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napt: fix checksum of UDP

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According to the UDP protocol, the checksum is optional.
so if the checksum is 0, this meaning the checksum is turn off, and no need to
correct checksum.

Signed-off-by: leo chung <gewalalb@gmail.com>
This commit is contained in:
leo chung
2021-06-18 16:23:34 +08:00
parent 1c1642fe45
commit bb63eed183
1 changed files with 6 additions and 3 deletions
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src/core/ipv4/ip4_napt.c
+6 -3
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@@ -567,10 +567,12 @@ static void
ip_napt_modify_port_udp(struct udp_hdr *udphdr, u8_t dest, u16_t newval)
{
if (dest) {
checksumadjust((u8_t *)&udphdr->chksum, (u8_t *)&udphdr->dest, 2, (u8_t *)&newval, 2);
if (udphdr->chksum != 0)
checksumadjust((u8_t *)&udphdr->chksum, (u8_t *)&udphdr->dest, 2, (u8_t *)&newval, 2);
udphdr->dest = newval;
} else {
checksumadjust((u8_t *)&udphdr->chksum, (u8_t *)&udphdr->src, 2, (u8_t *)&newval, 2);
if (udphdr->chksum != 0)
checksumadjust((u8_t *)&udphdr->chksum, (u8_t *)&udphdr->src, 2, (u8_t *)&newval, 2);
udphdr->src = newval;
}
}
@@ -578,7 +580,8 @@ ip_napt_modify_port_udp(struct udp_hdr *udphdr, u8_t dest, u16_t newval)
static void
ip_napt_modify_addr_udp(struct udp_hdr *udphdr, ip4_addr_p_t *oldval, u32_t newval)
{
checksumadjust( (u8_t *)&udphdr->chksum, (u8_t *)&oldval->addr, 4, (u8_t *)&newval, 4);
if (udphdr->chksum != 0)
checksumadjust( (u8_t *)&udphdr->chksum, (u8_t *)&oldval->addr, 4, (u8_t *)&newval, 4);
}
#endif /* LWIP_UDP */