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-rw-r--r--net/ipv6/output_core.c76
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);

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