compat: Remove skbuff header helper backports.

These have existed largely since v2.6.22, so it's well overdue.

Signed-off-by: Joe Stringer <joe@ovn.org>
Acked-by: Jesse Gross <jesse@kernel.org>

acinclude.m4

@@ -477,10 +477,6 @@ AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
                   [skb_reset_tail_pointer])
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
-  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
-                  [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
-  OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
-                  [OVS_DEFINE([HAVE_ICMP6_HDR])])
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])

datapath/linux/Modules.mk

@@ -37,15 +37,11 @@ openvswitch_headers += \
 	linux/compat/include/linux/err.h \
 	linux/compat/include/linux/etherdevice.h \
 	linux/compat/include/linux/flex_array.h \
-	linux/compat/include/linux/icmp.h \
-	linux/compat/include/linux/icmpv6.h \
 	linux/compat/include/linux/if.h \
-	linux/compat/include/linux/if_arp.h \
 	linux/compat/include/linux/if_ether.h \
 	linux/compat/include/linux/if_link.h \
 	linux/compat/include/linux/if_vlan.h \
 	linux/compat/include/linux/in.h \
-	linux/compat/include/linux/ip.h \
 	linux/compat/include/linux/ipv6.h \
 	linux/compat/include/linux/jiffies.h \
 	linux/compat/include/linux/kconfig.h \
@@ -65,13 +61,10 @@ openvswitch_headers += \
 	linux/compat/include/linux/rcupdate.h \
 	linux/compat/include/linux/reciprocal_div.h \
 	linux/compat/include/linux/rtnetlink.h \
-	linux/compat/include/linux/sctp.h \
 	linux/compat/include/linux/skbuff.h \
 	linux/compat/include/linux/stddef.h \
-	linux/compat/include/linux/tcp.h \
 	linux/compat/include/linux/types.h \
 	linux/compat/include/linux/u64_stats_sync.h \
-	linux/compat/include/linux/udp.h \
 	linux/compat/include/linux/workqueue.h \
 	linux/compat/include/net/checksum.h \
 	linux/compat/include/net/dst.h \

datapath/linux/compat/include/linux/ipv6.h

@@ -6,13 +6,6 @@
 struct frag_queue;
 struct inet_frags;
 
-#ifndef HAVE_SKBUFF_HEADER_HELPERS
-static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
-{
-	return (struct ipv6hdr *)skb_network_header(skb);
-}
-#endif
-
 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,17,0)
 void rpl_ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
 			       struct inet_frags *frags);

datapath/linux/compat/include/linux/skbuff.h

@@ -111,71 +111,6 @@ static inline struct rtable *skb_rtable(const struct sk_buff *skb)
 #define CHECKSUM_COMPLETE CHECKSUM_HW
 #endif
 
-#ifndef HAVE_SKBUFF_HEADER_HELPERS
-static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
-{
-	return skb->h.raw;
-}
-
-static inline void skb_reset_transport_header(struct sk_buff *skb)
-{
-	skb->h.raw = skb->data;
-}
-
-static inline void skb_set_transport_header(struct sk_buff *skb,
-			const int offset)
-{
-	skb->h.raw = skb->data + offset;
-}
-
-static inline unsigned char *skb_network_header(const struct sk_buff *skb)
-{
-	return skb->nh.raw;
-}
-
-static inline void skb_reset_network_header(struct sk_buff *skb)
-{
-	skb->nh.raw = skb->data;
-}
-
-static inline void skb_set_network_header(struct sk_buff *skb, const int offset)
-{
-	skb->nh.raw = skb->data + offset;
-}
-
-static inline unsigned char *skb_mac_header(const struct sk_buff *skb)
-{
-	return skb->mac.raw;
-}
-
-static inline void skb_reset_mac_header(struct sk_buff *skb)
-{
-	skb->mac_header = skb->data;
-}
-
-static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)
-{
-	skb->mac.raw = skb->data + offset;
-}
-
-static inline int skb_transport_offset(const struct sk_buff *skb)
-{
-	return skb_transport_header(skb) - skb->data;
-}
-
-static inline int skb_network_offset(const struct sk_buff *skb)
-{
-	return skb_network_header(skb) - skb->data;
-}
-
-static inline void skb_copy_to_linear_data(struct sk_buff *skb,
-					   const void *from,
-					   const unsigned int len)
-{
-	memcpy(skb->data, from, len);
-}
-#endif	/* !HAVE_SKBUFF_HEADER_HELPERS */
-
 #ifndef HAVE_SKB_WARN_LRO
 #ifndef NETIF_F_LRO
 static inline bool skb_warn_if_lro(const struct sk_buff *skb)