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added a knob to enable path MTU discovery for multicast packets.

Browse source 
(by default, it is disabled)

Submitted by:	suz
Obtained from:	KAME
This commit is contained in:
Hajimu UMEMOTO 2005-08-13 19:55:06 +00:00
parent d24cff0fb0
commit 5af09736a8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=149033
4 changed files with 28 additions and 14 deletions
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6
sys/netinet6/in6.h
View file

@ -593,10 +593,14 @@ struct ip6_mtuinfo {
#define IPV6CTL_USE_DEFAULTZONE 39 /* use default scope zone */
#define IPV6CTL_MAXFRAGS 41 /* max fragments */
#if 0
#define IPV6CTL_IFQ 42 /* ip6intrq node */
#define IPV6CTL_ISATAPRTR 43 /* isatap router */
#endif
#define IPV6CTL_MCAST_PMTU 44 /* enable pMTU discovery for multicast? */
/* New entries should be added here from current IPV6CTL_MAXID value. */
/* to define items, should talk with KAME guys first, for *BSD compatibility */
/* 42-44 is already used in KAME */
#define IPV6CTL_STEALTH 45
#define IPV6CTL_MAXID 46
#endif /* __BSD_VISIBLE */

3
sys/netinet6/in6_proto.c
View file

@ -307,6 +307,7 @@ int ip6_gif_hlim = 0;
int ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */
int ip6_rr_prune = 5; /* router renumbering prefix
* walk list every 5 sec. */
int ip6_mcast_pmtu = 0; /* enable pMTU discovery for multicast? */
int ip6_v6only = 1;
int ip6_keepfaith = 0;
@ -450,6 +451,8 @@ SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEFAULTZONE,
use_defaultzone, CTLFLAG_RW, &ip6_use_defzone, 0,"");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGS,
maxfrags, CTLFLAG_RW, &ip6_maxfrags, 0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MCAST_PMTU,
mcast_pmtu, CTLFLAG_RW, &ip6_mcast_pmtu, 0, "");
#ifdef IPSTEALTH
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_STEALTH, stealth, CTLFLAG_RW,
&ip6stealth, 0, "");

32
sys/netinet6/ip6_mroute.c
View file

@ -106,6 +106,7 @@
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/icmp6.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
@ -1553,21 +1554,26 @@ phyint_send(ip6, mifp, m)
mifp - mif6table, error);
#endif
} else {
#ifdef MULTICAST_PMTUD
icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
#else
/*
* pMTU discovery is intentionally disabled by default, since
* various router may notify pMTU in multicast, which can be
* a DDoS to a router
*/
if (ip6_mcast_pmtu)
icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
else {
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_XMIT)
log(LOG_DEBUG,
"phyint_send: packet too big on %s o %s g %s"
" size %d(discarded)\n",
if_name(ifp),
ip6_sprintf(&ip6->ip6_src),
ip6_sprintf(&ip6->ip6_dst),
mb_copy->m_pkthdr.len);
if (mrt6debug & DEBUG_XMIT)
log(LOG_DEBUG,
"phyint_send: packet too big on %s o %s "
"g %s size %d(discarded)\n",
if_name(ifp),
ip6_sprintf(&ip6->ip6_src),
ip6_sprintf(&ip6->ip6_dst),
mb_copy->m_pkthdr.len);
#endif /* MRT6DEBUG */
m_freem(mb_copy); /* simply discard the packet */
#endif
m_freem(mb_copy); /* simply discard the packet */
}
}
splx(s);

1
sys/netinet6/ip6_var.h
View file

@ -295,6 +295,7 @@ extern int ip6_gif_hlim; /* Hop limit for gif encap packet */
extern int ip6_use_deprecated; /* allow deprecated addr as source */
extern int ip6_rr_prune; /* router renumbering prefix
* walk list every 5 sec. */
extern int ip6_mcast_pmtu; /* enable pMTU discovery for multicast? */
extern int ip6_v6only;
extern struct socket *ip6_mrouter; /* multicast routing daemon */