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Index: head/sys/netinet/tcp_stacks/rack.c
===================================================================
--- head/sys/netinet/tcp_stacks/rack.c
+++ head/sys/netinet/tcp_stacks/rack.c
@@ -7840,7 +7840,16 @@
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
@@ -7913,6 +7922,18 @@
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;
}
@@ -8414,15 +8435,9 @@
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. */

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