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Date: Fri, 10 Jun 2022 11:42:03 +0800
From: menglong8.dong@...il.com
To: edumazet@...gle.com
Cc: rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net,
yoshfuji@...ux-ipv6.org, dsahern@...nel.org, kuba@...nel.org,
pabeni@...hat.com, imagedong@...cent.com, kafai@...com,
talalahmad@...gle.com, keescook@...omium.org,
dongli.zhang@...cle.com, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, Jiang Biao <benbjiang@...cent.com>,
Hao Peng <flyingpeng@...cent.com>
Subject: [PATCH net-next v3 8/9] net: tcp: add skb drop reasons to route_req()
From: Menglong Dong <imagedong@...cent.com>
Add skb drop reasons to the route_req() in struct tcp_request_sock_ops.
Following functions are involved:
tcp_v4_route_req()
tcp_v6_route_req()
subflow_v4_route_req()
subflow_v6_route_req()
And the new reason SKB_DROP_REASON_LSM is added, which is used when
skb is dropped by LSM.
Reviewed-by: Jiang Biao <benbjiang@...cent.com>
Reviewed-by: Hao Peng <flyingpeng@...cent.com>
Signed-off-by: Menglong Dong <imagedong@...cent.com>
---
include/net/dropreason.h | 2 ++
include/net/tcp.h | 3 ++-
net/ipv4/tcp_input.c | 2 +-
net/ipv4/tcp_ipv4.c | 14 +++++++++++---
net/ipv6/tcp_ipv6.c | 14 +++++++++++---
net/mptcp/subflow.c | 10 ++++++----
6 files changed, 33 insertions(+), 12 deletions(-)
diff --git a/include/net/dropreason.h b/include/net/dropreason.h
index 3c6f8e0f7f16..22e9299e4bfe 100644
--- a/include/net/dropreason.h
+++ b/include/net/dropreason.h
@@ -264,6 +264,8 @@ enum skb_drop_reason {
* 'SYN' packet
*/
SKB_DROP_REASON_TIMEWAIT,
+ /** @SKB_DROP_REASON_LSM: dropped by LSM */
+ SKB_DROP_REASON_LSM,
/**
* @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be
* used as a real 'reason'
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 88217b8d95ac..ed57c331fdeb 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2075,7 +2075,8 @@ struct tcp_request_sock_ops {
struct dst_entry *(*route_req)(const struct sock *sk,
struct sk_buff *skb,
struct flowi *fl,
- struct request_sock *req);
+ struct request_sock *req,
+ enum skb_drop_reason *reason);
u32 (*init_seq)(const struct sk_buff *skb);
u32 (*init_ts_off)(const struct net *net, const struct sk_buff *skb);
int (*send_synack)(const struct sock *sk, struct dst_entry *dst,
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 6f7dd2564b9b..9b9247b34a6c 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6957,7 +6957,7 @@ enum skb_drop_reason tcp_conn_request(struct request_sock_ops *rsk_ops,
/* Note: tcp_v6_init_req() might override ir_iif for link locals */
inet_rsk(req)->ir_iif = inet_request_bound_dev_if(sk, skb);
- dst = af_ops->route_req(sk, skb, &fl, req);
+ dst = af_ops->route_req(sk, skb, &fl, req, &reason);
if (!dst)
goto drop_and_free;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index e7bd2f410a4a..dcaf2bac4f55 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1423,14 +1423,22 @@ static void tcp_v4_init_req(struct request_sock *req,
static struct dst_entry *tcp_v4_route_req(const struct sock *sk,
struct sk_buff *skb,
struct flowi *fl,
- struct request_sock *req)
+ struct request_sock *req,
+ enum skb_drop_reason *reason)
{
+ struct dst_entry *dst;
+
tcp_v4_init_req(req, sk, skb);
- if (security_inet_conn_request(sk, skb, req))
+ if (security_inet_conn_request(sk, skb, req)) {
+ SKB_DR_SET(*reason, LSM);
return NULL;
+ }
- return inet_csk_route_req(sk, &fl->u.ip4, req);
+ dst = inet_csk_route_req(sk, &fl->u.ip4, req);
+ if (!dst)
+ SKB_DR_SET(*reason, IP_OUTNOROUTES);
+ return dst;
}
struct request_sock_ops tcp_request_sock_ops __read_mostly = {
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 41551a3b679b..6e2d67238e11 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -802,14 +802,22 @@ static void tcp_v6_init_req(struct request_sock *req,
static struct dst_entry *tcp_v6_route_req(const struct sock *sk,
struct sk_buff *skb,
struct flowi *fl,
- struct request_sock *req)
+ struct request_sock *req,
+ enum skb_drop_reason *reason)
{
+ struct dst_entry *dst;
+
tcp_v6_init_req(req, sk, skb);
- if (security_inet_conn_request(sk, skb, req))
+ if (security_inet_conn_request(sk, skb, req)) {
+ SKB_DR_SET(*reason, LSM);
return NULL;
+ }
- return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP);
+ dst = inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP);
+ if (!dst)
+ SKB_DR_SET(*reason, IP_OUTNOROUTES);
+ return dst;
}
struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 5a1d05c3a1ef..654cc602ff2c 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -285,7 +285,8 @@ EXPORT_SYMBOL_GPL(mptcp_subflow_init_cookie_req);
static struct dst_entry *subflow_v4_route_req(const struct sock *sk,
struct sk_buff *skb,
struct flowi *fl,
- struct request_sock *req)
+ struct request_sock *req,
+ enum skb_drop_reason *reason)
{
struct dst_entry *dst;
int err;
@@ -293,7 +294,7 @@ static struct dst_entry *subflow_v4_route_req(const struct sock *sk,
tcp_rsk(req)->is_mptcp = 1;
subflow_init_req(req, sk);
- dst = tcp_request_sock_ipv4_ops.route_req(sk, skb, fl, req);
+ dst = tcp_request_sock_ipv4_ops.route_req(sk, skb, fl, req, reason);
if (!dst)
return NULL;
@@ -311,7 +312,8 @@ static struct dst_entry *subflow_v4_route_req(const struct sock *sk,
static struct dst_entry *subflow_v6_route_req(const struct sock *sk,
struct sk_buff *skb,
struct flowi *fl,
- struct request_sock *req)
+ struct request_sock *req,
+ enum skb_drop_reason *reason)
{
struct dst_entry *dst;
int err;
@@ -319,7 +321,7 @@ static struct dst_entry *subflow_v6_route_req(const struct sock *sk,
tcp_rsk(req)->is_mptcp = 1;
subflow_init_req(req, sk);
- dst = tcp_request_sock_ipv6_ops.route_req(sk, skb, fl, req);
+ dst = tcp_request_sock_ipv6_ops.route_req(sk, skb, fl, req, reason);
if (!dst)
return NULL;
--
2.36.1
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