Author: tuexen Date: Wed Sep 25 10:40:49 2019 New Revision: 352673 URL: https://svnweb.freebsd.org/changeset/base/352673
Log: MFC r352512: When the RACK stack computes the space for user data in a TCP segment, it wasn't taking the IP level options into account. This patch fixes this. In addition, it also corrects a KASSERT and adds protection code to assure that the IP header chain and the TCP head fit in the first fragment as required by RFC 7112. Reviewed by: rrs@ Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D21666 Modified: stable/12/sys/netinet/tcp_stacks/rack.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netinet/tcp_stacks/rack.c ============================================================================== --- stable/12/sys/netinet/tcp_stacks/rack.c Wed Sep 25 10:38:44 2019 (r352672) +++ stable/12/sys/netinet/tcp_stacks/rack.c Wed Sep 25 10:40:49 2019 (r352673) @@ -7872,7 +7872,16 @@ send: hdrlen += sizeof(struct udphdr); } #endif - ipoptlen = 0; +#ifdef INET6 + if (isipv6) + ipoptlen = ip6_optlen(tp->t_inpcb); + else +#endif + if (tp->t_inpcb->inp_options) + ipoptlen = tp->t_inpcb->inp_options->m_len - + offsetof(struct ipoption, ipopt_list); + else + ipoptlen = 0; #if defined(IPSEC) || defined(IPSEC_SUPPORT) ipoptlen += ipsec_optlen; #endif @@ -7945,6 +7954,18 @@ send: sendalot = 1; } else { + if (optlen + ipoptlen > tp->t_maxseg) { + /* + * Since we don't have enough space to put + * the IP header chain and the TCP header in + * one packet as required by RFC 7112, don't + * send it. + */ + SOCKBUF_UNLOCK(&so->so_snd); + error = EMSGSIZE; + sack_rxmit = 0; + goto out; + } len = tp->t_maxseg - optlen - ipoptlen; sendalot = 1; } @@ -8438,15 +8459,9 @@ send: m->m_pkthdr.csum_flags |= CSUM_TSO; m->m_pkthdr.tso_segsz = tp->t_maxseg - optlen; } -#if defined(IPSEC) || defined(IPSEC_SUPPORT) - KASSERT(len + hdrlen + ipoptlen - ipsec_optlen == m_length(m, NULL), - ("%s: mbuf chain shorter than expected: %d + %u + %u - %u != %u", - __func__, len, hdrlen, ipoptlen, ipsec_optlen, m_length(m, NULL))); -#else - KASSERT(len + hdrlen + ipoptlen == m_length(m, NULL), - ("%s: mbuf chain shorter than expected: %d + %u + %u != %u", - __func__, len, hdrlen, ipoptlen, m_length(m, NULL))); -#endif + KASSERT(len + hdrlen == m_length(m, NULL), + ("%s: mbuf chain different than expected: %d + %u != %u", + __func__, len, hdrlen, m_length(m, NULL))); #ifdef TCP_HHOOK /* Run HHOOK_TCP_ESTABLISHED_OUT helper hooks. */ _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
