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path: root/net/ipv4/tcp_ipv4.c
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Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
-rw-r--r--net/ipv4/tcp_ipv4.c31
1 files changed, 14 insertions, 17 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 3708de2a6683..32b048e524d6 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1018,27 +1018,28 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval,
GFP_KERNEL);
}
-static int tcp_v4_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
- __be32 daddr, __be32 saddr, int nbytes)
+static int tcp_v4_md5_hash_headers(struct tcp_md5sig_pool *hp,
+ __be32 daddr, __be32 saddr,
+ const struct tcphdr *th, int nbytes)
{
struct tcp4_pseudohdr *bp;
struct scatterlist sg;
+ struct tcphdr *_th;
- bp = &hp->md5_blk.ip4;
-
- /*
- * 1. the TCP pseudo-header (in the order: source IP address,
- * destination IP address, zero-padded protocol number, and
- * segment length)
- */
+ bp = hp->scratch;
bp->saddr = saddr;
bp->daddr = daddr;
bp->pad = 0;
bp->protocol = IPPROTO_TCP;
bp->len = cpu_to_be16(nbytes);
- sg_init_one(&sg, bp, sizeof(*bp));
- ahash_request_set_crypt(hp->md5_req, &sg, NULL, sizeof(*bp));
+ _th = (struct tcphdr *)(bp + 1);
+ memcpy(_th, th, sizeof(*th));
+ _th->check = 0;
+
+ sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th));
+ ahash_request_set_crypt(hp->md5_req, &sg, NULL,
+ sizeof(*bp) + sizeof(*th));
return crypto_ahash_update(hp->md5_req);
}
@@ -1055,9 +1056,7 @@ static int tcp_v4_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key,
if (crypto_ahash_init(req))
goto clear_hash;
- if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2))
- goto clear_hash;
- if (tcp_md5_hash_header(hp, th))
+ if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2))
goto clear_hash;
if (tcp_md5_hash_key(hp, key))
goto clear_hash;
@@ -1101,9 +1100,7 @@ int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key,
if (crypto_ahash_init(req))
goto clear_hash;
- if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, skb->len))
- goto clear_hash;
- if (tcp_md5_hash_header(hp, th))
+ if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, skb->len))
goto clear_hash;
if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
goto clear_hash;