The branch main has been updated by kevans:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=94dddbfd00b9d53d1b6a45a58bc87b323cae6791

commit 94dddbfd00b9d53d1b6a45a58bc87b323cae6791
Author:     Kyle Evans <[email protected]>
AuthorDate: 2021-03-09 10:57:01 +0000
Commit:     Kyle Evans <[email protected]>
CommitDate: 2021-03-09 19:50:41 +0000

    if_wg: export tx_bytes, rx_bytes, and last_handshake
    
    The names are self-explanatory; these are currently only used by the
    wg(8) tool, but they are handy data points to have.
    
    Reviewed by:    grehan
    MFC after:      3 days
    Discussed with: decke
    Differential Revision:  https://reviews.freebsd.org/D29143
---
 sys/dev/if_wg/module/module.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/sys/dev/if_wg/module/module.c b/sys/dev/if_wg/module/module.c
index ad2f17c1e803..4ca1c24b56b9 100644
--- a/sys/dev/if_wg/module/module.c
+++ b/sys/dev/if_wg/module/module.c
@@ -69,11 +69,19 @@ MALLOC_DEFINE(M_WG, "WG", "wireguard");
 
 TASKQGROUP_DECLARE(if_io_tqg);
 
+struct wg_timespec64 {
+       uint64_t        tv_sec;
+       uint64_t        tv_nsec;
+};
+
 struct wg_peer_export {
        struct sockaddr_storage         endpoint;
+       struct timespec                 last_handshake;
        uint8_t                         public_key[WG_KEY_SIZE];
        size_t                          endpoint_sz;
        struct wg_allowedip             *aip;
+       uint64_t                        rx_bytes;
+       uint64_t                        tx_bytes;
        int                             aip_count;
        uint16_t                        persistent_keepalive;
 };
@@ -419,6 +427,9 @@ wg_peer_to_export(struct wg_peer *peer, struct 
wg_peer_export *exp)
 
        exp->persistent_keepalive =
            peer->p_timers.t_persistent_keepalive_interval;
+       wg_timers_get_last_handshake(&peer->p_timers, &exp->last_handshake);
+       exp->rx_bytes = counter_u64_fetch(peer->p_rx_bytes);
+       exp->tx_bytes = counter_u64_fetch(peer->p_tx_bytes);
 
        exp->aip_count = 0;
        CK_LIST_FOREACH(rt, &peer->p_routes, r_entry) {
@@ -449,6 +460,7 @@ wg_peer_to_export(struct wg_peer *peer, struct 
wg_peer_export *exp)
 static nvlist_t *
 wg_peer_export_to_nvl(struct wg_peer_export *exp)
 {
+       struct wg_timespec64 ts64;
        nvlist_t *nvl;
 
        if ((nvl = nvlist_create(0)) == NULL)
@@ -462,10 +474,19 @@ wg_peer_export_to_nvl(struct wg_peer_export *exp)
        nvlist_add_binary(nvl, "allowed-ips", exp->aip,
            exp->aip_count * sizeof(*exp->aip));
 
+       ts64.tv_sec = exp->last_handshake.tv_sec;
+       ts64.tv_nsec = exp->last_handshake.tv_nsec;
+       nvlist_add_binary(nvl, "last_handshake", &ts64, sizeof(ts64));
+
        if (exp->persistent_keepalive != 0)
                nvlist_add_number(nvl, "persistent-keepalive-interval",
                    exp->persistent_keepalive);
 
+       if (exp->rx_bytes != 0)
+               nvlist_add_number(nvl, "rx_bytes", exp->rx_bytes);
+       if (exp->tx_bytes != 0)
+               nvlist_add_number(nvl, "tx_bytes", exp->tx_bytes);
+
        return (nvl);
 }
 
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