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tcp: Cache sock_net(sk) in cookie_v[46]_check().

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sock_net(sk) is used repeatedly in cookie_v[46]_check().
Let's cache it in a variable.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20231129022924.96156-3-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kuniyuki Iwashima 2023-11-28 18:29:18 -08:00 committed by Jakub Kicinski
parent 34efc9cfe7
commit 45c28509fe
2 changed files with 21 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
net/ipv4/syncookies.c
View File

@ -336,6 +336,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
struct tcp_options_received tcp_opt;
struct tcp_sock *tp = tcp_sk(sk);
struct inet_request_sock *ireq;
struct net *net = sock_net(sk);
struct tcp_request_sock *treq;
struct request_sock *req;
struct sock *ret = sk;
@ -346,7 +347,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
u32 tsoff = 0;
int l3index;
if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies) ||
if (!READ_ONCE(net->ipv4.sysctl_tcp_syncookies) ||
!th->ack || th->rst)
goto out;
@ -355,24 +356,24 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
mss = __cookie_v4_check(ip_hdr(skb), th, cookie);
if (mss == 0) {
__NET_INC_STATS(sock_net(sk), LINUX_MIB_SYNCOOKIESFAILED);
__NET_INC_STATS(net, LINUX_MIB_SYNCOOKIESFAILED);
goto out;
}
__NET_INC_STATS(sock_net(sk), LINUX_MIB_SYNCOOKIESRECV);
__NET_INC_STATS(net, LINUX_MIB_SYNCOOKIESRECV);
/* check for timestamp cookie support */
memset(&tcp_opt, 0, sizeof(tcp_opt));
tcp_parse_options(sock_net(sk), skb, &tcp_opt, 0, NULL);
tcp_parse_options(net, skb, &tcp_opt, 0, NULL);
if (tcp_opt.saw_tstamp && tcp_opt.rcv_tsecr) {
tsoff = secure_tcp_ts_off(sock_net(sk),
tsoff = secure_tcp_ts_off(net,
ip_hdr(skb)->daddr,
ip_hdr(skb)->saddr);
tcp_opt.rcv_tsecr -= tsoff;
}
if (!cookie_timestamp_decode(sock_net(sk), &tcp_opt))
if (!cookie_timestamp_decode(net, &tcp_opt))
goto out;
ret = NULL;
@ -406,13 +407,13 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
ireq->ir_iif = inet_request_bound_dev_if(sk, skb);
l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif);
l3index = l3mdev_master_ifindex_by_index(net, ireq->ir_iif);
tcp_ao_syncookie(sk, skb, treq, AF_INET, l3index);
/* 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)
*/
RCU_INIT_POINTER(ireq->ireq_opt, tcp_v4_save_options(sock_net(sk), skb));
RCU_INIT_POINTER(ireq->ireq_opt, tcp_v4_save_options(net, skb));
if (security_inet_conn_request(sk, skb, req)) {
reqsk_free(req);
@ -433,7 +434,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
opt->srr ? opt->faddr : ireq->ir_rmt_addr,
ireq->ir_loc_addr, th->source, th->dest, sk->sk_uid);
security_req_classify_flow(req, flowi4_to_flowi_common(&fl4));
rt = ip_route_output_key(sock_net(sk), &fl4);
rt = ip_route_output_key(net, &fl4);
if (IS_ERR(rt)) {
reqsk_free(req);
goto out;
@ -453,7 +454,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
dst_metric(&rt->dst, RTAX_INITRWND));
ireq->rcv_wscale = rcv_wscale;
ireq->ecn_ok = cookie_ecn_ok(&tcp_opt, sock_net(sk), &rt->dst);
ireq->ecn_ok = cookie_ecn_ok(&tcp_opt, net, &rt->dst);
ret = tcp_get_cookie_sock(sk, skb, req, &rt->dst, tsoff);
/* ip_queue_xmit() depends on our flow being setup

19
net/ipv6/syncookies.c
View File

@ -133,6 +133,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
struct tcp_options_received tcp_opt;
struct tcp_sock *tp = tcp_sk(sk);
struct inet_request_sock *ireq;
struct net *net = sock_net(sk);
struct tcp_request_sock *treq;
struct request_sock *req;
struct dst_entry *dst;
@ -142,7 +143,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
u32 tsoff = 0;
int l3index;
if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies) ||
if (!READ_ONCE(net->ipv4.sysctl_tcp_syncookies) ||
!th->ack || th->rst)
goto out;
@ -151,24 +152,24 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
mss = __cookie_v6_check(ipv6_hdr(skb), th, cookie);
if (mss == 0) {
__NET_INC_STATS(sock_net(sk), LINUX_MIB_SYNCOOKIESFAILED);
__NET_INC_STATS(net, LINUX_MIB_SYNCOOKIESFAILED);
goto out;
}
__NET_INC_STATS(sock_net(sk), LINUX_MIB_SYNCOOKIESRECV);
__NET_INC_STATS(net, LINUX_MIB_SYNCOOKIESRECV);
/* check for timestamp cookie support */
memset(&tcp_opt, 0, sizeof(tcp_opt));
tcp_parse_options(sock_net(sk), skb, &tcp_opt, 0, NULL);
tcp_parse_options(net, skb, &tcp_opt, 0, NULL);
if (tcp_opt.saw_tstamp && tcp_opt.rcv_tsecr) {
tsoff = secure_tcpv6_ts_off(sock_net(sk),
tsoff = secure_tcpv6_ts_off(net,
ipv6_hdr(skb)->daddr.s6_addr32,
ipv6_hdr(skb)->saddr.s6_addr32);
tcp_opt.rcv_tsecr -= tsoff;
}
if (!cookie_timestamp_decode(sock_net(sk), &tcp_opt))
if (!cookie_timestamp_decode(net, &tcp_opt))
goto out;
ret = NULL;
@ -217,7 +218,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
treq->ts_off = 0;
treq->txhash = net_tx_rndhash();
l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif);
l3index = l3mdev_master_ifindex_by_index(net, ireq->ir_iif);
tcp_ao_syncookie(sk, skb, treq, AF_INET6, l3index);
if (IS_ENABLED(CONFIG_SMC))
@ -243,7 +244,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
fl6.flowi6_uid = sk->sk_uid;
security_req_classify_flow(req, flowi6_to_flowi_common(&fl6));
dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
dst = ip6_dst_lookup_flow(net, sk, &fl6, final_p);
if (IS_ERR(dst))
goto out_free;
}
@ -261,7 +262,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
dst_metric(dst, RTAX_INITRWND));
ireq->rcv_wscale = rcv_wscale;
ireq->ecn_ok = cookie_ecn_ok(&tcp_opt, sock_net(sk), dst);
ireq->ecn_ok = cookie_ecn_ok(&tcp_opt, net, dst);
ret = tcp_get_cookie_sock(sk, skb, req, dst, tsoff);
out: