pf: fix incorrect anchor_call to userspace

777a4702c changed how we copy out the anchor_call string, and
incorrectly limited it to 8 (4 on 32-bit systems) bytes. Fix that so we
get the full anchor path, rather than just the first few characters.

PR:		279225
Sponsored by:	Rubicon Communications, LLC ("Netgate")

sys/net/pfvar.h

@@ -2474,7 +2474,7 @@ void			 pf_init_keth(struct pf_keth_ruleset *);
 int			 pf_kanchor_setup(struct pf_krule *,
 			    const struct pf_kruleset *, const char *);
 int			 pf_kanchor_copyout(const struct pf_kruleset *,
-			    const struct pf_krule *, char *);
+			    const struct pf_krule *, char *, size_t);
 int			 pf_kanchor_nvcopyout(const struct pf_kruleset *,
 			    const struct pf_krule *, nvlist_t *);
 void			 pf_kanchor_remove(struct pf_krule *);

sys/netpfil/pf/pf_nl.c

@@ -982,7 +982,7 @@ pf_handle_getrule(struct nlmsghdr *hdr, struct nl_pstate *npt)
 	nlattr_add_u64(nw, PF_RT_STATES_TOTAL, counter_u64_fetch(rule->states_tot));
 	nlattr_add_u64(nw, PF_RT_SRC_NODES, counter_u64_fetch(rule->src_nodes));
 
-	error = pf_kanchor_copyout(ruleset, rule, anchor_call);
+	error = pf_kanchor_copyout(ruleset, rule, anchor_call, sizeof(anchor_call));
 	MPASS(error == 0);
 
 	nlattr_add_string(nw, PF_RT_ANCHOR_CALL, anchor_call);

sys/netpfil/pf/pf_ruleset.c

@@ -368,16 +368,16 @@ pf_kanchor_setup(struct pf_krule *r, const struct pf_kruleset *s,
 
 int
 pf_kanchor_copyout(const struct pf_kruleset *rs, const struct pf_krule *r,
-    char *anchor_call)
+    char *anchor_call, size_t anchor_call_len)
 {
 	anchor_call[0] = 0;
 
 	if (r->anchor == NULL)
 		goto done;
 	if (!r->anchor_relative) {
-		strlcpy(anchor_call, "/", sizeof(anchor_call));
+		strlcpy(anchor_call, "/", anchor_call_len);
 		strlcat(anchor_call, r->anchor->path,
-		    sizeof(anchor_call));
+		    anchor_call_len);
 	} else {
 		char	 a[MAXPATHLEN];
 		char	*p;
@@ -391,7 +391,7 @@ pf_kanchor_copyout(const struct pf_kruleset *rs, const struct pf_krule *r,
 				p = a;
 			*p = 0;
 			strlcat(anchor_call, "../",
-			    sizeof(anchor_call));
+			    anchor_call_len);
 		}
 		if (strncmp(a, r->anchor->path, strlen(a))) {
 			printf("pf_anchor_copyout: '%s' '%s'\n", a,
@@ -400,12 +400,12 @@ pf_kanchor_copyout(const struct pf_kruleset *rs, const struct pf_krule *r,
 		}
 		if (strlen(r->anchor->path) > strlen(a))
 			strlcat(anchor_call, r->anchor->path + (a[0] ?
-			    strlen(a) + 1 : 0), sizeof(anchor_call));
+			    strlen(a) + 1 : 0), anchor_call_len);
 
 	}
 	if (r->anchor_wildcard)
 		strlcat(anchor_call, anchor_call[0] ? "/*" : "*",
-		    sizeof(anchor_call));
+		    anchor_call_len);
 
 done:
 
@@ -419,7 +419,7 @@ pf_kanchor_nvcopyout(const struct pf_kruleset *rs, const struct pf_krule *r,
 	char anchor_call[MAXPATHLEN] = { 0 };
 	int ret;
 
-	ret = pf_kanchor_copyout(rs, r, anchor_call);
+	ret = pf_kanchor_copyout(rs, r, anchor_call, sizeof(anchor_call));
 	MPASS(ret == 0);
 
 	nvlist_add_string(nvl, "anchor_call", anchor_call);