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Better way to filter out IPv4 flags
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parent
b61eec5bc8
commit
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@ -67,7 +67,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
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if ((ip4->flags_offset | htons(IPV4_FLAG_DONT_FRAGMENT)) ==
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htons(IPV4_FLAG_DONT_FRAGMENT) ||
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((ip4->flags_offset & htons(IPV4_FLAG_MORE_FRAGMENTS)) &&
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(ip4->flags_offset & 0xff1f) == 0x0000 &&
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(ip4->flags_offset & htons(0x1fff)) == 0x0000 &&
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payload_size >= sizeof(struct s_tcp))) {
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/* parse TCP header */
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tcp = (struct s_tcp *) payload;
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@ -398,7 +398,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
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sizeof(struct s_ipv6_fragment) -
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FRAGMENT_LEN);
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frag->offset_flag = htons(((htons(ip4->flags_offset) &
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0xfffc) +
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0x1fff) +
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FRAGMENT_LEN / 8) << 3);
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if (ip4->flags_offset &
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htons(IPV4_FLAG_MORE_FRAGMENTS)) {
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