git: 9291d079d54b - main - ipfilter: Print protocol when listing NAT table mappings

The branch main has been updated by cy:

URL: https://cgit.FreeBSD.org/src/commit/?id=9291d079d54b828b43d3714a5f19f0ffe92837b8

commit 9291d079d54b828b43d3714a5f19f0ffe92837b8
Author:     Cy Schubert <cy@FreeBSD.org>
AuthorDate: 2022-02-28 19:43:33 +0000
Commit:     Cy Schubert <cy@FreeBSD.org>
CommitDate: 2022-02-28 20:11:39 +0000

    ipfilter: Print protocol when listing NAT table mappings
    
    NAT table mappings list only the source and destination IP, the source
    and destinaion port numbers, and their mappings. But the protocol is not
    listed. Now that Facebook and Google use QUIC, seeing port 443 in in a
    list of active NAT sessions could mean 443/tcp or 443/udp. This patch
    adds the protocol to the listing to aid in determining whether HTTPS is
    TCP or QUIC in a NAT mapping listing. This also helps differentiatinete
    between other protocols such as ICMP, ESP, and AH in ipnat list of active
    sessions.
    
    MFC after:      1 week
---
 sbin/ipf/libipf/printactivenat.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/sbin/ipf/libipf/printactivenat.c b/sbin/ipf/libipf/printactivenat.c
index fcef19a4efa7..3a6337ab0f7b 100644
--- a/sbin/ipf/libipf/printactivenat.c
+++ b/sbin/ipf/libipf/printactivenat.c
@@ -15,10 +15,17 @@
 static const char rcsid[] = "@(#)$Id$";
 #endif
 
+static int proto_opened = 0;
 
 void
 printactivenat(nat_t *nat, int opts, u_long ticks)
 {
+	struct protoent *pproto;
+
+	if (proto_opened == 0) {
+		proto_opened = 1;
+		setprotoent(1);
+	}
 
 	PRINTF("%s", getnattype(nat));
 
@@ -55,6 +62,9 @@ printactivenat(nat_t *nat, int opts, u_long ticks)
 		if ((nat->nat_flags & IPN_TCPUDP) != 0)
 			PRINTF(" %-5hu", ntohs(nat->nat_ndport));
 
+		pproto = getprotobynumber(nat->nat_pr[0]);
+		PRINTF(" %s", pproto->p_name);
+
 	} else if (nat->nat_dir == NAT_OUTBOUND) {
 		printactiveaddress(nat->nat_v[0], "%-15s", &nat->nat_osrc6,
 				   nat->nat_ifnames[0]);
@@ -76,6 +86,9 @@ printactivenat(nat_t *nat, int opts, u_long ticks)
 		if ((nat->nat_flags & IPN_TCPUDP) != 0)
 			PRINTF(" %hu", ntohs(nat->nat_odport));
 		PRINTF("]");
+
+		pproto = getprotobynumber(nat->nat_pr[1]);
+		PRINTF(" %s", pproto->p_name);
 	} else {
 		printactiveaddress(nat->nat_v[1], "%-15s", &nat->nat_ndst6,
 				   nat->nat_ifnames[0]);
@@ -97,8 +110,12 @@ printactivenat(nat_t *nat, int opts, u_long ticks)
 		if ((nat->nat_flags & IPN_TCPUDP) != 0)
 			PRINTF(" %hu", ntohs(nat->nat_osport));
 		PRINTF("]");
+
+		pproto = getprotobynumber(nat->nat_pr[0]);
+		PRINTF(" %s", pproto->p_name);
 	}
 
+
 	if (opts & OPT_VERBOSE) {
 		PRINTF("\n\tttl %lu use %hu sumd %s/",
 			nat->nat_age - ticks, nat->nat_use,