raw_ip6.c

来自「eCos操作系统源码」· C语言 代码 · 共 715 行 · 第 1/2 页

				  in6p->in6p_moptions,
				  &in6p->in6p_route,
				  &oifp, &in6p->in6p_laddr,
				  &error)) == 0) {
		if (error == 0)
			error = EADDRNOTAVAIL;
		goto bad;
	}
	ip6->ip6_src = *in6a;

	if (oifp && dstsock->sin6_scope_id == 0 &&
	    (error = scope6_setzoneid(oifp, dstsock)) != 0) { /* XXX */
		goto bad;
	}
	if (oifp == NULL && in6p->in6p_route.ro_rt)
		oifp = ifindex2ifnet[in6p->in6p_route.ro_rt->rt_ifp->if_index];

	/* fill in the rest of the IPv6 header fields */
	ip6->ip6_dst = *dst;
	ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
		(in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK);
	ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
		(IPV6_VERSION & IPV6_VERSION_MASK);
	/* ip6_plen will be filled in ip6_output, so not fill it here. */
	ip6->ip6_nxt = in6p->in6p_ip6_nxt;
	ip6->ip6_hlim = in6_selecthlim(in6p, oifp);

	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
	    in6p->in6p_cksum != -1) {
		struct mbuf *n;
		int off;
		u_int16_t *p;

		/* compute checksum */
		if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
			off = offsetof(struct icmp6_hdr, icmp6_cksum);
		else
			off = in6p->in6p_cksum;
		if (plen < off + 1) {
			error = EINVAL;
			goto bad;
		}
		off += sizeof(struct ip6_hdr);

		n = m;
		while (n && n->m_len <= off) {
			off -= n->m_len;
			n = n->m_next;
		}
		if (!n)
			goto bad;
		p = (u_int16_t *)(mtod(n, caddr_t) + off);
		*p = 0;
		*p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
	}

#ifdef IPSEC
	if (ipsec_setsocket(m, so) != 0) {
		error = ENOBUFS;
		goto bad;
	}
#endif /*IPSEC*/

	oifp = NULL;		/* just in case */
	error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route, 0,
			   in6p->in6p_moptions, &oifp);
	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
		if (oifp)
			icmp6_ifoutstat_inc(oifp, type, code);
		icmp6stat.icp6s_outhist[type]++;
	} else
		rip6stat.rip6s_opackets++;

	goto freectl;

 bad:
	if (m)
		m_freem(m);

 freectl:
	if (control) {
		ip6_clearpktopts(in6p->in6p_outputopts, -1);
		in6p->in6p_outputopts = stickyopt;
		m_freem(control);
	}
	return(error);
}

/*
 * Raw IPv6 socket option processing.
 */
int
rip6_ctloutput(so, sopt)
	struct socket *so;
	struct sockopt *sopt;
{
	int error;

	if (sopt->sopt_level == IPPROTO_ICMPV6)
		/*
		 * XXX: is it better to call icmp6_ctloutput() directly
		 * from protosw?
		 */
		return(icmp6_ctloutput(so, sopt));
	else if (sopt->sopt_level != IPPROTO_IPV6)
		return (EINVAL);

	error = 0;

	switch (sopt->sopt_dir) {
	case SOPT_GET:
		switch (sopt->sopt_name) {
		case MRT6_INIT:
		case MRT6_DONE:
		case MRT6_ADD_MIF:
		case MRT6_DEL_MIF:
		case MRT6_ADD_MFC:
		case MRT6_DEL_MFC:
		case MRT6_PIM:
			error = ip6_mrouter_get(so, sopt);
			break;
		case IPV6_CHECKSUM:
			error = ip6_raw_ctloutput(so, sopt);
			break;
		default:
			error = ip6_ctloutput(so, sopt);
			break;
		}
		break;

	case SOPT_SET:
		switch (sopt->sopt_name) {
		case MRT6_INIT:
		case MRT6_DONE:
		case MRT6_ADD_MIF:
		case MRT6_DEL_MIF:
		case MRT6_ADD_MFC:
		case MRT6_DEL_MFC:
		case MRT6_PIM:
			error = ip6_mrouter_set(so, sopt);
			break;
		case IPV6_CHECKSUM:
			error = ip6_raw_ctloutput(so, sopt);
			break;
		default:
			error = ip6_ctloutput(so, sopt);
			break;
		}
		break;
	}

	return (error);
}

static int
rip6_attach(struct socket *so, int proto, struct proc *p)
{
	struct inpcb *inp;
	int error, s;

	inp = sotoinpcb(so);
	if (inp)
		panic("rip6_attach");

	error = soreserve(so, rip_sendspace, rip_recvspace);
	if (error)
		return error;
	s = splnet();
	error = in_pcballoc(so, &ripcbinfo, p);
	splx(s);
	if (error)
		return error;
	inp = (struct inpcb *)so->so_pcb;
	inp->inp_vflag |= INP_IPV6;
	inp->in6p_ip6_nxt = (long)proto;
	inp->in6p_hops = -1;	/* use kernel default */
	inp->in6p_cksum = -1;
	MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *,
	       sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
	ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
	return 0;
}

static int
rip6_detach(struct socket *so)
{
	struct inpcb *inp;

	inp = sotoinpcb(so);
	if (inp == 0)
		panic("rip6_detach");
	/* xxx: RSVP */
	if (so == ip6_mrouter)
		ip6_mrouter_done();
	if (inp->in6p_icmp6filt) {
		FREE(inp->in6p_icmp6filt, M_PCB);
		inp->in6p_icmp6filt = NULL;
	}
	in6_pcbdetach(inp);
	return 0;
}

static int
rip6_abort(struct socket *so)
{
	soisdisconnected(so);
	return rip6_detach(so);
}

static int
rip6_disconnect(struct socket *so)
{
	struct inpcb *inp = sotoinpcb(so);

	if ((so->so_state & SS_ISCONNECTED) == 0)
		return ENOTCONN;
	inp->in6p_faddr = in6addr_any;
	return rip6_abort(so);
}

static int
rip6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
{
	struct inpcb *inp = sotoinpcb(so);
	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
	struct ifaddr *ia = NULL;
	int error = 0;

	if (nam->sa_len != sizeof(*addr))
		return EINVAL;
	if (nam->sa_family != AF_INET6)
		return EAFNOSUPPORT;
	if (TAILQ_EMPTY(&ifnet) || addr->sin6_family != AF_INET6)
		return EADDRNOTAVAIL;
	if ((error = scope6_check_id(addr, ip6_use_defzone)) != 0)
		return(error);
#ifndef SCOPEDROUTING
	addr->sin6_scope_id = 0; /* for ifa_ifwithaddr */
#endif

	if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
	    (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == 0)
		return EADDRNOTAVAIL;
	if (ia &&
	    ((struct in6_ifaddr *)ia)->ia6_flags &
	    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
	     IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
		return(EADDRNOTAVAIL);
	}
	inp->in6p_laddr = addr->sin6_addr;
	return 0;
}

static int
rip6_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
{
	struct inpcb *inp = sotoinpcb(so);
	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
	struct in6_addr *in6a = NULL;
	struct ifnet *ifp = NULL;
	int error = 0;

	if (nam->sa_len != sizeof(*addr))
		return EINVAL;
	if (TAILQ_EMPTY(&ifnet))
		return EADDRNOTAVAIL;
	if (addr->sin6_family != AF_INET6)
		return EAFNOSUPPORT;
	if ((error = scope6_check_id(addr, ip6_use_defzone)) != 0)
		return(error);

	/* Source address selection. XXX: need pcblookup? */
	in6a = in6_selectsrc(addr, inp->in6p_outputopts,
			     inp->in6p_moptions, &inp->in6p_route,
			     &ifp, &inp->in6p_laddr, &error);
	if (in6a == NULL)
		return (error ? error : EADDRNOTAVAIL);

	/* see above */
	if (ifp && addr->sin6_scope_id == 0 &&
	    (error = scope6_setzoneid(ifp, addr)) != 0) { /* XXX */
		return(error);
	}
	inp->in6p_laddr = *in6a;
	inp->in6p_faddr = addr->sin6_addr;
	soisconnected(so);
	return 0;
}

static int
rip6_shutdown(struct socket *so)
{
	socantsendmore(so);
	return 0;
}

static int
rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
	 struct mbuf *control, struct proc *p)
{
	int error = 0;
	struct inpcb *inp = sotoinpcb(so);
	struct sockaddr_in6 tmp;
	struct sockaddr_in6 *dst;

	/* always copy sockaddr to avoid overwrites */
	if (so->so_state & SS_ISCONNECTED) {
		if (nam) {
			m_freem(m);
			return EISCONN;
		}
		/* XXX */
		bzero(&tmp, sizeof(tmp));
		tmp.sin6_family = AF_INET6;
		tmp.sin6_len = sizeof(struct sockaddr_in6);
		bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
		      sizeof(struct in6_addr));
		dst = &tmp;
	} else {
		if (nam == NULL) {
			m_freem(m);
			return ENOTCONN;
		}
		if (nam->sa_len != sizeof(struct sockaddr_in6)) {
			m_freem(m);
			return(EINVAL);
		}
		tmp = *(struct sockaddr_in6 *)nam;
		dst = &tmp;
		if (dst->sin6_family == AF_UNSPEC) {
			/*
			 * XXX: we allow this case for backward
			 * compatibility to buggy applications that
			 * rely on old (and wrong) kernel behavior.
			 */
			log(LOG_INFO, "rip6 SEND: address family is "
			    "unspec. Assume AF_INET6\n");
		} else if (dst->sin6_family != AF_INET6) {
			m_freem(m);
			return(EAFNOSUPPORT);
		}
		if ((error = scope6_check_id(dst, ip6_use_defzone)) != 0) {
			m_freem(m);
			return(error);
		}
	}
	return rip6_output(m, so, dst, control);
}

struct pr_usrreqs rip6_usrreqs = {
	rip6_abort, pru_accept_notsupp, rip6_attach, rip6_bind, rip6_connect,
	pru_connect2_notsupp, in6_control, rip6_detach, rip6_disconnect,
	pru_listen_notsupp, in6_setpeeraddr, pru_rcvd_notsupp,
	pru_rcvoob_notsupp, rip6_send, pru_sense_null, rip6_shutdown,
	in6_setsockaddr, sosend, soreceive, sopoll
};