freebsd-skq/sys/netinet/raw_ip.c

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/*
* Copyright (c) 1982, 1986, 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)raw_ip.c 8.7 (Berkeley) 5/15/95
1999-08-28 01:08:13 +00:00
* $FreeBSD$
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*/
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_random_ip_id.h"
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#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
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#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/proc.h>
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#include <sys/protosw.h>
#include <sys/socket.h>
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#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <vm/uma.h>
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#include <net/if.h>
#include <net/route.h>
#define _IP_VHL
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#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
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#include <netinet/ip_var.h>
#include <netinet/ip_mroute.h>
#include <netinet/ip_fw.h>
#include <netinet/ip_dummynet.h>
#ifdef IPSEC
#include <netinet6/ipsec.h>
#endif /*IPSEC*/
struct inpcbhead ripcb;
struct inpcbinfo ripcbinfo;
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/* control hooks for ipfw and dummynet */
ip_fw_ctl_t *ip_fw_ctl_ptr;
ip_dn_ctl_t *ip_dn_ctl_ptr;
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/*
* Nominal space allocated to a raw ip socket.
*/
#define RIPSNDQ 8192
#define RIPRCVQ 8192
/*
* Raw interface to IP protocol.
*/
/*
* Initialize raw connection block q.
*/
void
rip_init()
{
LIST_INIT(&ripcb);
ripcbinfo.listhead = &ripcb;
/*
* XXX We don't use the hash list for raw IP, but it's easier
* to allocate a one entry hash list than it is to check all
* over the place for hashbase == NULL.
*/
ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask);
Improved connection establishment performance by doing local port lookups via a hashed port list. In the new scheme, in_pcblookup() goes away and is replaced by a new routine, in_pcblookup_local() for doing the local port check. Note that this implementation is space inefficient in that the PCB struct is now too large to fit into 128 bytes. I might deal with this in the future by using the new zone allocator, but I wanted these changes to be extensively tested in their current form first. Also: 1) Fixed off-by-one errors in the port lookup loops in in_pcbbind(). 2) Got rid of some unneeded rehashing. Adding a new routine, in_pcbinshash() to do the initialial hash insertion. 3) Renamed in_pcblookuphash() to in_pcblookup_hash() for easier readability. 4) Added a new routine, in_pcbremlists() to remove the PCB from the various hash lists. 5) Added/deleted comments where appropriate. 6) Removed unnecessary splnet() locking. In general, the PCB functions should be called at splnet()...there are unfortunately a few exceptions, however. 7) Reorganized a few structs for better cache line behavior. 8) Killed my TCP_ACK_HACK kludge. It may come back in a different form in the future, however. These changes have been tested on wcarchive for more than a month. In tests done here, connection establishment overhead is reduced by more than 50 times, thus getting rid of one of the major networking scalability problems. Still to do: make tcp_fastimo/tcp_slowtimo scale well for systems with a large number of connections. tcp_fastimo is easy; tcp_slowtimo is difficult. WARNING: Anything that knows about inpcb and tcpcb structs will have to be recompiled; at the very least, this includes netstat(1).
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ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask);
ripcbinfo.ipi_zone = uma_zcreate("ripcb", sizeof(struct inpcb),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
uma_zone_set_max(ripcbinfo.ipi_zone, maxsockets);
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}
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static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
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/*
* Setup generic address and protocol structures
* for raw_input routine, then pass them along with
* mbuf chain.
*/
void
rip_input(m, off)
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struct mbuf *m;
int off;
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{
register struct ip *ip = mtod(m, struct ip *);
register struct inpcb *inp;
struct inpcb *last = 0;
struct mbuf *opts = 0;
int proto = ip->ip_p;
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ripsrc.sin_addr = ip->ip_src;
LIST_FOREACH(inp, &ripcb, inp_list) {
#ifdef INET6
if ((inp->inp_vflag & INP_IPV4) == 0)
continue;
#endif
if (inp->inp_ip_p && inp->inp_ip_p != proto)
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continue;
if (inp->inp_laddr.s_addr &&
inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
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continue;
if (inp->inp_faddr.s_addr &&
inp->inp_faddr.s_addr != ip->ip_src.s_addr)
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continue;
if (last) {
struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
#ifdef IPSEC
/* check AH/ESP integrity. */
if (n && ipsec4_in_reject_so(n, last->inp_socket)) {
m_freem(n);
ipsecstat.in_polvio++;
/* do not inject data to pcb */
} else
#endif /*IPSEC*/
if (n) {
if (last->inp_flags & INP_CONTROLOPTS ||
last->inp_socket->so_options & SO_TIMESTAMP)
ip_savecontrol(last, &opts, ip, n);
if (sbappendaddr(&last->inp_socket->so_rcv,
(struct sockaddr *)&ripsrc, n,
opts) == 0) {
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/* should notify about lost packet */
m_freem(n);
if (opts)
m_freem(opts);
} else
sorwakeup(last->inp_socket);
opts = 0;
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}
}
last = inp;
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}
#ifdef IPSEC
/* check AH/ESP integrity. */
if (last && ipsec4_in_reject_so(m, last->inp_socket)) {
m_freem(m);
ipsecstat.in_polvio++;
ipstat.ips_delivered--;
/* do not inject data to pcb */
} else
#endif /*IPSEC*/
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if (last) {
if (last->inp_flags & INP_CONTROLOPTS ||
last->inp_socket->so_options & SO_TIMESTAMP)
ip_savecontrol(last, &opts, ip, m);
if (sbappendaddr(&last->inp_socket->so_rcv,
(struct sockaddr *)&ripsrc, m, opts) == 0) {
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m_freem(m);
if (opts)
m_freem(opts);
} else
sorwakeup(last->inp_socket);
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} else {
m_freem(m);
ipstat.ips_noproto++;
ipstat.ips_delivered--;
}
}
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/*
* Generate IP header and pass packet to ip_output.
* Tack on options user may have setup with control call.
*/
int
rip_output(m, so, dst)
struct mbuf *m;
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struct socket *so;
u_long dst;
{
register struct ip *ip;
register struct inpcb *inp = sotoinpcb(so);
int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
/*
* If the user handed us a complete IP packet, use it.
* Otherwise, allocate an mbuf for a header and fill it in.
*/
if ((inp->inp_flags & INP_HDRINCL) == 0) {
if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
m_freem(m);
return(EMSGSIZE);
}
M_PREPEND(m, sizeof(struct ip), M_TRYWAIT);
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ip = mtod(m, struct ip *);
ip->ip_tos = inp->inp_ip_tos;
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ip->ip_off = 0;
ip->ip_p = inp->inp_ip_p;
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ip->ip_len = m->m_pkthdr.len;
ip->ip_src = inp->inp_laddr;
ip->ip_dst.s_addr = dst;
ip->ip_ttl = inp->inp_ip_ttl;
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} else {
if (m->m_pkthdr.len > IP_MAXPACKET) {
m_freem(m);
return(EMSGSIZE);
}
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ip = mtod(m, struct ip *);
/* don't allow both user specified and setsockopt options,
and don't allow packet length sizes that will crash */
if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2))
&& inp->inp_options)
|| (ip->ip_len > m->m_pkthdr.len)
|| (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) {
m_freem(m);
return EINVAL;
}
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if (ip->ip_id == 0)
#ifdef RANDOM_IP_ID
ip->ip_id = ip_randomid();
#else
ip->ip_id = htons(ip_id++);
#endif
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/* XXX prevent ip_output from overwriting header fields */
flags |= IP_RAWOUTPUT;
ipstat.ips_rawout++;
}
#ifdef IPSEC
if (ipsec_setsocket(m, so) != 0) {
m_freem(m);
return ENOBUFS;
}
#endif /*IPSEC*/
return (ip_output(m, inp->inp_options, &inp->inp_route, flags,
inp->inp_moptions));
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}
/*
* Raw IP socket option processing.
*/
int
rip_ctloutput(so, sopt)
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struct socket *so;
struct sockopt *sopt;
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{
struct inpcb *inp = sotoinpcb(so);
int error, optval;
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if (sopt->sopt_level != IPPROTO_IP)
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return (EINVAL);
error = 0;
switch (sopt->sopt_dir) {
case SOPT_GET:
switch (sopt->sopt_name) {
case IP_HDRINCL:
optval = inp->inp_flags & INP_HDRINCL;
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case IP_FW_ADD: /* ADD actually returns the body... */
case IP_FW_GET:
if (IPFW_LOADED)
error = ip_fw_ctl_ptr(sopt);
else
error = ENOPROTOOPT;
break;
case IP_DUMMYNET_GET:
if (DUMMYNET_LOADED)
error = ip_dn_ctl_ptr(sopt);
else
error = ENOPROTOOPT;
break ;
case MRT_INIT:
case MRT_DONE:
case MRT_ADD_VIF:
case MRT_DEL_VIF:
case MRT_ADD_MFC:
case MRT_DEL_MFC:
case MRT_VERSION:
case MRT_ASSERT:
error = ip_mrouter_get(so, sopt);
break;
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default:
error = ip_ctloutput(so, sopt);
break;
}
break;
case SOPT_SET:
switch (sopt->sopt_name) {
case IP_HDRINCL:
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
break;
if (optval)
inp->inp_flags |= INP_HDRINCL;
else
inp->inp_flags &= ~INP_HDRINCL;
break;
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case IP_FW_ADD:
case IP_FW_DEL:
case IP_FW_FLUSH:
case IP_FW_ZERO:
case IP_FW_RESETLOG:
if (IPFW_LOADED)
error = ip_fw_ctl_ptr(sopt);
else
error = ENOPROTOOPT;
break;
case IP_DUMMYNET_CONFIGURE:
case IP_DUMMYNET_DEL:
case IP_DUMMYNET_FLUSH:
if (DUMMYNET_LOADED)
error = ip_dn_ctl_ptr(sopt);
else
error = ENOPROTOOPT ;
break ;
case IP_RSVP_ON:
error = ip_rsvp_init(so);
break;
Initial get-the-easy-case-working upgrade of the multicast code to something more recent than the ancient 1.2 release contained in 4.4. This code has the following advantages as compared to previous versions (culled from the README file for the SunOS release): - True multicast delivery - Configurable rate-limiting of forwarded multicast traffic on each physical interface or tunnel, using a token-bucket limiter. - Simplistic classification of packets for prioritized dropping. - Administrative scoping of multicast address ranges. - Faster detection of hosts leaving groups. - Support for multicast traceroute (code not yet available). - Support for RSVP, the Resource Reservation Protocol. What still needs to be done: - The multicast forwarder needs testing. - The multicast routing daemon needs to be ported. - Network interface drivers need to have the `#ifdef MULTICAST' goop ripped out of them. - The IGMP code should probably be bogon-tested. Some notes about the porting process: In some cases, the Berkeley people decided to incorporate functionality from later releases of the multicast code, but then had to do things differently. As a result, if you look at Deering's patches, and then look at our code, it is not always obvious whether the patch even applies. Let the reader beware. I ran ip_mroute.c through several passes of `unifdef' to get rid of useless grot, and to permanently enable the RSVP support, which we will include as standard. Ported by: Garrett Wollman Submitted by: Steve Deering and Ajit Thyagarajan (among others)
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case IP_RSVP_OFF:
error = ip_rsvp_done();
break;
Initial get-the-easy-case-working upgrade of the multicast code to something more recent than the ancient 1.2 release contained in 4.4. This code has the following advantages as compared to previous versions (culled from the README file for the SunOS release): - True multicast delivery - Configurable rate-limiting of forwarded multicast traffic on each physical interface or tunnel, using a token-bucket limiter. - Simplistic classification of packets for prioritized dropping. - Administrative scoping of multicast address ranges. - Faster detection of hosts leaving groups. - Support for multicast traceroute (code not yet available). - Support for RSVP, the Resource Reservation Protocol. What still needs to be done: - The multicast forwarder needs testing. - The multicast routing daemon needs to be ported. - Network interface drivers need to have the `#ifdef MULTICAST' goop ripped out of them. - The IGMP code should probably be bogon-tested. Some notes about the porting process: In some cases, the Berkeley people decided to incorporate functionality from later releases of the multicast code, but then had to do things differently. As a result, if you look at Deering's patches, and then look at our code, it is not always obvious whether the patch even applies. Let the reader beware. I ran ip_mroute.c through several passes of `unifdef' to get rid of useless grot, and to permanently enable the RSVP support, which we will include as standard. Ported by: Garrett Wollman Submitted by: Steve Deering and Ajit Thyagarajan (among others)
1994-09-06 22:42:31 +00:00
/* XXX - should be combined */
case IP_RSVP_VIF_ON:
error = ip_rsvp_vif_init(so, sopt);
break;
case IP_RSVP_VIF_OFF:
error = ip_rsvp_vif_done(so, sopt);
break;
case MRT_INIT:
case MRT_DONE:
case MRT_ADD_VIF:
case MRT_DEL_VIF:
case MRT_ADD_MFC:
case MRT_DEL_MFC:
case MRT_VERSION:
case MRT_ASSERT:
error = ip_mrouter_set(so, sopt);
break;
default:
error = ip_ctloutput(so, sopt);
break;
}
break;
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}
return (error);
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}
/*
* This function exists solely to receive the PRC_IFDOWN messages which
* are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa,
* and calls in_ifadown() to remove all routes corresponding to that address.
* It also receives the PRC_IFUP messages from if_up() and reinstalls the
* interface routes.
*/
void
rip_ctlinput(cmd, sa, vip)
int cmd;
struct sockaddr *sa;
void *vip;
{
struct in_ifaddr *ia;
struct ifnet *ifp;
int err;
int flags;
switch (cmd) {
case PRC_IFDOWN:
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TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
if (ia->ia_ifa.ifa_addr == sa
&& (ia->ia_flags & IFA_ROUTE)) {
/*
* in_ifscrub kills the interface route.
*/
in_ifscrub(ia->ia_ifp, ia);
/*
* in_ifadown gets rid of all the rest of
* the routes. This is not quite the right
* thing to do, but at least if we are running
* a routing process they will come back.
*/
in_ifadown(&ia->ia_ifa, 0);
break;
}
}
break;
case PRC_IFUP:
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TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
if (ia->ia_ifa.ifa_addr == sa)
break;
}
if (ia == 0 || (ia->ia_flags & IFA_ROUTE))
return;
flags = RTF_UP;
ifp = ia->ia_ifa.ifa_ifp;
if ((ifp->if_flags & IFF_LOOPBACK)
|| (ifp->if_flags & IFF_POINTOPOINT))
flags |= RTF_HOST;
err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
if (err == 0)
ia->ia_flags |= IFA_ROUTE;
break;
}
}
u_long rip_sendspace = RIPSNDQ;
u_long rip_recvspace = RIPRCVQ;
SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
&rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
&rip_recvspace, 0, "Maximum incoming raw IP datagram size");
static int
rip_attach(struct socket *so, int proto, struct thread *td)
{
struct inpcb *inp;
int error, s;
inp = sotoinpcb(so);
if (inp)
panic("rip_attach");
if (td && (error = suser_td(td)) != 0)
return error;
error = soreserve(so, rip_sendspace, rip_recvspace);
if (error)
return error;
s = splnet();
error = in_pcballoc(so, &ripcbinfo, td);
splx(s);
if (error)
return error;
inp = (struct inpcb *)so->so_pcb;
inp->inp_vflag |= INP_IPV4;
inp->inp_ip_p = proto;
inp->inp_ip_ttl = ip_defttl;
return 0;
}
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static int
rip_detach(struct socket *so)
{
struct inpcb *inp;
inp = sotoinpcb(so);
if (inp == 0)
panic("rip_detach");
if (so == ip_mrouter)
ip_mrouter_done();
ip_rsvp_force_done(so);
if (so == ip_rsvpd)
ip_rsvp_done();
in_pcbdetach(inp);
return 0;
}
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static int
rip_abort(struct socket *so)
{
soisdisconnected(so);
return rip_detach(so);
}
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static int
rip_disconnect(struct socket *so)
{
if ((so->so_state & SS_ISCONNECTED) == 0)
return ENOTCONN;
return rip_abort(so);
}
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static int
rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
{
struct inpcb *inp = sotoinpcb(so);
struct sockaddr_in *addr = (struct sockaddr_in *)nam;
if (nam->sa_len != sizeof(*addr))
return EINVAL;
if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) &&
(addr->sin_family != AF_IMPLINK)) ||
(addr->sin_addr.s_addr &&
ifa_ifwithaddr((struct sockaddr *)addr) == 0))
return EADDRNOTAVAIL;
inp->inp_laddr = addr->sin_addr;
return 0;
}
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static int
rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
{
struct inpcb *inp = sotoinpcb(so);
struct sockaddr_in *addr = (struct sockaddr_in *)nam;
if (nam->sa_len != sizeof(*addr))
return EINVAL;
if (TAILQ_EMPTY(&ifnet))
return EADDRNOTAVAIL;
if ((addr->sin_family != AF_INET) &&
(addr->sin_family != AF_IMPLINK))
return EAFNOSUPPORT;
inp->inp_faddr = addr->sin_addr;
soisconnected(so);
return 0;
}
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static int
rip_shutdown(struct socket *so)
{
socantsendmore(so);
return 0;
}
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static int
rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
struct mbuf *control, struct thread *td)
{
struct inpcb *inp = sotoinpcb(so);
register u_long dst;
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if (so->so_state & SS_ISCONNECTED) {
if (nam) {
m_freem(m);
return EISCONN;
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}
dst = inp->inp_faddr.s_addr;
} else {
if (nam == NULL) {
m_freem(m);
return ENOTCONN;
}
dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
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}
return rip_output(m, so, dst);
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}
static int
rip_pcblist(SYSCTL_HANDLER_ARGS)
{
int error, i, n, s;
struct inpcb *inp, **inp_list;
inp_gen_t gencnt;
struct xinpgen xig;
/*
* The process of preparing the TCB list is too time-consuming and
* resource-intensive to repeat twice on every request.
*/
if (req->oldptr == 0) {
n = ripcbinfo.ipi_count;
req->oldidx = 2 * (sizeof xig)
+ (n + n/8) * sizeof(struct xinpcb);
return 0;
}
if (req->newptr != 0)
return EPERM;
/*
* OK, now we're committed to doing something.
*/
s = splnet();
gencnt = ripcbinfo.ipi_gencnt;
n = ripcbinfo.ipi_count;
splx(s);
xig.xig_len = sizeof xig;
xig.xig_count = n;
xig.xig_gen = gencnt;
xig.xig_sogen = so_gencnt;
error = SYSCTL_OUT(req, &xig, sizeof xig);
if (error)
return error;
inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
if (inp_list == 0)
return ENOMEM;
s = splnet();
for (inp = LIST_FIRST(ripcbinfo.listhead), i = 0; inp && i < n;
inp = LIST_NEXT(inp, inp_list)) {
if (inp->inp_gencnt <= gencnt) {
if (cr_canseesocket(req->td->td_ucred,
inp->inp_socket))
continue;
inp_list[i++] = inp;
}
}
splx(s);
n = i;
error = 0;
for (i = 0; i < n; i++) {
inp = inp_list[i];
if (inp->inp_gencnt <= gencnt) {
struct xinpcb xi;
xi.xi_len = sizeof xi;
/* XXX should avoid extra copy */
bcopy(inp, &xi.xi_inp, sizeof *inp);
if (inp->inp_socket)
sotoxsocket(inp->inp_socket, &xi.xi_socket);
error = SYSCTL_OUT(req, &xi, sizeof xi);
}
}
if (!error) {
/*
* Give the user an updated idea of our state.
* If the generation differs from what we told
* her before, she knows that something happened
* while we were processing this request, and it
* might be necessary to retry.
*/
s = splnet();
xig.xig_gen = ripcbinfo.ipi_gencnt;
xig.xig_sogen = so_gencnt;
xig.xig_count = ripcbinfo.ipi_count;
splx(s);
error = SYSCTL_OUT(req, &xig, sizeof xig);
}
free(inp_list, M_TEMP);
return error;
}
SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0,
rip_pcblist, "S,xinpcb", "List of active raw IP sockets");
struct pr_usrreqs rip_usrreqs = {
rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect,
pru_connect2_notsupp, in_control, rip_detach, rip_disconnect,
pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp,
pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown,
in_setsockaddr, sosend, soreceive, sopoll
};