version 1.150.2.2, 2002/07/15 10:36:58 |
version 1.155, 2002/08/14 00:23:31 |
Line 572 ip_input(struct mbuf *m) |
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Line 572 ip_input(struct mbuf *m) |
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#endif |
#endif |
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/* |
/* |
* Convert fields to host representation. |
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*/ |
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NTOHS(ip->ip_len); |
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NTOHS(ip->ip_off); |
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/* |
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* Process options and, if not destined for us, |
* Process options and, if not destined for us, |
* ship it on. ip_dooptions returns 1 when an |
* ship it on. ip_dooptions returns 1 when an |
* error was detected (causing an icmp message |
* error was detected (causing an icmp message |
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* if the packet was previously fragmented, |
* if the packet was previously fragmented, |
* but it's not worth the time; just let them time out.) |
* but it's not worth the time; just let them time out.) |
*/ |
*/ |
if (ip->ip_off & ~(IP_DF|IP_RF)) { |
if (ip->ip_off & ~htons(IP_DF|IP_RF)) { |
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if (M_READONLY(m)) { |
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if ((m = m_pullup(m, hlen)) == NULL) { |
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ipstat.ips_toosmall++; |
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goto bad; |
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} |
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ip = mtod(m, struct ip *); |
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} |
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/* |
/* |
* Look for queue of fragments |
* Look for queue of fragments |
* of this datagram. |
* of this datagram. |
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* set ipqe_mff if more fragments are expected, |
* set ipqe_mff if more fragments are expected, |
* convert offset of this to bytes. |
* convert offset of this to bytes. |
*/ |
*/ |
ip->ip_len -= hlen; |
ip->ip_len = htons(ntohs(ip->ip_len) - hlen); |
mff = (ip->ip_off & IP_MF) != 0; |
mff = (ip->ip_off & htons(IP_MF)) != 0; |
if (mff) { |
if (mff) { |
/* |
/* |
* Make sure that fragments have a data length |
* Make sure that fragments have a data length |
* that's a non-zero multiple of 8 bytes. |
* that's a non-zero multiple of 8 bytes. |
*/ |
*/ |
if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) { |
if (ntohs(ip->ip_len) == 0 || |
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(ntohs(ip->ip_len) & 0x7) != 0) { |
ipstat.ips_badfrags++; |
ipstat.ips_badfrags++; |
IPQ_UNLOCK(); |
IPQ_UNLOCK(); |
goto bad; |
goto bad; |
} |
} |
} |
} |
ip->ip_off <<= 3; |
ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3); |
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/* |
/* |
* If datagram marked as having more fragments |
* If datagram marked as having more fragments |
* or if this is not the first fragment, |
* or if this is not the first fragment, |
* attempt reassembly; if it succeeds, proceed. |
* attempt reassembly; if it succeeds, proceed. |
*/ |
*/ |
if (mff || ip->ip_off) { |
if (mff || ip->ip_off != htons(0)) { |
ipstat.ips_fragments++; |
ipstat.ips_fragments++; |
ipqe = pool_get(&ipqent_pool, PR_NOWAIT); |
ipqe = pool_get(&ipqent_pool, PR_NOWAIT); |
if (ipqe == NULL) { |
if (ipqe == NULL) { |
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ipstat.ips_reassembled++; |
ipstat.ips_reassembled++; |
ip = mtod(m, struct ip *); |
ip = mtod(m, struct ip *); |
hlen = ip->ip_hl << 2; |
hlen = ip->ip_hl << 2; |
ip->ip_len += hlen; |
ip->ip_len = htons(ntohs(ip->ip_len) + hlen); |
} else |
} else |
if (fp) |
if (fp) |
ip_freef(fp); |
ip_freef(fp); |
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*/ |
*/ |
#if IFA_STATS |
#if IFA_STATS |
if (ia && ip) |
if (ia && ip) |
ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len; |
ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); |
#endif |
#endif |
ipstat.ips_delivered++; |
ipstat.ips_delivered++; |
{ |
{ |
Line 886 ip_reass(ipqe, fp) |
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Line 889 ip_reass(ipqe, fp) |
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*/ |
*/ |
for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; |
for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; |
p = q, q = TAILQ_NEXT(q, ipqe_q)) |
p = q, q = TAILQ_NEXT(q, ipqe_q)) |
if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off) |
if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off)) |
break; |
break; |
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/* |
/* |
Line 895 ip_reass(ipqe, fp) |
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Line 898 ip_reass(ipqe, fp) |
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* segment. If it provides all of our data, drop us. |
* segment. If it provides all of our data, drop us. |
*/ |
*/ |
if (p != NULL) { |
if (p != NULL) { |
i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len - |
i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) - |
ipqe->ipqe_ip->ip_off; |
ntohs(ipqe->ipqe_ip->ip_off); |
if (i > 0) { |
if (i > 0) { |
if (i >= ipqe->ipqe_ip->ip_len) |
if (i >= ntohs(ipqe->ipqe_ip->ip_len)) |
goto dropfrag; |
goto dropfrag; |
m_adj(ipqe->ipqe_m, i); |
m_adj(ipqe->ipqe_m, i); |
ipqe->ipqe_ip->ip_off += i; |
ipqe->ipqe_ip->ip_off = |
ipqe->ipqe_ip->ip_len -= i; |
htons(ntohs(ipqe->ipqe_ip->ip_off) + i); |
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ipqe->ipqe_ip->ip_len = |
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htons(ntohs(ipqe->ipqe_ip->ip_len) - i); |
} |
} |
} |
} |
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Line 910 ip_reass(ipqe, fp) |
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Line 915 ip_reass(ipqe, fp) |
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* While we overlap succeeding segments trim them or, |
* While we overlap succeeding segments trim them or, |
* if they are completely covered, dequeue them. |
* if they are completely covered, dequeue them. |
*/ |
*/ |
for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len > |
for (; q != NULL && |
q->ipqe_ip->ip_off; q = nq) { |
ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) > |
i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) - |
ntohs(q->ipqe_ip->ip_off); q = nq) { |
q->ipqe_ip->ip_off; |
i = (ntohs(ipqe->ipqe_ip->ip_off) + |
if (i < q->ipqe_ip->ip_len) { |
ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off); |
q->ipqe_ip->ip_len -= i; |
if (i < ntohs(q->ipqe_ip->ip_len)) { |
q->ipqe_ip->ip_off += i; |
q->ipqe_ip->ip_len = |
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htons(ntohs(q->ipqe_ip->ip_len) - i); |
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q->ipqe_ip->ip_off = |
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htons(ntohs(q->ipqe_ip->ip_off) + i); |
m_adj(q->ipqe_m, i); |
m_adj(q->ipqe_m, i); |
break; |
break; |
} |
} |
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next = 0; |
next = 0; |
for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; |
for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; |
p = q, q = TAILQ_NEXT(q, ipqe_q)) { |
p = q, q = TAILQ_NEXT(q, ipqe_q)) { |
if (q->ipqe_ip->ip_off != next) |
if (ntohs(q->ipqe_ip->ip_off) != next) |
return (0); |
return (0); |
next += q->ipqe_ip->ip_len; |
next += ntohs(q->ipqe_ip->ip_len); |
} |
} |
if (p->ipqe_mff) |
if (p->ipqe_mff) |
return (0); |
return (0); |
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* dequeue and discard fragment reassembly header. |
* dequeue and discard fragment reassembly header. |
* Make header visible. |
* Make header visible. |
*/ |
*/ |
ip->ip_len = next; |
ip->ip_len = htons(next); |
ip->ip_src = fp->ipq_src; |
ip->ip_src = fp->ipq_src; |
ip->ip_dst = fp->ipq_dst; |
ip->ip_dst = fp->ipq_dst; |
LIST_REMOVE(fp, ipq_q); |
LIST_REMOVE(fp, ipq_q); |
Line 1459 ip_stripoptions(m, mopt) |
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Line 1467 ip_stripoptions(m, mopt) |
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m->m_len -= olen; |
m->m_len -= olen; |
if (m->m_flags & M_PKTHDR) |
if (m->m_flags & M_PKTHDR) |
m->m_pkthdr.len -= olen; |
m->m_pkthdr.len -= olen; |
ip->ip_len -= olen; |
ip->ip_len = htons(ntohs(ip->ip_len) - olen); |
ip->ip_hl = sizeof (struct ip) >> 2; |
ip->ip_hl = sizeof (struct ip) >> 2; |
} |
} |
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Line 1549 ip_forward(m, srcrt) |
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Line 1557 ip_forward(m, srcrt) |
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* we need to generate an ICMP message to the src. |
* we need to generate an ICMP message to the src. |
* Pullup to avoid sharing mbuf cluster between m and mcopy. |
* Pullup to avoid sharing mbuf cluster between m and mcopy. |
*/ |
*/ |
mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT); |
mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); |
if (mcopy) |
if (mcopy) |
mcopy = m_pullup(mcopy, ip->ip_hl << 2); |
mcopy = m_pullup(mcopy, ip->ip_hl << 2); |
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