diff --git a/include/net/tcp.h b/include/net/tcp.h
index ae2549c45fc7e9e28b87001c152436cbd78aa4bf..eac26b73bcc3f717c02d93d9ed1e2b6ce7e8fb1c 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1117,6 +1117,13 @@ struct tcp_md5sig_pool {
#define TCP_MD5SIG_MAXKEYS (~(u32)0) /* really?! */
/* - functions */
+extern int tcp_calc_md5_hash(char *md5_hash,
+ struct tcp_md5sig_key *key,
+ int bplen,
+ struct tcphdr *th,
+ unsigned int tcplen,
+ struct tcp_md5sig_pool *hp);
+
extern int tcp_v4_calc_md5_hash(char *md5_hash,
struct tcp_md5sig_key *key,
struct sock *sk,
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index ab66683b804343fc852b93220d41e83d80275512..6efbae0e5512e7e0d29e8235a9fe9c5679452c4f 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2459,6 +2459,76 @@ static unsigned long tcp_md5sig_users;
static struct tcp_md5sig_pool **tcp_md5sig_pool;
static DEFINE_SPINLOCK(tcp_md5sig_pool_lock);
+int tcp_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
+ int bplen,
+ struct tcphdr *th, unsigned int tcplen,
+ struct tcp_md5sig_pool *hp)
+{
+ struct scatterlist sg[4];
+ __u16 data_len;
+ int block = 0;
+ __sum16 cksum;
+ struct hash_desc *desc = &hp->md5_desc;
+ int err;
+ unsigned int nbytes = 0;
+
+ sg_init_table(sg, 4);
+
+ /* 1. The TCP pseudo-header */
+ sg_set_buf(&sg[block++], &hp->md5_blk, bplen);
+ nbytes += bplen;
+
+ /* 2. The TCP header, excluding options, and assuming a
+ * checksum of zero
+ */
+ cksum = th->check;
+ th->check = 0;
+ sg_set_buf(&sg[block++], th, sizeof(*th));
+ nbytes += sizeof(*th);
+
+ /* 3. The TCP segment data (if any) */
+ data_len = tcplen - (th->doff << 2);
+ if (data_len > 0) {
+ u8 *data = (u8 *)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) {
+ if (net_ratelimit())
+ printk(KERN_WARNING "%s(): hash_init failed\n", __func__);
+ return -1;
+ }
+ err = crypto_hash_update(desc, sg, nbytes);
+ if (err) {
+ if (net_ratelimit())
+ printk(KERN_WARNING "%s(): hash_update failed\n", __func__);
+ return -1;
+ }
+ err = crypto_hash_final(desc, md5_hash);
+ if (err) {
+ if (net_ratelimit())
+ printk(KERN_WARNING "%s(): hash_final failed\n", __func__);
+ return -1;
+ }
+
+ /* Reset header */
+ th->check = cksum;
+
+ return 0;
+}
+EXPORT_SYMBOL(tcp_calc_md5_hash);
+
static void __tcp_free_md5sig_pool(struct tcp_md5sig_pool **pool)
{
int cpu;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index f25445d21bdf1cbaa56612d91553951c5088e52f..e331cdbd09537e7cb5e02a4a76aeff31b73c3c8d 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:
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 334d21c23da9b3bd741f59de3b95187c89c8f3c5..0ae0311082fbd22a47163b429d0423a3b88ea863 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -738,23 +738,17 @@ static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
struct in6_addr *daddr,
struct tcphdr *th, unsigned int tcplen)
{
- struct scatterlist sg[4];
- __u16 data_len;
- int block = 0;
- __sum16 cksum;
struct tcp_md5sig_pool *hp;
struct tcp6_pseudohdr *bp;
- struct hash_desc *desc;
int err;
- unsigned int nbytes = 0;
hp = tcp_get_md5sig_pool();
if (!hp) {
printk(KERN_WARNING "%s(): hash pool not found...\n", __func__);
goto clear_hash_noput;
}
+
bp = &hp->md5_blk.ip6;
- desc = &hp->md5_desc;
/* 1. TCP pseudo-header (RFC2460) */
ipv6_addr_copy(&bp->saddr, saddr);
@@ -762,51 +756,14 @@ static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
bp->len = htonl(tcplen);
bp->protocol = htonl(IPPROTO_TCP);
- sg_init_table(sg, 4);
-
- sg_set_buf(&sg[block++], bp, sizeof(*bp));
- nbytes += sizeof(*bp);
-
- /* 2. TCP header, excluding options */
- cksum = th->check;
- th->check = 0;
- sg_set_buf(&sg[block++], th, sizeof(*th));
- nbytes += sizeof(*th);
-
- /* 3. TCP segment data (if any) */
- data_len = tcplen - (th->doff << 2);
- if (data_len > 0) {
- u8 *data = (u8 *)th + (th->doff << 2);
- sg_set_buf(&sg[block++], data, data_len);
- nbytes += data_len;
- }
-
- /* 4. shared key */
- sg_set_buf(&sg[block++], key->key, key->keylen);
- nbytes += key->keylen;
-
- sg_mark_end(&sg[block - 1]);
+ err = tcp_calc_md5_hash(md5_hash, key, sizeof(*bp),
+ th, tcplen, hp);
- /* Now store the hash into the packet */
- err = crypto_hash_init(desc);
- if (err) {
- printk(KERN_WARNING "%s(): hash_init failed\n", __func__);
- goto clear_hash;
- }
- err = crypto_hash_update(desc, sg, nbytes);
- if (err) {
- printk(KERN_WARNING "%s(): hash_update failed\n", __func__);
- goto clear_hash;
- }
- err = crypto_hash_final(desc, md5_hash);
- if (err) {
- printk(KERN_WARNING "%s(): hash_final failed\n", __func__);
+ if (err)
goto clear_hash;
- }
- /* Reset header, and free up the crypto */
+ /* Free up the crypto pool */
tcp_put_md5sig_pool();
- th->check = cksum;
out:
return 0;
clear_hash: