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Save ip_ttl value and restore it after checksum calculation.

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Since ipvoly is used for checksum calculation, part of original IP
header is zeroed. This part includes ip_ttl field, that can be used
later in IP_MINTTL socket option handling.

PR:		239799
MFC after:	1 week
This commit is contained in:
ae 2019-08-13 12:47:53 +00:00
parent ce02104e38
commit cdfc67a5b0
1 changed files with 3 additions and 0 deletions
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3
sys/netinet/tcp_input.c
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@ -554,6 +554,7 @@ tcp_input(struct mbuf **mp, int *offp, int proto)
int optlen = 0;
#ifdef INET
int len;
uint8_t ipttl;
#endif
int tlen = 0, off;
int drop_hdrlen;
@ -676,6 +677,7 @@ tcp_input(struct mbuf **mp, int *offp, int proto)
* Checksum extended TCP header and data.
*/
len = off0 + tlen;
ipttl = ip->ip_ttl;
bzero(ipov->ih_x1, sizeof(ipov->ih_x1));
ipov->ih_len = htons(tlen);
th->th_sum = in_cksum(m, len);
@ -684,6 +686,7 @@ tcp_input(struct mbuf **mp, int *offp, int proto)
/* Reset TOS bits */
ip->ip_tos = iptos;
/* Re-initialization for later version check */
ip->ip_ttl = ipttl;
ip->ip_v = IPVERSION;
ip->ip_hl = off0 >> 2;
}