Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ipv6 / output_core.c

diff --git a/kernel/net/ipv6/output_core.c b/kernel/net/ipv6/output_core.c
new file mode 100644 (file)
index 0000000..85892af
--- /dev/null
+++ b/kernel/net/ipv6/output_core.c
@@ -0,0 +1,175 @@
+/*
+ * 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/ip.h>
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+#include <net/addrconf.h>
+#include <net/secure_seq.h>
+
+static u32 __ipv6_select_ident(struct net *net, u32 hashrnd,
+                              struct in6_addr *dst, struct in6_addr *src)
+{
+       u32 hash, id;
+
+       hash = __ipv6_addr_jhash(dst, hashrnd);
+       hash = __ipv6_addr_jhash(src, hash);
+       hash ^= net_hash_mix(net);
+
+       /* Treat id of 0 as unset and if we get 0 back from ip_idents_reserve,
+        * set the hight order instead thus minimizing possible future
+        * collisions.
+        */
+       id = ip_idents_reserve(hash, 1);
+       if (unlikely(!id))
+               id = 1 << 31;
+
+       return id;
+}
+
+/* This function exists only for tap drivers that must support broken
+ * clients requesting UFO without specifying an IPv6 fragment ID.
+ *
+ * This is similar to ipv6_select_ident() but we use an independent hash
+ * seed to limit information leakage.
+ *
+ * The network header must be set before calling this.
+ */
+void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb)
+{
+       static u32 ip6_proxy_idents_hashrnd __read_mostly;
+       struct in6_addr buf[2];
+       struct in6_addr *addrs;
+       u32 id;
+
+       addrs = skb_header_pointer(skb,
+                                  skb_network_offset(skb) +
+                                  offsetof(struct ipv6hdr, saddr),
+                                  sizeof(buf), buf);
+       if (!addrs)
+               return;
+
+       net_get_random_once(&ip6_proxy_idents_hashrnd,
+                           sizeof(ip6_proxy_idents_hashrnd));
+
+       id = __ipv6_select_ident(net, ip6_proxy_idents_hashrnd,
+                                &addrs[1], &addrs[0]);
+       skb_shinfo(skb)->ip6_frag_id = htonl(id);
+}
+EXPORT_SYMBOL_GPL(ipv6_proxy_select_ident);
+
+void ipv6_select_ident(struct net *net, struct frag_hdr *fhdr,
+                      struct rt6_info *rt)
+{
+       static u32 ip6_idents_hashrnd __read_mostly;
+       u32 id;
+
+       net_get_random_once(&ip6_idents_hashrnd, sizeof(ip6_idents_hashrnd));
+
+       id = __ipv6_select_ident(net, ip6_idents_hashrnd, &rt->rt6i_dst.addr,
+                                &rt->rt6i_src.addr);
+       fhdr->identification = htonl(id);
+}
+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_pointer(skb) -
+               skb_network_header(skb);
+       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);
+
+#if IS_ENABLED(CONFIG_IPV6)
+int ip6_dst_hoplimit(struct dst_entry *dst)
+{
+       int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
+       if (hoplimit == 0) {
+               struct net_device *dev = dst->dev;
+               struct inet6_dev *idev;
+
+               rcu_read_lock();
+               idev = __in6_dev_get(dev);
+               if (idev)
+                       hoplimit = idev->cnf.hop_limit;
+               else
+                       hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
+               rcu_read_unlock();
+       }
+       return hoplimit;
+}
+EXPORT_SYMBOL(ip6_dst_hoplimit);
+#endif
+
+static int __ip6_local_out_sk(struct sock *sk, struct sk_buff *skb)
+{
+       int len;
+
+       len = skb->len - sizeof(struct ipv6hdr);
+       if (len > IPV6_MAXPLEN)
+               len = 0;
+       ipv6_hdr(skb)->payload_len = htons(len);
+       IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
+
+       return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, sk, skb,
+                      NULL, skb_dst(skb)->dev, dst_output_sk);
+}
+
+int __ip6_local_out(struct sk_buff *skb)
+{
+       return __ip6_local_out_sk(skb->sk, skb);
+}
+EXPORT_SYMBOL_GPL(__ip6_local_out);
+
+int ip6_local_out_sk(struct sock *sk, struct sk_buff *skb)
+{
+       int err;
+
+       err = __ip6_local_out_sk(sk, skb);
+       if (likely(err == 1))
+               err = dst_output_sk(sk, skb);
+
+       return err;
+}
+EXPORT_SYMBOL_GPL(ip6_local_out_sk);
+
+int ip6_local_out(struct sk_buff *skb)
+{
+       return ip6_local_out_sk(skb->sk, skb);
+}
+EXPORT_SYMBOL_GPL(ip6_local_out);