cregit-Linux how code gets into the kernel

Release 4.8 net/dccp/proto.c

Directory: net/dccp
/*
 *  net/dccp/proto.c
 *
 *  An implementation of the DCCP protocol
 *  Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *
 *      This program is free software; you can redistribute it and/or modify it
 *      under the terms of the GNU General Public License version 2 as
 *      published by the Free Software Foundation.
 */

#include <linux/dccp.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/in.h>
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <net/checksum.h>

#include <net/inet_sock.h>
#include <net/sock.h>
#include <net/xfrm.h>

#include <asm/ioctls.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/poll.h>

#include "ccid.h"
#include "dccp.h"
#include "feat.h"

DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly;


EXPORT_SYMBOL_GPL(dccp_statistics);


struct percpu_counter dccp_orphan_count;

EXPORT_SYMBOL_GPL(dccp_orphan_count);


struct inet_hashinfo dccp_hashinfo;

EXPORT_SYMBOL_GPL(dccp_hashinfo);

/* the maximum queue length for tx in packets. 0 is no limit */

int sysctl_dccp_tx_qlen __read_mostly = 5;

#ifdef CONFIG_IP_DCCP_DEBUG

static const char *dccp_state_name(const int state) { static const char *const dccp_state_names[] = { [DCCP_OPEN] = "OPEN", [DCCP_REQUESTING] = "REQUESTING", [DCCP_PARTOPEN] = "PARTOPEN", [DCCP_LISTEN] = "LISTEN", [DCCP_RESPOND] = "RESPOND", [DCCP_CLOSING] = "CLOSING", [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ", [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE", [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ", [DCCP_TIME_WAIT] = "TIME_WAIT", [DCCP_CLOSED] = "CLOSED", }; if (state >= DCCP_MAX_STATES) return "INVALID STATE!"; else return dccp_state_names[state]; }

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Total104100.00%1100.00%

#endif
void dccp_set_state(struct sock *sk, const int state) { const int oldstate = sk->sk_state; dccp_pr_debug("%s(%p) %s --> %s\n", dccp_role(sk), sk, dccp_state_name(oldstate), dccp_state_name(state)); WARN_ON(state == oldstate); switch (state) { case DCCP_OPEN: if (oldstate != DCCP_OPEN) DCCP_INC_STATS(DCCP_MIB_CURRESTAB); /* Client retransmits all Confirm options until entering OPEN */ if (oldstate == DCCP_PARTOPEN) dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg); break; case DCCP_CLOSED: if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ || oldstate == DCCP_CLOSING) DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); sk->sk_prot->unhash(sk); if (inet_csk(sk)->icsk_bind_hash != NULL && !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) inet_put_port(sk); /* fall through */ default: if (oldstate == DCCP_OPEN) DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); } /* Change state AFTER socket is unhashed to avoid closed * socket sitting in hash tables. */ sk->sk_state = state; }

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gerrit renkergerrit renker2515.06%375.00%
Total166100.00%4100.00%

EXPORT_SYMBOL_GPL(dccp_set_state);
static void dccp_finish_passive_close(struct sock *sk) { switch (sk->sk_state) { case DCCP_PASSIVE_CLOSE: /* Node (client or server) has received Close packet. */ dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED); dccp_set_state(sk, DCCP_CLOSED); break; case DCCP_PASSIVE_CLOSEREQ: /* * Client received CloseReq. We set the `active' flag so that * dccp_send_close() retransmits the Close as per RFC 4340, 8.3. */ dccp_send_close(sk, 1); dccp_set_state(sk, DCCP_CLOSING); } }

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Total56100.00%1100.00%


void dccp_done(struct sock *sk) { dccp_set_state(sk, DCCP_CLOSED); dccp_clear_xmit_timers(sk); sk->sk_shutdown = SHUTDOWN_MASK; if (!sock_flag(sk, SOCK_DEAD)) sk->sk_state_change(sk); else inet_csk_destroy_sock(sk); }

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EXPORT_SYMBOL_GPL(dccp_done);
const char *dccp_packet_name(const int type) { static const char *const dccp_packet_names[] = { [DCCP_PKT_REQUEST] = "REQUEST", [DCCP_PKT_RESPONSE] = "RESPONSE", [DCCP_PKT_DATA] = "DATA", [DCCP_PKT_ACK] = "ACK", [DCCP_PKT_DATAACK] = "DATAACK", [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", [DCCP_PKT_CLOSE] = "CLOSE", [DCCP_PKT_RESET] = "RESET", [DCCP_PKT_SYNC] = "SYNC", [DCCP_PKT_SYNCACK] = "SYNCACK", }; if (type >= DCCP_NR_PKT_TYPES) return "INVALID"; else return dccp_packet_names[type]; }

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arnaldo carvalho de meloarnaldo carvalho de melo9698.97%150.00%
jan engelhardtjan engelhardt11.03%150.00%
Total97100.00%2100.00%

EXPORT_SYMBOL_GPL(dccp_packet_name);
int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized) { struct dccp_sock *dp = dccp_sk(sk); struct inet_connection_sock *icsk = inet_csk(sk); icsk->icsk_rto = DCCP_TIMEOUT_INIT; icsk->icsk_syn_retries = sysctl_dccp_request_retries; sk->sk_state = DCCP_CLOSED; sk->sk_write_space = dccp_write_space; icsk->icsk_sync_mss = dccp_sync_mss; dp->dccps_mss_cache = 536; dp->dccps_rate_last = jiffies; dp->dccps_role = DCCP_ROLE_UNDEFINED; dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; dp->dccps_tx_qlen = sysctl_dccp_tx_qlen; dccp_init_xmit_timers(sk); INIT_LIST_HEAD(&dp->dccps_featneg); /* control socket doesn't need feat nego */ if (likely(ctl_sock_initialized)) return dccp_feat_init(sk); return 0; }

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arnaldo carvalho de meloarnaldo carvalho de melo9677.42%333.33%
gerrit renkergerrit renker2217.74%444.44%
tomasz grobelnytomasz grobelny64.84%222.22%
Total124100.00%9100.00%

EXPORT_SYMBOL_GPL(dccp_init_sock);
void dccp_destroy_sock(struct sock *sk) { struct dccp_sock *dp = dccp_sk(sk); /* * DCCP doesn't use sk_write_queue, just sk_send_head * for retransmissions */ if (sk->sk_send_head != NULL) { kfree_skb(sk->sk_send_head); sk->sk_send_head = NULL; } /* Clean up a referenced DCCP bind bucket. */ if (inet_csk(sk)->icsk_bind_hash != NULL) inet_put_port(sk); kfree(dp->dccps_service_list); dp->dccps_service_list = NULL; if (dp->dccps_hc_rx_ackvec != NULL) { dccp_ackvec_free(dp->dccps_hc_rx_ackvec); dp->dccps_hc_rx_ackvec = NULL; } ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; /* clean up feature negotiation state */ dccp_feat_list_purge(&dp->dccps_featneg); }

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arnaldo carvalho de meloarnaldo carvalho de melo12492.54%125.00%
gerrit renkergerrit renker96.72%250.00%
brian haleybrian haley10.75%125.00%
Total134100.00%4100.00%

EXPORT_SYMBOL_GPL(dccp_destroy_sock);
static inline int dccp_listen_start(struct sock *sk, int backlog) { struct dccp_sock *dp = dccp_sk(sk); dp->dccps_role = DCCP_ROLE_LISTEN; /* do not start to listen if feature negotiation setup fails */ if (dccp_feat_finalise_settings(dp)) return -EPROTO; return inet_csk_listen_start(sk, backlog); }

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arnaldo carvalho de meloarnaldo carvalho de melo3568.63%250.00%
gerrit renkergerrit renker1223.53%125.00%
eric dumazeteric dumazet47.84%125.00%
Total51100.00%4100.00%


static inline int dccp_need_reset(int state) { return state != DCCP_CLOSED && state != DCCP_LISTEN && state != DCCP_REQUESTING; }

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Total23100.00%1100.00%


int dccp_disconnect(struct sock *sk, int flags) { struct inet_connection_sock *icsk = inet_csk(sk); struct inet_sock *inet = inet_sk(sk); int err = 0; const int old_state = sk->sk_state; if (old_state != DCCP_CLOSED) dccp_set_state(sk, DCCP_CLOSED); /* * This corresponds to the ABORT function of RFC793, sec. 3.8 * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". */ if (old_state == DCCP_LISTEN) { inet_csk_listen_stop(sk); } else if (dccp_need_reset(old_state)) { dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); sk->sk_err = ECONNRESET; } else if (old_state == DCCP_REQUESTING) sk->sk_err = ECONNRESET; dccp_clear_xmit_timers(sk); __skb_queue_purge(&sk->sk_receive_queue); __skb_queue_purge(&sk->sk_write_queue); if (sk->sk_send_head != NULL) { __kfree_skb(sk->sk_send_head); sk->sk_send_head = NULL; } inet->inet_dport = 0; if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) inet_reset_saddr(sk); sk->sk_shutdown = 0; sock_reset_flag(sk, SOCK_DONE); icsk->icsk_backoff = 0; inet_csk_delack_init(sk); __sk_dst_reset(sk); WARN_ON(inet->inet_num && !icsk->icsk_bind_hash); sk->sk_error_report(sk); return err; }

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arnaldo carvalho de meloarnaldo carvalho de melo18983.63%120.00%
gerrit renkergerrit renker3214.16%240.00%
ilpo jarvinenilpo jarvinen31.33%120.00%
eric dumazeteric dumazet20.88%120.00%
Total226100.00%5100.00%

EXPORT_SYMBOL_GPL(dccp_disconnect); /* * Wait for a DCCP event. * * Note that we don't need to lock the socket, as the upper poll layers * take care of normal races (between the test and the event) and we don't * go look at any of the socket buffers directly. */
unsigned int dccp_poll(struct file *file, struct socket *sock, poll_table *wait) { unsigned int mask; struct sock *sk = sock->sk; sock_poll_wait(file, sk_sleep(sk), wait); if (sk->sk_state == DCCP_LISTEN) return inet_csk_listen_poll(sk); /* Socket is not locked. We are protected from async events by poll logic and correct handling of state changes made by another threads is impossible in any case. */ mask = 0; if (sk->sk_err) mask = POLLERR; if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) mask |= POLLHUP; if (sk->sk_shutdown & RCV_SHUTDOWN) mask |= POLLIN | POLLRDNORM | POLLRDHUP; /* Connected? */ if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { if (atomic_read(&sk->sk_rmem_alloc) > 0) mask |= POLLIN | POLLRDNORM; if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { if (sk_stream_is_writeable(sk)) { mask |= POLLOUT | POLLWRNORM; } else { /* send SIGIO later */ sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); /* Race breaker. If space is freed after * wspace test but before the flags are set, * IO signal will be lost. */ if (sk_stream_is_writeable(sk)) mask |= POLLOUT | POLLWRNORM; } } } return mask; }

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arnaldo carvalho de meloarnaldo carvalho de melo20495.33%116.67%
eric dumazeteric dumazet73.27%350.00%
davide libenzidavide libenzi20.93%116.67%
jiri olsajiri olsa10.47%116.67%
Total214100.00%6100.00%

EXPORT_SYMBOL_GPL(dccp_poll);
int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) { int rc = -ENOTCONN; lock_sock(sk); if (sk->sk_state == DCCP_LISTEN) goto out; switch (cmd) { case SIOCINQ: { struct sk_buff *skb; unsigned long amount = 0; skb = skb_peek(&sk->sk_receive_queue); if (skb != NULL) { /* * We will only return the amount of this packet since * that is all that will be read. */ amount = skb->len; } rc = put_user(amount, (int __user *)arg); } break; default: rc = -ENOIOCTLCMD; break; } out: release_sock(sk); return rc; }

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arnaldo carvalho de meloarnaldo carvalho de melo118100.00%2100.00%
Total118100.00%2100.00%

EXPORT_SYMBOL_GPL(dccp_ioctl);
static int dccp_setsockopt_service(struct sock *sk, const __be32 service, char __user *optval, unsigned int optlen) { struct dccp_sock *dp = dccp_sk(sk); struct dccp_service_list *sl = NULL; if (service == DCCP_SERVICE_INVALID_VALUE || optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) return -EINVAL; if (optlen > sizeof(service)) { sl = kmalloc(optlen, GFP_KERNEL); if (sl == NULL) return -ENOMEM; sl->dccpsl_nr = optlen / sizeof(u32) - 1; if (copy_from_user(sl->dccpsl_list, optval + sizeof(service), optlen - sizeof(service)) || dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { kfree(sl); return -EFAULT; } } lock_sock(sk); dp->dccps_service = service; kfree(dp->dccps_service_list); dp->dccps_service_list = sl; release_sock(sk); return 0; }

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arnaldo carvalho de meloarnaldo carvalho de melo17498.86%133.33%
david s. millerdavid s. miller10.57%133.33%
andrea bittauandrea bittau10.57%133.33%
Total176100.00%3100.00%


static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx) { u8 *list, len; int i, rc; if (cscov < 0 || cscov > 15) return -EINVAL; /* * Populate a list of permissible values, in the range cscov...15. This * is necessary since feature negotiation of single values only works if * both sides incidentally choose the same value. Since the list starts * lowest-value first, negotiation will pick the smallest shared value. */ if (cscov == 0) return 0; len = 16 - cscov; list = kmalloc(len, GFP_KERNEL); if (list == NULL) return -ENOBUFS; for (i = 0; i < len; i++) list[i] = cscov++; rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len); if (rc == 0) { if (rx) dccp_sk(sk)->dccps_pcrlen = cscov; else dccp_sk(sk)->dccps_pcslen = cscov; } kfree(list); return rc; }

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Total152100.00%1100.00%


static int dccp_setsockopt_ccid(struct sock *sk, int type, char __user *optval, unsigned int optlen) { u8 *val; int rc = 0; if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS) return -EINVAL; val = memdup_user(optval, optlen); if (IS_ERR(val)) return PTR_ERR(val); lock_sock(sk); if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID) rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen); 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; }

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gerrit renkergerrit renker13495.04%133.33%
julia lawalljulia lawall64.26%133.33%
david s. millerdavid s. miller10.71%133.33%
Total141100.00%3100.00%


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; }

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gerrit renkergerrit renker10736.52%642.86%
arnaldo carvalho de meloarnaldo carvalho de melo10736.52%428.57%
tomasz grobelnytomasz grobelny7625.94%214.29%
dmitry mishindmitry mishin20.68%17.14%
david s. millerdavid s. miller10.34%17.14%
Total293100.00%14100.00%


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); }

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dmitry mishindmitry mishin6598.48%150.00%
david s. millerdavid s. miller11.52%150.00%
Total66100.00%2100.00%

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); }

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dmitry mishindmitry mishin5796.61%133.33%
david s. millerdavid s. miller11.69%133.33%
arnaldo carvalho de meloarnaldo carvalho de melo11.69%133.33%
Total59100.00%3100.00%

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; }

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arnaldo carvalho de meloarnaldo carvalho de melo16199.38%150.00%
andrea bittauandrea bittau10.62%150.00%
Total162100.00%2100.00%


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)