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nfqws: allow to decrease udp length

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bol-van
2022-07-27 12:00:36 +03:00
parent 2d2217073a
commit 895af0f629
16 changed files with 36 additions and 14 deletions
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25
nfq/darkmagic.c
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@@ -294,15 +294,23 @@ bool prepare_tcp_segment(
}
// padlen<0 means payload shrinking
bool prepare_udp_segment4(
const struct sockaddr_in *src, const struct sockaddr_in *dst,
uint8_t ttl,
uint8_t fooling,
uint16_t padlen,
int padlen,
const void *data, uint16_t len,
uint8_t *buf, size_t *buflen)
{
uint16_t datalen = len + padlen;
if ((len+padlen)<=0) padlen=-(int)len+1; // do not allow payload to be less that 1 byte
if ((len+padlen)>0xFFFF) padlen=0xFFFF-len; // do not allow payload size to exceed u16 range
if (padlen<0)
{
len+=padlen;
padlen=0;
}
uint16_t datalen = (uint16_t)(len + padlen);
uint16_t ip_payload_len = sizeof(struct udphdr) + datalen;
uint16_t pktlen = sizeof(struct ip) + ip_payload_len;
if (pktlen>*buflen) return false;
@@ -327,11 +335,18 @@ bool prepare_udp_segment6(
const struct sockaddr_in6 *src, const struct sockaddr_in6 *dst,
uint8_t ttl,
uint8_t fooling,
uint16_t padlen,
int padlen,
const void *data, uint16_t len,
uint8_t *buf, size_t *buflen)
{
uint16_t datalen = len + padlen;
if ((len+padlen)<=0) padlen=-(int)len+1; // do not allow payload to be less that 1 byte
if ((len+padlen)>0xFFFF) padlen=0xFFFF-len; // do not allow payload size to exceed u16 range
if (padlen<0)
{
len+=padlen;
padlen=0;
}
uint16_t datalen = (uint16_t)(len + padlen);
uint16_t transport_payload_len = sizeof(struct udphdr) + datalen;
uint16_t ip_payload_len = transport_payload_len +
8*!!((fooling & (FOOL_HOPBYHOP|FOOL_HOPBYHOP2))==FOOL_HOPBYHOP) +
@@ -404,7 +419,7 @@ bool prepare_udp_segment(
const struct sockaddr *src, const struct sockaddr *dst,
uint8_t ttl,
uint8_t fooling,
uint16_t padlen,
int padlen,
const void *data, uint16_t len,
uint8_t *buf, size_t *buflen)
{