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Bugfix in IPv4_input (for fragmented IPv4 packets)

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git-svn-id: svn://kolibrios.org@4258 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
hidnplayr 2013-11-19 20:40:18 +00:00
parent 03195be388
commit f9853cf87d
1 changed files with 12 additions and 7 deletions
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19
kernel/trunk/network/IPv4.inc
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@ -319,7 +319,7 @@ IPv4_input: ; TODO: add IPv4
xchg al, ah
shl ax, 3
DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: fragmented packet offset=%u id=%x\n", ax, [edx + IPv4_header.Identification]:4
DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: fragmented packet offset=%u id=%x ptr=0x%x\n", ax, [edx + IPv4_header.Identification]:4, edx
test ax, ax ; Is this the first packet of the fragment?
jz .is_first_fragment
@ -460,12 +460,12 @@ IPv4_input: ; TODO: add IPv4
DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Fragment offset=%u\n", cx
lea edi, [eax + ecx] ; Notice that edi will be equal to eax for first fragment
movzx ebx, [edx + sizeof.IPv4_FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Find header size (in ebx) of fragment
movzx ebx, [edx + sizeof.IPv4_FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Find header size (in ebx) of fragment
and bx, 0x000F ;
shl bx, 2 ;
lea esi, [edx + sizeof.IPv4_FRAGMENT_entry] ; Set esi to the correct begin of fragment
movzx ecx, [edx + sizeof.IPv4_FRAGMENT_entry + IPv4_header.TotalLength] ; Calculate total length of fragment
lea esi, [edx + sizeof.IPv4_FRAGMENT_entry] ; Set esi to the correct begin of fragment
movzx ecx, [edx + sizeof.IPv4_FRAGMENT_entry + IPv4_header.TotalLength] ; Calculate total length of fragment
xchg cl, ch ; intel byte order
cmp edi, eax ; Is this packet the first fragment ?
@ -474,6 +474,8 @@ IPv4_input: ; TODO: add IPv4
add esi, ebx ;
.first_fragment:
DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Copying %u bytes from 0x%x to 0x%x\n", ecx, esi, edi
push cx ; First copy dword-wise, then byte-wise
shr cx, 2 ;
rep movsd ;
@ -482,11 +484,12 @@ IPv4_input: ; TODO: add IPv4
rep movsb ;
push eax
push [edx + IPv4_FRAGMENT_entry.Owner] ; we need to remeber the owner, in case this is the last packet
push [edx + IPv4_FRAGMENT_entry.NextPtr] ; Set edx to the next pointer
push edx ; Push pointer to fragment onto stack
mov ebx, [edx + IPv4_FRAGMENT_entry.Owner] ; we need to remeber the owner, in case this is the last packet
mov edx, [edx + IPv4_FRAGMENT_entry.NextPtr] ; Set edx to the next pointer
DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Next Fragment: 0x%x\n", edx
call NET_packet_free ; free the previous fragment buffer (this uses the value from stack)
pop eax
pop edx ebx eax
cmp edx, -1 ; Check if it is last fragment in chain
jne .rebuild_packet_loop
@ -498,6 +501,8 @@ IPv4_input: ; TODO: add IPv4
xchg cl, ch
push ecx
DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Packet is now de-fragmented\n"
push eax
jmp .handle_it ; edx = buf ptr, ecx = size, [esp] buf ptr, [esp+4], total size, ebx=device ptr