#define _IP_VHL
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#include "faith.h"
#include <net/dlil.h>
#include <sys/kdebug.h>
#define DBG_LAYER_BEG NETDBG_CODE(DBG_NETIP, 1)
#define DBG_LAYER_END NETDBG_CODE(DBG_NETIP, 3)
#define DBG_FNC_IP_OUTPUT NETDBG_CODE(DBG_NETIP, (1 << 8) | 1)
#if vax
#include <machine/mtpr.h>
#endif
#if __FreeBSD__
#include <machine/in_cksum.h>
static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "internet multicast options");
#endif
#if IPSEC
#include <netinet6/ipsec.h>
#include <netkey/key.h>
#if IPSEC_DEBUG
#include <netkey/key_debug.h>
#else
#define KEYDEBUG(lev,arg)
#endif
#endif
#include <netinet/ip_fw.h>
#if DUMMYNET
#include <netinet/ip_dummynet.h>
#endif
#if IPFIREWALL_FORWARD_DEBUG
#define print_ip(a) printf("%ld.%ld.%ld.%ld",(ntohl(a.s_addr)>>24)&0xFF,\
(ntohl(a.s_addr)>>16)&0xFF,\
(ntohl(a.s_addr)>>8)&0xFF,\
(ntohl(a.s_addr))&0xFF);
#endif
u_short ip_id;
static struct mbuf *ip_insertoptions __P((struct mbuf *, struct mbuf *, int *));
static struct ifnet *ip_multicast_if __P((struct in_addr *, int *));
static void ip_mloopback
__P((struct ifnet *, struct mbuf *, struct sockaddr_in *, int));
static int ip_getmoptions
__P((struct sockopt *, struct ip_moptions *));
static int ip_pcbopts __P((int, struct mbuf **, struct mbuf *));
static int ip_setmoptions
__P((struct sockopt *, struct ip_moptions **));
int ip_optcopy __P((struct ip *, struct ip *));
extern int (*fr_checkp) __P((struct ip *, int, struct ifnet *, int, struct mbuf **));
#ifdef __APPLE__
extern struct mbuf* m_dup(register struct mbuf *m, int how);
#endif
static u_long lo_dl_tag = 0;
void in_delayed_cksum(struct mbuf *m);
extern int apple_hwcksum_tx;
extern struct protosw inetsw[];
extern struct ip_linklocal_stat ip_linklocal_stat;
#if IPSEC
extern int ipsec_bypass;
#endif
int
ip_output(m0, opt, ro, flags, imo)
struct mbuf *m0;
struct mbuf *opt;
struct route *ro;
int flags;
struct ip_moptions *imo;
{
struct ip *ip, *mhip;
struct ifnet *ifp;
u_long dl_tag;
struct mbuf *m = m0;
int hlen = sizeof (struct ip);
int len, off, error = 0;
struct sockaddr_in *dst;
struct in_ifaddr *ia = NULL;
int isbroadcast, sw_csum;
#if IPSEC
struct route iproute;
struct socket *so = NULL;
struct secpolicy *sp = NULL;
#endif
u_int16_t divert_cookie;
#if IPFIREWALL_FORWARD
int fwd_rewrite_src = 0;
#endif
struct ip_fw_chain *rule = NULL;
#if IPDIVERT
divert_cookie = ip_divert_cookie;
ip_divert_cookie = 0;
#else
divert_cookie = 0;
#endif
KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_START, 0,0,0,0,0);
#if IPFIREWALL && DUMMYNET
if (m->m_type == MT_DUMMYNET) {
rule = (struct ip_fw_chain *)(m->m_data) ;
opt = NULL ;
ro = & ( ((struct dn_pkt *)m)->ro ) ;
imo = NULL ;
dst = ((struct dn_pkt *)m)->dn_dst ;
ifp = ((struct dn_pkt *)m)->ifp ;
flags = ((struct dn_pkt *)m)->flags ;
m0 = m = m->m_next ;
#if IPSEC
if (ipsec_bypass == 0) {
so = ipsec_getsocket(m);
(void)ipsec_setsocket(m, NULL);
}
#endif
ip = mtod(m, struct ip *);
hlen = IP_VHL_HL(ip->ip_vhl) << 2 ;
if (ro->ro_rt != NULL)
ia = (struct in_ifaddr *)ro->ro_rt->rt_ifa;
goto sendit;
} else
rule = NULL ;
#endif
#if IPSEC
if (ipsec_bypass == 0) {
so = ipsec_getsocket(m);
(void)ipsec_setsocket(m, NULL);
}
#endif
#if DIAGNOSTIC
if ((m->m_flags & M_PKTHDR) == 0)
panic("ip_output no HDR");
if (!ro)
panic("ip_output no route, proto = %d",
mtod(m, struct ip *)->ip_p);
#endif
if (opt) {
m = ip_insertoptions(m, opt, &len);
hlen = len;
}
ip = mtod(m, struct ip *);
if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
ip->ip_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2);
ip->ip_off &= IP_DF;
#if RANDOM_IP_ID
ip->ip_id = ip_randomid();
#else
ip->ip_id = htons(ip_id++);
#endif
ipstat.ips_localout++;
} else {
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
}
KERNEL_DEBUG(DBG_LAYER_BEG, ip->ip_dst.s_addr,
ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len);
dst = (struct sockaddr_in *)&ro->ro_dst;
if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
rtfree(ro->ro_rt);
ro->ro_rt = (struct rtentry *)0;
}
if (ro->ro_rt == 0) {
dst->sin_family = AF_INET;
dst->sin_len = sizeof(*dst);
dst->sin_addr = ip->ip_dst;
}
#define ifatoia(ifa) ((struct in_ifaddr *)(ifa))
#define sintosa(sin) ((struct sockaddr *)(sin))
if (flags & IP_ROUTETOIF) {
if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0 &&
(ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) {
ipstat.ips_noroute++;
error = ENETUNREACH;
goto bad;
}
ifp = ia->ia_ifp;
dl_tag = ia->ia_ifa.ifa_dlt;
ip->ip_ttl = 1;
isbroadcast = in_broadcast(dst->sin_addr, ifp);
} else {
if (ro->ro_rt == 0)
rtalloc_ign(ro, RTF_PRCLONING);
if (ro->ro_rt == 0) {
ipstat.ips_noroute++;
error = EHOSTUNREACH;
goto bad;
}
ia = ifatoia(ro->ro_rt->rt_ifa);
ifp = ro->ro_rt->rt_ifp;
dl_tag = ro->ro_rt->rt_dlt;
ro->ro_rt->rt_use++;
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
if (ro->ro_rt->rt_flags & RTF_HOST)
isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST);
else
isbroadcast = in_broadcast(dst->sin_addr, ifp);
}
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
struct in_multi *inm;
m->m_flags |= M_MCAST;
dst = (struct sockaddr_in *)&ro->ro_dst;
if (imo != NULL) {
ip->ip_ttl = imo->imo_multicast_ttl;
if (imo->imo_multicast_ifp != NULL) {
ifp = imo->imo_multicast_ifp;
dl_tag = ifp->if_data.default_proto;
}
if (imo->imo_multicast_vif != -1)
ip->ip_src.s_addr =
ip_mcast_src(imo->imo_multicast_vif);
} else
ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
ipstat.ips_noroute++;
error = ENETUNREACH;
goto bad;
}
}
if (ip->ip_src.s_addr == INADDR_ANY) {
register struct in_ifaddr *ia1;
TAILQ_FOREACH(ia1, &in_ifaddrhead, ia_link)
if (ia1->ia_ifp == ifp) {
ip->ip_src = IA_SIN(ia1)->sin_addr;
break;
}
}
IN_LOOKUP_MULTI(ip->ip_dst, ifp, inm);
if (inm != NULL &&
(imo == NULL || imo->imo_multicast_loop)) {
ip_mloopback(ifp, m, dst, hlen);
}
else {
if (ip_mrouter && (flags & IP_FORWARDING) == 0) {
if (!rsvp_on)
imo = NULL;
if (ip_mforward(ip, ifp, m, imo) != 0) {
m_freem(m);
goto done;
}
}
}
if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
m_freem(m);
goto done;
}
goto sendit;
}
#ifndef notdef
if (ip->ip_src.s_addr == INADDR_ANY) {
ip->ip_src = IA_SIN(ia)->sin_addr;
#if IPFIREWALL_FORWARD
fwd_rewrite_src++;
#endif
}
#endif
if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >=
ifp->if_snd.ifq_maxlen) {
error = ENOBUFS;
goto bad;
}
if (isbroadcast) {
if ((ifp->if_flags & IFF_BROADCAST) == 0) {
error = EADDRNOTAVAIL;
goto bad;
}
if ((flags & IP_ALLOWBROADCAST) == 0) {
error = EACCES;
goto bad;
}
if ((u_short)ip->ip_len > ifp->if_mtu) {
error = EMSGSIZE;
goto bad;
}
m->m_flags |= M_BCAST;
} else {
m->m_flags &= ~M_BCAST;
}
sendit:
if (IN_LINKLOCAL(ntohl(ip->ip_src.s_addr)) || IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) {
ip_linklocal_stat.iplls_out_total++;
if (ip->ip_ttl != MAXTTL) {
ip_linklocal_stat.iplls_out_badttl++;
ip->ip_ttl = MAXTTL;
}
}
#if IPSEC
if (ipsec_bypass != 0)
goto skip_ipsec;
if (so == NULL)
sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, flags, &error);
else
sp = ipsec4_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error);
if (sp == NULL) {
ipsecstat.out_inval++;
goto bad;
}
error = 0;
switch (sp->policy) {
case IPSEC_POLICY_DISCARD:
ipsecstat.out_polvio++;
goto bad;
case IPSEC_POLICY_BYPASS:
case IPSEC_POLICY_NONE:
goto skip_ipsec;
case IPSEC_POLICY_IPSEC:
if (sp->req == NULL) {
error = key_spdacquire(sp);
goto bad;
}
break;
case IPSEC_POLICY_ENTRUST:
default:
printf("ip_output: Invalid policy found. %d\n", sp->policy);
}
{
struct ipsec_output_state state;
bzero(&state, sizeof(state));
state.m = m;
if (flags & IP_ROUTETOIF) {
state.ro = &iproute;
bzero(&iproute, sizeof(iproute));
} else
state.ro = ro;
state.dst = (struct sockaddr *)dst;
ip->ip_sum = 0;
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
in_delayed_cksum(m);
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
HTONS(ip->ip_len);
HTONS(ip->ip_off);
error = ipsec4_output(&state, sp, flags);
m = state.m;
if (flags & IP_ROUTETOIF) {
if (state.ro != &iproute || state.ro->ro_rt != NULL) {
flags &= ~IP_ROUTETOIF;
ro = state.ro;
}
} else
ro = state.ro;
dst = (struct sockaddr_in *)state.dst;
if (error) {
m0 = NULL;
switch (error) {
case EHOSTUNREACH:
case ENETUNREACH:
case EMSGSIZE:
case ENOBUFS:
case ENOMEM:
break;
default:
printf("ip4_output (ipsec): error code %d\n", error);
case ENOENT:
error = 0;
break;
}
goto bad;
}
}
ip = mtod(m, struct ip *);
#ifdef _IP_VHL
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
#else
hlen = ip->ip_hl << 2;
#endif
if (ro->ro_rt == NULL) {
if ((flags & IP_ROUTETOIF) == 0) {
printf("ip_output: "
"can't update route after IPsec processing\n");
error = EHOSTUNREACH;
goto bad;
}
} else {
ia = ifatoia(ro->ro_rt->rt_ifa);
ifp = ro->ro_rt->rt_ifp;
dl_tag = ia->ia_ifa.ifa_dlt;
}
NTOHS(ip->ip_len);
NTOHS(ip->ip_off);
skip_ipsec:
#endif
if (fr_checkp) {
struct mbuf *m1 = m;
if ((error = (*fr_checkp)(ip, hlen, ifp, 1, &m1)) || !m1)
goto done;
ip = mtod(m = m1, struct ip *);
}
if (fw_enable && ip_fw_chk_ptr) {
struct sockaddr_in *old = dst;
off = (*ip_fw_chk_ptr)(&ip,
hlen, ifp, &divert_cookie, &m, &rule, &dst);
if ( (off & IP_FW_PORT_DENY_FLAG) || m == NULL) {
if (m)
m_freem(m);
error = EACCES ;
goto done ;
}
ip = mtod(m, struct ip *);
if (off == 0 && dst == old)
goto pass ;
#if DUMMYNET
if ((off & IP_FW_PORT_DYNT_FLAG) != 0) {
error = dummynet_io(off & 0xffff, DN_TO_IP_OUT, m,
ifp,ro,dst,rule, flags);
goto done;
}
#endif
#if IPDIVERT
if (off != 0 && (off & IP_FW_PORT_DYNT_FLAG) == 0) {
struct mbuf *clone = NULL;
if ((off & IP_FW_PORT_TEE_FLAG) != 0)
clone = m_dup(m, M_DONTWAIT);
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
in_delayed_cksum(m);
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
HTONS(ip->ip_len);
HTONS(ip->ip_off);
ip_divert_cookie = divert_cookie;
divert_packet(m, 0, off & 0xffff);
if (clone != NULL) {
m = clone;
ip = mtod(m, struct ip *);
goto pass;
}
goto done;
}
#endif
#if IPFIREWALL_FORWARD
if (off == 0 && old != dst) {
struct in_ifaddr *ia;
static struct route sro_fwd, *ro_fwd = &sro_fwd;
#if IPFIREWALL_FORWARD_DEBUG
printf("IPFIREWALL_FORWARD: New dst ip: ");
print_ip(dst->sin_addr);
printf("\n");
#endif
TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
if (IA_SIN(ia)->sin_addr.s_addr ==
dst->sin_addr.s_addr)
break;
}
if (ia) {
ip_fw_fwd_addr = dst;
if (m->m_pkthdr.rcvif == NULL)
m->m_pkthdr.rcvif = ifunit("lo0");
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
m->m_pkthdr.csum_flags |=
CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
m0->m_pkthdr.csum_data = 0xffff;
}
m->m_pkthdr.csum_flags |=
CSUM_IP_CHECKED | CSUM_IP_VALID;
HTONS(ip->ip_len);
HTONS(ip->ip_off);
ip_input(m);
goto done;
}
bcopy(dst, &ro_fwd->ro_dst, sizeof(*dst));
ro_fwd->ro_rt = 0;
rtalloc_ign(ro_fwd, RTF_PRCLONING);
if (ro_fwd->ro_rt == 0) {
ipstat.ips_noroute++;
error = EHOSTUNREACH;
goto bad;
}
ia = ifatoia(ro_fwd->ro_rt->rt_ifa);
ifp = ro_fwd->ro_rt->rt_ifp;
dl_tag = ro_fwd->ro_rt->rt_dlt;
ro_fwd->ro_rt->rt_use++;
if (ro_fwd->ro_rt->rt_flags & RTF_GATEWAY)
dst = (struct sockaddr_in *)ro_fwd->ro_rt->rt_gateway;
if (ro_fwd->ro_rt->rt_flags & RTF_HOST)
isbroadcast =
(ro_fwd->ro_rt->rt_flags & RTF_BROADCAST);
else
isbroadcast = in_broadcast(dst->sin_addr, ifp);
rtfree(ro->ro_rt);
ro->ro_rt = ro_fwd->ro_rt;
dst = (struct sockaddr_in *)&ro_fwd->ro_dst;
if (fwd_rewrite_src)
ip->ip_src = IA_SIN(ia)->sin_addr;
goto pass ;
}
#endif
m_freem(m);
error = EACCES;
goto done;
}
pass:
m->m_pkthdr.csum_flags |= CSUM_IP;
sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist;
if ((ifp->if_hwassist & CSUM_TCP_SUM16) != 0) {
if (apple_hwcksum_tx && (m->m_pkthdr.csum_flags & CSUM_TCP)
&& (ip->ip_len > 50) && (ip->ip_len <= ifp->if_mtu)) {
u_short offset = (IP_VHL_HL(ip->ip_vhl) << 2) +14 ;
u_short csumprev= m->m_pkthdr.csum_data & 0xFFFF;
m->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_TCP_SUM16;
m->m_pkthdr.csum_data = (csumprev + offset) << 16 ;
m->m_pkthdr.csum_data += offset;
sw_csum = CSUM_DELAY_IP;
}
else {
sw_csum |= (CSUM_DELAY_DATA & m->m_pkthdr.csum_flags);
}
}
if (sw_csum & CSUM_DELAY_DATA) {
in_delayed_cksum(m);
sw_csum &= ~CSUM_DELAY_DATA;
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
m->m_pkthdr.csum_flags &= ifp->if_hwassist;
if ((u_short)ip->ip_len <= ifp->if_mtu ||
ifp->if_hwassist & CSUM_FRAGMENT) {
HTONS(ip->ip_len);
HTONS(ip->ip_off);
ip->ip_sum = 0;
if (sw_csum & CSUM_DELAY_IP) {
ip->ip_sum = in_cksum(m, hlen);
}
#ifndef __APPLE__
if (!(flags & IP_FORWARDING) && ia != NULL) {
ia->ia_ifa.if_opackets++;
ia->ia_ifa.if_obytes += m->m_pkthdr.len;
}
#endif
#if IPSEC
if (ipsec_bypass == 0)
ipsec_delaux(m);
#endif
#if __APPLE__
error = dlil_output(dl_tag, m, (void *) ro->ro_rt,
(struct sockaddr *)dst, 0);
#else
error = (*ifp->if_output)(ifp, m,
(struct sockaddr *)dst, ro->ro_rt);
#endif
goto done;
}
if (ip->ip_off & IP_DF) {
error = EMSGSIZE;
if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST))
&& !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU)
&& (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) {
ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu;
}
ipstat.ips_cantfrag++;
goto bad;
}
len = (ifp->if_mtu - hlen) &~ 7;
if (len < 8) {
error = EMSGSIZE;
goto bad;
}
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA &&
(ifp->if_hwassist & CSUM_IP_FRAGS) == 0) {
in_delayed_cksum(m);
if (m == NULL)
return(ENOMEM);
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
{
int mhlen, firstlen = len;
struct mbuf **mnext = &m->m_nextpkt;
int nfrags = 1;
m0 = m;
mhlen = sizeof (struct ip);
for (off = hlen + len; off < (u_short)ip->ip_len; off += len) {
MGETHDR(m, M_DONTWAIT, MT_HEADER);
if (m == 0) {
error = ENOBUFS;
ipstat.ips_odropped++;
goto sendorfree;
}
m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG;
m->m_data += max_linkhdr;
mhip = mtod(m, struct ip *);
*mhip = *ip;
if (hlen > sizeof (struct ip)) {
mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
mhip->ip_vhl = IP_MAKE_VHL(IPVERSION, mhlen >> 2);
}
m->m_len = mhlen;
mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF);
if (ip->ip_off & IP_MF)
mhip->ip_off |= IP_MF;
if (off + len >= (u_short)ip->ip_len)
len = (u_short)ip->ip_len - off;
else
mhip->ip_off |= IP_MF;
mhip->ip_len = htons((u_short)(len + mhlen));
m->m_next = m_copy(m0, off, len);
if (m->m_next == 0) {
(void) m_free(m);
error = ENOBUFS;
ipstat.ips_odropped++;
goto sendorfree;
}
m->m_pkthdr.len = mhlen + len;
m->m_pkthdr.rcvif = (struct ifnet *)0;
m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags;
HTONS(mhip->ip_off);
mhip->ip_sum = 0;
if (sw_csum & CSUM_DELAY_IP) {
mhip->ip_sum = in_cksum(m, mhlen);
}
*mnext = m;
mnext = &m->m_nextpkt;
nfrags++;
}
ipstat.ips_ofragments += nfrags;
m->m_flags |= M_LASTFRAG;
m0->m_flags |= M_FIRSTFRAG | M_FRAG;
m0->m_pkthdr.csum_data = nfrags;
m = m0;
m_adj(m, hlen + firstlen - (u_short)ip->ip_len);
m->m_pkthdr.len = hlen + firstlen;
ip->ip_len = htons((u_short)m->m_pkthdr.len);
ip->ip_off |= IP_MF;
HTONS(ip->ip_off);
ip->ip_sum = 0;
if (sw_csum & CSUM_DELAY_IP) {
ip->ip_sum = in_cksum(m, hlen);
}
sendorfree:
KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr,
ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len);
for (m = m0; m; m = m0) {
m0 = m->m_nextpkt;
m->m_nextpkt = 0;
#if IPSEC
if (ipsec_bypass == 0)
ipsec_delaux(m);
#endif
if (error == 0) {
#ifndef __APPLE__
if (ia != NULL) {
ia->ia_ifa.if_opackets++;
ia->ia_ifa.if_obytes += m->m_pkthdr.len;
}
#endif
#if __APPLE__
error = dlil_output(dl_tag, m, (void *) ro->ro_rt,
(struct sockaddr *)dst, 0);
#else
error = (*ifp->if_output)(ifp, m,
(struct sockaddr *)dst, ro->ro_rt);
#endif
} else
m_freem(m);
}
if (error == 0)
ipstat.ips_fragmented++;
}
done:
#if IPSEC
if (ipsec_bypass == 0) {
if (ro == &iproute && ro->ro_rt) {
rtfree(ro->ro_rt);
ro->ro_rt = NULL;
}
if (sp != NULL) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ip_output call free SP:%x\n", sp));
key_freesp(sp);
}
}
#endif
KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_END, error,0,0,0,0);
return (error);
bad:
m_freem(m0);
goto done;
}
void
in_delayed_cksum(struct mbuf *m)
{
struct ip *ip;
u_short csum, offset;
ip = mtod(m, struct ip *);
offset = IP_VHL_HL(ip->ip_vhl) << 2 ;
csum = in_cksum_skip(m, ip->ip_len, offset);
if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
csum = 0xffff;
offset += m->m_pkthdr.csum_data & 0xFFFF;
if (offset > ip->ip_len)
return;
if (offset + sizeof(u_short) > m->m_len) {
printf("delayed m_pullup, m->len: %d off: %d p: %d\n",
m->m_len, offset, ip->ip_p);
m = m_pullup(m, offset + sizeof(u_short));
}
*(u_short *)(m->m_data + offset) = csum;
}
static struct mbuf *
ip_insertoptions(m, opt, phlen)
register struct mbuf *m;
struct mbuf *opt;
int *phlen;
{
register struct ipoption *p = mtod(opt, struct ipoption *);
struct mbuf *n;
register struct ip *ip = mtod(m, struct ip *);
unsigned optlen;
optlen = opt->m_len - sizeof(p->ipopt_dst);
if (optlen + (u_short)ip->ip_len > IP_MAXPACKET)
return (m);
if (p->ipopt_dst.s_addr)
ip->ip_dst = p->ipopt_dst;
if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) {
MGETHDR(n, M_DONTWAIT, MT_HEADER);
if (n == 0)
return (m);
n->m_pkthdr.rcvif = (struct ifnet *)0;
n->m_pkthdr.len = m->m_pkthdr.len + optlen;
m->m_len -= sizeof(struct ip);
m->m_data += sizeof(struct ip);
n->m_next = m;
m = n;
m->m_len = optlen + sizeof(struct ip);
m->m_data += max_linkhdr;
(void)memcpy(mtod(m, void *), ip, sizeof(struct ip));
} else {
m->m_data -= optlen;
m->m_len += optlen;
m->m_pkthdr.len += optlen;
ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
}
ip = mtod(m, struct ip *);
bcopy(p->ipopt_list, ip + 1, optlen);
*phlen = sizeof(struct ip) + optlen;
ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2);
ip->ip_len += optlen;
return (m);
}
int
ip_optcopy(ip, jp)
struct ip *ip, *jp;
{
register u_char *cp, *dp;
int opt, optlen, cnt;
cp = (u_char *)(ip + 1);
dp = (u_char *)(jp + 1);
cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip);
for (; cnt > 0; cnt -= optlen, cp += optlen) {
opt = cp[0];
if (opt == IPOPT_EOL)
break;
if (opt == IPOPT_NOP) {
*dp++ = IPOPT_NOP;
optlen = 1;
continue;
}
#if DIAGNOSTIC
if (cnt < IPOPT_OLEN + sizeof(*cp))
panic("malformed IPv4 option passed to ip_optcopy");
#endif
optlen = cp[IPOPT_OLEN];
#if DIAGNOSTIC
if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt)
panic("malformed IPv4 option passed to ip_optcopy");
#endif
if (optlen > cnt)
optlen = cnt;
if (IPOPT_COPIED(opt)) {
bcopy(cp, dp, optlen);
dp += optlen;
}
}
for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++)
*dp++ = IPOPT_EOL;
return (optlen);
}
int
ip_ctloutput(so, sopt)
struct socket *so;
struct sockopt *sopt;
{
struct inpcb *inp = sotoinpcb(so);
int error, optval;
error = optval = 0;
if (sopt->sopt_level != IPPROTO_IP) {
return (EINVAL);
}
switch (sopt->sopt_dir) {
case SOPT_SET:
switch (sopt->sopt_name) {
case IP_OPTIONS:
#ifdef notyet
case IP_RETOPTS:
#endif
{
struct mbuf *m;
if (sopt->sopt_valsize > MLEN) {
error = EMSGSIZE;
break;
}
MGET(m, sopt->sopt_p ? M_WAIT : M_DONTWAIT, MT_HEADER);
if (m == 0) {
error = ENOBUFS;
break;
}
m->m_len = sopt->sopt_valsize;
error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
m->m_len);
if (error)
break;
return (ip_pcbopts(sopt->sopt_name, &inp->inp_options,
m));
}
case IP_TOS:
case IP_TTL:
case IP_RECVOPTS:
case IP_RECVRETOPTS:
case IP_RECVDSTADDR:
case IP_RECVIF:
#if defined(NFAITH) && NFAITH > 0
case IP_FAITH:
#endif
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
break;
switch (sopt->sopt_name) {
case IP_TOS:
inp->inp_ip_tos = optval;
break;
case IP_TTL:
inp->inp_ip_ttl = optval;
break;
#define OPTSET(bit) \
if (optval) \
inp->inp_flags |= bit; \
else \
inp->inp_flags &= ~bit;
case IP_RECVOPTS:
OPTSET(INP_RECVOPTS);
break;
case IP_RECVRETOPTS:
OPTSET(INP_RECVRETOPTS);
break;
case IP_RECVDSTADDR:
OPTSET(INP_RECVDSTADDR);
break;
case IP_RECVIF:
OPTSET(INP_RECVIF);
break;
#if defined(NFAITH) && NFAITH > 0
case IP_FAITH:
OPTSET(INP_FAITH);
break;
#endif
}
break;
#undef OPTSET
case IP_MULTICAST_IF:
case IP_MULTICAST_VIF:
case IP_MULTICAST_TTL:
case IP_MULTICAST_LOOP:
case IP_ADD_MEMBERSHIP:
case IP_DROP_MEMBERSHIP:
error = ip_setmoptions(sopt, &inp->inp_moptions);
break;
case IP_PORTRANGE:
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
break;
switch (optval) {
case IP_PORTRANGE_DEFAULT:
inp->inp_flags &= ~(INP_LOWPORT);
inp->inp_flags &= ~(INP_HIGHPORT);
break;
case IP_PORTRANGE_HIGH:
inp->inp_flags &= ~(INP_LOWPORT);
inp->inp_flags |= INP_HIGHPORT;
break;
case IP_PORTRANGE_LOW:
inp->inp_flags &= ~(INP_HIGHPORT);
inp->inp_flags |= INP_LOWPORT;
break;
default:
error = EINVAL;
break;
}
break;
#if IPSEC
case IP_IPSEC_POLICY:
{
caddr_t req = NULL;
size_t len = 0;
int priv;
struct mbuf *m;
int optname;
if ((error = soopt_getm(sopt, &m)) != 0)
break;
if ((error = soopt_mcopyin(sopt, m)) != 0)
break;
priv = (sopt->sopt_p != NULL &&
suser(sopt->sopt_p->p_ucred,
&sopt->sopt_p->p_acflag) != 0) ? 0 : 1;
if (m) {
req = mtod(m, caddr_t);
len = m->m_len;
}
optname = sopt->sopt_name;
error = ipsec4_set_policy(inp, optname, req, len, priv);
m_freem(m);
break;
}
#endif
default:
error = ENOPROTOOPT;
break;
}
break;
case SOPT_GET:
switch (sopt->sopt_name) {
case IP_OPTIONS:
case IP_RETOPTS:
if (inp->inp_options)
error = sooptcopyout(sopt,
mtod(inp->inp_options,
char *),
inp->inp_options->m_len);
else
sopt->sopt_valsize = 0;
break;
case IP_TOS:
case IP_TTL:
case IP_RECVOPTS:
case IP_RECVRETOPTS:
case IP_RECVDSTADDR:
case IP_RECVIF:
case IP_PORTRANGE:
#if defined(NFAITH) && NFAITH > 0
case IP_FAITH:
#endif
switch (sopt->sopt_name) {
case IP_TOS:
optval = inp->inp_ip_tos;
break;
case IP_TTL:
optval = inp->inp_ip_ttl;
break;
#define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
case IP_RECVOPTS:
optval = OPTBIT(INP_RECVOPTS);
break;
case IP_RECVRETOPTS:
optval = OPTBIT(INP_RECVRETOPTS);
break;
case IP_RECVDSTADDR:
optval = OPTBIT(INP_RECVDSTADDR);
break;
case IP_RECVIF:
optval = OPTBIT(INP_RECVIF);
break;
case IP_PORTRANGE:
if (inp->inp_flags & INP_HIGHPORT)
optval = IP_PORTRANGE_HIGH;
else if (inp->inp_flags & INP_LOWPORT)
optval = IP_PORTRANGE_LOW;
else
optval = 0;
break;
#if defined(NFAITH) && NFAITH > 0
case IP_FAITH:
optval = OPTBIT(INP_FAITH);
break;
#endif
}
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case IP_MULTICAST_IF:
case IP_MULTICAST_VIF:
case IP_MULTICAST_TTL:
case IP_MULTICAST_LOOP:
case IP_ADD_MEMBERSHIP:
case IP_DROP_MEMBERSHIP:
error = ip_getmoptions(sopt, inp->inp_moptions);
break;
#if IPSEC
case IP_IPSEC_POLICY:
{
struct mbuf *m = NULL;
caddr_t req = NULL;
size_t len = 0;
if (m != 0) {
req = mtod(m, caddr_t);
len = m->m_len;
}
error = ipsec4_get_policy(sotoinpcb(so), req, len, &m);
if (error == 0)
error = soopt_mcopyout(sopt, m);
if (error == 0)
m_freem(m);
break;
}
#endif
default:
error = ENOPROTOOPT;
break;
}
break;
}
return (error);
}
static int
ip_pcbopts(optname, pcbopt, m)
int optname;
struct mbuf **pcbopt;
register struct mbuf *m;
{
register int cnt, optlen;
register u_char *cp;
u_char opt;
if (*pcbopt)
(void)m_free(*pcbopt);
*pcbopt = 0;
if (m == (struct mbuf *)0 || m->m_len == 0) {
if (m)
(void)m_free(m);
return (0);
}
#ifndef vax
if (m->m_len % sizeof(int32_t))
goto bad;
#endif
if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN])
goto bad;
cnt = m->m_len;
m->m_len += sizeof(struct in_addr);
cp = mtod(m, u_char *) + sizeof(struct in_addr);
ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt);
bzero(mtod(m, caddr_t), sizeof(struct in_addr));
for (; cnt > 0; cnt -= optlen, cp += optlen) {
opt = cp[IPOPT_OPTVAL];
if (opt == IPOPT_EOL)
break;
if (opt == IPOPT_NOP)
optlen = 1;
else {
if (cnt < IPOPT_OLEN + sizeof(*cp))
goto bad;
optlen = cp[IPOPT_OLEN];
if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt)
goto bad;
}
switch (opt) {
default:
break;
case IPOPT_LSRR:
case IPOPT_SSRR:
if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr))
goto bad;
m->m_len -= sizeof(struct in_addr);
cnt -= sizeof(struct in_addr);
optlen -= sizeof(struct in_addr);
cp[IPOPT_OLEN] = optlen;
bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t),
sizeof(struct in_addr));
ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] +
sizeof(struct in_addr)),
(caddr_t)&cp[IPOPT_OFFSET+1],
(unsigned)cnt + sizeof(struct in_addr));
break;
}
}
if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr))
goto bad;
*pcbopt = m;
return (0);
bad:
(void)m_free(m);
return (EINVAL);
}
static struct ifnet *
ip_multicast_if(a, ifindexp)
struct in_addr *a;
int *ifindexp;
{
int ifindex;
struct ifnet *ifp;
if (ifindexp)
*ifindexp = 0;
if (ntohl(a->s_addr) >> 24 == 0) {
ifindex = ntohl(a->s_addr) & 0xffffff;
if (ifindex < 0 || if_index < ifindex)
return NULL;
ifp = ifindex2ifnet[ifindex];
if (ifindexp)
*ifindexp = ifindex;
} else {
INADDR_TO_IFP(*a, ifp);
}
return ifp;
}
static int
ip_setmoptions(sopt, imop)
struct sockopt *sopt;
struct ip_moptions **imop;
{
int error = 0;
int i;
struct in_addr addr;
struct ip_mreq mreq;
struct ifnet *ifp = NULL;
struct ip_moptions *imo = *imop;
struct route ro;
struct sockaddr_in *dst;
int ifindex;
int s;
if (imo == NULL) {
imo = (struct ip_moptions*) _MALLOC(sizeof(*imo), M_IPMOPTS,
M_WAITOK);
if (imo == NULL)
return (ENOBUFS);
*imop = imo;
imo->imo_multicast_ifp = NULL;
imo->imo_multicast_addr.s_addr = INADDR_ANY;
imo->imo_multicast_vif = -1;
imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
imo->imo_num_memberships = 0;
}
switch (sopt->sopt_name) {
case IP_MULTICAST_VIF:
if (legal_vif_num == 0) {
error = EOPNOTSUPP;
break;
}
error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
if (error)
break;
if (!legal_vif_num(i) && (i != -1)) {
error = EINVAL;
break;
}
imo->imo_multicast_vif = i;
break;
case IP_MULTICAST_IF:
error = sooptcopyin(sopt, &addr, sizeof addr, sizeof addr);
if (error)
break;
if (addr.s_addr == INADDR_ANY) {
imo->imo_multicast_ifp = NULL;
break;
}
s = splimp();
ifp = ip_multicast_if(&addr, &ifindex);
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
splx(s);
error = EADDRNOTAVAIL;
break;
}
imo->imo_multicast_ifp = ifp;
if (ifindex)
imo->imo_multicast_addr = addr;
else
imo->imo_multicast_addr.s_addr = INADDR_ANY;
splx(s);
break;
case IP_MULTICAST_TTL:
if (sopt->sopt_valsize == 1) {
u_char ttl;
error = sooptcopyin(sopt, &ttl, 1, 1);
if (error)
break;
imo->imo_multicast_ttl = ttl;
} else {
u_int ttl;
error = sooptcopyin(sopt, &ttl, sizeof ttl,
sizeof ttl);
if (error)
break;
if (ttl > 255)
error = EINVAL;
else
imo->imo_multicast_ttl = ttl;
}
break;
case IP_MULTICAST_LOOP:
if (sopt->sopt_valsize == 1) {
u_char loop;
error = sooptcopyin(sopt, &loop, 1, 1);
if (error)
break;
imo->imo_multicast_loop = !!loop;
} else {
u_int loop;
error = sooptcopyin(sopt, &loop, sizeof loop,
sizeof loop);
if (error)
break;
imo->imo_multicast_loop = !!loop;
}
break;
case IP_ADD_MEMBERSHIP:
error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
if (error)
break;
if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
error = EINVAL;
break;
}
s = splimp();
if (mreq.imr_interface.s_addr == INADDR_ANY) {
bzero((caddr_t)&ro, sizeof(ro));
dst = (struct sockaddr_in *)&ro.ro_dst;
dst->sin_len = sizeof(*dst);
dst->sin_family = AF_INET;
dst->sin_addr = mreq.imr_multiaddr;
rtalloc(&ro);
if (ro.ro_rt != NULL) {
ifp = ro.ro_rt->rt_ifp;
rtfree(ro.ro_rt);
}
else {
mreq.imr_interface.s_addr = INADDR_LOOPBACK;
}
}
if (ifp == NULL) {
ifp = ip_multicast_if(&mreq.imr_interface, NULL);
}
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
error = EADDRNOTAVAIL;
splx(s);
break;
}
for (i = 0; i < imo->imo_num_memberships; ++i) {
if (imo->imo_membership[i]->inm_ifp == ifp &&
imo->imo_membership[i]->inm_addr.s_addr
== mreq.imr_multiaddr.s_addr)
break;
}
if (i < imo->imo_num_memberships) {
error = EADDRINUSE;
splx(s);
break;
}
if (i == IP_MAX_MEMBERSHIPS) {
error = ETOOMANYREFS;
splx(s);
break;
}
if ((imo->imo_membership[i] =
in_addmulti(&mreq.imr_multiaddr, ifp)) == NULL) {
error = ENOBUFS;
splx(s);
break;
}
++imo->imo_num_memberships;
splx(s);
break;
case IP_DROP_MEMBERSHIP:
error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
if (error)
break;
if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
error = EINVAL;
break;
}
s = splimp();
if (mreq.imr_interface.s_addr == INADDR_ANY)
ifp = NULL;
else {
ifp = ip_multicast_if(&mreq.imr_interface, NULL);
if (ifp == NULL) {
error = EADDRNOTAVAIL;
splx(s);
break;
}
}
for (i = 0; i < imo->imo_num_memberships; ++i) {
if ((ifp == NULL ||
imo->imo_membership[i]->inm_ifp == ifp) &&
imo->imo_membership[i]->inm_addr.s_addr ==
mreq.imr_multiaddr.s_addr)
break;
}
if (i == imo->imo_num_memberships) {
error = EADDRNOTAVAIL;
splx(s);
break;
}
in_delmulti(imo->imo_membership[i]);
for (++i; i < imo->imo_num_memberships; ++i)
imo->imo_membership[i-1] = imo->imo_membership[i];
--imo->imo_num_memberships;
splx(s);
break;
default:
error = EOPNOTSUPP;
break;
}
if (imo->imo_multicast_ifp == NULL &&
imo->imo_multicast_vif == -1 &&
imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL &&
imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP &&
imo->imo_num_memberships == 0) {
FREE(*imop, M_IPMOPTS);
*imop = NULL;
}
return (error);
}
static int
ip_getmoptions(sopt, imo)
struct sockopt *sopt;
register struct ip_moptions *imo;
{
struct in_addr addr;
struct in_ifaddr *ia;
int error, optval;
u_char coptval;
error = 0;
switch (sopt->sopt_name) {
case IP_MULTICAST_VIF:
if (imo != NULL)
optval = imo->imo_multicast_vif;
else
optval = -1;
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case IP_MULTICAST_IF:
if (imo == NULL || imo->imo_multicast_ifp == NULL)
addr.s_addr = INADDR_ANY;
else if (imo->imo_multicast_addr.s_addr) {
addr = imo->imo_multicast_addr;
} else {
IFP_TO_IA(imo->imo_multicast_ifp, ia);
addr.s_addr = (ia == NULL) ? INADDR_ANY
: IA_SIN(ia)->sin_addr.s_addr;
}
error = sooptcopyout(sopt, &addr, sizeof addr);
break;
case IP_MULTICAST_TTL:
if (imo == 0)
optval = coptval = IP_DEFAULT_MULTICAST_TTL;
else
optval = coptval = imo->imo_multicast_ttl;
if (sopt->sopt_valsize == 1)
error = sooptcopyout(sopt, &coptval, 1);
else
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case IP_MULTICAST_LOOP:
if (imo == 0)
optval = coptval = IP_DEFAULT_MULTICAST_LOOP;
else
optval = coptval = imo->imo_multicast_loop;
if (sopt->sopt_valsize == 1)
error = sooptcopyout(sopt, &coptval, 1);
else
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
default:
error = ENOPROTOOPT;
break;
}
return (error);
}
void
ip_freemoptions(imo)
register struct ip_moptions *imo;
{
register int i;
if (imo != NULL) {
for (i = 0; i < imo->imo_num_memberships; ++i)
if (imo->imo_membership[i] != NULL)
in_delmulti(imo->imo_membership[i]);
FREE(imo, M_IPMOPTS);
}
}
static void
ip_mloopback(ifp, m, dst, hlen)
struct ifnet *ifp;
register struct mbuf *m;
register struct sockaddr_in *dst;
int hlen;
{
register struct ip *ip;
struct mbuf *copym;
copym = m_copy(m, 0, M_COPYALL);
if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen))
copym = m_pullup(copym, hlen);
if (copym != NULL) {
ip = mtod(copym, struct ip *);
HTONS(ip->ip_len);
HTONS(ip->ip_off);
ip->ip_sum = 0;
ip->ip_sum = in_cksum(copym, hlen);
#if 1
if (dst->sin_family != AF_INET) {
printf("ip_mloopback: bad address family %d\n",
dst->sin_family);
dst->sin_family = AF_INET;
}
#endif
if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
if (ifp->if_hwassist) {
copym->m_pkthdr.csum_flags |=
CSUM_DATA_VALID | CSUM_PSEUDO_HDR |
CSUM_IP_CHECKED | CSUM_IP_VALID;
copym->m_pkthdr.csum_data = 0xffff;
} else {
NTOHS(ip->ip_len);
in_delayed_cksum(copym);
HTONS(ip->ip_len);
}
}
if (lo_dl_tag == 0)
dlil_find_dltag(APPLE_IF_FAM_LOOPBACK, 0, PF_INET, &lo_dl_tag);
if (lo_dl_tag) {
copym->m_pkthdr.rcvif = ifp;
dlil_output(lo_dl_tag, copym, 0, (struct sockaddr *) dst, 0);
} else {
printf("Warning: ip_output call to dlil_find_dltag failed!\n");
m_freem(copym);
}
}
}