From 60c07d258a7369557655625bfed813bcb29b30be Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= <thomas@t-8ch.de>
Date: Tue, 26 Sep 2017 17:45:51 +0000
Subject: [PATCH] clean up magic constants

---
 src/arp.c          |  5 +++--
 src/arp.h          |  3 ---
 src/routemgr.h     |  2 ++
 src/wifistations.c | 17 +++++------------
 4 files changed, 10 insertions(+), 17 deletions(-)

diff --git a/src/arp.c b/src/arp.c
index 9a2dd05..42982e0 100644
--- a/src/arp.c
+++ b/src/arp.c
@@ -6,6 +6,7 @@
 #include <linux/netlink.h>
 #include <linux/if_packet.h>
 #include <linux/if_ether.h>
+#include <linux/if_arp.h>
 
 void arp_handle_in(arp_ctx *ctx, int fd) {
 	struct msghdr msghdr;
@@ -36,7 +37,7 @@ void arp_handle_in(arp_ctx *ctx, int fd) {
 	if (rc == -1)
 		return;
 
-	if (packet.op != htons(ARP_REPLY))
+	if (packet.op != htons(ARPOP_REPLY))
 		return;
 
 	uint8_t *mac = lladdr.sll_addr;
@@ -58,7 +59,7 @@ void arp_send_request(arp_ctx *ctx, const struct in6_addr *addr) {
 		.pr = htons(0x800),
 		.hdl = 6,
 		.prl = 4,
-		.op = htons(ARP_REQUEST)
+		.op = htons(ARPOP_REQUEST)
 	};
 
 	memcpy(&packet.sha, ctx->mac, 6);
diff --git a/src/arp.h b/src/arp.h
index 866fdb5..95be207 100644
--- a/src/arp.h
+++ b/src/arp.h
@@ -5,9 +5,6 @@
 #include <netinet/in.h>
 #include <linux/rtnetlink.h>
 
-#define ARP_REQUEST 1
-#define ARP_REPLY 2
-
 struct __attribute__((packed)) arp_packet {
 	uint16_t hd;
 	uint16_t pr;
diff --git a/src/routemgr.h b/src/routemgr.h
index f2a801b..565d28b 100644
--- a/src/routemgr.h
+++ b/src/routemgr.h
@@ -12,7 +12,9 @@
         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
 #endif
 
+#ifndef RTA_ALIGNTO
 #define RTA_ALIGNTO     4
+#endif
 #define RTA_ALIGN(len) ( ((len)+RTA_ALIGNTO-1) & ~(RTA_ALIGNTO-1) )
 #define RTA_LENGTH(len) (RTA_ALIGN(sizeof(struct rtattr)) + (len))
 #define RTA_DATA(rta)   ((void*)(((char*)(rta)) + RTA_LENGTH(0)))
diff --git a/src/wifistations.c b/src/wifistations.c
index 69e0cf9..5e88397 100644
--- a/src/wifistations.c
+++ b/src/wifistations.c
@@ -20,14 +20,7 @@
 #include <netlink/msg.h>
 #include <netlink/attr.h>
 
-#define NL80211_CMD_NEW_STATION 19
-#define NL80211_CMD_DEL_STATION 20
-#define NL80211_ATTR_IFINDEX 3
-#define NL80211_ATTR_MAC 6
-
-static int no_seq_check(struct nl_msg *msg, void *arg) {
-	return NL_OK;
-}
+#include <linux/nl80211.h>
 
 void wifistations_handle_in(wifistations_ctx *ctx) {
 	nl_recvmsgs(ctx->nl_sock, ctx->cb);
@@ -79,13 +72,15 @@ void wifistations_init(wifistations_ctx *ctx) {
 		exit_error("Failed to allocate netlink socket.\n");
 
 	nl_socket_set_buffer_size(ctx->nl_sock, 8192, 8192);
+	/* no sequence checking for multicast messages */
+	nl_socket_disable_seq_check(ctx->nl_sock);
 
 	if (genl_connect(ctx->nl_sock)) {
 		fprintf(stderr, "Failed to connect to generic netlink.\n");
 		goto fail;
 	}
 
-	int nl80211_id = genl_ctrl_resolve(ctx->nl_sock, "nl80211");
+	int nl80211_id = genl_ctrl_resolve(ctx->nl_sock, NL80211_GENL_NAME);
 	if (nl80211_id < 0) {
 		fprintf(stderr, "nl80211 not found.\n");
 		/* To resolve issue #29 we do not bail out, but return with an
@@ -98,7 +93,7 @@ void wifistations_init(wifistations_ctx *ctx) {
 	}
 
 	/* MLME multicast group */
-	int mcid = nl_get_multicast_id(ctx->nl_sock, "nl80211", "mlme");
+	int mcid = nl_get_multicast_id(ctx->nl_sock, NL80211_GENL_NAME, NL80211_MULTICAST_GROUP_MLME);
 	if (mcid >= 0) {
 		int ret = nl_socket_add_membership(ctx->nl_sock, mcid);
 		if (ret)
@@ -110,8 +105,6 @@ void wifistations_init(wifistations_ctx *ctx) {
 	if (!ctx->cb)
 		exit_error("failed to allocate netlink callbacks\n");
 
-	/* no sequence checking for multicast messages */
-	nl_cb_set(ctx->cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, no_seq_check, NULL);
 	nl_cb_set(ctx->cb, NL_CB_VALID, NL_CB_CUSTOM, wifistations_handle_event, ctx);
 
 	ctx->fd = nl_socket_get_fd(ctx->nl_sock);