version 1.134, 2001/05/21 03:31:36 |
version 1.135.2.2, 2002/01/10 20:02:50 |
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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> |
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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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printf("ip_init: WARNING: unable to register pfil hook, " |
printf("ip_init: WARNING: unable to register pfil hook, " |
"error %d\n", i); |
"error %d\n", i); |
#endif /* PFIL_HOOKS */ |
#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 }; |
Line 389 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 433 ip_input(struct mbuf *m) |
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Line 457 ip_input(struct mbuf *m) |
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} |
} |
} |
} |
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if (in_cksum(m, hlen) != 0) { |
switch (m->m_pkthdr.csum_flags & |
ipstat.ips_badsum++; |
((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | |
goto bad; |
M_CSUM_IPv4_BAD)) { |
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case M_CSUM_IPv4|M_CSUM_IPv4_BAD: |
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INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); |
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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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/* Retrieve the packet length. */ |
/* Retrieve the packet length. */ |
Line 491 ip_input(struct mbuf *m) |
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Line 530 ip_input(struct mbuf *m) |
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* not the decapsulated packet. |
* not the decapsulated packet. |
*/ |
*/ |
#ifdef IPSEC |
#ifdef IPSEC |
if (!ipsec_gethist(m, NULL)) |
if (!ipsec_getnhist(m)) |
#else |
#else |
if (1) |
if (1) |
#endif |
#endif |
Line 502 ip_input(struct mbuf *m) |
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Line 541 ip_input(struct mbuf *m) |
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if (m == NULL) |
if (m == NULL) |
return; |
return; |
ip = mtod(m, struct ip *); |
ip = mtod(m, struct ip *); |
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hlen = ip->ip_hl << 2; |
} |
} |
#endif /* PFIL_HOOKS */ |
#endif /* PFIL_HOOKS */ |
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Line 537 ip_input(struct mbuf *m) |
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Line 577 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 550 ip_input(struct mbuf *m) |
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Line 588 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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} |
} |
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 816 ip_reass(ipqe, fp) |
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Line 859 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 852 ip_reass(ipqe, fp) |
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Line 895 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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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); |
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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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if (ip_maxfragpackets < 0) |
if (ip_maxfragpackets < 0) |
; |
; |
else { |
else { |
while (ip_nfragpackets > ip_maxfragpackets && ipq.lh_first) |
while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq)) |
ip_freef(ipq.lh_first); |
ip_freef(LIST_FIRST(&ipq)); |
} |
} |
IPQ_UNLOCK(); |
IPQ_UNLOCK(); |
#ifdef GATEWAY |
#ifdef GATEWAY |
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if (ipq_lock_try() == 0) |
if (ipq_lock_try() == 0) |
return; |
return; |
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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 1395 ip_stripoptions(m, mopt) |
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Line 1438 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 1434 ip_forward(m, srcrt) |
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Line 1477 ip_forward(m, srcrt) |
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struct ifnet dummyifp; |
struct ifnet dummyifp; |
#endif |
#endif |
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/* |
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* Clear any in-bound checksum flags for this packet. |
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*/ |
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m->m_pkthdr.csum_flags = 0; |
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dest = 0; |
dest = 0; |
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if (ipprintfs) |
if (ipprintfs) |