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Message-ID: <20230810103927.1705940-7-edumazet@google.com>
Date: Thu, 10 Aug 2023 10:39:18 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <simon.horman@...igine.com>, Soheil Hassas Yeganeh <soheil@...gle.com>, netdev@...r.kernel.org,
eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 06/15] inet: move inet->hdrincl to inet->inet_flags
IP_HDRINCL socket option can now be set/read
without locking the socket.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
include/net/inet_sock.h | 4 ++--
net/ipv4/af_inet.c | 2 +-
net/ipv4/inet_diag.c | 2 +-
net/ipv4/ip_output.c | 5 +++--
net/ipv4/ip_sockglue.c | 18 ++++++++----------
net/ipv4/raw.c | 10 +++-------
net/ipv4/route.c | 8 ++++----
net/ipv6/af_inet6.c | 2 +-
net/ipv6/ip6_output.c | 5 +++--
net/ipv6/raw.c | 16 +++++-----------
10 files changed, 31 insertions(+), 41 deletions(-)
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index d6ba963534b4a5aa5dc6f88b94dd36f260be765b..ad1895e32e7d9bbad4ce210bda9698328e026b18 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -231,7 +231,6 @@ struct inet_sock {
__u8 mc_ttl;
__u8 pmtudisc;
__u8 is_icsk:1,
- hdrincl:1,
mc_loop:1,
transparent:1,
mc_all:1,
@@ -271,6 +270,7 @@ enum {
INET_FLAGS_RECVERR = 9,
INET_FLAGS_RECVERR_RFC4884 = 10,
INET_FLAGS_FREEBIND = 11,
+ INET_FLAGS_HDRINCL = 12,
};
/* cmsg flags for inet */
@@ -397,7 +397,7 @@ static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
{
__u8 flags = 0;
- if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
+ if (inet_sk(sk)->transparent || inet_test_bit(HDRINCL, sk))
flags |= FLOWI_FLAG_ANYSRC;
return flags;
}
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 9b2ca2fcc5a1176ffcaab4abee1492c6466ce5ca..a42ae7a6a7aa17cf15faf4a9674241bc38e59e42 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -332,7 +332,7 @@ static int inet_create(struct net *net, struct socket *sock, int protocol,
if (SOCK_RAW == sock->type) {
inet->inet_num = protocol;
if (IPPROTO_RAW == protocol)
- inet->hdrincl = 1;
+ inet_set_bit(HDRINCL, sk);
}
if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 5a96f4f28eca6ae6e84cb3761531309e8da0be09..98f3eb0ce16ab32daccf3c2407630622e9cdb71d 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -185,7 +185,7 @@ int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
inet_sockopt.recverr = inet_test_bit(RECVERR, sk);
inet_sockopt.is_icsk = inet->is_icsk;
inet_sockopt.freebind = inet_test_bit(FREEBIND, sk);
- inet_sockopt.hdrincl = inet->hdrincl;
+ inet_sockopt.hdrincl = inet_test_bit(HDRINCL, sk);
inet_sockopt.mc_loop = inet->mc_loop;
inet_sockopt.transparent = inet->transparent;
inet_sockopt.mc_all = inet->mc_all;
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index f28c87533a46567dca565a9cd47789cdefe9ac07..8f396eada1b6e61ab174473e9859bc62a10a0d1c 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1039,7 +1039,7 @@ static int __ip_append_data(struct sock *sk,
}
}
} else if ((flags & MSG_SPLICE_PAGES) && length) {
- if (inet->hdrincl)
+ if (inet_test_bit(HDRINCL, sk))
return -EPERM;
if (rt->dst.dev->features & NETIF_F_SG &&
getfrag == ip_generic_getfrag)
@@ -1467,7 +1467,8 @@ struct sk_buff *__ip_make_skb(struct sock *sk,
* so icmphdr does not in skb linear region and can not get icmp_type
* by icmp_hdr(skb)->type.
*/
- if (sk->sk_type == SOCK_RAW && !inet_sk(sk)->hdrincl)
+ if (sk->sk_type == SOCK_RAW &&
+ !inet_test_bit(HDRINCL, sk))
icmp_type = fl4->fl4_icmp_type;
else
icmp_type = icmp_hdr(skb)->type;
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 6af84310631288c07f26c19734c5abc0fd82dc23..763456fd4f4faac8e46d649a281f178be05a7cef 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -988,6 +988,11 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname,
return -EINVAL;
inet_assign_bit(FREEBIND, sk, val);
return 0;
+ case IP_HDRINCL:
+ if (sk->sk_type != SOCK_RAW)
+ return -ENOPROTOOPT;
+ inet_assign_bit(HDRINCL, sk, val);
+ return 0;
}
err = 0;
@@ -1052,13 +1057,6 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname,
goto e_inval;
inet->uc_ttl = val;
break;
- case IP_HDRINCL:
- if (sk->sk_type != SOCK_RAW) {
- err = -ENOPROTOOPT;
- break;
- }
- inet->hdrincl = val ? 1 : 0;
- break;
case IP_NODEFRAG:
if (sk->sk_type != SOCK_RAW) {
err = -ENOPROTOOPT;
@@ -1578,6 +1576,9 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname,
case IP_FREEBIND:
val = inet_test_bit(FREEBIND, sk);
goto copyval;
+ case IP_HDRINCL:
+ val = inet_test_bit(HDRINCL, sk);
+ goto copyval;
}
if (needs_rtnl)
@@ -1625,9 +1626,6 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname,
inet->uc_ttl);
break;
}
- case IP_HDRINCL:
- val = inet->hdrincl;
- break;
case IP_NODEFRAG:
val = inet->nodefrag;
break;
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index f4c27dc5714bd4be7bbd4a8e5b614c9426e6b987..4b5db5d1edc279df1fd7412af2845a7a79c95ec8 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -251,7 +251,7 @@ static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
const struct iphdr *iph = (const struct iphdr *)skb->data;
u8 *payload = skb->data + (iph->ihl << 2);
- if (inet->hdrincl)
+ if (inet_test_bit(HDRINCL, sk))
payload = skb->data;
ip_icmp_error(sk, skb, err, 0, info, payload);
}
@@ -491,12 +491,8 @@ static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if (len > 0xFFFF)
goto out;
- /* hdrincl should be READ_ONCE(inet->hdrincl)
- * but READ_ONCE() doesn't work with bit fields.
- * Doing this indirectly yields the same result.
- */
- hdrincl = inet->hdrincl;
- hdrincl = READ_ONCE(hdrincl);
+ hdrincl = inet_test_bit(HDRINCL, sk);
+
/*
* Check the flags.
*/
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 92fede388d52052ee3bd2337298b8cb0608dc362..a4e153dd615ba9321d8252a5026acafaa294a149 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -515,13 +515,12 @@ static void __build_flow_key(const struct net *net, struct flowi4 *fl4,
__u8 scope = RT_SCOPE_UNIVERSE;
if (sk) {
- const struct inet_sock *inet = inet_sk(sk);
-
oif = sk->sk_bound_dev_if;
mark = READ_ONCE(sk->sk_mark);
tos = ip_sock_rt_tos(sk);
scope = ip_sock_rt_scope(sk);
- prot = inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol;
+ prot = inet_test_bit(HDRINCL, sk) ? IPPROTO_RAW :
+ sk->sk_protocol;
}
flowi4_init_output(fl4, oif, mark, tos & IPTOS_RT_MASK, scope,
@@ -555,7 +554,8 @@ static void build_sk_flow_key(struct flowi4 *fl4, const struct sock *sk)
flowi4_init_output(fl4, sk->sk_bound_dev_if, READ_ONCE(sk->sk_mark),
ip_sock_rt_tos(sk) & IPTOS_RT_MASK,
ip_sock_rt_scope(sk),
- inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol,
+ inet_test_bit(HDRINCL, sk) ?
+ IPPROTO_RAW : sk->sk_protocol,
inet_sk_flowi_flags(sk),
daddr, inet->inet_saddr, 0, 0, sk->sk_uid);
rcu_read_unlock();
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 9f9c4b838664a76cb4d7efbeb16056e22f12b358..138270e59ea6e2f30fcd75440609f92306bd4975 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -205,7 +205,7 @@ static int inet6_create(struct net *net, struct socket *sock, int protocol,
if (SOCK_RAW == sock->type) {
inet->inet_num = protocol;
if (IPPROTO_RAW == protocol)
- inet->hdrincl = 1;
+ inet_set_bit(HDRINCL, sk);
}
sk->sk_destruct = inet6_sock_destruct;
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index bc96559bbf0f8d27e2afc05696a13da6b4c1f33c..f8a1f6bb3f87251836fe6a478f16ef948239ed93 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1591,7 +1591,7 @@ static int __ip6_append_data(struct sock *sk,
}
}
} else if ((flags & MSG_SPLICE_PAGES) && length) {
- if (inet_sk(sk)->hdrincl)
+ if (inet_test_bit(HDRINCL, sk))
return -EPERM;
if (rt->dst.dev->features & NETIF_F_SG &&
getfrag == ip_generic_getfrag)
@@ -1995,7 +1995,8 @@ struct sk_buff *__ip6_make_skb(struct sock *sk,
struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
u8 icmp6_type;
- if (sk->sk_socket->type == SOCK_RAW && !inet_sk(sk)->hdrincl)
+ if (sk->sk_socket->type == SOCK_RAW &&
+ !inet_test_bit(HDRINCL, sk))
icmp6_type = fl6->fl6_icmp_type;
else
icmp6_type = icmp6_hdr(skb)->icmp6_type;
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index ea16734f5e1f7f81d329c337efbd02ab466b7ec2..0eae7661a85c4487a64384c6054a3fb827387ce7 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -291,7 +291,6 @@ static void rawv6_err(struct sock *sk, struct sk_buff *skb,
struct inet6_skb_parm *opt,
u8 type, u8 code, int offset, __be32 info)
{
- struct inet_sock *inet = inet_sk(sk);
struct ipv6_pinfo *np = inet6_sk(sk);
int err;
int harderr;
@@ -315,7 +314,7 @@ static void rawv6_err(struct sock *sk, struct sk_buff *skb,
}
if (np->recverr) {
u8 *payload = skb->data;
- if (!inet->hdrincl)
+ if (!inet_test_bit(HDRINCL, sk))
payload += offset;
ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
}
@@ -406,7 +405,7 @@ int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
skb->len,
inet->inet_num, 0));
- if (inet->hdrincl) {
+ if (inet_test_bit(HDRINCL, sk)) {
if (skb_checksum_complete(skb)) {
atomic_inc(&sk->sk_drops);
kfree_skb_reason(skb, SKB_DROP_REASON_SKB_CSUM);
@@ -762,12 +761,7 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if (msg->msg_flags & MSG_OOB)
return -EOPNOTSUPP;
- /* hdrincl should be READ_ONCE(inet->hdrincl)
- * but READ_ONCE() doesn't work with bit fields.
- * Doing this indirectly yields the same result.
- */
- hdrincl = inet->hdrincl;
- hdrincl = READ_ONCE(hdrincl);
+ hdrincl = inet_test_bit(HDRINCL, sk);
/*
* Get and verify the address.
@@ -1000,7 +994,7 @@ static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
case IPV6_HDRINCL:
if (sk->sk_type != SOCK_RAW)
return -EINVAL;
- inet_sk(sk)->hdrincl = !!val;
+ inet_assign_bit(HDRINCL, sk, val);
return 0;
case IPV6_CHECKSUM:
if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
@@ -1068,7 +1062,7 @@ static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
switch (optname) {
case IPV6_HDRINCL:
- val = inet_sk(sk)->hdrincl;
+ val = inet_test_bit(HDRINCL, sk);
break;
case IPV6_CHECKSUM:
/*
--
2.41.0.640.ga95def55d0-goog
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