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ipv4/tcp: Use local variable for tcp_md5_addr

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Extract the typecast to (union tcp_md5_addr *) to a local variable
rather than the current long, inline declaration with function calls.

No functional change intended.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-12-30 14:14:25 -08:00 committed by David S. Miller
parent 98c8147648
commit cea9760950
1 changed files with 26 additions and 17 deletions
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43
net/ipv4/tcp_ipv4.c
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@ -701,9 +701,13 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
rcu_read_lock();
hash_location = tcp_parse_md5sig_option(th);
if (sk && sk_fullsock(sk)) {
key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)
&ip_hdr(skb)->saddr, AF_INET);
const union tcp_md5_addr *addr;
addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
key = tcp_md5_do_lookup(sk, addr, AF_INET);
} else if (hash_location) {
const union tcp_md5_addr *addr;
/*
* active side is lost. Try to find listening socket through
* source port, and then find md5 key through listening socket.
@ -720,8 +724,8 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
if (!sk1)
goto out;
key = tcp_md5_do_lookup(sk1, (union tcp_md5_addr *)
&ip_hdr(skb)->saddr, AF_INET);
addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
key = tcp_md5_do_lookup(sk1, addr, AF_INET);
if (!key)
goto out;
@ -905,6 +909,8 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
struct request_sock *req)
{
const union tcp_md5_addr *addr;
/* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
* sk->sk_state == TCP_SYN_RECV -> for Fast Open.
*/
@ -916,14 +922,14 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
* exception of <SYN> segments, MUST be right-shifted by
* Rcv.Wind.Shift bits:
*/
addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
tcp_v4_send_ack(sk, skb, seq,
tcp_rsk(req)->rcv_nxt,
req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale,
tcp_time_stamp_raw() + tcp_rsk(req)->ts_off,
req->ts_recent,
0,
tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&ip_hdr(skb)->saddr,
AF_INET),
tcp_md5_do_lookup(sk, addr, AF_INET),
inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0,
ip_hdr(skb)->tos);
}
@ -1149,6 +1155,7 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname,
{
struct tcp_md5sig cmd;
struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr;
const union tcp_md5_addr *addr;
u8 prefixlen = 32;
if (optlen < sizeof(cmd))
@ -1167,16 +1174,16 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname,
return -EINVAL;
}
addr = (union tcp_md5_addr *)&sin->sin_addr.s_addr;
if (!cmd.tcpm_keylen)
return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr,
AF_INET, prefixlen);
return tcp_md5_do_del(sk, addr, AF_INET, prefixlen);
if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
return -EINVAL;
return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr,
AF_INET, prefixlen, cmd.tcpm_key, cmd.tcpm_keylen,
GFP_KERNEL);
return tcp_md5_do_add(sk, addr, AF_INET, prefixlen,
cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
}
static int tcp_v4_md5_hash_headers(struct tcp_md5sig_pool *hp,
@ -1301,11 +1308,12 @@ static bool tcp_v4_inbound_md5_hash(const struct sock *sk,
struct tcp_md5sig_key *hash_expected;
const struct iphdr *iph = ip_hdr(skb);
const struct tcphdr *th = tcp_hdr(skb);
const union tcp_md5_addr *addr;
int genhash;
unsigned char newhash[16];
hash_expected = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&iph->saddr,
AF_INET);
addr = (union tcp_md5_addr *)&iph->saddr;
hash_expected = tcp_md5_do_lookup(sk, addr, AF_INET);
hash_location = tcp_parse_md5sig_option(th);
/* We've parsed the options - do we have a hash? */
@ -1419,6 +1427,7 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
struct tcp_sock *newtp;
struct sock *newsk;
#ifdef CONFIG_TCP_MD5SIG
const union tcp_md5_addr *addr;
struct tcp_md5sig_key *key;
#endif
struct ip_options_rcu *inet_opt;
@ -1468,8 +1477,8 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
#ifdef CONFIG_TCP_MD5SIG
/* Copy over the MD5 key from the original socket */
key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&newinet->inet_daddr,
AF_INET);
addr = (union tcp_md5_addr *)&newinet->inet_daddr;
key = tcp_md5_do_lookup(sk, addr, AF_INET);
if (key) {
/*
* We're using one, so create a matching key
@ -1477,8 +1486,8 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
* memory, then we end up not copying the key
* across. Shucks.
*/
tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newinet->inet_daddr,
AF_INET, 32, key->key, key->keylen, GFP_ATOMIC);
tcp_md5_do_add(newsk, addr, AF_INET, 32,
key->key, key->keylen, GFP_ATOMIC);
sk_nocaps_add(newsk, NETIF_F_GSO_MASK);
}
#endif