This patch removes a workaround for datagram_size calculation while
doing fragmentation on transmit.
Signed-off-by: Alexander Aring <alex.aring@xxxxxxxxx>
---
include/net/6lowpan.h | 113
--------------------------------------------
net/ieee802154/6lowpan/tx.c | 18 ++++---
2 files changed, 11 insertions(+), 120 deletions(-)
diff --git a/include/net/6lowpan.h b/include/net/6lowpan.h
index 3509841..eeae5eb 100644
--- a/include/net/6lowpan.h
+++ b/include/net/6lowpan.h
@@ -299,119 +299,6 @@ static inline void lowpan_push_hc_data(u8
**hc_ptr, const void *data,
*hc_ptr += len;
}
-static inline u8 lowpan_addr_mode_size(const u8 addr_mode)
-{
- static const u8 addr_sizes[] = {
- [LOWPAN_IPHC_ADDR_00] = 16,
- [LOWPAN_IPHC_ADDR_01] = 8,
- [LOWPAN_IPHC_ADDR_02] = 2,
- [LOWPAN_IPHC_ADDR_03] = 0,
- };
- return addr_sizes[addr_mode];
-}
-
-static inline u8 lowpan_next_hdr_size(const u8 h_enc, u16
*uncomp_header)
-{
- u8 ret = 1;
-
- if ((h_enc & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
- *uncomp_header += sizeof(struct udphdr);
-
- switch (h_enc & LOWPAN_NHC_UDP_CS_P_11) {
- case LOWPAN_NHC_UDP_CS_P_00:
- ret += 4;
- break;
- case LOWPAN_NHC_UDP_CS_P_01:
- case LOWPAN_NHC_UDP_CS_P_10:
- ret += 3;
- break;
- case LOWPAN_NHC_UDP_CS_P_11:
- ret++;
- break;
- default:
- break;
- }
-
- if (!(h_enc & LOWPAN_NHC_UDP_CS_C))
- ret += 2;
- }
-
- return ret;
-}
-
-/**
- * lowpan_uncompress_size - returns skb->len size with
uncompressed header
- * @skb: sk_buff with 6lowpan header inside
- * @datagram_offset: optional to get the datagram_offset value
- *
- * Returns the skb->len with uncompressed header
- */
-static inline u16
-lowpan_uncompress_size(const struct sk_buff *skb, u16 *dgram_offset)
-{
- u16 ret = 2, uncomp_header = sizeof(struct ipv6hdr);
- u8 iphc0, iphc1, h_enc;
-
- iphc0 = skb_network_header(skb)[0];
- iphc1 = skb_network_header(skb)[1];
-
- switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
- case 0:
- ret += 4;
- break;
- case 1:
- ret += 3;
- break;
- case 2:
- ret++;
- break;
- default:
- break;
- }
-
- if (!(iphc0 & LOWPAN_IPHC_NH_C))
- ret++;
-
- if (!(iphc0 & 0x03))
- ret++;
-
- ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_SAM) >>
- LOWPAN_IPHC_SAM_BIT);
-
- if (iphc1 & LOWPAN_IPHC_M) {
- switch ((iphc1 & LOWPAN_IPHC_DAM_11) >>
- LOWPAN_IPHC_DAM_BIT) {
- case LOWPAN_IPHC_DAM_00:
- ret += 16;
- break;
- case LOWPAN_IPHC_DAM_01:
- ret += 6;
- break;
- case LOWPAN_IPHC_DAM_10:
- ret += 4;
- break;
- case LOWPAN_IPHC_DAM_11:
- ret++;
- break;
- default:
- break;
- }
- } else {
- ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_DAM_11) >>
- LOWPAN_IPHC_DAM_BIT);
- }
-
- if (iphc0 & LOWPAN_IPHC_NH_C) {
- h_enc = skb_network_header(skb)[ret];
- ret += lowpan_next_hdr_size(h_enc, &uncomp_header);
- }
-
- if (dgram_offset)
- *dgram_offset = uncomp_header;
-
- return skb->len + uncomp_header - ret;
-}
-
void lowpan_netdev_setup(struct net_device *dev, enum
lowpan_lltypes lltype);
int
diff --git a/net/ieee802154/6lowpan/tx.c b/net/ieee802154/6lowpan/tx.c
index 9a2147e..4115335 100644
--- a/net/ieee802154/6lowpan/tx.c
+++ b/net/ieee802154/6lowpan/tx.c
@@ -123,16 +123,14 @@ lowpan_xmit_fragment(struct sk_buff *skb, const
struct ieee802154_hdr *wpan_hdr,
static int
lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *ldev,
- const struct ieee802154_hdr *wpan_hdr)
+ const struct ieee802154_hdr *wpan_hdr, u16 dgram_size,
+ u16 dgram_offset)
{
- u16 dgram_size, dgram_offset;
__be16 frag_tag;
u8 frag_hdr[5];
int frag_cap, frag_len, payload_cap, rc;
int skb_unprocessed, skb_offset;
- dgram_size = lowpan_uncompress_size(skb, &dgram_offset) -
- skb->mac_len;
frag_tag = htons(lowpan_dev_info(ldev)->fragment_tag);
lowpan_dev_info(ldev)->fragment_tag++;
@@ -187,7 +185,8 @@ err:
return rc;
}
-static int lowpan_header(struct sk_buff *skb, struct net_device
*ldev)
+static int lowpan_header(struct sk_buff *skb, struct net_device *ldev,
+ u16 *dgram_size, u16 *dgram_offset)
{
struct wpan_dev *wpan_dev =
lowpan_dev_info(ldev)->wdev->ieee802154_ptr;
struct ieee802154_addr sa, da;
@@ -201,7 +200,10 @@ static int lowpan_header(struct sk_buff *skb,
struct net_device *ldev)
daddr = &info.daddr.u.extended_addr;
saddr = &info.saddr.u.extended_addr;
+ *dgram_size = skb->len;
lowpan_header_compress(skb, ldev, ETH_P_IPV6, daddr, saddr,
skb->len);
+ /* dgram_size = (saved bytes after compression) + lowpan header
size */
+ *dgram_offset = (*dgram_size - skb->len) +
skb_network_header_len(skb);
cb->type = IEEE802154_FC_TYPE_DATA;
@@ -234,6 +236,7 @@ netdev_tx_t lowpan_xmit(struct sk_buff *skb,
struct net_device *ldev)
{
struct ieee802154_hdr wpan_hdr;
int max_single, ret;
+ u16 dgram_size, dgram_offset;
pr_debug("package xmit\n");
@@ -244,7 +247,7 @@ netdev_tx_t lowpan_xmit(struct sk_buff *skb,
struct net_device *ldev)
if (!skb)
return NET_XMIT_DROP;
- ret = lowpan_header(skb, ldev);
+ ret = lowpan_header(skb, ldev, &dgram_size, &dgram_offset);
if (ret < 0) {
kfree_skb(skb);
return NET_XMIT_DROP;
@@ -264,7 +267,8 @@ netdev_tx_t lowpan_xmit(struct sk_buff *skb,
struct net_device *ldev)
netdev_tx_t rc;
pr_debug("frame is too big, fragmentation is needed\n");
- rc = lowpan_xmit_fragmented(skb, ldev, &wpan_hdr);
+ rc = lowpan_xmit_fragmented(skb, ldev, &wpan_hdr, dgram_size,
+ dgram_offset);
return rc < 0 ? NET_XMIT_DROP : rc;
}
