inet_diag: return classid for all socket types

In commit fd99f91bcd57 ("inet_diag: fix reporting cgroup classid and
fallback to priority") croup classid reporting was fixed. But this works
only for TCP sockets because for other socket types icsk parameter can
be NULL and classid code path is skipped. This change moves classid
handling to inet_diag_msg_attrs_fill() function.

Also inet_diag_msg_attrs_size() helper was added and addends in
nlmsg_new() were reordered to save order from inet_sk_diag_fill().

Fixes: fd99f91bcd57 ("inet_diag: fix reporting cgroup classid and fallback to priority")
Signed-off-by: Dmitry Yakunin <zeil@yandex-team.ru>
Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/inet_diag.h b/include/linux/inet_diag.h
index 39faaaf843e1efb864ad148c710ed9cec7a82381..c91cf2dee12abd9fe4225c7000dcc2c25fbef0ed 100644 (file)
--- a/include/linux/inet_diag.h
+++ b/include/linux/inet_diag.h
@@ -2,15 +2,10 @@
 #ifndef _INET_DIAG_H_
 #define _INET_DIAG_H_ 1
 
+#include <net/netlink.h>
 #include <uapi/linux/inet_diag.h>
 
-struct net;
-struct sock;
 struct inet_hashinfo;
-struct nlattr;
-struct nlmsghdr;
-struct sk_buff;
-struct netlink_callback;
 
 struct inet_diag_handler {
        void            (*dump)(struct sk_buff *skb,
@@ -62,6 +57,17 @@ int inet_diag_bc_sk(const struct nlattr *_bc, struct sock *sk);
 
 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk);
 
+static inline size_t inet_diag_msg_attrs_size(void)
+{
+       return    nla_total_size(1)  /* INET_DIAG_SHUTDOWN */
+               + nla_total_size(1)  /* INET_DIAG_TOS */
+#if IS_ENABLED(CONFIG_IPV6)
+               + nla_total_size(1)  /* INET_DIAG_TCLASS */
+               + nla_total_size(1)  /* INET_DIAG_SKV6ONLY */
+#endif
+               + nla_total_size(4)  /* INET_DIAG_MARK */
+               + nla_total_size(4); /* INET_DIAG_CLASS_ID */
+}
 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
                             struct inet_diag_msg *r, int ext,
                             struct user_namespace *user_ns, bool net_admin);

diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index f11e997e517b6652479acd892ffea6cdeb940e33..8c8377568a787c80540aac7e9ed6f122068010ca 100644 (file)
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -100,13 +100,9 @@ static size_t inet_sk_attr_size(struct sock *sk,
                aux = handler->idiag_get_aux_size(sk, net_admin);
 
        return    nla_total_size(sizeof(struct tcp_info))
-               + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
-               + nla_total_size(1) /* INET_DIAG_TOS */
-               + nla_total_size(1) /* INET_DIAG_TCLASS */
-               + nla_total_size(4) /* INET_DIAG_MARK */
-               + nla_total_size(4) /* INET_DIAG_CLASS_ID */
-               + nla_total_size(sizeof(struct inet_diag_meminfo))
                + nla_total_size(sizeof(struct inet_diag_msg))
+               + inet_diag_msg_attrs_size()
+               + nla_total_size(sizeof(struct inet_diag_meminfo))
                + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
                + nla_total_size(TCP_CA_NAME_MAX)
                + nla_total_size(sizeof(struct tcpvegas_info))
@@ -147,6 +143,24 @@ int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
        if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
                goto errout;
 
+       if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
+           ext & (1 << (INET_DIAG_TCLASS - 1))) {
+               u32 classid = 0;
+
+#ifdef CONFIG_SOCK_CGROUP_DATA
+               classid = sock_cgroup_classid(&sk->sk_cgrp_data);
+#endif
+               /* Fallback to socket priority if class id isn't set.
+                * Classful qdiscs use it as direct reference to class.
+                * For cgroup2 classid is always zero.
+                */
+               if (!classid)
+                       classid = sk->sk_priority;
+
+               if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
+                       goto errout;
+       }
+
        r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
        r->idiag_inode = sock_i_ino(sk);
 
@@ -284,24 +298,6 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
                        goto errout;
        }
 
-       if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
-           ext & (1 << (INET_DIAG_TCLASS - 1))) {
-               u32 classid = 0;
-
-#ifdef CONFIG_SOCK_CGROUP_DATA
-               classid = sock_cgroup_classid(&sk->sk_cgrp_data);
-#endif
-               /* Fallback to socket priority if class id isn't set.
-                * Classful qdiscs use it as direct reference to class.
-                * For cgroup2 classid is always zero.
-                */
-               if (!classid)
-                       classid = sk->sk_priority;
-
-               if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
-                       goto errout;
-       }
-
 out:
        nlmsg_end(skb, nlh);
        return 0;

diff --git a/net/ipv4/raw_diag.c b/net/ipv4/raw_diag.c
index e35736b993003253614de79a6c83e4fd1a0a0a73..a93e7d1e125154e7afa0a7f162429a233de64a95 100644 (file)
--- a/net/ipv4/raw_diag.c
+++ b/net/ipv4/raw_diag.c
@@ -100,8 +100,9 @@ static int raw_diag_dump_one(struct sk_buff *in_skb,
        if (IS_ERR(sk))
                return PTR_ERR(sk);
 
-       rep = nlmsg_new(sizeof(struct inet_diag_msg) +
-                       sizeof(struct inet_diag_meminfo) + 64,
+       rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) +
+                       inet_diag_msg_attrs_size() +
+                       nla_total_size(sizeof(struct inet_diag_meminfo)) + 64,
                        GFP_KERNEL);
        if (!rep) {
                sock_put(sk);

diff --git a/net/ipv4/udp_diag.c b/net/ipv4/udp_diag.c
index 910555a4d9fe2dcc1465421afac904d20147dd06..dccd2286bc2849458417956f7340ab5e06105e49 100644 (file)
--- a/net/ipv4/udp_diag.c
+++ b/net/ipv4/udp_diag.c
@@ -64,8 +64,9 @@ static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
                goto out;
 
        err = -ENOMEM;
-       rep = nlmsg_new(sizeof(struct inet_diag_msg) +
-                       sizeof(struct inet_diag_meminfo) + 64,
+       rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) +
+                       inet_diag_msg_attrs_size() +
+                       nla_total_size(sizeof(struct inet_diag_meminfo)) + 64,
                        GFP_KERNEL);
        if (!rep)
                goto out;

diff --git a/net/sctp/diag.c b/net/sctp/diag.c
index 8a15146faaebdcb869233a08318e4fb5a1e1129b..1069d7af367290a42df7a52b2b0a3638c5b55f21 100644 (file)
--- a/net/sctp/diag.c
+++ b/net/sctp/diag.c
@@ -237,15 +237,11 @@ static size_t inet_assoc_attr_size(struct sctp_association *asoc)
                addrcnt++;
 
        return    nla_total_size(sizeof(struct sctp_info))
-               + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
-               + nla_total_size(1) /* INET_DIAG_TOS */
-               + nla_total_size(1) /* INET_DIAG_TCLASS */
-               + nla_total_size(4) /* INET_DIAG_MARK */
-               + nla_total_size(4) /* INET_DIAG_CLASS_ID */
                + nla_total_size(addrlen * asoc->peer.transport_count)
                + nla_total_size(addrlen * addrcnt)
-               + nla_total_size(sizeof(struct inet_diag_meminfo))
                + nla_total_size(sizeof(struct inet_diag_msg))
+               + inet_diag_msg_attrs_size()
+               + nla_total_size(sizeof(struct inet_diag_meminfo))
                + 64;
 }