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-rw-r--r--net/6lowpan/iphc.c114
1 files changed, 52 insertions, 62 deletions
diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
index 211b5686d719..a1b7117a9600 100644
--- a/net/6lowpan/iphc.c
+++ b/net/6lowpan/iphc.c
@@ -3,8 +3,7 @@
* written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
*/
-/*
- * Based on patches from Jon Smirl <jonsmirl@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
@@ -58,16 +57,15 @@
#include <net/ipv6.h>
#include <net/af_ieee802154.h>
-/*
- * Uncompress address function for source and
+/* 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)
+ struct in6_addr *ipaddr, const u8 address_mode,
+ const u8 *lladdr, const u8 addr_type,
+ const u8 addr_len)
{
bool fail;
@@ -140,13 +138,12 @@ static int uncompress_addr(struct sk_buff *skb,
return 0;
}
-/*
- * Uncompress address function for source context
+/* 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)
+ struct in6_addr *ipaddr,
+ const u8 sam)
{
switch (sam) {
case LOWPAN_IPHC_ADDR_00:
@@ -175,13 +172,13 @@ static int uncompress_context_based_src_addr(struct sk_buff *skb,
}
static int skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr,
- struct net_device *dev, skb_delivery_cb deliver_skb)
+ 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);
+ new = skb_copy_expand(skb, sizeof(struct ipv6hdr),
+ skb_tailroom(skb), GFP_ATOMIC);
kfree_skb(skb);
if (!new)
@@ -196,7 +193,7 @@ static int skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr,
new->dev = dev;
raw_dump_table(__func__, "raw skb data dump before receiving",
- new->data, new->len);
+ new->data, new->len);
stat = deliver_skb(new, dev);
@@ -210,8 +207,8 @@ static int skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr,
*/
static int
lowpan_uncompress_multicast_daddr(struct sk_buff *skb,
- struct in6_addr *ipaddr,
- const u8 dam)
+ struct in6_addr *ipaddr,
+ const u8 dam)
{
bool fail;
@@ -300,7 +297,6 @@ uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh)
default:
pr_debug("ERROR: unknown UDP format\n");
goto err;
- break;
}
pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
@@ -314,8 +310,7 @@ uncompress_udp_header(struct sk_buff *skb, struct udphdr *uh)
fail |= lowpan_fetch_skb(skb, &uh->check, 2);
}
- /*
- * UDP lenght needs to be infered from the lower layers
+ /* UDP lenght needs to be infered from the lower layers
* here, we obtain the hint from the remaining size of the
* frame
*/
@@ -338,16 +333,17 @@ err:
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)
+ 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);
+ skb->data, skb->len);
/* another if the CID flag is set */
if (iphc1 & LOWPAN_IPHC_CID) {
@@ -360,8 +356,7 @@ int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
/* Traffic Class and Flow Label */
switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
- /*
- * Traffic Class and FLow Label carried in-line
+ /* Traffic Class and FLow Label carried in-line
* ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
*/
case 0: /* 00b */
@@ -374,8 +369,7 @@ int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
(hdr.flow_lbl[0] & 0x0f);
break;
- /*
- * Traffic class carried in-line
+ /* Traffic class carried in-line
* ECN + DSCP (1 byte), Flow Label is elided
*/
case 2: /* 10b */
@@ -385,8 +379,7 @@ int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
hdr.priority = ((tmp >> 2) & 0x0f);
hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
break;
- /*
- * Flow Label carried in-line
+ /* Flow Label carried in-line
* ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
*/
case 1: /* 01b */
@@ -415,9 +408,9 @@ int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
}
/* Hop Limit */
- if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
+ if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I) {
hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
- else {
+ } else {
if (lowpan_fetch_skb_u8(skb, &(hdr.hop_limit)))
goto drop;
}
@@ -429,12 +422,12 @@ int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
/* 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);
+ 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);
+ saddr_type, saddr_len);
}
/* Check on error of previous branch */
@@ -457,9 +450,9 @@ int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
}
} else {
err = uncompress_addr(skb, &hdr.daddr, tmp, daddr,
- daddr_type, daddr_len);
+ daddr_type, daddr_len);
pr_debug("dest: stateless compression mode %d dest %pI6c\n",
- tmp, &hdr.daddr);
+ tmp, &hdr.daddr);
if (err)
goto drop;
}
@@ -468,11 +461,11 @@ int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
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
+ /* replace the compressed UDP head by the uncompressed UDP
* header
*/
new = skb_copy_expand(skb, sizeof(struct udphdr),
@@ -489,7 +482,7 @@ int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
skb_copy_to_linear_data(skb, &uh, sizeof(struct udphdr));
raw_dump_table(__func__, "raw UDP header dump",
- (u8 *)&uh, sizeof(uh));
+ (u8 *)&uh, sizeof(uh));
hdr.nexthdr = UIP_PROTO_UDP;
}
@@ -504,8 +497,8 @@ int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
hdr.version, ntohs(hdr.payload_len), hdr.nexthdr,
hdr.hop_limit, &hdr.daddr);
- raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
- sizeof(hdr));
+ raw_dump_table(__func__, "raw header dump",
+ (u8 *)&hdr, sizeof(hdr));
return skb_deliver(skb, &hdr, dev, deliver_skb);
@@ -516,8 +509,8 @@ drop:
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)
+ const struct in6_addr *ipaddr,
+ const unsigned char *lladdr)
{
u8 val = 0;
@@ -530,14 +523,14 @@ static u8 lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift,
*hc06_ptr += 2;
val = 2; /* 16-bits */
raw_dump_inline(NULL, "Compressed ipv6 addr is (16 bits)",
- *hc06_ptr - 2, 2);
+ *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);
+ *hc06_ptr - 8, 8);
}
return rol8(val, shift);
@@ -601,8 +594,8 @@ static void compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
}
int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
- unsigned short type, const void *_daddr,
- const void *_saddr, unsigned int len)
+ unsigned short type, const void *_daddr,
+ const void *_saddr, unsigned int len)
{
u8 tmp, iphc0, iphc1, *hc06_ptr;
struct ipv6hdr *hdr;
@@ -616,14 +609,13 @@ int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
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);
+ 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));
+ skb_network_header(skb), sizeof(struct ipv6hdr));
- /*
- * As we copy some bit-length fields, in the IPHC encoding bytes,
+ /* 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
@@ -639,11 +631,10 @@ int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
(unsigned char *)_daddr, IEEE802154_ADDR_LEN);
raw_dump_table(__func__,
- "sending raw skb network uncompressed packet",
- skb->data, skb->len);
+ "sending raw skb network uncompressed packet",
+ skb->data, skb->len);
- /*
- * Traffic class, flow label
+ /* 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
@@ -654,11 +645,11 @@ int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
- (hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 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)) {
+ ((hdr->flow_lbl[0] & 0xF0) == 0)) {
/* compress (elide) all */
iphc0 |= LOWPAN_IPHC_TC_C;
} else {
@@ -669,7 +660,7 @@ int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
} else {
/* Flow label cannot be compressed */
if ((hdr->priority == 0) &&
- ((hdr->flow_lbl[0] & 0xF0) == 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);
@@ -695,8 +686,7 @@ int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
hc06_ptr += 1;
}
- /*
- * Hop limit
+ /* Hop limit
* if 1: compress, encoding is 01
* if 64: compress, encoding is 10
* if 255: compress, encoding is 11
@@ -793,7 +783,7 @@ int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
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);
+ skb->data, skb->len);
return 0;
}
EXPORT_SYMBOL_GPL(lowpan_header_compress);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.