[XFRM]: Add XFRM_MODE_xxx for future use.
[linux-2.6.git] / net / ipv4 / ah4.c
index aed537f..9954297 100644 (file)
@@ -1,4 +1,4 @@
-#include <linux/config.h>
+#include <linux/err.h>
 #include <linux/module.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
@@ -35,7 +35,7 @@ static int ip_clear_mutable_options(struct iphdr *iph, u32 *daddr)
                switch (*optptr) {
                case IPOPT_SEC:
                case 0x85:      /* Some "Extended Security" crap. */
-               case 0x86:      /* Another "Commercial Security" crap. */
+               case IPOPT_CIPSO:
                case IPOPT_RA:
                case 0x80|21:   /* RFC1770 */
                        break;
@@ -97,7 +97,11 @@ static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
        ah->reserved = 0;
        ah->spi = x->id.spi;
        ah->seq_no = htonl(++x->replay.oseq);
-       ahp->icv(ahp, skb, ah->auth_data);
+       xfrm_aevent_doreplay(x);
+       err = ah_mac_digest(ahp, skb, ah->auth_data);
+       if (err)
+               goto error;
+       memcpy(ah->auth_data, ahp->work_icv, ahp->icv_trunc_len);
 
        top_iph->tos = iph->tos;
        top_iph->ttl = iph->ttl;
@@ -115,9 +119,11 @@ error:
        return err;
 }
 
-static int ah_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb)
+static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
 {
        int ah_hlen;
+       int ihl;
+       int err = -EINVAL;
        struct iphdr *iph;
        struct ip_auth_hdr *ah;
        struct ah_data *ahp;
@@ -148,13 +154,14 @@ static int ah_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct
        ah = (struct ip_auth_hdr*)skb->data;
        iph = skb->nh.iph;
 
-       memcpy(work_buf, iph, iph->ihl*4);
+       ihl = skb->data - skb->nh.raw;
+       memcpy(work_buf, iph, ihl);
 
        iph->ttl = 0;
        iph->tos = 0;
        iph->frag_off = 0;
        iph->check = 0;
-       if (iph->ihl != 5) {
+       if (ihl > sizeof(*iph)) {
                u32 dummy;
                if (ip_clear_mutable_options(iph, &dummy))
                        goto out;
@@ -163,24 +170,24 @@ static int ah_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct
                u8 auth_data[MAX_AH_AUTH_LEN];
                
                memcpy(auth_data, ah->auth_data, ahp->icv_trunc_len);
-               skb_push(skb, skb->data - skb->nh.raw);
-               ahp->icv(ahp, skb, ah->auth_data);
-               if (memcmp(ah->auth_data, auth_data, ahp->icv_trunc_len)) {
+               skb_push(skb, ihl);
+               err = ah_mac_digest(ahp, skb, ah->auth_data);
+               if (err)
+                       goto out;
+               err = -EINVAL;
+               if (memcmp(ahp->work_icv, auth_data, ahp->icv_trunc_len)) {
                        x->stats.integrity_failed++;
                        goto out;
                }
        }
        ((struct iphdr*)work_buf)->protocol = ah->nexthdr;
-       skb->nh.raw = skb_pull(skb, ah_hlen);
-       memcpy(skb->nh.raw, work_buf, iph->ihl*4);
-       skb->nh.iph->tot_len = htons(skb->len);
-       skb_pull(skb, skb->nh.iph->ihl*4);
-       skb->h.raw = skb->data;
+       skb->h.raw = memcpy(skb->nh.raw += ah_hlen, work_buf, ihl);
+       __skb_pull(skb, ah_hlen + ihl);
 
        return 0;
 
 out:
-       return -EINVAL;
+       return err;
 }
 
 static void ah4_err(struct sk_buff *skb, u32 info)
@@ -205,6 +212,7 @@ static int ah_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;
@@ -216,32 +224,33 @@ static int ah_init_state(struct xfrm_state *x)
        if (x->encap)
                goto error;
 
-       ahp = kmalloc(sizeof(*ahp), GFP_KERNEL);
+       ahp = kzalloc(sizeof(*ahp), GFP_KERNEL);
        if (ahp == NULL)
                return -ENOMEM;
 
-       memset(ahp, 0, sizeof(*ahp));
-
        ahp->key = x->aalg->alg_key;
        ahp->key_len = (x->aalg->alg_key_len+7)/8;
-       ahp->tfm = crypto_alloc_tfm(x->aalg->alg_name, 0);
-       if (!ahp->tfm)
+       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;
-       ahp->icv = ah_hmac_digest;
        
        /*
         * 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_tfm().
+        * 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_tfm_alg_digestsize(ahp->tfm)) {
+           crypto_hash_digestsize(tfm)) {
                printk(KERN_INFO "AH: %s digestsize %u != %hu\n",
-                      x->aalg->alg_name, crypto_tfm_alg_digestsize(ahp->tfm),
+                      x->aalg->alg_name, crypto_hash_digestsize(tfm),
                       aalg_desc->uinfo.auth.icv_fullbits/8);
                goto error;
        }
@@ -256,7 +265,7 @@ static int ah_init_state(struct xfrm_state *x)
                goto error;
        
        x->props.header_len = XFRM_ALIGN8(sizeof(struct ip_auth_hdr) + ahp->icv_trunc_len);
-       if (x->props.mode)
+       if (x->props.mode == XFRM_MODE_TUNNEL)
                x->props.header_len += sizeof(struct iphdr);
        x->data = ahp;
 
@@ -265,7 +274,7 @@ static int ah_init_state(struct xfrm_state *x)
 error:
        if (ahp) {
                kfree(ahp->work_icv);
-               crypto_free_tfm(ahp->tfm);
+               crypto_free_hash(ahp->tfm);
                kfree(ahp);
        }
        return -EINVAL;
@@ -280,7 +289,7 @@ static void ah_destroy(struct xfrm_state *x)
 
        kfree(ahp->work_icv);
        ahp->work_icv = NULL;
-       crypto_free_tfm(ahp->tfm);
+       crypto_free_hash(ahp->tfm);
        ahp->tfm = NULL;
        kfree(ahp);
 }