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libforge_socket.c

@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include "forge_socket.h"
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+
+// TODO: one day, we should actually add a libforge_socket to the forge_socket/userspace
+
+// Fills in all but the src/dst ip/port and seq/ack numbers
+// with some sane defaults
+struct tcp_state *forge_socket_get_default_state()
+{
+    struct tcp_state *st;
+    st = (struct tcp_state *)malloc(sizeof(struct tcp_state));
+    if (st == NULL) {
+        return NULL;
+    }
+    st->tstamp_ok = 0;
+    st->sack_ok = 0;
+    st->wscale_ok = 0;
+    st->ecn_ok = 0;
+    st->snd_wscale = 0;
+    st->rcv_wscale = 0;
+    st->snd_wnd = 0x1000;
+    st->rcv_wnd = 0x1000; 
+    //make sure you set snd_una = seq (TODO: fix this in module)
+
+    return st;
+}
+
+
+int forge_socket_set_state(int sock, struct tcp_state *st)
+{
+    struct sockaddr_in sin;
+    sin.sin_family      = AF_INET;
+    sin.sin_addr.s_addr = st->src_ip;
+    sin.sin_port        = st->sport;
+
+    // TODO: maybe not everyone wants this?
+    st->snd_una = st->seq;
+
+/*
+     // TOOD: do we need/want this?
+    if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, iface, strlen(iface)) < 0) {
+        perror("setsockopt SO_BINDTODEVICE");
+        return -1;
+    }
+*/
+
+    int value = 1;
+    if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &value, sizeof(value)) < 0) {
+        perror("setsockopt SO_REUSEADDR");
+        return -1;
+    }
+
+    if (setsockopt(sock, SOL_IP, IP_TRANSPARENT, &value, sizeof(value)) < 0) {
+        perror("setsockopt IP_TRANSPARENT");
+        return -1;
+    }
+
+    if (bind(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
+        perror("bind");
+        return -1;
+    }
+
+    if (setsockopt(sock, IPPROTO_TCP, TCP_STATE, st, sizeof(struct tcp_state)) < 0) {
+        perror("setsockopt TCP_STATE");
+        return -1;
+    }
+
+    return 0;
+}
+
+
+
+