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Index: head/sys/netinet/tcp_fastopen.c
===================================================================
--- head/sys/netinet/tcp_fastopen.c
+++ head/sys/netinet/tcp_fastopen.c
@@ -81,6 +81,9 @@
* (RDTUN, default TCP_FASTOPEN_CCACHE_BUCKETS_DEFAULT)
* The number of client cookie cache buckets.
*
+ * net.inet.tcp.fastopen.ccache_list (RO)
+ * Print the client cookie cache.
+ *
* net.inet.tcp.fastopen.client_enable (RW, default 0)
* When zero, no new active (i.e., client) TFO connections can be
* created. On the transition from enabled to disabled, the client
@@ -166,11 +169,14 @@
#include "opt_inet.h"
#include <sys/param.h>
+#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/hash.h>
#include <sys/limits.h>
#include <sys/lock.h>
+#include <sys/proc.h>
#include <sys/rmlock.h>
+#include <sys/sbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
@@ -343,6 +349,12 @@
&sysctl_net_inet_tcp_fastopen_setpsk, "",
"Install a new pre-shared key");
+static int sysctl_net_inet_tcp_fastopen_ccache_list(SYSCTL_HANDLER_ARGS);
+SYSCTL_PROC(_net_inet_tcp_fastopen, OID_AUTO, ccache_list,
+ CTLFLAG_VNET | CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_SKIP, NULL, 0,
+ sysctl_net_inet_tcp_fastopen_ccache_list, "A",
+ "List of all client cookie cache entries");
+
static VNET_DEFINE(struct rmlock, tcp_fastopen_keylock);
#define V_tcp_fastopen_keylock VNET(tcp_fastopen_keylock)
@@ -1133,5 +1145,81 @@
TAILQ_REMOVE(&ccb->ccb_entries, cce, cce_link);
ccb->ccb_num_entries--;
uma_zfree(V_tcp_fastopen_ccache.zone, cce);
+}
+
+static int
+sysctl_net_inet_tcp_fastopen_ccache_list(SYSCTL_HANDLER_ARGS)
+{
+ struct sbuf sb;
+ struct tcp_fastopen_ccache_bucket *ccb;
+ struct tcp_fastopen_ccache_entry *cce;
+ sbintime_t now, duration, limit;
+ const int linesize = 128;
+ int i, error, num_entries;
+ unsigned int j;
+#ifdef INET6
+ char clt_buf[INET6_ADDRSTRLEN], srv_buf[INET6_ADDRSTRLEN];
+#else
+ char clt_buf[INET_ADDRSTRLEN], srv_buf[INET_ADDRSTRLEN];
+#endif
+
+ if (jailed_without_vnet(curthread->td_ucred) != 0)
+ return (EPERM);
+
+ /* Only allow root to read the client cookie cache */
+ if (curthread->td_ucred->cr_uid != 0)
+ return (EPERM);
+
+ num_entries = 0;
+ for (i = 0; i < V_tcp_fastopen_ccache.buckets; i++) {
+ ccb = &V_tcp_fastopen_ccache.base[i];
+ CCB_LOCK(ccb);
+ if (ccb->ccb_num_entries > 0)
+ num_entries += ccb->ccb_num_entries;
+ CCB_UNLOCK(ccb);
+ }
+ sbuf_new(&sb, NULL, linesize * (num_entries + 1), SBUF_INCLUDENUL);
+
+ sbuf_printf(&sb,
+ "\nLocal IP address Remote IP address Port MSS"
+ " Disabled Cookie\n");
+
+ now = getsbinuptime();
+ limit = (sbintime_t)V_tcp_fastopen_path_disable_time << 32;
+ for (i = 0; i < V_tcp_fastopen_ccache.buckets; i++) {
+ ccb = &V_tcp_fastopen_ccache.base[i];
+ CCB_LOCK(ccb);
+ TAILQ_FOREACH(cce, &ccb->ccb_entries, cce_link) {
+ if (cce->disable_time != 0) {
+ duration = now - cce->disable_time;
+ if (limit >= duration)
+ duration = limit - duration;
+ else
+ duration = 0;
+ } else
+ duration = 0;
+ sbuf_printf(&sb,
+ "%-20s %-20s %5u %5u ",
+ inet_ntop(cce->af, &cce->cce_client_ip,
+ clt_buf, sizeof(clt_buf)),
+ inet_ntop(cce->af, &cce->cce_server_ip,
+ srv_buf, sizeof(srv_buf)),
+ ntohs(cce->server_port),
+ cce->server_mss);
+ if (duration > 0)
+ sbuf_printf(&sb, "%7ds ", sbintime_getsec(duration));
+ else
+ sbuf_printf(&sb, "%8s ", "No");
+ for (j = 0; j < cce->cookie_len; j++)
+ sbuf_printf(&sb, "%02x", cce->cookie[j]);
+ sbuf_putc(&sb, '\n');
+ }
+ CCB_UNLOCK(ccb);
+ }
+ error = sbuf_finish(&sb);
+ if (error == 0)
+ error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb));
+ sbuf_delete(&sb);
+ return (error);
}

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