1 files changed, 158 insertions, 159 deletions

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index c4906bbcd60e..5c93435b0347 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -39,6 +39,7 @@
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
+#include <linux/kmemcheck.h>
 #include <linux/mm.h>
 #include <linux/interrupt.h>
 #include <linux/in.h>
@@ -201,6 +202,8 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
 	skb->data = data;
 	skb_reset_tail_pointer(skb);
 	skb->end = skb->tail + size;
+	kmemcheck_annotate_bitfield(skb, flags1);
+	kmemcheck_annotate_bitfield(skb, flags2);
 	/* make sure we initialize shinfo sequentially */
 	shinfo = skb_shinfo(skb);
 	atomic_set(&shinfo->dataref, 1);
@@ -210,13 +213,15 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
 	shinfo->gso_type = 0;
 	shinfo->ip6_frag_id = 0;
 	shinfo->tx_flags.flags = 0;
-	shinfo->frag_list = NULL;
+	skb_frag_list_init(skb);
 	memset(&shinfo->hwtstamps, 0, sizeof(shinfo->hwtstamps));
 
 	if (fclone) {
 		struct sk_buff *child = skb + 1;
 		atomic_t *fclone_ref = (atomic_t *) (child + 1);
 
+		kmemcheck_annotate_bitfield(child, flags1);
+		kmemcheck_annotate_bitfield(child, flags2);
 		skb->fclone = SKB_FCLONE_ORIG;
 		atomic_set(fclone_ref, 1);
 
@@ -323,7 +328,7 @@ static void skb_clone_fraglist(struct sk_buff *skb)
 {
 	struct sk_buff *list;
 
-	for (list = skb_shinfo(skb)->frag_list; list; list = list->next)
+	skb_walk_frags(skb, list)
 		skb_get(list);
 }
 
@@ -338,7 +343,7 @@ static void skb_release_data(struct sk_buff *skb)
 				put_page(skb_shinfo(skb)->frags[i].page);
 		}
 
-		if (skb_shinfo(skb)->frag_list)
+		if (skb_has_frags(skb))
 			skb_drop_fraglist(skb);
 
 		kfree(skb->head);
@@ -381,7 +386,7 @@ static void kfree_skbmem(struct sk_buff *skb)
 
 static void skb_release_head_state(struct sk_buff *skb)
 {
-	dst_release(skb->dst);
+	skb_dst_drop(skb);
 #ifdef CONFIG_XFRM
 	secpath_put(skb->sp);
 #endif
@@ -503,7 +508,7 @@ int skb_recycle_check(struct sk_buff *skb, int skb_size)
 	shinfo->gso_type = 0;
 	shinfo->ip6_frag_id = 0;
 	shinfo->tx_flags.flags = 0;
-	shinfo->frag_list = NULL;
+	skb_frag_list_init(skb);
 	memset(&shinfo->hwtstamps, 0, sizeof(shinfo->hwtstamps));
 
 	memset(skb, 0, offsetof(struct sk_buff, tail));
@@ -521,13 +526,12 @@ static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
 	new->transport_header	= old->transport_header;
 	new->network_header	= old->network_header;
 	new->mac_header		= old->mac_header;
-	new->dst		= dst_clone(old->dst);
+	skb_dst_set(new, dst_clone(skb_dst(old)));
 #ifdef CONFIG_XFRM
 	new->sp			= secpath_get(old->sp);
 #endif
 	memcpy(new->cb, old->cb, sizeof(old->cb));
-	new->csum_start		= old->csum_start;
-	new->csum_offset	= old->csum_offset;
+	new->csum		= old->csum;
 	new->local_df		= old->local_df;
 	new->pkt_type		= old->pkt_type;
 	new->ip_summed		= old->ip_summed;
@@ -538,6 +542,7 @@ static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
 #endif
 	new->protocol		= old->protocol;
 	new->mark		= old->mark;
+	new->iif		= old->iif;
 	__nf_copy(new, old);
 #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
     defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
@@ -550,10 +555,17 @@ static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
 #endif
 #endif
 	new->vlan_tci		= old->vlan_tci;
+#if defined(CONFIG_MAC80211) || defined(CONFIG_MAC80211_MODULE)
+	new->do_not_encrypt	= old->do_not_encrypt;
+#endif
 
 	skb_copy_secmark(new, old);
 }
 
+/*
+ * You should not add any new code to this function.  Add it to
+ * __copy_skb_header above instead.
+ */
 static struct sk_buff *__skb_clone(struct sk_buff *n, struct sk_buff *skb)
 {
 #define C(x) n->x = skb->x
@@ -569,16 +581,11 @@ static struct sk_buff *__skb_clone(struct sk_buff *n, struct sk_buff *skb)
 	n->cloned = 1;
 	n->nohdr = 0;
 	n->destructor = NULL;
-	C(iif);
 	C(tail);
 	C(end);
 	C(head);
 	C(data);
 	C(truesize);
-#if defined(CONFIG_MAC80211) || defined(CONFIG_MAC80211_MODULE)
-	C(do_not_encrypt);
-	C(requeue);
-#endif
 	atomic_set(&n->users, 1);
 
 	atomic_inc(&(skb_shinfo(skb)->dataref));
@@ -633,6 +640,9 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
 		n = kmem_cache_alloc(skbuff_head_cache, gfp_mask);
 		if (!n)
 			return NULL;
+
+		kmemcheck_annotate_bitfield(n, flags1);
+		kmemcheck_annotate_bitfield(n, flags2);
 		n->fclone = SKB_FCLONE_UNAVAILABLE;
 	}
 
@@ -755,7 +765,7 @@ struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask)
 		skb_shinfo(n)->nr_frags = i;
 	}
 
-	if (skb_shinfo(skb)->frag_list) {
+	if (skb_has_frags(skb)) {
 		skb_shinfo(n)->frag_list = skb_shinfo(skb)->frag_list;
 		skb_clone_fraglist(n);
 	}
@@ -818,7 +828,7 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
 	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
 		get_page(skb_shinfo(skb)->frags[i].page);
 
-	if (skb_shinfo(skb)->frag_list)
+	if (skb_has_frags(skb))
 		skb_clone_fraglist(skb);
 
 	skb_release_data(skb);
@@ -1090,7 +1100,7 @@ drop_pages:
 		for (; i < nfrags; i++)
 			put_page(skb_shinfo(skb)->frags[i].page);
 
-		if (skb_shinfo(skb)->frag_list)
+		if (skb_has_frags(skb))
 			skb_drop_fraglist(skb);
 		goto done;
 	}
@@ -1185,7 +1195,7 @@ unsigned char *__pskb_pull_tail(struct sk_buff *skb, int delta)
 	/* Optimization: no fragments, no reasons to preestimate
 	 * size of pulled pages. Superb.
 	 */
-	if (!skb_shinfo(skb)->frag_list)
+	if (!skb_has_frags(skb))
 		goto pull_pages;
 
 	/* Estimate size of pulled pages. */
@@ -1282,8 +1292,9 @@ EXPORT_SYMBOL(__pskb_pull_tail);
 
 int skb_copy_bits(const struct sk_buff *skb, int offset, void *to, int len)
 {
-	int i, copy;
 	int start = skb_headlen(skb);
+	struct sk_buff *frag_iter;
+	int i, copy;
 
 	if (offset > (int)skb->len - len)
 		goto fault;
@@ -1325,28 +1336,23 @@ int skb_copy_bits(const struct sk_buff *skb, int offset, void *to, int len)
 		start = end;
 	}
 
-	if (skb_shinfo(skb)->frag_list) {
-		struct sk_buff *list = skb_shinfo(skb)->frag_list;
+	skb_walk_frags(skb, frag_iter) {
+		int end;
 
-		for (; list; list = list->next) {
-			int end;
-
-			WARN_ON(start > offset + len);
-
-			end = start + list->len;
-			if ((copy = end - offset) > 0) {
-				if (copy > len)
-					copy = len;
-				if (skb_copy_bits(list, offset - start,
-						  to, copy))
-					goto fault;
-				if ((len -= copy) == 0)
-					return 0;
-				offset += copy;
-				to     += copy;
-			}
-			start = end;
+		WARN_ON(start > offset + len);
+
+		end = start + frag_iter->len;
+		if ((copy = end - offset) > 0) {
+			if (copy > len)
+				copy = len;
+			if (skb_copy_bits(frag_iter, offset - start, to, copy))
+				goto fault;
+			if ((len -= copy) == 0)
+				return 0;
+			offset += copy;
+			to     += copy;
 		}
+		start = end;
 	}
 	if (!len)
 		return 0;
@@ -1531,6 +1537,7 @@ int skb_splice_bits(struct sk_buff *skb, unsigned int offset,
 		.ops = &sock_pipe_buf_ops,
 		.spd_release = sock_spd_release,
 	};
+	struct sk_buff *frag_iter;
 	struct sock *sk = skb->sk;
 
 	/*
@@ -1545,13 +1552,11 @@ int skb_splice_bits(struct sk_buff *skb, unsigned int offset,
 	/*
 	 * now see if we have a frag_list to map
 	 */
-	if (skb_shinfo(skb)->frag_list) {
-		struct sk_buff *list = skb_shinfo(skb)->frag_list;
-
-		for (; list && tlen; list = list->next) {
-			if (__skb_splice_bits(list, &offset, &tlen, &spd, sk))
-				break;
-		}
+	skb_walk_frags(skb, frag_iter) {
+		if (!tlen)
+			break;
+		if (__skb_splice_bits(frag_iter, &offset, &tlen, &spd, sk))
+			break;
 	}
 
 done:
@@ -1590,8 +1595,9 @@ done:
 
 int skb_store_bits(struct sk_buff *skb, int offset, const void *from, int len)
 {
-	int i, copy;
 	int start = skb_headlen(skb);
+	struct sk_buff *frag_iter;
+	int i, copy;
 
 	if (offset > (int)skb->len - len)
 		goto fault;
@@ -1632,28 +1638,24 @@ int skb_store_bits(struct sk_buff *skb, int offset, const void *from, int len)
 		start = end;
 	}
 
-	if (skb_shinfo(skb)->frag_list) {
-		struct sk_buff *list = skb_shinfo(skb)->frag_list;
+	skb_walk_frags(skb, frag_iter) {
+		int end;
 
-		for (; list; list = list->next) {
-			int end;
-
-			WARN_ON(start > offset + len);
-
-			end = start + list->len;
-			if ((copy = end - offset) > 0) {
-				if (copy > len)
-					copy = len;
-				if (skb_store_bits(list, offset - start,
-						   from, copy))
-					goto fault;
-				if ((len -= copy) == 0)
-					return 0;
-				offset += copy;
-				from += copy;
-			}
-			start = end;
+		WARN_ON(start > offset + len);
+
+		end = start + frag_iter->len;
+		if ((copy = end - offset) > 0) {
+			if (copy > len)
+				copy = len;
+			if (skb_store_bits(frag_iter, offset - start,
+					   from, copy))
+				goto fault;
+			if ((len -= copy) == 0)
+				return 0;
+			offset += copy;
+			from += copy;
 		}
+		start = end;
 	}
 	if (!len)
 		return 0;
@@ -1670,6 +1672,7 @@ __wsum skb_checksum(const struct sk_buff *skb, int offset,
 {
 	int start = skb_headlen(skb);
 	int i, copy = start - offset;
+	struct sk_buff *frag_iter;
 	int pos = 0;
 
 	/* Checksum header. */
@@ -1709,29 +1712,25 @@ __wsum skb_checksum(const struct sk_buff *skb, int offset,
 		start = end;
 	}
 
-	if (skb_shinfo(skb)->frag_list) {
-		struct sk_buff *list = skb_shinfo(skb)->frag_list;
+	skb_walk_frags(skb, frag_iter) {
+		int end;
 
-		for (; list; list = list->next) {
-			int end;
-
-			WARN_ON(start > offset + len);
-
-			end = start + list->len;
-			if ((copy = end - offset) > 0) {
-				__wsum csum2;
-				if (copy > len)
-					copy = len;
-				csum2 = skb_checksum(list, offset - start,
-						     copy, 0);
-				csum = csum_block_add(csum, csum2, pos);
-				if ((len -= copy) == 0)
-					return csum;
-				offset += copy;
-				pos    += copy;
-			}
-			start = end;
+		WARN_ON(start > offset + len);
+
+		end = start + frag_iter->len;
+		if ((copy = end - offset) > 0) {
+			__wsum csum2;
+			if (copy > len)
+				copy = len;
+			csum2 = skb_checksum(frag_iter, offset - start,
+					     copy, 0);
+			csum = csum_block_add(csum, csum2, pos);
+			if ((len -= copy) == 0)
+				return csum;
+			offset += copy;
+			pos    += copy;
 		}
+		start = end;
 	}
 	BUG_ON(len);
 
@@ -1746,6 +1745,7 @@ __wsum skb_copy_and_csum_bits(const struct sk_buff *skb, int offset,
 {
 	int start = skb_headlen(skb);
 	int i, copy = start - offset;
+	struct sk_buff *frag_iter;
 	int pos = 0;
 
 	/* Copy header. */
@@ -1790,31 +1790,27 @@ __wsum skb_copy_and_csum_bits(const struct sk_buff *skb, int offset,
 		start = end;
 	}
 
-	if (skb_shinfo(skb)->frag_list) {
-		struct sk_buff *list = skb_shinfo(skb)->frag_list;
+	skb_walk_frags(skb, frag_iter) {
+		__wsum csum2;
+		int end;
 
-		for (; list; list = list->next) {
-			__wsum csum2;
-			int end;
-
-			WARN_ON(start > offset + len);
-
-			end = start + list->len;
-			if ((copy = end - offset) > 0) {
-				if (copy > len)
-					copy = len;
-				csum2 = skb_copy_and_csum_bits(list,
-							       offset - start,
-							       to, copy, 0);
-				csum = csum_block_add(csum, csum2, pos);
-				if ((len -= copy) == 0)
-					return csum;
-				offset += copy;
-				to     += copy;
-				pos    += copy;
-			}
-			start = end;
+		WARN_ON(start > offset + len);
+
+		end = start + frag_iter->len;
+		if ((copy = end - offset) > 0) {
+			if (copy > len)
+				copy = len;
+			csum2 = skb_copy_and_csum_bits(frag_iter,
+						       offset - start,
+						       to, copy, 0);
+			csum = csum_block_add(csum, csum2, pos);
+			if ((len -= copy) == 0)
+				return csum;
+			offset += copy;
+			to     += copy;
+			pos    += copy;
 		}
+		start = end;
 	}
 	BUG_ON(len);
 	return csum;
@@ -2288,7 +2284,7 @@ unsigned int skb_seq_read(unsigned int consumed, const u8 **data,
 next_skb:
 	block_limit = skb_headlen(st->cur_skb) + st->stepped_offset;
 
-	if (abs_offset < block_limit) {
+	if (abs_offset < block_limit && !st->frag_data) {
 		*data = st->cur_skb->data + (abs_offset - st->stepped_offset);
 		return block_limit - abs_offset;
 	}
@@ -2324,8 +2320,7 @@ next_skb:
 		st->frag_data = NULL;
 	}
 
-	if (st->root_skb == st->cur_skb &&
-	    skb_shinfo(st->root_skb)->frag_list) {
+	if (st->root_skb == st->cur_skb && skb_has_frags(st->root_skb)) {
 		st->cur_skb = skb_shinfo(st->root_skb)->frag_list;
 		st->frag_idx = 0;
 		goto next_skb;
@@ -2636,7 +2631,7 @@ struct sk_buff *skb_segment(struct sk_buff *skb, int features)
 			} else
 				skb_get(fskb2);
 
-			BUG_ON(skb_shinfo(nskb)->frag_list);
+			SKB_FRAG_ASSERT(nskb);
 			skb_shinfo(nskb)->frag_list = fskb2;
 		}
 
@@ -2661,30 +2656,40 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
 {
 	struct sk_buff *p = *head;
 	struct sk_buff *nskb;
+	struct skb_shared_info *skbinfo = skb_shinfo(skb);
+	struct skb_shared_info *pinfo = skb_shinfo(p);
 	unsigned int headroom;
 	unsigned int len = skb_gro_len(skb);
+	unsigned int offset = skb_gro_offset(skb);
+	unsigned int headlen = skb_headlen(skb);
 
 	if (p->len + len >= 65536)
 		return -E2BIG;
 
-	if (skb_shinfo(p)->frag_list)
+	if (pinfo->frag_list)
 		goto merge;
-	else if (skb_headlen(skb) <= skb_gro_offset(skb)) {
-		if (skb_shinfo(p)->nr_frags + skb_shinfo(skb)->nr_frags >
-		    MAX_SKB_FRAGS)
+	else if (headlen <= offset) {
+		skb_frag_t *frag;
+		skb_frag_t *frag2;
+		int i = skbinfo->nr_frags;
+		int nr_frags = pinfo->nr_frags + i;
+
+		offset -= headlen;
+
+		if (nr_frags > MAX_SKB_FRAGS)
 			return -E2BIG;
 
-		skb_shinfo(skb)->frags[0].page_offset +=
-			skb_gro_offset(skb) - skb_headlen(skb);
-		skb_shinfo(skb)->frags[0].size -=
-			skb_gro_offset(skb) - skb_headlen(skb);
+		pinfo->nr_frags = nr_frags;
+		skbinfo->nr_frags = 0;
 
-		memcpy(skb_shinfo(p)->frags + skb_shinfo(p)->nr_frags,
-		       skb_shinfo(skb)->frags,
-		       skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
+		frag = pinfo->frags + nr_frags;
+		frag2 = skbinfo->frags + i;
+		do {
+			*--frag = *--frag2;
+		} while (--i);
 
-		skb_shinfo(p)->nr_frags += skb_shinfo(skb)->nr_frags;
-		skb_shinfo(skb)->nr_frags = 0;
+		frag->page_offset += offset;
+		frag->size -= offset;
 
 		skb->truesize -= skb->data_len;
 		skb->len -= skb->data_len;
@@ -2715,7 +2720,7 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
 
 	*NAPI_GRO_CB(nskb) = *NAPI_GRO_CB(p);
 	skb_shinfo(nskb)->frag_list = p;
-	skb_shinfo(nskb)->gso_size = skb_shinfo(p)->gso_size;
+	skb_shinfo(nskb)->gso_size = pinfo->gso_size;
 	skb_header_release(p);
 	nskb->prev = p;
 
@@ -2730,16 +2735,13 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
 	p = nskb;
 
 merge:
-	if (skb_gro_offset(skb) > skb_headlen(skb)) {
-		skb_shinfo(skb)->frags[0].page_offset +=
-			skb_gro_offset(skb) - skb_headlen(skb);
-		skb_shinfo(skb)->frags[0].size -=
-			skb_gro_offset(skb) - skb_headlen(skb);
-		skb_gro_reset_offset(skb);
-		skb_gro_pull(skb, skb_headlen(skb));
+	if (offset > headlen) {
+		skbinfo->frags[0].page_offset += offset - headlen;
+		skbinfo->frags[0].size -= offset - headlen;
+		offset = headlen;
 	}
 
-	__skb_pull(skb, skb_gro_offset(skb));
+	__skb_pull(skb, offset);
 
 	p->prev->next = skb;
 	p->prev = skb;
@@ -2786,6 +2788,7 @@ __skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len)
 {
 	int start = skb_headlen(skb);
 	int i, copy = start - offset;
+	struct sk_buff *frag_iter;
 	int elt = 0;
 
 	if (copy > 0) {
@@ -2819,26 +2822,22 @@ __skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len)
 		start = end;
 	}
 
-	if (skb_shinfo(skb)->frag_list) {
-		struct sk_buff *list = skb_shinfo(skb)->frag_list;
-
-		for (; list; list = list->next) {
-			int end;
+	skb_walk_frags(skb, frag_iter) {
+		int end;
 
-			WARN_ON(start > offset + len);
+		WARN_ON(start > offset + len);
 
-			end = start + list->len;
-			if ((copy = end - offset) > 0) {
-				if (copy > len)
-					copy = len;
-				elt += __skb_to_sgvec(list, sg+elt, offset - start,
-						      copy);
-				if ((len -= copy) == 0)
-					return elt;
-				offset += copy;
-			}
-			start = end;
+		end = start + frag_iter->len;
+		if ((copy = end - offset) > 0) {
+			if (copy > len)
+				copy = len;
+			elt += __skb_to_sgvec(frag_iter, sg+elt, offset - start,
+					      copy);
+			if ((len -= copy) == 0)
+				return elt;
+			offset += copy;
 		}
+		start = end;
 	}
 	BUG_ON(len);
 	return elt;
@@ -2886,7 +2885,7 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
 		return -ENOMEM;
 
 	/* Easy case. Most of packets will go this way. */
-	if (!skb_shinfo(skb)->frag_list) {
+	if (!skb_has_frags(skb)) {
 		/* A little of trouble, not enough of space for trailer.
 		 * This should not happen, when stack is tuned to generate
 		 * good frames. OK, on miss we reallocate and reserve even more
@@ -2921,7 +2920,7 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
 
 		if (skb1->next == NULL && tailbits) {
 			if (skb_shinfo(skb1)->nr_frags ||
-			    skb_shinfo(skb1)->frag_list ||
+			    skb_has_frags(skb1) ||
 			    skb_tailroom(skb1) < tailbits)
 				ntail = tailbits + 128;
 		}
@@ -2930,7 +2929,7 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
 		    skb_cloned(skb1) ||
 		    ntail ||
 		    skb_shinfo(skb1)->nr_frags ||
-		    skb_shinfo(skb1)->frag_list) {
+		    skb_has_frags(skb1)) {
 			struct sk_buff *skb2;
 
 			/* Fuck, we are miserable poor guys... */
@@ -3016,12 +3015,12 @@ EXPORT_SYMBOL_GPL(skb_tstamp_tx);
  */
 bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off)
 {
-	if (unlikely(start > skb->len - 2) ||
-	    unlikely((int)start + off > skb->len - 2)) {
+	if (unlikely(start > skb_headlen(skb)) ||
+	    unlikely((int)start + off > skb_headlen(skb) - 2)) {
 		if (net_ratelimit())
 			printk(KERN_WARNING
 			       "bad partial csum: csum=%u/%u len=%u\n",
-			       start, off, skb->len);
+			       start, off, skb_headlen(skb));
 		return false;
 	}
 	skb->ip_summed = CHECKSUM_PARTIAL;