mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 00:16:39 +07:00
1ab1457c42
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
553 lines
13 KiB
C
553 lines
13 KiB
C
/*
|
|
* Copyright (C)2002 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, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
* Authors
|
|
*
|
|
* Mitsuru KANDA @USAGI : IPv6 Support
|
|
* Kazunori MIYAZAWA @USAGI :
|
|
* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
|
|
*
|
|
* This file is derived from net/ipv4/ah.c.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <net/ip.h>
|
|
#include <net/ah.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/pfkeyv2.h>
|
|
#include <linux/string.h>
|
|
#include <net/icmp.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/protocol.h>
|
|
#include <net/xfrm.h>
|
|
#include <asm/scatterlist.h>
|
|
|
|
static int zero_out_mutable_opts(struct ipv6_opt_hdr *opthdr)
|
|
{
|
|
u8 *opt = (u8 *)opthdr;
|
|
int len = ipv6_optlen(opthdr);
|
|
int off = 0;
|
|
int optlen = 0;
|
|
|
|
off += 2;
|
|
len -= 2;
|
|
|
|
while (len > 0) {
|
|
|
|
switch (opt[off]) {
|
|
|
|
case IPV6_TLV_PAD0:
|
|
optlen = 1;
|
|
break;
|
|
default:
|
|
if (len < 2)
|
|
goto bad;
|
|
optlen = opt[off+1]+2;
|
|
if (len < optlen)
|
|
goto bad;
|
|
if (opt[off] & 0x20)
|
|
memset(&opt[off+2], 0, opt[off+1]);
|
|
break;
|
|
}
|
|
|
|
off += optlen;
|
|
len -= optlen;
|
|
}
|
|
if (len == 0)
|
|
return 1;
|
|
|
|
bad:
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_MIP6
|
|
/**
|
|
* ipv6_rearrange_destopt - rearrange IPv6 destination options header
|
|
* @iph: IPv6 header
|
|
* @destopt: destionation options header
|
|
*/
|
|
static void ipv6_rearrange_destopt(struct ipv6hdr *iph, struct ipv6_opt_hdr *destopt)
|
|
{
|
|
u8 *opt = (u8 *)destopt;
|
|
int len = ipv6_optlen(destopt);
|
|
int off = 0;
|
|
int optlen = 0;
|
|
|
|
off += 2;
|
|
len -= 2;
|
|
|
|
while (len > 0) {
|
|
|
|
switch (opt[off]) {
|
|
|
|
case IPV6_TLV_PAD0:
|
|
optlen = 1;
|
|
break;
|
|
default:
|
|
if (len < 2)
|
|
goto bad;
|
|
optlen = opt[off+1]+2;
|
|
if (len < optlen)
|
|
goto bad;
|
|
|
|
/* Rearrange the source address in @iph and the
|
|
* addresses in home address option for final source.
|
|
* See 11.3.2 of RFC 3775 for details.
|
|
*/
|
|
if (opt[off] == IPV6_TLV_HAO) {
|
|
struct in6_addr final_addr;
|
|
struct ipv6_destopt_hao *hao;
|
|
|
|
hao = (struct ipv6_destopt_hao *)&opt[off];
|
|
if (hao->length != sizeof(hao->addr)) {
|
|
if (net_ratelimit())
|
|
printk(KERN_WARNING "destopt hao: invalid header length: %u\n", hao->length);
|
|
goto bad;
|
|
}
|
|
ipv6_addr_copy(&final_addr, &hao->addr);
|
|
ipv6_addr_copy(&hao->addr, &iph->saddr);
|
|
ipv6_addr_copy(&iph->saddr, &final_addr);
|
|
}
|
|
break;
|
|
}
|
|
|
|
off += optlen;
|
|
len -= optlen;
|
|
}
|
|
/* Note: ok if len == 0 */
|
|
bad:
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* ipv6_rearrange_rthdr - rearrange IPv6 routing header
|
|
* @iph: IPv6 header
|
|
* @rthdr: routing header
|
|
*
|
|
* Rearrange the destination address in @iph and the addresses in @rthdr
|
|
* so that they appear in the order they will at the final destination.
|
|
* See Appendix A2 of RFC 2402 for details.
|
|
*/
|
|
static void ipv6_rearrange_rthdr(struct ipv6hdr *iph, struct ipv6_rt_hdr *rthdr)
|
|
{
|
|
int segments, segments_left;
|
|
struct in6_addr *addrs;
|
|
struct in6_addr final_addr;
|
|
|
|
segments_left = rthdr->segments_left;
|
|
if (segments_left == 0)
|
|
return;
|
|
rthdr->segments_left = 0;
|
|
|
|
/* The value of rthdr->hdrlen has been verified either by the system
|
|
* call if it is locally generated, or by ipv6_rthdr_rcv() for incoming
|
|
* packets. So we can assume that it is even and that segments is
|
|
* greater than or equal to segments_left.
|
|
*
|
|
* For the same reason we can assume that this option is of type 0.
|
|
*/
|
|
segments = rthdr->hdrlen >> 1;
|
|
|
|
addrs = ((struct rt0_hdr *)rthdr)->addr;
|
|
ipv6_addr_copy(&final_addr, addrs + segments - 1);
|
|
|
|
addrs += segments - segments_left;
|
|
memmove(addrs + 1, addrs, (segments_left - 1) * sizeof(*addrs));
|
|
|
|
ipv6_addr_copy(addrs, &iph->daddr);
|
|
ipv6_addr_copy(&iph->daddr, &final_addr);
|
|
}
|
|
|
|
static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir)
|
|
{
|
|
union {
|
|
struct ipv6hdr *iph;
|
|
struct ipv6_opt_hdr *opth;
|
|
struct ipv6_rt_hdr *rth;
|
|
char *raw;
|
|
} exthdr = { .iph = iph };
|
|
char *end = exthdr.raw + len;
|
|
int nexthdr = iph->nexthdr;
|
|
|
|
exthdr.iph++;
|
|
|
|
while (exthdr.raw < end) {
|
|
switch (nexthdr) {
|
|
case NEXTHDR_DEST:
|
|
#ifdef CONFIG_IPV6_MIP6
|
|
if (dir == XFRM_POLICY_OUT)
|
|
ipv6_rearrange_destopt(iph, exthdr.opth);
|
|
#endif
|
|
case NEXTHDR_HOP:
|
|
if (!zero_out_mutable_opts(exthdr.opth)) {
|
|
LIMIT_NETDEBUG(
|
|
KERN_WARNING "overrun %sopts\n",
|
|
nexthdr == NEXTHDR_HOP ?
|
|
"hop" : "dest");
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
|
|
case NEXTHDR_ROUTING:
|
|
ipv6_rearrange_rthdr(iph, exthdr.rth);
|
|
break;
|
|
|
|
default :
|
|
return 0;
|
|
}
|
|
|
|
nexthdr = exthdr.opth->nexthdr;
|
|
exthdr.raw += ipv6_optlen(exthdr.opth);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
int extlen;
|
|
struct ipv6hdr *top_iph;
|
|
struct ip_auth_hdr *ah;
|
|
struct ah_data *ahp;
|
|
u8 nexthdr;
|
|
char tmp_base[8];
|
|
struct {
|
|
#ifdef CONFIG_IPV6_MIP6
|
|
struct in6_addr saddr;
|
|
#endif
|
|
struct in6_addr daddr;
|
|
char hdrs[0];
|
|
} *tmp_ext;
|
|
|
|
top_iph = (struct ipv6hdr *)skb->data;
|
|
top_iph->payload_len = htons(skb->len - sizeof(*top_iph));
|
|
|
|
nexthdr = *skb->nh.raw;
|
|
*skb->nh.raw = IPPROTO_AH;
|
|
|
|
/* When there are no extension headers, we only need to save the first
|
|
* 8 bytes of the base IP header.
|
|
*/
|
|
memcpy(tmp_base, top_iph, sizeof(tmp_base));
|
|
|
|
tmp_ext = NULL;
|
|
extlen = skb->h.raw - (unsigned char *)(top_iph + 1);
|
|
if (extlen) {
|
|
extlen += sizeof(*tmp_ext);
|
|
tmp_ext = kmalloc(extlen, GFP_ATOMIC);
|
|
if (!tmp_ext) {
|
|
err = -ENOMEM;
|
|
goto error;
|
|
}
|
|
#ifdef CONFIG_IPV6_MIP6
|
|
memcpy(tmp_ext, &top_iph->saddr, extlen);
|
|
#else
|
|
memcpy(tmp_ext, &top_iph->daddr, extlen);
|
|
#endif
|
|
err = ipv6_clear_mutable_options(top_iph,
|
|
extlen - sizeof(*tmp_ext) +
|
|
sizeof(*top_iph),
|
|
XFRM_POLICY_OUT);
|
|
if (err)
|
|
goto error_free_iph;
|
|
}
|
|
|
|
ah = (struct ip_auth_hdr *)skb->h.raw;
|
|
ah->nexthdr = nexthdr;
|
|
|
|
top_iph->priority = 0;
|
|
top_iph->flow_lbl[0] = 0;
|
|
top_iph->flow_lbl[1] = 0;
|
|
top_iph->flow_lbl[2] = 0;
|
|
top_iph->hop_limit = 0;
|
|
|
|
ahp = x->data;
|
|
ah->hdrlen = (XFRM_ALIGN8(sizeof(struct ipv6_auth_hdr) +
|
|
ahp->icv_trunc_len) >> 2) - 2;
|
|
|
|
ah->reserved = 0;
|
|
ah->spi = x->id.spi;
|
|
ah->seq_no = htonl(++x->replay.oseq);
|
|
xfrm_aevent_doreplay(x);
|
|
err = ah_mac_digest(ahp, skb, ah->auth_data);
|
|
if (err)
|
|
goto error_free_iph;
|
|
memcpy(ah->auth_data, ahp->work_icv, ahp->icv_trunc_len);
|
|
|
|
err = 0;
|
|
|
|
memcpy(top_iph, tmp_base, sizeof(tmp_base));
|
|
if (tmp_ext) {
|
|
#ifdef CONFIG_IPV6_MIP6
|
|
memcpy(&top_iph->saddr, tmp_ext, extlen);
|
|
#else
|
|
memcpy(&top_iph->daddr, tmp_ext, extlen);
|
|
#endif
|
|
error_free_iph:
|
|
kfree(tmp_ext);
|
|
}
|
|
|
|
error:
|
|
return err;
|
|
}
|
|
|
|
static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
/*
|
|
* Before process AH
|
|
* [IPv6][Ext1][Ext2][AH][Dest][Payload]
|
|
* |<-------------->| hdr_len
|
|
*
|
|
* To erase AH:
|
|
* Keeping copy of cleared headers. After AH processing,
|
|
* Moving the pointer of skb->nh.raw by using skb_pull as long as AH
|
|
* header length. Then copy back the copy as long as hdr_len
|
|
* If destination header following AH exists, copy it into after [Ext2].
|
|
*
|
|
* |<>|[IPv6][Ext1][Ext2][Dest][Payload]
|
|
* There is offset of AH before IPv6 header after the process.
|
|
*/
|
|
|
|
struct ipv6_auth_hdr *ah;
|
|
struct ah_data *ahp;
|
|
unsigned char *tmp_hdr = NULL;
|
|
u16 hdr_len;
|
|
u16 ah_hlen;
|
|
int nexthdr;
|
|
int err = -EINVAL;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct ip_auth_hdr)))
|
|
goto out;
|
|
|
|
/* We are going to _remove_ AH header to keep sockets happy,
|
|
* so... Later this can change. */
|
|
if (skb_cloned(skb) &&
|
|
pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
|
|
goto out;
|
|
|
|
hdr_len = skb->data - skb->nh.raw;
|
|
ah = (struct ipv6_auth_hdr*)skb->data;
|
|
ahp = x->data;
|
|
nexthdr = ah->nexthdr;
|
|
ah_hlen = (ah->hdrlen + 2) << 2;
|
|
|
|
if (ah_hlen != XFRM_ALIGN8(sizeof(struct ipv6_auth_hdr) + ahp->icv_full_len) &&
|
|
ah_hlen != XFRM_ALIGN8(sizeof(struct ipv6_auth_hdr) + ahp->icv_trunc_len))
|
|
goto out;
|
|
|
|
if (!pskb_may_pull(skb, ah_hlen))
|
|
goto out;
|
|
|
|
tmp_hdr = kmemdup(skb->nh.raw, hdr_len, GFP_ATOMIC);
|
|
if (!tmp_hdr)
|
|
goto out;
|
|
if (ipv6_clear_mutable_options(skb->nh.ipv6h, hdr_len, XFRM_POLICY_IN))
|
|
goto free_out;
|
|
skb->nh.ipv6h->priority = 0;
|
|
skb->nh.ipv6h->flow_lbl[0] = 0;
|
|
skb->nh.ipv6h->flow_lbl[1] = 0;
|
|
skb->nh.ipv6h->flow_lbl[2] = 0;
|
|
skb->nh.ipv6h->hop_limit = 0;
|
|
|
|
{
|
|
u8 auth_data[MAX_AH_AUTH_LEN];
|
|
|
|
memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
|
|
memset(ah->auth_data, 0, ahp->icv_trunc_len);
|
|
skb_push(skb, hdr_len);
|
|
err = ah_mac_digest(ahp, skb, ah->auth_data);
|
|
if (err)
|
|
goto free_out;
|
|
err = -EINVAL;
|
|
if (memcmp(ahp->work_icv, auth_data, ahp->icv_trunc_len)) {
|
|
LIMIT_NETDEBUG(KERN_WARNING "ipsec ah authentication error\n");
|
|
x->stats.integrity_failed++;
|
|
goto free_out;
|
|
}
|
|
}
|
|
|
|
skb->h.raw = memcpy(skb->nh.raw += ah_hlen, tmp_hdr, hdr_len);
|
|
__skb_pull(skb, ah_hlen + hdr_len);
|
|
|
|
kfree(tmp_hdr);
|
|
|
|
return nexthdr;
|
|
|
|
free_out:
|
|
kfree(tmp_hdr);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
|
int type, int code, int offset, __be32 info)
|
|
{
|
|
struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;
|
|
struct ip_auth_hdr *ah = (struct ip_auth_hdr*)(skb->data+offset);
|
|
struct xfrm_state *x;
|
|
|
|
if (type != ICMPV6_DEST_UNREACH &&
|
|
type != ICMPV6_PKT_TOOBIG)
|
|
return;
|
|
|
|
x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, ah->spi, IPPROTO_AH, AF_INET6);
|
|
if (!x)
|
|
return;
|
|
|
|
NETDEBUG(KERN_DEBUG "pmtu discovery on SA AH/%08x/" NIP6_FMT "\n",
|
|
ntohl(ah->spi), NIP6(iph->daddr));
|
|
|
|
xfrm_state_put(x);
|
|
}
|
|
|
|
static int ah6_init_state(struct xfrm_state *x)
|
|
{
|
|
struct ah_data *ahp = NULL;
|
|
struct xfrm_algo_desc *aalg_desc;
|
|
struct crypto_hash *tfm;
|
|
|
|
if (!x->aalg)
|
|
goto error;
|
|
|
|
/* null auth can use a zero length key */
|
|
if (x->aalg->alg_key_len > 512)
|
|
goto error;
|
|
|
|
if (x->encap)
|
|
goto error;
|
|
|
|
ahp = kzalloc(sizeof(*ahp), GFP_KERNEL);
|
|
if (ahp == NULL)
|
|
return -ENOMEM;
|
|
|
|
ahp->key = x->aalg->alg_key;
|
|
ahp->key_len = (x->aalg->alg_key_len+7)/8;
|
|
tfm = crypto_alloc_hash(x->aalg->alg_name, 0, CRYPTO_ALG_ASYNC);
|
|
if (IS_ERR(tfm))
|
|
goto error;
|
|
|
|
ahp->tfm = tfm;
|
|
if (crypto_hash_setkey(tfm, ahp->key, ahp->key_len))
|
|
goto error;
|
|
|
|
/*
|
|
* Lookup the algorithm description maintained by xfrm_algo,
|
|
* verify crypto transform properties, and store information
|
|
* we need for AH processing. This lookup cannot fail here
|
|
* after a successful crypto_alloc_hash().
|
|
*/
|
|
aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
|
|
BUG_ON(!aalg_desc);
|
|
|
|
if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
|
|
crypto_hash_digestsize(tfm)) {
|
|
printk(KERN_INFO "AH: %s digestsize %u != %hu\n",
|
|
x->aalg->alg_name, crypto_hash_digestsize(tfm),
|
|
aalg_desc->uinfo.auth.icv_fullbits/8);
|
|
goto error;
|
|
}
|
|
|
|
ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;
|
|
ahp->icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8;
|
|
|
|
BUG_ON(ahp->icv_trunc_len > MAX_AH_AUTH_LEN);
|
|
|
|
ahp->work_icv = kmalloc(ahp->icv_full_len, GFP_KERNEL);
|
|
if (!ahp->work_icv)
|
|
goto error;
|
|
|
|
x->props.header_len = XFRM_ALIGN8(sizeof(struct ipv6_auth_hdr) + ahp->icv_trunc_len);
|
|
if (x->props.mode == XFRM_MODE_TUNNEL)
|
|
x->props.header_len += sizeof(struct ipv6hdr);
|
|
x->data = ahp;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
if (ahp) {
|
|
kfree(ahp->work_icv);
|
|
crypto_free_hash(ahp->tfm);
|
|
kfree(ahp);
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void ah6_destroy(struct xfrm_state *x)
|
|
{
|
|
struct ah_data *ahp = x->data;
|
|
|
|
if (!ahp)
|
|
return;
|
|
|
|
kfree(ahp->work_icv);
|
|
ahp->work_icv = NULL;
|
|
crypto_free_hash(ahp->tfm);
|
|
ahp->tfm = NULL;
|
|
kfree(ahp);
|
|
}
|
|
|
|
static struct xfrm_type ah6_type =
|
|
{
|
|
.description = "AH6",
|
|
.owner = THIS_MODULE,
|
|
.proto = IPPROTO_AH,
|
|
.init_state = ah6_init_state,
|
|
.destructor = ah6_destroy,
|
|
.input = ah6_input,
|
|
.output = ah6_output,
|
|
.hdr_offset = xfrm6_find_1stfragopt,
|
|
};
|
|
|
|
static struct inet6_protocol ah6_protocol = {
|
|
.handler = xfrm6_rcv,
|
|
.err_handler = ah6_err,
|
|
.flags = INET6_PROTO_NOPOLICY,
|
|
};
|
|
|
|
static int __init ah6_init(void)
|
|
{
|
|
if (xfrm_register_type(&ah6_type, AF_INET6) < 0) {
|
|
printk(KERN_INFO "ipv6 ah init: can't add xfrm type\n");
|
|
return -EAGAIN;
|
|
}
|
|
|
|
if (inet6_add_protocol(&ah6_protocol, IPPROTO_AH) < 0) {
|
|
printk(KERN_INFO "ipv6 ah init: can't add protocol\n");
|
|
xfrm_unregister_type(&ah6_type, AF_INET6);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit ah6_fini(void)
|
|
{
|
|
if (inet6_del_protocol(&ah6_protocol, IPPROTO_AH) < 0)
|
|
printk(KERN_INFO "ipv6 ah close: can't remove protocol\n");
|
|
|
|
if (xfrm_unregister_type(&ah6_type, AF_INET6) < 0)
|
|
printk(KERN_INFO "ipv6 ah close: can't remove xfrm type\n");
|
|
|
|
}
|
|
|
|
module_init(ah6_init);
|
|
module_exit(ah6_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|