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netfilter: conntrack: remove pr_debug callsites from tcp tracker 

They are either obsolete or useless.

Those in the normal processing path cannot be enabled on a production
system; they generate too much noise.

One pr_debug call resides in an error path and does provide useful info,
merge it with the existing nf_log_invalid().

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2022-05-12 17:08:47 +02:00 committed by Pablo Neira Ayuso
parent d265929930
commit f74360d344
1 changed files with 4 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
net/netfilter/nf_conntrack_proto_tcp.c
View File

@ -485,7 +485,6 @@ static bool tcp_in_window(struct nf_conn *ct,
struct nf_tcp_net *tn = nf_tcp_pernet(net);
struct ip_ct_tcp_state *sender = &state->seen[dir];
struct ip_ct_tcp_state *receiver = &state->seen[!dir];
const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
__u32 seq, ack, sack, end, win, swin;
u16 win_raw;
s32 receiver_offset;
@ -508,18 +507,6 @@ static bool tcp_in_window(struct nf_conn *ct,
ack -= receiver_offset;
sack -= receiver_offset;
pr_debug("tcp_in_window: START\n");
pr_debug("tcp_in_window: ");
nf_ct_dump_tuple(tuple);
pr_debug("seq=%u ack=%u+(%d) sack=%u+(%d) win=%u end=%u\n",
seq, ack, receiver_offset, sack, receiver_offset, win, end);
pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i "
"receiver end=%u maxend=%u maxwin=%u scale=%i\n",
sender->td_end, sender->td_maxend, sender->td_maxwin,
sender->td_scale,
receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
receiver->td_scale);
if (sender->td_maxwin == 0) {
/*
* Initialize sender data.
@ -597,27 +584,10 @@ static bool tcp_in_window(struct nf_conn *ct,
*/
seq = end = sender->td_end;
pr_debug("tcp_in_window: ");
nf_ct_dump_tuple(tuple);
pr_debug("seq=%u ack=%u+(%d) sack=%u+(%d) win=%u end=%u\n",
seq, ack, receiver_offset, sack, receiver_offset, win, end);
pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i "
"receiver end=%u maxend=%u maxwin=%u scale=%i\n",
sender->td_end, sender->td_maxend, sender->td_maxwin,
sender->td_scale,
receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
receiver->td_scale);
/* Is the ending sequence in the receive window (if available)? */
in_recv_win = !receiver->td_maxwin ||
after(end, sender->td_end - receiver->td_maxwin - 1);
pr_debug("tcp_in_window: I=%i II=%i III=%i IV=%i\n",
before(seq, sender->td_maxend + 1),
(in_recv_win ? 1 : 0),
before(sack, receiver->td_end + 1),
after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1));
if (before(seq, sender->td_maxend + 1) &&
in_recv_win &&
before(sack, receiver->td_end + 1) &&
@ -698,11 +668,6 @@ static bool tcp_in_window(struct nf_conn *ct,
}
}
pr_debug("tcp_in_window: res=%u sender end=%u maxend=%u maxwin=%u "
"receiver end=%u maxend=%u maxwin=%u\n",
res, sender->td_end, sender->td_maxend, sender->td_maxwin,
receiver->td_end, receiver->td_maxend, receiver->td_maxwin);
return res;
}
@ -772,8 +737,6 @@ static noinline bool tcp_new(struct nf_conn *ct, const struct sk_buff *skb,
enum tcp_conntrack new_state;
struct net *net = nf_ct_net(ct);
const struct nf_tcp_net *tn = nf_tcp_pernet(net);
const struct ip_ct_tcp_state *sender = &ct->proto.tcp.seen[0];
const struct ip_ct_tcp_state *receiver = &ct->proto.tcp.seen[1];
/* Don't need lock here: this conntrack not in circulation yet */
new_state = tcp_conntracks[0][get_conntrack_index(th)][TCP_CONNTRACK_NONE];
@ -826,14 +789,6 @@ static noinline bool tcp_new(struct nf_conn *ct, const struct sk_buff *skb,
/* tcp_packet will set them */
ct->proto.tcp.last_index = TCP_NONE_SET;
pr_debug("%s: sender end=%u maxend=%u maxwin=%u scale=%i "
"receiver end=%u maxend=%u maxwin=%u scale=%i\n",
__func__,
sender->td_end, sender->td_maxend, sender->td_maxwin,
sender->td_scale,
receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
receiver->td_scale);
return true;
}
@ -1032,10 +987,11 @@ int nf_conntrack_tcp_packet(struct nf_conn *ct,
}
/* Invalid packet */
pr_debug("nf_ct_tcp: Invalid dir=%i index=%u ostate=%u\n",
dir, get_conntrack_index(th), old_state);
spin_unlock_bh(&ct->lock);
nf_ct_l4proto_log_invalid(skb, ct, state, "invalid state");
nf_ct_l4proto_log_invalid(skb, ct, state,
"packet (index %d) in dir %d invalid, state %s",
index, dir,
tcp_conntrack_names[old_state]);
return -NF_ACCEPT;
case TCP_CONNTRACK_TIME_WAIT:
/* RFC5961 compliance cause stack to send "challenge-ACK"