tcp md5sig: Share most of hash calcucaltion bits between IPv4 and IPv6.

We can share most part of the hash calculation code because
the only difference between IPv4 and IPv6 is their pseudo headers.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

1 files changed, 4 insertions, 48 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index f25445d21bdf..e331cdbd0953 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1006,15 +1006,9 @@ static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
                                    struct tcphdr *th,
                                    unsigned int tcplen)
 {
-        struct scatterlist sg[4];
-        __u16 data_len;
-        int block = 0;
-        __sum16 old_checksum;
         struct tcp_md5sig_pool *hp;
         struct tcp4_pseudohdr *bp;
-        struct hash_desc *desc;
         int err;
-        unsigned int nbytes = 0;
 
         /*
          * Okay, so RFC2385 is turned on for this connection,
@@ -1026,10 +1020,9 @@ static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
                 goto clear_hash_noput;
 
         bp = &hp->md5_blk.ip4;
-        desc = &hp->md5_desc;
 
         /*
-         * 1. the TCP pseudo-header (in the order: source IP address,
+         * The TCP pseudo-header (in the order: source IP address,
          * destination IP address, zero-padded protocol number, and
          * segment length)
          */
@@ -1039,50 +1032,13 @@ static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
         bp->protocol = IPPROTO_TCP;
         bp->len = htons(tcplen);
 
-        sg_init_table(sg, 4);
-
-        sg_set_buf(&sg[block++], bp, sizeof(*bp));
-        nbytes += sizeof(*bp);
-
-        /* 2. the TCP header, excluding options, and assuming a
-         * checksum of zero/
-         */
-        old_checksum = th->check;
-        th->check = 0;
-        sg_set_buf(&sg[block++], th, sizeof(struct tcphdr));
-        nbytes += sizeof(struct tcphdr);
-
-        /* 3. the TCP segment data (if any) */
-        data_len = tcplen - (th->doff << 2);
-        if (data_len > 0) {
-                unsigned char *data = (unsigned char *)th + (th->doff << 2);
-                sg_set_buf(&sg[block++], data, data_len);
-                nbytes += data_len;
-        }
-
-        /* 4. an independently-specified key or password, known to both
-         * TCPs and presumably connection-specific
-         */
-        sg_set_buf(&sg[block++], key->key, key->keylen);
-        nbytes += key->keylen;
-
-        sg_mark_end(&sg[block - 1]);
-
-        /* Now store the Hash into the packet */
-        err = crypto_hash_init(desc);
-        if (err)
-                goto clear_hash;
-        err = crypto_hash_update(desc, sg, nbytes);
-        if (err)
-                goto clear_hash;
-        err = crypto_hash_final(desc, md5_hash);
+        err = tcp_calc_md5_hash(md5_hash, key, sizeof(*bp),
+                                th, tcplen, hp);
         if (err)
                 goto clear_hash;
 
-        /* Reset header, and free up the crypto */
+        /* Free up the crypto pool */
         tcp_put_md5sig_pool();
-        th->check = old_checksum;
-
 out:
         return 0;
 clear_hash: