diff options
Diffstat (limited to 'freebsd/sys/netinet6/ip6_input.c')
| -rw-r--r-- | freebsd/sys/netinet6/ip6_input.c | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/freebsd/sys/netinet6/ip6_input.c b/freebsd/sys/netinet6/ip6_input.c index 0de64eb7..17420faf 100644 --- a/freebsd/sys/netinet6/ip6_input.c +++ b/freebsd/sys/netinet6/ip6_input.c @@ -1605,24 +1605,28 @@ ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) #undef IS2292 void -ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu) +ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu) { struct socket *so; struct mbuf *m_mtu; struct ip6_mtuinfo mtuctl; - so = in6p->inp_socket; - - if (mtu == NULL) + KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); + /* + * Notify the error by sending IPV6_PATHMTU ancillary data if + * application wanted to know the MTU value. + * NOTE: we notify disconnected sockets, because some udp + * applications keep sending sockets disconnected. + * NOTE: our implementation doesn't notify connected sockets that has + * foreign address that is different than given destination addresses + * (this is permitted by RFC 3542). + */ + if ((inp->inp_flags & IN6P_MTU) == 0 || ( + !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && + !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr))) return; -#ifdef DIAGNOSTIC - if (so == NULL) /* I believe this is impossible */ - panic("ip6_notify_pmtu: socket is NULL"); -#endif - - bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */ - mtuctl.ip6m_mtu = *mtu; + mtuctl.ip6m_mtu = mtu; mtuctl.ip6m_addr = *dst; if (sa6_recoverscope(&mtuctl.ip6m_addr)) return; @@ -1631,14 +1635,13 @@ ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu) IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) return; + so = inp->inp_socket; if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) == 0) { m_freem(m_mtu); /* XXX: should count statistics */ } else sorwakeup(so); - - return; } #ifdef PULLDOWN_TEST |