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mirror of https://git.FreeBSD.org/src.git synced 2024-12-24 11:29:10 +00:00
freebsd/sys/netinet/in_gif.c
Alexander V. Chernikov 65ff3638df Merge helper fib* functions used for basic lookups.
Vast majority of rtalloc(9) users require only basic info from
route table (e.g. "does the rtentry interface match with the interface
  I have?". "what is the MTU?", "Give me the IPv4 source address to use",
  etc..).
Instead of hand-rolling lookups, checking if rtentry is up, valid,
  dealing with IPv6 mtu, finding "address" ifp (almost never done right),
  provide easy-to-use API hiding all the complexity and returning the
  needed info into small on-stack structure.

This change also helps hiding route subsystem internals (locking, direct
  rtentry accesses).
Additionaly, using this API improves lookup performance since rtentry is not
  locked.
(This is safe, since all the rtentry changes happens under both radix WLOCK
  and rtentry WLOCK).

Sponsored by:	Yandex LLC
2015-12-08 10:50:03 +00:00

217 lines
5.6 KiB
C

/*-
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* 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 project 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 PROJECT 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 PROJECT 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.
*
* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/rmlock.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/protosw.h>
#include <sys/malloc.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/route.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in_var.h>
#include <netinet/ip_encap.h>
#include <netinet/ip_ecn.h>
#include <netinet/in_fib.h>
#ifdef INET6
#include <netinet/ip6.h>
#endif
#include <net/if_gif.h>
static int in_gif_input(struct mbuf **, int *, int);
extern struct domain inetdomain;
static struct protosw in_gif_protosw = {
.pr_type = SOCK_RAW,
.pr_domain = &inetdomain,
.pr_protocol = 0/* IPPROTO_IPV[46] */,
.pr_flags = PR_ATOMIC|PR_ADDR,
.pr_input = in_gif_input,
.pr_output = rip_output,
.pr_ctloutput = rip_ctloutput,
.pr_usrreqs = &rip_usrreqs
};
#define GIF_TTL 30
static VNET_DEFINE(int, ip_gif_ttl) = GIF_TTL;
#define V_ip_gif_ttl VNET(ip_gif_ttl)
SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(ip_gif_ttl), 0, "");
int
in_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
{
GIF_RLOCK_TRACKER;
struct gif_softc *sc = ifp->if_softc;
struct ip *ip;
int len;
/* prepend new IP header */
len = sizeof(struct ip);
#ifndef __NO_STRICT_ALIGNMENT
if (proto == IPPROTO_ETHERIP)
len += ETHERIP_ALIGN;
#endif
M_PREPEND(m, len, M_NOWAIT);
if (m == NULL)
return (ENOBUFS);
#ifndef __NO_STRICT_ALIGNMENT
if (proto == IPPROTO_ETHERIP) {
len = mtod(m, vm_offset_t) & 3;
KASSERT(len == 0 || len == ETHERIP_ALIGN,
("in_gif_output: unexpected misalignment"));
m->m_data += len;
m->m_len -= ETHERIP_ALIGN;
}
#endif
ip = mtod(m, struct ip *);
GIF_RLOCK(sc);
if (sc->gif_family != AF_INET) {
m_freem(m);
GIF_RUNLOCK(sc);
return (ENETDOWN);
}
bcopy(sc->gif_iphdr, ip, sizeof(struct ip));
GIF_RUNLOCK(sc);
ip->ip_p = proto;
/* version will be set in ip_output() */
ip->ip_ttl = V_ip_gif_ttl;
ip->ip_len = htons(m->m_pkthdr.len);
ip->ip_tos = ecn;
return (ip_output(m, NULL, NULL, 0, NULL, NULL));
}
static int
in_gif_input(struct mbuf **mp, int *offp, int proto)
{
struct mbuf *m = *mp;
struct gif_softc *sc;
struct ifnet *gifp;
struct ip *ip;
uint8_t ecn;
sc = encap_getarg(m);
if (sc == NULL) {
m_freem(m);
KMOD_IPSTAT_INC(ips_nogif);
return (IPPROTO_DONE);
}
gifp = GIF2IFP(sc);
if ((gifp->if_flags & IFF_UP) != 0) {
ip = mtod(m, struct ip *);
ecn = ip->ip_tos;
m_adj(m, *offp);
gif_input(m, gifp, proto, ecn);
} else {
m_freem(m);
KMOD_IPSTAT_INC(ips_nogif);
}
return (IPPROTO_DONE);
}
/*
* we know that we are in IFF_UP, outer address available, and outer family
* matched the physical addr family. see gif_encapcheck().
*/
int
in_gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
{
const struct ip *ip;
struct gif_softc *sc;
int ret;
/* sanity check done in caller */
sc = (struct gif_softc *)arg;
GIF_RLOCK_ASSERT(sc);
/* check for address match */
ip = mtod(m, const struct ip *);
if (sc->gif_iphdr->ip_src.s_addr != ip->ip_dst.s_addr)
return (0);
ret = 32;
if (sc->gif_iphdr->ip_dst.s_addr != ip->ip_src.s_addr) {
if ((sc->gif_options & GIF_IGNORE_SOURCE) == 0)
return (0);
} else
ret += 32;
/* ingress filters on outer source */
if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0) {
struct nhop4_basic nh4;
struct in_addr dst;
dst = ip->ip_src;
if (fib4_lookup_nh_basic(sc->gif_fibnum, dst, 0, 0, &nh4) != 0)
return (0);
if (nh4.nh_ifp != m->m_pkthdr.rcvif)
return (0);
}
return (ret);
}
int
in_gif_attach(struct gif_softc *sc)
{
KASSERT(sc->gif_ecookie == NULL, ("gif_ecookie isn't NULL"));
sc->gif_ecookie = encap_attach_func(AF_INET, -1, gif_encapcheck,
&in_gif_protosw, sc);
if (sc->gif_ecookie == NULL)
return (EEXIST);
return (0);
}