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| author | Joonwoo Park <joonwpark81@gmail.com> | 2008-04-01 06:02:47 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-04-01 06:02:47 +0200 |
| commit | f83f1768f833cb45bc93429fdc552252a4f55ac3 (patch) | |
| tree | 15de7d2df2fc3a35e0a6b933bb37aefcba2cc3ef /net/llc/llc_sap.c | |
| parent | [IP] UDP: Use SEQ_START_TOKEN. (diff) | |
| download | linux-f83f1768f833cb45bc93429fdc552252a4f55ac3.tar.xz linux-f83f1768f833cb45bc93429fdc552252a4f55ac3.zip | |
[LLC]: skb allocation size for responses
Allocate the skb for llc responses with the received packet size by
using the size adjustable llc_frame_alloc.
Don't allocate useless extra payload.
Cleanup magic numbers.
So, this fixes oops.
Reported by Jim Westfall:
kernel: skb_over_panic: text:c0541fc7 len:1000 put:997 head:c166ac00 data:c166ac2f tail:0xc166b017 end:0xc166ac80 dev:eth0
kernel: ------------[ cut here ]------------
kernel: kernel BUG at net/core/skbuff.c:95!
Signed-off-by: Joonwoo Park <joonwpark81@gmail.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/llc/llc_sap.c')
| -rw-r--r-- | net/llc/llc_sap.c | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c index 2525165e2e8f..e2ddde755019 100644 --- a/net/llc/llc_sap.c +++ b/net/llc/llc_sap.c @@ -24,20 +24,41 @@ #include <net/tcp_states.h> #include <linux/llc.h> +static int llc_mac_header_len(unsigned short devtype) +{ + switch (devtype) { + case ARPHRD_ETHER: + case ARPHRD_LOOPBACK: + return sizeof(struct ethhdr); +#ifdef CONFIG_TR + case ARPHRD_IEEE802_TR: + return sizeof(struct trh_hdr); +#endif + } + return 0; +} + /** * llc_alloc_frame - allocates sk_buff for frame * @dev: network device this skb will be sent over + * @type: pdu type to allocate + * @data_size: data size to allocate * * Allocates an sk_buff for frame and initializes sk_buff fields. * Returns allocated skb or %NULL when out of memory. */ -struct sk_buff *llc_alloc_frame(struct sock *sk, struct net_device *dev) +struct sk_buff *llc_alloc_frame(struct sock *sk, struct net_device *dev, + u8 type, u32 data_size) { - struct sk_buff *skb = alloc_skb(128, GFP_ATOMIC); + int hlen = type == LLC_PDU_TYPE_U ? 3 : 4; + struct sk_buff *skb; + + hlen += llc_mac_header_len(dev->type); + skb = alloc_skb(hlen + data_size, GFP_ATOMIC); if (skb) { skb_reset_mac_header(skb); - skb_reserve(skb, 50); + skb_reserve(skb, hlen); skb_reset_network_header(skb); skb_reset_transport_header(skb); skb->protocol = htons(ETH_P_802_2); |