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net: ipv4: use consistent txhash in TIME_WAIT and SYN_RECV

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When using IPv4/TCP, skb->hash comes from sk->sk_txhash except in
TIME_WAIT and SYN_RECV where it's not set in the reply skb from
ip_send_unicast_reply. Those packets will have a mismatched hash with
others from the same flow as their hashes will be 0. IPv6 does not have
the same issue as the hash is set from the socket txhash in those cases.

This commits sets the hash in the reply skb from ip_send_unicast_reply,
which makes the IPv4 code behaving like IPv6.

Signed-off-by: Antoine Tenart <atenart@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Antoine Tenart 2023-05-23 18:14:52 +02:00 committed by Paolo Abeni
parent 4fbfde4e27
commit c0a8966e2b
3 changed files with 13 additions and 7 deletions
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2
include/net/ip.h
View file

@ -286,7 +286,7 @@ void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
const struct ip_options *sopt,
__be32 daddr, __be32 saddr,
const struct ip_reply_arg *arg,
unsigned int len, u64 transmit_time);
unsigned int len, u64 transmit_time, u32 txhash);
#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
#define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field)

4
net/ipv4/ip_output.c
View file

@ -1570,7 +1570,7 @@ void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
const struct ip_options *sopt,
__be32 daddr, __be32 saddr,
const struct ip_reply_arg *arg,
unsigned int len, u64 transmit_time)
unsigned int len, u64 transmit_time, u32 txhash)
{
struct ip_options_data replyopts;
struct ipcm_cookie ipc;
@ -1633,6 +1633,8 @@ void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
arg->csum));
nskb->ip_summed = CHECKSUM_NONE;
nskb->mono_delivery_time = !!transmit_time;
if (txhash)
skb_set_hash(nskb, txhash, PKT_HASH_TYPE_L4);
ip_push_pending_frames(sk, &fl4);
}
out:

14
net/ipv4/tcp_ipv4.c
View file

@ -692,6 +692,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
u64 transmit_time = 0;
struct sock *ctl_sk;
struct net *net;
u32 txhash = 0;
/* Never send a reset in response to a reset. */
if (th->rst)
@ -829,6 +830,8 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
inet_twsk(sk)->tw_priority : sk->sk_priority;
transmit_time = tcp_transmit_time(sk);
xfrm_sk_clone_policy(ctl_sk, sk);
txhash = (sk->sk_state == TCP_TIME_WAIT) ?
inet_twsk(sk)->tw_txhash : sk->sk_txhash;
} else {
ctl_sk->sk_mark = 0;
ctl_sk->sk_priority = 0;
@ -837,7 +840,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
skb, &TCP_SKB_CB(skb)->header.h4.opt,
ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
&arg, arg.iov[0].iov_len,
transmit_time);
transmit_time, txhash);
xfrm_sk_free_policy(ctl_sk);
sock_net_set(ctl_sk, &init_net);
@ -859,7 +862,7 @@ static void tcp_v4_send_ack(const struct sock *sk,
struct sk_buff *skb, u32 seq, u32 ack,
u32 win, u32 tsval, u32 tsecr, int oif,
struct tcp_md5sig_key *key,
int reply_flags, u8 tos)
int reply_flags, u8 tos, u32 txhash)
{
const struct tcphdr *th = tcp_hdr(skb);
struct {
@ -935,7 +938,7 @@ static void tcp_v4_send_ack(const struct sock *sk,
skb, &TCP_SKB_CB(skb)->header.h4.opt,
ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
&arg, arg.iov[0].iov_len,
transmit_time);
transmit_time, txhash);
sock_net_set(ctl_sk, &init_net);
__TCP_INC_STATS(net, TCP_MIB_OUTSEGS);
@ -955,7 +958,8 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
tw->tw_bound_dev_if,
tcp_twsk_md5_key(tcptw),
tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0,
tw->tw_tos
tw->tw_tos,
tw->tw_txhash
);
inet_twsk_put(tw);
@ -988,7 +992,7 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
0,
tcp_md5_do_lookup(sk, l3index, addr, AF_INET),
inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0,
ip_hdr(skb)->tos);
ip_hdr(skb)->tos, tcp_rsk(req)->txhash);
}
/*