mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 13:13:57 +08:00
1f3a8e49d8
No point in going through loops and hoops instead of just comparing the values. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org>
526 lines
13 KiB
C
526 lines
13 KiB
C
/*
|
|
* Copyright (C)2003-2006 Helsinki University of Technology
|
|
* Copyright (C)2003-2006 USAGI/WIDE Project
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
/*
|
|
* Authors:
|
|
* Noriaki TAKAMIYA @USAGI
|
|
* Masahide NAKAMURA @USAGI
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/time.h>
|
|
#include <linux/ipv6.h>
|
|
#include <linux/icmpv6.h>
|
|
#include <net/sock.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/ip6_checksum.h>
|
|
#include <net/rawv6.h>
|
|
#include <net/xfrm.h>
|
|
#include <net/mip6.h>
|
|
|
|
static inline unsigned int calc_padlen(unsigned int len, unsigned int n)
|
|
{
|
|
return (n - len + 16) & 0x7;
|
|
}
|
|
|
|
static inline void *mip6_padn(__u8 *data, __u8 padlen)
|
|
{
|
|
if (!data)
|
|
return NULL;
|
|
if (padlen == 1) {
|
|
data[0] = IPV6_TLV_PAD1;
|
|
} else if (padlen > 1) {
|
|
data[0] = IPV6_TLV_PADN;
|
|
data[1] = padlen - 2;
|
|
if (padlen > 2)
|
|
memset(data+2, 0, data[1]);
|
|
}
|
|
return data + padlen;
|
|
}
|
|
|
|
static inline void mip6_param_prob(struct sk_buff *skb, u8 code, int pos)
|
|
{
|
|
icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos);
|
|
}
|
|
|
|
static int mip6_mh_len(int type)
|
|
{
|
|
int len = 0;
|
|
|
|
switch (type) {
|
|
case IP6_MH_TYPE_BRR:
|
|
len = 0;
|
|
break;
|
|
case IP6_MH_TYPE_HOTI:
|
|
case IP6_MH_TYPE_COTI:
|
|
case IP6_MH_TYPE_BU:
|
|
case IP6_MH_TYPE_BACK:
|
|
len = 1;
|
|
break;
|
|
case IP6_MH_TYPE_HOT:
|
|
case IP6_MH_TYPE_COT:
|
|
case IP6_MH_TYPE_BERROR:
|
|
len = 2;
|
|
break;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
static int mip6_mh_filter(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct ip6_mh _hdr;
|
|
const struct ip6_mh *mh;
|
|
|
|
mh = skb_header_pointer(skb, skb_transport_offset(skb),
|
|
sizeof(_hdr), &_hdr);
|
|
if (!mh)
|
|
return -1;
|
|
|
|
if (((mh->ip6mh_hdrlen + 1) << 3) > skb->len)
|
|
return -1;
|
|
|
|
if (mh->ip6mh_hdrlen < mip6_mh_len(mh->ip6mh_type)) {
|
|
net_dbg_ratelimited("mip6: MH message too short: %d vs >=%d\n",
|
|
mh->ip6mh_hdrlen,
|
|
mip6_mh_len(mh->ip6mh_type));
|
|
mip6_param_prob(skb, 0, offsetof(struct ip6_mh, ip6mh_hdrlen) +
|
|
skb_network_header_len(skb));
|
|
return -1;
|
|
}
|
|
|
|
if (mh->ip6mh_proto != IPPROTO_NONE) {
|
|
net_dbg_ratelimited("mip6: MH invalid payload proto = %d\n",
|
|
mh->ip6mh_proto);
|
|
mip6_param_prob(skb, 0, offsetof(struct ip6_mh, ip6mh_proto) +
|
|
skb_network_header_len(skb));
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct mip6_report_rate_limiter {
|
|
spinlock_t lock;
|
|
ktime_t stamp;
|
|
int iif;
|
|
struct in6_addr src;
|
|
struct in6_addr dst;
|
|
};
|
|
|
|
static struct mip6_report_rate_limiter mip6_report_rl = {
|
|
.lock = __SPIN_LOCK_UNLOCKED(mip6_report_rl.lock)
|
|
};
|
|
|
|
static int mip6_destopt_input(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
const struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
struct ipv6_destopt_hdr *destopt = (struct ipv6_destopt_hdr *)skb->data;
|
|
int err = destopt->nexthdr;
|
|
|
|
spin_lock(&x->lock);
|
|
if (!ipv6_addr_equal(&iph->saddr, (struct in6_addr *)x->coaddr) &&
|
|
!ipv6_addr_any((struct in6_addr *)x->coaddr))
|
|
err = -ENOENT;
|
|
spin_unlock(&x->lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Destination Option Header is inserted.
|
|
* IP Header's src address is replaced with Home Address Option in
|
|
* Destination Option Header.
|
|
*/
|
|
static int mip6_destopt_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *iph;
|
|
struct ipv6_destopt_hdr *dstopt;
|
|
struct ipv6_destopt_hao *hao;
|
|
u8 nexthdr;
|
|
int len;
|
|
|
|
skb_push(skb, -skb_network_offset(skb));
|
|
iph = ipv6_hdr(skb);
|
|
|
|
nexthdr = *skb_mac_header(skb);
|
|
*skb_mac_header(skb) = IPPROTO_DSTOPTS;
|
|
|
|
dstopt = (struct ipv6_destopt_hdr *)skb_transport_header(skb);
|
|
dstopt->nexthdr = nexthdr;
|
|
|
|
hao = mip6_padn((char *)(dstopt + 1),
|
|
calc_padlen(sizeof(*dstopt), 6));
|
|
|
|
hao->type = IPV6_TLV_HAO;
|
|
BUILD_BUG_ON(sizeof(*hao) != 18);
|
|
hao->length = sizeof(*hao) - 2;
|
|
|
|
len = ((char *)hao - (char *)dstopt) + sizeof(*hao);
|
|
|
|
memcpy(&hao->addr, &iph->saddr, sizeof(hao->addr));
|
|
spin_lock_bh(&x->lock);
|
|
memcpy(&iph->saddr, x->coaddr, sizeof(iph->saddr));
|
|
spin_unlock_bh(&x->lock);
|
|
|
|
WARN_ON(len != x->props.header_len);
|
|
dstopt->hdrlen = (x->props.header_len >> 3) - 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int mip6_report_rl_allow(ktime_t stamp,
|
|
const struct in6_addr *dst,
|
|
const struct in6_addr *src, int iif)
|
|
{
|
|
int allow = 0;
|
|
|
|
spin_lock_bh(&mip6_report_rl.lock);
|
|
if (mip6_report_rl.stamp != stamp ||
|
|
mip6_report_rl.iif != iif ||
|
|
!ipv6_addr_equal(&mip6_report_rl.src, src) ||
|
|
!ipv6_addr_equal(&mip6_report_rl.dst, dst)) {
|
|
mip6_report_rl.stamp = stamp;
|
|
mip6_report_rl.iif = iif;
|
|
mip6_report_rl.src = *src;
|
|
mip6_report_rl.dst = *dst;
|
|
allow = 1;
|
|
}
|
|
spin_unlock_bh(&mip6_report_rl.lock);
|
|
return allow;
|
|
}
|
|
|
|
static int mip6_destopt_reject(struct xfrm_state *x, struct sk_buff *skb,
|
|
const struct flowi *fl)
|
|
{
|
|
struct net *net = xs_net(x);
|
|
struct inet6_skb_parm *opt = (struct inet6_skb_parm *)skb->cb;
|
|
const struct flowi6 *fl6 = &fl->u.ip6;
|
|
struct ipv6_destopt_hao *hao = NULL;
|
|
struct xfrm_selector sel;
|
|
int offset;
|
|
ktime_t stamp;
|
|
int err = 0;
|
|
|
|
if (unlikely(fl6->flowi6_proto == IPPROTO_MH &&
|
|
fl6->fl6_mh_type <= IP6_MH_TYPE_MAX))
|
|
goto out;
|
|
|
|
if (likely(opt->dsthao)) {
|
|
offset = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
|
|
if (likely(offset >= 0))
|
|
hao = (struct ipv6_destopt_hao *)
|
|
(skb_network_header(skb) + offset);
|
|
}
|
|
|
|
stamp = skb_get_ktime(skb);
|
|
|
|
if (!mip6_report_rl_allow(stamp, &ipv6_hdr(skb)->daddr,
|
|
hao ? &hao->addr : &ipv6_hdr(skb)->saddr,
|
|
opt->iif))
|
|
goto out;
|
|
|
|
memset(&sel, 0, sizeof(sel));
|
|
memcpy(&sel.daddr, (xfrm_address_t *)&ipv6_hdr(skb)->daddr,
|
|
sizeof(sel.daddr));
|
|
sel.prefixlen_d = 128;
|
|
memcpy(&sel.saddr, (xfrm_address_t *)&ipv6_hdr(skb)->saddr,
|
|
sizeof(sel.saddr));
|
|
sel.prefixlen_s = 128;
|
|
sel.family = AF_INET6;
|
|
sel.proto = fl6->flowi6_proto;
|
|
sel.dport = xfrm_flowi_dport(fl, &fl6->uli);
|
|
if (sel.dport)
|
|
sel.dport_mask = htons(~0);
|
|
sel.sport = xfrm_flowi_sport(fl, &fl6->uli);
|
|
if (sel.sport)
|
|
sel.sport_mask = htons(~0);
|
|
sel.ifindex = fl6->flowi6_oif;
|
|
|
|
err = km_report(net, IPPROTO_DSTOPTS, &sel,
|
|
(hao ? (xfrm_address_t *)&hao->addr : NULL));
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb,
|
|
u8 **nexthdr)
|
|
{
|
|
u16 offset = sizeof(struct ipv6hdr);
|
|
struct ipv6_opt_hdr *exthdr =
|
|
(struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
|
|
const unsigned char *nh = skb_network_header(skb);
|
|
unsigned int packet_len = skb_tail_pointer(skb) -
|
|
skb_network_header(skb);
|
|
int found_rhdr = 0;
|
|
|
|
*nexthdr = &ipv6_hdr(skb)->nexthdr;
|
|
|
|
while (offset + 1 <= packet_len) {
|
|
|
|
switch (**nexthdr) {
|
|
case NEXTHDR_HOP:
|
|
break;
|
|
case NEXTHDR_ROUTING:
|
|
found_rhdr = 1;
|
|
break;
|
|
case NEXTHDR_DEST:
|
|
/*
|
|
* HAO MUST NOT appear more than once.
|
|
* XXX: It is better to try to find by the end of
|
|
* XXX: packet if HAO exists.
|
|
*/
|
|
if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) {
|
|
net_dbg_ratelimited("mip6: hao exists already, override\n");
|
|
return offset;
|
|
}
|
|
|
|
if (found_rhdr)
|
|
return offset;
|
|
|
|
break;
|
|
default:
|
|
return offset;
|
|
}
|
|
|
|
offset += ipv6_optlen(exthdr);
|
|
*nexthdr = &exthdr->nexthdr;
|
|
exthdr = (struct ipv6_opt_hdr *)(nh + offset);
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int mip6_destopt_init_state(struct xfrm_state *x)
|
|
{
|
|
if (x->id.spi) {
|
|
pr_info("%s: spi is not 0: %u\n", __func__, x->id.spi);
|
|
return -EINVAL;
|
|
}
|
|
if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
|
|
pr_info("%s: state's mode is not %u: %u\n",
|
|
__func__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
|
|
return -EINVAL;
|
|
}
|
|
|
|
x->props.header_len = sizeof(struct ipv6_destopt_hdr) +
|
|
calc_padlen(sizeof(struct ipv6_destopt_hdr), 6) +
|
|
sizeof(struct ipv6_destopt_hao);
|
|
WARN_ON(x->props.header_len != 24);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Do nothing about destroying since it has no specific operation for
|
|
* destination options header unlike IPsec protocols.
|
|
*/
|
|
static void mip6_destopt_destroy(struct xfrm_state *x)
|
|
{
|
|
}
|
|
|
|
static const struct xfrm_type mip6_destopt_type = {
|
|
.description = "MIP6DESTOPT",
|
|
.owner = THIS_MODULE,
|
|
.proto = IPPROTO_DSTOPTS,
|
|
.flags = XFRM_TYPE_NON_FRAGMENT | XFRM_TYPE_LOCAL_COADDR,
|
|
.init_state = mip6_destopt_init_state,
|
|
.destructor = mip6_destopt_destroy,
|
|
.input = mip6_destopt_input,
|
|
.output = mip6_destopt_output,
|
|
.reject = mip6_destopt_reject,
|
|
.hdr_offset = mip6_destopt_offset,
|
|
};
|
|
|
|
static int mip6_rthdr_input(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
const struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
struct rt2_hdr *rt2 = (struct rt2_hdr *)skb->data;
|
|
int err = rt2->rt_hdr.nexthdr;
|
|
|
|
spin_lock(&x->lock);
|
|
if (!ipv6_addr_equal(&iph->daddr, (struct in6_addr *)x->coaddr) &&
|
|
!ipv6_addr_any((struct in6_addr *)x->coaddr))
|
|
err = -ENOENT;
|
|
spin_unlock(&x->lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Routing Header type 2 is inserted.
|
|
* IP Header's dst address is replaced with Routing Header's Home Address.
|
|
*/
|
|
static int mip6_rthdr_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *iph;
|
|
struct rt2_hdr *rt2;
|
|
u8 nexthdr;
|
|
|
|
skb_push(skb, -skb_network_offset(skb));
|
|
iph = ipv6_hdr(skb);
|
|
|
|
nexthdr = *skb_mac_header(skb);
|
|
*skb_mac_header(skb) = IPPROTO_ROUTING;
|
|
|
|
rt2 = (struct rt2_hdr *)skb_transport_header(skb);
|
|
rt2->rt_hdr.nexthdr = nexthdr;
|
|
rt2->rt_hdr.hdrlen = (x->props.header_len >> 3) - 1;
|
|
rt2->rt_hdr.type = IPV6_SRCRT_TYPE_2;
|
|
rt2->rt_hdr.segments_left = 1;
|
|
memset(&rt2->reserved, 0, sizeof(rt2->reserved));
|
|
|
|
WARN_ON(rt2->rt_hdr.hdrlen != 2);
|
|
|
|
memcpy(&rt2->addr, &iph->daddr, sizeof(rt2->addr));
|
|
spin_lock_bh(&x->lock);
|
|
memcpy(&iph->daddr, x->coaddr, sizeof(iph->daddr));
|
|
spin_unlock_bh(&x->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mip6_rthdr_offset(struct xfrm_state *x, struct sk_buff *skb,
|
|
u8 **nexthdr)
|
|
{
|
|
u16 offset = sizeof(struct ipv6hdr);
|
|
struct ipv6_opt_hdr *exthdr =
|
|
(struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
|
|
const unsigned char *nh = skb_network_header(skb);
|
|
unsigned int packet_len = skb_tail_pointer(skb) -
|
|
skb_network_header(skb);
|
|
int found_rhdr = 0;
|
|
|
|
*nexthdr = &ipv6_hdr(skb)->nexthdr;
|
|
|
|
while (offset + 1 <= packet_len) {
|
|
|
|
switch (**nexthdr) {
|
|
case NEXTHDR_HOP:
|
|
break;
|
|
case NEXTHDR_ROUTING:
|
|
if (offset + 3 <= packet_len) {
|
|
struct ipv6_rt_hdr *rt;
|
|
rt = (struct ipv6_rt_hdr *)(nh + offset);
|
|
if (rt->type != 0)
|
|
return offset;
|
|
}
|
|
found_rhdr = 1;
|
|
break;
|
|
case NEXTHDR_DEST:
|
|
if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
|
|
return offset;
|
|
|
|
if (found_rhdr)
|
|
return offset;
|
|
|
|
break;
|
|
default:
|
|
return offset;
|
|
}
|
|
|
|
offset += ipv6_optlen(exthdr);
|
|
*nexthdr = &exthdr->nexthdr;
|
|
exthdr = (struct ipv6_opt_hdr *)(nh + offset);
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int mip6_rthdr_init_state(struct xfrm_state *x)
|
|
{
|
|
if (x->id.spi) {
|
|
pr_info("%s: spi is not 0: %u\n", __func__, x->id.spi);
|
|
return -EINVAL;
|
|
}
|
|
if (x->props.mode != XFRM_MODE_ROUTEOPTIMIZATION) {
|
|
pr_info("%s: state's mode is not %u: %u\n",
|
|
__func__, XFRM_MODE_ROUTEOPTIMIZATION, x->props.mode);
|
|
return -EINVAL;
|
|
}
|
|
|
|
x->props.header_len = sizeof(struct rt2_hdr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Do nothing about destroying since it has no specific operation for routing
|
|
* header type 2 unlike IPsec protocols.
|
|
*/
|
|
static void mip6_rthdr_destroy(struct xfrm_state *x)
|
|
{
|
|
}
|
|
|
|
static const struct xfrm_type mip6_rthdr_type = {
|
|
.description = "MIP6RT",
|
|
.owner = THIS_MODULE,
|
|
.proto = IPPROTO_ROUTING,
|
|
.flags = XFRM_TYPE_NON_FRAGMENT | XFRM_TYPE_REMOTE_COADDR,
|
|
.init_state = mip6_rthdr_init_state,
|
|
.destructor = mip6_rthdr_destroy,
|
|
.input = mip6_rthdr_input,
|
|
.output = mip6_rthdr_output,
|
|
.hdr_offset = mip6_rthdr_offset,
|
|
};
|
|
|
|
static int __init mip6_init(void)
|
|
{
|
|
pr_info("Mobile IPv6\n");
|
|
|
|
if (xfrm_register_type(&mip6_destopt_type, AF_INET6) < 0) {
|
|
pr_info("%s: can't add xfrm type(destopt)\n", __func__);
|
|
goto mip6_destopt_xfrm_fail;
|
|
}
|
|
if (xfrm_register_type(&mip6_rthdr_type, AF_INET6) < 0) {
|
|
pr_info("%s: can't add xfrm type(rthdr)\n", __func__);
|
|
goto mip6_rthdr_xfrm_fail;
|
|
}
|
|
if (rawv6_mh_filter_register(mip6_mh_filter) < 0) {
|
|
pr_info("%s: can't add rawv6 mh filter\n", __func__);
|
|
goto mip6_rawv6_mh_fail;
|
|
}
|
|
|
|
|
|
return 0;
|
|
|
|
mip6_rawv6_mh_fail:
|
|
xfrm_unregister_type(&mip6_rthdr_type, AF_INET6);
|
|
mip6_rthdr_xfrm_fail:
|
|
xfrm_unregister_type(&mip6_destopt_type, AF_INET6);
|
|
mip6_destopt_xfrm_fail:
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static void __exit mip6_fini(void)
|
|
{
|
|
if (rawv6_mh_filter_unregister(mip6_mh_filter) < 0)
|
|
pr_info("%s: can't remove rawv6 mh filter\n", __func__);
|
|
if (xfrm_unregister_type(&mip6_rthdr_type, AF_INET6) < 0)
|
|
pr_info("%s: can't remove xfrm type(rthdr)\n", __func__);
|
|
if (xfrm_unregister_type(&mip6_destopt_type, AF_INET6) < 0)
|
|
pr_info("%s: can't remove xfrm type(destopt)\n", __func__);
|
|
}
|
|
|
|
module_init(mip6_init);
|
|
module_exit(mip6_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_DSTOPTS);
|
|
MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ROUTING);
|