#include "nhc.h"
-/* Values of fields within the IPHC encoding first byte
- * (C stands for compressed and I for inline)
- */
-#define LOWPAN_IPHC_TF 0x18
+/* Values of fields within the IPHC encoding first byte */
+#define LOWPAN_IPHC_TF_MASK 0x18
+#define LOWPAN_IPHC_TF_00 0x00
+#define LOWPAN_IPHC_TF_01 0x08
+#define LOWPAN_IPHC_TF_10 0x10
+#define LOWPAN_IPHC_TF_11 0x18
+
+#define LOWPAN_IPHC_NH 0x04
-#define LOWPAN_IPHC_FL_C 0x10
-#define LOWPAN_IPHC_TC_C 0x08
-#define LOWPAN_IPHC_NH_C 0x04
-#define LOWPAN_IPHC_TTL_1 0x01
-#define LOWPAN_IPHC_TTL_64 0x02
-#define LOWPAN_IPHC_TTL_255 0x03
-#define LOWPAN_IPHC_TTL_I 0x00
+#define LOWPAN_IPHC_HLIM_MASK 0x03
+#define LOWPAN_IPHC_HLIM_00 0x00
+#define LOWPAN_IPHC_HLIM_01 0x01
+#define LOWPAN_IPHC_HLIM_10 0x02
+#define LOWPAN_IPHC_HLIM_11 0x03
/* Values of fields within the IPHC encoding second byte */
#define LOWPAN_IPHC_CID 0x80
-#define LOWPAN_IPHC_ADDR_00 0x00
-#define LOWPAN_IPHC_ADDR_01 0x01
-#define LOWPAN_IPHC_ADDR_02 0x02
-#define LOWPAN_IPHC_ADDR_03 0x03
-
#define LOWPAN_IPHC_SAC 0x40
-#define LOWPAN_IPHC_SAM 0x30
-#define LOWPAN_IPHC_SAM_BIT 4
+#define LOWPAN_IPHC_SAM_MASK 0x30
+#define LOWPAN_IPHC_SAM_00 0x00
+#define LOWPAN_IPHC_SAM_01 0x10
+#define LOWPAN_IPHC_SAM_10 0x20
+#define LOWPAN_IPHC_SAM_11 0x30
#define LOWPAN_IPHC_M 0x08
+
#define LOWPAN_IPHC_DAC 0x04
+
+#define LOWPAN_IPHC_DAM_MASK 0x03
#define LOWPAN_IPHC_DAM_00 0x00
#define LOWPAN_IPHC_DAM_01 0x01
#define LOWPAN_IPHC_DAM_10 0x02
#define LOWPAN_IPHC_DAM_11 0x03
-#define LOWPAN_IPHC_DAM_BIT 0
-
/* ipv6 address based on mac
* second bit-flip (Universe/Local) is done according RFC2464
*/
/* Uncompress address function for source and
* destination address(non-multicast).
*
- * address_mode is sam value or dam value.
+ * address_mode is the masked value for sam or dam value
*/
static int uncompress_addr(struct sk_buff *skb, const struct net_device *dev,
struct in6_addr *ipaddr, u8 address_mode,
bool fail;
switch (address_mode) {
- case LOWPAN_IPHC_ADDR_00:
+ /* SAM and DAM are the same here */
+ case LOWPAN_IPHC_DAM_00:
/* for global link addresses */
fail = lowpan_fetch_skb(skb, ipaddr->s6_addr, 16);
break;
- case LOWPAN_IPHC_ADDR_01:
+ case LOWPAN_IPHC_SAM_01:
+ case LOWPAN_IPHC_DAM_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:
+ case LOWPAN_IPHC_SAM_10:
+ case LOWPAN_IPHC_DAM_10:
/* fe:80::ff:fe00:XXXX */
ipaddr->s6_addr[0] = 0xFE;
ipaddr->s6_addr[1] = 0x80;
ipaddr->s6_addr[12] = 0xFE;
fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[14], 2);
break;
- case LOWPAN_IPHC_ADDR_03:
+ case LOWPAN_IPHC_SAM_11:
+ case LOWPAN_IPHC_DAM_11:
fail = false;
switch (lowpan_priv(dev)->lltype) {
case LOWPAN_LLTYPE_IEEE802154:
*/
static int uncompress_context_based_src_addr(struct sk_buff *skb,
struct in6_addr *ipaddr,
- const u8 sam)
+ u8 address_mode)
{
- switch (sam) {
- case LOWPAN_IPHC_ADDR_00:
+ switch (address_mode) {
+ case LOWPAN_IPHC_SAM_00:
/* unspec address ::
* Do nothing, address is already ::
*/
break;
- case LOWPAN_IPHC_ADDR_01:
+ case LOWPAN_IPHC_SAM_01:
/* TODO */
- case LOWPAN_IPHC_ADDR_02:
+ case LOWPAN_IPHC_SAM_10:
/* TODO */
- case LOWPAN_IPHC_ADDR_03:
+ case LOWPAN_IPHC_SAM_11:
/* TODO */
- netdev_warn(skb->dev, "SAM value 0x%x not supported\n", sam);
+ netdev_warn(skb->dev, "SAM value 0x%x not supported\n",
+ address_mode);
return -EINVAL;
default:
- pr_debug("Invalid sam value: 0x%x\n", sam);
+ pr_debug("Invalid sam value: 0x%x\n", address_mode);
return -EINVAL;
}
*/
static int lowpan_uncompress_multicast_daddr(struct sk_buff *skb,
struct in6_addr *ipaddr,
- const u8 dam)
+ u8 address_mode)
{
bool fail;
- switch (dam) {
+ switch (address_mode) {
case LOWPAN_IPHC_DAM_00:
/* 00: 128 bits. The full address
* is carried in-line.
fail = lowpan_fetch_skb(skb, &ipaddr->s6_addr[15], 1);
break;
default:
- pr_debug("DAM value has a wrong value: 0x%x\n", dam);
+ pr_debug("DAM value has a wrong value: 0x%x\n", address_mode);
return -EINVAL;
}
}
/* TTL uncompression values */
-static const u8 lowpan_ttl_values[] = { 0, 1, 64, 255 };
+static const u8 lowpan_ttl_values[] = {
+ [LOWPAN_IPHC_HLIM_01] = 1,
+ [LOWPAN_IPHC_HLIM_10] = 64,
+ [LOWPAN_IPHC_HLIM_11] = 255,
+};
int lowpan_header_decompress(struct sk_buff *skb, const struct net_device *dev,
const void *daddr, const void *saddr)
{
struct ipv6hdr hdr = {};
- u8 iphc0, iphc1, tmp, num_context = 0;
+ u8 iphc0, iphc1, tmp = 0;
int err;
raw_dump_table(__func__, "raw skb data dump uncompressed",
return -EINVAL;
/* 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(skb, &num_context, sizeof(num_context)))
- return -EINVAL;
- }
+ if (iphc1 & LOWPAN_IPHC_CID)
+ return -ENOTSUPP;
hdr.version = 6;
/* Traffic Class and Flow Label */
- switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
+ switch (iphc0 & LOWPAN_IPHC_TF_MASK) {
/* Traffic Class and FLow Label carried in-line
* ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
*/
- case 0: /* 00b */
+ case LOWPAN_IPHC_TF_00:
if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp)))
return -EINVAL;
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(skb, &tmp, sizeof(tmp)))
- return -EINVAL;
-
- 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 */
+ case LOWPAN_IPHC_TF_01:
if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp)))
return -EINVAL;
memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
skb_pull(skb, 2);
break;
+ /* Traffic class carried in-line
+ * ECN + DSCP (1 byte), Flow Label is elided
+ */
+ case LOWPAN_IPHC_TF_10:
+ if (lowpan_fetch_skb(skb, &tmp, sizeof(tmp)))
+ return -EINVAL;
+
+ hdr.priority = ((tmp >> 2) & 0x0f);
+ hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
+ break;
/* Traffic Class and Flow Label are elided */
- case 3: /* 11b */
+ case LOWPAN_IPHC_TF_11:
break;
default:
+ WARN_ON_ONCE(1);
break;
}
/* Next Header */
- if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
+ if (!(iphc0 & LOWPAN_IPHC_NH)) {
/* Next header is carried inline */
if (lowpan_fetch_skb(skb, &hdr.nexthdr, sizeof(hdr.nexthdr)))
return -EINVAL;
}
/* Hop Limit */
- if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) {
- hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
+ if ((iphc0 & LOWPAN_IPHC_HLIM_MASK) != LOWPAN_IPHC_HLIM_00) {
+ hdr.hop_limit = lowpan_ttl_values[iphc0 & LOWPAN_IPHC_HLIM_MASK];
} else {
if (lowpan_fetch_skb(skb, &hdr.hop_limit,
sizeof(hdr.hop_limit)))
return -EINVAL;
}
- /* 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);
+ err = uncompress_context_based_src_addr(skb, &hdr.saddr,
+ iphc1 & LOWPAN_IPHC_SAM_MASK);
} else {
/* Source address uncompression */
pr_debug("source address stateless compression\n");
- err = uncompress_addr(skb, dev, &hdr.saddr, tmp, saddr);
+ err = uncompress_addr(skb, dev, &hdr.saddr,
+ iphc1 & LOWPAN_IPHC_SAM_MASK, saddr);
}
/* Check on error of previous branch */
if (err)
return -EINVAL;
- /* 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) {
/* TODO: implement this */
} else {
err = lowpan_uncompress_multicast_daddr(skb, &hdr.daddr,
- tmp);
+ iphc1 & LOWPAN_IPHC_DAM_MASK);
if (err)
return -EINVAL;
}
} else {
- err = uncompress_addr(skb, dev, &hdr.daddr, tmp, daddr);
+ err = uncompress_addr(skb, dev, &hdr.daddr,
+ iphc1 & LOWPAN_IPHC_DAM_MASK, daddr);
pr_debug("dest: stateless compression mode %d dest %pI6c\n",
- tmp, &hdr.daddr);
+ iphc1 & LOWPAN_IPHC_DAM_MASK, &hdr.daddr);
if (err)
return -EINVAL;
}
/* Next header data uncompression */
- if (iphc0 & LOWPAN_IPHC_NH_C) {
+ if (iphc0 & LOWPAN_IPHC_NH) {
err = lowpan_nhc_do_uncompression(skb, dev, &hdr);
if (err < 0)
return err;
}
EXPORT_SYMBOL_GPL(lowpan_header_decompress);
-static u8 lowpan_compress_addr_64(u8 **hc_ptr, u8 shift,
- const struct in6_addr *ipaddr,
- const unsigned char *lladdr)
+static const u8 lowpan_iphc_dam_to_sam_value[] = {
+ [LOWPAN_IPHC_DAM_00] = LOWPAN_IPHC_SAM_00,
+ [LOWPAN_IPHC_DAM_01] = LOWPAN_IPHC_SAM_01,
+ [LOWPAN_IPHC_DAM_10] = LOWPAN_IPHC_SAM_10,
+ [LOWPAN_IPHC_DAM_11] = LOWPAN_IPHC_SAM_11,
+};
+
+static u8 lowpan_compress_addr_64(u8 **hc_ptr, const struct in6_addr *ipaddr,
+ const unsigned char *lladdr, bool sam)
{
- u8 val = 0;
+ u8 dam = LOWPAN_IPHC_DAM_00;
if (is_addr_mac_addr_based(ipaddr, lladdr)) {
- val = 3; /* 0-bits */
+ dam = LOWPAN_IPHC_DAM_11; /* 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 */
lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[7], 2);
- val = 2; /* 16-bits */
+ dam = LOWPAN_IPHC_DAM_10; /* 16-bits */
raw_dump_inline(NULL, "Compressed ipv6 addr is (16 bits)",
*hc_ptr - 2, 2);
} else {
/* do not compress IID => xxxx::IID */
lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr16[4], 8);
- val = 1; /* 64-bits */
+ dam = LOWPAN_IPHC_DAM_01; /* 64-bits */
raw_dump_inline(NULL, "Compressed ipv6 addr is (64 bits)",
*hc_ptr - 8, 8);
}
- return rol8(val, shift);
+ if (sam)
+ return lowpan_iphc_dam_to_sam_value[dam];
+ else
+ return dam;
}
int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev,
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;
+ iphc0 |= LOWPAN_IPHC_TF_10;
if ((hdr->priority == 0) &&
((hdr->flow_lbl[0] & 0xF0) == 0)) {
/* compress (elide) all */
- iphc0 |= LOWPAN_IPHC_TC_C;
+ iphc0 |= LOWPAN_IPHC_TF_11;
} else {
/* compress only the flow label */
*hc_ptr = tmp;
if ((hdr->priority == 0) &&
((hdr->flow_lbl[0] & 0xF0) == 0)) {
/* compress only traffic class */
- iphc0 |= LOWPAN_IPHC_TC_C;
+ iphc0 |= LOWPAN_IPHC_TF_01;
*hc_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
memcpy(hc_ptr + 1, &hdr->flow_lbl[1], 2);
hc_ptr += 3;
lowpan_push_hc_data(&hc_ptr, &hdr->nexthdr,
sizeof(hdr->nexthdr));
else
- iphc0 |= LOWPAN_IPHC_NH_C;
+ iphc0 |= LOWPAN_IPHC_NH;
/* Hop limit
* if 1: compress, encoding is 01
*/
switch (hdr->hop_limit) {
case 1:
- iphc0 |= LOWPAN_IPHC_TTL_1;
+ iphc0 |= LOWPAN_IPHC_HLIM_01;
break;
case 64:
- iphc0 |= LOWPAN_IPHC_TTL_64;
+ iphc0 |= LOWPAN_IPHC_HLIM_10;
break;
case 255:
- iphc0 |= LOWPAN_IPHC_TTL_255;
+ iphc0 |= LOWPAN_IPHC_HLIM_11;
break;
default:
lowpan_push_hc_data(&hc_ptr, &hdr->hop_limit,
iphc1 |= LOWPAN_IPHC_SAC;
} else {
if (addr_type & IPV6_ADDR_LINKLOCAL) {
- iphc1 |= lowpan_compress_addr_64(&hc_ptr,
- LOWPAN_IPHC_SAM_BIT,
- &hdr->saddr, saddr);
+ iphc1 |= lowpan_compress_addr_64(&hc_ptr, &hdr->saddr,
+ saddr, true);
pr_debug("source address unicast link-local %pI6c iphc1 0x%02x\n",
&hdr->saddr, iphc1);
} else {
} else {
if (addr_type & IPV6_ADDR_LINKLOCAL) {
/* TODO: context lookup */
- iphc1 |= lowpan_compress_addr_64(&hc_ptr,
- LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr);
+ iphc1 |= lowpan_compress_addr_64(&hc_ptr, &hdr->daddr,
+ daddr, false);
pr_debug("dest address unicast link-local %pI6c "
"iphc1 0x%02x\n", &hdr->daddr, iphc1);
} else {
}
/* next header compression */
- if (iphc0 & LOWPAN_IPHC_NH_C) {
+ if (iphc0 & LOWPAN_IPHC_NH) {
ret = lowpan_nhc_do_compression(skb, hdr, &hc_ptr);
if (ret < 0)
return ret;
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