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b2e60773c6
freebsd-nq/sys/netinet/ip_output.c
John Baldwin b2e60773c6 Add kernel-side support for in-kernel TLS. 
KTLS adds support for in-kernel framing and encryption of Transport
Layer Security (1.0-1.2) data on TCP sockets.  KTLS only supports
offload of TLS for transmitted data.  Key negotation must still be
performed in userland.  Once completed, transmit session keys for a
connection are provided to the kernel via a new TCP_TXTLS_ENABLE
socket option.  All subsequent data transmitted on the socket is
placed into TLS frames and encrypted using the supplied keys.

Any data written to a KTLS-enabled socket via write(2), aio_write(2),
or sendfile(2) is assumed to be application data and is encoded in TLS
frames with an application data type.  Individual records can be sent
with a custom type (e.g. handshake messages) via sendmsg(2) with a new
control message (TLS_SET_RECORD_TYPE) specifying the record type.

At present, rekeying is not supported though the in-kernel framework
should support rekeying.

KTLS makes use of the recently added unmapped mbufs to store TLS
frames in the socket buffer.  Each TLS frame is described by a single
ext_pgs mbuf.  The ext_pgs structure contains the header of the TLS
record (and trailer for encrypted records) as well as references to
the associated TLS session.

KTLS supports two primary methods of encrypting TLS frames: software
TLS and ifnet TLS.

Software TLS marks mbufs holding socket data as not ready via
M_NOTREADY similar to sendfile(2) when TLS framing information is
added to an unmapped mbuf in ktls_frame().  ktls_enqueue() is then
called to schedule TLS frames for encryption.  In the case of
sendfile_iodone() calls ktls_enqueue() instead of pru_ready() leaving
the mbufs marked M_NOTREADY until encryption is completed.  For other
writes (vn_sendfile when pages are available, write(2), etc.), the
PRUS_NOTREADY is set when invoking pru_send() along with invoking
ktls_enqueue().

A pool of worker threads (the "KTLS" kernel process) encrypts TLS
frames queued via ktls_enqueue().  Each TLS frame is temporarily
mapped using the direct map and passed to a software encryption
backend to perform the actual encryption.

(Note: The use of PHYS_TO_DMAP could be replaced with sf_bufs if
someone wished to make this work on architectures without a direct
map.)

KTLS supports pluggable software encryption backends.  Internally,
Netflix uses proprietary pure-software backends.  This commit includes
a simple backend in a new ktls_ocf.ko module that uses the kernel's
OpenCrypto framework to provide AES-GCM encryption of TLS frames.  As
a result, software TLS is now a bit of a misnomer as it can make use
of hardware crypto accelerators.

Once software encryption has finished, the TLS frame mbufs are marked
ready via pru_ready().  At this point, the encrypted data appears as
regular payload to the TCP stack stored in unmapped mbufs.

ifnet TLS permits a NIC to offload the TLS encryption and TCP
segmentation.  In this mode, a new send tag type (IF_SND_TAG_TYPE_TLS)
is allocated on the interface a socket is routed over and associated
with a TLS session.  TLS records for a TLS session using ifnet TLS are
not marked M_NOTREADY but are passed down the stack unencrypted.  The
ip_output_send() and ip6_output_send() helper functions that apply
send tags to outbound IP packets verify that the send tag of the TLS
record matches the outbound interface.  If so, the packet is tagged
with the TLS send tag and sent to the interface.  The NIC device
driver must recognize packets with the TLS send tag and schedule them
for TLS encryption and TCP segmentation.  If the the outbound
interface does not match the interface in the TLS send tag, the packet
is dropped.  In addition, a task is scheduled to refresh the TLS send
tag for the TLS session.  If a new TLS send tag cannot be allocated,
the connection is dropped.  If a new TLS send tag is allocated,
however, subsequent packets will be tagged with the correct TLS send
tag.  (This latter case has been tested by configuring both ports of a
Chelsio T6 in a lagg and failing over from one port to another.  As
the connections migrated to the new port, new TLS send tags were
allocated for the new port and connections resumed without being
dropped.)

ifnet TLS can be enabled and disabled on supported network interfaces
via new '[-]txtls[46]' options to ifconfig(8).  ifnet TLS is supported
across both vlan devices and lagg interfaces using failover, lacp with
flowid enabled, or lacp with flowid enabled.

Applications may request the current KTLS mode of a connection via a
new TCP_TXTLS_MODE socket option.  They can also use this socket
option to toggle between software and ifnet TLS modes.

In addition, a testing tool is available in tools/tools/switch_tls.
This is modeled on tcpdrop and uses similar syntax.  However, instead
of dropping connections, -s is used to force KTLS connections to
switch to software TLS and -i is used to switch to ifnet TLS.

Various sysctls and counters are available under the kern.ipc.tls
sysctl node.  The kern.ipc.tls.enable node must be set to true to
enable KTLS (it is off by default).  The use of unmapped mbufs must
also be enabled via kern.ipc.mb_use_ext_pgs to enable KTLS.

KTLS is enabled via the KERN_TLS kernel option.

This patch is the culmination of years of work by several folks
including Scott Long and Randall Stewart for the original design and
implementation; Drew Gallatin for several optimizations including the
use of ext_pgs mbufs, the M_NOTREADY mechanism for TLS records
awaiting software encryption, and pluggable software crypto backends;
and John Baldwin for modifications to support hardware TLS offload.

Reviewed by:	gallatin, hselasky, rrs
Obtained from:	Netflix
Sponsored by:	Netflix, Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D21277
2019-08-27 00:01:56 +00:00

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39 KiB
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1982, 1986, 1988, 1990, 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. 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.
*
* @(#)ip_output.c 8.3 (Berkeley) 1/21/94
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_ipsec.h"
#include "opt_kern_tls.h"
#include "opt_mbuf_stress_test.h"
#include "opt_mpath.h"
#include "opt_ratelimit.h"
#include "opt_route.h"
#include "opt_rss.h"
#include "opt_sctp.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/ktls.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/rmlock.h>
#include <sys/sdt.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/ucred.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_llatbl.h>
#include <net/netisr.h>
#include <net/pfil.h>
#include <net/route.h>
#ifdef RADIX_MPATH
#include <net/radix_mpath.h>
#endif
#include <net/rss_config.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_fib.h>
#include <netinet/in_kdtrace.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_rss.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#include <netinet/ip_options.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#ifdef SCTP
#include <netinet/sctp.h>
#include <netinet/sctp_crc32.h>
#endif
#include <netipsec/ipsec_support.h>
#include <machine/in_cksum.h>
#include <security/mac/mac_framework.h>
#ifdef MBUF_STRESS_TEST
static int mbuf_frag_size = 0;
SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
&mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
#endif
static void ip_mloopback(struct ifnet *, const struct mbuf *, int);
extern int in_mcast_loop;
extern struct protosw inetsw[];
static inline int
ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, int flags,
struct inpcb *inp, struct sockaddr_in *dst, int *fibnum, int *error)
{
struct m_tag *fwd_tag = NULL;
struct mbuf *m;
struct in_addr odst;
struct ip *ip;
int pflags = PFIL_OUT;
if (flags & IP_FORWARDING)
pflags |= PFIL_FWD;
m = *mp;
ip = mtod(m, struct ip *);
/* Run through list of hooks for output packets. */
odst.s_addr = ip->ip_dst.s_addr;
switch (pfil_run_hooks(V_inet_pfil_head, mp, ifp, pflags, inp)) {
case PFIL_DROPPED:
*error = EPERM;
/* FALLTHROUGH */
case PFIL_CONSUMED:
return 1; /* Finished */
case PFIL_PASS:
*error = 0;
}
m = *mp;
ip = mtod(m, struct ip *);
/* See if destination IP address was changed by packet filter. */
if (odst.s_addr != ip->ip_dst.s_addr) {
m->m_flags |= M_SKIP_FIREWALL;
/* If destination is now ourself drop to ip_input(). */
if (in_localip(ip->ip_dst)) {
m->m_flags |= M_FASTFWD_OURS;
if (m->m_pkthdr.rcvif == NULL)
m->m_pkthdr.rcvif = V_loif;
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
m->m_pkthdr.csum_flags |=
CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
m->m_pkthdr.csum_data = 0xffff;
}
m->m_pkthdr.csum_flags |=
CSUM_IP_CHECKED | CSUM_IP_VALID;
#ifdef SCTP
if (m->m_pkthdr.csum_flags & CSUM_SCTP)
m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
#endif
*error = netisr_queue(NETISR_IP, m);
return 1; /* Finished */
}
bzero(dst, sizeof(*dst));
dst->sin_family = AF_INET;
dst->sin_len = sizeof(*dst);
dst->sin_addr = ip->ip_dst;
return -1; /* Reloop */
}
/* See if fib was changed by packet filter. */
if ((*fibnum) != M_GETFIB(m)) {
m->m_flags |= M_SKIP_FIREWALL;
*fibnum = M_GETFIB(m);
return -1; /* Reloop for FIB change */
}
/* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
if (m->m_flags & M_FASTFWD_OURS) {
if (m->m_pkthdr.rcvif == NULL)
m->m_pkthdr.rcvif = V_loif;
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
m->m_pkthdr.csum_flags |=
CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
m->m_pkthdr.csum_data = 0xffff;
}
#ifdef SCTP
if (m->m_pkthdr.csum_flags & CSUM_SCTP)
m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
#endif
m->m_pkthdr.csum_flags |=
CSUM_IP_CHECKED | CSUM_IP_VALID;
*error = netisr_queue(NETISR_IP, m);
return 1; /* Finished */
}
/* Or forward to some other address? */
if ((m->m_flags & M_IP_NEXTHOP) &&
((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
m->m_flags |= M_SKIP_FIREWALL;
m->m_flags &= ~M_IP_NEXTHOP;
m_tag_delete(m, fwd_tag);
return -1; /* Reloop for CHANGE of dst */
}
return 0;
}
static int
ip_output_send(struct inpcb *inp, struct ifnet *ifp, struct mbuf *m,
const struct sockaddr_in *gw, struct route *ro)
{
#ifdef KERN_TLS
struct ktls_session *tls = NULL;
#endif
struct m_snd_tag *mst;
int error;
MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
mst = NULL;
#ifdef KERN_TLS
/*
* If this is an unencrypted TLS record, save a reference to
* the record. This local reference is used to call
* ktls_output_eagain after the mbuf has been freed (thus
* dropping the mbuf's reference) in if_output.
*/
if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) {
tls = ktls_hold(m->m_next->m_ext.ext_pgs->tls);
mst = tls->snd_tag;
/*
* If a TLS session doesn't have a valid tag, it must
* have had an earlier ifp mismatch, so drop this
* packet.
*/
if (mst == NULL) {
error = EAGAIN;
goto done;
}
}
#endif
#ifdef RATELIMIT
if (inp != NULL && mst == NULL) {
if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 ||
(inp->inp_snd_tag != NULL &&
inp->inp_snd_tag->ifp != ifp))
in_pcboutput_txrtlmt(inp, ifp, m);
if (inp->inp_snd_tag != NULL)
mst = inp->inp_snd_tag;
}
#endif
if (mst != NULL) {
KASSERT(m->m_pkthdr.rcvif == NULL,
("trying to add a send tag to a forwarded packet"));
if (mst->ifp != ifp) {
error = EAGAIN;
goto done;
}
/* stamp send tag on mbuf */
m->m_pkthdr.snd_tag = m_snd_tag_ref(mst);
m->m_pkthdr.csum_flags |= CSUM_SND_TAG;
}
error = (*ifp->if_output)(ifp, m, (const struct sockaddr *)gw, ro);
done:
/* Check for route change invalidating send tags. */
#ifdef KERN_TLS
if (tls != NULL) {
if (error == EAGAIN)
error = ktls_output_eagain(inp, tls);
ktls_free(tls);
}
#endif
#ifdef RATELIMIT
if (error == EAGAIN)
in_pcboutput_eagain(inp);
#endif
return (error);
}
/*
* IP output. The packet in mbuf chain m contains a skeletal IP
* header (with len, off, ttl, proto, tos, src, dst).
* The mbuf chain containing the packet will be freed.
* The mbuf opt, if present, will not be freed.
* If route ro is present and has ro_rt initialized, route lookup would be
* skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
* then result of route lookup is stored in ro->ro_rt.
*
* In the IP forwarding case, the packet will arrive with options already
* inserted, so must have a NULL opt pointer.
*/
int
ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
struct ip_moptions *imo, struct inpcb *inp)
{
struct rm_priotracker in_ifa_tracker;
struct epoch_tracker et;
struct ip *ip;
struct ifnet *ifp = NULL; /* keep compiler happy */
struct mbuf *m0;
int hlen = sizeof (struct ip);
int mtu;
int error = 0;
struct sockaddr_in *dst, sin;
const struct sockaddr_in *gw;
struct in_ifaddr *ia;
struct in_addr src;
int isbroadcast;
uint16_t ip_len, ip_off;
uint32_t fibnum;
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
int no_route_but_check_spd = 0;
#endif
M_ASSERTPKTHDR(m);
if (inp != NULL) {
INP_LOCK_ASSERT(inp);
M_SETFIB(m, inp->inp_inc.inc_fibnum);
if ((flags & IP_NODEFAULTFLOWID) == 0) {
m->m_pkthdr.flowid = inp->inp_flowid;
M_HASHTYPE_SET(m, inp->inp_flowtype);
}
#ifdef NUMA
m->m_pkthdr.numa_domain = inp->inp_numa_domain;
#endif
}
if (opt) {
int len = 0;
m = ip_insertoptions(m, opt, &len);
if (len != 0)
hlen = len; /* ip->ip_hl is updated above */
}
ip = mtod(m, struct ip *);
ip_len = ntohs(ip->ip_len);
ip_off = ntohs(ip->ip_off);
if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
ip->ip_v = IPVERSION;
ip->ip_hl = hlen >> 2;
ip_fillid(ip);
} else {
/* Header already set, fetch hlen from there */
hlen = ip->ip_hl << 2;
}
if ((flags & IP_FORWARDING) == 0)
IPSTAT_INC(ips_localout);
/*
* dst/gw handling:
*
* gw is readonly but can point either to dst OR rt_gateway,
* therefore we need restore gw if we're redoing lookup.
*/
fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
if (ro != NULL)
dst = (struct sockaddr_in *)&ro->ro_dst;
else
dst = &sin;
if (ro == NULL || ro->ro_rt == NULL) {
bzero(dst, sizeof(*dst));
dst->sin_family = AF_INET;
dst->sin_len = sizeof(*dst);
dst->sin_addr = ip->ip_dst;
}
gw = dst;
NET_EPOCH_ENTER(et);
again:
/*
* Validate route against routing table additions;
* a better/more specific route might have been added.
*/
if (inp != NULL && ro != NULL && ro->ro_rt != NULL)
RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum);
/*
* If there is a cached route,
* check that it is to the same destination
* and is still up. If not, free it and try again.
* The address family should also be checked in case of sharing the
* cache with IPv6.
* Also check whether routing cache needs invalidation.
*/
if (ro != NULL && ro->ro_rt != NULL &&
((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
ro->ro_rt->rt_ifp == NULL || !RT_LINK_IS_UP(ro->ro_rt->rt_ifp) ||
dst->sin_family != AF_INET ||
dst->sin_addr.s_addr != ip->ip_dst.s_addr))
RO_INVALIDATE_CACHE(ro);
ia = NULL;
/*
* If routing to interface only, short circuit routing lookup.
* The use of an all-ones broadcast address implies this; an
* interface is specified by the broadcast address of an interface,
* or the destination address of a ptp interface.
*/
if (flags & IP_SENDONES) {
if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst),
M_GETFIB(m)))) == NULL &&
(ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
M_GETFIB(m)))) == NULL) {
IPSTAT_INC(ips_noroute);
error = ENETUNREACH;
goto bad;
}
ip->ip_dst.s_addr = INADDR_BROADCAST;
dst->sin_addr = ip->ip_dst;
ifp = ia->ia_ifp;
mtu = ifp->if_mtu;
ip->ip_ttl = 1;
isbroadcast = 1;
src = IA_SIN(ia)->sin_addr;
} else if (flags & IP_ROUTETOIF) {
if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
M_GETFIB(m)))) == NULL &&
(ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
M_GETFIB(m)))) == NULL) {
IPSTAT_INC(ips_noroute);
error = ENETUNREACH;
goto bad;
}
ifp = ia->ia_ifp;
mtu = ifp->if_mtu;
ip->ip_ttl = 1;
isbroadcast = ifp->if_flags & IFF_BROADCAST ?
in_ifaddr_broadcast(dst->sin_addr, ia) : 0;
src = IA_SIN(ia)->sin_addr;
} else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
imo != NULL && imo->imo_multicast_ifp != NULL) {
/*
* Bypass the normal routing lookup for multicast
* packets if the interface is specified.
*/
ifp = imo->imo_multicast_ifp;
mtu = ifp->if_mtu;
IFP_TO_IA(ifp, ia, &in_ifa_tracker);
isbroadcast = 0; /* fool gcc */
/* Interface may have no addresses. */
if (ia != NULL)
src = IA_SIN(ia)->sin_addr;
else
src.s_addr = INADDR_ANY;
} else if (ro != NULL) {
if (ro->ro_rt == NULL) {
/*
* We want to do any cloning requested by the link
* layer, as this is probably required in all cases
* for correct operation (as it is for ARP).
*/
#ifdef RADIX_MPATH
rtalloc_mpath_fib(ro,
ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr),
fibnum);
#else
in_rtalloc_ign(ro, 0, fibnum);
#endif
if (ro->ro_rt == NULL ||
(ro->ro_rt->rt_flags & RTF_UP) == 0 ||
ro->ro_rt->rt_ifp == NULL ||
!RT_LINK_IS_UP(ro->ro_rt->rt_ifp)) {
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
/*
* There is no route for this packet, but it is
* possible that a matching SPD entry exists.
*/
no_route_but_check_spd = 1;
mtu = 0; /* Silence GCC warning. */
goto sendit;
#endif
IPSTAT_INC(ips_noroute);
error = EHOSTUNREACH;
goto bad;
}
}
ia = ifatoia(ro->ro_rt->rt_ifa);
ifp = ro->ro_rt->rt_ifp;
counter_u64_add(ro->ro_rt->rt_pksent, 1);
rt_update_ro_flags(ro);
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
gw = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
if (ro->ro_rt->rt_flags & RTF_HOST)
isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST);
else if (ifp->if_flags & IFF_BROADCAST)
isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia);
else
isbroadcast = 0;
if (ro->ro_rt->rt_flags & RTF_HOST)
mtu = ro->ro_rt->rt_mtu;
else
mtu = ifp->if_mtu;
src = IA_SIN(ia)->sin_addr;
} else {
struct nhop4_extended nh;
bzero(&nh, sizeof(nh));
if (fib4_lookup_nh_ext(M_GETFIB(m), ip->ip_dst, 0, 0, &nh) !=
0) {
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
/*
* There is no route for this packet, but it is
* possible that a matching SPD entry exists.
*/
no_route_but_check_spd = 1;
mtu = 0; /* Silence GCC warning. */
goto sendit;
#endif
IPSTAT_INC(ips_noroute);
error = EHOSTUNREACH;
goto bad;
}
ifp = nh.nh_ifp;
mtu = nh.nh_mtu;
/*
* We are rewriting here dst to be gw actually, contradicting
* comment at the beginning of the function. However, in this
* case we are always dealing with on stack dst.
* In case if pfil(9) sends us back to beginning of the
* function, the dst would be rewritten by ip_output_pfil().
*/
MPASS(dst == &sin);
dst->sin_addr = nh.nh_addr;
ia = nh.nh_ia;
src = nh.nh_src;
isbroadcast = (((nh.nh_flags & (NHF_HOST | NHF_BROADCAST)) ==
(NHF_HOST | NHF_BROADCAST)) ||
((ifp->if_flags & IFF_BROADCAST) &&
in_ifaddr_broadcast(dst->sin_addr, ia)));
}
/* Catch a possible divide by zero later. */
KASSERT(mtu > 0, ("%s: mtu %d <= 0, ro=%p (rt_flags=0x%08x) ifp=%p",
__func__, mtu, ro,
(ro != NULL && ro->ro_rt != NULL) ? ro->ro_rt->rt_flags : 0, ifp));
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
m->m_flags |= M_MCAST;
/*
* IP destination address is multicast. Make sure "gw"
* still points to the address in "ro". (It may have been
* changed to point to a gateway address, above.)
*/
gw = dst;
/*
* See if the caller provided any multicast options
*/
if (imo != NULL) {
ip->ip_ttl = imo->imo_multicast_ttl;
if (imo->imo_multicast_vif != -1)
ip->ip_src.s_addr =
ip_mcast_src ?
ip_mcast_src(imo->imo_multicast_vif) :
INADDR_ANY;
} else
ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
/*
* Confirm that the outgoing interface supports multicast.
*/
if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
IPSTAT_INC(ips_noroute);
error = ENETUNREACH;
goto bad;
}
}
/*
* If source address not specified yet, use address
* of outgoing interface.
*/
if (ip->ip_src.s_addr == INADDR_ANY)
ip->ip_src = src;
if ((imo == NULL && in_mcast_loop) ||
(imo && imo->imo_multicast_loop)) {
/*
* Loop back multicast datagram if not expressly
* forbidden to do so, even if we are not a member
* of the group; ip_input() will filter it later,
* thus deferring a hash lookup and mutex acquisition
* at the expense of a cheap copy using m_copym().
*/
ip_mloopback(ifp, m, hlen);
} else {
/*
* If we are acting as a multicast router, perform
* multicast forwarding as if the packet had just
* arrived on the interface to which we are about
* to send. The multicast forwarding function
* recursively calls this function, using the
* IP_FORWARDING flag to prevent infinite recursion.
*
* Multicasts that are looped back by ip_mloopback(),
* above, will be forwarded by the ip_input() routine,
* if necessary.
*/
if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) {
/*
* If rsvp daemon is not running, do not
* set ip_moptions. This ensures that the packet
* is multicast and not just sent down one link
* as prescribed by rsvpd.
*/
if (!V_rsvp_on)
imo = NULL;
if (ip_mforward &&
ip_mforward(ip, ifp, m, imo) != 0) {
m_freem(m);
goto done;
}
}
}
/*
* Multicasts with a time-to-live of zero may be looped-
* back, above, but must not be transmitted on a network.
* Also, multicasts addressed to the loopback interface
* are not sent -- the above call to ip_mloopback() will
* loop back a copy. ip_input() will drop the copy if
* this host does not belong to the destination group on
* the loopback interface.
*/
if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
m_freem(m);
goto done;
}
goto sendit;
}
/*
* If the source address is not specified yet, use the address
* of the outoing interface.
*/
if (ip->ip_src.s_addr == INADDR_ANY)
ip->ip_src = src;
/*
* Look for broadcast address and
* verify user is allowed to send
* such a packet.
*/
if (isbroadcast) {
if ((ifp->if_flags & IFF_BROADCAST) == 0) {
error = EADDRNOTAVAIL;
goto bad;
}
if ((flags & IP_ALLOWBROADCAST) == 0) {
error = EACCES;
goto bad;
}
/* don't allow broadcast messages to be fragmented */
if (ip_len > mtu) {
error = EMSGSIZE;
goto bad;
}
m->m_flags |= M_BCAST;
} else {
m->m_flags &= ~M_BCAST;
}
sendit:
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
if (IPSEC_ENABLED(ipv4)) {
if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) {
if (error == EINPROGRESS)
error = 0;
goto done;
}
}
/*
* Check if there was a route for this packet; return error if not.
*/
if (no_route_but_check_spd) {
IPSTAT_INC(ips_noroute);
error = EHOSTUNREACH;
goto bad;
}
/* Update variables that are affected by ipsec4_output(). */
ip = mtod(m, struct ip *);
hlen = ip->ip_hl << 2;
#endif /* IPSEC */
/* Jump over all PFIL processing if hooks are not active. */
if (PFIL_HOOKED_OUT(V_inet_pfil_head)) {
switch (ip_output_pfil(&m, ifp, flags, inp, dst, &fibnum,
&error)) {
case 1: /* Finished */
goto done;
case 0: /* Continue normally */
ip = mtod(m, struct ip *);
break;
case -1: /* Need to try again */
/* Reset everything for a new round */
if (ro != NULL) {
RO_RTFREE(ro);
ro->ro_prepend = NULL;
}
gw = dst;
ip = mtod(m, struct ip *);
goto again;
}
}
/* IN_LOOPBACK must not appear on the wire - RFC1122. */
if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) ||
IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) {
if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
IPSTAT_INC(ips_badaddr);
error = EADDRNOTAVAIL;
goto bad;
}
}
m->m_pkthdr.csum_flags |= CSUM_IP;
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
m = mb_unmapped_to_ext(m);
if (m == NULL) {
IPSTAT_INC(ips_odropped);
error = ENOBUFS;
goto bad;
}
in_delayed_cksum(m);
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
} else if ((ifp->if_capenable & IFCAP_NOMAP) == 0) {
m = mb_unmapped_to_ext(m);
if (m == NULL) {
IPSTAT_INC(ips_odropped);
error = ENOBUFS;
goto bad;
}
}
#ifdef SCTP
if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
m = mb_unmapped_to_ext(m);
if (m == NULL) {
IPSTAT_INC(ips_odropped);
error = ENOBUFS;
goto bad;
}
sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
}
#endif
/*
* If small enough for interface, or the interface will take
* care of the fragmentation for us, we can just send directly.
*/
if (ip_len <= mtu ||
(m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
ip->ip_sum = 0;
if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
ip->ip_sum = in_cksum(m, hlen);
m->m_pkthdr.csum_flags &= ~CSUM_IP;
}
/*
* Record statistics for this interface address.
* With CSUM_TSO the byte/packet count will be slightly
* incorrect because we count the IP+TCP headers only
* once instead of for every generated packet.
*/
if (!(flags & IP_FORWARDING) && ia) {
if (m->m_pkthdr.csum_flags & CSUM_TSO)
counter_u64_add(ia->ia_ifa.ifa_opackets,
m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
else
counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
}
#ifdef MBUF_STRESS_TEST
if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
#endif
/*
* Reset layer specific mbuf flags
* to avoid confusing lower layers.
*/
m_clrprotoflags(m);
IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
error = ip_output_send(inp, ifp, m, gw, ro);
goto done;
}
/* Balk when DF bit is set or the interface didn't support TSO. */
if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) {
error = EMSGSIZE;
IPSTAT_INC(ips_cantfrag);
goto bad;
}
/*
* Too large for interface; fragment if possible. If successful,
* on return, m will point to a list of packets to be sent.
*/
error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
if (error)
goto bad;
for (; m; m = m0) {
m0 = m->m_nextpkt;
m->m_nextpkt = 0;
if (error == 0) {
/* Record statistics for this interface address. */
if (ia != NULL) {
counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
counter_u64_add(ia->ia_ifa.ifa_obytes,
m->m_pkthdr.len);
}
/*
* Reset layer specific mbuf flags
* to avoid confusing upper layers.
*/
m_clrprotoflags(m);
IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
mtod(m, struct ip *), NULL);
error = ip_output_send(inp, ifp, m, gw, ro);
} else
m_freem(m);
}
if (error == 0)
IPSTAT_INC(ips_fragmented);
done:
NET_EPOCH_EXIT(et);
return (error);
bad:
m_freem(m);
goto done;
}
/*
* Create a chain of fragments which fit the given mtu. m_frag points to the
* mbuf to be fragmented; on return it points to the chain with the fragments.
* Return 0 if no error. If error, m_frag may contain a partially built
* chain of fragments that should be freed by the caller.
*
* if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
*/
int
ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
u_long if_hwassist_flags)
{
int error = 0;
int hlen = ip->ip_hl << 2;
int len = (mtu - hlen) & ~7; /* size of payload in each fragment */
int off;
struct mbuf *m0 = *m_frag; /* the original packet */
int firstlen;
struct mbuf **mnext;
int nfrags;
uint16_t ip_len, ip_off;
ip_len = ntohs(ip->ip_len);
ip_off = ntohs(ip->ip_off);
if (ip_off & IP_DF) { /* Fragmentation not allowed */
IPSTAT_INC(ips_cantfrag);
return EMSGSIZE;
}
/*
* Must be able to put at least 8 bytes per fragment.
*/
if (len < 8)
return EMSGSIZE;
/*
* If the interface will not calculate checksums on
* fragmented packets, then do it here.
*/
if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
m0 = mb_unmapped_to_ext(m0);
if (m0 == NULL) {
error = ENOBUFS;
IPSTAT_INC(ips_odropped);
goto done;
}
in_delayed_cksum(m0);
m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
#ifdef SCTP
if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
m0 = mb_unmapped_to_ext(m0);
if (m0 == NULL) {
error = ENOBUFS;
IPSTAT_INC(ips_odropped);
goto done;
}
sctp_delayed_cksum(m0, hlen);
m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
}
#endif
if (len > PAGE_SIZE) {
/*
* Fragment large datagrams such that each segment
* contains a multiple of PAGE_SIZE amount of data,
* plus headers. This enables a receiver to perform
* page-flipping zero-copy optimizations.
*
* XXX When does this help given that sender and receiver
* could have different page sizes, and also mtu could
* be less than the receiver's page size ?
*/
int newlen;
off = MIN(mtu, m0->m_pkthdr.len);
/*
* firstlen (off - hlen) must be aligned on an
* 8-byte boundary
*/
if (off < hlen)
goto smart_frag_failure;
off = ((off - hlen) & ~7) + hlen;
newlen = (~PAGE_MASK) & mtu;
if ((newlen + sizeof (struct ip)) > mtu) {
/* we failed, go back the default */
smart_frag_failure:
newlen = len;
off = hlen + len;
}
len = newlen;
} else {
off = hlen + len;
}
firstlen = off - hlen;
mnext = &m0->m_nextpkt; /* pointer to next packet */
/*
* Loop through length of segment after first fragment,
* make new header and copy data of each part and link onto chain.
* Here, m0 is the original packet, m is the fragment being created.
* The fragments are linked off the m_nextpkt of the original
* packet, which after processing serves as the first fragment.
*/
for (nfrags = 1; off < ip_len; off += len, nfrags++) {
struct ip *mhip; /* ip header on the fragment */
struct mbuf *m;
int mhlen = sizeof (struct ip);
m = m_gethdr(M_NOWAIT, MT_DATA);
if (m == NULL) {
error = ENOBUFS;
IPSTAT_INC(ips_odropped);
goto done;
}
/*
* Make sure the complete packet header gets copied
* from the originating mbuf to the newly created
* mbuf. This also ensures that existing firewall
* classification(s), VLAN tags and so on get copied
* to the resulting fragmented packet(s):
*/
if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
m_free(m);
error = ENOBUFS;
IPSTAT_INC(ips_odropped);
goto done;
}
/*
* In the first mbuf, leave room for the link header, then
* copy the original IP header including options. The payload
* goes into an additional mbuf chain returned by m_copym().
*/
m->m_data += max_linkhdr;
mhip = mtod(m, struct ip *);
*mhip = *ip;
if (hlen > sizeof (struct ip)) {
mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
mhip->ip_v = IPVERSION;
mhip->ip_hl = mhlen >> 2;
}
m->m_len = mhlen;
/* XXX do we need to add ip_off below ? */
mhip->ip_off = ((off - hlen) >> 3) + ip_off;
if (off + len >= ip_len)
len = ip_len - off;
else
mhip->ip_off |= IP_MF;
mhip->ip_len = htons((u_short)(len + mhlen));
m->m_next = m_copym(m0, off, len, M_NOWAIT);
if (m->m_next == NULL) { /* copy failed */
m_free(m);
error = ENOBUFS; /* ??? */
IPSTAT_INC(ips_odropped);
goto done;
}
m->m_pkthdr.len = mhlen + len;
#ifdef MAC
mac_netinet_fragment(m0, m);
#endif
mhip->ip_off = htons(mhip->ip_off);
mhip->ip_sum = 0;
if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
mhip->ip_sum = in_cksum(m, mhlen);
m->m_pkthdr.csum_flags &= ~CSUM_IP;
}
*mnext = m;
mnext = &m->m_nextpkt;
}
IPSTAT_ADD(ips_ofragments, nfrags);
/*
* Update first fragment by trimming what's been copied out
* and updating header.
*/
m_adj(m0, hlen + firstlen - ip_len);
m0->m_pkthdr.len = hlen + firstlen;
ip->ip_len = htons((u_short)m0->m_pkthdr.len);
ip->ip_off = htons(ip_off | IP_MF);
ip->ip_sum = 0;
if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
ip->ip_sum = in_cksum(m0, hlen);
m0->m_pkthdr.csum_flags &= ~CSUM_IP;
}
done:
*m_frag = m0;
return error;
}
void
in_delayed_cksum(struct mbuf *m)
{
struct ip *ip;
struct udphdr *uh;
uint16_t cklen, csum, offset;
ip = mtod(m, struct ip *);
offset = ip->ip_hl << 2 ;
if (m->m_pkthdr.csum_flags & CSUM_UDP) {
/* if udp header is not in the first mbuf copy udplen */
if (offset + sizeof(struct udphdr) > m->m_len) {
m_copydata(m, offset + offsetof(struct udphdr,
uh_ulen), sizeof(cklen), (caddr_t)&cklen);
cklen = ntohs(cklen);
} else {
uh = (struct udphdr *)mtodo(m, offset);
cklen = ntohs(uh->uh_ulen);
}
csum = in_cksum_skip(m, cklen + offset, offset);
if (csum == 0)
csum = 0xffff;
} else {
cklen = ntohs(ip->ip_len);
csum = in_cksum_skip(m, cklen, offset);
}
offset += m->m_pkthdr.csum_data; /* checksum offset */
if (offset + sizeof(csum) > m->m_len)
m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
else
*(u_short *)mtodo(m, offset) = csum;
}
/*
* IP socket option processing.
*/
int
ip_ctloutput(struct socket *so, struct sockopt *sopt)
{
struct inpcb *inp = sotoinpcb(so);
int error, optval;
#ifdef RSS
uint32_t rss_bucket;
int retval;
#endif
error = optval = 0;
if (sopt->sopt_level != IPPROTO_IP) {
error = EINVAL;
if (sopt->sopt_level == SOL_SOCKET &&
sopt->sopt_dir == SOPT_SET) {
switch (sopt->sopt_name) {
case SO_REUSEADDR:
INP_WLOCK(inp);
if ((so->so_options & SO_REUSEADDR) != 0)
inp->inp_flags2 |= INP_REUSEADDR;
else
inp->inp_flags2 &= ~INP_REUSEADDR;
INP_WUNLOCK(inp);
error = 0;
break;
case SO_REUSEPORT:
INP_WLOCK(inp);
if ((so->so_options & SO_REUSEPORT) != 0)
inp->inp_flags2 |= INP_REUSEPORT;
else
inp->inp_flags2 &= ~INP_REUSEPORT;
INP_WUNLOCK(inp);
error = 0;
break;
case SO_REUSEPORT_LB:
INP_WLOCK(inp);
if ((so->so_options & SO_REUSEPORT_LB) != 0)
inp->inp_flags2 |= INP_REUSEPORT_LB;
else
inp->inp_flags2 &= ~INP_REUSEPORT_LB;
INP_WUNLOCK(inp);
error = 0;
break;
case SO_SETFIB:
INP_WLOCK(inp);
inp->inp_inc.inc_fibnum = so->so_fibnum;
INP_WUNLOCK(inp);
error = 0;
break;
case SO_MAX_PACING_RATE:
#ifdef RATELIMIT
INP_WLOCK(inp);
inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
INP_WUNLOCK(inp);
error = 0;
#else
error = EOPNOTSUPP;
#endif
break;
default:
break;
}
}
return (error);
}
switch (sopt->sopt_dir) {
case SOPT_SET:
switch (sopt->sopt_name) {
case IP_OPTIONS:
#ifdef notyet
case IP_RETOPTS:
#endif
{
struct mbuf *m;
if (sopt->sopt_valsize > MLEN) {
error = EMSGSIZE;
break;
}
m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
if (m == NULL) {
error = ENOBUFS;
break;
}
m->m_len = sopt->sopt_valsize;
error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
m->m_len);
if (error) {
m_free(m);
break;
}
INP_WLOCK(inp);
error = ip_pcbopts(inp, sopt->sopt_name, m);
INP_WUNLOCK(inp);
return (error);
}
case IP_BINDANY:
if (sopt->sopt_td != NULL) {
error = priv_check(sopt->sopt_td,
PRIV_NETINET_BINDANY);
if (error)
break;
}
/* FALLTHROUGH */
case IP_BINDMULTI:
#ifdef RSS
case IP_RSS_LISTEN_BUCKET:
#endif
case IP_TOS:
case IP_TTL:
case IP_MINTTL:
case IP_RECVOPTS:
case IP_RECVRETOPTS:
case IP_ORIGDSTADDR:
case IP_RECVDSTADDR:
case IP_RECVTTL:
case IP_RECVIF:
case IP_ONESBCAST:
case IP_DONTFRAG:
case IP_RECVTOS:
case IP_RECVFLOWID:
#ifdef RSS
case IP_RECVRSSBUCKETID:
#endif
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
break;
switch (sopt->sopt_name) {
case IP_TOS:
inp->inp_ip_tos = optval;
break;
case IP_TTL:
inp->inp_ip_ttl = optval;
break;
case IP_MINTTL:
if (optval >= 0 && optval <= MAXTTL)
inp->inp_ip_minttl = optval;
else
error = EINVAL;
break;
#define OPTSET(bit) do { \
INP_WLOCK(inp); \
if (optval) \
inp->inp_flags |= bit; \
else \
inp->inp_flags &= ~bit; \
INP_WUNLOCK(inp); \
} while (0)
#define OPTSET2(bit, val) do { \
INP_WLOCK(inp); \
if (val) \
inp->inp_flags2 |= bit; \
else \
inp->inp_flags2 &= ~bit; \
INP_WUNLOCK(inp); \
} while (0)
case IP_RECVOPTS:
OPTSET(INP_RECVOPTS);
break;
case IP_RECVRETOPTS:
OPTSET(INP_RECVRETOPTS);
break;
case IP_RECVDSTADDR:
OPTSET(INP_RECVDSTADDR);
break;
case IP_ORIGDSTADDR:
OPTSET2(INP_ORIGDSTADDR, optval);
break;
case IP_RECVTTL:
OPTSET(INP_RECVTTL);
break;
case IP_RECVIF:
OPTSET(INP_RECVIF);
break;
case IP_ONESBCAST:
OPTSET(INP_ONESBCAST);
break;
case IP_DONTFRAG:
OPTSET(INP_DONTFRAG);
break;
case IP_BINDANY:
OPTSET(INP_BINDANY);
break;
case IP_RECVTOS:
OPTSET(INP_RECVTOS);
break;
case IP_BINDMULTI:
OPTSET2(INP_BINDMULTI, optval);
break;
case IP_RECVFLOWID:
OPTSET2(INP_RECVFLOWID, optval);
break;
#ifdef RSS
case IP_RSS_LISTEN_BUCKET:
if ((optval >= 0) &&
(optval < rss_getnumbuckets())) {
inp->inp_rss_listen_bucket = optval;
OPTSET2(INP_RSS_BUCKET_SET, 1);
} else {
error = EINVAL;
}
break;
case IP_RECVRSSBUCKETID:
OPTSET2(INP_RECVRSSBUCKETID, optval);
break;
#endif
}
break;
#undef OPTSET
#undef OPTSET2
/*
* Multicast socket options are processed by the in_mcast
* module.
*/
case IP_MULTICAST_IF:
case IP_MULTICAST_VIF:
case IP_MULTICAST_TTL:
case IP_MULTICAST_LOOP:
case IP_ADD_MEMBERSHIP:
case IP_DROP_MEMBERSHIP:
case IP_ADD_SOURCE_MEMBERSHIP:
case IP_DROP_SOURCE_MEMBERSHIP:
case IP_BLOCK_SOURCE:
case IP_UNBLOCK_SOURCE:
case IP_MSFILTER:
case MCAST_JOIN_GROUP:
case MCAST_LEAVE_GROUP:
case MCAST_JOIN_SOURCE_GROUP:
case MCAST_LEAVE_SOURCE_GROUP:
case MCAST_BLOCK_SOURCE:
case MCAST_UNBLOCK_SOURCE:
error = inp_setmoptions(inp, sopt);
break;
case IP_PORTRANGE:
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
break;
INP_WLOCK(inp);
switch (optval) {
case IP_PORTRANGE_DEFAULT:
inp->inp_flags &= ~(INP_LOWPORT);
inp->inp_flags &= ~(INP_HIGHPORT);
break;
case IP_PORTRANGE_HIGH:
inp->inp_flags &= ~(INP_LOWPORT);
inp->inp_flags |= INP_HIGHPORT;
break;
case IP_PORTRANGE_LOW:
inp->inp_flags &= ~(INP_HIGHPORT);
inp->inp_flags |= INP_LOWPORT;
break;
default:
error = EINVAL;
break;
}
INP_WUNLOCK(inp);
break;
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
case IP_IPSEC_POLICY:
if (IPSEC_ENABLED(ipv4)) {
error = IPSEC_PCBCTL(ipv4, inp, sopt);
break;
}
/* FALLTHROUGH */
#endif /* IPSEC */
default:
error = ENOPROTOOPT;
break;
}
break;
case SOPT_GET:
switch (sopt->sopt_name) {
case IP_OPTIONS:
case IP_RETOPTS:
INP_RLOCK(inp);
if (inp->inp_options) {
struct mbuf *options;
options = m_copym(inp->inp_options, 0,
M_COPYALL, M_NOWAIT);
INP_RUNLOCK(inp);
if (options != NULL) {
error = sooptcopyout(sopt,
mtod(options, char *),
options->m_len);
m_freem(options);
} else
error = ENOMEM;
} else {
INP_RUNLOCK(inp);
sopt->sopt_valsize = 0;
}
break;
case IP_TOS:
case IP_TTL:
case IP_MINTTL:
case IP_RECVOPTS:
case IP_RECVRETOPTS:
case IP_ORIGDSTADDR:
case IP_RECVDSTADDR:
case IP_RECVTTL:
case IP_RECVIF:
case IP_PORTRANGE:
case IP_ONESBCAST:
case IP_DONTFRAG:
case IP_BINDANY:
case IP_RECVTOS:
case IP_BINDMULTI:
case IP_FLOWID:
case IP_FLOWTYPE:
case IP_RECVFLOWID:
#ifdef RSS
case IP_RSSBUCKETID:
case IP_RECVRSSBUCKETID:
#endif
switch (sopt->sopt_name) {
case IP_TOS:
optval = inp->inp_ip_tos;
break;
case IP_TTL:
optval = inp->inp_ip_ttl;
break;
case IP_MINTTL:
optval = inp->inp_ip_minttl;
break;
#define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
#define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0)
case IP_RECVOPTS:
optval = OPTBIT(INP_RECVOPTS);
break;
case IP_RECVRETOPTS:
optval = OPTBIT(INP_RECVRETOPTS);
break;
case IP_RECVDSTADDR:
optval = OPTBIT(INP_RECVDSTADDR);
break;
case IP_ORIGDSTADDR:
optval = OPTBIT2(INP_ORIGDSTADDR);
break;
case IP_RECVTTL:
optval = OPTBIT(INP_RECVTTL);
break;
case IP_RECVIF:
optval = OPTBIT(INP_RECVIF);
break;
case IP_PORTRANGE:
if (inp->inp_flags & INP_HIGHPORT)
optval = IP_PORTRANGE_HIGH;
else if (inp->inp_flags & INP_LOWPORT)
optval = IP_PORTRANGE_LOW;
else
optval = 0;
break;
case IP_ONESBCAST:
optval = OPTBIT(INP_ONESBCAST);
break;
case IP_DONTFRAG:
optval = OPTBIT(INP_DONTFRAG);
break;
case IP_BINDANY:
optval = OPTBIT(INP_BINDANY);
break;
case IP_RECVTOS:
optval = OPTBIT(INP_RECVTOS);
break;
case IP_FLOWID:
optval = inp->inp_flowid;
break;
case IP_FLOWTYPE:
optval = inp->inp_flowtype;
break;
case IP_RECVFLOWID:
optval = OPTBIT2(INP_RECVFLOWID);
break;
#ifdef RSS
case IP_RSSBUCKETID:
retval = rss_hash2bucket(inp->inp_flowid,
inp->inp_flowtype,
&rss_bucket);
if (retval == 0)
optval = rss_bucket;
else
error = EINVAL;
break;
case IP_RECVRSSBUCKETID:
optval = OPTBIT2(INP_RECVRSSBUCKETID);
break;
#endif
case IP_BINDMULTI:
optval = OPTBIT2(INP_BINDMULTI);
break;
}
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
/*
* Multicast socket options are processed by the in_mcast
* module.
*/
case IP_MULTICAST_IF:
case IP_MULTICAST_VIF:
case IP_MULTICAST_TTL:
case IP_MULTICAST_LOOP:
case IP_MSFILTER:
error = inp_getmoptions(inp, sopt);
break;
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
case IP_IPSEC_POLICY:
if (IPSEC_ENABLED(ipv4)) {
error = IPSEC_PCBCTL(ipv4, inp, sopt);
break;
}
/* FALLTHROUGH */
#endif /* IPSEC */
default:
error = ENOPROTOOPT;
break;
}
break;
}
return (error);
}
/*
* Routine called from ip_output() to loop back a copy of an IP multicast
* packet to the input queue of a specified interface. Note that this
* calls the output routine of the loopback "driver", but with an interface
* pointer that might NOT be a loopback interface -- evil, but easier than
* replicating that code here.
*/
static void
ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
{
struct ip *ip;
struct mbuf *copym;
/*
* Make a deep copy of the packet because we're going to
* modify the pack in order to generate checksums.
*/
copym = m_dup(m, M_NOWAIT);
if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
copym = m_pullup(copym, hlen);
if (copym != NULL) {
/* If needed, compute the checksum and mark it as valid. */
if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
in_delayed_cksum(copym);
copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
copym->m_pkthdr.csum_flags |=
CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
copym->m_pkthdr.csum_data = 0xffff;
}
/*
* We don't bother to fragment if the IP length is greater
* than the interface's MTU. Can this possibly matter?
*/
ip = mtod(copym, struct ip *);
ip->ip_sum = 0;
ip->ip_sum = in_cksum(copym, hlen);
if_simloop(ifp, copym, AF_INET, 0);
}
}
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