From 2b0a4ffadb1e46aa6a249900ddabd41f963432c1 Mon Sep 17 00:00:00 2001
From: Kristof Provost <kp@FreeBSD.org>
Date: Thu, 6 Dec 2018 18:58:54 +0000
Subject: [PATCH] pf: add a comment describing why do we call pf_map_addr again
 if port selection process fails

Obtained from:	OpenBSD
---
 sys/netpfil/pf/pf_lb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/netpfil/pf/pf_lb.c b/sys/netpfil/pf/pf_lb.c
index 9c04225cc17..030e7ee7684 100644
--- a/sys/netpfil/pf/pf_lb.c
+++ b/sys/netpfil/pf/pf_lb.c
@@ -293,6 +293,10 @@ pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
 		switch (r->rpool.opts & PF_POOL_TYPEMASK) {
 		case PF_POOL_RANDOM:
 		case PF_POOL_ROUNDROBIN:
+			/*
+			 * pick a different source address since we're out
+			 * of free port choices for the current one.
+			 */
 			if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
 				return (1);
 			break;