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Fix UDP checksum for IPv6 in packet.lua

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This commit is contained in:
dmiller
2024-06-13 17:45:10 +00:00
parent e82d515416
commit 4b28defac6
1 changed files with 11 additions and 8 deletions
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19
nselib/packet.lua
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@@ -974,6 +974,7 @@ end
-- @return Whether the parsing succeeded.
function Packet:udp_parse(force_continue)
self.udp = true
self.ip_p = self.ip_p or IPPROTO_UDP
self.udp_offset = self.ip_data_offset or self.ip6_data_offset
if #self.buf < self.udp_offset + 4 then
return false
@@ -1035,15 +1036,17 @@ end
-- Count and save the UDP checksum field.
function Packet:udp_count_checksum()
self:udp_set_checksum(0)
local proto = self.ip_p
local length = self.buf:len() - self.udp_offset
local b = self.ip_bin_src ..
self.ip_bin_dst ..
"\0" ..
(">BI2"):pack(proto, length) ..
self.buf:sub(self.udp_offset+1)
local pseudo_header
local payload = self.buf:sub(self.udp_offset+1)
if self.ip_v == 4 then
pseudo_header = (">c4 c4 x B I2"):pack(self.ip_bin_src, self.ip_bin_dst,
IPPROTO_UDP, #payload)
elseif self.ip_v == 6 then
pseudo_header = (">c16 c16 I4 xxx B"):pack(self.ip_bin_src, self.ip_bin_dst,
#payload, IPPROTO_UDP)
end
self:udp_set_checksum(in_cksum(b))
self:udp_set_checksum(in_cksum(pseudo_header .. payload))
end
if not unittest.testing() then