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Diffstat (limited to 'net/ipv6/ah6.c')
-rw-r--r--net/ipv6/ah6.c101
1 files changed, 59 insertions, 42 deletions
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index b5995c1f4d7a..95372e0f1d21 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -13,8 +13,8 @@
#define pr_fmt(fmt) "IPv6: " fmt
-#include <crypto/algapi.h>
#include <crypto/hash.h>
+#include <crypto/utils.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <net/ip.h>
@@ -46,14 +46,40 @@ struct ah_skb_cb {
#define AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0]))
+/* Helper to save IPv6 addresses and extension headers to temporary storage */
+static inline void ah6_save_hdrs(struct tmp_ext *iph_ext,
+ struct ipv6hdr *top_iph, int extlen)
+{
+ if (!extlen)
+ return;
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ iph_ext->saddr = top_iph->saddr;
+#endif
+ iph_ext->daddr = top_iph->daddr;
+ memcpy(&iph_ext->hdrs, top_iph + 1, extlen - sizeof(*iph_ext));
+}
+
+/* Helper to restore IPv6 addresses and extension headers from temporary storage */
+static inline void ah6_restore_hdrs(struct ipv6hdr *top_iph,
+ struct tmp_ext *iph_ext, int extlen)
+{
+ if (!extlen)
+ return;
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+ top_iph->saddr = iph_ext->saddr;
+#endif
+ top_iph->daddr = iph_ext->daddr;
+ memcpy(top_iph + 1, &iph_ext->hdrs, extlen - sizeof(*iph_ext));
+}
+
static void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags,
unsigned int size)
{
unsigned int len;
- len = size + crypto_ahash_digestsize(ahash) +
- (crypto_ahash_alignmask(ahash) &
- ~(crypto_tfm_ctx_alignment() - 1));
+ len = size + crypto_ahash_digestsize(ahash);
len = ALIGN(len, crypto_tfm_ctx_alignment());
@@ -75,10 +101,9 @@ static inline u8 *ah_tmp_auth(u8 *tmp, unsigned int offset)
return tmp + offset;
}
-static inline u8 *ah_tmp_icv(struct crypto_ahash *ahash, void *tmp,
- unsigned int offset)
+static inline u8 *ah_tmp_icv(void *tmp, unsigned int offset)
{
- return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1);
+ return tmp + offset;
}
static inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash,
@@ -281,12 +306,12 @@ static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir)
return 0;
}
-static void ah6_output_done(struct crypto_async_request *base, int err)
+static void ah6_output_done(void *data, int err)
{
int extlen;
u8 *iph_base;
u8 *icv;
- struct sk_buff *skb = base->data;
+ struct sk_buff *skb = data;
struct xfrm_state *x = skb_dst(skb)->xfrm;
struct ah_data *ahp = x->data;
struct ipv6hdr *top_iph = ipv6_hdr(skb);
@@ -299,18 +324,12 @@ static void ah6_output_done(struct crypto_async_request *base, int err)
iph_base = AH_SKB_CB(skb)->tmp;
iph_ext = ah_tmp_ext(iph_base);
- icv = ah_tmp_icv(ahp->ahash, iph_ext, extlen);
+ icv = ah_tmp_icv(iph_ext, extlen);
memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
memcpy(top_iph, iph_base, IPV6HDR_BASELEN);
- if (extlen) {
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
- memcpy(&top_iph->saddr, iph_ext, extlen);
-#else
- memcpy(&top_iph->daddr, iph_ext, extlen);
-#endif
- }
+ ah6_restore_hdrs(top_iph, iph_ext, extlen);
kfree(AH_SKB_CB(skb)->tmp);
xfrm_output_resume(skb->sk, skb, err);
@@ -362,7 +381,7 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
iph_ext = ah_tmp_ext(iph_base);
seqhi = (__be32 *)((char *)iph_ext + extlen);
- icv = ah_tmp_icv(ahash, seqhi, seqhi_len);
+ icv = ah_tmp_icv(seqhi, seqhi_len);
req = ah_tmp_req(ahash, icv);
sg = ah_req_sg(ahash, req);
seqhisg = sg + nfrags;
@@ -381,12 +400,8 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
*/
memcpy(iph_base, top_iph, IPV6HDR_BASELEN);
+ ah6_save_hdrs(iph_ext, top_iph, extlen);
if (extlen) {
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
- memcpy(iph_ext, &top_iph->saddr, extlen);
-#else
- memcpy(iph_ext, &top_iph->daddr, extlen);
-#endif
err = ipv6_clear_mutable_options(top_iph,
extlen - sizeof(*iph_ext) +
sizeof(*top_iph),
@@ -437,13 +452,7 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
memcpy(top_iph, iph_base, IPV6HDR_BASELEN);
- if (extlen) {
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
- memcpy(&top_iph->saddr, iph_ext, extlen);
-#else
- memcpy(&top_iph->daddr, iph_ext, extlen);
-#endif
- }
+ ah6_restore_hdrs(top_iph, iph_ext, extlen);
out_free:
kfree(iph_base);
@@ -451,12 +460,12 @@ out:
return err;
}
-static void ah6_input_done(struct crypto_async_request *base, int err)
+static void ah6_input_done(void *data, int err)
{
u8 *auth_data;
u8 *icv;
u8 *work_iph;
- struct sk_buff *skb = base->data;
+ struct sk_buff *skb = data;
struct xfrm_state *x = xfrm_input_state(skb);
struct ah_data *ahp = x->data;
struct ip_auth_hdr *ah = ip_auth_hdr(skb);
@@ -468,7 +477,7 @@ static void ah6_input_done(struct crypto_async_request *base, int err)
work_iph = AH_SKB_CB(skb)->tmp;
auth_data = ah_tmp_auth(work_iph, hdr_len);
- icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);
+ icv = ah_tmp_icv(auth_data, ahp->icv_trunc_len);
err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0;
if (err)
@@ -576,7 +585,7 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
auth_data = ah_tmp_auth((u8 *)work_iph, hdr_len);
seqhi = (__be32 *)(auth_data + ahp->icv_trunc_len);
- icv = ah_tmp_icv(ahash, seqhi, seqhi_len);
+ icv = ah_tmp_icv(seqhi, seqhi_len);
req = ah_tmp_req(ahash, icv);
sg = ah_req_sg(ahash, req);
seqhisg = sg + nfrags;
@@ -666,30 +675,38 @@ static int ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
return 0;
}
-static int ah6_init_state(struct xfrm_state *x)
+static int ah6_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack)
{
struct ah_data *ahp = NULL;
struct xfrm_algo_desc *aalg_desc;
struct crypto_ahash *ahash;
- if (!x->aalg)
+ if (!x->aalg) {
+ NL_SET_ERR_MSG(extack, "AH requires a state with an AUTH algorithm");
goto error;
+ }
- if (x->encap)
+ if (x->encap) {
+ NL_SET_ERR_MSG(extack, "AH is not compatible with encapsulation");
goto error;
+ }
ahp = kzalloc(sizeof(*ahp), GFP_KERNEL);
if (!ahp)
return -ENOMEM;
ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0);
- if (IS_ERR(ahash))
+ if (IS_ERR(ahash)) {
+ NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations");
goto error;
+ }
ahp->ahash = ahash;
if (crypto_ahash_setkey(ahash, x->aalg->alg_key,
- (x->aalg->alg_key_len + 7) / 8))
+ (x->aalg->alg_key_len + 7) / 8)) {
+ NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations");
goto error;
+ }
/*
* Lookup the algorithm description maintained by xfrm_algo,
@@ -702,9 +719,7 @@ static int ah6_init_state(struct xfrm_state *x)
if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
crypto_ahash_digestsize(ahash)) {
- pr_info("AH: %s digestsize %u != %u\n",
- x->aalg->alg_name, crypto_ahash_digestsize(ahash),
- aalg_desc->uinfo.auth.icv_fullbits/8);
+ NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations");
goto error;
}
@@ -721,6 +736,7 @@ static int ah6_init_state(struct xfrm_state *x)
x->props.header_len += sizeof(struct ipv6hdr);
break;
default:
+ NL_SET_ERR_MSG(extack, "Invalid mode requested for AH, must be one of TRANSPORT, TUNNEL, BEET");
goto error;
}
x->data = ahp;
@@ -796,5 +812,6 @@ static void __exit ah6_fini(void)
module_init(ah6_init);
module_exit(ah6_fini);
+MODULE_DESCRIPTION("IPv6 AH transformation helpers");
MODULE_LICENSE("GPL");
MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_AH);
generated by cgit (git 2.34.1) at 2025-12-25 15:45:44 +0000