net-tcp: Fast Open client - sending SYN-data

This patch implements sending SYN-data in tcp_connect(). The data is
from tcp_sendmsg() with flag MSG_FASTOPEN (implemented in a later patch).

The length of the cookie in tcp_fastopen_req, init'd to 0, controls the
type of the SYN. If the cookie is not cached (len==0), the host sends
data-less SYN with Fast Open cookie request option to solicit a cookie
from the remote. If cookie is not available (len > 0), the host sends
a SYN-data with Fast Open cookie option. If cookie length is negative,
  the SYN will not include any Fast Open option (for fall back operations).

To deal with middleboxes that may drop SYN with data or experimental TCP
option, the SYN-data is only sent once. SYN retransmits do not include
data or Fast Open options. The connection will fall back to regular TCP
handshake.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 106 insertions, 9 deletions

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 4849be76ccd6..88693281da4c 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -596,6 +596,7 @@ static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb,
         u8 cookie_size = (!tp->rx_opt.cookie_out_never && cvp != NULL) ?
                          tcp_cookie_size_check(cvp->cookie_desired) :
                          0;
+        struct tcp_fastopen_request *fastopen = tp->fastopen_req;
 
 #ifdef CONFIG_TCP_MD5SIG
         *md5 = tp->af_specific->md5_lookup(sk, sk);
@@ -636,6 +637,16 @@ static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb,
                         remaining -= TCPOLEN_SACKPERM_ALIGNED;
         }
 
+        if (fastopen && fastopen->cookie.len >= 0) {
+                u32 need = TCPOLEN_EXP_FASTOPEN_BASE + fastopen->cookie.len;
+                need = (need + 3) & ~3U;  /* Align to 32 bits */
+                if (remaining >= need) {
+                        opts->options |= OPTION_FAST_OPEN_COOKIE;
+                        opts->fastopen_cookie = &fastopen->cookie;
+                        remaining -= need;
+                        tp->syn_fastopen = 1;
+                }
+        }
         /* Note that timestamps are required by the specification.
          *
          * Odd numbers of bytes are prohibited by the specification, ensuring
@@ -2824,6 +2835,96 @@ void tcp_connect_init(struct sock *sk)
         tcp_clear_retrans(tp);
 }
 
+static void tcp_connect_queue_skb(struct sock *sk, struct sk_buff *skb)
+{
+        struct tcp_sock *tp = tcp_sk(sk);
+        struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
+
+        tcb->end_seq += skb->len;
+        skb_header_release(skb);
+        __tcp_add_write_queue_tail(sk, skb);
+        sk->sk_wmem_queued += skb->truesize;
+        sk_mem_charge(sk, skb->truesize);
+        tp->write_seq = tcb->end_seq;
+        tp->packets_out += tcp_skb_pcount(skb);
+}
+
+/* Build and send a SYN with data and (cached) Fast Open cookie. However,
+ * queue a data-only packet after the regular SYN, such that regular SYNs
+ * are retransmitted on timeouts. Also if the remote SYN-ACK acknowledges
+ * only the SYN sequence, the data are retransmitted in the first ACK.
+ * If cookie is not cached or other error occurs, falls back to send a
+ * regular SYN with Fast Open cookie request option.
+ */
+static int tcp_send_syn_data(struct sock *sk, struct sk_buff *syn)
+{
+        struct tcp_sock *tp = tcp_sk(sk);
+        struct tcp_fastopen_request *fo = tp->fastopen_req;
+        int space, i, err = 0, iovlen = fo->data->msg_iovlen;
+        struct sk_buff *syn_data = NULL, *data;
+
+        tcp_fastopen_cache_get(sk, &tp->rx_opt.mss_clamp, &fo->cookie);
+        if (fo->cookie.len <= 0)
+                goto fallback;
+
+        /* MSS for SYN-data is based on cached MSS and bounded by PMTU and
+         * user-MSS. Reserve maximum option space for middleboxes that add
+         * private TCP options. The cost is reduced data space in SYN :(
+         */
+        if (tp->rx_opt.user_mss && tp->rx_opt.user_mss < tp->rx_opt.mss_clamp)
+                tp->rx_opt.mss_clamp = tp->rx_opt.user_mss;
+        space = tcp_mtu_to_mss(sk, inet_csk(sk)->icsk_pmtu_cookie) -
+                MAX_TCP_OPTION_SPACE;
+
+        syn_data = skb_copy_expand(syn, skb_headroom(syn), space,
+                                   sk->sk_allocation);
+        if (syn_data == NULL)
+                goto fallback;
+
+        for (i = 0; i < iovlen && syn_data->len < space; ++i) {
+                struct iovec *iov = &fo->data->msg_iov[i];
+                unsigned char __user *from = iov->iov_base;
+                int len = iov->iov_len;
+
+                if (syn_data->len + len > space)
+                        len = space - syn_data->len;
+                else if (i + 1 == iovlen)
+                        /* No more data pending in inet_wait_for_connect() */
+                        fo->data = NULL;
+
+                if (skb_add_data(syn_data, from, len))
+                        goto fallback;
+        }
+
+        /* Queue a data-only packet after the regular SYN for retransmission */
+        data = pskb_copy(syn_data, sk->sk_allocation);
+        if (data == NULL)
+                goto fallback;
+        TCP_SKB_CB(data)->seq++;
+        TCP_SKB_CB(data)->tcp_flags &= ~TCPHDR_SYN;
+        TCP_SKB_CB(data)->tcp_flags = (TCPHDR_ACK|TCPHDR_PSH);
+        tcp_connect_queue_skb(sk, data);
+        fo->copied = data->len;
+
+        if (tcp_transmit_skb(sk, syn_data, 0, sk->sk_allocation) == 0) {
+                NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPFASTOPENACTIVE);
+                goto done;
+        }
+        syn_data = NULL;
+
+fallback:
+        /* Send a regular SYN with Fast Open cookie request option */
+        if (fo->cookie.len > 0)
+                fo->cookie.len = 0;
+        err = tcp_transmit_skb(sk, syn, 1, sk->sk_allocation);
+        if (err)
+                tp->syn_fastopen = 0;
+        kfree_skb(syn_data);
+done:
+        fo->cookie.len = -1;  /* Exclude Fast Open option for SYN retries */
+        return err;
+}
+
 /* Build a SYN and send it off. */
 int tcp_connect(struct sock *sk)
 {
@@ -2841,17 +2942,13 @@ int tcp_connect(struct sock *sk)
         skb_reserve(buff, MAX_TCP_HEADER);
 
         tcp_init_nondata_skb(buff, tp->write_seq++, TCPHDR_SYN);
+        tp->retrans_stamp = TCP_SKB_CB(buff)->when = tcp_time_stamp;
+        tcp_connect_queue_skb(sk, buff);
         TCP_ECN_send_syn(sk, buff);
 
-        /* Send it off. */
-        TCP_SKB_CB(buff)->when = tcp_time_stamp;
-        tp->retrans_stamp = TCP_SKB_CB(buff)->when;
-        skb_header_release(buff);
-        __tcp_add_write_queue_tail(sk, buff);
-        sk->sk_wmem_queued += buff->truesize;
-        sk_mem_charge(sk, buff->truesize);
-        tp->packets_out += tcp_skb_pcount(buff);
-        err = tcp_transmit_skb(sk, buff, 1, sk->sk_allocation);
+        /* Send off SYN; include data in Fast Open. */
+        err = tp->fastopen_req ? tcp_send_syn_data(sk, buff) :
+              tcp_transmit_skb(sk, buff, 1, sk->sk_allocation);
         if (err == -ECONNREFUSED)
                 return err;