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![Martin KaFai Lau](/assets/img/avatar_default.png)
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@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/20200225230415.1975555-1-kafai@fb.com
238 lines
5.5 KiB
C
238 lines
5.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* tcp_diag.c Module for monitoring TCP transport protocols sockets.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*/
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#include <linux/module.h>
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#include <linux/net.h>
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#include <linux/sock_diag.h>
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#include <linux/inet_diag.h>
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#include <linux/tcp.h>
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#include <net/netlink.h>
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#include <net/tcp.h>
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static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
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void *_info)
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{
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struct tcp_info *info = _info;
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if (inet_sk_state_load(sk) == TCP_LISTEN) {
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r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog);
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r->idiag_wqueue = READ_ONCE(sk->sk_max_ack_backlog);
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} else if (sk->sk_type == SOCK_STREAM) {
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const struct tcp_sock *tp = tcp_sk(sk);
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r->idiag_rqueue = max_t(int, READ_ONCE(tp->rcv_nxt) -
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READ_ONCE(tp->copied_seq), 0);
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r->idiag_wqueue = READ_ONCE(tp->write_seq) - tp->snd_una;
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}
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if (info)
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tcp_get_info(sk, info);
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}
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#ifdef CONFIG_TCP_MD5SIG
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static void tcp_diag_md5sig_fill(struct tcp_diag_md5sig *info,
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const struct tcp_md5sig_key *key)
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{
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info->tcpm_family = key->family;
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info->tcpm_prefixlen = key->prefixlen;
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info->tcpm_keylen = key->keylen;
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memcpy(info->tcpm_key, key->key, key->keylen);
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if (key->family == AF_INET)
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info->tcpm_addr[0] = key->addr.a4.s_addr;
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#if IS_ENABLED(CONFIG_IPV6)
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else if (key->family == AF_INET6)
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memcpy(&info->tcpm_addr, &key->addr.a6,
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sizeof(info->tcpm_addr));
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#endif
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}
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static int tcp_diag_put_md5sig(struct sk_buff *skb,
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const struct tcp_md5sig_info *md5sig)
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{
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const struct tcp_md5sig_key *key;
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struct tcp_diag_md5sig *info;
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struct nlattr *attr;
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int md5sig_count = 0;
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hlist_for_each_entry_rcu(key, &md5sig->head, node)
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md5sig_count++;
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if (md5sig_count == 0)
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return 0;
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attr = nla_reserve(skb, INET_DIAG_MD5SIG,
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md5sig_count * sizeof(struct tcp_diag_md5sig));
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if (!attr)
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return -EMSGSIZE;
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info = nla_data(attr);
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memset(info, 0, md5sig_count * sizeof(struct tcp_diag_md5sig));
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hlist_for_each_entry_rcu(key, &md5sig->head, node) {
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tcp_diag_md5sig_fill(info++, key);
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if (--md5sig_count == 0)
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break;
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}
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return 0;
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}
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#endif
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static int tcp_diag_put_ulp(struct sk_buff *skb, struct sock *sk,
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const struct tcp_ulp_ops *ulp_ops)
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{
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struct nlattr *nest;
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int err;
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nest = nla_nest_start_noflag(skb, INET_DIAG_ULP_INFO);
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if (!nest)
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return -EMSGSIZE;
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err = nla_put_string(skb, INET_ULP_INFO_NAME, ulp_ops->name);
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if (err)
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goto nla_failure;
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if (ulp_ops->get_info)
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err = ulp_ops->get_info(sk, skb);
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if (err)
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goto nla_failure;
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nla_nest_end(skb, nest);
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return 0;
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nla_failure:
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nla_nest_cancel(skb, nest);
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return err;
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}
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static int tcp_diag_get_aux(struct sock *sk, bool net_admin,
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struct sk_buff *skb)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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int err = 0;
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#ifdef CONFIG_TCP_MD5SIG
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if (net_admin) {
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struct tcp_md5sig_info *md5sig;
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rcu_read_lock();
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md5sig = rcu_dereference(tcp_sk(sk)->md5sig_info);
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if (md5sig)
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err = tcp_diag_put_md5sig(skb, md5sig);
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rcu_read_unlock();
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if (err < 0)
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return err;
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}
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#endif
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if (net_admin) {
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const struct tcp_ulp_ops *ulp_ops;
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ulp_ops = icsk->icsk_ulp_ops;
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if (ulp_ops)
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err = tcp_diag_put_ulp(skb, sk, ulp_ops);
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if (err)
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return err;
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}
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return 0;
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}
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static size_t tcp_diag_get_aux_size(struct sock *sk, bool net_admin)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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size_t size = 0;
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#ifdef CONFIG_TCP_MD5SIG
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if (net_admin && sk_fullsock(sk)) {
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const struct tcp_md5sig_info *md5sig;
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const struct tcp_md5sig_key *key;
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size_t md5sig_count = 0;
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rcu_read_lock();
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md5sig = rcu_dereference(tcp_sk(sk)->md5sig_info);
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if (md5sig) {
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hlist_for_each_entry_rcu(key, &md5sig->head, node)
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md5sig_count++;
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}
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rcu_read_unlock();
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size += nla_total_size(md5sig_count *
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sizeof(struct tcp_diag_md5sig));
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}
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#endif
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if (net_admin && sk_fullsock(sk)) {
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const struct tcp_ulp_ops *ulp_ops;
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ulp_ops = icsk->icsk_ulp_ops;
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if (ulp_ops) {
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size += nla_total_size(0) +
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nla_total_size(TCP_ULP_NAME_MAX);
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if (ulp_ops->get_info_size)
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size += ulp_ops->get_info_size(sk);
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}
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}
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return size;
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}
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static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
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const struct inet_diag_req_v2 *r)
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{
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inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r);
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}
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static int tcp_diag_dump_one(struct netlink_callback *cb,
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const struct inet_diag_req_v2 *req)
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{
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return inet_diag_dump_one_icsk(&tcp_hashinfo, cb, req);
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}
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#ifdef CONFIG_INET_DIAG_DESTROY
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static int tcp_diag_destroy(struct sk_buff *in_skb,
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const struct inet_diag_req_v2 *req)
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{
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struct net *net = sock_net(in_skb->sk);
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struct sock *sk = inet_diag_find_one_icsk(net, &tcp_hashinfo, req);
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int err;
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if (IS_ERR(sk))
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return PTR_ERR(sk);
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err = sock_diag_destroy(sk, ECONNABORTED);
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sock_gen_put(sk);
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return err;
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}
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#endif
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static const struct inet_diag_handler tcp_diag_handler = {
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.dump = tcp_diag_dump,
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.dump_one = tcp_diag_dump_one,
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.idiag_get_info = tcp_diag_get_info,
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.idiag_get_aux = tcp_diag_get_aux,
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.idiag_get_aux_size = tcp_diag_get_aux_size,
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.idiag_type = IPPROTO_TCP,
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.idiag_info_size = sizeof(struct tcp_info),
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#ifdef CONFIG_INET_DIAG_DESTROY
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.destroy = tcp_diag_destroy,
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#endif
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};
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static int __init tcp_diag_init(void)
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{
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return inet_diag_register(&tcp_diag_handler);
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}
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static void __exit tcp_diag_exit(void)
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{
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inet_diag_unregister(&tcp_diag_handler);
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}
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module_init(tcp_diag_init);
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module_exit(tcp_diag_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */);
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