pf: convert DIOCRGETADDRS to netlink

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

2 files changed, 84 insertions, 0 deletions

diff --git a/lib/libpfctl/libpfctl.c b/lib/libpfctl/libpfctl.c
index 511478de6cac..e747763ae6ef 100644
--- a/lib/libpfctl/libpfctl.c
+++ b/lib/libpfctl/libpfctl.c
@@ -2742,6 +2742,88 @@ int pfctl_table_get_addrs(int dev, struct pfr_table *tbl, struct pfr_addr *addr,
 	return (0);
 }
 
+struct nl_addrs {
+	size_t max;
+	struct pfr_addr	*addrs;
+	size_t count;
+	size_t total_count;
+};
+
+#define _OUT(_field)	offsetof(struct pfr_addr, _field)
+static const struct snl_attr_parser ap_pfr_addr[] = {
+	{ .type = PFR_A_AF, .off = _OUT(pfra_af), .cb = snl_attr_get_uint32 },
+	{ .type = PFR_A_NET, .off = _OUT(pfra_net), .cb = snl_attr_get_uint8 },
+	{ .type = PFR_A_NOT, .off = _OUT(pfra_not), .cb = snl_attr_get_bool },
+	{ .type = PFR_A_ADDR, .off = _OUT(pfra_ip6addr), .cb = snl_attr_get_in6_addr },
+};
+#undef _OUT
+SNL_DECLARE_ATTR_PARSER(pfr_addr_parser, ap_pfr_addr);
+
+static bool
+snl_attr_get_pfr_addrs(struct snl_state *ss, struct nlattr *nla,
+    const void *arg __unused, void *target)
+{
+	struct nl_addrs *a = (struct nl_addrs *)target;
+	bool ret;
+
+	if (a->count >= a->max)
+		return (false);
+
+	ret = snl_parse_header(ss, NLA_DATA(nla), NLA_DATA_LEN(nla),
+	    &pfr_addr_parser, &a->addrs[a->count]);
+	if (ret)
+		a->count++;
+
+	return (ret);
+}
+
+#define _OUT(_field)	offsetof(struct nl_addrs, _field)
+static struct snl_attr_parser ap_table_get_addr[] = {
+	{ .type = PF_TA_ADDR, .off = 0, .cb = snl_attr_get_pfr_addrs },
+	{ .type = PF_TA_ADDR_COUNT, .off = _OUT(total_count), .cb = snl_attr_get_uint32 },
+};
+#undef _OUT
+SNL_DECLARE_PARSER(table_get_addr_parser, struct genlmsghdr, snl_f_p_empty, ap_table_get_addr);
+int
+pfctl_table_get_addrs_h(struct pfctl_handle *h, struct pfr_table *tbl,
+    struct pfr_addr *addr, int *size, int flags)
+{
+	struct nl_addrs addrs = { 0 };
+	struct snl_writer nw;
+	struct snl_errmsg_data e = {};
+	struct nlmsghdr *hdr;
+	uint32_t seq_id;
+	int family_id;
+
+	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_ADDR);
+
+	snl_add_msg_attr_table(&nw, PF_TA_TABLE, tbl);
+	snl_add_msg_attr_u32(&nw, PF_TA_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);
+
+	addrs.addrs = addr;
+	addrs.max = *size;
+	while ((hdr = snl_read_reply_multi(&h->ss, seq_id, &e)) != NULL) {
+		if (! snl_parse_nlmsg(&h->ss, hdr, &table_get_addr_parser, &addrs))
+			continue;
+	}
+
+	*size = addrs.total_count;
+
+	return (e.error);
+}
+
 int
 pfctl_set_statusif(struct pfctl_handle *h, const char *ifname)
 {
diff --git a/lib/libpfctl/libpfctl.h b/lib/libpfctl/libpfctl.h
index ae4b18dabe75..a5b7e1c23bd0 100644
--- a/lib/libpfctl/libpfctl.h
+++ b/lib/libpfctl/libpfctl.h
@@ -529,6 +529,8 @@ int	pfctl_table_set_addrs_h(struct pfctl_handle *h, struct pfr_table *tbl,
 int	pfctl_table_set_addrs(int dev, struct pfr_table *tbl, struct pfr_addr
 	    *addr, int size, int *size2, int *nadd, int *ndel, int *nchange,
 	    int flags);
+int	pfctl_table_get_addrs_h(struct pfctl_handle *h, struct pfr_table *tbl, struct pfr_addr *addr,
+	    int *size, int flags);
 int	pfctl_table_get_addrs(int dev, struct pfr_table *tbl, struct pfr_addr
 	    *addr, int *size, int flags);
 int	pfctl_set_statusif(struct pfctl_handle *h, const char *ifname);