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Message-ID: <20131208143846.GA25486@omega>
Date: Sun, 8 Dec 2013 15:38:46 +0100
From: Alexander Aring <alex.aring@...il.com>
To: Jukka Rissanen <jukka.rissanen@...ux.intel.com>
Cc: netdev@...r.kernel.org, linux-zigbee-devel@...ts.sourceforge.net
Subject: Re: [PATCH net-next] 6lowpan: Moving generic compression code into
6lowpan_iphc.c
On Sat, Dec 07, 2013 at 08:02:50PM +0200, Jukka Rissanen wrote:
> 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@...ux.intel.com>
> ---
> Hi,
>
> this is just refactoring code so that Bluetooth LE 6LoWPAN
> patches (sent to bluetooth mailing list) can use it.
> No functionality changes by this patch.
>
> Cheers,
> Jukka
>
> net/ieee802154/6lowpan.c | 753 ++-------------------------------------
> net/ieee802154/6lowpan.h | 32 ++
> net/ieee802154/6lowpan_iphc.c | 807 ++++++++++++++++++++++++++++++++++++++++++
> net/ieee802154/Makefile | 2 +-
> 4 files changed, 875 insertions(+), 719 deletions(-)
> create mode 100644 net/ieee802154/6lowpan_iphc.c
...
> @@ -485,181 +149,14 @@ static int lowpan_header_create(struct sk_buff *skb,
> return 0;
>
> 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)
> saddr = dev->dev_addr;
>
> 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);
>
> - /*
> - * 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);
> + lowpan_header_compress(skb, dev, type, daddr, saddr, len);
okay, here we should check the return value for an error. Nevertheless,
the error handling is currently ignored in other functions like lowpan_rcv.
So I will prepare some patches to make a more functionality error handling.
- Alex
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