Merge branch 'x86-64'

[linux-2.6] / net / core / skbuff.c

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 368d98578c14e51d84935f167f2e84a3bc5bfa32..6edbb90cbcec303605be4064b2f1da0d56e18eb3 100644 (file)
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1739,12 +1739,15 @@ unsigned int skb_find_text(struct sk_buff *skb, unsigned int from,
                           unsigned int to, struct ts_config *config,
                           struct ts_state *state)
 {
+       unsigned int ret;
+
        config->get_next_block = skb_ts_get_next_block;
        config->finish = skb_ts_finish;
 
        skb_prepare_seq_read(skb, from, to, TS_SKB_CB(state));
 
-       return textsearch_find(config, state);
+       ret = textsearch_find(config, state);
+       return (ret <= to - from ? ret : UINT_MAX);
 }
 
 /**
@@ -1842,6 +1845,132 @@ unsigned char *skb_pull_rcsum(struct sk_buff *skb, unsigned int len)
 
 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",