1 files changed, 76 insertions, 0 deletions
diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c
new file mode 100644
index 000000000000..c2e73e647e44
--- /dev/null
+++ b/net/ipv6/output_core.c
@@ -0,0 +1,76 @@
+/*
+ * IPv6 library code, needed by static components when full IPv6 support is
+ * not configured or static.  These functions are needed by GSO/GRO implementation.
+ */
+#include <linux/export.h>
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+
+void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt)
+{
+	static atomic_t ipv6_fragmentation_id;
+	int old, new;
+
+#if IS_ENABLED(CONFIG_IPV6)
+	if (rt && !(rt->dst.flags & DST_NOPEER)) {
+		struct inet_peer *peer;
+		struct net *net;
+
+		net = dev_net(rt->dst.dev);
+		peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
+		if (peer) {
+			fhdr->identification = htonl(inet_getid(peer, 0));
+			inet_putpeer(peer);
+			return;
+		}
+	}
+#endif
+	do {
+		old = atomic_read(&ipv6_fragmentation_id);
+		new = old + 1;
+		if (!new)
+			new = 1;
+	} while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old);
+	fhdr->identification = htonl(new);
+}
+EXPORT_SYMBOL(ipv6_select_ident);
+
+int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
+{
+	u16 offset = sizeof(struct ipv6hdr);
+	struct ipv6_opt_hdr *exthdr =
+				(struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
+	unsigned int packet_len = skb->tail - skb->network_header;
+	int found_rhdr = 0;
+	*nexthdr = &ipv6_hdr(skb)->nexthdr;
+
+	while (offset + 1 <= packet_len) {
+
+		switch (**nexthdr) {
+
+		case NEXTHDR_HOP:
+			break;
+		case NEXTHDR_ROUTING:
+			found_rhdr = 1;
+			break;
+		case NEXTHDR_DEST:
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+			if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
+				break;
+#endif
+			if (found_rhdr)
+				return offset;
+			break;
+		default :
+			return offset;
+		}
+
+		offset += ipv6_optlen(exthdr);
+		*nexthdr = &exthdr->nexthdr;
+		exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
+						 offset);
+	}
+
+	return offset;
+}
+EXPORT_SYMBOL(ip6_find_1stfragopt);