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ipv4: share tcp_v4_save_options() with cookie_v4_check() 

cookie_v4_check() allocates ip_options_rcu in the same way
with tcp_v4_save_options(), we can just make it a helper function.

Cc: Krzysztof Kolasa <kkolasa@winsoft.pl>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2014-10-15 14:33:21 -07:00 committed by David S. Miller
parent 2077eebf7d
commit e25f866fbc
3 changed files with 21 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
include/net/tcp.h
View File

@ -1666,4 +1666,24 @@ int tcpv4_offload_init(void);
void tcp_v4_init(void);
void tcp_init(void);
/*
* Save and compile IPv4 options, return a pointer to it
*/
static inline struct ip_options_rcu *tcp_v4_save_options(struct sk_buff *skb)
{
const struct ip_options *opt = &TCP_SKB_CB(skb)->header.h4.opt;
struct ip_options_rcu *dopt = NULL;
if (opt && opt->optlen) {
int opt_size = sizeof(*dopt) + opt->optlen;
dopt = kmalloc(opt_size, GFP_ATOMIC);
if (dopt && __ip_options_echo(&dopt->opt, skb, opt)) {
kfree(dopt);
dopt = NULL;
}
}
return dopt;
}
#endif /* _TCP_H */

10
net/ipv4/syncookies.c
View File

@ -317,15 +317,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
/* We throwed the options of the initial SYN away, so we hope
* the ACK carries the same options again (see RFC1122 4.2.3.8)
*/
if (opt && opt->optlen) {
int opt_size = sizeof(struct ip_options_rcu) + opt->optlen;
ireq->opt = kmalloc(opt_size, GFP_ATOMIC);
if (ireq->opt != NULL && __ip_options_echo(&ireq->opt->opt, skb, opt)) {
kfree(ireq->opt);
ireq->opt = NULL;
}
}
ireq->opt = tcp_v4_save_options(skb);
if (security_inet_conn_request(sk, skb, req)) {
reqsk_free(req);

20
net/ipv4/tcp_ipv4.c
View File

@ -880,26 +880,6 @@ bool tcp_syn_flood_action(struct sock *sk,
}
EXPORT_SYMBOL(tcp_syn_flood_action);
/*
* Save and compile IPv4 options into the request_sock if needed.
*/
static struct ip_options_rcu *tcp_v4_save_options(struct sk_buff *skb)
{
const struct ip_options *opt = &TCP_SKB_CB(skb)->header.h4.opt;
struct ip_options_rcu *dopt = NULL;
if (opt && opt->optlen) {
int opt_size = sizeof(*dopt) + opt->optlen;
dopt = kmalloc(opt_size, GFP_ATOMIC);
if (dopt && __ip_options_echo(&dopt->opt, skb, opt)) {
kfree(dopt);
dopt = NULL;
}
}
return dopt;
}
#ifdef CONFIG_TCP_MD5SIG
/*
* RFC2385 MD5 checksumming requires a mapping of