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authorVadim Kochan <vadim4j@gmail.com>2016-01-26 22:25:06 +0200
committerTobias Klauser <tklauser@distanz.ch>2016-01-28 16:15:29 +0100
commitfac5a67eb5d4928f7efbf1f0d731a7e93f0f8193 (patch)
tree5c98747f50297c27f81f605715b0d9762d2ac167 /trafgen_l2.c
parentd053535a66ff864d309dec2303927e410b27e5b6 (diff)
trafgen: l2: Add ARP header generation logic
Add ARP protocol header fields generation. By default htype ethernet (1) and ptype IPv4 (0x0800) and the corresponding hlen/plen values will be initialized and the opcode is set to ARP Request (1). Source MAC and IP address are set to the device's addresses if not specified. Signed-off-by: Vadim Kochan <vadim4j@gmail.com> [tk: rephrase and extend commit message] Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Diffstat (limited to 'trafgen_l2.c')
-rw-r--r--trafgen_l2.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/trafgen_l2.c b/trafgen_l2.c
index 1082049..4bbeea1 100644
--- a/trafgen_l2.c
+++ b/trafgen_l2.c
@@ -3,6 +3,9 @@
* Subject to the GPL, version 2.
*/
+#include <net/if_arp.h>
+#include <linux/if_ether.h>
+
#include "built_in.h"
#include "trafgen_l2.h"
#include "trafgen_proto.h"
@@ -26,7 +29,54 @@ static struct proto_hdr eth_hdr = {
.header_init = eth_header_init,
};
+static struct proto_field arp_fields[] = {
+ { .id = ARP_HTYPE, .len = 2 },
+ { .id = ARP_PTYPE, .len = 2, .offset = 2 },
+ { .id = ARP_HLEN, .len = 1, .offset = 4 },
+ { .id = ARP_PLEN, .len = 1, .offset = 5 },
+ { .id = ARP_OPER, .len = 2, .offset = 6 },
+ { .id = ARP_SHA, .len = 6, .offset = 8 },
+ { .id = ARP_SPA, .len = 4, .offset = 14 },
+ { .id = ARP_THA, .len = 6, .offset = 18 },
+ { .id = ARP_TPA, .len = 4, .offset = 24 },
+};
+
+static void arp_header_init(struct proto_hdr *hdr)
+{
+ struct proto_hdr *lower;
+
+ proto_lower_default_add(PROTO_ETH);
+
+ lower = proto_current_header();
+
+ if (lower->id == PROTO_ETH) {
+ uint8_t bcast[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+
+ proto_field_set_default_bytes(lower, ETH_DST_ADDR, bcast);
+ proto_field_set_default_be16(lower, ETH_PROTO_ID, ETH_P_ARP);
+ }
+
+ proto_header_fields_add(hdr, arp_fields, array_size(arp_fields));
+
+ /* Generate Announce request by default */
+ proto_field_set_default_be16(hdr, ARP_HTYPE, ARPHRD_ETHER);
+ proto_field_set_default_be16(hdr, ARP_PTYPE, ETH_P_IP);
+ proto_field_set_default_u8(hdr, ARP_HLEN, 6);
+ proto_field_set_default_u8(hdr, ARP_PLEN, 4);
+ proto_field_set_default_be16(hdr, ARP_OPER, ARPOP_REQUEST);
+ proto_field_set_default_dev_mac(hdr, ARP_SHA);
+ proto_field_set_default_dev_ipv4(hdr, ARP_SPA);
+ proto_field_set_default_dev_ipv4(hdr, ARP_TPA);
+}
+
+static struct proto_hdr arp_hdr = {
+ .id = PROTO_ARP,
+ .layer = PROTO_L2,
+ .header_init = arp_header_init,
+};
+
void protos_l2_init(void)
{
proto_header_register(&eth_hdr);
+ proto_header_register(&arp_hdr);
}