Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking changes from David Miller:

 1) GRE now works over ipv6, from Dmitry Kozlov.

 2) Make SCTP more network namespace aware, from Eric Biederman.

 3) TEAM driver now works with non-ethernet devices, from Jiri Pirko.

 4) Make openvswitch network namespace aware, from Pravin B Shelar.

 5) IPV6 NAT implementation, from Patrick McHardy.

 6) Server side support for TCP Fast Open, from Jerry Chu and others.

 7) Packet BPF filter supports MOD and XOR, from Eric Dumazet and Daniel
    Borkmann.

 8) Increate the loopback default MTU to 64K, from Eric Dumazet.

 9) Use a per-task rather than per-socket page fragment allocator for
    outgoing networking traffic.  This benefits processes that have very
    many mostly idle sockets, which is quite common.

    From Eric Dumazet.

10) Use up to 32K for page fragment allocations, with fallbacks to
    smaller sizes when higher order page allocations fail.  Benefits are
    a) less segments for driver to process b) less calls to page
    allocator c) less waste of space.

    From Eric Dumazet.

11) Allow GRO to be used on GRE tunnels, from Eric Dumazet.

12) VXLAN device driver, one way to handle VLAN issues such as the
    limitation of 4096 VLAN IDs yet still have some level of isolation.
    From Stephen Hemminger.

13) As usual there is a large boatload of driver changes, with the scale
    perhaps tilted towards the wireless side this time around.

Fix up various fairly trivial conflicts, mostly caused by the user
namespace changes.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1012 commits)
  hyperv: Add buffer for extended info after the RNDIS response message.
  hyperv: Report actual status in receive completion packet
  hyperv: Remove extra allocated space for recv_pkt_list elements
  hyperv: Fix page buffer handling in rndis_filter_send_request()
  hyperv: Fix the missing return value in rndis_filter_set_packet_filter()
  hyperv: Fix the max_xfer_size in RNDIS initialization
  vxlan: put UDP socket in correct namespace
  vxlan: Depend on CONFIG_INET
  sfc: Fix the reported priorities of different filter types
  sfc: Remove EFX_FILTER_FLAG_RX_OVERRIDE_IP
  sfc: Fix loopback self-test with separate_tx_channels=1
  sfc: Fix MCDI structure field lookup
  sfc: Add parentheses around use of bitfield macro arguments
  sfc: Fix null function pointer in efx_sriov_channel_type
  vxlan: virtual extensible lan
  igmp: export symbol ip_mc_leave_group
  netlink: add attributes to fdb interface
  tg3: unconditionally select HWMON support when tg3 is enabled.
  Revert "net: ti cpsw ethernet: allow reading phy interface mode from DT"
  gre: fix sparse warning
  ...

1 files changed, 75 insertions, 15 deletions

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 9a0021d16d91..6feeccd83dd7 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -98,11 +98,21 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo);
                                  * 15 is ~13-30min depending on RTO.
                                  */
 
-#define TCP_SYN_RETRIES  5      /* number of times to retry active opening a
-                                 * connection: ~180sec is RFC minimum   */
+#define TCP_SYN_RETRIES  6      /* This is how many retries are done
+                                 * when active opening a connection.
+                                 * RFC1122 says the minimum retry MUST
+                                 * be at least 180secs.  Nevertheless
+                                 * this value is corresponding to
+                                 * 63secs of retransmission with the
+                                 * current initial RTO.
+                                 */
 
-#define TCP_SYNACK_RETRIES 5    /* number of times to retry passive opening a
-                                 * connection: ~180sec is RFC minimum   */
+#define TCP_SYNACK_RETRIES 5    /* This is how may retries are done
+                                 * when passive opening a connection.
+                                 * This is corresponding to 31secs of
+                                 * retransmission with the current
+                                 * initial RTO.
+                                 */
 
 #define TCP_TIMEWAIT_LEN (60*HZ) /* how long to wait to destroy TIME-WAIT
                                   * state, about 60 seconds     */
@@ -214,8 +224,24 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo);
 
 /* Bit Flags for sysctl_tcp_fastopen */
 #define TFO_CLIENT_ENABLE       1
+#define TFO_SERVER_ENABLE       2
 #define TFO_CLIENT_NO_COOKIE    4       /* Data in SYN w/o cookie option */
 
+/* Process SYN data but skip cookie validation */
+#define TFO_SERVER_COOKIE_NOT_CHKED     0x100
+/* Accept SYN data w/o any cookie option */
+#define TFO_SERVER_COOKIE_NOT_REQD      0x200
+
+/* Force enable TFO on all listeners, i.e., not requiring the
+ * TCP_FASTOPEN socket option. SOCKOPT1/2 determine how to set max_qlen.
+ */
+#define TFO_SERVER_WO_SOCKOPT1  0x400
+#define TFO_SERVER_WO_SOCKOPT2  0x800
+/* Always create TFO child sockets on a TFO listener even when
+ * cookie/data not present. (For testing purpose!)
+ */
+#define TFO_SERVER_ALWAYS       0x1000
+
 extern struct inet_timewait_death_row tcp_death_row;
 
 /* sysctl variables for tcp */
@@ -398,7 +424,8 @@ extern enum tcp_tw_status tcp_timewait_state_process(struct inet_timewait_sock *
                                                      const struct tcphdr *th);
 extern struct sock * tcp_check_req(struct sock *sk,struct sk_buff *skb,
                                    struct request_sock *req,
-                                   struct request_sock **prev);
+                                   struct request_sock **prev,
+                                   bool fastopen);
 extern int tcp_child_process(struct sock *parent, struct sock *child,
                              struct sk_buff *skb);
 extern bool tcp_use_frto(struct sock *sk);
@@ -411,12 +438,6 @@ extern void tcp_metrics_init(void);
 extern bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst, bool paws_check);
 extern bool tcp_remember_stamp(struct sock *sk);
 extern bool tcp_tw_remember_stamp(struct inet_timewait_sock *tw);
-extern void tcp_fastopen_cache_get(struct sock *sk, u16 *mss,
-                                   struct tcp_fastopen_cookie *cookie,
-                                   int *syn_loss, unsigned long *last_syn_loss);
-extern void tcp_fastopen_cache_set(struct sock *sk, u16 mss,
-                                   struct tcp_fastopen_cookie *cookie,
-                                   bool syn_lost);
 extern void tcp_fetch_timewait_stamp(struct sock *sk, struct dst_entry *dst);
 extern void tcp_disable_fack(struct tcp_sock *tp);
 extern void tcp_close(struct sock *sk, long timeout);
@@ -458,7 +479,8 @@ extern int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
 extern int tcp_connect(struct sock *sk);
 extern struct sk_buff * tcp_make_synack(struct sock *sk, struct dst_entry *dst,
                                         struct request_sock *req,
-                                        struct request_values *rvp);
+                                        struct request_values *rvp,
+                                        struct tcp_fastopen_cookie *foc);
 extern int tcp_disconnect(struct sock *sk, int flags);
 
 void tcp_connect_init(struct sock *sk);
@@ -527,6 +549,7 @@ extern void tcp_send_delayed_ack(struct sock *sk);
 extern void tcp_cwnd_application_limited(struct sock *sk);
 extern void tcp_resume_early_retransmit(struct sock *sk);
 extern void tcp_rearm_rto(struct sock *sk);
+extern void tcp_reset(struct sock *sk);
 
 /* tcp_timer.c */
 extern void tcp_init_xmit_timers(struct sock *);
@@ -576,6 +599,7 @@ extern int tcp_mtu_to_mss(struct sock *sk, int pmtu);
 extern int tcp_mss_to_mtu(struct sock *sk, int mss);
 extern void tcp_mtup_init(struct sock *sk);
 extern void tcp_valid_rtt_meas(struct sock *sk, u32 seq_rtt);
+extern void tcp_init_buffer_space(struct sock *sk);
 
 static inline void tcp_bound_rto(const struct sock *sk)
 {
@@ -889,15 +913,21 @@ static inline bool tcp_in_initial_slowstart(const struct tcp_sock *tp)
         return tp->snd_ssthresh >= TCP_INFINITE_SSTHRESH;
 }
 
+static inline bool tcp_in_cwnd_reduction(const struct sock *sk)
+{
+        return (TCPF_CA_CWR | TCPF_CA_Recovery) &
+               (1 << inet_csk(sk)->icsk_ca_state);
+}
+
 /* If cwnd > ssthresh, we may raise ssthresh to be half-way to cwnd.
- * The exception is rate halving phase, when cwnd is decreasing towards
+ * The exception is cwnd reduction phase, when cwnd is decreasing towards
  * ssthresh.
  */
 static inline __u32 tcp_current_ssthresh(const struct sock *sk)
 {
         const struct tcp_sock *tp = tcp_sk(sk);
 
-        if ((1 << inet_csk(sk)->icsk_ca_state) & (TCPF_CA_CWR | TCPF_CA_Recovery))
+        if (tcp_in_cwnd_reduction(sk))
                 return tp->snd_ssthresh;
         else
                 return max(tp->snd_ssthresh,
@@ -1094,6 +1124,8 @@ static inline void tcp_openreq_init(struct request_sock *req,
         req->rcv_wnd = 0;               /* So that tcp_send_synack() knows! */
         req->cookie_ts = 0;
         tcp_rsk(req)->rcv_isn = TCP_SKB_CB(skb)->seq;
+        tcp_rsk(req)->rcv_nxt = TCP_SKB_CB(skb)->seq + 1;
+        tcp_rsk(req)->snt_synack = 0;
         req->mss = rx_opt->mss_clamp;
         req->ts_recent = rx_opt->saw_tstamp ? rx_opt->rcv_tsval : 0;
         ireq->tstamp_ok = rx_opt->tstamp_ok;
@@ -1106,6 +1138,15 @@ static inline void tcp_openreq_init(struct request_sock *req,
         ireq->loc_port = tcp_hdr(skb)->dest;
 }
 
+/* Compute time elapsed between SYNACK and the ACK completing 3WHS */
+static inline void tcp_synack_rtt_meas(struct sock *sk,
+                                       struct request_sock *req)
+{
+        if (tcp_rsk(req)->snt_synack)
+                tcp_valid_rtt_meas(sk,
+                    tcp_time_stamp - tcp_rsk(req)->snt_synack);
+}
+
 extern void tcp_enter_memory_pressure(struct sock *sk);
 
 static inline int keepalive_intvl_when(const struct tcp_sock *tp)
@@ -1298,15 +1339,34 @@ extern int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *, const struct sk_buff
 extern int tcp_md5_hash_key(struct tcp_md5sig_pool *hp,
                             const struct tcp_md5sig_key *key);
 
+/* From tcp_fastopen.c */
+extern void tcp_fastopen_cache_get(struct sock *sk, u16 *mss,
+                                   struct tcp_fastopen_cookie *cookie,
+                                   int *syn_loss, unsigned long *last_syn_loss);
+extern void tcp_fastopen_cache_set(struct sock *sk, u16 mss,
+                                   struct tcp_fastopen_cookie *cookie,
+                                   bool syn_lost);
 struct tcp_fastopen_request {
         /* Fast Open cookie. Size 0 means a cookie request */
         struct tcp_fastopen_cookie      cookie;
         struct msghdr                   *data;  /* data in MSG_FASTOPEN */
         u16                             copied; /* queued in tcp_connect() */
 };
-
 void tcp_free_fastopen_req(struct tcp_sock *tp);
 
+extern struct tcp_fastopen_context __rcu *tcp_fastopen_ctx;
+int tcp_fastopen_reset_cipher(void *key, unsigned int len);
+void tcp_fastopen_cookie_gen(__be32 addr, struct tcp_fastopen_cookie *foc);
+
+#define TCP_FASTOPEN_KEY_LENGTH 16
+
+/* Fastopen key context */
+struct tcp_fastopen_context {
+        struct crypto_cipher __rcu      *tfm;
+        __u8                            key[TCP_FASTOPEN_KEY_LENGTH];
+        struct rcu_head                 rcu;
+};
+
 /* write queue abstraction */
 static inline void tcp_write_queue_purge(struct sock *sk)
 {