2019-05-19 06:08:20 -06:00
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// SPDX-License-Identifier: GPL-2.0-only
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2012-03-12 01:03:32 -06:00
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#define pr_fmt(fmt) "IPsec: " fmt
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2017-05-03 08:57:57 -06:00
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#include <crypto/algapi.h>
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2009-10-07 16:48:17 -06:00
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#include <crypto/hash.h>
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2006-08-19 22:24:50 -06:00
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#include <linux/err.h>
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2005-04-16 16:20:36 -06:00
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#include <linux/module.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 02:04:11 -06:00
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#include <linux/slab.h>
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2005-04-16 16:20:36 -06:00
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#include <net/ip.h>
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#include <net/xfrm.h>
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#include <net/ah.h>
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#include <linux/crypto.h>
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#include <linux/pfkeyv2.h>
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2009-10-07 16:48:17 -06:00
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#include <linux/scatterlist.h>
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2005-04-16 16:20:36 -06:00
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#include <net/icmp.h>
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2005-12-26 21:43:12 -07:00
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#include <net/protocol.h>
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2005-04-16 16:20:36 -06:00
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2009-10-07 16:48:17 -06:00
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struct ah_skb_cb {
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struct xfrm_skb_cb xfrm;
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void *tmp;
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};
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#define AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0]))
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static void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags,
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unsigned int size)
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{
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unsigned int len;
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len = size + crypto_ahash_digestsize(ahash) +
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(crypto_ahash_alignmask(ahash) &
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~(crypto_tfm_ctx_alignment() - 1));
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len = ALIGN(len, crypto_tfm_ctx_alignment());
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len += sizeof(struct ahash_request) + crypto_ahash_reqsize(ahash);
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len = ALIGN(len, __alignof__(struct scatterlist));
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len += sizeof(struct scatterlist) * nfrags;
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return kmalloc(len, GFP_ATOMIC);
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}
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static inline u8 *ah_tmp_auth(void *tmp, unsigned int offset)
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{
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return tmp + offset;
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}
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static inline u8 *ah_tmp_icv(struct crypto_ahash *ahash, void *tmp,
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unsigned int offset)
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{
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return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1);
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}
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static inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash,
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u8 *icv)
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{
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struct ahash_request *req;
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req = (void *)PTR_ALIGN(icv + crypto_ahash_digestsize(ahash),
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crypto_tfm_ctx_alignment());
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ahash_request_set_tfm(req, ahash);
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return req;
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}
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static inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash,
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struct ahash_request *req)
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{
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return (void *)ALIGN((unsigned long)(req + 1) +
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crypto_ahash_reqsize(ahash),
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__alignof__(struct scatterlist));
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}
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2005-04-16 16:20:36 -06:00
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/* Clear mutable options and find final destination to substitute
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* into IP header for icv calculation. Options are already checked
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* for validity, so paranoia is not required. */
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2011-04-21 22:53:02 -06:00
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static int ip_clear_mutable_options(const struct iphdr *iph, __be32 *daddr)
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2005-04-16 16:20:36 -06:00
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{
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2012-04-14 19:34:41 -06:00
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unsigned char *optptr = (unsigned char *)(iph+1);
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2005-04-16 16:20:36 -06:00
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int l = iph->ihl*4 - sizeof(struct iphdr);
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int optlen;
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while (l > 0) {
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switch (*optptr) {
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case IPOPT_END:
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return 0;
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case IPOPT_NOOP:
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l--;
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optptr++;
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continue;
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}
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optlen = optptr[1];
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if (optlen<2 || optlen>l)
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return -EINVAL;
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switch (*optptr) {
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case IPOPT_SEC:
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case 0x85: /* Some "Extended Security" crap. */
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2006-08-03 17:46:20 -06:00
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case IPOPT_CIPSO:
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2005-04-16 16:20:36 -06:00
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case IPOPT_RA:
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case 0x80|21: /* RFC1770 */
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break;
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case IPOPT_LSRR:
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case IPOPT_SSRR:
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if (optlen < 6)
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return -EINVAL;
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memcpy(daddr, optptr+optlen-4, 4);
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/* Fall through */
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default:
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[IPSEC] AH4: Update IPv4 options handling to conform to RFC 4302.
In testing our ESP/AH offload hardware, I discovered an issue with how
AH handles mutable fields in IPv4. RFC 4302 (AH) states the following
on the subject:
For IPv4, the entire option is viewed as a unit; so even
though the type and length fields within most options are immutable
in transit, if an option is classified as mutable, the entire option
is zeroed for ICV computation purposes.
The current implementation does not zero the type and length fields,
resulting in authentication failures when communicating with hosts
that do (i.e. FreeBSD).
I have tested record route and timestamp options (ping -R and ping -T)
on a small network involving Windows XP, FreeBSD 6.2, and Linux hosts,
with one router. In the presence of these options, the FreeBSD and
Linux hosts (with the patch or with the hardware) can communicate.
The Windows XP host simply fails to accept these packets with or
without the patch.
I have also been trying to test source routing options (using
traceroute -g), but haven't had much luck getting this option to work
*without* AH, let alone with.
Signed-off-by: Nick Bowler <nbowler@ellipticsemi.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-08-22 13:33:51 -06:00
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memset(optptr, 0, optlen);
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2005-04-16 16:20:36 -06:00
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}
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l -= optlen;
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optptr += optlen;
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}
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return 0;
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}
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2009-10-07 16:48:17 -06:00
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static void ah_output_done(struct crypto_async_request *base, int err)
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{
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u8 *icv;
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struct iphdr *iph;
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struct sk_buff *skb = base->data;
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struct xfrm_state *x = skb_dst(skb)->xfrm;
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struct ah_data *ahp = x->data;
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struct iphdr *top_iph = ip_hdr(skb);
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struct ip_auth_hdr *ah = ip_auth_hdr(skb);
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int ihl = ip_hdrlen(skb);
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iph = AH_SKB_CB(skb)->tmp;
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icv = ah_tmp_icv(ahp->ahash, iph, ihl);
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memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
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top_iph->tos = iph->tos;
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top_iph->ttl = iph->ttl;
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top_iph->frag_off = iph->frag_off;
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if (top_iph->ihl != 5) {
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top_iph->daddr = iph->daddr;
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memcpy(top_iph+1, iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
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}
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kfree(AH_SKB_CB(skb)->tmp);
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xfrm_output_resume(skb, err);
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}
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2005-04-16 16:20:36 -06:00
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static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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int err;
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2009-10-07 16:48:17 -06:00
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int nfrags;
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int ihl;
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u8 *icv;
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struct sk_buff *trailer;
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struct crypto_ahash *ahash;
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struct ahash_request *req;
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struct scatterlist *sg;
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2005-04-16 16:20:36 -06:00
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struct iphdr *iph, *top_iph;
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struct ip_auth_hdr *ah;
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struct ah_data *ahp;
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2014-01-17 18:54:24 -07:00
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int seqhi_len = 0;
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__be32 *seqhi;
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int sglists = 0;
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struct scatterlist *seqhisg;
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2009-10-07 16:48:17 -06:00
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ahp = x->data;
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ahash = ahp->ahash;
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if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
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goto out;
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nfrags = err;
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2005-04-16 16:20:36 -06:00
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2007-10-10 16:44:06 -06:00
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skb_push(skb, -skb_network_offset(skb));
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2009-10-07 16:48:17 -06:00
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ah = ip_auth_hdr(skb);
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ihl = ip_hdrlen(skb);
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2014-01-17 18:54:24 -07:00
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if (x->props.flags & XFRM_STATE_ESN) {
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sglists = 1;
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seqhi_len = sizeof(*seqhi);
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}
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2009-10-07 16:48:17 -06:00
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err = -ENOMEM;
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2014-01-17 18:54:24 -07:00
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iph = ah_alloc_tmp(ahash, nfrags + sglists, ihl + seqhi_len);
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2009-10-07 16:48:17 -06:00
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if (!iph)
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goto out;
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2014-01-17 18:54:24 -07:00
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seqhi = (__be32 *)((char *)iph + ihl);
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icv = ah_tmp_icv(ahash, seqhi, seqhi_len);
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2009-10-07 16:48:17 -06:00
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req = ah_tmp_req(ahash, icv);
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sg = ah_req_sg(ahash, req);
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2014-01-17 18:54:24 -07:00
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seqhisg = sg + nfrags;
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2009-10-07 16:48:17 -06:00
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memset(ah->auth_data, 0, ahp->icv_trunc_len);
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2007-04-20 23:47:35 -06:00
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top_iph = ip_hdr(skb);
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2005-04-16 16:20:36 -06:00
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iph->tos = top_iph->tos;
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iph->ttl = top_iph->ttl;
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iph->frag_off = top_iph->frag_off;
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if (top_iph->ihl != 5) {
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iph->daddr = top_iph->daddr;
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memcpy(iph+1, top_iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
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err = ip_clear_mutable_options(top_iph, &top_iph->daddr);
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if (err)
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2009-10-07 16:48:17 -06:00
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goto out_free;
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2005-04-16 16:20:36 -06:00
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}
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2007-10-10 16:44:44 -06:00
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ah->nexthdr = *skb_mac_header(skb);
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*skb_mac_header(skb) = IPPROTO_AH;
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2005-04-16 16:20:36 -06:00
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top_iph->tos = 0;
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top_iph->tot_len = htons(skb->len);
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top_iph->frag_off = 0;
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top_iph->ttl = 0;
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top_iph->check = 0;
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2011-02-01 23:29:02 -07:00
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if (x->props.flags & XFRM_STATE_ALIGN4)
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ah->hdrlen = (XFRM_ALIGN4(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
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else
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ah->hdrlen = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
|
2005-04-16 16:20:36 -06:00
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ah->reserved = 0;
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ah->spi = x->id.spi;
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2011-03-07 17:06:31 -07:00
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ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
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2007-10-09 14:33:35 -06:00
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2014-01-17 18:54:24 -07:00
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sg_init_table(sg, nfrags + sglists);
|
2017-06-03 20:16:23 -06:00
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err = skb_to_sgvec_nomark(skb, sg, 0, skb->len);
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if (unlikely(err < 0))
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goto out_free;
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2007-10-09 14:33:35 -06:00
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2014-01-17 18:54:24 -07:00
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if (x->props.flags & XFRM_STATE_ESN) {
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/* Attach seqhi sg right after packet payload */
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*seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
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sg_set_buf(seqhisg, seqhi, seqhi_len);
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}
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ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
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2009-10-07 16:48:17 -06:00
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ahash_request_set_callback(req, 0, ah_output_done, skb);
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AH_SKB_CB(skb)->tmp = iph;
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err = crypto_ahash_digest(req);
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if (err) {
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if (err == -EINPROGRESS)
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goto out;
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2017-10-18 01:00:35 -06:00
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if (err == -ENOSPC)
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2009-10-07 16:48:17 -06:00
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err = NET_XMIT_DROP;
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goto out_free;
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}
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memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
|
2005-04-16 16:20:36 -06:00
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top_iph->tos = iph->tos;
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top_iph->ttl = iph->ttl;
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top_iph->frag_off = iph->frag_off;
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if (top_iph->ihl != 5) {
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top_iph->daddr = iph->daddr;
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memcpy(top_iph+1, iph+1, top_iph->ihl*4 - sizeof(struct iphdr));
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}
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2009-10-07 16:48:17 -06:00
|
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out_free:
|
|
|
|
kfree(iph);
|
|
|
|
out:
|
2005-04-16 16:20:36 -06:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2009-10-07 16:48:17 -06:00
|
|
|
static void ah_input_done(struct crypto_async_request *base, int err)
|
|
|
|
{
|
|
|
|
u8 *auth_data;
|
|
|
|
u8 *icv;
|
|
|
|
struct iphdr *work_iph;
|
|
|
|
struct sk_buff *skb = base->data;
|
|
|
|
struct xfrm_state *x = xfrm_input_state(skb);
|
|
|
|
struct ah_data *ahp = x->data;
|
|
|
|
struct ip_auth_hdr *ah = ip_auth_hdr(skb);
|
|
|
|
int ihl = ip_hdrlen(skb);
|
|
|
|
int ah_hlen = (ah->hdrlen + 2) << 2;
|
|
|
|
|
2017-01-16 04:17:55 -07:00
|
|
|
if (err)
|
|
|
|
goto out;
|
|
|
|
|
2009-10-07 16:48:17 -06:00
|
|
|
work_iph = AH_SKB_CB(skb)->tmp;
|
|
|
|
auth_data = ah_tmp_auth(work_iph, ihl);
|
|
|
|
icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);
|
|
|
|
|
2017-05-03 08:57:57 -06:00
|
|
|
err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0;
|
2009-10-07 16:48:17 -06:00
|
|
|
if (err)
|
|
|
|
goto out;
|
|
|
|
|
2011-11-08 05:12:45 -07:00
|
|
|
err = ah->nexthdr;
|
|
|
|
|
2009-10-07 16:48:17 -06:00
|
|
|
skb->network_header += ah_hlen;
|
|
|
|
memcpy(skb_network_header(skb), work_iph, ihl);
|
|
|
|
__skb_pull(skb, ah_hlen + ihl);
|
2012-12-28 01:07:16 -07:00
|
|
|
|
|
|
|
if (x->props.mode == XFRM_MODE_TUNNEL)
|
|
|
|
skb_reset_transport_header(skb);
|
|
|
|
else
|
|
|
|
skb_set_transport_header(skb, -ihl);
|
2009-10-07 16:48:17 -06:00
|
|
|
out:
|
|
|
|
kfree(AH_SKB_CB(skb)->tmp);
|
|
|
|
xfrm_input_resume(skb, err);
|
|
|
|
}
|
|
|
|
|
2006-04-01 01:52:46 -07:00
|
|
|
static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
int ah_hlen;
|
2006-05-28 00:06:13 -06:00
|
|
|
int ihl;
|
2007-10-10 16:46:21 -06:00
|
|
|
int nexthdr;
|
2009-10-07 16:48:17 -06:00
|
|
|
int nfrags;
|
|
|
|
u8 *auth_data;
|
|
|
|
u8 *icv;
|
|
|
|
struct sk_buff *trailer;
|
|
|
|
struct crypto_ahash *ahash;
|
|
|
|
struct ahash_request *req;
|
|
|
|
struct scatterlist *sg;
|
|
|
|
struct iphdr *iph, *work_iph;
|
2005-04-16 16:20:36 -06:00
|
|
|
struct ip_auth_hdr *ah;
|
|
|
|
struct ah_data *ahp;
|
2009-10-07 16:48:17 -06:00
|
|
|
int err = -ENOMEM;
|
2014-01-17 18:54:25 -07:00
|
|
|
int seqhi_len = 0;
|
|
|
|
__be32 *seqhi;
|
|
|
|
int sglists = 0;
|
|
|
|
struct scatterlist *seqhisg;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2007-10-10 16:45:25 -06:00
|
|
|
if (!pskb_may_pull(skb, sizeof(*ah)))
|
2005-04-16 16:20:36 -06:00
|
|
|
goto out;
|
|
|
|
|
2007-10-10 16:45:25 -06:00
|
|
|
ah = (struct ip_auth_hdr *)skb->data;
|
2005-04-16 16:20:36 -06:00
|
|
|
ahp = x->data;
|
2009-10-07 16:48:17 -06:00
|
|
|
ahash = ahp->ahash;
|
|
|
|
|
2007-10-10 16:46:21 -06:00
|
|
|
nexthdr = ah->nexthdr;
|
2005-04-16 16:20:36 -06:00
|
|
|
ah_hlen = (ah->hdrlen + 2) << 2;
|
2007-02-09 07:24:47 -07:00
|
|
|
|
2011-02-01 23:29:02 -07:00
|
|
|
if (x->props.flags & XFRM_STATE_ALIGN4) {
|
|
|
|
if (ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp->icv_full_len) &&
|
|
|
|
ah_hlen != XFRM_ALIGN4(sizeof(*ah) + ahp->icv_trunc_len))
|
|
|
|
goto out;
|
|
|
|
} else {
|
|
|
|
if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) &&
|
|
|
|
ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len))
|
|
|
|
goto out;
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
if (!pskb_may_pull(skb, ah_hlen))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
/* We are going to _remove_ AH header to keep sockets happy,
|
|
|
|
* so... Later this can change. */
|
2013-02-14 02:44:49 -07:00
|
|
|
if (skb_unclone(skb, GFP_ATOMIC))
|
2005-04-16 16:20:36 -06:00
|
|
|
goto out;
|
|
|
|
|
|
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
|
2009-10-07 16:48:17 -06:00
|
|
|
|
|
|
|
if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
|
|
|
|
goto out;
|
|
|
|
nfrags = err;
|
|
|
|
|
2011-01-11 00:13:33 -07:00
|
|
|
ah = (struct ip_auth_hdr *)skb->data;
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
ihl = ip_hdrlen(skb);
|
|
|
|
|
2014-01-17 18:54:25 -07:00
|
|
|
if (x->props.flags & XFRM_STATE_ESN) {
|
|
|
|
sglists = 1;
|
|
|
|
seqhi_len = sizeof(*seqhi);
|
|
|
|
}
|
|
|
|
|
|
|
|
work_iph = ah_alloc_tmp(ahash, nfrags + sglists, ihl +
|
|
|
|
ahp->icv_trunc_len + seqhi_len);
|
2015-08-25 14:38:50 -06:00
|
|
|
if (!work_iph) {
|
|
|
|
err = -ENOMEM;
|
2009-10-07 16:48:17 -06:00
|
|
|
goto out;
|
2015-08-25 14:38:50 -06:00
|
|
|
}
|
2009-10-07 16:48:17 -06:00
|
|
|
|
2014-01-17 18:54:25 -07:00
|
|
|
seqhi = (__be32 *)((char *)work_iph + ihl);
|
|
|
|
auth_data = ah_tmp_auth(seqhi, seqhi_len);
|
2009-10-07 16:48:17 -06:00
|
|
|
icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_len);
|
|
|
|
req = ah_tmp_req(ahash, icv);
|
|
|
|
sg = ah_req_sg(ahash, req);
|
2014-01-17 18:54:25 -07:00
|
|
|
seqhisg = sg + nfrags;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2009-10-07 16:48:17 -06:00
|
|
|
memcpy(work_iph, iph, ihl);
|
|
|
|
memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
|
|
|
|
memset(ah->auth_data, 0, ahp->icv_trunc_len);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
iph->ttl = 0;
|
|
|
|
iph->tos = 0;
|
|
|
|
iph->frag_off = 0;
|
|
|
|
iph->check = 0;
|
2006-05-28 00:06:13 -06:00
|
|
|
if (ihl > sizeof(*iph)) {
|
2006-11-08 01:23:14 -07:00
|
|
|
__be32 dummy;
|
2009-10-07 16:48:17 -06:00
|
|
|
err = ip_clear_mutable_options(iph, &dummy);
|
|
|
|
if (err)
|
|
|
|
goto out_free;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2007-11-13 22:45:58 -07:00
|
|
|
|
2009-10-07 16:48:17 -06:00
|
|
|
skb_push(skb, ihl);
|
2007-02-09 07:24:47 -07:00
|
|
|
|
2014-01-17 18:54:25 -07:00
|
|
|
sg_init_table(sg, nfrags + sglists);
|
2017-06-03 20:16:23 -06:00
|
|
|
err = skb_to_sgvec_nomark(skb, sg, 0, skb->len);
|
|
|
|
if (unlikely(err < 0))
|
|
|
|
goto out_free;
|
2009-10-07 16:48:17 -06:00
|
|
|
|
2014-01-17 18:54:25 -07:00
|
|
|
if (x->props.flags & XFRM_STATE_ESN) {
|
|
|
|
/* Attach seqhi sg right after packet payload */
|
|
|
|
*seqhi = XFRM_SKB_CB(skb)->seq.input.hi;
|
|
|
|
sg_set_buf(seqhisg, seqhi, seqhi_len);
|
|
|
|
}
|
|
|
|
ahash_request_set_crypt(req, sg, icv, skb->len + seqhi_len);
|
2009-10-07 16:48:17 -06:00
|
|
|
ahash_request_set_callback(req, 0, ah_input_done, skb);
|
|
|
|
|
|
|
|
AH_SKB_CB(skb)->tmp = work_iph;
|
|
|
|
|
|
|
|
err = crypto_ahash_digest(req);
|
|
|
|
if (err) {
|
|
|
|
if (err == -EINPROGRESS)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
goto out_free;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2007-11-13 22:45:58 -07:00
|
|
|
|
2017-05-03 08:57:57 -06:00
|
|
|
err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0;
|
2007-11-13 22:45:58 -07:00
|
|
|
if (err)
|
2009-10-07 16:48:17 -06:00
|
|
|
goto out_free;
|
2007-11-13 22:45:58 -07:00
|
|
|
|
2007-04-10 22:21:55 -06:00
|
|
|
skb->network_header += ah_hlen;
|
2009-10-07 16:48:17 -06:00
|
|
|
memcpy(skb_network_header(skb), work_iph, ihl);
|
2006-05-28 00:06:13 -06:00
|
|
|
__skb_pull(skb, ah_hlen + ihl);
|
2012-12-28 01:07:16 -07:00
|
|
|
if (x->props.mode == XFRM_MODE_TUNNEL)
|
|
|
|
skb_reset_transport_header(skb);
|
|
|
|
else
|
|
|
|
skb_set_transport_header(skb, -ihl);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2009-10-07 16:48:17 -06:00
|
|
|
err = nexthdr;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2009-10-07 16:48:17 -06:00
|
|
|
out_free:
|
|
|
|
kfree (work_iph);
|
2005-04-16 16:20:36 -06:00
|
|
|
out:
|
2006-08-19 22:24:50 -06:00
|
|
|
return err;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2014-02-21 00:41:09 -07:00
|
|
|
static int ah4_err(struct sk_buff *skb, u32 info)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2008-11-25 18:59:27 -07:00
|
|
|
struct net *net = dev_net(skb->dev);
|
2011-04-21 22:53:02 -06:00
|
|
|
const struct iphdr *iph = (const struct iphdr *)skb->data;
|
2008-11-03 01:23:42 -07:00
|
|
|
struct ip_auth_hdr *ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
|
2005-04-16 16:20:36 -06:00
|
|
|
struct xfrm_state *x;
|
|
|
|
|
2012-07-11 22:27:49 -06:00
|
|
|
switch (icmp_hdr(skb)->type) {
|
|
|
|
case ICMP_DEST_UNREACH:
|
|
|
|
if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
|
2014-02-21 00:41:09 -07:00
|
|
|
return 0;
|
2012-07-11 22:27:49 -06:00
|
|
|
case ICMP_REDIRECT:
|
|
|
|
break;
|
|
|
|
default:
|
2014-02-21 00:41:09 -07:00
|
|
|
return 0;
|
2012-07-11 22:27:49 -06:00
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2011-04-21 22:53:02 -06:00
|
|
|
x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
|
|
|
|
ah->spi, IPPROTO_AH, AF_INET);
|
2005-04-16 16:20:36 -06:00
|
|
|
if (!x)
|
2014-02-21 00:41:09 -07:00
|
|
|
return 0;
|
2012-07-11 22:27:49 -06:00
|
|
|
|
2013-05-27 14:46:31 -06:00
|
|
|
if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
|
2018-09-25 21:56:26 -06:00
|
|
|
ipv4_update_pmtu(skb, net, info, 0, IPPROTO_AH);
|
2013-05-27 14:46:31 -06:00
|
|
|
else
|
2018-09-25 21:56:27 -06:00
|
|
|
ipv4_redirect(skb, net, 0, IPPROTO_AH);
|
2005-04-16 16:20:36 -06:00
|
|
|
xfrm_state_put(x);
|
2014-02-21 00:41:09 -07:00
|
|
|
|
|
|
|
return 0;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2005-06-20 14:18:08 -06:00
|
|
|
static int ah_init_state(struct xfrm_state *x)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
struct ah_data *ahp = NULL;
|
|
|
|
struct xfrm_algo_desc *aalg_desc;
|
2009-10-07 16:48:17 -06:00
|
|
|
struct crypto_ahash *ahash;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
if (!x->aalg)
|
|
|
|
goto error;
|
|
|
|
|
|
|
|
if (x->encap)
|
|
|
|
goto error;
|
|
|
|
|
2006-07-21 15:51:30 -06:00
|
|
|
ahp = kzalloc(sizeof(*ahp), GFP_KERNEL);
|
2009-10-07 16:48:17 -06:00
|
|
|
if (!ahp)
|
2005-04-16 16:20:36 -06:00
|
|
|
return -ENOMEM;
|
|
|
|
|
2009-10-07 16:48:17 -06:00
|
|
|
ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0);
|
|
|
|
if (IS_ERR(ahash))
|
2006-08-19 22:24:50 -06:00
|
|
|
goto error;
|
|
|
|
|
2009-10-07 16:48:17 -06:00
|
|
|
ahp->ahash = ahash;
|
|
|
|
if (crypto_ahash_setkey(ahash, x->aalg->alg_key,
|
|
|
|
(x->aalg->alg_key_len + 7) / 8))
|
2005-04-16 16:20:36 -06:00
|
|
|
goto error;
|
2007-02-09 07:24:47 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/*
|
|
|
|
* 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
|
2009-10-07 16:48:17 -06:00
|
|
|
* after a successful crypto_alloc_ahash().
|
2005-04-16 16:20:36 -06:00
|
|
|
*/
|
|
|
|
aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
|
|
|
|
BUG_ON(!aalg_desc);
|
|
|
|
|
|
|
|
if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
|
2009-10-07 16:48:17 -06:00
|
|
|
crypto_ahash_digestsize(ahash)) {
|
2012-03-12 01:03:32 -06:00
|
|
|
pr_info("%s: %s digestsize %u != %hu\n",
|
|
|
|
__func__, x->aalg->alg_name,
|
|
|
|
crypto_ahash_digestsize(ahash),
|
|
|
|
aalg_desc->uinfo.auth.icv_fullbits / 8);
|
2005-04-16 16:20:36 -06:00
|
|
|
goto error;
|
|
|
|
}
|
2007-02-09 07:24:47 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;
|
2009-11-24 17:29:53 -07:00
|
|
|
ahp->icv_trunc_len = x->aalg->alg_trunc_len/8;
|
2007-02-09 07:24:47 -07:00
|
|
|
|
2011-02-01 23:29:02 -07:00
|
|
|
if (x->props.flags & XFRM_STATE_ALIGN4)
|
|
|
|
x->props.header_len = XFRM_ALIGN4(sizeof(struct ip_auth_hdr) +
|
|
|
|
ahp->icv_trunc_len);
|
|
|
|
else
|
|
|
|
x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) +
|
|
|
|
ahp->icv_trunc_len);
|
2006-09-22 16:05:15 -06:00
|
|
|
if (x->props.mode == XFRM_MODE_TUNNEL)
|
2005-04-16 16:20:36 -06:00
|
|
|
x->props.header_len += sizeof(struct iphdr);
|
|
|
|
x->data = ahp;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error:
|
|
|
|
if (ahp) {
|
2009-10-07 16:48:17 -06:00
|
|
|
crypto_free_ahash(ahp->ahash);
|
2005-04-16 16:20:36 -06:00
|
|
|
kfree(ahp);
|
|
|
|
}
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void ah_destroy(struct xfrm_state *x)
|
|
|
|
{
|
|
|
|
struct ah_data *ahp = x->data;
|
|
|
|
|
|
|
|
if (!ahp)
|
|
|
|
return;
|
|
|
|
|
2009-10-07 16:48:17 -06:00
|
|
|
crypto_free_ahash(ahp->ahash);
|
2005-04-16 16:20:36 -06:00
|
|
|
kfree(ahp);
|
|
|
|
}
|
|
|
|
|
2014-02-21 00:41:09 -07:00
|
|
|
static int ah4_rcv_cb(struct sk_buff *skb, int err)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-01-30 20:11:50 -07:00
|
|
|
static const struct xfrm_type ah_type =
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
.description = "AH4",
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.proto = IPPROTO_AH,
|
2007-10-08 18:25:53 -06:00
|
|
|
.flags = XFRM_TYPE_REPLAY_PROT,
|
2005-04-16 16:20:36 -06:00
|
|
|
.init_state = ah_init_state,
|
|
|
|
.destructor = ah_destroy,
|
|
|
|
.input = ah_input,
|
|
|
|
.output = ah_output
|
|
|
|
};
|
|
|
|
|
2014-02-21 00:41:09 -07:00
|
|
|
static struct xfrm4_protocol ah4_protocol = {
|
2005-04-16 16:20:36 -06:00
|
|
|
.handler = xfrm4_rcv,
|
2014-02-21 00:41:09 -07:00
|
|
|
.input_handler = xfrm_input,
|
|
|
|
.cb_handler = ah4_rcv_cb,
|
2005-04-16 16:20:36 -06:00
|
|
|
.err_handler = ah4_err,
|
2014-02-21 00:41:09 -07:00
|
|
|
.priority = 0,
|
2005-04-16 16:20:36 -06:00
|
|
|
};
|
|
|
|
|
|
|
|
static int __init ah4_init(void)
|
|
|
|
{
|
|
|
|
if (xfrm_register_type(&ah_type, AF_INET) < 0) {
|
2012-03-11 12:36:11 -06:00
|
|
|
pr_info("%s: can't add xfrm type\n", __func__);
|
2005-04-16 16:20:36 -06:00
|
|
|
return -EAGAIN;
|
|
|
|
}
|
2014-02-21 00:41:09 -07:00
|
|
|
if (xfrm4_protocol_register(&ah4_protocol, IPPROTO_AH) < 0) {
|
2012-03-11 12:36:11 -06:00
|
|
|
pr_info("%s: can't add protocol\n", __func__);
|
2005-04-16 16:20:36 -06:00
|
|
|
xfrm_unregister_type(&ah_type, AF_INET);
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit ah4_fini(void)
|
|
|
|
{
|
2014-02-21 00:41:09 -07:00
|
|
|
if (xfrm4_protocol_deregister(&ah4_protocol, IPPROTO_AH) < 0)
|
2012-03-11 12:36:11 -06:00
|
|
|
pr_info("%s: can't remove protocol\n", __func__);
|
2005-04-16 16:20:36 -06:00
|
|
|
if (xfrm_unregister_type(&ah_type, AF_INET) < 0)
|
2012-03-11 12:36:11 -06:00
|
|
|
pr_info("%s: can't remove xfrm type\n", __func__);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
module_init(ah4_init);
|
|
|
|
module_exit(ah4_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
2007-06-27 00:57:49 -06:00
|
|
|
MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_AH);
|