Linux-libre 4.8.2-gnupck-4.8.2-gnu

1 files changed, 51 insertions, 19 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index f39b37180..0f665cb26 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -37,6 +37,7 @@
 #include <net/flow_dissector.h>
 #include <linux/splice.h>
 #include <linux/in6.h>
+#include <linux/if_packet.h>
 #include <net/flow.h>
 
 /* The interface for checksum offload between the stack and networking drivers
@@ -301,6 +302,11 @@ struct sk_buff;
 #endif
 extern int sysctl_max_skb_frags;
 
+/* Set skb_shinfo(skb)->gso_size to this in case you want skb_segment to
+ * segment using its current segmentation instead.
+ */
+#define GSO_BY_FRAGS	0xFFFF
+
 typedef struct skb_frag_struct skb_frag_t;
 
 struct skb_frag_struct {
@@ -482,6 +488,8 @@ enum {
 	SKB_GSO_PARTIAL = 1 << 13,
 
 	SKB_GSO_TUNNEL_REMCSUM = 1 << 14,
+
+	SKB_GSO_SCTP = 1 << 15,
 };
 
 #if BITS_PER_LONG > 32
@@ -874,6 +882,15 @@ static inline struct rtable *skb_rtable(const struct sk_buff *skb)
 	return (struct rtable *)skb_dst(skb);
 }
 
+/* For mangling skb->pkt_type from user space side from applications
+ * such as nft, tc, etc, we only allow a conservative subset of
+ * possible pkt_types to be set.
+*/
+static inline bool skb_pkt_type_ok(u32 ptype)
+{
+	return ptype <= PACKET_OTHERHOST;
+}
+
 void kfree_skb(struct sk_buff *skb);
 void kfree_skb_list(struct sk_buff *segs);
 void skb_tx_error(struct sk_buff *skb);
@@ -2830,6 +2847,18 @@ static inline int skb_linearize_cow(struct sk_buff *skb)
 	       __skb_linearize(skb) : 0;
 }
 
+static __always_inline void
+__skb_postpull_rcsum(struct sk_buff *skb, const void *start, unsigned int len,
+		     unsigned int off)
+{
+	if (skb->ip_summed == CHECKSUM_COMPLETE)
+		skb->csum = csum_block_sub(skb->csum,
+					   csum_partial(start, len, 0), off);
+	else if (skb->ip_summed == CHECKSUM_PARTIAL &&
+		 skb_checksum_start_offset(skb) < 0)
+		skb->ip_summed = CHECKSUM_NONE;
+}
+
 /**
  *	skb_postpull_rcsum - update checksum for received skb after pull
  *	@skb: buffer to update
@@ -2840,36 +2869,38 @@ static inline int skb_linearize_cow(struct sk_buff *skb)
  *	update the CHECKSUM_COMPLETE checksum, or set ip_summed to
  *	CHECKSUM_NONE so that it can be recomputed from scratch.
  */
-
 static inline void skb_postpull_rcsum(struct sk_buff *skb,
 				      const void *start, unsigned int len)
 {
-	if (skb->ip_summed == CHECKSUM_COMPLETE)
-		skb->csum = csum_sub(skb->csum, csum_partial(start, len, 0));
-	else if (skb->ip_summed == CHECKSUM_PARTIAL &&
-		 skb_checksum_start_offset(skb) < 0)
-		skb->ip_summed = CHECKSUM_NONE;
+	__skb_postpull_rcsum(skb, start, len, 0);
 }
 
-unsigned char *skb_pull_rcsum(struct sk_buff *skb, unsigned int len);
+static __always_inline void
+__skb_postpush_rcsum(struct sk_buff *skb, const void *start, unsigned int len,
+		     unsigned int off)
+{
+	if (skb->ip_summed == CHECKSUM_COMPLETE)
+		skb->csum = csum_block_add(skb->csum,
+					   csum_partial(start, len, 0), off);
+}
 
+/**
+ *	skb_postpush_rcsum - update checksum for received skb after push
+ *	@skb: buffer to update
+ *	@start: start of data after push
+ *	@len: length of data pushed
+ *
+ *	After doing a push on a received packet, you need to call this to
+ *	update the CHECKSUM_COMPLETE checksum.
+ */
 static inline void skb_postpush_rcsum(struct sk_buff *skb,
 				      const void *start, unsigned int len)
 {
-	/* For performing the reverse operation to skb_postpull_rcsum(),
-	 * we can instead of ...
-	 *
-	 *   skb->csum = csum_add(skb->csum, csum_partial(start, len, 0));
-	 *
-	 * ... just use this equivalent version here to save a few
-	 * instructions. Feeding csum of 0 in csum_partial() and later
-	 * on adding skb->csum is equivalent to feed skb->csum in the
-	 * first place.
-	 */
-	if (skb->ip_summed == CHECKSUM_COMPLETE)
-		skb->csum = csum_partial(start, len, skb->csum);
+	__skb_postpush_rcsum(skb, start, len, 0);
 }
 
+unsigned char *skb_pull_rcsum(struct sk_buff *skb, unsigned int len);
+
 /**
  *	skb_push_rcsum - push skb and update receive checksum
  *	@skb: buffer to update
@@ -3007,6 +3038,7 @@ void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len);
 int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen);
 void skb_scrub_packet(struct sk_buff *skb, bool xnet);
 unsigned int skb_gso_transport_seglen(const struct sk_buff *skb);
+bool skb_gso_validate_mtu(const struct sk_buff *skb, unsigned int mtu);
 struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features);
 struct sk_buff *skb_vlan_untag(struct sk_buff *skb);
 int skb_ensure_writable(struct sk_buff *skb, int write_len);