version 1.120, 2000/11/08 14:28:15 |
version 1.130.2.5, 2001/11/14 19:17:49 |
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* @(#)ip_input.c 8.2 (Berkeley) 1/4/94 |
* @(#)ip_input.c 8.2 (Berkeley) 1/4/94 |
*/ |
*/ |
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#include <sys/cdefs.h> |
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__KERNEL_RCSID(0, "$NetBSD$"); |
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#include "opt_gateway.h" |
#include "opt_gateway.h" |
#include "opt_pfil_hooks.h" |
#include "opt_pfil_hooks.h" |
#include "opt_ipsec.h" |
#include "opt_ipsec.h" |
#include "opt_mrouting.h" |
#include "opt_mrouting.h" |
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#include "opt_inet_csum.h" |
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#include <sys/param.h> |
#include <sys/param.h> |
#include <sys/systm.h> |
#include <sys/systm.h> |
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#include <sys/errno.h> |
#include <sys/errno.h> |
#include <sys/time.h> |
#include <sys/time.h> |
#include <sys/kernel.h> |
#include <sys/kernel.h> |
#include <sys/proc.h> |
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#include <sys/pool.h> |
#include <sys/pool.h> |
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#include <uvm/uvm_extern.h> |
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#include <sys/sysctl.h> |
#include <sys/sysctl.h> |
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#include <net/if.h> |
#include <net/if.h> |
Line 205 struct ifqueue ipintrq; |
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Line 205 struct ifqueue ipintrq; |
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struct ipstat ipstat; |
struct ipstat ipstat; |
u_int16_t ip_id; |
u_int16_t ip_id; |
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#ifdef PFIL_HOOKS |
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struct pfil_head inet_pfil_hook; |
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#endif |
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struct ipqhead ipq; |
struct ipqhead ipq; |
int ipq_locked; |
int ipq_locked; |
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int ip_nfragpackets = 0; |
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int ip_maxfragpackets = 200; |
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static __inline int ipq_lock_try __P((void)); |
static __inline int ipq_lock_try __P((void)); |
static __inline void ipq_unlock __P((void)); |
static __inline void ipq_unlock __P((void)); |
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{ |
{ |
int s; |
int s; |
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s = splimp(); |
/* |
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* Use splvm() -- we're bloking things that would cause |
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* mbuf allocation. |
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*/ |
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s = splvm(); |
if (ipq_locked) { |
if (ipq_locked) { |
splx(s); |
splx(s); |
return (0); |
return (0); |
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{ |
{ |
int s; |
int s; |
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s = splimp(); |
s = splvm(); |
ipq_locked = 0; |
ipq_locked = 0; |
splx(s); |
splx(s); |
} |
} |
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struct pool ipqent_pool; |
struct pool ipqent_pool; |
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#ifdef INET_CSUM_COUNTERS |
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#include <sys/device.h> |
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struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
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NULL, "inet", "hwcsum bad"); |
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struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
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NULL, "inet", "hwcsum ok"); |
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struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
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NULL, "inet", "swcsum"); |
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#define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ |
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#else |
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#define INET_CSUM_COUNTER_INCR(ev) /* nothing */ |
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#endif /* INET_CSUM_COUNTERS */ |
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/* |
/* |
* We need to save the IP options in case a protocol wants to respond |
* We need to save the IP options in case a protocol wants to respond |
* to an incoming packet over the same route if the packet got here |
* to an incoming packet over the same route if the packet got here |
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#ifdef GATEWAY |
#ifdef GATEWAY |
ipflow_init(); |
ipflow_init(); |
#endif |
#endif |
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#ifdef PFIL_HOOKS |
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/* Register our Packet Filter hook. */ |
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inet_pfil_hook.ph_type = PFIL_TYPE_AF; |
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inet_pfil_hook.ph_af = AF_INET; |
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i = pfil_head_register(&inet_pfil_hook); |
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if (i != 0) |
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printf("ip_init: WARNING: unable to register pfil hook, " |
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"error %d\n", i); |
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#endif /* PFIL_HOOKS */ |
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#ifdef INET_CSUM_COUNTERS |
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evcnt_attach_static(&ip_hwcsum_bad); |
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evcnt_attach_static(&ip_hwcsum_ok); |
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evcnt_attach_static(&ip_swcsum); |
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#endif /* INET_CSUM_COUNTERS */ |
} |
} |
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struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; |
struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; |
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struct mbuf *m; |
struct mbuf *m; |
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while (1) { |
while (1) { |
s = splimp(); |
s = splnet(); |
IF_DEQUEUE(&ipintrq, m); |
IF_DEQUEUE(&ipintrq, m); |
splx(s); |
splx(s); |
if (m == 0) |
if (m == 0) |
Line 350 ip_input(struct mbuf *m) |
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Line 394 ip_input(struct mbuf *m) |
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struct ipqent *ipqe; |
struct ipqent *ipqe; |
int hlen = 0, mff, len; |
int hlen = 0, mff, len; |
int downmatch; |
int downmatch; |
#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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#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if ((m->m_flags & M_PKTHDR) == 0) |
if ((m->m_flags & M_PKTHDR) == 0) |
Line 374 ip_input(struct mbuf *m) |
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Line 413 ip_input(struct mbuf *m) |
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* If no IP addresses have been set yet but the interfaces |
* If no IP addresses have been set yet but the interfaces |
* are receiving, can't do anything with incoming packets yet. |
* are receiving, can't do anything with incoming packets yet. |
*/ |
*/ |
if (in_ifaddr.tqh_first == 0) |
if (TAILQ_FIRST(&in_ifaddr) == 0) |
goto bad; |
goto bad; |
ipstat.ips_total++; |
ipstat.ips_total++; |
if (m->m_len < sizeof (struct ip) && |
if (m->m_len < sizeof (struct ip) && |
Line 405 ip_input(struct mbuf *m) |
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Line 444 ip_input(struct mbuf *m) |
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* not allowed. |
* not allowed. |
*/ |
*/ |
if (IN_MULTICAST(ip->ip_src.s_addr)) { |
if (IN_MULTICAST(ip->ip_src.s_addr)) { |
/* XXX stat */ |
ipstat.ips_badaddr++; |
goto bad; |
goto bad; |
} |
} |
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if (in_cksum(m, hlen) != 0) { |
/* 127/8 must not appear on wire - RFC1122 */ |
ipstat.ips_badsum++; |
if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || |
goto bad; |
(ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { |
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if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { |
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ipstat.ips_badaddr++; |
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goto bad; |
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} |
} |
} |
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/* |
switch (m->m_pkthdr.csum_flags & |
* Convert fields to host representation. |
((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | |
*/ |
M_CSUM_IPv4_BAD)) { |
NTOHS(ip->ip_len); |
case M_CSUM_IPv4|M_CSUM_IPv4_BAD: |
NTOHS(ip->ip_off); |
INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); |
len = ip->ip_len; |
goto badcsum; |
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case M_CSUM_IPv4: |
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/* Checksum was okay. */ |
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INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); |
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break; |
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default: |
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/* Must compute it ourselves. */ |
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INET_CSUM_COUNTER_INCR(&ip_swcsum); |
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if (in_cksum(m, hlen) != 0) |
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goto bad; |
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break; |
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} |
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/* Retrieve the packet length. */ |
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len = ntohs(ip->ip_len); |
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/* |
/* |
* Check for additional length bogosity |
* Check for additional length bogosity |
Line 466 ip_input(struct mbuf *m) |
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Line 525 ip_input(struct mbuf *m) |
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* Note that filters must _never_ set this flag, as another filter |
* Note that filters must _never_ set this flag, as another filter |
* in the list may have previously cleared it. |
* in the list may have previously cleared it. |
*/ |
*/ |
m0 = m; |
/* |
pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); |
* let ipfilter look at packet on the wire, |
for (; pfh; pfh = pfh->pfil_link.tqe_next) |
* not the decapsulated packet. |
if (pfh->pfil_func) { |
*/ |
rv = pfh->pfil_func(ip, hlen, |
#ifdef IPSEC |
m->m_pkthdr.rcvif, 0, &m0); |
if (!ipsec_getnhist(m)) |
if (rv) |
#else |
return; |
if (1) |
m = m0; |
#endif |
if (m == NULL) |
{ |
return; |
if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif, |
ip = mtod(m, struct ip *); |
PFIL_IN) != 0) |
} |
return; |
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if (m == NULL) |
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return; |
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ip = mtod(m, struct ip *); |
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} |
#endif /* PFIL_HOOKS */ |
#endif /* PFIL_HOOKS */ |
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#ifdef ALTQ |
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/* XXX Temporary until ALTQ is changed to use a pfil hook */ |
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if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) { |
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/* packet dropped by traffic conditioner */ |
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return; |
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} |
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#endif |
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/* |
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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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/* |
/* |
* 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 |
Line 499 ip_input(struct mbuf *m) |
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Line 576 ip_input(struct mbuf *m) |
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* as not mine. |
* as not mine. |
*/ |
*/ |
downmatch = 0; |
downmatch = 0; |
for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first; |
LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) { |
ia != NULL; |
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ia = ia->ia_hash.le_next) { |
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if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { |
if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { |
if ((ia->ia_ifp->if_flags & IFF_UP) != 0) |
if ((ia->ia_ifp->if_flags & IFF_UP) != 0) |
break; |
break; |
Line 512 ip_input(struct mbuf *m) |
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Line 587 ip_input(struct mbuf *m) |
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if (ia != NULL) |
if (ia != NULL) |
goto ours; |
goto ours; |
if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { |
if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { |
for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first; |
TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) { |
ifa != NULL; ifa = ifa->ifa_list.tqe_next) { |
if (ifa->ifa_addr->sa_family != AF_INET) |
if (ifa->ifa_addr->sa_family != AF_INET) continue; |
continue; |
ia = ifatoia(ifa); |
ia = ifatoia(ifa); |
if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || |
if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || |
in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || |
in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || |
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* of this datagram. |
* of this datagram. |
*/ |
*/ |
IPQ_LOCK(); |
IPQ_LOCK(); |
for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next) |
LIST_FOREACH(fp, &ipq, ipq_q) |
if (ip->ip_id == fp->ipq_id && |
if (ip->ip_id == fp->ipq_id && |
in_hosteq(ip->ip_src, fp->ipq_src) && |
in_hosteq(ip->ip_src, fp->ipq_src) && |
in_hosteq(ip->ip_dst, fp->ipq_dst) && |
in_hosteq(ip->ip_dst, fp->ipq_dst) && |
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IPQ_UNLOCK(); |
IPQ_UNLOCK(); |
} |
} |
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#ifdef IPSEC |
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/* |
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* enforce IPsec policy checking if we are seeing last header. |
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* note that we do not visit this with protocols with pcb layer |
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* code - like udp/tcp/raw ip. |
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*/ |
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if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 && |
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ipsec4_in_reject(m, NULL)) { |
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ipsecstat.in_polvio++; |
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goto bad; |
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} |
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#endif |
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/* |
/* |
* Switch out to protocol's input routine. |
* Switch out to protocol's input routine. |
*/ |
*/ |
#if IFA_STATS |
#if IFA_STATS |
ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len; |
if (ia && ip) |
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ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len; |
#endif |
#endif |
ipstat.ips_delivered++; |
ipstat.ips_delivered++; |
{ |
{ |
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} |
} |
bad: |
bad: |
m_freem(m); |
m_freem(m); |
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return; |
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badcsum: |
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ipstat.ips_badsum++; |
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m_freem(m); |
} |
} |
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/* |
/* |
Line 735 ip_reass(ipqe, fp) |
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Line 829 ip_reass(ipqe, fp) |
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* If first fragment to arrive, create a reassembly queue. |
* If first fragment to arrive, create a reassembly queue. |
*/ |
*/ |
if (fp == 0) { |
if (fp == 0) { |
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/* |
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* Enforce upper bound on number of fragmented packets |
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* for which we attempt reassembly; |
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* If maxfrag is 0, never accept fragments. |
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* If maxfrag is -1, accept all fragments without limitation. |
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*/ |
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if (ip_maxfragpackets < 0) |
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; |
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else if (ip_nfragpackets >= ip_maxfragpackets) |
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goto dropfrag; |
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ip_nfragpackets++; |
MALLOC(fp, struct ipq *, sizeof (struct ipq), |
MALLOC(fp, struct ipq *, sizeof (struct ipq), |
M_FTABLE, M_NOWAIT); |
M_FTABLE, M_NOWAIT); |
if (fp == NULL) |
if (fp == NULL) |
Line 753 ip_reass(ipqe, fp) |
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Line 858 ip_reass(ipqe, fp) |
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/* |
/* |
* Find a segment which begins after this one does. |
* Find a segment which begins after this one does. |
*/ |
*/ |
for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL; |
for (p = NULL, q = LIST_FIRST(&fp->ipq_fragq); q != NULL; |
p = q, q = q->ipqe_q.le_next) |
p = q, q = LIST_NEXT(q, ipqe_q)) |
if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off) |
if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off) |
break; |
break; |
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Line 789 ip_reass(ipqe, fp) |
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Line 894 ip_reass(ipqe, fp) |
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m_adj(q->ipqe_m, i); |
m_adj(q->ipqe_m, i); |
break; |
break; |
} |
} |
nq = q->ipqe_q.le_next; |
nq = LIST_NEXT(q, ipqe_q); |
m_freem(q->ipqe_m); |
m_freem(q->ipqe_m); |
LIST_REMOVE(q, ipqe_q); |
LIST_REMOVE(q, ipqe_q); |
pool_put(&ipqent_pool, q); |
pool_put(&ipqent_pool, q); |
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LIST_INSERT_AFTER(p, ipqe, ipqe_q); |
LIST_INSERT_AFTER(p, ipqe, ipqe_q); |
} |
} |
next = 0; |
next = 0; |
for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL; |
for (p = NULL, q = LIST_FIRST(&fp->ipq_fragq); q != NULL; |
p = q, q = q->ipqe_q.le_next) { |
p = q, q = LIST_NEXT(q, ipqe_q)) { |
if (q->ipqe_ip->ip_off != next) |
if (q->ipqe_ip->ip_off != next) |
return (0); |
return (0); |
next += q->ipqe_ip->ip_len; |
next += q->ipqe_ip->ip_len; |
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* Reassembly is complete. Check for a bogus message size and |
* Reassembly is complete. Check for a bogus message size and |
* concatenate fragments. |
* concatenate fragments. |
*/ |
*/ |
q = fp->ipq_fragq.lh_first; |
q = LIST_FIRST(&fp->ipq_fragq); |
ip = q->ipqe_ip; |
ip = q->ipqe_ip; |
if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) { |
if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) { |
ipstat.ips_toolong++; |
ipstat.ips_toolong++; |
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t = m->m_next; |
t = m->m_next; |
m->m_next = 0; |
m->m_next = 0; |
m_cat(m, t); |
m_cat(m, t); |
nq = q->ipqe_q.le_next; |
nq = LIST_NEXT(q, ipqe_q); |
pool_put(&ipqent_pool, q); |
pool_put(&ipqent_pool, q); |
for (q = nq; q != NULL; q = nq) { |
for (q = nq; q != NULL; q = nq) { |
t = q->ipqe_m; |
t = q->ipqe_m; |
nq = q->ipqe_q.le_next; |
nq = LIST_NEXT(q, ipqe_q); |
pool_put(&ipqent_pool, q); |
pool_put(&ipqent_pool, q); |
m_cat(m, t); |
m_cat(m, t); |
} |
} |
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ip->ip_dst = fp->ipq_dst; |
ip->ip_dst = fp->ipq_dst; |
LIST_REMOVE(fp, ipq_q); |
LIST_REMOVE(fp, ipq_q); |
FREE(fp, M_FTABLE); |
FREE(fp, M_FTABLE); |
|
ip_nfragpackets--; |
m->m_len += (ip->ip_hl << 2); |
m->m_len += (ip->ip_hl << 2); |
m->m_data -= (ip->ip_hl << 2); |
m->m_data -= (ip->ip_hl << 2); |
/* some debugging cruft by sklower, below, will go away soon */ |
/* some debugging cruft by sklower, below, will go away soon */ |
|
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|
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IPQ_LOCK_CHECK(); |
IPQ_LOCK_CHECK(); |
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for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) { |
for (q = LIST_FIRST(&fp->ipq_fragq); q != NULL; q = p) { |
p = q->ipqe_q.le_next; |
p = LIST_NEXT(q, ipqe_q); |
m_freem(q->ipqe_m); |
m_freem(q->ipqe_m); |
LIST_REMOVE(q, ipqe_q); |
LIST_REMOVE(q, ipqe_q); |
pool_put(&ipqent_pool, q); |
pool_put(&ipqent_pool, q); |
} |
} |
LIST_REMOVE(fp, ipq_q); |
LIST_REMOVE(fp, ipq_q); |
FREE(fp, M_FTABLE); |
FREE(fp, M_FTABLE); |
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ip_nfragpackets--; |
} |
} |
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/* |
/* |
|
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int s = splsoftnet(); |
int s = splsoftnet(); |
|
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IPQ_LOCK(); |
IPQ_LOCK(); |
for (fp = ipq.lh_first; fp != NULL; fp = nfp) { |
for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) { |
nfp = fp->ipq_q.le_next; |
nfp = LIST_NEXT(fp, ipq_q); |
if (--fp->ipq_ttl == 0) { |
if (--fp->ipq_ttl == 0) { |
ipstat.ips_fragtimeout++; |
ipstat.ips_fragtimeout++; |
ip_freef(fp); |
ip_freef(fp); |
} |
} |
} |
} |
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/* |
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* If we are over the maximum number of fragments |
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* (due to the limit being lowered), drain off |
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* enough to get down to the new limit. |
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*/ |
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if (ip_maxfragpackets < 0) |
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; |
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else { |
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while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq)) |
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ip_freef(LIST_FIRST(&ipq)); |
|
} |
IPQ_UNLOCK(); |
IPQ_UNLOCK(); |
#ifdef GATEWAY |
#ifdef GATEWAY |
ipflow_slowtimo(); |
ipflow_slowtimo(); |
|
|
if (ipq_lock_try() == 0) |
if (ipq_lock_try() == 0) |
return; |
return; |
|
|
while (ipq.lh_first != NULL) { |
while (LIST_FIRST(&ipq) != NULL) { |
ipstat.ips_fragdropped++; |
ipstat.ips_fragdropped++; |
ip_freef(ipq.lh_first); |
ip_freef(LIST_FIRST(&ipq)); |
} |
} |
|
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IPQ_UNLOCK(); |
IPQ_UNLOCK(); |
Line 1319 ip_stripoptions(m, mopt) |
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Line 1437 ip_stripoptions(m, mopt) |
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ip->ip_hl = sizeof (struct ip) >> 2; |
ip->ip_hl = sizeof (struct ip) >> 2; |
} |
} |
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int inetctlerrmap[PRC_NCMDS] = { |
const int inetctlerrmap[PRC_NCMDS] = { |
0, 0, 0, 0, |
0, 0, 0, 0, |
0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, |
0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, |
EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, |
EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, |
Line 1358 ip_forward(m, srcrt) |
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Line 1476 ip_forward(m, srcrt) |
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struct ifnet dummyifp; |
struct ifnet dummyifp; |
#endif |
#endif |
|
|
|
/* |
|
* Clear any in-bound checksum flags for this packet. |
|
*/ |
|
m->m_pkthdr.csum_flags = 0; |
|
|
dest = 0; |
dest = 0; |
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if (ipprintfs) |
if (ipprintfs) |
Line 1438 ip_forward(m, srcrt) |
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Line 1561 ip_forward(m, srcrt) |
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} |
} |
|
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#ifdef IPSEC |
#ifdef IPSEC |
/* Don't lookup socket in forwading case */ |
/* Don't lookup socket in forwarding case */ |
ipsec_setsocket(m, NULL); |
(void)ipsec_setsocket(m, NULL); |
#endif |
#endif |
error = ip_output(m, (struct mbuf *)0, &ipforward_rt, |
error = ip_output(m, (struct mbuf *)0, &ipforward_rt, |
(IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0); |
(IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0); |
Line 1745 ip_sysctl(name, namelen, oldp, oldlenp, |
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Line 1868 ip_sysctl(name, namelen, oldp, oldlenp, |
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return (error); |
return (error); |
#endif |
#endif |
|
|
|
case IPCTL_MAXFRAGPACKETS: |
|
return (sysctl_int(oldp, oldlenp, newp, newlen, |
|
&ip_maxfragpackets)); |
|
|
default: |
default: |
return (EOPNOTSUPP); |
return (EOPNOTSUPP); |
} |
} |