tcp_hdr(skb) and SYN Cookie are passed to __cookie_v[46]_check(), but
none of the callers passes cookie other than ntohl(th->ack_seq) - 1.
Let's fetch it in __cookie_v[46]_check() instead of passing the cookie
over and over.
Signed-off-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
---
include/linux/netfilter_ipv6.h | 8 ++++----
include/net/tcp.h | 6 ++----
net/core/filter.c | 15 ++++-----------
net/ipv4/syncookies.c | 15 ++++++++-------
net/ipv6/syncookies.c | 15 ++++++++-------
net/netfilter/nf_synproxy_core.c | 4 ++--
6 files changed, 28 insertions(+), 35 deletions(-)
diff --git a/include/linux/netfilter_ipv6.h b/include/linux/netfilter_ipv6.h
index 7834c0be2831..61aa48f46dd7 100644
--- a/include/linux/netfilter_ipv6.h
+++ b/include/linux/netfilter_ipv6.h
@@ -51,7 +51,7 @@ struct nf_ipv6_ops {
u32 (*cookie_init_sequence)(const struct ipv6hdr *iph,
const struct tcphdr *th, u16 *mssp);
int (*cookie_v6_check)(const struct ipv6hdr *iph,
- const struct tcphdr *th, __u32 cookie);
+ const struct tcphdr *th);
#endif
void (*route_input)(struct sk_buff *skb);
int (*fragment)(struct net *net, struct sock *sk, struct sk_buff *skb,
@@ -179,16 +179,16 @@ static inline u32 nf_ipv6_cookie_init_sequence(const struct ipv6hdr *iph,
}
static inline int nf_cookie_v6_check(const struct ipv6hdr *iph,
- const struct tcphdr *th, __u32 cookie)
+ const struct tcphdr *th)
{
#if IS_ENABLED(CONFIG_SYN_COOKIES)
#if IS_MODULE(CONFIG_IPV6)
const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops();
if (v6_ops)
- return v6_ops->cookie_v6_check(iph, th, cookie);
+ return v6_ops->cookie_v6_check(iph, th);
#elif IS_BUILTIN(CONFIG_IPV6)
- return __cookie_v6_check(iph, th, cookie);
+ return __cookie_v6_check(iph, th);
#endif
#endif
return 0;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index d2f0736b76b8..2b2c79c7bbcd 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -491,8 +491,7 @@ void inet_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb);
struct sock *tcp_get_cookie_sock(struct sock *sk, struct sk_buff *skb,
struct request_sock *req,
struct dst_entry *dst, u32 tsoff);
-int __cookie_v4_check(const struct iphdr *iph, const struct tcphdr *th,
- u32 cookie);
+int __cookie_v4_check(const struct iphdr *iph, const struct tcphdr *th);
struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb);
struct request_sock *cookie_tcp_reqsk_alloc(const struct request_sock_ops *ops,
const struct tcp_request_sock_ops *af_ops,
@@ -586,8 +585,7 @@ bool cookie_ecn_ok(const struct tcp_options_received *opt,
const struct net *net, const struct dst_entry *dst);
/* From net/ipv6/syncookies.c */
-int __cookie_v6_check(const struct ipv6hdr *iph, const struct tcphdr *th,
- u32 cookie);
+int __cookie_v6_check(const struct ipv6hdr *iph, const struct tcphdr *th);
struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb);
u32 __cookie_v6_init_sequence(const struct ipv6hdr *iph,
diff --git a/net/core/filter.c b/net/core/filter.c
index 383f96b0a1c7..d64baa7ac6cd 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -7229,7 +7229,6 @@ BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len
struct tcphdr *, th, u32, th_len)
{
#ifdef CONFIG_SYN_COOKIES
- u32 cookie;
int ret;
if (unlikely(!sk || th_len < sizeof(*th)))
@@ -7251,8 +7250,6 @@ BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len
if (tcp_synq_no_recent_overflow(sk))
return -ENOENT;
- cookie = ntohl(th->ack_seq) - 1;
-
/* Both struct iphdr and struct ipv6hdr have the version field at the
* same offset so we can cast to the shorter header (struct iphdr).
*/
@@ -7261,7 +7258,7 @@ BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len
if (sk->sk_family == AF_INET6 && ipv6_only_sock(sk))
return -EINVAL;
- ret = __cookie_v4_check((struct iphdr *)iph, th, cookie);
+ ret = __cookie_v4_check((struct iphdr *)iph, th);
break;
#if IS_BUILTIN(CONFIG_IPV6)
@@ -7272,7 +7269,7 @@ BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len
if (sk->sk_family != AF_INET6)
return -EINVAL;
- ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie);
+ ret = __cookie_v6_check((struct ipv6hdr *)iph, th);
break;
#endif /* CONFIG_IPV6 */
@@ -7725,9 +7722,7 @@ static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv6_proto = {
BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv4, struct iphdr *, iph,
struct tcphdr *, th)
{
- u32 cookie = ntohl(th->ack_seq) - 1;
-
- if (__cookie_v4_check(iph, th, cookie) > 0)
+ if (__cookie_v4_check(iph, th) > 0)
return 0;
return -EACCES;
@@ -7748,9 +7743,7 @@ BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv6, struct ipv6hdr *, iph,
struct tcphdr *, th)
{
#if IS_BUILTIN(CONFIG_IPV6)
- u32 cookie = ntohl(th->ack_seq) - 1;
-
- if (__cookie_v6_check(iph, th, cookie) > 0)
+ if (__cookie_v6_check(iph, th) > 0)
return 0;
return -EACCES;
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 8b7d7d7788af..c08428d63d11 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -189,12 +189,14 @@ __u32 cookie_v4_init_sequence(const struct sk_buff *skb, __u16 *mssp)
* Check if a ack sequence number is a valid syncookie.
* Return the decoded mss if it is, or 0 if not.
*/
-int __cookie_v4_check(const struct iphdr *iph, const struct tcphdr *th,
- u32 cookie)
+int __cookie_v4_check(const struct iphdr *iph, const struct tcphdr *th)
{
+ __u32 cookie = ntohl(th->ack_seq) - 1;
__u32 seq = ntohl(th->seq) - 1;
- __u32 mssind = check_tcp_syn_cookie(cookie, iph->saddr, iph->daddr,
- th->source, th->dest, seq);
+ __u32 mssind;
+
+ mssind = check_tcp_syn_cookie(cookie, iph->saddr, iph->daddr,
+ th->source, th->dest, seq);
return mssind < ARRAY_SIZE(msstab) ? msstab[mssind] : 0;
}
@@ -332,7 +334,6 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
{
struct ip_options *opt = &TCP_SKB_CB(skb)->header.h4.opt;
const struct tcphdr *th = tcp_hdr(skb);
- __u32 cookie = ntohl(th->ack_seq) - 1;
struct tcp_options_received tcp_opt;
struct tcp_sock *tp = tcp_sk(sk);
struct inet_request_sock *ireq;
@@ -354,7 +355,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
if (tcp_synq_no_recent_overflow(sk))
goto out;
- mss = __cookie_v4_check(ip_hdr(skb), th, cookie);
+ mss = __cookie_v4_check(ip_hdr(skb), th);
if (mss == 0) {
__NET_INC_STATS(net, LINUX_MIB_SYNCOOKIESFAILED);
goto out;
@@ -384,7 +385,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
ireq = inet_rsk(req);
treq = tcp_rsk(req);
treq->rcv_isn = ntohl(th->seq) - 1;
- treq->snt_isn = cookie;
+ treq->snt_isn = ntohl(th->ack_seq) - 1;
treq->ts_off = 0;
treq->txhash = net_tx_rndhash();
req->mss = mss;
diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
index 106376cbc9de..4cd26c481168 100644
--- a/net/ipv6/syncookies.c
+++ b/net/ipv6/syncookies.c
@@ -114,12 +114,14 @@ __u32 cookie_v6_init_sequence(const struct sk_buff *skb, __u16 *mssp)
return __cookie_v6_init_sequence(iph, th, mssp);
}
-int __cookie_v6_check(const struct ipv6hdr *iph, const struct tcphdr *th,
- __u32 cookie)
+int __cookie_v6_check(const struct ipv6hdr *iph, const struct tcphdr *th)
{
+ __u32 cookie = ntohl(th->ack_seq) - 1;
__u32 seq = ntohl(th->seq) - 1;
- __u32 mssind = check_tcp_syn_cookie(cookie, &iph->saddr, &iph->daddr,
- th->source, th->dest, seq);
+ __u32 mssind;
+
+ mssind = check_tcp_syn_cookie(cookie, &iph->saddr, &iph->daddr,
+ th->source, th->dest, seq);
return mssind < ARRAY_SIZE(msstab) ? msstab[mssind] : 0;
}
@@ -128,7 +130,6 @@ EXPORT_SYMBOL_GPL(__cookie_v6_check);
struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
{
const struct tcphdr *th = tcp_hdr(skb);
- __u32 cookie = ntohl(th->ack_seq) - 1;
struct ipv6_pinfo *np = inet6_sk(sk);
struct tcp_options_received tcp_opt;
struct tcp_sock *tp = tcp_sk(sk);
@@ -150,7 +151,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
if (tcp_synq_no_recent_overflow(sk))
goto out;
- mss = __cookie_v6_check(ipv6_hdr(skb), th, cookie);
+ mss = __cookie_v6_check(ipv6_hdr(skb), th);
if (mss == 0) {
__NET_INC_STATS(net, LINUX_MIB_SYNCOOKIESFAILED);
goto out;
@@ -213,7 +214,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
req->ts_recent = tcp_opt.saw_tstamp ? tcp_opt.rcv_tsval : 0;
treq->snt_synack = 0;
treq->rcv_isn = ntohl(th->seq) - 1;
- treq->snt_isn = cookie;
+ treq->snt_isn = ntohl(th->ack_seq) - 1;
treq->ts_off = 0;
treq->txhash = net_tx_rndhash();
diff --git a/net/netfilter/nf_synproxy_core.c b/net/netfilter/nf_synproxy_core.c
index 467671f2d42f..fbbc4fd37349 100644
--- a/net/netfilter/nf_synproxy_core.c
+++ b/net/netfilter/nf_synproxy_core.c
@@ -617,7 +617,7 @@ synproxy_recv_client_ack(struct net *net,
struct synproxy_net *snet = synproxy_pernet(net);
int mss;
- mss = __cookie_v4_check(ip_hdr(skb), th, ntohl(th->ack_seq) - 1);
+ mss = __cookie_v4_check(ip_hdr(skb), th);
if (mss == 0) {
this_cpu_inc(snet->stats->cookie_invalid);
return false;
@@ -1034,7 +1034,7 @@ synproxy_recv_client_ack_ipv6(struct net *net,
struct synproxy_net *snet = synproxy_pernet(net);
int mss;
- mss = nf_cookie_v6_check(ipv6_hdr(skb), th, ntohl(th->ack_seq) - 1);
+ mss = nf_cookie_v6_check(ipv6_hdr(skb), th);
if (mss == 0) {
this_cpu_inc(snet->stats->cookie_invalid);
return false;
--
2.30.2
