From db45cd8dbfc05eae3cf1a160116b73d6d7f2cbe3 Mon Sep 17 00:00:00 2001
From: Ravi kumar Veeramally <ravikumar.veeramally@linux.intel.com>
Date: Thu, 26 Feb 2015 15:31:26 +0200
Subject: [PATCH] eapol: Provide utility to open raw socket

Opens a raw socket to filter ETH_P_PAE based packets. Binds to specific
interface index to read/write eapol frames.
---
 src/eapol.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 src/eapol.h |  1 +
 2 files changed, 45 insertions(+)

diff --git a/src/eapol.c b/src/eapol.c
index c7f75b55..e9879cde 100644
--- a/src/eapol.c
+++ b/src/eapol.c
@@ -25,6 +25,13 @@
 #endif
 
 #include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/socket.h>
+#include <linux/if.h>
+#include <linux/if_packet.h>
+#include <linux/if_ether.h>
+#include <arpa/inet.h>
 #include <ell/ell.h>
 
 #include "sha1.h"
@@ -828,6 +835,43 @@ void __eapol_set_protocol_version(enum eapol_protocol_version version)
 	protocol_version = version;
 }
 
+struct l_io *eapol_open_pae(uint32_t index)
+{
+	struct l_io *io;
+	struct sockaddr_ll sll;
+	int fd;
+
+	fd = socket(PF_PACKET, SOCK_RAW | SOCK_CLOEXEC, 0);
+	if (fd < 0) {
+		l_error("Failed to create PAE socket %s (%d)",
+						strerror(errno), errno);
+		return NULL;
+	}
+
+	memset(&sll, 0, sizeof(sll));
+	sll.sll_family = AF_PACKET;
+	sll.sll_protocol = htons(ETH_P_PAE);
+	sll.sll_ifindex = index;
+
+	if (bind(fd, (struct sockaddr *) &sll, sizeof(sll)) < 0) {
+		l_error("Failed to bind PAE socket %s (%d)",
+						strerror(errno), errno);
+		close(fd);
+		return NULL;
+	}
+
+	io = l_io_new(fd);
+	if (!io) {
+		l_error("Failed to create IO handling for PAE socket ");
+		close(fd);
+		return NULL;
+	}
+
+	l_io_set_close_on_destroy(io, true);
+
+	return io;
+}
+
 bool eapol_init()
 {
 	state_machines = l_hashmap_new();
diff --git a/src/eapol.h b/src/eapol.h
index 3ef92871..f4ae0dcc 100644
--- a/src/eapol.h
+++ b/src/eapol.h
@@ -146,6 +146,7 @@ void eapol_sm_set_ap_rsn(struct eapol_sm *sm, const uint8_t *rsn_ie,
 				size_t len);
 void eapol_sm_set_own_rsn(struct eapol_sm *sm, const uint8_t *rsn_ie,
 				size_t len);
+struct l_io *eapol_open_pae(uint32_t index);
 
 void eapol_start(int ifindex, struct eapol_sm *sm);