/* Put the 2-byte PPP protocol number on the front,
making sure there is room for the address and control fields. */
- if (skb_headroom(skb) < PPP_HDRLEN) {
- struct sk_buff *ns;
-
- ns = alloc_skb(skb->len + dev->hard_header_len, GFP_ATOMIC);
- if (ns == 0)
- goto outf;
- skb_reserve(ns, dev->hard_header_len);
- skb_copy_bits(skb, 0, skb_put(ns, skb->len), skb->len);
- kfree_skb(skb);
- skb = ns;
- }
+ if (skb_cow_head(skb, PPP_HDRLEN))
+ goto outf;
+
pp = skb_push(skb, 2);
proto = npindex_to_proto[npi];
pp[0] = proto >> 8;
}
/* the decompressor still expects the A/C bytes in the hdr */
len = ppp->rcomp->decompress(ppp->rc_state, skb->data - 2,
- skb->len + 2, ns->data, ppp->mru + PPP_HDRLEN);
+ skb->len + 2, ns->data, obuff_size);
if (len < 0) {
/* Pass the compressed frame to pppd as an
error indication. */