Fixed bug in TCP.

Error occured when receiving a TCP segment wich has no local socket. (netbranch)

git-svn-id: svn://kolibrios.org@2600 a494cfbc-eb01-0410-851d-a64ba20cac60

kernel/branches/net/network/tcp_input.inc

@@ -45,18 +45,18 @@ TCP_input:
         pop     cx              ; previous checksum
         cmp     cx, dx
         pop     edx ecx
-        jne     .drop_not_locked
+        jne     .drop_no_socket
 
         DEBUGF  1,"Checksum ok\n"
 
         and     [edx + TCP_header.DataOffset], 0xf0                     ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header)
         shr     [edx + TCP_header.DataOffset], 2
         cmp     [edx + TCP_header.DataOffset], sizeof.TCP_header        ; Now see if it's at least the size of a standard TCP header
-        jb      .drop_not_locked                                        ; If not, drop the packet
+        jb      .drop_no_socket                                         ; If not, drop the packet
 
         movzx   eax, [edx + TCP_header.DataOffset]
         sub     ecx, eax                                                ; substract TCP header size from total segment size
-        jb      .drop_not_locked                                        ; If total segment size is less then the advertised header size, drop packet
+        jb      .drop_no_socket                                         ; If total segment size is less then the advertised header size, drop packet
         DEBUGF  1,"we got %u bytes of data\n", ecx
 
 ;-----------------------------------------------------------------------------------------
@@ -107,7 +107,7 @@ TCP_input:
   .socket_loop:
         mov     ebx, [ebx + SOCKET.NextPtr]
         or      ebx, ebx
-        jz      .drop_with_reset_not_locked
+        jz      .drop_with_reset_no_socket
 
         cmp     [ebx + SOCKET.Domain], AF_INET4
         jne     .socket_loop
@@ -1525,15 +1525,13 @@ align 4
 align 4
 .drop_with_reset:
 
+        DEBUGF  1,"Drop with reset\n"
+
         pusha
         lea     ecx, [ebx + SOCKET.mutex]
         call    mutex_unlock
         popa
 
-.drop_with_reset_not_locked:
-
-        DEBUGF  1,"Drop with reset\n"
-
         test    [edx + TCP_header.Flags], TH_RST
         jnz     .drop
 
@@ -1555,7 +1553,6 @@ align 4
         mov     cl, TH_RST
         call    TCP_respond_socket
         pop     ebx
-
         jmp     .destroy_new_socket
 
 
@@ -1565,15 +1562,12 @@ align 4
         mov     cl, TH_RST + TH_ACK
         call    TCP_respond_socket
         pop     ebx
-
         jmp     .destroy_new_socket
 
 
 
 
 
-
-
 ;-----
 ; Drop
 
@@ -1597,4 +1591,42 @@ align 4
 
         call    kernel_free
         add     esp, 4
-        ret
+        ret
+
+
+
+
+.drop_with_reset_no_socket:
+
+        DEBUGF  1,"Drop with reset (no socket)\n"
+
+        test    [edx + TCP_header.Flags], TH_RST
+        jnz     .drop_no_socket
+
+        ;;; if its a multicast/broadcast, also drop
+
+        test    [edx + TCP_header.Flags], TH_ACK
+        jnz     .respond_seg_ack
+
+        test    [edx + TCP_header.Flags], TH_SYN
+        jnz     .respond_seg_syn
+
+.drop_no_socket:
+
+        DEBUGF  1,"Drop (no socket)\n"
+
+        call    kernel_free
+        add     esp, 4
+        ret
+
+  .respond_seg_ack:
+
+        mov     cl, TH_RST
+        call    TCP_respond_segment
+        jmp     .drop_no_socket
+
+  .respond_seg_syn:
+
+        mov     cl, TH_RST + TH_ACK
+        call    TCP_respond_segment
+        jmp     .drop_no_socket

kernel/branches/net/network/tcp_subr.inc

@@ -313,8 +313,7 @@ TCP_respond_socket:
 ;-------------------------
 ; TCP_respond.segment:
 ;
-;  IN:  ebx = ptr to driver
+;  IN:  edx = segment ptr (a previously received segment)
-;       edx = segment ptr (a previously received segment)
 ;       edi = ptr to dest and src IPv4 addresses
 ;        cl = flags
 
@@ -326,14 +325,14 @@ TCP_respond_segment:
 ;---------------------
 ; Create the IP packet
 
-        push    cx edx ebx
+        push    cx edx
         mov     ebx, [edi + 4]
         mov     eax, [edi]
         mov     ecx, sizeof.TCP_header
         mov     di , IP_PROTO_TCP shl 8 + 128
         call    IPv4_output
         jz      .error
-        pop     ebx esi cx
+        pop     esi cx
 
         push    edx eax