shinfo = skb_shinfo(skb);
atomic_set(&shinfo->dataref, 1);
shinfo->nr_frags = 0;
- shinfo->tso_size = 0;
- shinfo->tso_segs = 0;
- shinfo->ufo_size = 0;
+ shinfo->gso_size = 0;
+ shinfo->gso_segs = 0;
+ shinfo->gso_type = 0;
shinfo->ip6_frag_id = 0;
shinfo->frag_list = NULL;
atomic_set(&(skb_shinfo(skb)->dataref), 1);
skb_shinfo(skb)->nr_frags = 0;
- skb_shinfo(skb)->tso_size = 0;
- skb_shinfo(skb)->tso_segs = 0;
+ skb_shinfo(skb)->gso_size = 0;
+ skb_shinfo(skb)->gso_segs = 0;
+ skb_shinfo(skb)->gso_type = 0;
skb_shinfo(skb)->frag_list = NULL;
out:
return skb;
#endif
skb_copy_secmark(new, old);
atomic_set(&new->users, 1);
- skb_shinfo(new)->tso_size = skb_shinfo(old)->tso_size;
- skb_shinfo(new)->tso_segs = skb_shinfo(old)->tso_segs;
+ skb_shinfo(new)->gso_size = skb_shinfo(old)->gso_size;
+ skb_shinfo(new)->gso_segs = skb_shinfo(old)->gso_segs;
+ skb_shinfo(new)->gso_type = skb_shinfo(old)->gso_type;
}
/**
* filled. Used by network drivers which may DMA or transfer data
* beyond the buffer end onto the wire.
*
- * May return NULL in out of memory cases.
+ * May return error in out of memory cases. The skb is freed on error.
*/
-struct sk_buff *skb_pad(struct sk_buff *skb, int pad)
+int skb_pad(struct sk_buff *skb, int pad)
{
- struct sk_buff *nskb;
+ int err;
+ int ntail;
/* If the skbuff is non linear tailroom is always zero.. */
- if (skb_tailroom(skb) >= pad) {
+ if (!skb_cloned(skb) && skb_tailroom(skb) >= pad) {
memset(skb->data+skb->len, 0, pad);
- return skb;
+ return 0;
}
-
- nskb = skb_copy_expand(skb, skb_headroom(skb), skb_tailroom(skb) + pad, GFP_ATOMIC);
+
+ ntail = skb->data_len + pad - (skb->end - skb->tail);
+ if (likely(skb_cloned(skb) || ntail > 0)) {
+ err = pskb_expand_head(skb, 0, ntail, GFP_ATOMIC);
+ if (unlikely(err))
+ goto free_skb;
+ }
+
+ /* FIXME: The use of this function with non-linear skb's really needs
+ * to be audited.
+ */
+ err = skb_linearize(skb);
+ if (unlikely(err))
+ goto free_skb;
+
+ memset(skb->data + skb->len, 0, pad);
+ return 0;
+
+free_skb:
kfree_skb(skb);
- if (nskb)
- memset(nskb->data+nskb->len, 0, pad);
- return nskb;
+ return err;
}
/* Trims skb to length len. It can change skb pointers.
EXPORT_SYMBOL_GPL(skb_pull_rcsum);
+/**
+ * skb_segment - Perform protocol segmentation on skb.
+ * @skb: buffer to segment
+ * @sg: whether scatter-gather can be used for generated segments
+ *
+ * This function performs segmentation on the given skb. It returns
+ * the segment at the given position. It returns NULL if there are
+ * no more segments to generate, or when an error is encountered.
+ */
+struct sk_buff *skb_segment(struct sk_buff *skb, int sg)
+{
+ struct sk_buff *segs = NULL;
+ struct sk_buff *tail = NULL;
+ unsigned int mss = skb_shinfo(skb)->gso_size;
+ unsigned int doffset = skb->data - skb->mac.raw;
+ unsigned int offset = doffset;
+ unsigned int headroom;
+ unsigned int len;
+ int nfrags = skb_shinfo(skb)->nr_frags;
+ int err = -ENOMEM;
+ int i = 0;
+ int pos;
+
+ __skb_push(skb, doffset);
+ headroom = skb_headroom(skb);
+ pos = skb_headlen(skb);
+
+ do {
+ struct sk_buff *nskb;
+ skb_frag_t *frag;
+ int hsize, nsize;
+ int k;
+ int size;
+
+ len = skb->len - offset;
+ if (len > mss)
+ len = mss;
+
+ hsize = skb_headlen(skb) - offset;
+ if (hsize < 0)
+ hsize = 0;
+ nsize = hsize + doffset;
+ if (nsize > len + doffset || !sg)
+ nsize = len + doffset;
+
+ nskb = alloc_skb(nsize + headroom, GFP_ATOMIC);
+ if (unlikely(!nskb))
+ goto err;
+
+ if (segs)
+ tail->next = nskb;
+ else
+ segs = nskb;
+ tail = nskb;
+
+ nskb->dev = skb->dev;
+ nskb->priority = skb->priority;
+ nskb->protocol = skb->protocol;
+ nskb->dst = dst_clone(skb->dst);
+ memcpy(nskb->cb, skb->cb, sizeof(skb->cb));
+ nskb->pkt_type = skb->pkt_type;
+ nskb->mac_len = skb->mac_len;
+
+ skb_reserve(nskb, headroom);
+ nskb->mac.raw = nskb->data;
+ nskb->nh.raw = nskb->data + skb->mac_len;
+ nskb->h.raw = nskb->nh.raw + (skb->h.raw - skb->nh.raw);
+ memcpy(skb_put(nskb, doffset), skb->data, doffset);
+
+ if (!sg) {
+ nskb->csum = skb_copy_and_csum_bits(skb, offset,
+ skb_put(nskb, len),
+ len, 0);
+ continue;
+ }
+
+ frag = skb_shinfo(nskb)->frags;
+ k = 0;
+
+ nskb->ip_summed = CHECKSUM_HW;
+ nskb->csum = skb->csum;
+ memcpy(skb_put(nskb, hsize), skb->data + offset, hsize);
+
+ while (pos < offset + len) {
+ BUG_ON(i >= nfrags);
+
+ *frag = skb_shinfo(skb)->frags[i];
+ get_page(frag->page);
+ size = frag->size;
+
+ if (pos < offset) {
+ frag->page_offset += offset - pos;
+ frag->size -= offset - pos;
+ }
+
+ k++;
+
+ if (pos + size <= offset + len) {
+ i++;
+ pos += size;
+ } else {
+ frag->size -= pos + size - (offset + len);
+ break;
+ }
+
+ frag++;
+ }
+
+ skb_shinfo(nskb)->nr_frags = k;
+ nskb->data_len = len - hsize;
+ nskb->len += nskb->data_len;
+ nskb->truesize += nskb->data_len;
+ } while ((offset += len) < skb->len);
+
+ return segs;
+
+err:
+ while ((skb = segs)) {
+ segs = skb->next;
+ kfree(skb);
+ }
+ return ERR_PTR(err);
+}
+
+EXPORT_SYMBOL_GPL(skb_segment);
+
void __init skb_init(void)
{
skbuff_head_cache = kmem_cache_create("skbuff_head_cache",
projects / linux-2.6 / blobdiff