When sending in ICMP response to an SCTP packet,
* include the SCTP common header, if possible * include the first 8 bytes of the INIT chunk, if possible This provides the necesary information for the receiver of the ICMP packet to process it. MFC after: 1 week
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@ -61,6 +61,7 @@ __FBSDID("$FreeBSD$");
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#include <netinet/ip_icmp.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_options.h>
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#include <netinet/sctp.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_var.h>
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#include <netinet/tcpip.h>
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@ -249,6 +250,34 @@ icmp_error(struct mbuf *n, int type, int code, uint32_t dest, int mtu)
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goto freeit;
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icmpelen = max(tcphlen, min(V_icmp_quotelen,
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ntohs(oip->ip_len) - oiphlen));
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} else if (oip->ip_p == IPPROTO_SCTP) {
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struct sctphdr *sh;
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struct sctp_chunkhdr *ch;
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if (ntohs(oip->ip_len) < oiphlen + sizeof(struct sctphdr))
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goto stdreply;
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if (oiphlen + sizeof(struct sctphdr) > n->m_len &&
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n->m_next == NULL)
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goto stdreply;
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if (n->m_len < oiphlen + sizeof(struct sctphdr) &&
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(n = m_pullup(n, oiphlen + sizeof(struct sctphdr))) == NULL)
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goto freeit;
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icmpelen = max(sizeof(struct sctphdr),
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min(V_icmp_quotelen, ntohs(oip->ip_len) - oiphlen));
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sh = (struct sctphdr *)((caddr_t)oip + oiphlen);
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if (ntohl(sh->v_tag) == 0 &&
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ntohs(oip->ip_len) >= oiphlen + sizeof(struct sctphdr) + 8 &&
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(n->m_len >= oiphlen + sizeof(struct sctphdr) + 8 ||
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n->m_next != NULL)) {
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if (n->m_len < oiphlen + sizeof(struct sctphdr) + 8 &&
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(n = m_pullup(n, oiphlen + sizeof(struct sctphdr) + 8)) == NULL)
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goto freeit;
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ch = (struct sctp_chunkhdr *)(sh + 1);
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if (ch->chunk_type == SCTP_INITIATION) {
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icmpelen = max(sizeof(struct sctphdr) + 8,
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min(V_icmp_quotelen, ntohs(oip->ip_len) - oiphlen));
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}
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}
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} else
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stdreply: icmpelen = max(8, min(V_icmp_quotelen, ntohs(oip->ip_len) - oiphlen));
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