| version 1.34, 2001/02/07 08:59:48 |
version 1.35, 2001/02/10 04:14:28 |
|
|
| /* $NetBSD$ */ |
/* $NetBSD$ */ |
| /* $KAME: ip6_input.c,v 1.170 2001/02/07 07:50:02 itojun Exp $ */ |
/* $KAME: ip6_input.c,v 1.174 2001/02/09 06:17:41 jinmei Exp $ */ |
| |
|
| /* |
/* |
| * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
|
|
| #include <netinet6/nd6.h> |
#include <netinet6/nd6.h> |
| #include <netinet6/in6_prefix.h> |
#include <netinet6/in6_prefix.h> |
| |
|
| #ifdef IPV6FIREWALL |
|
| #include <netinet6/ip6_fw.h> |
|
| #endif |
|
| |
|
| #include <netinet6/ip6protosw.h> |
#include <netinet6/ip6protosw.h> |
| |
|
| /* we need it for NLOOP. */ |
/* we need it for NLOOP. */ |
| Line 134 int ip6_forward_srcrt; /* XXX */ |
|
| Line 130 int ip6_forward_srcrt; /* XXX */ |
|
| int ip6_sourcecheck; /* XXX */ |
int ip6_sourcecheck; /* XXX */ |
| int ip6_sourcecheck_interval; /* XXX */ |
int ip6_sourcecheck_interval; /* XXX */ |
| |
|
| #ifdef IPV6FIREWALL |
|
| /* firewall hooks */ |
|
| ip6_fw_chk_t *ip6_fw_chk_ptr; |
|
| ip6_fw_ctl_t *ip6_fw_ctl_ptr; |
|
| #endif |
|
| |
|
| #ifdef PFIL_HOOKS |
#ifdef PFIL_HOOKS |
| struct pfil_head inet6_pfil_hook; |
struct pfil_head inet6_pfil_hook; |
| #endif |
#endif |
| Line 157 static int ip6_hopopts_input __P((u_int3 |
|
| Line 147 static int ip6_hopopts_input __P((u_int3 |
|
| void |
void |
| ip6_init() |
ip6_init() |
| { |
{ |
| register struct ip6protosw *pr; |
struct ip6protosw *pr; |
| register int i; |
int i; |
| struct timeval tv; |
struct timeval tv; |
| |
|
| pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); |
pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); |
|
|
| ip6intrq.ifq_maxlen = ip6qmaxlen; |
ip6intrq.ifq_maxlen = ip6qmaxlen; |
| nd6_init(); |
nd6_init(); |
| frag6_init(); |
frag6_init(); |
| #ifdef IPV6FIREWALL |
|
| ip6_fw_init(); |
|
| #endif |
|
| /* |
/* |
| * in many cases, random() here does NOT return random number |
* in many cases, random() here does NOT return random number |
| * as initialization during bootstrap time occur in fixed order. |
* as initialization during bootstrap time occur in fixed order. |
|
|
| |
|
| ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; |
ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; |
| |
|
| #ifdef IPV6FIREWALL |
|
| /* |
|
| * Check with the firewall... |
|
| */ |
|
| if (ip6_fw_chk_ptr) { |
|
| u_short port = 0; |
|
| /* If ipfw says divert, we have to just drop packet */ |
|
| /* use port as a dummy argument */ |
|
| if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) { |
|
| m_freem(m); |
|
| m = NULL; |
|
| } |
|
| if (!m) |
|
| return; |
|
| } |
|
| #endif |
|
| |
|
| #ifdef ALTQ |
#ifdef ALTQ |
| /* XXX Temporary until ALTQ is changed to use a pfil hook */ |
/* XXX Temporary until ALTQ is changed to use a pfil hook */ |
| if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { |
if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { |
|
|
| * may be able to use IPv4 mapped addr to confuse tcp/udp stack and |
* may be able to use IPv4 mapped addr to confuse tcp/udp stack and |
| * bypass security checks (act as if it was from 127.0.0.1 by using |
* bypass security checks (act as if it was from 127.0.0.1 by using |
| * IPv6 src ::ffff:127.0.0.1). Be cautious. |
* IPv6 src ::ffff:127.0.0.1). Be cautious. |
| |
* |
| |
* This check chokes if we are in SIIT cloud. As none of BSDs support |
| |
* IPv4-less kernel compilation, we cannot support SIIT environment |
| |
* at all. So, it makes more sense for us to reject any malicious |
| |
* packets for non-SIIT environment, than try to do a partical support |
| |
* for SIIT environment. |
| */ |
*/ |
| if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || |
if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || |
| IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { |
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { |
|
|
| goto bad; |
goto bad; |
| } |
} |
| #endif |
#endif |
| |
|
| if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) || |
if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) || |
| IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) { |
IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) { |
| if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { |
if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { |
|
|
| if (ip6_forward_rt.ro_rt != NULL && |
if (ip6_forward_rt.ro_rt != NULL && |
| (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 && |
(ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 && |
| IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, |
IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, |
| &ip6_forward_rt.ro_dst.sin6_addr)) |
&((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr)) |
| ip6stat.ip6s_forward_cachehit++; |
ip6stat.ip6s_forward_cachehit++; |
| else { |
else { |
| |
struct sockaddr_in6 *dst6; |
| |
|
| if (ip6_forward_rt.ro_rt) { |
if (ip6_forward_rt.ro_rt) { |
| /* route is down or destination is different */ |
/* route is down or destination is different */ |
| ip6stat.ip6s_forward_cachemiss++; |
ip6stat.ip6s_forward_cachemiss++; |
|
|
| } |
} |
| |
|
| bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6)); |
bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6)); |
| ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6); |
dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst; |
| ip6_forward_rt.ro_dst.sin6_family = AF_INET6; |
dst6->sin6_len = sizeof(struct sockaddr_in6); |
| ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst; |
dst6->sin6_family = AF_INET6; |
| |
dst6->sin6_addr = ip6->ip6_dst; |
| |
|
| rtalloc((struct route *)&ip6_forward_rt); |
rtalloc((struct route *)&ip6_forward_rt); |
| } |
} |
| Line 742 ip6_hopopts_input(plenp, rtalertp, mp, o |
|
| Line 722 ip6_hopopts_input(plenp, rtalertp, mp, o |
|
| struct mbuf **mp; |
struct mbuf **mp; |
| int *offp; |
int *offp; |
| { |
{ |
| register struct mbuf *m = *mp; |
struct mbuf *m = *mp; |
| int off = *offp, hbhlen; |
int off = *offp, hbhlen; |
| struct ip6_hbh *hbh; |
struct ip6_hbh *hbh; |
| u_int8_t *opt; |
u_int8_t *opt; |
| Line 804 ip6_process_hopopts(m, opthead, hbhlen, |
|
| Line 784 ip6_process_hopopts(m, opthead, hbhlen, |
|
| u_int32_t jumboplen; |
u_int32_t jumboplen; |
| |
|
| for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { |
for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { |
| switch(*opt) { |
switch (*opt) { |
| case IP6OPT_PAD1: |
case IP6OPT_PAD1: |
| optlen = 1; |
optlen = 1; |
| break; |
break; |
| case IP6OPT_PADN: |
case IP6OPT_PADN: |
| if (hbhlen < IP6OPT_MINLEN) { |
if (hbhlen < IP6OPT_MINLEN) { |
| ip6stat.ip6s_toosmall++; |
ip6stat.ip6s_toosmall++; |
| goto bad; |
goto bad; |
| } |
} |
| optlen = *(opt + 1) + 2; |
optlen = *(opt + 1) + 2; |
| break; |
break; |
| case IP6OPT_RTALERT: |
case IP6OPT_RTALERT: |
| /* XXX may need check for alignment */ |
|
| if (hbhlen < IP6OPT_RTALERT_LEN) { |
|
| ip6stat.ip6s_toosmall++; |
|
| goto bad; |
|
| } |
|
| if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) |
|
| /* XXX: should we discard the packet? */ |
|
| log(LOG_ERR, "length of router alert opt is inconsitent(%d)", |
|
| *(opt + 1)); |
|
| optlen = IP6OPT_RTALERT_LEN; |
|
| bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); |
|
| *rtalertp = ntohs(rtalert_val); |
|
| break; |
|
| case IP6OPT_JUMBO: |
|
| /* XXX may need check for alignment */ |
/* XXX may need check for alignment */ |
| if (hbhlen < IP6OPT_JUMBO_LEN) { |
if (hbhlen < IP6OPT_RTALERT_LEN) { |
| ip6stat.ip6s_toosmall++; |
ip6stat.ip6s_toosmall++; |
| goto bad; |
goto bad; |
| } |
} |
| if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) |
if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { |
| /* XXX: should we discard the packet? */ |
/* XXX: should we discard the packet? */ |
| |
log(LOG_ERR, "length of router alert opt is inconsitent(%d)", |
| |
*(opt + 1)); |
| |
} |
| |
optlen = IP6OPT_RTALERT_LEN; |
| |
bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); |
| |
*rtalertp = ntohs(rtalert_val); |
| |
break; |
| |
case IP6OPT_JUMBO: |
| |
/* XXX may need check for alignment */ |
| |
if (hbhlen < IP6OPT_JUMBO_LEN) { |
| |
ip6stat.ip6s_toosmall++; |
| |
goto bad; |
| |
} |
| |
if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { |
| |
/* XXX: should we discard the packet? */ |
| log(LOG_ERR, "length of jumbopayload opt " |
log(LOG_ERR, "length of jumbopayload opt " |
| "is inconsistent(%d)\n", |
"is inconsistent(%d)\n", |
| *(opt + 1)); |
*(opt + 1)); |
| |
} |
| optlen = IP6OPT_JUMBO_LEN; |
optlen = IP6OPT_JUMBO_LEN; |
| |
|
| /* |
/* |
| * IPv6 packets that have non 0 payload length |
* IPv6 packets that have non 0 payload length |
| * must not contain a jumbo paylod option. |
* must not contain a jumbo payload option. |
| */ |
*/ |
| ip6 = mtod(m, struct ip6_hdr *); |
ip6 = mtod(m, struct ip6_hdr *); |
| if (ip6->ip6_plen) { |
if (ip6->ip6_plen) { |
| Line 899 ip6_process_hopopts(m, opthead, hbhlen, |
|
| Line 881 ip6_process_hopopts(m, opthead, hbhlen, |
|
| *plenp = jumboplen; |
*plenp = jumboplen; |
| |
|
| break; |
break; |
| default: /* unknown option */ |
default: /* unknown option */ |
| if (hbhlen < IP6OPT_MINLEN) { |
if (hbhlen < IP6OPT_MINLEN) { |
| ip6stat.ip6s_toosmall++; |
ip6stat.ip6s_toosmall++; |
| goto bad; |
goto bad; |
| } |
} |
| if ((optlen = ip6_unknown_opt(opt, m, |
if ((optlen = ip6_unknown_opt(opt, m, |
| sizeof(struct ip6_hdr) + |
sizeof(struct ip6_hdr) + |
| sizeof(struct ip6_hbh) + |
sizeof(struct ip6_hbh) + |
| opt - opthead)) == -1) |
opt - opthead)) == -1) |
| return(-1); |
return(-1); |
| optlen += 2; |
optlen += 2; |
| break; |
break; |
| } |
} |
| } |
} |
| |
|
| Line 935 ip6_unknown_opt(optp, m, off) |
|
| Line 917 ip6_unknown_opt(optp, m, off) |
|
| { |
{ |
| struct ip6_hdr *ip6; |
struct ip6_hdr *ip6; |
| |
|
| switch(IP6OPT_TYPE(*optp)) { |
switch (IP6OPT_TYPE(*optp)) { |
| case IP6OPT_TYPE_SKIP: /* ignore the option */ |
case IP6OPT_TYPE_SKIP: /* ignore the option */ |
| return((int)*(optp + 1)); |
return((int)*(optp + 1)); |
| case IP6OPT_TYPE_DISCARD: /* silently discard */ |
case IP6OPT_TYPE_DISCARD: /* silently discard */ |
| m_freem(m); |
m_freem(m); |
| return(-1); |
return(-1); |
| case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ |
case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ |
| ip6stat.ip6s_badoptions++; |
ip6stat.ip6s_badoptions++; |
| icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); |
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); |
| return(-1); |
return(-1); |
| case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ |
case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ |
| ip6stat.ip6s_badoptions++; |
ip6stat.ip6s_badoptions++; |
| ip6 = mtod(m, struct ip6_hdr *); |
ip6 = mtod(m, struct ip6_hdr *); |
| if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || |
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || |
| (m->m_flags & (M_BCAST|M_MCAST))) |
(m->m_flags & (M_BCAST|M_MCAST))) |
| m_freem(m); |
m_freem(m); |
| else |
else |
| icmp6_error(m, ICMP6_PARAM_PROB, |
icmp6_error(m, ICMP6_PARAM_PROB, |
| ICMP6_PARAMPROB_OPTION, off); |
ICMP6_PARAMPROB_OPTION, off); |
| return(-1); |
return(-1); |
| } |
} |
| |
|
| m_freem(m); /* XXX: NOTREACHED */ |
m_freem(m); /* XXX: NOTREACHED */ |
| Line 974 ip6_unknown_opt(optp, m, off) |
|
| Line 956 ip6_unknown_opt(optp, m, off) |
|
| */ |
*/ |
| void |
void |
| ip6_savecontrol(in6p, mp, ip6, m) |
ip6_savecontrol(in6p, mp, ip6, m) |
| register struct in6pcb *in6p; |
struct in6pcb *in6p; |
| register struct mbuf **mp; |
struct mbuf **mp; |
| register struct ip6_hdr *ip6; |
struct ip6_hdr *ip6; |
| register struct mbuf *m; |
struct mbuf *m; |
| { |
{ |
| struct proc *p = curproc; /* XXX */ |
struct proc *p = curproc; /* XXX */ |
| int privileged; |
int privileged; |
| Line 1015 ip6_savecontrol(in6p, mp, ip6, m) |
|
| Line 997 ip6_savecontrol(in6p, mp, ip6, m) |
|
| #endif |
#endif |
| |
|
| /* RFC 2292 sec. 5 */ |
/* RFC 2292 sec. 5 */ |
| if (in6p->in6p_flags & IN6P_PKTINFO) { |
if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { |
| struct in6_pktinfo pi6; |
struct in6_pktinfo pi6; |
| bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); |
bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); |
| if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr)) |
if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr)) |
| Line 1044 ip6_savecontrol(in6p, mp, ip6, m) |
|
| Line 1026 ip6_savecontrol(in6p, mp, ip6, m) |
|
| * be some hop-by-hop options which can be returned to normal user. |
* be some hop-by-hop options which can be returned to normal user. |
| * See RFC 2292 section 6. |
* See RFC 2292 section 6. |
| */ |
*/ |
| if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) { |
if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) { |
| /* |
/* |
| * Check if a hop-by-hop options header is contatined in the |
* Check if a hop-by-hop options header is contatined in the |
| * received packet, and if so, store the options as ancillary |
* received packet, and if so, store the options as ancillary |
| Line 1101 ip6_savecontrol(in6p, mp, ip6, m) |
|
| Line 1083 ip6_savecontrol(in6p, mp, ip6, m) |
|
| * Note that the order of the headers remains in |
* Note that the order of the headers remains in |
| * the chain of ancillary data. |
* the chain of ancillary data. |
| */ |
*/ |
| while(1) { /* is explicit loop prevention necessary? */ |
while (1) { /* is explicit loop prevention necessary? */ |
| struct ip6_ext *ip6e; |
struct ip6_ext *ip6e; |
| int elen; |
int elen; |
| |
|
| Line 1129 ip6_savecontrol(in6p, mp, ip6, m) |
|
| Line 1111 ip6_savecontrol(in6p, mp, ip6, m) |
|
| } |
} |
| #endif |
#endif |
| |
|
| switch(nxt) { |
switch (nxt) { |
| case IPPROTO_DSTOPTS: |
case IPPROTO_DSTOPTS: |
| if (!in6p->in6p_flags & IN6P_DSTOPTS) |
if (!in6p->in6p_flags & IN6P_DSTOPTS) |
| break; |
break; |
| |
|
| /* |
/* |
| * We also require super-user privilege for |
* We also require super-user privilege for |
| * the option. |
* the option. |
| * See the comments on IN6_HOPOPTS. |
* See the comments on IN6_HOPOPTS. |
| */ |
*/ |
| if (!privileged) |
if (!privileged) |
| break; |
break; |
| |
|
| *mp = sbcreatecontrol((caddr_t)ip6e, elen, |
*mp = sbcreatecontrol((caddr_t)ip6e, elen, |
| IPV6_DSTOPTS, |
IPV6_DSTOPTS, |
| IPPROTO_IPV6); |
IPPROTO_IPV6); |
| if (*mp) |
if (*mp) |
| mp = &(*mp)->m_next; |
mp = &(*mp)->m_next; |
| break; |
break; |
| |
|
| case IPPROTO_ROUTING: |
case IPPROTO_ROUTING: |
| if (!in6p->in6p_flags & IN6P_RTHDR) |
if (!in6p->in6p_flags & IN6P_RTHDR) |
| break; |
break; |
| |
|
| *mp = sbcreatecontrol((caddr_t)ip6e, elen, |
*mp = sbcreatecontrol((caddr_t)ip6e, elen, |
| IPV6_RTHDR, |
IPV6_RTHDR, |
| IPPROTO_IPV6); |
IPPROTO_IPV6); |
| if (*mp) |
if (*mp) |
| mp = &(*mp)->m_next; |
mp = &(*mp)->m_next; |
| break; |
break; |
| |
|
| case IPPROTO_UDP: |
case IPPROTO_UDP: |
| case IPPROTO_TCP: |
case IPPROTO_TCP: |
| case IPPROTO_ICMPV6: |
case IPPROTO_ICMPV6: |
| default: |
default: |
| /* |
/* |
| * stop search if we encounter an upper |
* stop search if we encounter an upper |
| * layer protocol headers. |
* layer protocol headers. |
| */ |
*/ |
| goto loopend; |
goto loopend; |
| |
|
| case IPPROTO_HOPOPTS: |
case IPPROTO_HOPOPTS: |
| case IPPROTO_AH: /* is it possible? */ |
case IPPROTO_AH: /* is it possible? */ |
| break; |
break; |
| } |
} |
| |
|
| /* proceed with the next header. */ |
/* proceed with the next header. */ |
| Line 1221 ip6_get_prevhdr(m, off) |
|
| Line 1203 ip6_get_prevhdr(m, off) |
|
| while (len < off) { |
while (len < off) { |
| ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); |
ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); |
| |
|
| switch(nxt) { |
switch (nxt) { |
| case IPPROTO_FRAGMENT: |
case IPPROTO_FRAGMENT: |
| len += sizeof(struct ip6_frag); |
len += sizeof(struct ip6_frag); |
| break; |
break; |