1 files changed, 109 insertions, 0 deletions
diff --git a/roms/ipxe/src/net/icmpv4.c b/roms/ipxe/src/net/icmpv4.c
new file mode 100644
index 00000000..996ba149
--- /dev/null
+++ b/roms/ipxe/src/net/icmpv4.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <string.h>
+#include <errno.h>
+#include <ipxe/iobuf.h>
+#include <ipxe/in.h>
+#include <ipxe/tcpip.h>
+#include <ipxe/icmp.h>
+
+/** @file
+ *
+ * ICMPv4 protocol
+ *
+ */
+
+struct icmp_echo_protocol icmpv4_echo_protocol __icmp_echo_protocol;
+
+/**
+ * Process a received packet
+ *
+ * @v iobuf		I/O buffer
+ * @v netdev		Network device
+ * @v st_src		Partially-filled source address
+ * @v st_dest		Partially-filled destination address
+ * @v pshdr_csum	Pseudo-header checksum
+ * @ret rc		Return status code
+ */
+static int icmpv4_rx ( struct io_buffer *iobuf,
+		       struct net_device *netdev __unused,
+		       struct sockaddr_tcpip *st_src,
+		       struct sockaddr_tcpip *st_dest __unused,
+		       uint16_t pshdr_csum __unused ) {
+	struct icmp_header *icmp = iobuf->data;
+	size_t len = iob_len ( iobuf );
+	unsigned int csum;
+	unsigned int type;
+	int rc;
+
+	/* Sanity check */
+	if ( len < sizeof ( *icmp ) ) {
+		DBG ( "ICMP packet too short at %zd bytes (min %zd bytes)\n",
+		      len, sizeof ( *icmp ) );
+		rc = -EINVAL;
+		goto discard;
+	}
+
+	/* Verify checksum */
+	csum = tcpip_chksum ( icmp, len );
+	if ( csum != 0 ) {
+		DBG ( "ICMP checksum incorrect (is %04x, should be 0000)\n",
+		      csum );
+		DBG_HD ( icmp, len );
+		rc = -EINVAL;
+		goto discard;
+	}
+
+	/* Handle ICMP packet */
+	type = icmp->type;
+	switch ( type ) {
+	case ICMP_ECHO_REQUEST:
+		return icmp_rx_echo_request ( iobuf, st_src,
+					      &icmpv4_echo_protocol );
+	case ICMP_ECHO_REPLY:
+		return icmp_rx_echo_reply ( iobuf, st_src );
+	default:
+		DBG ( "ICMP ignoring type %d\n", type );
+		rc = 0;
+		break;
+	}
+
+ discard:
+	free_iob ( iobuf );
+	return rc;
+}
+
+/** ICMPv4 TCP/IP protocol */
+struct tcpip_protocol icmpv4_protocol __tcpip_protocol = {
+	.name = "ICMPv4",
+	.rx = icmpv4_rx,
+	.tcpip_proto = IP_ICMP,
+};
+
+/** ICMPv4 echo protocol */
+struct icmp_echo_protocol icmpv4_echo_protocol __icmp_echo_protocol = {
+	.family = AF_INET,
+	.request = ICMP_ECHO_REQUEST,
+	.reply = ICMP_ECHO_REPLY,
+	.tcpip_protocol = &icmpv4_protocol,
+	.net_checksum = 0,
+};