/* checksum is always inline */
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memcpy(*hc06_ptr, &uh->check, 2);
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*hc06_ptr += 2;
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/* skip the UDP header */
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skb_pull(skb, sizeof(struct udphdr));
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}
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static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val)
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{
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if (unlikely(!pskb_may_pull(skb, 1)))
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return -EINVAL;
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*val = skb->data[0];
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skb_pull(skb, 1);
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return 0;
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}
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static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val)
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{
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if (unlikely(!pskb_may_pull(skb, 2)))
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return -EINVAL;
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*val = (skb->data[0] << 8) | skb->data[1];
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skb_pull(skb, 2);
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return 0;
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}
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static int
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lowpan_uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh)
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{
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u8 tmp;
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if (!uh)
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goto err;
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if (lowpan_fetch_skb_u8(skb, &tmp))
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goto err;
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if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
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pr_debug("UDP header uncompression\n");
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switch (tmp & LOWPAN_NHC_UDP_CS_P_11) {
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case LOWPAN_NHC_UDP_CS_P_00:
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memcpy(&uh->source, &skb->data[0], 2);
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memcpy(&uh->dest, &skb->data[2], 2);
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skb_pull(skb, 4);
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break;
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case LOWPAN_NHC_UDP_CS_P_01:
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memcpy(&uh->source, &skb->data[0], 2);
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uh->dest =
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skb->data[2] + LOWPAN_NHC_UDP_8BIT_PORT;
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skb_pull(skb, 3);
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break;
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case LOWPAN_NHC_UDP_CS_P_10:
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uh->source = skb->data[0] + LOWPAN_NHC_UDP_8BIT_PORT;
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memcpy(&uh->dest, &skb->data[1], 2);
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skb_pull(skb, 3);
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break;
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case LOWPAN_NHC_UDP_CS_P_11:
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uh->source =
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LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] >> 4);
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uh->dest =
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LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] & 0x0f);
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skb_pull(skb, 1);
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break;
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default:
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pr_debug("ERROR: unknown UDP format\n");
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goto err;
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}
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pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
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uh->source, uh->dest);
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/* copy checksum */
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memcpy(&uh->check, &skb->data[0], 2);
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skb_pull(skb, 2);
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/*
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* UDP lenght needs to be infered from the lower layers
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* here, we obtain the hint from the remaining size of the
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* frame
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*/
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uh->len = htons(skb->len + sizeof(struct udphdr));
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pr_debug("uncompressed UDP length: src = %d", uh->len);
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} else {
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pr_debug("ERROR: unsupported NH format\n");
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goto err;
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}
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return 0;
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err:
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return -EINVAL;
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}
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static int lowpan_header_create(struct sk_buff *skb,
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static int lowpan_header_create(struct sk_buff *skb,
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struct net_device *dev,
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struct net_device *dev,
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unsigned short type, const void *_daddr,
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unsigned short type, const void *_daddr,
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const void *_saddr, unsigned int len)
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const void *_saddr, unsigned int len)
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{
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{
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u8 tmp, iphc0, iphc1, *hc06_ptr;
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struct ipv6hdr *hdr;
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struct ipv6hdr *hdr;
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const u8 *saddr = _saddr;
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const u8 *saddr = _saddr;
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const u8 *daddr = _daddr;
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const u8 *daddr = _daddr;
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u8 head[100];
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struct ieee802154_addr sa, da;
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struct ieee802154_addr sa, da;
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/* TODO:
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/* TODO:
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@ -485,181 +149,14 @@ static int lowpan_header_create(struct sk_buff *skb,
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return 0;
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return 0;
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hdr = ipv6_hdr(skb);
|
hdr = ipv6_hdr(skb);
|
||||||
hc06_ptr = head + 2;
|
|
||||||
|
|
||||||
pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
|
|
||||||
"\tnexthdr = 0x%02x\n\thop_lim = %d\n", hdr->version,
|
|
||||||
ntohs(hdr->payload_len), hdr->nexthdr, hdr->hop_limit);
|
|
||||||
|
|
||||||
lowpan_raw_dump_table(__func__, "raw skb network header dump",
|
|
||||||
skb_network_header(skb), sizeof(struct ipv6hdr));
|
|
||||||
|
|
||||||
if (!saddr)
|
if (!saddr)
|
||||||
saddr = dev->dev_addr;
|
saddr = dev->dev_addr;
|
||||||
|
|
||||||
lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
|
lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
|
||||||
|
|
||||||
/*
|
|
||||||
* As we copy some bit-length fields, in the IPHC encoding bytes,
|
|
||||||
* we sometimes use |=
|
|
||||||
* If the field is 0, and the current bit value in memory is 1,
|
|
||||||
* this does not work. We therefore reset the IPHC encoding here
|
|
||||||
*/
|
|
||||||
iphc0 = LOWPAN_DISPATCH_IPHC;
|
|
||||||
iphc1 = 0;
|
|
||||||
|
|
||||||
/* TODO: context lookup */
|
|
||||||
|
|
||||||
lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
|
lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
|
||||||
|
|
||||||
/*
|
lowpan_header_compress(skb, dev, type, daddr, saddr, len);
|
||||||
* Traffic class, flow label
|
|
||||||
* If flow label is 0, compress it. If traffic class is 0, compress it
|
|
||||||
* We have to process both in the same time as the offset of traffic
|
|
||||||
* class depends on the presence of version and flow label
|
|
||||||
*/
|
|
||||||
|
|
||||||
/* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
|
|
||||||
tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
|
|
||||||
tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
|
|
||||||
|
|
||||||
if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
|
|
||||||
(hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
|
|
||||||
/* flow label can be compressed */
|
|
||||||
iphc0 |= LOWPAN_IPHC_FL_C;
|
|
||||||
if ((hdr->priority == 0) &&
|
|
||||||
((hdr->flow_lbl[0] & 0xF0) == 0)) {
|
|
||||||
/* compress (elide) all */
|
|
||||||
iphc0 |= LOWPAN_IPHC_TC_C;
|
|
||||||
} else {
|
|
||||||
/* compress only the flow label */
|
|
||||||
*hc06_ptr = tmp;
|
|
||||||
hc06_ptr += 1;
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
/* Flow label cannot be compressed */
|
|
||||||
if ((hdr->priority == 0) &&
|
|
||||||
((hdr->flow_lbl[0] & 0xF0) == 0)) {
|
|
||||||
/* compress only traffic class */
|
|
||||||
iphc0 |= LOWPAN_IPHC_TC_C;
|
|
||||||
*hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
|
|
||||||
memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
|
|
||||||
hc06_ptr += 3;
|
|
||||||
} else {
|
|
||||||
/* compress nothing */
|
|
||||||
memcpy(hc06_ptr, &hdr, 4);
|
|
||||||
/* replace the top byte with new ECN | DSCP format */
|
|
||||||
*hc06_ptr = tmp;
|
|
||||||
hc06_ptr += 4;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
/* NOTE: payload length is always compressed */
|
|
||||||
|
|
||||||
/* Next Header is compress if UDP */
|
|
||||||
if (hdr->nexthdr == UIP_PROTO_UDP)
|
|
||||||
iphc0 |= LOWPAN_IPHC_NH_C;
|
|
||||||
|
|
||||||
if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
|
|
||||||
*hc06_ptr = hdr->nexthdr;
|
|
||||||
hc06_ptr += 1;
|
|
||||||
}
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Hop limit
|
|
||||||
* if 1: compress, encoding is 01
|
|
||||||
* if 64: compress, encoding is 10
|
|
||||||
* if 255: compress, encoding is 11
|
|
||||||
* else do not compress
|
|
||||||
*/
|
|
||||||
switch (hdr->hop_limit) {
|
|
||||||
case 1:
|
|
||||||
iphc0 |= LOWPAN_IPHC_TTL_1;
|
|
||||||
break;
|
|
||||||
case 64:
|
|
||||||
iphc0 |= LOWPAN_IPHC_TTL_64;
|
|
||||||
break;
|
|
||||||
case 255:
|
|
||||||
iphc0 |= LOWPAN_IPHC_TTL_255;
|
|
||||||
break;
|
|
||||||
default:
|
|
||||||
*hc06_ptr = hdr->hop_limit;
|
|
||||||
hc06_ptr += 1;
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* source address compression */
|
|
||||||
if (is_addr_unspecified(&hdr->saddr)) {
|
|
||||||
pr_debug("source address is unspecified, setting SAC\n");
|
|
||||||
iphc1 |= LOWPAN_IPHC_SAC;
|
|
||||||
/* TODO: context lookup */
|
|
||||||
} else if (is_addr_link_local(&hdr->saddr)) {
|
|
||||||
pr_debug("source address is link-local\n");
|
|
||||||
iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
|
|
||||||
LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr);
|
|
||||||
} else {
|
|
||||||
pr_debug("send the full source address\n");
|
|
||||||
memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
|
|
||||||
hc06_ptr += 16;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* destination address compression */
|
|
||||||
if (is_addr_mcast(&hdr->daddr)) {
|
|
||||||
pr_debug("destination address is multicast: ");
|
|
||||||
iphc1 |= LOWPAN_IPHC_M;
|
|
||||||
if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
|
|
||||||
pr_debug("compressed to 1 octet\n");
|
|
||||||
iphc1 |= LOWPAN_IPHC_DAM_11;
|
|
||||||
/* use last byte */
|
|
||||||
*hc06_ptr = hdr->daddr.s6_addr[15];
|
|
||||||
hc06_ptr += 1;
|
|
||||||
} else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
|
|
||||||
pr_debug("compressed to 4 octets\n");
|
|
||||||
iphc1 |= LOWPAN_IPHC_DAM_10;
|
|
||||||
/* second byte + the last three */
|
|
||||||
*hc06_ptr = hdr->daddr.s6_addr[1];
|
|
||||||
memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
|
|
||||||
hc06_ptr += 4;
|
|
||||||
} else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
|
|
||||||
pr_debug("compressed to 6 octets\n");
|
|
||||||
iphc1 |= LOWPAN_IPHC_DAM_01;
|
|
||||||
/* second byte + the last five */
|
|
||||||
*hc06_ptr = hdr->daddr.s6_addr[1];
|
|
||||||
memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
|
|
||||||
hc06_ptr += 6;
|
|
||||||
} else {
|
|
||||||
pr_debug("using full address\n");
|
|
||||||
iphc1 |= LOWPAN_IPHC_DAM_00;
|
|
||||||
memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
|
|
||||||
hc06_ptr += 16;
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
/* TODO: context lookup */
|
|
||||||
if (is_addr_link_local(&hdr->daddr)) {
|
|
||||||
pr_debug("dest address is unicast and link-local\n");
|
|
||||||
iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
|
|
||||||
LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr);
|
|
||||||
} else {
|
|
||||||
pr_debug("dest address is unicast: using full one\n");
|
|
||||||
memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
|
|
||||||
hc06_ptr += 16;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
/* UDP header compression */
|
|
||||||
if (hdr->nexthdr == UIP_PROTO_UDP)
|
|
||||||
lowpan_compress_udp_header(&hc06_ptr, skb);
|
|
||||||
|
|
||||||
head[0] = iphc0;
|
|
||||||
head[1] = iphc1;
|
|
||||||
|
|
||||||
skb_pull(skb, sizeof(struct ipv6hdr));
|
|
||||||
skb_reset_transport_header(skb);
|
|
||||||
memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
|
|
||||||
skb_reset_network_header(skb);
|
|
||||||
|
|
||||||
lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
|
|
||||||
skb->len);
|
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* NOTE1: I'm still unsure about the fact that compression and WPAN
|
* NOTE1: I'm still unsure about the fact that compression and WPAN
|
||||||
|
@ -671,39 +168,38 @@ static int lowpan_header_create(struct sk_buff *skb,
|
||||||
* from MAC subif of the 'dev' and 'real_dev' network devices, but
|
* from MAC subif of the 'dev' and 'real_dev' network devices, but
|
||||||
* this isn't implemented in mainline yet, so currently we assign 0xff
|
* this isn't implemented in mainline yet, so currently we assign 0xff
|
||||||
*/
|
*/
|
||||||
{
|
mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
|
||||||
mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
|
mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
|
||||||
mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
|
|
||||||
|
|
||||||
/* prepare wpan address data */
|
/* prepare wpan address data */
|
||||||
sa.addr_type = IEEE802154_ADDR_LONG;
|
sa.addr_type = IEEE802154_ADDR_LONG;
|
||||||
sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
|
sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
|
||||||
|
|
||||||
memcpy(&(sa.hwaddr), saddr, 8);
|
memcpy(&(sa.hwaddr), saddr, 8);
|
||||||
/* intra-PAN communications */
|
/* intra-PAN communications */
|
||||||
da.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
|
da.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* if the destination address is the broadcast address, use the
|
* if the destination address is the broadcast address, use the
|
||||||
* corresponding short address
|
* corresponding short address
|
||||||
*/
|
*/
|
||||||
if (lowpan_is_addr_broadcast(daddr)) {
|
if (lowpan_is_addr_broadcast(daddr)) {
|
||||||
da.addr_type = IEEE802154_ADDR_SHORT;
|
da.addr_type = IEEE802154_ADDR_SHORT;
|
||||||
da.short_addr = IEEE802154_ADDR_BROADCAST;
|
da.short_addr = IEEE802154_ADDR_BROADCAST;
|
||||||
} else {
|
} else {
|
||||||
da.addr_type = IEEE802154_ADDR_LONG;
|
da.addr_type = IEEE802154_ADDR_LONG;
|
||||||
memcpy(&(da.hwaddr), daddr, IEEE802154_ADDR_LEN);
|
memcpy(&(da.hwaddr), daddr, IEEE802154_ADDR_LEN);
|
||||||
|
|
||||||
/* request acknowledgment */
|
/* request acknowledgment */
|
||||||
mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
|
mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
|
||||||
}
|
|
||||||
|
|
||||||
return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
|
|
||||||
type, (void *)&da, (void *)&sa, skb->len);
|
|
||||||
}
|
}
|
||||||
|
|
||||||
|
return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
|
||||||
|
type, (void *)&da, (void *)&sa, skb->len);
|
||||||
}
|
}
|
||||||
|
|
||||||
static int lowpan_give_skb_to_devices(struct sk_buff *skb)
|
static int lowpan_give_skb_to_devices(struct sk_buff *skb,
|
||||||
|
struct net_device *dev)
|
||||||
{
|
{
|
||||||
struct lowpan_dev_record *entry;
|
struct lowpan_dev_record *entry;
|
||||||
struct sk_buff *skb_cp;
|
struct sk_buff *skb_cp;
|
||||||
|
@ -726,31 +222,6 @@ static int lowpan_give_skb_to_devices(struct sk_buff *skb)
|
||||||
return stat;
|
return stat;
|
||||||
}
|
}
|
||||||
|
|
||||||
static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
|
|
||||||
{
|
|
||||||
struct sk_buff *new;
|
|
||||||
int stat = NET_RX_SUCCESS;
|
|
||||||
|
|
||||||
new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
|
|
||||||
GFP_ATOMIC);
|
|
||||||
kfree_skb(skb);
|
|
||||||
|
|
||||||
if (!new)
|
|
||||||
return -ENOMEM;
|
|
||||||
|
|
||||||
skb_push(new, sizeof(struct ipv6hdr));
|
|
||||||
skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr));
|
|
||||||
|
|
||||||
new->protocol = htons(ETH_P_IPV6);
|
|
||||||
new->pkt_type = PACKET_HOST;
|
|
||||||
|
|
||||||
stat = lowpan_give_skb_to_devices(new);
|
|
||||||
|
|
||||||
kfree_skb(new);
|
|
||||||
|
|
||||||
return stat;
|
|
||||||
}
|
|
||||||
|
|
||||||
static void lowpan_fragment_timer_expired(unsigned long entry_addr)
|
static void lowpan_fragment_timer_expired(unsigned long entry_addr)
|
||||||
{
|
{
|
||||||
struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
|
struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
|
||||||
|
@ -814,13 +285,10 @@ frame_err:
|
||||||
return NULL;
|
return NULL;
|
||||||
}
|
}
|
||||||
|
|
||||||
static int
|
static int process_data(struct sk_buff *skb)
|
||||||
lowpan_process_data(struct sk_buff *skb)
|
|
||||||
{
|
{
|
||||||
struct ipv6hdr hdr = {};
|
u8 iphc0, iphc1;
|
||||||
u8 tmp, iphc0, iphc1, num_context = 0;
|
|
||||||
const struct ieee802154_addr *_saddr, *_daddr;
|
const struct ieee802154_addr *_saddr, *_daddr;
|
||||||
int err;
|
|
||||||
|
|
||||||
lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
|
lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
|
||||||
skb->len);
|
skb->len);
|
||||||
|
@ -925,162 +393,11 @@ lowpan_process_data(struct sk_buff *skb)
|
||||||
_saddr = &mac_cb(skb)->sa;
|
_saddr = &mac_cb(skb)->sa;
|
||||||
_daddr = &mac_cb(skb)->da;
|
_daddr = &mac_cb(skb)->da;
|
||||||
|
|
||||||
pr_debug("iphc0 = %02x, iphc1 = %02x\n", iphc0, iphc1);
|
return lowpan_process_data(skb, skb->dev, (u8 *)_saddr->hwaddr,
|
||||||
|
_saddr->addr_type, IEEE802154_ADDR_LEN,
|
||||||
/* another if the CID flag is set */
|
(u8 *)_daddr->hwaddr, _daddr->addr_type,
|
||||||
if (iphc1 & LOWPAN_IPHC_CID) {
|
IEEE802154_ADDR_LEN, iphc0, iphc1,
|
||||||
pr_debug("CID flag is set, increase header with one\n");
|
lowpan_give_skb_to_devices);
|
||||||
if (lowpan_fetch_skb_u8(skb, &num_context))
|
|
||||||
goto drop;
|
|
||||||
}
|
|
||||||
|
|
||||||
hdr.version = 6;
|
|
||||||
|
|
||||||
/* Traffic Class and Flow Label */
|
|
||||||
switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
|
|
||||||
/*
|
|
||||||
* Traffic Class and FLow Label carried in-line
|
|
||||||
* ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
|
|
||||||
*/
|
|
||||||
case 0: /* 00b */
|
|
||||||
if (lowpan_fetch_skb_u8(skb, &tmp))
|
|
||||||
goto drop;
|
|
||||||
|
|
||||||
memcpy(&hdr.flow_lbl, &skb->data[0], 3);
|
|
||||||
skb_pull(skb, 3);
|
|
||||||
hdr.priority = ((tmp >> 2) & 0x0f);
|
|
||||||
hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
|
|
||||||
(hdr.flow_lbl[0] & 0x0f);
|
|
||||||
break;
|
|
||||||
/*
|
|
||||||
* Traffic class carried in-line
|
|
||||||
* ECN + DSCP (1 byte), Flow Label is elided
|
|
||||||
*/
|
|
||||||
case 2: /* 10b */
|
|
||||||
if (lowpan_fetch_skb_u8(skb, &tmp))
|
|
||||||
goto drop;
|
|
||||||
|
|
||||||
hdr.priority = ((tmp >> 2) & 0x0f);
|
|
||||||
hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
|
|
||||||
break;
|
|
||||||
/*
|
|
||||||
* Flow Label carried in-line
|
|
||||||
* ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
|
|
||||||
*/
|
|
||||||
case 1: /* 01b */
|
|
||||||
if (lowpan_fetch_skb_u8(skb, &tmp))
|
|
||||||
goto drop;
|
|
||||||
|
|
||||||
hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
|
|
||||||
memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
|
|
||||||
skb_pull(skb, 2);
|
|
||||||
break;
|
|
||||||
/* Traffic Class and Flow Label are elided */
|
|
||||||
case 3: /* 11b */
|
|
||||||
break;
|
|
||||||
default:
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Next Header */
|
|
||||||
if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
|
|
||||||
/* Next header is carried inline */
|
|
||||||
if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr)))
|
|
||||||
goto drop;
|
|
||||||
|
|
||||||
pr_debug("NH flag is set, next header carried inline: %02x\n",
|
|
||||||
hdr.nexthdr);
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Hop Limit */
|
|
||||||
if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
|
|
||||||
hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
|
|
||||||
else {
|
|
||||||
if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit)))
|
|
||||||
goto drop;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Extract SAM to the tmp variable */
|
|
||||||
tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
|
|
||||||
|
|
||||||
if (iphc1 & LOWPAN_IPHC_SAC) {
|
|
||||||
/* Source address context based uncompression */
|
|
||||||
pr_debug("SAC bit is set. Handle context based source address.\n");
|
|
||||||
err = lowpan_uncompress_context_based_src_addr(
|
|
||||||
skb, &hdr.saddr, tmp);
|
|
||||||
} else {
|
|
||||||
/* Source address uncompression */
|
|
||||||
pr_debug("source address stateless compression\n");
|
|
||||||
err = lowpan_uncompress_addr(skb, &hdr.saddr, tmp, _saddr);
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Check on error of previous branch */
|
|
||||||
if (err)
|
|
||||||
goto drop;
|
|
||||||
|
|
||||||
/* Extract DAM to the tmp variable */
|
|
||||||
tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
|
|
||||||
|
|
||||||
/* check for Multicast Compression */
|
|
||||||
if (iphc1 & LOWPAN_IPHC_M) {
|
|
||||||
if (iphc1 & LOWPAN_IPHC_DAC) {
|
|
||||||
pr_debug("dest: context-based mcast compression\n");
|
|
||||||
/* TODO: implement this */
|
|
||||||
} else {
|
|
||||||
err = lowpan_uncompress_multicast_daddr(
|
|
||||||
skb, &hdr.daddr, tmp);
|
|
||||||
if (err)
|
|
||||||
goto drop;
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
pr_debug("dest: stateless compression\n");
|
|
||||||
err = lowpan_uncompress_addr(skb, &hdr.daddr, tmp, _daddr);
|
|
||||||
if (err)
|
|
||||||
goto drop;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* UDP data uncompression */
|
|
||||||
if (iphc0 & LOWPAN_IPHC_NH_C) {
|
|
||||||
struct udphdr uh;
|
|
||||||
struct sk_buff *new;
|
|
||||||
if (lowpan_uncompress_udp_header(skb, &uh))
|
|
||||||
goto drop;
|
|
||||||
|
|
||||||
/*
|
|
||||||
* replace the compressed UDP head by the uncompressed UDP
|
|
||||||
* header
|
|
||||||
*/
|
|
||||||
new = skb_copy_expand(skb, sizeof(struct udphdr),
|
|
||||||
skb_tailroom(skb), GFP_ATOMIC);
|
|
||||||
kfree_skb(skb);
|
|
||||||
|
|
||||||
if (!new)
|
|
||||||
return -ENOMEM;
|
|
||||||
|
|
||||||
skb = new;
|
|
||||||
|
|
||||||
skb_push(skb, sizeof(struct udphdr));
|
|
||||||
skb_copy_to_linear_data(skb, &uh, sizeof(struct udphdr));
|
|
||||||
|
|
||||||
lowpan_raw_dump_table(__func__, "raw UDP header dump",
|
|
||||||
(u8 *)&uh, sizeof(uh));
|
|
||||||
|
|
||||||
hdr.nexthdr = UIP_PROTO_UDP;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Not fragmented package */
|
|
||||||
hdr.payload_len = htons(skb->len);
|
|
||||||
|
|
||||||
pr_debug("skb headroom size = %d, data length = %d\n",
|
|
||||||
skb_headroom(skb), skb->len);
|
|
||||||
|
|
||||||
pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
|
|
||||||
"nexthdr = 0x%02x\n\thop_lim = %d\n", hdr.version,
|
|
||||||
ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit);
|
|
||||||
|
|
||||||
lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
|
|
||||||
sizeof(hdr));
|
|
||||||
return lowpan_skb_deliver(skb, &hdr);
|
|
||||||
|
|
||||||
unlock_and_drop:
|
unlock_and_drop:
|
||||||
spin_unlock_bh(&flist_lock);
|
spin_unlock_bh(&flist_lock);
|
||||||
|
@ -1316,7 +633,7 @@ static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
|
||||||
/* Pull off the 1-byte of 6lowpan header. */
|
/* Pull off the 1-byte of 6lowpan header. */
|
||||||
skb_pull(local_skb, 1);
|
skb_pull(local_skb, 1);
|
||||||
|
|
||||||
lowpan_give_skb_to_devices(local_skb);
|
lowpan_give_skb_to_devices(local_skb, NULL);
|
||||||
|
|
||||||
kfree_skb(local_skb);
|
kfree_skb(local_skb);
|
||||||
kfree_skb(skb);
|
kfree_skb(skb);
|
||||||
|
@ -1328,7 +645,7 @@ static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
|
||||||
local_skb = skb_clone(skb, GFP_ATOMIC);
|
local_skb = skb_clone(skb, GFP_ATOMIC);
|
||||||
if (!local_skb)
|
if (!local_skb)
|
||||||
goto drop;
|
goto drop;
|
||||||
lowpan_process_data(local_skb);
|
process_data(local_skb);
|
||||||
|
|
||||||
kfree_skb(skb);
|
kfree_skb(skb);
|
||||||
break;
|
break;
|
||||||
|
|
|
@ -232,6 +232,28 @@
|
||||||
dest = 16 bit inline */
|
dest = 16 bit inline */
|
||||||
#define LOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */
|
#define LOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */
|
||||||
|
|
||||||
|
static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val)
|
||||||
|
{
|
||||||
|
if (unlikely(!pskb_may_pull(skb, 1)))
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
*val = skb->data[0];
|
||||||
|
skb_pull(skb, 1);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val)
|
||||||
|
{
|
||||||
|
if (unlikely(!pskb_may_pull(skb, 2)))
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
*val = (skb->data[0] << 8) | skb->data[1];
|
||||||
|
skb_pull(skb, 2);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
static inline bool lowpan_fetch_skb(struct sk_buff *skb,
|
static inline bool lowpan_fetch_skb(struct sk_buff *skb,
|
||||||
void *data, const unsigned int len)
|
void *data, const unsigned int len)
|
||||||
{
|
{
|
||||||
|
@ -244,4 +266,14 @@ static inline bool lowpan_fetch_skb(struct sk_buff *skb,
|
||||||
return false;
|
return false;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
typedef int (*skb_delivery_cb)(struct sk_buff *skb, struct net_device *dev);
|
||||||
|
|
||||||
|
int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
|
||||||
|
const u8 *saddr, const u8 saddr_type, const u8 saddr_len,
|
||||||
|
const u8 *daddr, const u8 daddr_type, const u8 daddr_len,
|
||||||
|
u8 iphc0, u8 iphc1, skb_delivery_cb skb_deliver);
|
||||||
|
int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
|
||||||
|
unsigned short type, const void *_daddr,
|
||||||
|
const void *_saddr, unsigned int len);
|
||||||
|
|
||||||
#endif /* __6LOWPAN_H__ */
|
#endif /* __6LOWPAN_H__ */
|
||||||
|
|
|
@ -0,0 +1,807 @@
|
||||||
|
/*
|
||||||
|
* Copyright 2011, Siemens AG
|
||||||
|
* written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
|
||||||
|
*/
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Based on patches from Jon Smirl <jonsmirl@gmail.com>
|
||||||
|
* Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License version 2
|
||||||
|
* as published by the Free Software Foundation.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful,
|
||||||
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
* GNU General Public License for more details.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the GNU General Public License along
|
||||||
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
||||||
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/* Jon's code is based on 6lowpan implementation for Contiki which is:
|
||||||
|
* Copyright (c) 2008, Swedish Institute of Computer Science.
|
||||||
|
* All rights reserved.
|
||||||
|
*
|
||||||
|
* Redistribution and use in source and binary forms, with or without
|
||||||
|
* modification, are permitted provided that the following conditions
|
||||||
|
* are met:
|
||||||
|
* 1. Redistributions of source code must retain the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer.
|
||||||
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||||||
|
* notice, this list of conditions and the following disclaimer in the
|
||||||
|
* documentation and/or other materials provided with the distribution.
|
||||||
|
* 3. Neither the name of the Institute nor the names of its contributors
|
||||||
|
* may be used to endorse or promote products derived from this software
|
||||||
|
* without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
||||||
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||||
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||||
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
||||||
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||||
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||||
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||||
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||||
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||||
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||||
|
* SUCH DAMAGE.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <linux/bitops.h>
|
||||||
|
#include <linux/if_arp.h>
|
||||||
|
#include <linux/netdevice.h>
|
||||||
|
#include <net/ipv6.h>
|
||||||
|
#include <net/af_ieee802154.h>
|
||||||
|
|
||||||
|
#include "6lowpan.h"
|
||||||
|
|
||||||
|
/* print data in line */
|
||||||
|
static inline void raw_dump_inline(const char *caller, char *msg,
|
||||||
|
unsigned char *buf, int len)
|
||||||
|
{
|
||||||
|
if (msg)
|
||||||
|
pr_debug("%s():%s: ", caller, msg);
|
||||||
|
print_hex_dump_debug("", DUMP_PREFIX_NONE,
|
||||||
|
16, 1, buf, len, false);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* print data in a table format:
|
||||||
|
*
|
||||||
|
* addr: xx xx xx xx xx xx
|
||||||
|
* addr: xx xx xx xx xx xx
|
||||||
|
* ...
|
||||||
|
*/
|
||||||
|
static inline void raw_dump_table(const char *caller, char *msg,
|
||||||
|
unsigned char *buf, int len)
|
||||||
|
{
|
||||||
|
if (msg)
|
||||||
|
pr_debug("%s():%s:\n", caller, msg);
|
||||||
|
print_hex_dump_debug("\t", DUMP_PREFIX_OFFSET,
|
||||||
|
16, 1, buf, len, false);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Uncompress address function for source and
|
||||||
|
* destination address(non-multicast).
|
||||||
|
*
|
||||||
|
* address_mode is sam value or dam value.
|
||||||
|
*/
|
||||||
|
static int uncompress_addr(struct sk_buff *skb,
|
||||||
|
struct in6_addr *ipaddr, const u8 address_mode,
|
||||||
|
const u8 *lladdr, const u8 addr_type,
|
||||||
|
const u8 addr_len)
|
||||||
|
{
|
||||||
|
bool fail;
|
||||||
|
|
||||||
|
switch (address_mode) {
|
||||||
|
case LOWPAN_IPHC_ADDR_00:
|
||||||
|
/* for global link addresses */
|
||||||
|
fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16);
|
||||||
|
break;
|
||||||
|
case LOWPAN_IPHC_ADDR_01:
|
||||||
|
/* fe:80::XXXX:XXXX:XXXX:XXXX */
|
||||||
|
ipaddr->s6_addr[0] = 0xFE;
|
||||||
|
ipaddr->s6_addr[1] = 0x80;
|
||||||
|
fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[8], 8);
|
||||||
|
break;
|
||||||
|
case LOWPAN_IPHC_ADDR_02:
|
||||||
|
/* fe:80::ff:fe00:XXXX */
|
||||||
|
ipaddr->s6_addr[0] = 0xFE;
|
||||||
|
ipaddr->s6_addr[1] = 0x80;
|
||||||
|
ipaddr->s6_addr[11] = 0xFF;
|
||||||
|
ipaddr->s6_addr[12] = 0xFE;
|
||||||
|
fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[14], 2);
|
||||||
|
break;
|
||||||
|
case LOWPAN_IPHC_ADDR_03:
|
||||||
|
fail = false;
|
||||||
|
switch (addr_type) {
|
||||||
|
case IEEE802154_ADDR_LONG:
|
||||||
|
/* fe:80::XXXX:XXXX:XXXX:XXXX
|
||||||
|
* \_________________/
|
||||||
|
* hwaddr
|
||||||
|
*/
|
||||||
|
ipaddr->s6_addr[0] = 0xFE;
|
||||||
|
ipaddr->s6_addr[1] = 0x80;
|
||||||
|
memcpy(&ipaddr->s6_addr[8], lladdr, addr_len);
|
||||||
|
/* second bit-flip (Universe/Local)
|
||||||
|
* is done according RFC2464
|
||||||
|
*/
|
||||||
|
ipaddr->s6_addr[8] ^= 0x02;
|
||||||
|
break;
|
||||||
|
case IEEE802154_ADDR_SHORT:
|
||||||
|
/* fe:80::ff:fe00:XXXX
|
||||||
|
* \__/
|
||||||
|
* short_addr
|
||||||
|
*
|
||||||
|
* Universe/Local bit is zero.
|
||||||
|
*/
|
||||||
|
ipaddr->s6_addr[0] = 0xFE;
|
||||||
|
ipaddr->s6_addr[1] = 0x80;
|
||||||
|
ipaddr->s6_addr[11] = 0xFF;
|
||||||
|
ipaddr->s6_addr[12] = 0xFE;
|
||||||
|
ipaddr->s6_addr16[7] = htons(*((u16 *)lladdr));
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
pr_debug("Invalid addr_type set\n");
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
pr_debug("Invalid address mode value: 0x%x\n", address_mode);
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (fail) {
|
||||||
|
pr_debug("Failed to fetch skb data\n");
|
||||||
|
return -EIO;
|
||||||
|
}
|
||||||
|
|
||||||
|
raw_dump_inline(NULL, "Reconstructed ipv6 addr is",
|
||||||
|
ipaddr->s6_addr, 16);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Uncompress address function for source context
|
||||||
|
* based address(non-multicast).
|
||||||
|
*/
|
||||||
|
static int uncompress_context_based_src_addr(struct sk_buff *skb,
|
||||||
|
struct in6_addr *ipaddr,
|
||||||
|
const u8 sam)
|
||||||
|
{
|
||||||
|
switch (sam) {
|
||||||
|
case LOWPAN_IPHC_ADDR_00:
|
||||||
|
/* unspec address ::
|
||||||
|
* Do nothing, address is already ::
|
||||||
|
*/
|
||||||
|
break;
|
||||||
|
case LOWPAN_IPHC_ADDR_01:
|
||||||
|
/* TODO */
|
||||||
|
case LOWPAN_IPHC_ADDR_02:
|
||||||
|
/* TODO */
|
||||||
|
case LOWPAN_IPHC_ADDR_03:
|
||||||
|
/* TODO */
|
||||||
|
netdev_warn(skb->dev, "SAM value 0x%x not supported\n", sam);
|
||||||
|
return -EINVAL;
|
||||||
|
default:
|
||||||
|
pr_debug("Invalid sam value: 0x%x\n", sam);
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
raw_dump_inline(NULL,
|
||||||
|
"Reconstructed context based ipv6 src addr is",
|
||||||
|
ipaddr->s6_addr, 16);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr,
|
||||||
|
struct net_device *dev, skb_delivery_cb deliver_skb)
|
||||||
|
{
|
||||||
|
struct sk_buff *new;
|
||||||
|
int stat;
|
||||||
|
|
||||||
|
new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
|
||||||
|
GFP_ATOMIC);
|
||||||
|
kfree_skb(skb);
|
||||||
|
|
||||||
|
if (!new)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
skb_push(new, sizeof(struct ipv6hdr));
|
||||||
|
skb_reset_network_header(new);
|
||||||
|
skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr));
|
||||||
|
|
||||||
|
new->protocol = htons(ETH_P_IPV6);
|
||||||
|
new->pkt_type = PACKET_HOST;
|
||||||
|
new->dev = dev;
|
||||||
|
|
||||||
|
raw_dump_table(__func__, "raw skb data dump before receiving",
|
||||||
|
new->data, new->len);
|
||||||
|
|
||||||
|
stat = deliver_skb(new, dev);
|
||||||
|
|
||||||
|
kfree_skb(new);
|
||||||
|
|
||||||
|
return stat;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Uncompress function for multicast destination address,
|
||||||
|
* when M bit is set.
|
||||||
|
*/
|
||||||
|
static int
|
||||||
|
lowpan_uncompress_multicast_daddr(struct sk_buff *skb,
|
||||||
|
struct in6_addr *ipaddr,
|
||||||
|
const u8 dam)
|
||||||
|
{
|
||||||
|
bool fail;
|
||||||
|
|
||||||
|
switch (dam) {
|
||||||
|
case LOWPAN_IPHC_DAM_00:
|
||||||
|
/* 00: 128 bits. The full address
|
||||||
|
* is carried in-line.
|
||||||
|
*/
|
||||||
|
fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16);
|
||||||
|
break;
|
||||||
|
case LOWPAN_IPHC_DAM_01:
|
||||||
|
/* 01: 48 bits. The address takes
|
||||||
|
* the form ffXX::00XX:XXXX:XXXX.
|
||||||
|
*/
|
||||||
|
ipaddr->s6_addr[0] = 0xFF;
|
||||||
|
fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1);
|
||||||
|
fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[11], 5);
|
||||||
|
break;
|
||||||
|
case LOWPAN_IPHC_DAM_10:
|
||||||
|
/* 10: 32 bits. The address takes
|
||||||
|
* the form ffXX::00XX:XXXX.
|
||||||
|
*/
|
||||||
|
ipaddr->s6_addr[0] = 0xFF;
|
||||||
|
fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[1], 1);
|
||||||
|
fail |= lowpan_fetch_skb(skb, &ipaddr->s6_addr[13], 3);
|
||||||
|
break;
|
||||||
|
case LOWPAN_IPHC_DAM_11:
|
||||||
|
/* 11: 8 bits. The address takes
|
||||||
|
* the form ff02::00XX.
|
||||||
|
*/
|
||||||
|
ipaddr->s6_addr[0] = 0xFF;
|
||||||
|
ipaddr->s6_addr[1] = 0x02;
|
||||||
|
fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[15], 1);
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
pr_debug("DAM value has a wrong value: 0x%x\n", dam);
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (fail) {
|
||||||
|
pr_debug("Failed to fetch skb data\n");
|
||||||
|
return -EIO;
|
||||||
|
}
|
||||||
|
|
||||||
|
raw_dump_inline(NULL, "Reconstructed ipv6 multicast addr is",
|
||||||
|
ipaddr->s6_addr, 16);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int
|
||||||
|
uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh)
|
||||||
|
{
|
||||||
|
u8 tmp;
|
||||||
|
|
||||||
|
if (!uh)
|
||||||
|
goto err;
|
||||||
|
|
||||||
|
if (lowpan_fetch_skb_u8(skb, &tmp))
|
||||||
|
goto err;
|
||||||
|
|
||||||
|
if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
|
||||||
|
pr_debug("UDP header uncompression\n");
|
||||||
|
switch (tmp & LOWPAN_NHC_UDP_CS_P_11) {
|
||||||
|
case LOWPAN_NHC_UDP_CS_P_00:
|
||||||
|
memcpy(&uh->source, &skb->data[0], 2);
|
||||||
|
memcpy(&uh->dest, &skb->data[2], 2);
|
||||||
|
skb_pull(skb, 4);
|
||||||
|
break;
|
||||||
|
case LOWPAN_NHC_UDP_CS_P_01:
|
||||||
|
memcpy(&uh->source, &skb->data[0], 2);
|
||||||
|
uh->dest =
|
||||||
|
skb->data[2] + LOWPAN_NHC_UDP_8BIT_PORT;
|
||||||
|
skb_pull(skb, 3);
|
||||||
|
break;
|
||||||
|
case LOWPAN_NHC_UDP_CS_P_10:
|
||||||
|
uh->source = skb->data[0] + LOWPAN_NHC_UDP_8BIT_PORT;
|
||||||
|
memcpy(&uh->dest, &skb->data[1], 2);
|
||||||
|
skb_pull(skb, 3);
|
||||||
|
break;
|
||||||
|
case LOWPAN_NHC_UDP_CS_P_11:
|
||||||
|
uh->source =
|
||||||
|
LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] >> 4);
|
||||||
|
uh->dest =
|
||||||
|
LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] & 0x0f);
|
||||||
|
skb_pull(skb, 1);
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
pr_debug("ERROR: unknown UDP format\n");
|
||||||
|
goto err;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
|
||||||
|
uh->source, uh->dest);
|
||||||
|
|
||||||
|
/* copy checksum */
|
||||||
|
memcpy(&uh->check, &skb->data[0], 2);
|
||||||
|
skb_pull(skb, 2);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* UDP lenght needs to be infered from the lower layers
|
||||||
|
* here, we obtain the hint from the remaining size of the
|
||||||
|
* frame
|
||||||
|
*/
|
||||||
|
uh->len = htons(skb->len + sizeof(struct udphdr));
|
||||||
|
pr_debug("uncompressed UDP length: src = %d", uh->len);
|
||||||
|
} else {
|
||||||
|
pr_debug("ERROR: unsupported NH format\n");
|
||||||
|
goto err;
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
err:
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* TTL uncompression values */
|
||||||
|
static const u8 lowpan_ttl_values[] = { 0, 1, 64, 255 };
|
||||||
|
|
||||||
|
int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
|
||||||
|
const u8 *saddr, const u8 saddr_type, const u8 saddr_len,
|
||||||
|
const u8 *daddr, const u8 daddr_type, const u8 daddr_len,
|
||||||
|
u8 iphc0, u8 iphc1, skb_delivery_cb deliver_skb)
|
||||||
|
{
|
||||||
|
struct ipv6hdr hdr = {};
|
||||||
|
u8 tmp, num_context = 0;
|
||||||
|
int err;
|
||||||
|
|
||||||
|
raw_dump_table(__func__, "raw skb data dump uncompressed",
|
||||||
|
skb->data, skb->len);
|
||||||
|
|
||||||
|
/* another if the CID flag is set */
|
||||||
|
if (iphc1 & LOWPAN_IPHC_CID) {
|
||||||
|
pr_debug("CID flag is set, increase header with one\n");
|
||||||
|
if (lowpan_fetch_skb_u8(skb, &num_context))
|
||||||
|
goto drop;
|
||||||
|
}
|
||||||
|
|
||||||
|
hdr.version = 6;
|
||||||
|
|
||||||
|
/* Traffic Class and Flow Label */
|
||||||
|
switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
|
||||||
|
/*
|
||||||
|
* Traffic Class and FLow Label carried in-line
|
||||||
|
* ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
|
||||||
|
*/
|
||||||
|
case 0: /* 00b */
|
||||||
|
if (lowpan_fetch_skb_u8(skb, &tmp))
|
||||||
|
goto drop;
|
||||||
|
|
||||||
|
memcpy(&hdr.flow_lbl, &skb->data[0], 3);
|
||||||
|
skb_pull(skb, 3);
|
||||||
|
hdr.priority = ((tmp >> 2) & 0x0f);
|
||||||
|
hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
|
||||||
|
(hdr.flow_lbl[0] & 0x0f);
|
||||||
|
break;
|
||||||
|
/*
|
||||||
|
* Traffic class carried in-line
|
||||||
|
* ECN + DSCP (1 byte), Flow Label is elided
|
||||||
|
*/
|
||||||
|
case 2: /* 10b */
|
||||||
|
if (lowpan_fetch_skb_u8(skb, &tmp))
|
||||||
|
goto drop;
|
||||||
|
|
||||||
|
hdr.priority = ((tmp >> 2) & 0x0f);
|
||||||
|
hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
|
||||||
|
break;
|
||||||
|
/*
|
||||||
|
* Flow Label carried in-line
|
||||||
|
* ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
|
||||||
|
*/
|
||||||
|
case 1: /* 01b */
|
||||||
|
if (lowpan_fetch_skb_u8(skb, &tmp))
|
||||||
|
goto drop;
|
||||||
|
|
||||||
|
hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
|
||||||
|
memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
|
||||||
|
skb_pull(skb, 2);
|
||||||
|
break;
|
||||||
|
/* Traffic Class and Flow Label are elided */
|
||||||
|
case 3: /* 11b */
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Next Header */
|
||||||
|
if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
|
||||||
|
/* Next header is carried inline */
|
||||||
|
if (lowpan_fetch_skb_u8(skb, &(hdr.nexthdr)))
|
||||||
|
goto drop;
|
||||||
|
|
||||||
|
pr_debug("NH flag is set, next header carried inline: %02x\n",
|
||||||
|
hdr.nexthdr);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Hop Limit */
|
||||||
|
if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
|
||||||
|
hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
|
||||||
|
else {
|
||||||
|
if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit)))
|
||||||
|
goto drop;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Extract SAM to the tmp variable */
|
||||||
|
tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
|
||||||
|
|
||||||
|
if (iphc1 & LOWPAN_IPHC_SAC) {
|
||||||
|
/* Source address context based uncompression */
|
||||||
|
pr_debug("SAC bit is set. Handle context based source address.\n");
|
||||||
|
err = uncompress_context_based_src_addr(
|
||||||
|
skb, &hdr.saddr, tmp);
|
||||||
|
} else {
|
||||||
|
/* Source address uncompression */
|
||||||
|
pr_debug("source address stateless compression\n");
|
||||||
|
err = uncompress_addr(skb, &hdr.saddr, tmp, saddr,
|
||||||
|
saddr_type, saddr_len);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Check on error of previous branch */
|
||||||
|
if (err)
|
||||||
|
goto drop;
|
||||||
|
|
||||||
|
/* Extract DAM to the tmp variable */
|
||||||
|
tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
|
||||||
|
|
||||||
|
/* check for Multicast Compression */
|
||||||
|
if (iphc1 & LOWPAN_IPHC_M) {
|
||||||
|
if (iphc1 & LOWPAN_IPHC_DAC) {
|
||||||
|
pr_debug("dest: context-based mcast compression\n");
|
||||||
|
/* TODO: implement this */
|
||||||
|
} else {
|
||||||
|
err = lowpan_uncompress_multicast_daddr(
|
||||||
|
skb, &hdr.daddr, tmp);
|
||||||
|
if (err)
|
||||||
|
goto drop;
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
err = uncompress_addr(skb, &hdr.daddr, tmp, daddr,
|
||||||
|
daddr_type, daddr_len);
|
||||||
|
pr_debug("dest: stateless compression mode %d dest %pI6c\n",
|
||||||
|
tmp, &hdr.daddr);
|
||||||
|
if (err)
|
||||||
|
goto drop;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* UDP data uncompression */
|
||||||
|
if (iphc0 & LOWPAN_IPHC_NH_C) {
|
||||||
|
struct udphdr uh;
|
||||||
|
struct sk_buff *new;
|
||||||
|
if (uncompress_udp_header(skb, &uh))
|
||||||
|
goto drop;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* replace the compressed UDP head by the uncompressed UDP
|
||||||
|
* header
|
||||||
|
*/
|
||||||
|
new = skb_copy_expand(skb, sizeof(struct udphdr),
|
||||||
|
skb_tailroom(skb), GFP_ATOMIC);
|
||||||
|
kfree_skb(skb);
|
||||||
|
|
||||||
|
if (!new)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
skb = new;
|
||||||
|
|
||||||
|
skb_push(skb, sizeof(struct udphdr));
|
||||||
|
skb_reset_transport_header(skb);
|
||||||
|
skb_copy_to_linear_data(skb, &uh, sizeof(struct udphdr));
|
||||||
|
|
||||||
|
raw_dump_table(__func__, "raw UDP header dump",
|
||||||
|
(u8 *)&uh, sizeof(uh));
|
||||||
|
|
||||||
|
hdr.nexthdr = UIP_PROTO_UDP;
|
||||||
|
}
|
||||||
|
|
||||||
|
hdr.payload_len = htons(skb->len);
|
||||||
|
|
||||||
|
pr_debug("skb headroom size = %d, data length = %d\n",
|
||||||
|
skb_headroom(skb), skb->len);
|
||||||
|
|
||||||
|
pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
|
||||||
|
"nexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n",
|
||||||
|
hdr.version, ntohs(hdr.payload_len), hdr.nexthdr,
|
||||||
|
hdr.hop_limit, &hdr.daddr);
|
||||||
|
|
||||||
|
raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
|
||||||
|
sizeof(hdr));
|
||||||
|
|
||||||
|
return skb_deliver(skb, &hdr, dev, deliver_skb);
|
||||||
|
|
||||||
|
drop:
|
||||||
|
kfree_skb(skb);
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(lowpan_process_data);
|
||||||
|
|
||||||
|
static u8 lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift,
|
||||||
|
const struct in6_addr *ipaddr,
|
||||||
|
const unsigned char *lladdr)
|
||||||
|
{
|
||||||
|
u8 val = 0;
|
||||||
|
|
||||||
|
if (is_addr_mac_addr_based(ipaddr, lladdr)) {
|
||||||
|
val = 3; /* 0-bits */
|
||||||
|
pr_debug("address compression 0 bits\n");
|
||||||
|
} else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
|
||||||
|
/* compress IID to 16 bits xxxx::XXXX */
|
||||||
|
memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2);
|
||||||
|
*hc06_ptr += 2;
|
||||||
|
val = 2; /* 16-bits */
|
||||||
|
raw_dump_inline(NULL, "Compressed ipv6 addr is (16 bits)",
|
||||||
|
*hc06_ptr - 2, 2);
|
||||||
|
} else {
|
||||||
|
/* do not compress IID => xxxx::IID */
|
||||||
|
memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8);
|
||||||
|
*hc06_ptr += 8;
|
||||||
|
val = 1; /* 64-bits */
|
||||||
|
raw_dump_inline(NULL, "Compressed ipv6 addr is (64 bits)",
|
||||||
|
*hc06_ptr - 8, 8);
|
||||||
|
}
|
||||||
|
|
||||||
|
return rol8(val, shift);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
|
||||||
|
{
|
||||||
|
struct udphdr *uh = udp_hdr(skb);
|
||||||
|
|
||||||
|
if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) ==
|
||||||
|
LOWPAN_NHC_UDP_4BIT_PORT) &&
|
||||||
|
((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) ==
|
||||||
|
LOWPAN_NHC_UDP_4BIT_PORT)) {
|
||||||
|
pr_debug("UDP header: both ports compression to 4 bits\n");
|
||||||
|
**hc06_ptr = LOWPAN_NHC_UDP_CS_P_11;
|
||||||
|
**(hc06_ptr + 1) = /* subtraction is faster */
|
||||||
|
(u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) +
|
||||||
|
((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4));
|
||||||
|
*hc06_ptr += 2;
|
||||||
|
} else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) ==
|
||||||
|
LOWPAN_NHC_UDP_8BIT_PORT) {
|
||||||
|
pr_debug("UDP header: remove 8 bits of dest\n");
|
||||||
|
**hc06_ptr = LOWPAN_NHC_UDP_CS_P_01;
|
||||||
|
memcpy(*hc06_ptr + 1, &uh->source, 2);
|
||||||
|
**(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT);
|
||||||
|
*hc06_ptr += 4;
|
||||||
|
} else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) ==
|
||||||
|
LOWPAN_NHC_UDP_8BIT_PORT) {
|
||||||
|
pr_debug("UDP header: remove 8 bits of source\n");
|
||||||
|
**hc06_ptr = LOWPAN_NHC_UDP_CS_P_10;
|
||||||
|
memcpy(*hc06_ptr + 1, &uh->dest, 2);
|
||||||
|
**(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT);
|
||||||
|
*hc06_ptr += 4;
|
||||||
|
} else {
|
||||||
|
pr_debug("UDP header: can't compress\n");
|
||||||
|
**hc06_ptr = LOWPAN_NHC_UDP_CS_P_00;
|
||||||
|
memcpy(*hc06_ptr + 1, &uh->source, 2);
|
||||||
|
memcpy(*hc06_ptr + 3, &uh->dest, 2);
|
||||||
|
*hc06_ptr += 5;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* checksum is always inline */
|
||||||
|
memcpy(*hc06_ptr, &uh->check, 2);
|
||||||
|
*hc06_ptr += 2;
|
||||||
|
|
||||||
|
/* skip the UDP header */
|
||||||
|
skb_pull(skb, sizeof(struct udphdr));
|
||||||
|
}
|
||||||
|
|
||||||
|
int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
|
||||||
|
unsigned short type, const void *_daddr,
|
||||||
|
const void *_saddr, unsigned int len)
|
||||||
|
{
|
||||||
|
u8 tmp, iphc0, iphc1, *hc06_ptr;
|
||||||
|
struct ipv6hdr *hdr;
|
||||||
|
u8 head[100] = {};
|
||||||
|
|
||||||
|
if (type != ETH_P_IPV6)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
hdr = ipv6_hdr(skb);
|
||||||
|
hc06_ptr = head + 2;
|
||||||
|
|
||||||
|
pr_debug("IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
|
||||||
|
"\tnexthdr = 0x%02x\n\thop_lim = %d\n\tdest = %pI6c\n",
|
||||||
|
hdr->version, ntohs(hdr->payload_len), hdr->nexthdr,
|
||||||
|
hdr->hop_limit, &hdr->daddr);
|
||||||
|
|
||||||
|
raw_dump_table(__func__, "raw skb network header dump",
|
||||||
|
skb_network_header(skb), sizeof(struct ipv6hdr));
|
||||||
|
|
||||||
|
/*
|
||||||
|
* As we copy some bit-length fields, in the IPHC encoding bytes,
|
||||||
|
* we sometimes use |=
|
||||||
|
* If the field is 0, and the current bit value in memory is 1,
|
||||||
|
* this does not work. We therefore reset the IPHC encoding here
|
||||||
|
*/
|
||||||
|
iphc0 = LOWPAN_DISPATCH_IPHC;
|
||||||
|
iphc1 = 0;
|
||||||
|
|
||||||
|
/* TODO: context lookup */
|
||||||
|
|
||||||
|
raw_dump_inline(__func__, "saddr",
|
||||||
|
(unsigned char *)_saddr, IEEE802154_ADDR_LEN);
|
||||||
|
raw_dump_inline(__func__, "daddr",
|
||||||
|
(unsigned char *)_daddr, IEEE802154_ADDR_LEN);
|
||||||
|
|
||||||
|
raw_dump_table(__func__,
|
||||||
|
"sending raw skb network uncompressed packet",
|
||||||
|
skb->data, skb->len);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Traffic class, flow label
|
||||||
|
* If flow label is 0, compress it. If traffic class is 0, compress it
|
||||||
|
* We have to process both in the same time as the offset of traffic
|
||||||
|
* class depends on the presence of version and flow label
|
||||||
|
*/
|
||||||
|
|
||||||
|
/* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
|
||||||
|
tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
|
||||||
|
tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
|
||||||
|
|
||||||
|
if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
|
||||||
|
(hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
|
||||||
|
/* flow label can be compressed */
|
||||||
|
iphc0 |= LOWPAN_IPHC_FL_C;
|
||||||
|
if ((hdr->priority == 0) &&
|
||||||
|
((hdr->flow_lbl[0] & 0xF0) == 0)) {
|
||||||
|
/* compress (elide) all */
|
||||||
|
iphc0 |= LOWPAN_IPHC_TC_C;
|
||||||
|
} else {
|
||||||
|
/* compress only the flow label */
|
||||||
|
*hc06_ptr = tmp;
|
||||||
|
hc06_ptr += 1;
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
/* Flow label cannot be compressed */
|
||||||
|
if ((hdr->priority == 0) &&
|
||||||
|
((hdr->flow_lbl[0] & 0xF0) == 0)) {
|
||||||
|
/* compress only traffic class */
|
||||||
|
iphc0 |= LOWPAN_IPHC_TC_C;
|
||||||
|
*hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
|
||||||
|
memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
|
||||||
|
hc06_ptr += 3;
|
||||||
|
} else {
|
||||||
|
/* compress nothing */
|
||||||
|
memcpy(hc06_ptr, &hdr, 4);
|
||||||
|
/* replace the top byte with new ECN | DSCP format */
|
||||||
|
*hc06_ptr = tmp;
|
||||||
|
hc06_ptr += 4;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* NOTE: payload length is always compressed */
|
||||||
|
|
||||||
|
/* Next Header is compress if UDP */
|
||||||
|
if (hdr->nexthdr == UIP_PROTO_UDP)
|
||||||
|
iphc0 |= LOWPAN_IPHC_NH_C;
|
||||||
|
|
||||||
|
if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
|
||||||
|
*hc06_ptr = hdr->nexthdr;
|
||||||
|
hc06_ptr += 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Hop limit
|
||||||
|
* if 1: compress, encoding is 01
|
||||||
|
* if 64: compress, encoding is 10
|
||||||
|
* if 255: compress, encoding is 11
|
||||||
|
* else do not compress
|
||||||
|
*/
|
||||||
|
switch (hdr->hop_limit) {
|
||||||
|
case 1:
|
||||||
|
iphc0 |= LOWPAN_IPHC_TTL_1;
|
||||||
|
break;
|
||||||
|
case 64:
|
||||||
|
iphc0 |= LOWPAN_IPHC_TTL_64;
|
||||||
|
break;
|
||||||
|
case 255:
|
||||||
|
iphc0 |= LOWPAN_IPHC_TTL_255;
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
*hc06_ptr = hdr->hop_limit;
|
||||||
|
hc06_ptr += 1;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* source address compression */
|
||||||
|
if (is_addr_unspecified(&hdr->saddr)) {
|
||||||
|
pr_debug("source address is unspecified, setting SAC\n");
|
||||||
|
iphc1 |= LOWPAN_IPHC_SAC;
|
||||||
|
/* TODO: context lookup */
|
||||||
|
} else if (is_addr_link_local(&hdr->saddr)) {
|
||||||
|
iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
|
||||||
|
LOWPAN_IPHC_SAM_BIT, &hdr->saddr, _saddr);
|
||||||
|
pr_debug("source address unicast link-local %pI6c "
|
||||||
|
"iphc1 0x%02x\n", &hdr->saddr, iphc1);
|
||||||
|
} else {
|
||||||
|
pr_debug("send the full source address\n");
|
||||||
|
memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
|
||||||
|
hc06_ptr += 16;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* destination address compression */
|
||||||
|
if (is_addr_mcast(&hdr->daddr)) {
|
||||||
|
pr_debug("destination address is multicast: ");
|
||||||
|
iphc1 |= LOWPAN_IPHC_M;
|
||||||
|
if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
|
||||||
|
pr_debug("compressed to 1 octet\n");
|
||||||
|
iphc1 |= LOWPAN_IPHC_DAM_11;
|
||||||
|
/* use last byte */
|
||||||
|
*hc06_ptr = hdr->daddr.s6_addr[15];
|
||||||
|
hc06_ptr += 1;
|
||||||
|
} else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
|
||||||
|
pr_debug("compressed to 4 octets\n");
|
||||||
|
iphc1 |= LOWPAN_IPHC_DAM_10;
|
||||||
|
/* second byte + the last three */
|
||||||
|
*hc06_ptr = hdr->daddr.s6_addr[1];
|
||||||
|
memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
|
||||||
|
hc06_ptr += 4;
|
||||||
|
} else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
|
||||||
|
pr_debug("compressed to 6 octets\n");
|
||||||
|
iphc1 |= LOWPAN_IPHC_DAM_01;
|
||||||
|
/* second byte + the last five */
|
||||||
|
*hc06_ptr = hdr->daddr.s6_addr[1];
|
||||||
|
memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
|
||||||
|
hc06_ptr += 6;
|
||||||
|
} else {
|
||||||
|
pr_debug("using full address\n");
|
||||||
|
iphc1 |= LOWPAN_IPHC_DAM_00;
|
||||||
|
memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
|
||||||
|
hc06_ptr += 16;
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
/* TODO: context lookup */
|
||||||
|
if (is_addr_link_local(&hdr->daddr)) {
|
||||||
|
iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
|
||||||
|
LOWPAN_IPHC_DAM_BIT, &hdr->daddr, _daddr);
|
||||||
|
pr_debug("dest address unicast link-local %pI6c "
|
||||||
|
"iphc1 0x%02x\n", &hdr->daddr, iphc1);
|
||||||
|
} else {
|
||||||
|
pr_debug("dest address unicast %pI6c\n", &hdr->daddr);
|
||||||
|
memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
|
||||||
|
hc06_ptr += 16;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* UDP header compression */
|
||||||
|
if (hdr->nexthdr == UIP_PROTO_UDP)
|
||||||
|
compress_udp_header(&hc06_ptr, skb);
|
||||||
|
|
||||||
|
head[0] = iphc0;
|
||||||
|
head[1] = iphc1;
|
||||||
|
|
||||||
|
skb_pull(skb, sizeof(struct ipv6hdr));
|
||||||
|
skb_reset_transport_header(skb);
|
||||||
|
memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
|
||||||
|
skb_reset_network_header(skb);
|
||||||
|
|
||||||
|
pr_debug("header len %d skb %u\n", (int)(hc06_ptr - head), skb->len);
|
||||||
|
|
||||||
|
raw_dump_table(__func__, "raw skb data dump compressed",
|
||||||
|
skb->data, skb->len);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(lowpan_header_compress);
|
|
@ -1,5 +1,5 @@
|
||||||
obj-$(CONFIG_IEEE802154) += ieee802154.o af_802154.o
|
obj-$(CONFIG_IEEE802154) += ieee802154.o af_802154.o
|
||||||
obj-$(CONFIG_IEEE802154_6LOWPAN) += 6lowpan.o
|
obj-$(CONFIG_IEEE802154_6LOWPAN) += 6lowpan.o 6lowpan_iphc.o
|
||||||
|
|
||||||
ieee802154-y := netlink.o nl-mac.o nl-phy.o nl_policy.o wpan-class.o
|
ieee802154-y := netlink.o nl-mac.o nl-phy.o nl_policy.o wpan-class.o
|
||||||
af_802154-y := af_ieee802154.o raw.o dgram.o
|
af_802154-y := af_ieee802154.o raw.o dgram.o
|
||||||
|
|
Loading…
Reference in New Issue