Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ipv4 / datagram.c

diff --git a/kernel/net/ipv4/datagram.c b/kernel/net/ipv4/datagram.c
new file mode 100644 (file)
index 0000000..90c0e83
--- /dev/null
+++ b/kernel/net/ipv4/datagram.c
@@ -0,0 +1,123 @@
+/*
+ *     common UDP/RAW code
+ *     Linux INET implementation
+ *
+ * Authors:
+ *     Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
+ *
+ *     This program is free software; you can redistribute it and/or
+ *     modify it under the terms of the GNU General Public License
+ *     as published by the Free Software Foundation; either version
+ *     2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/ip.h>
+#include <linux/in.h>
+#include <net/ip.h>
+#include <net/sock.h>
+#include <net/route.h>
+#include <net/tcp_states.h>
+
+int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+       struct inet_sock *inet = inet_sk(sk);
+       struct sockaddr_in *usin = (struct sockaddr_in *) uaddr;
+       struct flowi4 *fl4;
+       struct rtable *rt;
+       __be32 saddr;
+       int oif;
+       int err;
+
+
+       if (addr_len < sizeof(*usin))
+               return -EINVAL;
+
+       if (usin->sin_family != AF_INET)
+               return -EAFNOSUPPORT;
+
+       sk_dst_reset(sk);
+
+       lock_sock(sk);
+
+       oif = sk->sk_bound_dev_if;
+       saddr = inet->inet_saddr;
+       if (ipv4_is_multicast(usin->sin_addr.s_addr)) {
+               if (!oif)
+                       oif = inet->mc_index;
+               if (!saddr)
+                       saddr = inet->mc_addr;
+       }
+       fl4 = &inet->cork.fl.u.ip4;
+       rt = ip_route_connect(fl4, usin->sin_addr.s_addr, saddr,
+                             RT_CONN_FLAGS(sk), oif,
+                             sk->sk_protocol,
+                             inet->inet_sport, usin->sin_port, sk);
+       if (IS_ERR(rt)) {
+               err = PTR_ERR(rt);
+               if (err == -ENETUNREACH)
+                       IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
+               goto out;
+       }
+
+       if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) {
+               ip_rt_put(rt);
+               err = -EACCES;
+               goto out;
+       }
+       if (!inet->inet_saddr)
+               inet->inet_saddr = fl4->saddr;  /* Update source address */
+       if (!inet->inet_rcv_saddr) {
+               inet->inet_rcv_saddr = fl4->saddr;
+               if (sk->sk_prot->rehash)
+                       sk->sk_prot->rehash(sk);
+       }
+       inet->inet_daddr = fl4->daddr;
+       inet->inet_dport = usin->sin_port;
+       sk->sk_state = TCP_ESTABLISHED;
+       inet_set_txhash(sk);
+       inet->inet_id = jiffies;
+
+       sk_dst_set(sk, &rt->dst);
+       err = 0;
+out:
+       release_sock(sk);
+       return err;
+}
+EXPORT_SYMBOL(ip4_datagram_connect);
+
+/* Because UDP xmit path can manipulate sk_dst_cache without holding
+ * socket lock, we need to use sk_dst_set() here,
+ * even if we own the socket lock.
+ */
+void ip4_datagram_release_cb(struct sock *sk)
+{
+       const struct inet_sock *inet = inet_sk(sk);
+       const struct ip_options_rcu *inet_opt;
+       __be32 daddr = inet->inet_daddr;
+       struct dst_entry *dst;
+       struct flowi4 fl4;
+       struct rtable *rt;
+
+       rcu_read_lock();
+
+       dst = __sk_dst_get(sk);
+       if (!dst || !dst->obsolete || dst->ops->check(dst, 0)) {
+               rcu_read_unlock();
+               return;
+       }
+       inet_opt = rcu_dereference(inet->inet_opt);
+       if (inet_opt && inet_opt->opt.srr)
+               daddr = inet_opt->opt.faddr;
+       rt = ip_route_output_ports(sock_net(sk), &fl4, sk, daddr,
+                                  inet->inet_saddr, inet->inet_dport,
+                                  inet->inet_sport, sk->sk_protocol,
+                                  RT_CONN_FLAGS(sk), sk->sk_bound_dev_if);
+
+       dst = !IS_ERR(rt) ? &rt->dst : NULL;
+       sk_dst_set(sk, dst);
+
+       rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(ip4_datagram_release_cb);