git: 90499f6efd57 - stable/13 - Support ARP for 802 networks

The branch stable/13 has been updated by emaste:

URL: https://cgit.FreeBSD.org/src/commit/?id=90499f6efd57754563223bce1ec173669f1ce8a1

commit 90499f6efd57754563223bce1ec173669f1ce8a1
Author:     Denny Page <dennypage@me.com>
AuthorDate: 2024-04-13 17:16:08 +0000
Commit:     Ed Maste <emaste@FreeBSD.org>
CommitDate: 2024-04-27 14:47:16 +0000

    Support ARP for 802 networks
    
    This is used by 802.3 Ethernet.  (Also be used by 802.4 Token Bus and
    802.5 Token Ring, but we don't support those.)
    
    This was accidentally removed along with FDDI support in commit
    0437c8e3b198, presumably because comments implied it was used only by
    FDDI or Token Ring.
    
    Fixes: 0437c8e3b198 ("Remove support for FDDI networks.")
    Reviewed-by: emaste
    Signed-off-by: Denny Page <dennypage@me.com>
    Pull-request: https://github.com/freebsd/freebsd-src/pull/1166
    (cherry picked from commit fcdf9a19893b9b5beb7a21407de507f0ae4c500b)
    (cherry picked from commit d776dd5fbd484acdf00f6df55583e9aa53226859)
---
 sys/net/if_arp.h       | 2 +-
 sys/netinet/if_ether.c | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/sys/net/if_arp.h b/sys/net/if_arp.h
index 0319807dbfd2..f201fd67cab4 100644
--- a/sys/net/if_arp.h
+++ b/sys/net/if_arp.h
@@ -47,7 +47,7 @@
 struct	arphdr {
 	u_short	ar_hrd;		/* format of hardware address */
 #define ARPHRD_ETHER 	1	/* ethernet hardware format */
-#define ARPHRD_IEEE802	6	/* token-ring hardware format */
+#define ARPHRD_IEEE802	6	/* 802.2 networks (ethernet/tb/tr) */
 #define ARPHRD_FRELAY 	15	/* frame relay hardware format */
 #define ARPHRD_IEEE1394	24	/* firewire hardware format */
 #define ARPHRD_INFINIBAND 32	/* infiniband hardware format */
diff --git a/sys/netinet/if_ether.c b/sys/netinet/if_ether.c
index cd5055e31533..9c72f9268ae5 100644
--- a/sys/netinet/if_ether.c
+++ b/sys/netinet/if_ether.c
@@ -684,6 +684,10 @@ arpintr(struct mbuf *m)
 		hlen = ETHER_ADDR_LEN; /* RFC 826 */
 		layer = "ethernet";
 		break;
+	case ARPHRD_IEEE802:
+		hlen = ETHER_ADDR_LEN;
+		layer = "ieee802";
+		break;
 	case ARPHRD_INFINIBAND:
 		hlen = 20;	/* RFC 4391, INFINIBAND_ALEN */
 		layer = "infiniband";