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Diffstat (limited to 'freebsd/sys/netinet/in_gif.c')
-rw-r--r--freebsd/sys/netinet/in_gif.c311
1 files changed, 250 insertions, 61 deletions
diff --git a/freebsd/sys/netinet/in_gif.c b/freebsd/sys/netinet/in_gif.c
index d072161f..03aaaf08 100644
--- a/freebsd/sys/netinet/in_gif.c
+++ b/freebsd/sys/netinet/in_gif.c
@@ -4,6 +4,7 @@
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * Copyright (c) 2018 Andrey V. Elsukov <ae@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -40,18 +41,18 @@ __FBSDID("$FreeBSD$");
#include <rtems/bsd/local/opt_inet6.h>
#include <sys/param.h>
-#include <sys/lock.h>
-#include <sys/rmlock.h>
#include <sys/systm.h>
+#include <sys/jail.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 <sys/proc.h>
+#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/route.h>
@@ -72,35 +73,161 @@ __FBSDID("$FreeBSD$");
#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;
+VNET_DEFINE_STATIC(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, "");
+ &VNET_NAME(ip_gif_ttl), 0, "Default TTL value for encapsulated packets");
+
+/*
+ * We keep interfaces in a hash table using src+dst as key.
+ * Interfaces with GIF_IGNORE_SOURCE flag are linked into plain list.
+ */
+VNET_DEFINE_STATIC(struct gif_list *, ipv4_hashtbl) = NULL;
+VNET_DEFINE_STATIC(struct gif_list, ipv4_list) = CK_LIST_HEAD_INITIALIZER();
+#define V_ipv4_hashtbl VNET(ipv4_hashtbl)
+#define V_ipv4_list VNET(ipv4_list)
+
+#define GIF_HASH(src, dst) (V_ipv4_hashtbl[\
+ in_gif_hashval((src), (dst)) & (GIF_HASH_SIZE - 1)])
+#define GIF_HASH_SC(sc) GIF_HASH((sc)->gif_iphdr->ip_src.s_addr,\
+ (sc)->gif_iphdr->ip_dst.s_addr)
+static uint32_t
+in_gif_hashval(in_addr_t src, in_addr_t dst)
+{
+ uint32_t ret;
+
+ ret = fnv_32_buf(&src, sizeof(src), FNV1_32_INIT);
+ return (fnv_32_buf(&dst, sizeof(dst), ret));
+}
+
+static int
+in_gif_checkdup(const struct gif_softc *sc, in_addr_t src, in_addr_t dst)
+{
+ struct gif_softc *tmp;
+
+ if (sc->gif_family == AF_INET &&
+ sc->gif_iphdr->ip_src.s_addr == src &&
+ sc->gif_iphdr->ip_dst.s_addr == dst)
+ return (EEXIST);
+
+ CK_LIST_FOREACH(tmp, &GIF_HASH(src, dst), chain) {
+ if (tmp == sc)
+ continue;
+ if (tmp->gif_iphdr->ip_src.s_addr == src &&
+ tmp->gif_iphdr->ip_dst.s_addr == dst)
+ return (EADDRNOTAVAIL);
+ }
+ return (0);
+}
+
+static void
+in_gif_attach(struct gif_softc *sc)
+{
+
+ if (sc->gif_options & GIF_IGNORE_SOURCE)
+ CK_LIST_INSERT_HEAD(&V_ipv4_list, sc, chain);
+ else
+ CK_LIST_INSERT_HEAD(&GIF_HASH_SC(sc), sc, chain);
+}
+
+int
+in_gif_setopts(struct gif_softc *sc, u_int options)
+{
+
+ /* NOTE: we are protected with gif_ioctl_sx lock */
+ MPASS(sc->gif_family == AF_INET);
+ MPASS(sc->gif_options != options);
+
+ if ((options & GIF_IGNORE_SOURCE) !=
+ (sc->gif_options & GIF_IGNORE_SOURCE)) {
+ CK_LIST_REMOVE(sc, chain);
+ sc->gif_options = options;
+ in_gif_attach(sc);
+ }
+ return (0);
+}
+
+int
+in_gif_ioctl(struct gif_softc *sc, u_long cmd, caddr_t data)
+{
+ struct ifreq *ifr = (struct ifreq *)data;
+ struct sockaddr_in *dst, *src;
+ struct ip *ip;
+ int error;
+
+ /* NOTE: we are protected with gif_ioctl_sx lock */
+ error = EINVAL;
+ switch (cmd) {
+ case SIOCSIFPHYADDR:
+ src = &((struct in_aliasreq *)data)->ifra_addr;
+ dst = &((struct in_aliasreq *)data)->ifra_dstaddr;
+
+ /* sanity checks */
+ if (src->sin_family != dst->sin_family ||
+ src->sin_family != AF_INET ||
+ src->sin_len != dst->sin_len ||
+ src->sin_len != sizeof(*src))
+ break;
+ if (src->sin_addr.s_addr == INADDR_ANY ||
+ dst->sin_addr.s_addr == INADDR_ANY) {
+ error = EADDRNOTAVAIL;
+ break;
+ }
+ if (V_ipv4_hashtbl == NULL)
+ V_ipv4_hashtbl = gif_hashinit();
+ error = in_gif_checkdup(sc, src->sin_addr.s_addr,
+ dst->sin_addr.s_addr);
+ if (error == EADDRNOTAVAIL)
+ break;
+ if (error == EEXIST) {
+ /* Addresses are the same. Just return. */
+ error = 0;
+ break;
+ }
+ ip = malloc(sizeof(*ip), M_GIF, M_WAITOK | M_ZERO);
+ ip->ip_src.s_addr = src->sin_addr.s_addr;
+ ip->ip_dst.s_addr = dst->sin_addr.s_addr;
+ if (sc->gif_family != 0) {
+ /* Detach existing tunnel first */
+ CK_LIST_REMOVE(sc, chain);
+ GIF_WAIT();
+ free(sc->gif_hdr, M_GIF);
+ /* XXX: should we notify about link state change? */
+ }
+ sc->gif_family = AF_INET;
+ sc->gif_iphdr = ip;
+ in_gif_attach(sc);
+ break;
+ case SIOCGIFPSRCADDR:
+ case SIOCGIFPDSTADDR:
+ if (sc->gif_family != AF_INET) {
+ error = EADDRNOTAVAIL;
+ break;
+ }
+ src = (struct sockaddr_in *)&ifr->ifr_addr;
+ memset(src, 0, sizeof(*src));
+ src->sin_family = AF_INET;
+ src->sin_len = sizeof(*src);
+ src->sin_addr = (cmd == SIOCGIFPSRCADDR) ?
+ sc->gif_iphdr->ip_src: sc->gif_iphdr->ip_dst;
+ error = prison_if(curthread->td_ucred, (struct sockaddr *)src);
+ if (error != 0)
+ memset(src, 0, sizeof(*src));
+ break;
+ }
+ return (error);
+}
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 */
+ MPASS(in_epoch(net_epoch_preempt));
len = sizeof(struct ip);
#ifndef __NO_STRICT_ALIGNMENT
if (proto == IPPROTO_ETHERIP)
@@ -119,15 +246,9 @@ in_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
}
#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);
+ MPASS(sc->gif_family == AF_INET);
+ bcopy(sc->gif_iphdr, ip, sizeof(struct ip));
ip->ip_p = proto;
/* version will be set in ip_output() */
ip->ip_ttl = V_ip_gif_ttl;
@@ -138,15 +259,14 @@ in_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
}
static int
-in_gif_input(struct mbuf **mp, int *offp, int proto)
+in_gif_input(struct mbuf *m, int off, int proto, void *arg)
{
- struct mbuf *m = *mp;
- struct gif_softc *sc;
+ struct gif_softc *sc = arg;
struct ifnet *gifp;
struct ip *ip;
uint8_t ecn;
- sc = encap_getarg(m);
+ MPASS(in_epoch(net_epoch_preempt));
if (sc == NULL) {
m_freem(m);
KMOD_IPSTAT_INC(ips_nogif);
@@ -156,7 +276,7 @@ in_gif_input(struct mbuf **mp, int *offp, int proto)
if ((gifp->if_flags & IFF_UP) != 0) {
ip = mtod(m, struct ip *);
ecn = ip->ip_tos;
- m_adj(m, *offp);
+ m_adj(m, off);
gif_input(m, gifp, proto, ecn);
} else {
m_freem(m);
@@ -165,56 +285,125 @@ in_gif_input(struct mbuf **mp, int *offp, int proto)
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)
+static int
+in_gif_lookup(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);
+ if (V_ipv4_hashtbl == NULL)
+ return (0);
- /* check for address match */
+ MPASS(in_epoch(net_epoch_preempt));
ip = mtod(m, const struct ip *);
- if (sc->gif_iphdr->ip_src.s_addr != ip->ip_dst.s_addr)
+ /*
+ * NOTE: it is safe to iterate without any locking here, because softc
+ * can be reclaimed only when we are not within net_epoch_preempt
+ * section, but ip_encap lookup+input are executed in epoch section.
+ */
+ ret = 0;
+ CK_LIST_FOREACH(sc, &GIF_HASH(ip->ip_dst.s_addr,
+ ip->ip_src.s_addr), chain) {
+ /*
+ * This is an inbound packet, its ip_dst is source address
+ * in softc.
+ */
+ if (sc->gif_iphdr->ip_src.s_addr == ip->ip_dst.s_addr &&
+ sc->gif_iphdr->ip_dst.s_addr == ip->ip_src.s_addr) {
+ ret = ENCAP_DRV_LOOKUP;
+ goto done;
+ }
+ }
+ /*
+ * No exact match.
+ * Check the list of interfaces with GIF_IGNORE_SOURCE flag.
+ */
+ CK_LIST_FOREACH(sc, &V_ipv4_list, chain) {
+ if (sc->gif_iphdr->ip_src.s_addr == ip->ip_dst.s_addr) {
+ ret = 32 + 8; /* src + proto */
+ goto done;
+ }
+ }
+ return (0);
+done:
+ if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0)
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);
}
+ *arg = sc;
return (ret);
}
-int
-in_gif_attach(struct gif_softc *sc)
+static struct {
+ const struct encap_config encap;
+ const struct encaptab *cookie;
+} ipv4_encap_cfg[] = {
+ {
+ .encap = {
+ .proto = IPPROTO_IPV4,
+ .min_length = 2 * sizeof(struct ip),
+ .exact_match = ENCAP_DRV_LOOKUP,
+ .lookup = in_gif_lookup,
+ .input = in_gif_input
+ },
+ },
+#ifdef INET6
+ {
+ .encap = {
+ .proto = IPPROTO_IPV6,
+ .min_length = sizeof(struct ip) +
+ sizeof(struct ip6_hdr),
+ .exact_match = ENCAP_DRV_LOOKUP,
+ .lookup = in_gif_lookup,
+ .input = in_gif_input
+ },
+ },
+#endif
+ {
+ .encap = {
+ .proto = IPPROTO_ETHERIP,
+ .min_length = sizeof(struct ip) +
+ sizeof(struct etherip_header) +
+ sizeof(struct ether_header),
+ .exact_match = ENCAP_DRV_LOOKUP,
+ .lookup = in_gif_lookup,
+ .input = in_gif_input
+ },
+ }
+};
+
+void
+in_gif_init(void)
{
+ int i;
- 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);
+ if (!IS_DEFAULT_VNET(curvnet))
+ return;
+ for (i = 0; i < nitems(ipv4_encap_cfg); i++)
+ ipv4_encap_cfg[i].cookie = ip_encap_attach(
+ &ipv4_encap_cfg[i].encap, NULL, M_WAITOK);
+}
+
+void
+in_gif_uninit(void)
+{
+ int i;
+
+ if (IS_DEFAULT_VNET(curvnet)) {
+ for (i = 0; i < nitems(ipv4_encap_cfg); i++)
+ ip_encap_detach(ipv4_encap_cfg[i].cookie);
+ }
+ if (V_ipv4_hashtbl != NULL)
+ gif_hashdestroy(V_ipv4_hashtbl);
}
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-28 17:37:59 +0000