Separating skb delivery from decompression ensures that we can support further
decompression schemes and removes the mixed return value of error codes with
NET_RX_FOO.
Signed-off-by: Martin Townsend <mtownsend1973@xxxxxxxxx>
---
include/net/6lowpan.h | 4 +---
net/6lowpan/iphc.c | 32 ++++++--------------------------
net/bluetooth/6lowpan.c | 14 ++++++++++++--
net/ieee802154/6lowpan_rtnl.c | 25 +++++++++++++------------
4 files changed, 32 insertions(+), 43 deletions(-)
diff --git a/include/net/6lowpan.h b/include/net/6lowpan.h
index d184df1..abfa359 100644
--- a/include/net/6lowpan.h
+++ b/include/net/6lowpan.h
@@ -372,12 +372,10 @@ lowpan_uncompress_size(const struct sk_buff *skb, u16 *dgram_offset)
return skb->len + uncomp_header - ret;
}
-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);
+ u8 iphc0, u8 iphc1);
int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
unsigned short type, const void *_daddr,
const void *_saddr, unsigned int len);
diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
index 747b3cc..45714fe 100644
--- a/net/6lowpan/iphc.c
+++ b/net/6lowpan/iphc.c
@@ -171,29 +171,6 @@ static int uncompress_context_based_src_addr(struct sk_buff *skb,
return 0;
}
-static int skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr,
- struct net_device *dev, skb_delivery_cb deliver_skb)
-{
- int stat;
-
- skb_push(skb, sizeof(struct ipv6hdr));
- skb_reset_network_header(skb);
- skb_copy_to_linear_data(skb, hdr, sizeof(struct ipv6hdr));
-
- skb->protocol = htons(ETH_P_IPV6);
- skb->pkt_type = PACKET_HOST;
- skb->dev = dev;
-
- raw_dump_table(__func__, "raw skb data dump before receiving",
- skb->data, skb->len);
-
- stat = deliver_skb(skb, dev);
-
- consume_skb(skb);
-
- return stat;
-}
-
/* Uncompress function for multicast destination address,
* when M bit is set.
*/
@@ -327,7 +304,7 @@ 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)
+ u8 iphc0, u8 iphc1)
{
struct ipv6hdr hdr = {};
u8 tmp, num_context = 0;
@@ -492,10 +469,13 @@ 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));
+ skb_push(skb, sizeof(hdr));
+ skb_reset_network_header(skb);
+ skb_copy_to_linear_data(skb, &hdr, sizeof(hdr));
- return skb_deliver(skb, &hdr, dev, deliver_skb);
+ raw_dump_table(__func__, "raw header dump", (u8 *)&hdr, sizeof(hdr));
+ return 0;
drop:
kfree_skb(skb);
return -EINVAL;
diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index 6c5c2ef..45d9a9f 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -252,7 +252,7 @@ static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
skb_cp = skb_copy(skb, GFP_ATOMIC);
if (!skb_cp)
- return -ENOMEM;
+ return NET_RX_DROP;
return netif_rx(skb_cp);
}
@@ -290,7 +290,7 @@ static int process_data(struct sk_buff *skb, struct net_device *netdev,
return lowpan_process_data(skb, netdev,
saddr, IEEE802154_ADDR_LONG, EUI64_ADDR_LEN,
daddr, IEEE802154_ADDR_LONG, EUI64_ADDR_LEN,
- iphc0, iphc1, give_skb_to_upper);
+ iphc0, iphc1);
drop:
kfree_skb(skb);
@@ -350,6 +350,16 @@ static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
if (ret != NET_RX_SUCCESS)
goto drop;
+ local_skb->protocol = htons(ETH_P_IPV6);
+ local_skb->pkt_type = PACKET_HOST;
+ local_skb->dev = dev;
+
+ if (give_skb_to_upper(local_skb, dev)
+ != NET_RX_SUCCESS) {
+ kfree_skb(local_skb);
+ goto drop;
+ }
+
dev->stats.rx_bytes += skb->len;
dev->stats.rx_packets++;
diff --git a/net/ieee802154/6lowpan_rtnl.c b/net/ieee802154/6lowpan_rtnl.c
index 0c1a49b..1cdb8e4 100644
--- a/net/ieee802154/6lowpan_rtnl.c
+++ b/net/ieee802154/6lowpan_rtnl.c
@@ -146,15 +146,20 @@ static int lowpan_give_skb_to_devices(struct sk_buff *skb,
if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) {
skb_cp = skb_copy(skb, GFP_ATOMIC);
if (!skb_cp) {
- stat = -ENOMEM;
- break;
+ kfree_skb(skb);
+ rcu_read_unlock();
+ return NET_RX_DROP;
}
skb_cp->dev = entry->ldev;
stat = netif_rx(skb_cp);
+ if (stat == NET_RX_DROP)
+ break;
}
rcu_read_unlock();
+ consume_skb(skb);
+
return stat;
}
@@ -190,8 +195,7 @@ static int process_data(struct sk_buff *skb, const struct ieee802154_hdr *hdr)
return lowpan_process_data(skb, skb->dev, sap, sa.addr_type,
IEEE802154_ADDR_LEN, dap, da.addr_type,
- IEEE802154_ADDR_LEN, iphc0, iphc1,
- lowpan_give_skb_to_devices);
+ IEEE802154_ADDR_LEN, iphc0, iphc1);
drop:
kfree_skb(skb);
@@ -528,15 +532,8 @@ static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
/* check that it's our buffer */
if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
- skb->protocol = htons(ETH_P_IPV6);
- skb->pkt_type = PACKET_HOST;
-
/* Pull off the 1-byte of 6lowpan header. */
skb_pull(skb, 1);
-
- ret = lowpan_give_skb_to_devices(skb, NULL);
- if (ret == NET_RX_DROP)
- goto drop;
} else {
switch (skb->data[0] & 0xe0) {
case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
@@ -565,7 +562,11 @@ static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
}
}
- return NET_RX_SUCCESS;
+ /* Pass IPv6 packet up to the next layer */
+ skb->protocol = htons(ETH_P_IPV6);
+ skb->pkt_type = PACKET_HOST;
+ return lowpan_give_skb_to_devices(skb, NULL);
+
drop_skb:
kfree_skb(skb);
drop:
--
1.9.1
--
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