TCPCT part 1e: implement socket option TCP_COOKIE_TRANSACTIONS

Provide per socket control of the TCP cookie option and SYN/SYNACK data.

This is a straightforward re-implementation of an earlier (year-old)
patch that no longer applies cleanly, with permission of the original
author (Adam Langley):

    http://thread.gmane.org/gmane.linux.network/102586

The principle difference is using a TCP option to carry the cookie nonce,
instead of a user configured offset in the data.

Allocations have been rearranged to avoid requiring GFP_ATOMIC.

Requires:
   net: TCP_MSS_DEFAULT, TCP_MSS_DESIRED
   TCPCT part 1c: sysctl_tcp_cookie_size, socket option TCP_COOKIE_TRANSACTIONS
   TCPCT part 1d: define TCP cookie option, extend existing struct's

Signed-off-by: William.Allen.Simpson@gmail.com
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index ba03ac80435a535dde4a9627f617333949d99e98..c8666b70cde0cf4c4109a8459a96ace8692419e3 100644 (file)
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2085,8 +2085,9 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
        int val;
        int err = 0;
 
-       /* This is a string value all the others are int's */
-       if (optname == TCP_CONGESTION) {
+       /* These are data/string values, all the others are ints */
+       switch (optname) {
+       case TCP_CONGESTION: {
                char name[TCP_CA_NAME_MAX];
 
                if (optlen < 1)
@@ -2103,6 +2104,93 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
                release_sock(sk);
                return err;
        }
+       case TCP_COOKIE_TRANSACTIONS: {
+               struct tcp_cookie_transactions ctd;
+               struct tcp_cookie_values *cvp = NULL;
+
+               if (sizeof(ctd) > optlen)
+                       return -EINVAL;
+               if (copy_from_user(&ctd, optval, sizeof(ctd)))
+                       return -EFAULT;
+
+               if (ctd.tcpct_used > sizeof(ctd.tcpct_value) ||
+                   ctd.tcpct_s_data_desired > TCP_MSS_DESIRED)
+                       return -EINVAL;
+
+               if (ctd.tcpct_cookie_desired == 0) {
+                       /* default to global value */
+               } else if ((0x1 & ctd.tcpct_cookie_desired) ||
+                          ctd.tcpct_cookie_desired > TCP_COOKIE_MAX ||
+                          ctd.tcpct_cookie_desired < TCP_COOKIE_MIN) {
+                       return -EINVAL;
+               }
+
+               if (TCP_COOKIE_OUT_NEVER & ctd.tcpct_flags) {
+                       /* Supercedes all other values */
+                       lock_sock(sk);
+                       if (tp->cookie_values != NULL) {
+                               kref_put(&tp->cookie_values->kref,
+                                        tcp_cookie_values_release);
+                               tp->cookie_values = NULL;
+                       }
+                       tp->rx_opt.cookie_in_always = 0; /* false */
+                       tp->rx_opt.cookie_out_never = 1; /* true */
+                       release_sock(sk);
+                       return err;
+               }
+
+               /* Allocate ancillary memory before locking.
+                */
+               if (ctd.tcpct_used > 0 ||
+                   (tp->cookie_values == NULL &&
+                    (sysctl_tcp_cookie_size > 0 ||
+                     ctd.tcpct_cookie_desired > 0 ||
+                     ctd.tcpct_s_data_desired > 0))) {
+                       cvp = kzalloc(sizeof(*cvp) + ctd.tcpct_used,
+                                     GFP_KERNEL);
+                       if (cvp == NULL)
+                               return -ENOMEM;
+               }
+               lock_sock(sk);
+               tp->rx_opt.cookie_in_always =
+                       (TCP_COOKIE_IN_ALWAYS & ctd.tcpct_flags);
+               tp->rx_opt.cookie_out_never = 0; /* false */
+
+               if (tp->cookie_values != NULL) {
+                       if (cvp != NULL) {
+                               /* Changed values are recorded by a changed
+                                * pointer, ensuring the cookie will differ,
+                                * without separately hashing each value later.
+                                */
+                               kref_put(&tp->cookie_values->kref,
+                                        tcp_cookie_values_release);
+                               kref_init(&cvp->kref);
+                               tp->cookie_values = cvp;
+                       } else {
+                               cvp = tp->cookie_values;
+                       }
+               }
+               if (cvp != NULL) {
+                       cvp->cookie_desired = ctd.tcpct_cookie_desired;
+
+                       if (ctd.tcpct_used > 0) {
+                               memcpy(cvp->s_data_payload, ctd.tcpct_value,
+                                      ctd.tcpct_used);
+                               cvp->s_data_desired = ctd.tcpct_used;
+                               cvp->s_data_constant = 1; /* true */
+                       } else {
+                               /* No constant payload data. */
+                               cvp->s_data_desired = ctd.tcpct_s_data_desired;
+                               cvp->s_data_constant = 0; /* false */
+                       }
+               }
+               release_sock(sk);
+               return err;
+       }
+       default:
+               /* fallthru */
+               break;
+       };
 
        if (optlen < sizeof(int))
                return -EINVAL;
@@ -2427,6 +2515,47 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
                if (copy_to_user(optval, icsk->icsk_ca_ops->name, len))
                        return -EFAULT;
                return 0;
+
+       case TCP_COOKIE_TRANSACTIONS: {
+               struct tcp_cookie_transactions ctd;
+               struct tcp_cookie_values *cvp = tp->cookie_values;
+
+               if (get_user(len, optlen))
+                       return -EFAULT;
+               if (len < sizeof(ctd))
+                       return -EINVAL;
+
+               memset(&ctd, 0, sizeof(ctd));
+               ctd.tcpct_flags = (tp->rx_opt.cookie_in_always ?
+                                  TCP_COOKIE_IN_ALWAYS : 0)
+                               | (tp->rx_opt.cookie_out_never ?
+                                  TCP_COOKIE_OUT_NEVER : 0);
+
+               if (cvp != NULL) {
+                       ctd.tcpct_flags |= (cvp->s_data_in ?
+                                           TCP_S_DATA_IN : 0)
+                                        | (cvp->s_data_out ?
+                                           TCP_S_DATA_OUT : 0);
+
+                       ctd.tcpct_cookie_desired = cvp->cookie_desired;
+                       ctd.tcpct_s_data_desired = cvp->s_data_desired;
+
+                       /* Cookie(s) saved, return as nonce */
+                       if (sizeof(ctd.tcpct_value) < cvp->cookie_pair_size) {
+                               /* impossible? */
+                               return -EINVAL;
+                       }
+                       memcpy(&ctd.tcpct_value[0], &cvp->cookie_pair[0],
+                              cvp->cookie_pair_size);
+                       ctd.tcpct_used = cvp->cookie_pair_size;
+               }
+
+               if (put_user(sizeof(ctd), optlen))
+                       return -EFAULT;
+               if (copy_to_user(optval, &ctd, sizeof(ctd)))
+                       return -EFAULT;
+               return 0;
+       }
        default:
                return -ENOPROTOOPT;
        }