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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 05:36:39 +07:00
0491026507
Ensure that cmsg->cmsg_type value is valid for qpolicy that is currently in use. Signed-off-by: Tomasz Grobelny <tomasz@grobelny.oswiecenia.net> Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
1258 lines
30 KiB
C
1258 lines
30 KiB
C
/*
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* net/dccp/proto.c
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*
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* An implementation of the DCCP protocol
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/dccp.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/in.h>
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#include <linux/if_arp.h>
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#include <linux/init.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <net/checksum.h>
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#include <net/inet_sock.h>
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#include <net/sock.h>
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#include <net/xfrm.h>
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#include <asm/ioctls.h>
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#include <linux/spinlock.h>
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#include <linux/timer.h>
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#include <linux/delay.h>
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#include <linux/poll.h>
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#include "ccid.h"
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#include "dccp.h"
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#include "feat.h"
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DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly;
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EXPORT_SYMBOL_GPL(dccp_statistics);
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struct percpu_counter dccp_orphan_count;
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EXPORT_SYMBOL_GPL(dccp_orphan_count);
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struct inet_hashinfo dccp_hashinfo;
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EXPORT_SYMBOL_GPL(dccp_hashinfo);
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/* the maximum queue length for tx in packets. 0 is no limit */
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int sysctl_dccp_tx_qlen __read_mostly = 5;
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#ifdef CONFIG_IP_DCCP_DEBUG
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static const char *dccp_state_name(const int state)
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{
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static const char *const dccp_state_names[] = {
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[DCCP_OPEN] = "OPEN",
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[DCCP_REQUESTING] = "REQUESTING",
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[DCCP_PARTOPEN] = "PARTOPEN",
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[DCCP_LISTEN] = "LISTEN",
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[DCCP_RESPOND] = "RESPOND",
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[DCCP_CLOSING] = "CLOSING",
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[DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ",
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[DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE",
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[DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ",
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[DCCP_TIME_WAIT] = "TIME_WAIT",
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[DCCP_CLOSED] = "CLOSED",
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};
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if (state >= DCCP_MAX_STATES)
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return "INVALID STATE!";
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else
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return dccp_state_names[state];
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}
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#endif
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void dccp_set_state(struct sock *sk, const int state)
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{
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const int oldstate = sk->sk_state;
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dccp_pr_debug("%s(%p) %s --> %s\n", dccp_role(sk), sk,
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dccp_state_name(oldstate), dccp_state_name(state));
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WARN_ON(state == oldstate);
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switch (state) {
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case DCCP_OPEN:
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if (oldstate != DCCP_OPEN)
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DCCP_INC_STATS(DCCP_MIB_CURRESTAB);
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/* Client retransmits all Confirm options until entering OPEN */
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if (oldstate == DCCP_PARTOPEN)
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dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg);
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break;
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case DCCP_CLOSED:
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if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ ||
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oldstate == DCCP_CLOSING)
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DCCP_INC_STATS(DCCP_MIB_ESTABRESETS);
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sk->sk_prot->unhash(sk);
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if (inet_csk(sk)->icsk_bind_hash != NULL &&
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!(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
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inet_put_port(sk);
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/* fall through */
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default:
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if (oldstate == DCCP_OPEN)
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DCCP_DEC_STATS(DCCP_MIB_CURRESTAB);
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}
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/* Change state AFTER socket is unhashed to avoid closed
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* socket sitting in hash tables.
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*/
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sk->sk_state = state;
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}
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EXPORT_SYMBOL_GPL(dccp_set_state);
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static void dccp_finish_passive_close(struct sock *sk)
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{
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switch (sk->sk_state) {
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case DCCP_PASSIVE_CLOSE:
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/* Node (client or server) has received Close packet. */
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dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED);
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dccp_set_state(sk, DCCP_CLOSED);
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break;
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case DCCP_PASSIVE_CLOSEREQ:
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/*
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* Client received CloseReq. We set the `active' flag so that
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* dccp_send_close() retransmits the Close as per RFC 4340, 8.3.
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*/
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dccp_send_close(sk, 1);
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dccp_set_state(sk, DCCP_CLOSING);
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}
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}
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void dccp_done(struct sock *sk)
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{
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dccp_set_state(sk, DCCP_CLOSED);
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dccp_clear_xmit_timers(sk);
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sk->sk_shutdown = SHUTDOWN_MASK;
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if (!sock_flag(sk, SOCK_DEAD))
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sk->sk_state_change(sk);
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else
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inet_csk_destroy_sock(sk);
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}
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EXPORT_SYMBOL_GPL(dccp_done);
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const char *dccp_packet_name(const int type)
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{
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static const char *const dccp_packet_names[] = {
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[DCCP_PKT_REQUEST] = "REQUEST",
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[DCCP_PKT_RESPONSE] = "RESPONSE",
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[DCCP_PKT_DATA] = "DATA",
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[DCCP_PKT_ACK] = "ACK",
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[DCCP_PKT_DATAACK] = "DATAACK",
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[DCCP_PKT_CLOSEREQ] = "CLOSEREQ",
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[DCCP_PKT_CLOSE] = "CLOSE",
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[DCCP_PKT_RESET] = "RESET",
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[DCCP_PKT_SYNC] = "SYNC",
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[DCCP_PKT_SYNCACK] = "SYNCACK",
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};
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if (type >= DCCP_NR_PKT_TYPES)
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return "INVALID";
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else
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return dccp_packet_names[type];
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}
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EXPORT_SYMBOL_GPL(dccp_packet_name);
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int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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struct inet_connection_sock *icsk = inet_csk(sk);
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icsk->icsk_rto = DCCP_TIMEOUT_INIT;
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icsk->icsk_syn_retries = sysctl_dccp_request_retries;
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sk->sk_state = DCCP_CLOSED;
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sk->sk_write_space = dccp_write_space;
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icsk->icsk_sync_mss = dccp_sync_mss;
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dp->dccps_mss_cache = 536;
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dp->dccps_rate_last = jiffies;
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dp->dccps_role = DCCP_ROLE_UNDEFINED;
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dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT;
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dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1;
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dp->dccps_tx_qlen = sysctl_dccp_tx_qlen;
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dccp_init_xmit_timers(sk);
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INIT_LIST_HEAD(&dp->dccps_featneg);
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/* control socket doesn't need feat nego */
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if (likely(ctl_sock_initialized))
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return dccp_feat_init(sk);
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return 0;
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}
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EXPORT_SYMBOL_GPL(dccp_init_sock);
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void dccp_destroy_sock(struct sock *sk)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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/*
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* DCCP doesn't use sk_write_queue, just sk_send_head
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* for retransmissions
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*/
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if (sk->sk_send_head != NULL) {
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kfree_skb(sk->sk_send_head);
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sk->sk_send_head = NULL;
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}
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/* Clean up a referenced DCCP bind bucket. */
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if (inet_csk(sk)->icsk_bind_hash != NULL)
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inet_put_port(sk);
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kfree(dp->dccps_service_list);
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dp->dccps_service_list = NULL;
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if (dp->dccps_hc_rx_ackvec != NULL) {
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dccp_ackvec_free(dp->dccps_hc_rx_ackvec);
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dp->dccps_hc_rx_ackvec = NULL;
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}
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ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk);
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ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
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dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;
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/* clean up feature negotiation state */
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dccp_feat_list_purge(&dp->dccps_featneg);
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}
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EXPORT_SYMBOL_GPL(dccp_destroy_sock);
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static inline int dccp_listen_start(struct sock *sk, int backlog)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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dp->dccps_role = DCCP_ROLE_LISTEN;
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/* do not start to listen if feature negotiation setup fails */
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if (dccp_feat_finalise_settings(dp))
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return -EPROTO;
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return inet_csk_listen_start(sk, backlog);
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}
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static inline int dccp_need_reset(int state)
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{
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return state != DCCP_CLOSED && state != DCCP_LISTEN &&
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state != DCCP_REQUESTING;
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}
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int dccp_disconnect(struct sock *sk, int flags)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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struct inet_sock *inet = inet_sk(sk);
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int err = 0;
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const int old_state = sk->sk_state;
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if (old_state != DCCP_CLOSED)
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dccp_set_state(sk, DCCP_CLOSED);
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/*
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* This corresponds to the ABORT function of RFC793, sec. 3.8
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* TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted".
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*/
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if (old_state == DCCP_LISTEN) {
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inet_csk_listen_stop(sk);
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} else if (dccp_need_reset(old_state)) {
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dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED);
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sk->sk_err = ECONNRESET;
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} else if (old_state == DCCP_REQUESTING)
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sk->sk_err = ECONNRESET;
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dccp_clear_xmit_timers(sk);
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__skb_queue_purge(&sk->sk_receive_queue);
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__skb_queue_purge(&sk->sk_write_queue);
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if (sk->sk_send_head != NULL) {
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__kfree_skb(sk->sk_send_head);
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sk->sk_send_head = NULL;
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}
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inet->inet_dport = 0;
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if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
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inet_reset_saddr(sk);
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sk->sk_shutdown = 0;
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sock_reset_flag(sk, SOCK_DONE);
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icsk->icsk_backoff = 0;
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inet_csk_delack_init(sk);
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__sk_dst_reset(sk);
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WARN_ON(inet->inet_num && !icsk->icsk_bind_hash);
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sk->sk_error_report(sk);
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return err;
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}
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EXPORT_SYMBOL_GPL(dccp_disconnect);
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/*
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* Wait for a DCCP event.
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*
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* Note that we don't need to lock the socket, as the upper poll layers
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* take care of normal races (between the test and the event) and we don't
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* go look at any of the socket buffers directly.
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*/
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unsigned int dccp_poll(struct file *file, struct socket *sock,
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poll_table *wait)
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{
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unsigned int mask;
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struct sock *sk = sock->sk;
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sock_poll_wait(file, sk_sleep(sk), wait);
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if (sk->sk_state == DCCP_LISTEN)
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return inet_csk_listen_poll(sk);
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/* Socket is not locked. We are protected from async events
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by poll logic and correct handling of state changes
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made by another threads is impossible in any case.
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*/
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mask = 0;
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if (sk->sk_err)
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mask = POLLERR;
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if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED)
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mask |= POLLHUP;
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if (sk->sk_shutdown & RCV_SHUTDOWN)
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mask |= POLLIN | POLLRDNORM | POLLRDHUP;
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/* Connected? */
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if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) {
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if (atomic_read(&sk->sk_rmem_alloc) > 0)
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mask |= POLLIN | POLLRDNORM;
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if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
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if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
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mask |= POLLOUT | POLLWRNORM;
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} else { /* send SIGIO later */
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set_bit(SOCK_ASYNC_NOSPACE,
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&sk->sk_socket->flags);
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set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
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/* Race breaker. If space is freed after
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* wspace test but before the flags are set,
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* IO signal will be lost.
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*/
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if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
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mask |= POLLOUT | POLLWRNORM;
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}
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}
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}
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return mask;
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}
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EXPORT_SYMBOL_GPL(dccp_poll);
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int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg)
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{
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int rc = -ENOTCONN;
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lock_sock(sk);
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if (sk->sk_state == DCCP_LISTEN)
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goto out;
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switch (cmd) {
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case SIOCINQ: {
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struct sk_buff *skb;
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unsigned long amount = 0;
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skb = skb_peek(&sk->sk_receive_queue);
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if (skb != NULL) {
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/*
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* We will only return the amount of this packet since
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* that is all that will be read.
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*/
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amount = skb->len;
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}
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rc = put_user(amount, (int __user *)arg);
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}
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break;
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default:
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rc = -ENOIOCTLCMD;
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break;
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}
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out:
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release_sock(sk);
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return rc;
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}
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EXPORT_SYMBOL_GPL(dccp_ioctl);
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static int dccp_setsockopt_service(struct sock *sk, const __be32 service,
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char __user *optval, unsigned int optlen)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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struct dccp_service_list *sl = NULL;
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if (service == DCCP_SERVICE_INVALID_VALUE ||
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optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32))
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return -EINVAL;
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if (optlen > sizeof(service)) {
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sl = kmalloc(optlen, GFP_KERNEL);
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if (sl == NULL)
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return -ENOMEM;
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sl->dccpsl_nr = optlen / sizeof(u32) - 1;
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if (copy_from_user(sl->dccpsl_list,
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optval + sizeof(service),
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optlen - sizeof(service)) ||
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dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) {
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kfree(sl);
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return -EFAULT;
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}
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}
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lock_sock(sk);
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dp->dccps_service = service;
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kfree(dp->dccps_service_list);
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dp->dccps_service_list = sl;
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release_sock(sk);
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return 0;
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}
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static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx)
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{
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u8 *list, len;
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int i, rc;
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if (cscov < 0 || cscov > 15)
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return -EINVAL;
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/*
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* Populate a list of permissible values, in the range cscov...15. This
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* is necessary since feature negotiation of single values only works if
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* both sides incidentally choose the same value. Since the list starts
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* lowest-value first, negotiation will pick the smallest shared value.
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*/
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if (cscov == 0)
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return 0;
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len = 16 - cscov;
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list = kmalloc(len, GFP_KERNEL);
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if (list == NULL)
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return -ENOBUFS;
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for (i = 0; i < len; i++)
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list[i] = cscov++;
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rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len);
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if (rc == 0) {
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if (rx)
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dccp_sk(sk)->dccps_pcrlen = cscov;
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else
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dccp_sk(sk)->dccps_pcslen = cscov;
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}
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kfree(list);
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return rc;
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}
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|
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static int dccp_setsockopt_ccid(struct sock *sk, int type,
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char __user *optval, unsigned int optlen)
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{
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u8 *val;
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int rc = 0;
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if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS)
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return -EINVAL;
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val = memdup_user(optval, optlen);
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if (IS_ERR(val))
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return PTR_ERR(val);
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|
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lock_sock(sk);
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if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID)
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rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen);
|
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|
|
if (!rc && (type == DCCP_SOCKOPT_RX_CCID || type == DCCP_SOCKOPT_CCID))
|
|
rc = dccp_feat_register_sp(sk, DCCPF_CCID, 0, val, optlen);
|
|
release_sock(sk);
|
|
|
|
kfree(val);
|
|
return rc;
|
|
}
|
|
|
|
static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
int val, err = 0;
|
|
|
|
switch (optname) {
|
|
case DCCP_SOCKOPT_PACKET_SIZE:
|
|
DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
|
|
return 0;
|
|
case DCCP_SOCKOPT_CHANGE_L:
|
|
case DCCP_SOCKOPT_CHANGE_R:
|
|
DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n");
|
|
return 0;
|
|
case DCCP_SOCKOPT_CCID:
|
|
case DCCP_SOCKOPT_RX_CCID:
|
|
case DCCP_SOCKOPT_TX_CCID:
|
|
return dccp_setsockopt_ccid(sk, optname, optval, optlen);
|
|
}
|
|
|
|
if (optlen < (int)sizeof(int))
|
|
return -EINVAL;
|
|
|
|
if (get_user(val, (int __user *)optval))
|
|
return -EFAULT;
|
|
|
|
if (optname == DCCP_SOCKOPT_SERVICE)
|
|
return dccp_setsockopt_service(sk, val, optval, optlen);
|
|
|
|
lock_sock(sk);
|
|
switch (optname) {
|
|
case DCCP_SOCKOPT_SERVER_TIMEWAIT:
|
|
if (dp->dccps_role != DCCP_ROLE_SERVER)
|
|
err = -EOPNOTSUPP;
|
|
else
|
|
dp->dccps_server_timewait = (val != 0);
|
|
break;
|
|
case DCCP_SOCKOPT_SEND_CSCOV:
|
|
err = dccp_setsockopt_cscov(sk, val, false);
|
|
break;
|
|
case DCCP_SOCKOPT_RECV_CSCOV:
|
|
err = dccp_setsockopt_cscov(sk, val, true);
|
|
break;
|
|
case DCCP_SOCKOPT_QPOLICY_ID:
|
|
if (sk->sk_state != DCCP_CLOSED)
|
|
err = -EISCONN;
|
|
else if (val < 0 || val >= DCCPQ_POLICY_MAX)
|
|
err = -EINVAL;
|
|
else
|
|
dp->dccps_qpolicy = val;
|
|
break;
|
|
case DCCP_SOCKOPT_QPOLICY_TXQLEN:
|
|
if (val < 0)
|
|
err = -EINVAL;
|
|
else
|
|
dp->dccps_tx_qlen = val;
|
|
break;
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
release_sock(sk);
|
|
|
|
return err;
|
|
}
|
|
|
|
int dccp_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
if (level != SOL_DCCP)
|
|
return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level,
|
|
optname, optval,
|
|
optlen);
|
|
return do_dccp_setsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_setsockopt);
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
int compat_dccp_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
if (level != SOL_DCCP)
|
|
return inet_csk_compat_setsockopt(sk, level, optname,
|
|
optval, optlen);
|
|
return do_dccp_setsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(compat_dccp_setsockopt);
|
|
#endif
|
|
|
|
static int dccp_getsockopt_service(struct sock *sk, int len,
|
|
__be32 __user *optval,
|
|
int __user *optlen)
|
|
{
|
|
const struct dccp_sock *dp = dccp_sk(sk);
|
|
const struct dccp_service_list *sl;
|
|
int err = -ENOENT, slen = 0, total_len = sizeof(u32);
|
|
|
|
lock_sock(sk);
|
|
if ((sl = dp->dccps_service_list) != NULL) {
|
|
slen = sl->dccpsl_nr * sizeof(u32);
|
|
total_len += slen;
|
|
}
|
|
|
|
err = -EINVAL;
|
|
if (total_len > len)
|
|
goto out;
|
|
|
|
err = 0;
|
|
if (put_user(total_len, optlen) ||
|
|
put_user(dp->dccps_service, optval) ||
|
|
(sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen)))
|
|
err = -EFAULT;
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int do_dccp_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct dccp_sock *dp;
|
|
int val, len;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
if (len < (int)sizeof(int))
|
|
return -EINVAL;
|
|
|
|
dp = dccp_sk(sk);
|
|
|
|
switch (optname) {
|
|
case DCCP_SOCKOPT_PACKET_SIZE:
|
|
DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
|
|
return 0;
|
|
case DCCP_SOCKOPT_SERVICE:
|
|
return dccp_getsockopt_service(sk, len,
|
|
(__be32 __user *)optval, optlen);
|
|
case DCCP_SOCKOPT_GET_CUR_MPS:
|
|
val = dp->dccps_mss_cache;
|
|
break;
|
|
case DCCP_SOCKOPT_AVAILABLE_CCIDS:
|
|
return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen);
|
|
case DCCP_SOCKOPT_TX_CCID:
|
|
val = ccid_get_current_tx_ccid(dp);
|
|
if (val < 0)
|
|
return -ENOPROTOOPT;
|
|
break;
|
|
case DCCP_SOCKOPT_RX_CCID:
|
|
val = ccid_get_current_rx_ccid(dp);
|
|
if (val < 0)
|
|
return -ENOPROTOOPT;
|
|
break;
|
|
case DCCP_SOCKOPT_SERVER_TIMEWAIT:
|
|
val = dp->dccps_server_timewait;
|
|
break;
|
|
case DCCP_SOCKOPT_SEND_CSCOV:
|
|
val = dp->dccps_pcslen;
|
|
break;
|
|
case DCCP_SOCKOPT_RECV_CSCOV:
|
|
val = dp->dccps_pcrlen;
|
|
break;
|
|
case DCCP_SOCKOPT_QPOLICY_ID:
|
|
val = dp->dccps_qpolicy;
|
|
break;
|
|
case DCCP_SOCKOPT_QPOLICY_TXQLEN:
|
|
val = dp->dccps_tx_qlen;
|
|
break;
|
|
case 128 ... 191:
|
|
return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname,
|
|
len, (u32 __user *)optval, optlen);
|
|
case 192 ... 255:
|
|
return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname,
|
|
len, (u32 __user *)optval, optlen);
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
len = sizeof(val);
|
|
if (put_user(len, optlen) || copy_to_user(optval, &val, len))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dccp_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
if (level != SOL_DCCP)
|
|
return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level,
|
|
optname, optval,
|
|
optlen);
|
|
return do_dccp_getsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_getsockopt);
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
int compat_dccp_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
if (level != SOL_DCCP)
|
|
return inet_csk_compat_getsockopt(sk, level, optname,
|
|
optval, optlen);
|
|
return do_dccp_getsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(compat_dccp_getsockopt);
|
|
#endif
|
|
|
|
static int dccp_msghdr_parse(struct msghdr *msg, struct sk_buff *skb)
|
|
{
|
|
struct cmsghdr *cmsg = CMSG_FIRSTHDR(msg);
|
|
|
|
/*
|
|
* Assign an (opaque) qpolicy priority value to skb->priority.
|
|
*
|
|
* We are overloading this skb field for use with the qpolicy subystem.
|
|
* The skb->priority is normally used for the SO_PRIORITY option, which
|
|
* is initialised from sk_priority. Since the assignment of sk_priority
|
|
* to skb->priority happens later (on layer 3), we overload this field
|
|
* for use with queueing priorities as long as the skb is on layer 4.
|
|
* The default priority value (if nothing is set) is 0.
|
|
*/
|
|
skb->priority = 0;
|
|
|
|
for (; cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) {
|
|
|
|
if (!CMSG_OK(msg, cmsg))
|
|
return -EINVAL;
|
|
|
|
if (cmsg->cmsg_level != SOL_DCCP)
|
|
continue;
|
|
|
|
if (cmsg->cmsg_type <= DCCP_SCM_QPOLICY_MAX &&
|
|
!dccp_qpolicy_param_ok(skb->sk, cmsg->cmsg_type))
|
|
return -EINVAL;
|
|
|
|
switch (cmsg->cmsg_type) {
|
|
case DCCP_SCM_PRIORITY:
|
|
if (cmsg->cmsg_len != CMSG_LEN(sizeof(__u32)))
|
|
return -EINVAL;
|
|
skb->priority = *(__u32 *)CMSG_DATA(cmsg);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
|
|
size_t len)
|
|
{
|
|
const struct dccp_sock *dp = dccp_sk(sk);
|
|
const int flags = msg->msg_flags;
|
|
const int noblock = flags & MSG_DONTWAIT;
|
|
struct sk_buff *skb;
|
|
int rc, size;
|
|
long timeo;
|
|
|
|
if (len > dp->dccps_mss_cache)
|
|
return -EMSGSIZE;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (dccp_qpolicy_full(sk)) {
|
|
rc = -EAGAIN;
|
|
goto out_release;
|
|
}
|
|
|
|
timeo = sock_sndtimeo(sk, noblock);
|
|
|
|
/*
|
|
* We have to use sk_stream_wait_connect here to set sk_write_pending,
|
|
* so that the trick in dccp_rcv_request_sent_state_process.
|
|
*/
|
|
/* Wait for a connection to finish. */
|
|
if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN))
|
|
if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0)
|
|
goto out_release;
|
|
|
|
size = sk->sk_prot->max_header + len;
|
|
release_sock(sk);
|
|
skb = sock_alloc_send_skb(sk, size, noblock, &rc);
|
|
lock_sock(sk);
|
|
if (skb == NULL)
|
|
goto out_release;
|
|
|
|
skb_reserve(skb, sk->sk_prot->max_header);
|
|
rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
|
|
if (rc != 0)
|
|
goto out_discard;
|
|
|
|
rc = dccp_msghdr_parse(msg, skb);
|
|
if (rc != 0)
|
|
goto out_discard;
|
|
|
|
dccp_qpolicy_push(sk, skb);
|
|
/*
|
|
* The xmit_timer is set if the TX CCID is rate-based and will expire
|
|
* when congestion control permits to release further packets into the
|
|
* network. Window-based CCIDs do not use this timer.
|
|
*/
|
|
if (!timer_pending(&dp->dccps_xmit_timer))
|
|
dccp_write_xmit(sk);
|
|
out_release:
|
|
release_sock(sk);
|
|
return rc ? : len;
|
|
out_discard:
|
|
kfree_skb(skb);
|
|
goto out_release;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_sendmsg);
|
|
|
|
int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
|
|
size_t len, int nonblock, int flags, int *addr_len)
|
|
{
|
|
const struct dccp_hdr *dh;
|
|
long timeo;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state == DCCP_LISTEN) {
|
|
len = -ENOTCONN;
|
|
goto out;
|
|
}
|
|
|
|
timeo = sock_rcvtimeo(sk, nonblock);
|
|
|
|
do {
|
|
struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
|
|
|
|
if (skb == NULL)
|
|
goto verify_sock_status;
|
|
|
|
dh = dccp_hdr(skb);
|
|
|
|
switch (dh->dccph_type) {
|
|
case DCCP_PKT_DATA:
|
|
case DCCP_PKT_DATAACK:
|
|
goto found_ok_skb;
|
|
|
|
case DCCP_PKT_CLOSE:
|
|
case DCCP_PKT_CLOSEREQ:
|
|
if (!(flags & MSG_PEEK))
|
|
dccp_finish_passive_close(sk);
|
|
/* fall through */
|
|
case DCCP_PKT_RESET:
|
|
dccp_pr_debug("found fin (%s) ok!\n",
|
|
dccp_packet_name(dh->dccph_type));
|
|
len = 0;
|
|
goto found_fin_ok;
|
|
default:
|
|
dccp_pr_debug("packet_type=%s\n",
|
|
dccp_packet_name(dh->dccph_type));
|
|
sk_eat_skb(sk, skb, 0);
|
|
}
|
|
verify_sock_status:
|
|
if (sock_flag(sk, SOCK_DONE)) {
|
|
len = 0;
|
|
break;
|
|
}
|
|
|
|
if (sk->sk_err) {
|
|
len = sock_error(sk);
|
|
break;
|
|
}
|
|
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN) {
|
|
len = 0;
|
|
break;
|
|
}
|
|
|
|
if (sk->sk_state == DCCP_CLOSED) {
|
|
if (!sock_flag(sk, SOCK_DONE)) {
|
|
/* This occurs when user tries to read
|
|
* from never connected socket.
|
|
*/
|
|
len = -ENOTCONN;
|
|
break;
|
|
}
|
|
len = 0;
|
|
break;
|
|
}
|
|
|
|
if (!timeo) {
|
|
len = -EAGAIN;
|
|
break;
|
|
}
|
|
|
|
if (signal_pending(current)) {
|
|
len = sock_intr_errno(timeo);
|
|
break;
|
|
}
|
|
|
|
sk_wait_data(sk, &timeo);
|
|
continue;
|
|
found_ok_skb:
|
|
if (len > skb->len)
|
|
len = skb->len;
|
|
else if (len < skb->len)
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
|
|
if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) {
|
|
/* Exception. Bailout! */
|
|
len = -EFAULT;
|
|
break;
|
|
}
|
|
if (flags & MSG_TRUNC)
|
|
len = skb->len;
|
|
found_fin_ok:
|
|
if (!(flags & MSG_PEEK))
|
|
sk_eat_skb(sk, skb, 0);
|
|
break;
|
|
} while (1);
|
|
out:
|
|
release_sock(sk);
|
|
return len;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_recvmsg);
|
|
|
|
int inet_dccp_listen(struct socket *sock, int backlog)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
unsigned char old_state;
|
|
int err;
|
|
|
|
lock_sock(sk);
|
|
|
|
err = -EINVAL;
|
|
if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP)
|
|
goto out;
|
|
|
|
old_state = sk->sk_state;
|
|
if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN)))
|
|
goto out;
|
|
|
|
/* Really, if the socket is already in listen state
|
|
* we can only allow the backlog to be adjusted.
|
|
*/
|
|
if (old_state != DCCP_LISTEN) {
|
|
/*
|
|
* FIXME: here it probably should be sk->sk_prot->listen_start
|
|
* see tcp_listen_start
|
|
*/
|
|
err = dccp_listen_start(sk, backlog);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
sk->sk_max_ack_backlog = backlog;
|
|
err = 0;
|
|
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(inet_dccp_listen);
|
|
|
|
static void dccp_terminate_connection(struct sock *sk)
|
|
{
|
|
u8 next_state = DCCP_CLOSED;
|
|
|
|
switch (sk->sk_state) {
|
|
case DCCP_PASSIVE_CLOSE:
|
|
case DCCP_PASSIVE_CLOSEREQ:
|
|
dccp_finish_passive_close(sk);
|
|
break;
|
|
case DCCP_PARTOPEN:
|
|
dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk);
|
|
inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK);
|
|
/* fall through */
|
|
case DCCP_OPEN:
|
|
dccp_send_close(sk, 1);
|
|
|
|
if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER &&
|
|
!dccp_sk(sk)->dccps_server_timewait)
|
|
next_state = DCCP_ACTIVE_CLOSEREQ;
|
|
else
|
|
next_state = DCCP_CLOSING;
|
|
/* fall through */
|
|
default:
|
|
dccp_set_state(sk, next_state);
|
|
}
|
|
}
|
|
|
|
void dccp_close(struct sock *sk, long timeout)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct sk_buff *skb;
|
|
u32 data_was_unread = 0;
|
|
int state;
|
|
|
|
lock_sock(sk);
|
|
|
|
sk->sk_shutdown = SHUTDOWN_MASK;
|
|
|
|
if (sk->sk_state == DCCP_LISTEN) {
|
|
dccp_set_state(sk, DCCP_CLOSED);
|
|
|
|
/* Special case. */
|
|
inet_csk_listen_stop(sk);
|
|
|
|
goto adjudge_to_death;
|
|
}
|
|
|
|
sk_stop_timer(sk, &dp->dccps_xmit_timer);
|
|
|
|
/*
|
|
* We need to flush the recv. buffs. We do this only on the
|
|
* descriptor close, not protocol-sourced closes, because the
|
|
*reader process may not have drained the data yet!
|
|
*/
|
|
while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
|
|
data_was_unread += skb->len;
|
|
__kfree_skb(skb);
|
|
}
|
|
|
|
if (data_was_unread) {
|
|
/* Unread data was tossed, send an appropriate Reset Code */
|
|
DCCP_WARN("ABORT with %u bytes unread\n", data_was_unread);
|
|
dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED);
|
|
dccp_set_state(sk, DCCP_CLOSED);
|
|
} else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
|
|
/* Check zero linger _after_ checking for unread data. */
|
|
sk->sk_prot->disconnect(sk, 0);
|
|
} else if (sk->sk_state != DCCP_CLOSED) {
|
|
/*
|
|
* Normal connection termination. May need to wait if there are
|
|
* still packets in the TX queue that are delayed by the CCID.
|
|
*/
|
|
dccp_flush_write_queue(sk, &timeout);
|
|
dccp_terminate_connection(sk);
|
|
}
|
|
|
|
/*
|
|
* Flush write queue. This may be necessary in several cases:
|
|
* - we have been closed by the peer but still have application data;
|
|
* - abortive termination (unread data or zero linger time),
|
|
* - normal termination but queue could not be flushed within time limit
|
|
*/
|
|
__skb_queue_purge(&sk->sk_write_queue);
|
|
|
|
sk_stream_wait_close(sk, timeout);
|
|
|
|
adjudge_to_death:
|
|
state = sk->sk_state;
|
|
sock_hold(sk);
|
|
sock_orphan(sk);
|
|
|
|
/*
|
|
* It is the last release_sock in its life. It will remove backlog.
|
|
*/
|
|
release_sock(sk);
|
|
/*
|
|
* Now socket is owned by kernel and we acquire BH lock
|
|
* to finish close. No need to check for user refs.
|
|
*/
|
|
local_bh_disable();
|
|
bh_lock_sock(sk);
|
|
WARN_ON(sock_owned_by_user(sk));
|
|
|
|
percpu_counter_inc(sk->sk_prot->orphan_count);
|
|
|
|
/* Have we already been destroyed by a softirq or backlog? */
|
|
if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED)
|
|
goto out;
|
|
|
|
if (sk->sk_state == DCCP_CLOSED)
|
|
inet_csk_destroy_sock(sk);
|
|
|
|
/* Otherwise, socket is reprieved until protocol close. */
|
|
|
|
out:
|
|
bh_unlock_sock(sk);
|
|
local_bh_enable();
|
|
sock_put(sk);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_close);
|
|
|
|
void dccp_shutdown(struct sock *sk, int how)
|
|
{
|
|
dccp_pr_debug("called shutdown(%x)\n", how);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_shutdown);
|
|
|
|
static inline int dccp_mib_init(void)
|
|
{
|
|
return snmp_mib_init((void __percpu **)dccp_statistics,
|
|
sizeof(struct dccp_mib),
|
|
__alignof__(struct dccp_mib));
|
|
}
|
|
|
|
static inline void dccp_mib_exit(void)
|
|
{
|
|
snmp_mib_free((void __percpu **)dccp_statistics);
|
|
}
|
|
|
|
static int thash_entries;
|
|
module_param(thash_entries, int, 0444);
|
|
MODULE_PARM_DESC(thash_entries, "Number of ehash buckets");
|
|
|
|
#ifdef CONFIG_IP_DCCP_DEBUG
|
|
int dccp_debug;
|
|
module_param(dccp_debug, bool, 0644);
|
|
MODULE_PARM_DESC(dccp_debug, "Enable debug messages");
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_debug);
|
|
#endif
|
|
|
|
static int __init dccp_init(void)
|
|
{
|
|
unsigned long goal;
|
|
int ehash_order, bhash_order, i;
|
|
int rc;
|
|
|
|
BUILD_BUG_ON(sizeof(struct dccp_skb_cb) >
|
|
FIELD_SIZEOF(struct sk_buff, cb));
|
|
rc = percpu_counter_init(&dccp_orphan_count, 0);
|
|
if (rc)
|
|
goto out_fail;
|
|
rc = -ENOBUFS;
|
|
inet_hashinfo_init(&dccp_hashinfo);
|
|
dccp_hashinfo.bind_bucket_cachep =
|
|
kmem_cache_create("dccp_bind_bucket",
|
|
sizeof(struct inet_bind_bucket), 0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!dccp_hashinfo.bind_bucket_cachep)
|
|
goto out_free_percpu;
|
|
|
|
/*
|
|
* Size and allocate the main established and bind bucket
|
|
* hash tables.
|
|
*
|
|
* The methodology is similar to that of the buffer cache.
|
|
*/
|
|
if (totalram_pages >= (128 * 1024))
|
|
goal = totalram_pages >> (21 - PAGE_SHIFT);
|
|
else
|
|
goal = totalram_pages >> (23 - PAGE_SHIFT);
|
|
|
|
if (thash_entries)
|
|
goal = (thash_entries *
|
|
sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT;
|
|
for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++)
|
|
;
|
|
do {
|
|
unsigned long hash_size = (1UL << ehash_order) * PAGE_SIZE /
|
|
sizeof(struct inet_ehash_bucket);
|
|
|
|
while (hash_size & (hash_size - 1))
|
|
hash_size--;
|
|
dccp_hashinfo.ehash_mask = hash_size - 1;
|
|
dccp_hashinfo.ehash = (struct inet_ehash_bucket *)
|
|
__get_free_pages(GFP_ATOMIC|__GFP_NOWARN, ehash_order);
|
|
} while (!dccp_hashinfo.ehash && --ehash_order > 0);
|
|
|
|
if (!dccp_hashinfo.ehash) {
|
|
DCCP_CRIT("Failed to allocate DCCP established hash table");
|
|
goto out_free_bind_bucket_cachep;
|
|
}
|
|
|
|
for (i = 0; i <= dccp_hashinfo.ehash_mask; i++) {
|
|
INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].chain, i);
|
|
INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].twchain, i);
|
|
}
|
|
|
|
if (inet_ehash_locks_alloc(&dccp_hashinfo))
|
|
goto out_free_dccp_ehash;
|
|
|
|
bhash_order = ehash_order;
|
|
|
|
do {
|
|
dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE /
|
|
sizeof(struct inet_bind_hashbucket);
|
|
if ((dccp_hashinfo.bhash_size > (64 * 1024)) &&
|
|
bhash_order > 0)
|
|
continue;
|
|
dccp_hashinfo.bhash = (struct inet_bind_hashbucket *)
|
|
__get_free_pages(GFP_ATOMIC|__GFP_NOWARN, bhash_order);
|
|
} while (!dccp_hashinfo.bhash && --bhash_order >= 0);
|
|
|
|
if (!dccp_hashinfo.bhash) {
|
|
DCCP_CRIT("Failed to allocate DCCP bind hash table");
|
|
goto out_free_dccp_locks;
|
|
}
|
|
|
|
for (i = 0; i < dccp_hashinfo.bhash_size; i++) {
|
|
spin_lock_init(&dccp_hashinfo.bhash[i].lock);
|
|
INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain);
|
|
}
|
|
|
|
rc = dccp_mib_init();
|
|
if (rc)
|
|
goto out_free_dccp_bhash;
|
|
|
|
rc = dccp_ackvec_init();
|
|
if (rc)
|
|
goto out_free_dccp_mib;
|
|
|
|
rc = dccp_sysctl_init();
|
|
if (rc)
|
|
goto out_ackvec_exit;
|
|
|
|
rc = ccid_initialize_builtins();
|
|
if (rc)
|
|
goto out_sysctl_exit;
|
|
|
|
dccp_timestamping_init();
|
|
|
|
return 0;
|
|
|
|
out_sysctl_exit:
|
|
dccp_sysctl_exit();
|
|
out_ackvec_exit:
|
|
dccp_ackvec_exit();
|
|
out_free_dccp_mib:
|
|
dccp_mib_exit();
|
|
out_free_dccp_bhash:
|
|
free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order);
|
|
out_free_dccp_locks:
|
|
inet_ehash_locks_free(&dccp_hashinfo);
|
|
out_free_dccp_ehash:
|
|
free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order);
|
|
out_free_bind_bucket_cachep:
|
|
kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
|
|
out_free_percpu:
|
|
percpu_counter_destroy(&dccp_orphan_count);
|
|
out_fail:
|
|
dccp_hashinfo.bhash = NULL;
|
|
dccp_hashinfo.ehash = NULL;
|
|
dccp_hashinfo.bind_bucket_cachep = NULL;
|
|
return rc;
|
|
}
|
|
|
|
static void __exit dccp_fini(void)
|
|
{
|
|
ccid_cleanup_builtins();
|
|
dccp_mib_exit();
|
|
free_pages((unsigned long)dccp_hashinfo.bhash,
|
|
get_order(dccp_hashinfo.bhash_size *
|
|
sizeof(struct inet_bind_hashbucket)));
|
|
free_pages((unsigned long)dccp_hashinfo.ehash,
|
|
get_order((dccp_hashinfo.ehash_mask + 1) *
|
|
sizeof(struct inet_ehash_bucket)));
|
|
inet_ehash_locks_free(&dccp_hashinfo);
|
|
kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
|
|
dccp_ackvec_exit();
|
|
dccp_sysctl_exit();
|
|
percpu_counter_destroy(&dccp_orphan_count);
|
|
}
|
|
|
|
module_init(dccp_init);
|
|
module_exit(dccp_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>");
|
|
MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol");
|