pf: convert DIOCRGETASTATS to netlink

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

lib/libpfctl/libpfctl.c

@@ -3751,26 +3751,94 @@ pfctl_clear_addrs(struct pfctl_handle *h, const struct pfr_table *filter,
 
 	return (e.error);
 }
+
+struct nl_astats {
+	struct pfr_astats *a;
+	size_t max;
+	size_t count;
+	uint64_t total_count;
+};
+
+#define _OUT(_field)	offsetof(struct pfr_astats, _field)
+static const struct snl_attr_parser ap_pfr_astats[] = {
+	{ .type = PF_AS_ADDR , .off = _OUT(pfras_a), .arg = &pfr_addr_parser, .cb = snl_attr_get_nested },
+	{ .type = PF_AS_PACKETS, .off = _OUT(pfras_packets), .arg = (void *)(PFR_DIR_MAX * PFR_OP_ADDR_MAX), .cb = snl_attr_get_uint64_array },
+	{ .type = PF_AS_BYTES, .off = _OUT(pfras_bytes), .arg = (void *)(PFR_DIR_MAX * PFR_OP_ADDR_MAX), .cb = snl_attr_get_uint64_array },
+	{ .type = PF_AS_TZERO, .off = _OUT(pfras_tzero), .cb = snl_attr_get_time_t },
+};
+#undef _OUT
+SNL_DECLARE_ATTR_PARSER(pfr_astats_parser, ap_pfr_astats);
+
+static bool
+snl_attr_get_pfr_astats(struct snl_state *ss, struct nlattr *nla,
+    const void *arg __unused, void *target)
+{
+	struct nl_astats *a = (struct nl_astats *)target;
+	bool ret;
+
+	if (a->count >= a->max)
+		return (false);
+
+	ret = snl_parse_header(ss, NLA_DATA(nla), NLA_DATA_LEN(nla),
+	    &pfr_astats_parser, &a->a[a->count]);
+	if (ret)
+		a->count++;
+
+	return (ret);
+}
+
+#define _OUT(_field)	offsetof(struct nl_astats, _field)
+static struct snl_attr_parser ap_table_get_astats[] = {
+	{ .type = PF_TAS_ASTATS, .off = 0, .cb = snl_attr_get_pfr_astats },
+	{ .type = PF_TAS_ASTATS_COUNT, .off = _OUT(total_count), .cb = snl_attr_get_uint32 },
+};
+#undef _OUT
+SNL_DECLARE_PARSER(table_astats_parser, struct genlmsghdr, snl_f_p_empty, ap_table_get_astats);
+
 int
 pfctl_get_astats(struct pfctl_handle *h, const struct pfr_table *tbl,
-    struct pfr_astats *addr, int *size, int flags)
+    struct pfr_astats *as, int *size, int flags)
 {
-	struct pfioc_table io;
+	struct snl_writer nw;
+	struct snl_errmsg_data e = {};
+	struct nlmsghdr *hdr;
+	struct nl_astats out = { 0 };
+	uint32_t seq_id;
+	int family_id;
 
 	if (tbl == NULL || size == NULL || *size < 0 ||
-	    (*size && addr == NULL)) {
+	    (*size && as == NULL)) {
 		errno = EINVAL;
 		return (-1);
 	}
-	bzero(&io, sizeof io);
-	io.pfrio_flags = flags;
-	io.pfrio_table = *tbl;
-	io.pfrio_buffer = addr;
-	io.pfrio_esize = sizeof(*addr);
-	io.pfrio_size = *size;
-	if (ioctl(h->fd, DIOCRGETASTATS, &io)) {
-		return (-1);
+
+	family_id = snl_get_genl_family(&h->ss, PFNL_FAMILY_NAME);
+	if (family_id == 0)
+		return (ENOTSUP);
+
+	snl_init_writer(&h->ss, &nw);
+
+	hdr = snl_create_genl_msg_request(&nw, family_id, PFNL_CMD_TABLE_GET_ASTATS);
+
+	snl_add_msg_attr_table(&nw, PF_TAS_TABLE, tbl);
+	snl_add_msg_attr_u32(&nw, PF_TAS_FLAGS, flags);
+
+	if ((hdr = snl_finalize_msg(&nw)) == NULL)
+		return (ENXIO);
+	seq_id = hdr->nlmsg_seq;
+
+	if (! snl_send_message(&h->ss, hdr))
+		return (ENXIO);
+
+	out.a = as;
+	out.max = *size;
+
+	while ((hdr = snl_read_reply_multi(&h->ss, seq_id, &e)) != NULL) {
+		if (! snl_parse_nlmsg(&h->ss, hdr, &table_astats_parser, &out))
+			continue;
 	}
-	*size = io.pfrio_size;
+
+	*size = out.total_count;
+
 	return (0);
 }