Date: Fri, 23 Aug 2019 10:12:42 +0000 (UTC) From: "Andrey V. Elsukov" <ae@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r351420 - stable/11/sys/netinet Message-ID: <201908231012.x7NACgNC084556@repo.freebsd.org>
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Author: ae Date: Fri Aug 23 10:12:42 2019 New Revision: 351420 URL: https://svnweb.freebsd.org/changeset/base/351420 Log: MFC r350974: Save ip_ttl value and restore it after checksum calculation. 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 Modified: stable/11/sys/netinet/tcp_input.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/netinet/tcp_input.c ============================================================================== --- stable/11/sys/netinet/tcp_input.c Fri Aug 23 10:11:10 2019 (r351419) +++ stable/11/sys/netinet/tcp_input.c Fri Aug 23 10:12:42 2019 (r351420) @@ -576,6 +576,7 @@ 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; @@ -697,6 +698,7 @@ 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); @@ -705,6 +707,7 @@ 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; }
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