version 1.28, 1996/02/13 23:42:37 |
version 1.43, 1996/12/20 09:08:14 |
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#include <netinet/ip_var.h> |
#include <netinet/ip_var.h> |
#include <netinet/ip_icmp.h> |
#include <netinet/ip_icmp.h> |
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#ifdef PFIL_HOOKS |
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#include <net/pfil.h> |
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#endif /* PFIL_HOOKS */ |
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#ifndef IPFORWARDING |
#ifndef IPFORWARDING |
#ifdef GATEWAY |
#ifdef GATEWAY |
#define IPFORWARDING 1 /* forward IP packets not for us */ |
#define IPFORWARDING 1 /* forward IP packets not for us */ |
Line 117 static struct ip_srcrt { |
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Line 121 static struct ip_srcrt { |
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} ip_srcrt; |
} ip_srcrt; |
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static void save_rte __P((u_char *, struct in_addr)); |
static void save_rte __P((u_char *, struct in_addr)); |
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/* |
/* |
* IP initialization: fill in IP protocol switch table. |
* IP initialization: fill in IP protocol switch table. |
* All protocols not implemented in kernel go to raw IP protocol handler. |
* All protocols not implemented in kernel go to raw IP protocol handler. |
Line 153 struct route ipforward_rt; |
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Line 158 struct route ipforward_rt; |
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void |
void |
ipintr() |
ipintr() |
{ |
{ |
register struct ip *ip; |
register struct ip *ip = NULL; |
register struct mbuf *m; |
register struct mbuf *m; |
register struct ipq *fp; |
register struct ipq *fp; |
register struct in_ifaddr *ia; |
register struct in_ifaddr *ia; |
struct ipqent *ipqe; |
struct ipqent *ipqe; |
int hlen, mff, s; |
int hlen = 0, mff, len, s; |
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#ifdef PFIL_HOOKS |
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struct packet_filter_hook *pfh; |
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struct mbuf *m0; |
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int rv; |
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#endif /* PFIL_HOOKS */ |
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next: |
next: |
/* |
/* |
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* Convert fields to host representation. |
* Convert fields to host representation. |
*/ |
*/ |
NTOHS(ip->ip_len); |
NTOHS(ip->ip_len); |
if (ip->ip_len < hlen) { |
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ipstat.ips_badlen++; |
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goto bad; |
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} |
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NTOHS(ip->ip_id); |
NTOHS(ip->ip_id); |
NTOHS(ip->ip_off); |
NTOHS(ip->ip_off); |
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len = ip->ip_len; |
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/* |
/* |
* Check that the amount of data in the buffers |
* Check that the amount of data in the buffers |
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* Trim mbufs if longer than we expect. |
* Trim mbufs if longer than we expect. |
* Drop packet if shorter than we expect. |
* Drop packet if shorter than we expect. |
*/ |
*/ |
if (m->m_pkthdr.len < ip->ip_len) { |
if (m->m_pkthdr.len < len) { |
ipstat.ips_tooshort++; |
ipstat.ips_tooshort++; |
goto bad; |
goto bad; |
} |
} |
if (m->m_pkthdr.len > ip->ip_len) { |
if (m->m_pkthdr.len > len) { |
if (m->m_len == m->m_pkthdr.len) { |
if (m->m_len == m->m_pkthdr.len) { |
m->m_len = ip->ip_len; |
m->m_len = len; |
m->m_pkthdr.len = ip->ip_len; |
m->m_pkthdr.len = len; |
} else |
} else |
m_adj(m, ip->ip_len - m->m_pkthdr.len); |
m_adj(m, len - m->m_pkthdr.len); |
} |
} |
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#ifdef PFIL_HOOKS |
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/* |
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* Run through list of hooks for input packets. |
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*/ |
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m0 = m; |
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for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.le_next) |
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if (pfh->pfil_func) { |
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rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0); |
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ip = mtod(m = m0, struct ip *); |
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if (rv) |
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goto next; |
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} |
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#endif /* PFIL_HOOKS */ |
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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 |
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* Check our list of addresses, to see if the packet is for us. |
* Check our list of addresses, to see if the packet is for us. |
*/ |
*/ |
for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) { |
for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) { |
if (ip->ip_dst.s_addr == ia->ia_addr.sin_addr.s_addr) |
if (in_hosteq(ip->ip_dst, ia->ia_addr.sin_addr)) |
goto ours; |
goto ours; |
if (((ip_directedbcast == 0) || (ip_directedbcast && |
if (((ip_directedbcast == 0) || (ip_directedbcast && |
ia->ia_ifp == m->m_pkthdr.rcvif)) && |
ia->ia_ifp == m->m_pkthdr.rcvif)) && |
(ia->ia_ifp->if_flags & IFF_BROADCAST)) { |
(ia->ia_ifp->if_flags & IFF_BROADCAST)) { |
if (ip->ip_dst.s_addr == ia->ia_broadaddr.sin_addr.s_addr || |
if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || |
ip->ip_dst.s_addr == ia->ia_netbroadcast.s_addr || |
in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || |
/* |
/* |
* Look for all-0's host part (old broadcast addr), |
* Look for all-0's host part (old broadcast addr), |
* either for subnet or net. |
* either for subnet or net. |
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goto ours; |
goto ours; |
} |
} |
if (ip->ip_dst.s_addr == INADDR_BROADCAST || |
if (ip->ip_dst.s_addr == INADDR_BROADCAST || |
ip->ip_dst.s_addr == INADDR_ANY) |
in_nullhost(ip->ip_dst)) |
goto ours; |
goto ours; |
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/* |
/* |
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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) { |
if (ip->ip_off & ~(IP_DF|IP_RF)) { |
if (m->m_flags & M_EXT) { /* XXX */ |
if (m->m_flags & M_EXT) { /* XXX */ |
if ((m = m_pullup(m, sizeof (struct ip))) == 0) { |
if ((m = m_pullup(m, sizeof (struct ip))) == 0) { |
ipstat.ips_toosmall++; |
ipstat.ips_toosmall++; |
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*/ |
*/ |
for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next) |
for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next) |
if (ip->ip_id == fp->ipq_id && |
if (ip->ip_id == fp->ipq_id && |
ip->ip_src.s_addr == fp->ipq_src.s_addr && |
in_hosteq(ip->ip_src, fp->ipq_src) && |
ip->ip_dst.s_addr == fp->ipq_dst.s_addr && |
in_hosteq(ip->ip_dst, fp->ipq_dst) && |
ip->ip_p == fp->ipq_p) |
ip->ip_p == fp->ipq_p) |
goto found; |
goto found; |
fp = 0; |
fp = 0; |
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return (0); |
return (0); |
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/* |
/* |
* Reassembly is complete; concatenate fragments. |
* Reassembly is complete. Check for a bogus message size and |
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* concatenate fragments. |
*/ |
*/ |
q = fp->ipq_fragq.lh_first; |
q = fp->ipq_fragq.lh_first; |
ip = q->ipqe_ip; |
ip = q->ipqe_ip; |
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if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) { |
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ipstat.ips_toolong++; |
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ip_freef(fp); |
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return (0); |
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} |
m = dtom(q->ipqe_ip); |
m = dtom(q->ipqe_ip); |
t = m->m_next; |
t = m->m_next; |
m->m_next = 0; |
m->m_next = 0; |
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if (opt == IPOPT_SSRR) { |
if (opt == IPOPT_SSRR) { |
#define INA struct in_ifaddr * |
#define INA struct in_ifaddr * |
#define SA struct sockaddr * |
#define SA struct sockaddr * |
if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0) |
ia = (INA)ifa_ifwithladdr((SA)&ipaddr); |
ia = (INA)ifa_ifwithnet((SA)&ipaddr); |
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} else |
} else |
ia = ip_rtaddr(ipaddr.sin_addr); |
ia = ip_rtaddr(ipaddr.sin_addr); |
if (ia == 0) { |
if (ia == 0) { |
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sin = satosin(&ipforward_rt.ro_dst); |
sin = satosin(&ipforward_rt.ro_dst); |
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if (ipforward_rt.ro_rt == 0 || dst.s_addr != sin->sin_addr.s_addr) { |
if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) { |
if (ipforward_rt.ro_rt) { |
if (ipforward_rt.ro_rt) { |
RTFREE(ipforward_rt.ro_rt); |
RTFREE(ipforward_rt.ro_rt); |
ipforward_rt.ro_rt = 0; |
ipforward_rt.ro_rt = 0; |
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*(mtod(m, struct in_addr *)) = *p--; |
*(mtod(m, struct in_addr *)) = *p--; |
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if (ipprintfs) |
if (ipprintfs) |
printf(" hops %lx", ntohl(mtod(m, struct in_addr *)->s_addr)); |
printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr)); |
#endif |
#endif |
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/* |
/* |
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while (p >= ip_srcrt.route) { |
while (p >= ip_srcrt.route) { |
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if (ipprintfs) |
if (ipprintfs) |
printf(" %lx", ntohl(q->s_addr)); |
printf(" %x", ntohl(q->s_addr)); |
#endif |
#endif |
*q++ = *p--; |
*q++ = *p--; |
} |
} |
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*q = ip_srcrt.dst; |
*q = ip_srcrt.dst; |
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if (ipprintfs) |
if (ipprintfs) |
printf(" %lx\n", ntohl(q->s_addr)); |
printf(" %x\n", ntohl(q->s_addr)); |
#endif |
#endif |
return (m); |
return (m); |
} |
} |
Line 1017 ip_forward(m, srcrt) |
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Line 1043 ip_forward(m, srcrt) |
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#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if (ipprintfs) |
if (ipprintfs) |
printf("forward: src %x dst %x ttl %x\n", |
printf("forward: src %x dst %x ttl %x\n", |
ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl); |
ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl); |
#endif |
#endif |
if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) { |
if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) { |
ipstat.ips_cantforward++; |
ipstat.ips_cantforward++; |
Line 1033 ip_forward(m, srcrt) |
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Line 1059 ip_forward(m, srcrt) |
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sin = satosin(&ipforward_rt.ro_dst); |
sin = satosin(&ipforward_rt.ro_dst); |
if ((rt = ipforward_rt.ro_rt) == 0 || |
if ((rt = ipforward_rt.ro_rt) == 0 || |
ip->ip_dst.s_addr != sin->sin_addr.s_addr) { |
!in_hosteq(ip->ip_dst, sin->sin_addr)) { |
if (ipforward_rt.ro_rt) { |
if (ipforward_rt.ro_rt) { |
RTFREE(ipforward_rt.ro_rt); |
RTFREE(ipforward_rt.ro_rt); |
ipforward_rt.ro_rt = 0; |
ipforward_rt.ro_rt = 0; |
} |
} |
sin->sin_family = AF_INET; |
sin->sin_family = AF_INET; |
sin->sin_len = sizeof(*sin); |
sin->sin_len = sizeof(struct sockaddr_in); |
sin->sin_addr = ip->ip_dst; |
sin->sin_addr = ip->ip_dst; |
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rtalloc(&ipforward_rt); |
rtalloc(&ipforward_rt); |
Line 1051 ip_forward(m, srcrt) |
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Line 1077 ip_forward(m, srcrt) |
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} |
} |
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/* |
/* |
* Save at most 64 bytes of the packet in case |
* Save at most 68 bytes of the packet in case |
* we need to generate an ICMP message to the src. |
* we need to generate an ICMP message to the src. |
*/ |
*/ |
mcopy = m_copy(m, 0, imin((int)ip->ip_len, 64)); |
mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68)); |
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/* |
/* |
* If forwarding packet using same interface that it came in on, |
* If forwarding packet using same interface that it came in on, |
Line 1066 ip_forward(m, srcrt) |
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Line 1092 ip_forward(m, srcrt) |
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*/ |
*/ |
if (rt->rt_ifp == m->m_pkthdr.rcvif && |
if (rt->rt_ifp == m->m_pkthdr.rcvif && |
(rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && |
(rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && |
satosin(rt_key(rt))->sin_addr.s_addr != 0 && |
!in_nullhost(satosin(rt_key(rt))->sin_addr) && |
ipsendredirects && !srcrt) { |
ipsendredirects && !srcrt) { |
if (rt->rt_ifa && |
if (rt->rt_ifa && |
(ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == |
(ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == |
Line 1080 ip_forward(m, srcrt) |
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Line 1106 ip_forward(m, srcrt) |
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code = ICMP_REDIRECT_HOST; |
code = ICMP_REDIRECT_HOST; |
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if (ipprintfs) |
if (ipprintfs) |
printf("redirect (%d) to %lx\n", code, (u_int32_t)dest); |
printf("redirect (%d) to %x\n", code, (u_int32_t)dest); |
#endif |
#endif |
} |
} |
} |
} |