ah6: convert to ahash

This patch converts ah6 to the new ahash interface.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 272 insertions, 80 deletions

diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index c1589e2f1dc9..0f526f8ea518 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -24,18 +24,92 @@
  *      This file is derived from net/ipv4/ah.c.
  */
 
+#include <crypto/hash.h>
 #include <linux/module.h>
 #include <net/ip.h>
 #include <net/ah.h>
 #include <linux/crypto.h>
 #include <linux/pfkeyv2.h>
-#include <linux/spinlock.h>
 #include <linux/string.h>
+#include <linux/scatterlist.h>
 #include <net/icmp.h>
 #include <net/ipv6.h>
 #include <net/protocol.h>
 #include <net/xfrm.h>
 
+#define IPV6HDR_BASELEN 8
+
+struct tmp_ext {
+#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
+                struct in6_addr saddr;
+#endif
+                struct in6_addr daddr;
+                char hdrs[0];
+};
+
+struct ah_skb_cb {
+        struct xfrm_skb_cb xfrm;
+        void *tmp;
+};
+
+#define AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0]))
+
+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 = ALIGN(len, crypto_tfm_ctx_alignment());
+
+        len += sizeof(struct ahash_request) + crypto_ahash_reqsize(ahash);
+        len = ALIGN(len, __alignof__(struct scatterlist));
+
+        len += sizeof(struct scatterlist) * nfrags;
+
+        return kmalloc(len, GFP_ATOMIC);
+}
+
+static inline struct tmp_ext *ah_tmp_ext(void *base)
+{
+        return base + IPV6HDR_BASELEN;
+}
+
+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)
+{
+        return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1);
+}
+
+static inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash,
+                                               u8 *icv)
+{
+        struct ahash_request *req;
+
+        req = (void *)PTR_ALIGN(icv + crypto_ahash_digestsize(ahash),
+                                crypto_tfm_ctx_alignment());
+
+        ahash_request_set_tfm(req, ahash);
+
+        return req;
+}
+
+static inline struct scatterlist *ah_req_sg(struct crypto_ahash *ahash,
+                                             struct ahash_request *req)
+{
+        return (void *)ALIGN((unsigned long)(req + 1) +
+                             crypto_ahash_reqsize(ahash),
+                             __alignof__(struct scatterlist));
+}
+
 static int zero_out_mutable_opts(struct ipv6_opt_hdr *opthdr)
 {
         u8 *opt = (u8 *)opthdr;
@@ -218,24 +292,85 @@ 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)
+{
+        int extlen;
+        u8 *iph_base;
+        u8 *icv;
+        struct sk_buff *skb = base->data;
+        struct xfrm_state *x = skb_dst(skb)->xfrm;
+        struct ah_data *ahp = x->data;
+        struct ipv6hdr *top_iph = ipv6_hdr(skb);
+        struct ip_auth_hdr *ah = ip_auth_hdr(skb);
+        struct tmp_ext *iph_ext;
+
+        extlen = skb_network_header_len(skb) - sizeof(struct ipv6hdr);
+        if (extlen)
+                extlen += sizeof(*iph_ext);
+
+        iph_base = AH_SKB_CB(skb)->tmp;
+        iph_ext = ah_tmp_ext(iph_base);
+        icv = ah_tmp_icv(ahp->ahash, iph_ext, extlen);
+
+        memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
+        memcpy(top_iph, iph_base, IPV6HDR_BASELEN);
+
+        if (extlen) {
+#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
+                memcpy(&top_iph->saddr, iph_ext, extlen);
+#else
+                memcpy(&top_iph->daddr, iph_ext, extlen);
+#endif
+        }
+
+        err = ah->nexthdr;
+
+        kfree(AH_SKB_CB(skb)->tmp);
+        xfrm_output_resume(skb, err);
+}
+
 static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
 {
         int err;
+        int nfrags;
         int extlen;
+        u8 *iph_base;
+        u8 *icv;
+        u8 nexthdr;
+        struct sk_buff *trailer;
+        struct crypto_ahash *ahash;
+        struct ahash_request *req;
+        struct scatterlist *sg;
         struct ipv6hdr *top_iph;
         struct ip_auth_hdr *ah;
         struct ah_data *ahp;
-        u8 nexthdr;
-        char tmp_base[8];
-        struct {
-#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
-                struct in6_addr saddr;
-#endif
-                struct in6_addr daddr;
-                char hdrs[0];
-        } *tmp_ext;
+        struct tmp_ext *iph_ext;
+
+        ahp = x->data;
+        ahash = ahp->ahash;
+
+        if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
+                goto out;
+        nfrags = err;
 
         skb_push(skb, -skb_network_offset(skb));
+        extlen = skb_network_header_len(skb) - sizeof(struct ipv6hdr);
+        if (extlen)
+                extlen += sizeof(*iph_ext);
+
+        err = -ENOMEM;
+        iph_base = ah_alloc_tmp(ahash, nfrags, IPV6HDR_BASELEN + extlen);
+        if (!iph_base)
+                goto out;
+
+        iph_ext = ah_tmp_ext(iph_base);
+        icv = ah_tmp_icv(ahash, iph_ext, extlen);
+        req = ah_tmp_req(ahash, icv);
+        sg = ah_req_sg(ahash, req);
+
+        ah = ip_auth_hdr(skb);
+        memset(ah->auth_data, 0, ahp->icv_trunc_len);
+
         top_iph = ipv6_hdr(skb);
         top_iph->payload_len = htons(skb->len - sizeof(*top_iph));
 
@@ -245,31 +380,22 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
         /* 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));
+        memcpy(iph_base, top_iph, IPV6HDR_BASELEN);
 
-        tmp_ext = NULL;
-        extlen = skb_transport_offset(skb) - sizeof(struct ipv6hdr);
         if (extlen) {
-                extlen += sizeof(*tmp_ext);
-                tmp_ext = kmalloc(extlen, GFP_ATOMIC);
-                if (!tmp_ext) {
-                        err = -ENOMEM;
-                        goto error;
-                }
 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
-                memcpy(tmp_ext, &top_iph->saddr, extlen);
+                memcpy(iph_ext, &top_iph->saddr, extlen);
 #else
-                memcpy(tmp_ext, &top_iph->daddr, extlen);
+                memcpy(iph_ext, &top_iph->daddr, extlen);
 #endif
                 err = ipv6_clear_mutable_options(top_iph,
-                                                 extlen - sizeof(*tmp_ext) +
+                                                 extlen - sizeof(*iph_ext) +
                                                  sizeof(*top_iph),
                                                  XFRM_POLICY_OUT);
                 if (err)
-                        goto error_free_iph;
+                        goto out_free;
         }
 
-        ah = ip_auth_hdr(skb);
         ah->nexthdr = nexthdr;
 
         top_iph->priority    = 0;
@@ -278,36 +404,80 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
         top_iph->flow_lbl[2] = 0;
         top_iph->hop_limit   = 0;
 
-        ahp = x->data;
         ah->hdrlen  = (XFRM_ALIGN8(sizeof(*ah) + ahp->icv_trunc_len) >> 2) - 2;
 
         ah->reserved = 0;
         ah->spi = x->id.spi;
         ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output);
 
-        spin_lock_bh(&x->lock);
-        err = ah_mac_digest(ahp, skb, ah->auth_data);
-        memcpy(ah->auth_data, ahp->work_icv, ahp->icv_trunc_len);
-        spin_unlock_bh(&x->lock);
+        sg_init_table(sg, nfrags);
+        skb_to_sgvec(skb, sg, 0, skb->len);
 
-        if (err)
-                goto error_free_iph;
+        ahash_request_set_crypt(req, sg, icv, skb->len);
+        ahash_request_set_callback(req, 0, ah6_output_done, skb);
+
+        AH_SKB_CB(skb)->tmp = iph_base;
 
-        memcpy(top_iph, tmp_base, sizeof(tmp_base));
-        if (tmp_ext) {
+        err = crypto_ahash_digest(req);
+        if (err) {
+                if (err == -EINPROGRESS)
+                        goto out;
+
+                if (err == -EBUSY)
+                        err = NET_XMIT_DROP;
+                goto out_free;
+        }
+
+        memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
+        memcpy(top_iph, iph_base, IPV6HDR_BASELEN);
+
+        if (extlen) {
 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
-                memcpy(&top_iph->saddr, tmp_ext, extlen);
+                memcpy(&top_iph->saddr, iph_ext, extlen);
 #else
-                memcpy(&top_iph->daddr, tmp_ext, extlen);
+                memcpy(&top_iph->daddr, iph_ext, extlen);
 #endif
-error_free_iph:
-                kfree(tmp_ext);
         }
 
-error:
+out_free:
+        kfree(iph_base);
+out:
         return err;
 }
 
+static void ah6_input_done(struct crypto_async_request *base, int err)
+{
+        u8 *auth_data;
+        u8 *icv;
+        u8 *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 hdr_len = skb_network_header_len(skb);
+        int ah_hlen = (ah->hdrlen + 2) << 2;
+
+        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);
+
+        err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG: 0;
+        if (err)
+                goto out;
+
+        skb->network_header += ah_hlen;
+        memcpy(skb_network_header(skb), work_iph, hdr_len);
+        __skb_pull(skb, ah_hlen + hdr_len);
+        skb_set_transport_header(skb, -hdr_len);
+
+        err = ah->nexthdr;
+out:
+        kfree(AH_SKB_CB(skb)->tmp);
+        xfrm_input_resume(skb, err);
+}
+
+
+
 static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
 {
         /*
@@ -325,14 +495,21 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
          * There is offset of AH before IPv6 header after the process.
          */
 
+        u8 *auth_data;
+        u8 *icv;
+        u8 *work_iph;
+        struct sk_buff *trailer;
+        struct crypto_ahash *ahash;
+        struct ahash_request *req;
+        struct scatterlist *sg;
         struct ip_auth_hdr *ah;
         struct ipv6hdr *ip6h;
         struct ah_data *ahp;
-        unsigned char *tmp_hdr = NULL;
         u16 hdr_len;
         u16 ah_hlen;
         int nexthdr;
-        int err = -EINVAL;
+        int nfrags;
+        int err = -ENOMEM;
 
         if (!pskb_may_pull(skb, sizeof(struct ip_auth_hdr)))
                 goto out;
@@ -345,9 +522,11 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
 
         skb->ip_summed = CHECKSUM_NONE;
 
-        hdr_len = skb->data - skb_network_header(skb);
+        hdr_len = skb_network_header_len(skb);
         ah = (struct ip_auth_hdr *)skb->data;
         ahp = x->data;
+        ahash = ahp->ahash;
+
         nexthdr = ah->nexthdr;
         ah_hlen = (ah->hdrlen + 2) << 2;
 
@@ -358,48 +537,67 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
         if (!pskb_may_pull(skb, ah_hlen))
                 goto out;
 
-        tmp_hdr = kmemdup(skb_network_header(skb), hdr_len, GFP_ATOMIC);
-        if (!tmp_hdr)
-                goto out;
         ip6h = ipv6_hdr(skb);
+
+        skb_push(skb, hdr_len);
+
+        if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
+                goto out;
+        nfrags = err;
+
+        work_iph = ah_alloc_tmp(ahash, nfrags, hdr_len + ahp->icv_trunc_len);
+        if (!work_iph)
+                goto out;
+
+        auth_data = ah_tmp_auth(work_iph, hdr_len);
+        icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_len);
+        req = ah_tmp_req(ahash, icv);
+        sg = ah_req_sg(ahash, req);
+
+        memcpy(work_iph, ip6h, hdr_len);
+        memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
+        memset(ah->auth_data, 0, ahp->icv_trunc_len);
+
         if (ipv6_clear_mutable_options(ip6h, hdr_len, XFRM_POLICY_IN))
-                goto free_out;
+                goto out_free;
+
         ip6h->priority    = 0;
         ip6h->flow_lbl[0] = 0;
         ip6h->flow_lbl[1] = 0;
         ip6h->flow_lbl[2] = 0;
         ip6h->hop_limit   = 0;
 
-        spin_lock(&x->lock);
-        {
-                u8 auth_data[MAX_AH_AUTH_LEN];
+        sg_init_table(sg, nfrags);
+        skb_to_sgvec(skb, sg, 0, skb->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 unlock;
-                if (memcmp(ahp->work_icv, auth_data, ahp->icv_trunc_len))
-                        err = -EBADMSG;
+        ahash_request_set_crypt(req, sg, icv, skb->len);
+        ahash_request_set_callback(req, 0, ah6_input_done, skb);
+
+        AH_SKB_CB(skb)->tmp = work_iph;
+
+        err = crypto_ahash_digest(req);
+        if (err) {
+                if (err == -EINPROGRESS)
+                        goto out;
+
+                if (err == -EBUSY)
+                        err = NET_XMIT_DROP;
+                goto out_free;
         }
-unlock:
-        spin_unlock(&x->lock);
 
+        err = memcmp(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG: 0;
         if (err)
-                goto free_out;
+                goto out_free;
 
         skb->network_header += ah_hlen;
-        memcpy(skb_network_header(skb), tmp_hdr, hdr_len);
+        memcpy(skb_network_header(skb), work_iph, hdr_len);
         skb->transport_header = skb->network_header;
         __skb_pull(skb, ah_hlen + hdr_len);
 
-        kfree(tmp_hdr);
+        err = nexthdr;
 
-        return nexthdr;
-
-free_out:
-        kfree(tmp_hdr);
+out_free:
+        kfree(work_iph);
 out:
         return err;
 }
@@ -430,7 +628,7 @@ static int ah6_init_state(struct xfrm_state *x)
 {
         struct ah_data *ahp = NULL;
         struct xfrm_algo_desc *aalg_desc;
-        struct crypto_hash *tfm;
+        struct crypto_ahash *ahash;
 
         if (!x->aalg)
                 goto error;
@@ -442,12 +640,12 @@ static int ah6_init_state(struct xfrm_state *x)
         if (ahp == NULL)
                 return -ENOMEM;
 
-        tfm = crypto_alloc_hash(x->aalg->alg_name, 0, CRYPTO_ALG_ASYNC);
-        if (IS_ERR(tfm))
+        ahash = crypto_alloc_ahash(x->aalg->alg_name, 0, 0);
+        if (IS_ERR(ahash))
                 goto error;
 
-        ahp->tfm = tfm;
-        if (crypto_hash_setkey(tfm, x->aalg->alg_key,
+        ahp->ahash = ahash;
+        if (crypto_ahash_setkey(ahash, x->aalg->alg_key,
                                (x->aalg->alg_key_len + 7) / 8))
                 goto error;
 
@@ -461,9 +659,9 @@ static int ah6_init_state(struct xfrm_state *x)
         BUG_ON(!aalg_desc);
 
         if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
-            crypto_hash_digestsize(tfm)) {
+            crypto_ahash_digestsize(ahash)) {
                 printk(KERN_INFO "AH: %s digestsize %u != %hu\n",
-                       x->aalg->alg_name, crypto_hash_digestsize(tfm),
+                       x->aalg->alg_name, crypto_ahash_digestsize(ahash),
                        aalg_desc->uinfo.auth.icv_fullbits/8);
                 goto error;
         }
@@ -473,10 +671,6 @@ static int ah6_init_state(struct xfrm_state *x)
 
         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 ip_auth_hdr) +
                                           ahp->icv_trunc_len);
         switch (x->props.mode) {
@@ -495,8 +689,7 @@ static int ah6_init_state(struct xfrm_state *x)
 
 error:
         if (ahp) {
-                kfree(ahp->work_icv);
-                crypto_free_hash(ahp->tfm);
+                crypto_free_ahash(ahp->ahash);
                 kfree(ahp);
         }
         return -EINVAL;
@@ -509,8 +702,7 @@ static void ah6_destroy(struct xfrm_state *x)
         if (!ahp)
                 return;
 
-        kfree(ahp->work_icv);
-        crypto_free_hash(ahp->tfm);
+        crypto_free_ahash(ahp->ahash);
         kfree(ahp);
 }