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Diffstat (limited to 'freebsd/sys/netinet6/in6_gif.c')
-rw-r--r--freebsd/sys/netinet6/in6_gif.c337
1 files changed, 267 insertions, 70 deletions
diff --git a/freebsd/sys/netinet6/in6_gif.c b/freebsd/sys/netinet6/in6_gif.c
index 160a0929..66b4c63a 100644
--- a/freebsd/sys/netinet6/in6_gif.c
+++ b/freebsd/sys/netinet6/in6_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
@@ -40,20 +41,19 @@ __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/queue.h>
#include <sys/syslog.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>
@@ -63,52 +63,189 @@ __FBSDID("$FreeBSD$");
#include <netinet/in_systm.h>
#ifdef INET
#include <netinet/ip.h>
+#include <netinet/ip_ecn.h>
#endif
#include <netinet/ip_encap.h>
-#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_var.h>
-#endif
-#include <netinet/ip_ecn.h>
-#ifdef INET6
+#include <netinet6/scope6_var.h>
#include <netinet6/ip6_ecn.h>
#include <netinet6/in6_fib.h>
-#endif
#include <net/if_gif.h>
#define GIF_HLIM 30
-static VNET_DEFINE(int, ip6_gif_hlim) = GIF_HLIM;
+VNET_DEFINE_STATIC(int, ip6_gif_hlim) = GIF_HLIM;
#define V_ip6_gif_hlim VNET(ip6_gif_hlim)
SYSCTL_DECL(_net_inet6_ip6);
-SYSCTL_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM, gifhlim, CTLFLAG_VNET | CTLFLAG_RW,
- &VNET_NAME(ip6_gif_hlim), 0, "");
-
-static int in6_gif_input(struct mbuf **, int *, int);
-
-extern struct domain inet6domain;
-static struct protosw in6_gif_protosw = {
- .pr_type = SOCK_RAW,
- .pr_domain = &inet6domain,
- .pr_protocol = 0, /* IPPROTO_IPV[46] */
- .pr_flags = PR_ATOMIC|PR_ADDR,
- .pr_input = in6_gif_input,
- .pr_output = rip6_output,
- .pr_ctloutput = rip6_ctloutput,
- .pr_usrreqs = &rip6_usrreqs
-};
+SYSCTL_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM, gifhlim,
+ CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_gif_hlim), 0,
+ "Default hop limit 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 *, ipv6_hashtbl) = NULL;
+VNET_DEFINE_STATIC(struct gif_list, ipv6_list) = CK_LIST_HEAD_INITIALIZER();
+#define V_ipv6_hashtbl VNET(ipv6_hashtbl)
+#define V_ipv6_list VNET(ipv6_list)
+
+#define GIF_HASH(src, dst) (V_ipv6_hashtbl[\
+ in6_gif_hashval((src), (dst)) & (GIF_HASH_SIZE - 1)])
+#define GIF_HASH_SC(sc) GIF_HASH(&(sc)->gif_ip6hdr->ip6_src,\
+ &(sc)->gif_ip6hdr->ip6_dst)
+static uint32_t
+in6_gif_hashval(const struct in6_addr *src, const struct in6_addr *dst)
+{
+ uint32_t ret;
+
+ ret = fnv_32_buf(src, sizeof(*src), FNV1_32_INIT);
+ return (fnv_32_buf(dst, sizeof(*dst), ret));
+}
+
+static int
+in6_gif_checkdup(const struct gif_softc *sc, const struct in6_addr *src,
+ const struct in6_addr *dst)
+{
+ struct gif_softc *tmp;
+
+ if (sc->gif_family == AF_INET6 &&
+ IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_src, src) &&
+ IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_dst, dst))
+ return (EEXIST);
+
+ CK_LIST_FOREACH(tmp, &GIF_HASH(src, dst), chain) {
+ if (tmp == sc)
+ continue;
+ if (IN6_ARE_ADDR_EQUAL(&tmp->gif_ip6hdr->ip6_src, src) &&
+ IN6_ARE_ADDR_EQUAL(&tmp->gif_ip6hdr->ip6_dst, dst))
+ return (EADDRNOTAVAIL);
+ }
+ return (0);
+}
+
+static void
+in6_gif_attach(struct gif_softc *sc)
+{
+
+ if (sc->gif_options & GIF_IGNORE_SOURCE)
+ CK_LIST_INSERT_HEAD(&V_ipv6_list, sc, chain);
+ else
+ CK_LIST_INSERT_HEAD(&GIF_HASH_SC(sc), sc, chain);
+}
+
+int
+in6_gif_setopts(struct gif_softc *sc, u_int options)
+{
+
+ /* NOTE: we are protected with gif_ioctl_sx lock */
+ MPASS(sc->gif_family == AF_INET6);
+ 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;
+ in6_gif_attach(sc);
+ }
+ return (0);
+}
+
+int
+in6_gif_ioctl(struct gif_softc *sc, u_long cmd, caddr_t data)
+{
+ struct in6_ifreq *ifr = (struct in6_ifreq *)data;
+ struct sockaddr_in6 *dst, *src;
+ struct ip6_hdr *ip6;
+ int error;
+
+ /* NOTE: we are protected with gif_ioctl_sx lock */
+ error = EINVAL;
+ switch (cmd) {
+ case SIOCSIFPHYADDR_IN6:
+ src = &((struct in6_aliasreq *)data)->ifra_addr;
+ dst = &((struct in6_aliasreq *)data)->ifra_dstaddr;
+
+ /* sanity checks */
+ if (src->sin6_family != dst->sin6_family ||
+ src->sin6_family != AF_INET6 ||
+ src->sin6_len != dst->sin6_len ||
+ src->sin6_len != sizeof(*src))
+ break;
+ if (IN6_IS_ADDR_UNSPECIFIED(&src->sin6_addr) ||
+ IN6_IS_ADDR_UNSPECIFIED(&dst->sin6_addr)) {
+ error = EADDRNOTAVAIL;
+ break;
+ }
+ /*
+ * Check validity of the scope zone ID of the
+ * addresses, and convert it into the kernel
+ * internal form if necessary.
+ */
+ if ((error = sa6_embedscope(src, 0)) != 0 ||
+ (error = sa6_embedscope(dst, 0)) != 0)
+ break;
+
+ if (V_ipv6_hashtbl == NULL)
+ V_ipv6_hashtbl = gif_hashinit();
+ error = in6_gif_checkdup(sc, &src->sin6_addr,
+ &dst->sin6_addr);
+ if (error == EADDRNOTAVAIL)
+ break;
+ if (error == EEXIST) {
+ /* Addresses are the same. Just return. */
+ error = 0;
+ break;
+ }
+ ip6 = malloc(sizeof(*ip6), M_GIF, M_WAITOK | M_ZERO);
+ ip6->ip6_src = src->sin6_addr;
+ ip6->ip6_dst = dst->sin6_addr;
+ ip6->ip6_vfc = IPV6_VERSION;
+ 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_INET6;
+ sc->gif_ip6hdr = ip6;
+ in6_gif_attach(sc);
+ break;
+ case SIOCGIFPSRCADDR_IN6:
+ case SIOCGIFPDSTADDR_IN6:
+ if (sc->gif_family != AF_INET6) {
+ error = EADDRNOTAVAIL;
+ break;
+ }
+ src = (struct sockaddr_in6 *)&ifr->ifr_addr;
+ memset(src, 0, sizeof(*src));
+ src->sin6_family = AF_INET6;
+ src->sin6_len = sizeof(*src);
+ src->sin6_addr = (cmd == SIOCGIFPSRCADDR_IN6) ?
+ sc->gif_ip6hdr->ip6_src: sc->gif_ip6hdr->ip6_dst;
+ error = prison_if(curthread->td_ucred, (struct sockaddr *)src);
+ if (error == 0)
+ error = sa6_recoverscope(src);
+ if (error != 0)
+ memset(src, 0, sizeof(*src));
+ break;
+ }
+ return (error);
+}
int
in6_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
{
- GIF_RLOCK_TRACKER;
struct gif_softc *sc = ifp->if_softc;
struct ip6_hdr *ip6;
int len;
/* prepend new IP header */
+ MPASS(in_epoch(net_epoch_preempt));
len = sizeof(struct ip6_hdr);
#ifndef __NO_STRICT_ALIGNMENT
if (proto == IPPROTO_ETHERIP)
@@ -128,14 +265,8 @@ in6_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
#endif
ip6 = mtod(m, struct ip6_hdr *);
- GIF_RLOCK(sc);
- if (sc->gif_family != AF_INET6) {
- m_freem(m);
- GIF_RUNLOCK(sc);
- return (ENETDOWN);
- }
+ MPASS(sc->gif_family == AF_INET6);
bcopy(sc->gif_ip6hdr, ip6, sizeof(struct ip6_hdr));
- GIF_RUNLOCK(sc);
ip6->ip6_flow |= htonl((uint32_t)ecn << 20);
ip6->ip6_nxt = proto;
@@ -149,15 +280,14 @@ in6_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
}
static int
-in6_gif_input(struct mbuf **mp, int *offp, int proto)
+in6_gif_input(struct mbuf *m, int off, int proto, void *arg)
{
- struct mbuf *m = *mp;
+ struct gif_softc *sc = arg;
struct ifnet *gifp;
- struct gif_softc *sc;
struct ip6_hdr *ip6;
uint8_t ecn;
- sc = encap_getarg(m);
+ MPASS(in_epoch(net_epoch_preempt));
if (sc == NULL) {
m_freem(m);
IP6STAT_INC(ip6s_nogif);
@@ -167,7 +297,7 @@ in6_gif_input(struct mbuf **mp, int *offp, int proto)
if ((gifp->if_flags & IFF_UP) != 0) {
ip6 = mtod(m, struct ip6_hdr *);
ecn = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
- m_adj(m, *offp);
+ m_adj(m, off);
gif_input(m, gifp, proto, ecn);
} else {
m_freem(m);
@@ -176,59 +306,126 @@ in6_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
-in6_gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
+static int
+in6_gif_lookup(const struct mbuf *m, int off, int proto, void **arg)
{
const struct ip6_hdr *ip6;
struct gif_softc *sc;
int ret;
- /* sanity check done in caller */
- sc = (struct gif_softc *)arg;
- GIF_RLOCK_ASSERT(sc);
+ if (V_ipv6_hashtbl == NULL)
+ return (0);
+ MPASS(in_epoch(net_epoch_preempt));
/*
- * Check for address match. Note that the check is for an incoming
- * packet. We should compare the *source* address in our configuration
- * and the *destination* address of the packet, and vice versa.
+ * 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.
*/
ip6 = mtod(m, const struct ip6_hdr *);
- if (!IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_src, &ip6->ip6_dst))
+ ret = 0;
+ CK_LIST_FOREACH(sc, &GIF_HASH(&ip6->ip6_dst, &ip6->ip6_src), chain) {
+ /*
+ * This is an inbound packet, its ip6_dst is source address
+ * in softc.
+ */
+ if (IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_src,
+ &ip6->ip6_dst) &&
+ IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_dst,
+ &ip6->ip6_src)) {
+ ret = ENCAP_DRV_LOOKUP;
+ goto done;
+ }
+ }
+ /*
+ * No exact match.
+ * Check the list of interfaces with GIF_IGNORE_SOURCE flag.
+ */
+ CK_LIST_FOREACH(sc, &V_ipv6_list, chain) {
+ if (IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_src,
+ &ip6->ip6_dst)) {
+ ret = 128 + 8; /* src + proto */
+ goto done;
+ }
+ }
+ return (0);
+done:
+ if ((GIF2IFP(sc)->if_flags & IFF_UP) == 0)
return (0);
- ret = 128;
- if (!IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_dst, &ip6->ip6_src)) {
- if ((sc->gif_options & GIF_IGNORE_SOURCE) == 0)
- return (0);
- } else
- ret += 128;
-
/* ingress filters on outer source */
if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0) {
struct nhop6_basic nh6;
- /* XXX empty scope id */
- if (fib6_lookup_nh_basic(sc->gif_fibnum, &ip6->ip6_src, 0, 0, 0,
- &nh6) != 0)
+ if (fib6_lookup_nh_basic(sc->gif_fibnum, &ip6->ip6_src,
+ ntohs(in6_getscope(&ip6->ip6_src)), 0, 0, &nh6) != 0)
return (0);
if (nh6.nh_ifp != m->m_pkthdr.rcvif)
return (0);
}
+ *arg = sc;
return (ret);
}
-int
-in6_gif_attach(struct gif_softc *sc)
+static struct {
+ const struct encap_config encap;
+ const struct encaptab *cookie;
+} ipv6_encap_cfg[] = {
+#ifdef INET
+ {
+ .encap = {
+ .proto = IPPROTO_IPV4,
+ .min_length = sizeof(struct ip6_hdr) +
+ sizeof(struct ip),
+ .exact_match = ENCAP_DRV_LOOKUP,
+ .lookup = in6_gif_lookup,
+ .input = in6_gif_input
+ },
+ },
+#endif
+ {
+ .encap = {
+ .proto = IPPROTO_IPV6,
+ .min_length = 2 * sizeof(struct ip6_hdr),
+ .exact_match = ENCAP_DRV_LOOKUP,
+ .lookup = in6_gif_lookup,
+ .input = in6_gif_input
+ },
+ },
+ {
+ .encap = {
+ .proto = IPPROTO_ETHERIP,
+ .min_length = sizeof(struct ip6_hdr) +
+ sizeof(struct etherip_header) +
+ sizeof(struct ether_header),
+ .exact_match = ENCAP_DRV_LOOKUP,
+ .lookup = in6_gif_lookup,
+ .input = in6_gif_input
+ },
+ }
+};
+
+void
+in6_gif_init(void)
{
+ int i;
- KASSERT(sc->gif_ecookie == NULL, ("gif_ecookie isn't NULL"));
- sc->gif_ecookie = encap_attach_func(AF_INET6, -1, gif_encapcheck,
- (void *)&in6_gif_protosw, sc);
- if (sc->gif_ecookie == NULL)
- return (EEXIST);
- return (0);
+ if (!IS_DEFAULT_VNET(curvnet))
+ return;
+ for (i = 0; i < nitems(ipv6_encap_cfg); i++)
+ ipv6_encap_cfg[i].cookie = ip6_encap_attach(
+ &ipv6_encap_cfg[i].encap, NULL, M_WAITOK);
+}
+
+void
+in6_gif_uninit(void)
+{
+ int i;
+
+ if (IS_DEFAULT_VNET(curvnet)) {
+ for (i = 0; i < nitems(ipv6_encap_cfg); i++)
+ ip6_encap_detach(ipv6_encap_cfg[i].cookie);
+ }
+ if (V_ipv6_hashtbl != NULL)
+ gif_hashdestroy(V_ipv6_hashtbl);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-27 18:16:05 +0000