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Message-ID: <20200221184703.22967-1-kafai@fb.com>
Date: Fri, 21 Feb 2020 10:47:03 -0800
From: Martin KaFai Lau <kafai@...com>
To: <bpf@...r.kernel.org>
CC: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
David Miller <davem@...emloft.net>, <kernel-team@...com>,
<netdev@...r.kernel.org>
Subject: [PATCH bpf-next 2/4] inet_diag: Move the INET_DIAG_REQ_BYTECODE nlattr to cb->data
The INET_DIAG_REQ_BYTECODE nlattr is currently re-found every time when
the "dump()" is re-started.
In a latter patch, it will also need to parse the new
INET_DIAG_REQ_SK_BPF_STORAGES nlattr to learn the map_fds. Thus, this
patch takes this chance to store the parsed nlattr in cb->data
during the "start" time of a dump.
By doing this, the "bc" argument also becomes unnecessary
and is removed. Also, the two copies of the INET_DIAG_REQ_BYTECODE
parsing-audit logic between compat/current version can be
consolidated to one.
Signed-off-by: Martin KaFai Lau <kafai@...com>
---
include/linux/inet_diag.h | 11 ++--
include/uapi/linux/inet_diag.h | 3 +-
net/dccp/diag.c | 4 +-
net/ipv4/inet_diag.c | 117 ++++++++++++++++++++-------------
net/ipv4/raw_diag.c | 6 +-
net/ipv4/tcp_diag.c | 4 +-
net/ipv4/udp_diag.c | 15 +++--
net/sctp/diag.c | 2 +-
8 files changed, 98 insertions(+), 64 deletions(-)
diff --git a/include/linux/inet_diag.h b/include/linux/inet_diag.h
index 6b157ce07d74..1bb94cac265f 100644
--- a/include/linux/inet_diag.h
+++ b/include/linux/inet_diag.h
@@ -15,8 +15,7 @@ struct netlink_callback;
struct inet_diag_handler {
void (*dump)(struct sk_buff *skb,
struct netlink_callback *cb,
- const struct inet_diag_req_v2 *r,
- struct nlattr *bc);
+ const struct inet_diag_req_v2 *r);
int (*dump_one)(struct netlink_callback *cb,
const struct inet_diag_req_v2 *req);
@@ -39,6 +38,11 @@ struct inet_diag_handler {
__u16 idiag_info_size;
};
+struct inet_diag_dump_data {
+ struct nlattr *req_nlas[__INET_DIAG_REQ_MAX];
+#define inet_diag_nla_bc req_nlas[INET_DIAG_REQ_BYTECODE]
+};
+
struct inet_connection_sock;
int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
struct sk_buff *skb, struct netlink_callback *cb,
@@ -46,8 +50,7 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
u16 nlmsg_flags, bool net_admin);
void inet_diag_dump_icsk(struct inet_hashinfo *h, struct sk_buff *skb,
struct netlink_callback *cb,
- const struct inet_diag_req_v2 *r,
- struct nlattr *bc);
+ const struct inet_diag_req_v2 *r);
int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *req);
diff --git a/include/uapi/linux/inet_diag.h b/include/uapi/linux/inet_diag.h
index a1ff345b3f33..bab9a9f8da12 100644
--- a/include/uapi/linux/inet_diag.h
+++ b/include/uapi/linux/inet_diag.h
@@ -64,9 +64,10 @@ struct inet_diag_req_raw {
enum {
INET_DIAG_REQ_NONE,
INET_DIAG_REQ_BYTECODE,
+ __INET_DIAG_REQ_MAX,
};
-#define INET_DIAG_REQ_MAX INET_DIAG_REQ_BYTECODE
+#define INET_DIAG_REQ_MAX (__INET_DIAG_REQ_MAX - 1)
/* Bytecode is sequence of 4 byte commands followed by variable arguments.
* All the commands identified by "code" are conditional jumps forward:
diff --git a/net/dccp/diag.c b/net/dccp/diag.c
index 8f1e2a653f6d..8a82c5a2c5a8 100644
--- a/net/dccp/diag.c
+++ b/net/dccp/diag.c
@@ -46,9 +46,9 @@ static void dccp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
}
static void dccp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
- const struct inet_diag_req_v2 *r, struct nlattr *bc)
+ const struct inet_diag_req_v2 *r)
{
- inet_diag_dump_icsk(&dccp_hashinfo, skb, cb, r, bc);
+ inet_diag_dump_icsk(&dccp_hashinfo, skb, cb, r);
}
static int dccp_diag_dump_one(struct netlink_callback *cb,
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index d2ecff3195ba..4bce8a477699 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -495,9 +495,11 @@ static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
if (IS_ERR(handler)) {
err = PTR_ERR(handler);
} else if (cmd == SOCK_DIAG_BY_FAMILY) {
+ struct inet_diag_dump_data empty_dump_data = {};
struct netlink_callback cb = {
.nlh = nlh,
.skb = in_skb,
+ .data = &empty_dump_data,
};
err = handler->dump_one(&cb, req);
} else if (cmd == SOCK_DESTROY && handler->destroy) {
@@ -863,14 +865,17 @@ static void twsk_build_assert(void)
void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
struct netlink_callback *cb,
- const struct inet_diag_req_v2 *r, struct nlattr *bc)
+ const struct inet_diag_req_v2 *r)
{
bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
+ struct inet_diag_dump_data *cb_data = cb->data;
struct net *net = sock_net(skb->sk);
u32 idiag_states = r->idiag_states;
int i, num, s_i, s_num;
+ struct nlattr *bc;
struct sock *sk;
+ bc = cb_data->inet_diag_nla_bc;
if (idiag_states & TCPF_SYN_RECV)
idiag_states |= TCPF_NEW_SYN_RECV;
s_i = cb->args[1];
@@ -1014,15 +1019,14 @@ void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
- const struct inet_diag_req_v2 *r,
- struct nlattr *bc)
+ const struct inet_diag_req_v2 *r)
{
const struct inet_diag_handler *handler;
int err = 0;
handler = inet_diag_lock_handler(r->sdiag_protocol);
if (!IS_ERR(handler))
- handler->dump(skb, cb, r, bc);
+ handler->dump(skb, cb, r);
else
err = PTR_ERR(handler);
inet_diag_unlock_handler(handler);
@@ -1032,13 +1036,57 @@ static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
- int hdrlen = sizeof(struct inet_diag_req_v2);
- struct nlattr *bc = NULL;
+ return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
+}
+
+static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
+{
+ const struct nlmsghdr *nlh = cb->nlh;
+ struct inet_diag_dump_data *cb_data;
+ struct sk_buff *skb = cb->skb;
+ struct nlattr *nla;
+ int rem, err;
+
+ cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL);
+ if (!cb_data)
+ return -ENOMEM;
+
+ nla_for_each_attr(nla, nlmsg_attrdata(nlh, hdrlen),
+ nlmsg_attrlen(nlh, hdrlen), rem) {
+ int type = nla_type(nla);
+
+ if (type < __INET_DIAG_REQ_MAX)
+ cb_data->req_nlas[type] = nla;
+ }
+
+ nla = cb_data->inet_diag_nla_bc;
+ if (nla) {
+ err = inet_diag_bc_audit(nla, skb);
+ if (err) {
+ kfree(cb_data);
+ return err;
+ }
+ }
+
+ cb->data = cb_data;
+ return 0;
+}
+
+static int inet_diag_dump_start(struct netlink_callback *cb)
+{
+ return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
+}
+
+static int inet_diag_dump_start_compat(struct netlink_callback *cb)
+{
+ return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
+}
- if (nlmsg_attrlen(cb->nlh, hdrlen))
- bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
+static int inet_diag_dump_done(struct netlink_callback *cb)
+{
+ kfree(cb->data);
- return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
+ return 0;
}
static int inet_diag_type2proto(int type)
@@ -1057,9 +1105,7 @@ static int inet_diag_dump_compat(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct inet_diag_req *rc = nlmsg_data(cb->nlh);
- int hdrlen = sizeof(struct inet_diag_req);
struct inet_diag_req_v2 req;
- struct nlattr *bc = NULL;
req.sdiag_family = AF_UNSPEC; /* compatibility */
req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
@@ -1067,10 +1113,7 @@ static int inet_diag_dump_compat(struct sk_buff *skb,
req.idiag_states = rc->idiag_states;
req.id = rc->id;
- if (nlmsg_attrlen(cb->nlh, hdrlen))
- bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
-
- return __inet_diag_dump(skb, cb, &req, bc);
+ return __inet_diag_dump(skb, cb, &req);
}
static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
@@ -1098,22 +1141,12 @@ static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
return -EINVAL;
if (nlh->nlmsg_flags & NLM_F_DUMP) {
- if (nlmsg_attrlen(nlh, hdrlen)) {
- struct nlattr *attr;
- int err;
-
- attr = nlmsg_find_attr(nlh, hdrlen,
- INET_DIAG_REQ_BYTECODE);
- err = inet_diag_bc_audit(attr, skb);
- if (err)
- return err;
- }
- {
- struct netlink_dump_control c = {
- .dump = inet_diag_dump_compat,
- };
- return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
- }
+ struct netlink_dump_control c = {
+ .start = inet_diag_dump_start_compat,
+ .done = inet_diag_dump_done,
+ .dump = inet_diag_dump_compat,
+ };
+ return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
}
return inet_diag_get_exact_compat(skb, nlh);
@@ -1129,22 +1162,12 @@ static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
h->nlmsg_flags & NLM_F_DUMP) {
- if (nlmsg_attrlen(h, hdrlen)) {
- struct nlattr *attr;
- int err;
-
- attr = nlmsg_find_attr(h, hdrlen,
- INET_DIAG_REQ_BYTECODE);
- err = inet_diag_bc_audit(attr, skb);
- if (err)
- return err;
- }
- {
- struct netlink_dump_control c = {
- .dump = inet_diag_dump,
- };
- return netlink_dump_start(net->diag_nlsk, skb, h, &c);
- }
+ struct netlink_dump_control c = {
+ .start = inet_diag_dump_start,
+ .done = inet_diag_dump_done,
+ .dump = inet_diag_dump,
+ };
+ return netlink_dump_start(net->diag_nlsk, skb, h, &c);
}
return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
diff --git a/net/ipv4/raw_diag.c b/net/ipv4/raw_diag.c
index a2933eeabd91..d19cce39be1b 100644
--- a/net/ipv4/raw_diag.c
+++ b/net/ipv4/raw_diag.c
@@ -138,17 +138,21 @@ static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
}
static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
- const struct inet_diag_req_v2 *r, struct nlattr *bc)
+ const struct inet_diag_req_v2 *r)
{
bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
struct net *net = sock_net(skb->sk);
+ struct inet_diag_dump_data *cb_data;
int num, s_num, slot, s_slot;
struct sock *sk = NULL;
+ struct nlattr *bc;
if (IS_ERR(hashinfo))
return;
+ cb_data = cb->data;
+ bc = cb_data->inet_diag_nla_bc;
s_slot = cb->args[0];
num = s_num = cb->args[1];
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index bcd3a26efff1..75a1c985f49a 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -179,9 +179,9 @@ static size_t tcp_diag_get_aux_size(struct sock *sk, bool net_admin)
}
static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
- const struct inet_diag_req_v2 *r, struct nlattr *bc)
+ const struct inet_diag_req_v2 *r)
{
- inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc);
+ inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r);
}
static int tcp_diag_dump_one(struct netlink_callback *cb,
diff --git a/net/ipv4/udp_diag.c b/net/ipv4/udp_diag.c
index 7d65a6a5cd51..93884696abdd 100644
--- a/net/ipv4/udp_diag.c
+++ b/net/ipv4/udp_diag.c
@@ -89,12 +89,16 @@ static int udp_dump_one(struct udp_table *tbl,
static void udp_dump(struct udp_table *table, struct sk_buff *skb,
struct netlink_callback *cb,
- const struct inet_diag_req_v2 *r, struct nlattr *bc)
+ const struct inet_diag_req_v2 *r)
{
bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
struct net *net = sock_net(skb->sk);
+ struct inet_diag_dump_data *cb_data;
int num, s_num, slot, s_slot;
+ struct nlattr *bc;
+ cb_data = cb->data;
+ bc = cb_data->inet_diag_nla_bc;
s_slot = cb->args[0];
num = s_num = cb->args[1];
@@ -142,9 +146,9 @@ static void udp_dump(struct udp_table *table, struct sk_buff *skb,
}
static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
- const struct inet_diag_req_v2 *r, struct nlattr *bc)
+ const struct inet_diag_req_v2 *r)
{
- udp_dump(&udp_table, skb, cb, r, bc);
+ udp_dump(&udp_table, skb, cb, r);
}
static int udp_diag_dump_one(struct netlink_callback *cb,
@@ -245,10 +249,9 @@ static const struct inet_diag_handler udp_diag_handler = {
};
static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
- const struct inet_diag_req_v2 *r,
- struct nlattr *bc)
+ const struct inet_diag_req_v2 *r)
{
- udp_dump(&udplite_table, skb, cb, r, bc);
+ udp_dump(&udplite_table, skb, cb, r);
}
static int udplite_diag_dump_one(struct netlink_callback *cb,
diff --git a/net/sctp/diag.c b/net/sctp/diag.c
index bed6436cd0af..69743a6aaf6f 100644
--- a/net/sctp/diag.c
+++ b/net/sctp/diag.c
@@ -471,7 +471,7 @@ static int sctp_diag_dump_one(struct netlink_callback *cb,
}
static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
- const struct inet_diag_req_v2 *r, struct nlattr *bc)
+ const struct inet_diag_req_v2 *r)
{
u32 idiag_states = r->idiag_states;
struct net *net = sock_net(skb->sk);
--
2.17.1
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