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Date: Thu, 3 Mar 2022 20:53:53 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, edumazet@...gle.com, dsahern@...il.com,
menglong8.dong@...il.com, Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next] skb: make drop reason booleanable
We have a number of cases where function returns drop/no drop
decision as a boolean. Now that we want to report the reason
code as well we have to pass extra output arguments.
We can make the reason code evaluate correctly as bool.
I believe we're good to reorder the reasons as they are
reported to user space as strings.
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
This patch implements what I suggested in review at some
point but which was not implemented. IDK if it wasn't
understood or the idea is bad?
---
include/linux/skbuff.h | 1 +
include/net/tcp.h | 21 +++++++++++----------
net/ipv4/tcp.c | 21 +++++++++------------
net/ipv4/tcp_ipv4.c | 12 +++++++-----
net/ipv6/tcp_ipv6.c | 11 +++++++----
5 files changed, 35 insertions(+), 31 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 5445860e1ba6..b8e0652c0fb0 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -314,6 +314,7 @@ struct sk_buff;
* used to translate the reason to string.
*/
enum skb_drop_reason {
+ SKB_OKAY = 0,
SKB_DROP_REASON_NOT_SPECIFIED, /* drop reason is not specified */
SKB_DROP_REASON_NO_SOCKET, /* socket not found */
SKB_DROP_REASON_PKT_TOO_SMALL, /* packet size is too small */
diff --git a/include/net/tcp.h b/include/net/tcp.h
index d486d7b6112d..467ed2dd32c9 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1674,10 +1674,11 @@ tcp_md5_do_lookup(const struct sock *sk, int l3index,
return NULL;
return __tcp_md5_do_lookup(sk, l3index, addr, family);
}
-bool tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
- enum skb_drop_reason *reason,
- const void *saddr, const void *daddr,
- int family, int dif, int sdif);
+
+enum skb_drop_reason
+tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
+ const void *saddr, const void *daddr,
+ int family, int dif, int sdif);
#define tcp_twsk_md5_key(twsk) ((twsk)->tw_md5_key)
@@ -1688,13 +1689,13 @@ tcp_md5_do_lookup(const struct sock *sk, int l3index,
{
return NULL;
}
-static inline bool tcp_inbound_md5_hash(const struct sock *sk,
- const struct sk_buff *skb,
- enum skb_drop_reason *reason,
- const void *saddr, const void *daddr,
- int family, int dif, int sdif)
+
+static inline enum skb_drop_reason
+tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
+ const void *saddr, const void *daddr,
+ int family, int dif, int sdif);
{
- return false;
+ return __SKB_OKAY;
}
#define tcp_twsk_md5_key(twsk) NULL
#endif
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 68f1236b2858..33e9e1e4d041 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -4432,10 +4432,10 @@ int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, const struct tcp_md5sig_key *ke
EXPORT_SYMBOL(tcp_md5_hash_key);
/* Called with rcu_read_lock() */
-bool tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
- enum skb_drop_reason *reason,
- const void *saddr, const void *daddr,
- int family, int dif, int sdif)
+enum skb_drop_reason
+tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
+ const void *saddr, const void *daddr,
+ int family, int dif, int sdif)
{
/*
* This gets called for each TCP segment that arrives
@@ -4462,18 +4462,16 @@ bool tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
/* We've parsed the options - do we have a hash? */
if (!hash_expected && !hash_location)
- return false;
+ return SKB_OKAY;
if (hash_expected && !hash_location) {
- *reason = SKB_DROP_REASON_TCP_MD5NOTFOUND;
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
- return true;
+ return SKB_DROP_REASON_TCP_MD5NOTFOUND;
}
if (!hash_expected && hash_location) {
- *reason = SKB_DROP_REASON_TCP_MD5UNEXPECTED;
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
- return true;
+ return SKB_DROP_REASON_TCP_MD5UNEXPECTED;
}
/* check the signature */
@@ -4481,7 +4479,6 @@ bool tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
NULL, skb);
if (genhash || memcmp(hash_location, newhash, 16) != 0) {
- *reason = SKB_DROP_REASON_TCP_MD5FAILURE;
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE);
if (family == AF_INET) {
net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s L3 index %d\n",
@@ -4495,9 +4492,9 @@ bool tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
saddr, ntohs(th->source),
daddr, ntohs(th->dest), l3index);
}
- return true;
+ return SKB_DROP_REASON_TCP_MD5FAILURE;
}
- return false;
+ return SKB_OKAY;
}
EXPORT_SYMBOL(tcp_inbound_md5_hash);
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 411357ad9757..81694a354110 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1965,9 +1965,10 @@ int tcp_v4_rcv(struct sk_buff *skb)
struct sock *nsk;
sk = req->rsk_listener;
- if (unlikely(tcp_inbound_md5_hash(sk, skb, &drop_reason,
- &iph->saddr, &iph->daddr,
- AF_INET, dif, sdif))) {
+ drop_reason = tcp_inbound_md5_hash(sk, skb,
+ &iph->saddr, &iph->daddr,
+ AF_INET, dif, sdif);
+ if (unlikely(drop_reason)) {
sk_drops_add(sk, skb);
reqsk_put(req);
goto discard_it;
@@ -2041,8 +2042,9 @@ int tcp_v4_rcv(struct sk_buff *skb)
goto discard_and_relse;
}
- if (tcp_inbound_md5_hash(sk, skb, &drop_reason, &iph->saddr,
- &iph->daddr, AF_INET, dif, sdif))
+ drop_reason = tcp_inbound_md5_hash(sk, skb, &iph->saddr,
+ &iph->daddr, AF_INET, dif, sdif);
+ if (drop_reason)
goto discard_and_relse;
nf_reset_ct(skb);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index cb2bb7d2e907..13678d3908fa 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1632,8 +1632,10 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb)
struct sock *nsk;
sk = req->rsk_listener;
- if (tcp_inbound_md5_hash(sk, skb, &drop_reason, &hdr->saddr,
- &hdr->daddr, AF_INET6, dif, sdif)) {
+ drop_reason = tcp_inbound_md5_hash(sk, skb,
+ &hdr->saddr, &hdr->daddr,
+ AF_INET6, dif, sdif);
+ if (drop_reason) {
sk_drops_add(sk, skb);
reqsk_put(req);
goto discard_it;
@@ -1704,8 +1706,9 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb)
goto discard_and_relse;
}
- if (tcp_inbound_md5_hash(sk, skb, &drop_reason, &hdr->saddr,
- &hdr->daddr, AF_INET6, dif, sdif))
+ drop_reason = tcp_inbound_md5_hash(sk, skb, &hdr->saddr, &hdr->daddr,
+ AF_INET6, dif, sdif);
+ if (drop_reason)
goto discard_and_relse;
if (tcp_filter(sk, skb)) {
--
2.34.1
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