cregit-Linux how code gets into the kernel

Release 4.11 net/ipv4/inet_diag.c

Directory: net/ipv4
/*
 * inet_diag.c  Module for monitoring INET transport protocols sockets.
 *
 * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/cache.h>
#include <linux/init.h>
#include <linux/time.h>

#include <net/icmp.h>
#include <net/tcp.h>
#include <net/ipv6.h>
#include <net/inet_common.h>
#include <net/inet_connection_sock.h>
#include <net/inet_hashtables.h>
#include <net/inet_timewait_sock.h>
#include <net/inet6_hashtables.h>
#include <net/netlink.h>

#include <linux/inet.h>
#include <linux/stddef.h>

#include <linux/inet_diag.h>
#include <linux/sock_diag.h>


static const struct inet_diag_handler **inet_diag_table;


struct inet_diag_entry {
	
const __be32 *saddr;
	
const __be32 *daddr;
	
u16 sport;
	
u16 dport;
	
u16 family;
	
u16 userlocks;
	
u32 ifindex;
	
u32 mark;
};

static DEFINE_MUTEX(inet_diag_table_mutex);


static const struct inet_diag_handler *inet_diag_lock_handler(int proto) { if (!inet_diag_table[proto]) request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK, NETLINK_SOCK_DIAG, AF_INET, proto); mutex_lock(&inet_diag_table_mutex); if (!inet_diag_table[proto]) return ERR_PTR(-ENOENT); return inet_diag_table[proto]; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu5185.00%125.00%
Pavel Emelyanov915.00%375.00%
Total60100.00%4100.00%


static void inet_diag_unlock_handler(const struct inet_diag_handler *handler) { mutex_unlock(&inet_diag_table_mutex); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu18100.00%1100.00%
Total18100.00%1100.00%


void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk) { r->idiag_family = sk->sk_family; r->id.idiag_sport = htons(sk->sk_num); r->id.idiag_dport = sk->sk_dport; r->id.idiag_if = sk->sk_bound_dev_if; sock_diag_save_cookie(sk, r->id.idiag_cookie); #if IS_ENABLED(CONFIG_IPV6) if (sk->sk_family == AF_INET6) { *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr; *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr; } else #endif { memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src)); memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst)); r->id.idiag_src[0] = sk->sk_rcv_saddr; r->id.idiag_dst[0] = sk->sk_daddr; } }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet188100.00%1100.00%
Total188100.00%1100.00%

EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
static size_t inet_sk_attr_size(void) { return nla_total_size(sizeof(struct tcp_info)) + nla_total_size(1) /* INET_DIAG_SHUTDOWN */ + nla_total_size(1) /* INET_DIAG_TOS */ + nla_total_size(1) /* INET_DIAG_TCLASS */ + nla_total_size(4) /* INET_DIAG_MARK */ + nla_total_size(sizeof(struct inet_diag_meminfo)) + nla_total_size(sizeof(struct inet_diag_msg)) + nla_total_size(SK_MEMINFO_VARS * sizeof(u32)) + nla_total_size(TCP_CA_NAME_MAX) + nla_total_size(sizeof(struct tcpvegas_info)) + 64; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet8093.02%150.00%
Lorenzo Colitti66.98%150.00%
Total86100.00%2100.00%


int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb, struct inet_diag_msg *r, int ext, struct user_namespace *user_ns, bool net_admin) { const struct inet_sock *inet = inet_sk(sk); if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown)) goto errout; /* IPv6 dual-stack sockets use inet->tos for IPv4 connections, * hence this needs to be included regardless of socket family. */ if (ext & (1 << (INET_DIAG_TOS - 1))) if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0) goto errout; #if IS_ENABLED(CONFIG_IPV6) if (r->idiag_family == AF_INET6) { if (ext & (1 << (INET_DIAG_TCLASS - 1))) if (nla_put_u8(skb, INET_DIAG_TCLASS, inet6_sk(sk)->tclass) < 0) goto errout; if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk))) goto errout; } #endif if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark)) goto errout; r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); r->idiag_inode = sock_i_ino(sk); return 0; errout: return 1; }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Emelyanov3615.93%313.04%
Phil Sutter3314.60%28.70%
Maciej Żenczykowski2611.50%28.70%
Lorenzo Colitti219.29%14.35%
Murali Raja208.85%14.35%
Thomas Graf187.96%14.35%
Stephen Hemminger177.52%14.35%
Xin Long156.64%14.35%
Arnaldo Carvalho de Melo125.31%521.74%
Eric W. Biedermann93.98%14.35%
David S. Miller93.98%28.70%
Eric Dumazet52.21%28.70%
Linus Torvalds52.21%14.35%
Total226100.00%23100.00%

EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, struct sk_buff *skb, const struct inet_diag_req_v2 *req, struct user_namespace *user_ns, u32 portid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh, bool net_admin) { const struct tcp_congestion_ops *ca_ops; const struct inet_diag_handler *handler; int ext = req->idiag_ext; struct inet_diag_msg *r; struct nlmsghdr *nlh; struct nlattr *attr; void *info = NULL; handler = inet_diag_table[req->sdiag_protocol]; BUG_ON(!handler); nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), nlmsg_flags); if (!nlh) return -EMSGSIZE; r = nlmsg_data(nlh); BUG_ON(!sk_fullsock(sk)); inet_diag_msg_common_fill(r, sk); r->idiag_state = sk->sk_state; r->idiag_timer = 0; r->idiag_retrans = 0; if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin)) goto errout; if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { struct inet_diag_meminfo minfo = { .idiag_rmem = sk_rmem_alloc_get(sk), .idiag_wmem = sk->sk_wmem_queued, .idiag_fmem = sk->sk_forward_alloc, .idiag_tmem = sk_wmem_alloc_get(sk), }; if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0) goto errout; } if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) goto errout; /* * RAW sockets might have user-defined protocols assigned, * so report the one supplied on socket creation. */ if (sk->sk_type == SOCK_RAW) { if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol)) goto errout; } if (!icsk) { handler->idiag_get_info(sk, r, NULL); goto out; } if (icsk->icsk_pending == ICSK_TIME_RETRANS || icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT || icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { r->idiag_timer = 1; r->idiag_retrans = icsk->icsk_retransmits; r->idiag_expires = jiffies_to_msecs(icsk->icsk_timeout - jiffies); } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { r->idiag_timer = 4; r->idiag_retrans = icsk->icsk_probes_out; r->idiag_expires = jiffies_to_msecs(icsk->icsk_timeout - jiffies); } else if (timer_pending(&sk->sk_timer)) { r->idiag_timer = 2; r->idiag_retrans = icsk->icsk_probes_out; r->idiag_expires = jiffies_to_msecs(sk->sk_timer.expires - jiffies); } else { r->idiag_timer = 0; r->idiag_expires = 0; } if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) { attr = nla_reserve_64bit(skb, INET_DIAG_INFO, handler->idiag_info_size, INET_DIAG_PAD); if (!attr) goto errout; info = nla_data(attr); } if (ext & (1 << (INET_DIAG_CONG - 1))) { int err = 0; rcu_read_lock(); ca_ops = READ_ONCE(icsk->icsk_ca_ops); if (ca_ops) err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name); rcu_read_unlock(); if (err < 0) goto errout; } handler->idiag_get_info(sk, r, info); if (sk->sk_state < TCP_TIME_WAIT) { union tcp_cc_info info; size_t sz = 0; int attr; rcu_read_lock(); ca_ops = READ_ONCE(icsk->icsk_ca_ops); if (ca_ops && ca_ops->get_info) sz = ca_ops->get_info(sk, ext, &attr, &info); rcu_read_unlock(); if (sz && nla_put(skb, attr, sz, &info) < 0) goto errout; } out: nlmsg_end(skb, nlh); return 0; errout: nlmsg_cancel(skb, nlh); return -EMSGSIZE; }

Contributors

PersonTokensPropCommitsCommitProp
Xin Long20227.82%26.90%
Pavel Emelyanov10714.74%26.90%
Eric Dumazet9012.40%310.34%
Stephen Hemminger8912.26%517.24%
Thomas Graf8011.02%13.45%
Linus Torvalds496.75%13.45%
Arnaldo Carvalho de Melo415.65%620.69%
Cyrill V. Gorcunov273.72%13.45%
Craig Gallek91.24%13.45%
Shan Wei81.10%13.45%
Nandita Dukkipati60.83%13.45%
Yuchung Cheng60.83%13.45%
Lorenzo Colitti50.69%13.45%
Johannes Berg30.41%13.45%
Nicolas Dichtel30.41%13.45%
Patrick McHardy10.14%13.45%
Total726100.00%29100.00%

EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
static int inet_csk_diag_fill(struct sock *sk, struct sk_buff *skb, const struct inet_diag_req_v2 *req, struct user_namespace *user_ns, u32 portid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh, bool net_admin) { return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns, portid, seq, nlmsg_flags, unlh, net_admin); }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Emelyanov5779.17%233.33%
Eric W. Biedermann912.50%233.33%
Lorenzo Colitti56.94%116.67%
Eric Dumazet11.39%116.67%
Total72100.00%6100.00%


static int inet_twsk_diag_fill(struct sock *sk, struct sk_buff *skb, u32 portid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh) { struct inet_timewait_sock *tw = inet_twsk(sk); struct inet_diag_msg *r; struct nlmsghdr *nlh; long tmo; nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), nlmsg_flags); if (!nlh) return -EMSGSIZE; r = nlmsg_data(nlh); BUG_ON(tw->tw_state != TCP_TIME_WAIT); tmo = tw->tw_timer.expires - jiffies; if (tmo < 0) tmo = 0; inet_diag_msg_common_fill(r, sk); r->idiag_retrans = 0; r->idiag_state = tw->tw_substate; r->idiag_timer = 3; r->idiag_expires = jiffies_to_msecs(tmo); r->idiag_rqueue = 0; r->idiag_wqueue = 0; r->idiag_uid = 0; r->idiag_inode = 0; nlmsg_end(skb, nlh); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo12464.58%214.29%
Eric Dumazet2814.58%535.71%
David S. Miller126.25%17.14%
Thomas Graf84.17%17.14%
Linus Torvalds84.17%17.14%
Daniel Borkmann52.60%17.14%
Johannes Berg31.56%17.14%
Ilpo Järvinen21.04%17.14%
Eric W. Biedermann21.04%17.14%
Total192100.00%14100.00%


static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb, u32 portid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh, bool net_admin) { struct request_sock *reqsk = inet_reqsk(sk); struct inet_diag_msg *r; struct nlmsghdr *nlh; long tmo; nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), nlmsg_flags); if (!nlh) return -EMSGSIZE; r = nlmsg_data(nlh); inet_diag_msg_common_fill(r, sk); r->idiag_state = TCP_SYN_RECV; r->idiag_timer = 1; r->idiag_retrans = reqsk->num_retrans; BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) != offsetof(struct sock, sk_cookie)); tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies; r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0; r->idiag_rqueue = 0; r->idiag_wqueue = 0; r->idiag_uid = 0; r->idiag_inode = 0; if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, inet_rsk(reqsk)->ir_mark)) return -EMSGSIZE; nlmsg_end(skb, nlh); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet19284.21%266.67%
Lorenzo Colitti3615.79%133.33%
Total228100.00%3100.00%


static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, const struct inet_diag_req_v2 *r, struct user_namespace *user_ns, u32 portid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh, bool net_admin) { if (sk->sk_state == TCP_TIME_WAIT) return inet_twsk_diag_fill(sk, skb, portid, seq, nlmsg_flags, unlh); if (sk->sk_state == TCP_NEW_SYN_RECV) return inet_req_diag_fill(sk, skb, portid, seq, nlmsg_flags, unlh, net_admin); return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, nlmsg_flags, unlh, net_admin); }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo7160.68%112.50%
Eric Dumazet2420.51%225.00%
Eric W. Biedermann108.55%225.00%
Lorenzo Colitti75.98%112.50%
Pavel Emelyanov54.27%225.00%
Total117100.00%8100.00%


struct sock *inet_diag_find_one_icsk(struct net *net, struct inet_hashinfo *hashinfo, const struct inet_diag_req_v2 *req) { struct sock *sk; rcu_read_lock(); if (req->sdiag_family == AF_INET) sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0], req->id.idiag_dport, req->id.idiag_src[0], req->id.idiag_sport, req->id.idiag_if); #if IS_ENABLED(CONFIG_IPV6) else if (req->sdiag_family == AF_INET6) { if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) && ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src)) sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3], req->id.idiag_dport, req->id.idiag_src[3], req->id.idiag_sport, req->id.idiag_if); else sk = inet6_lookup(net, hashinfo, NULL, 0, (struct in6_addr *)req->id.idiag_dst, req->id.idiag_dport, (struct in6_addr *)req->id.idiag_src, req->id.idiag_sport, req->id.idiag_if); } #endif else { rcu_read_unlock(); return ERR_PTR(-EINVAL); } rcu_read_unlock(); if (!sk) return ERR_PTR(-ENOENT); if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) { sock_gen_put(sk); return ERR_PTR(-ENOENT); } return sk; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds9531.88%14.17%
Eric Dumazet9431.54%520.83%
Lorenzo Colitti4113.76%14.17%
Arnaldo Carvalho de Melo299.73%520.83%
Pavel Emelyanov186.04%729.17%
Craig Gallek124.03%14.17%
David S. Miller41.34%28.33%
Andrey Vagin41.34%14.17%
Herbert Xu10.34%14.17%
Total298100.00%24100.00%

EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb, const struct nlmsghdr *nlh, const struct inet_diag_req_v2 *req) { struct net *net = sock_net(in_skb->sk); struct sk_buff *rep; struct sock *sk; int err; sk = inet_diag_find_one_icsk(net, hashinfo, req); if (IS_ERR(sk)) return PTR_ERR(sk); rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL); if (!rep) { err = -ENOMEM; goto out; } err = sk_diag_fill(sk, rep, req, sk_user_ns(NETLINK_CB(in_skb).sk), NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, 0, nlh, netlink_net_capable(in_skb, CAP_NET_ADMIN)); if (err < 0) { WARN_ON(err == -EMSGSIZE); nlmsg_free(rep); goto out; } err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, MSG_DONTWAIT); if (err > 0) err = 0; out: if (sk) sock_gen_put(sk); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Lorenzo Colitti7836.79%212.50%
Linus Torvalds7033.02%16.25%
Patrick McHardy2411.32%212.50%
Eric W. Biedermann115.19%212.50%
Thomas Graf94.25%16.25%
Pavel Emelyanov73.30%212.50%
Arnaldo Carvalho de Melo52.36%212.50%
Andrey Vagin31.42%16.25%
Eric Dumazet31.42%212.50%
Harald Welte20.94%16.25%
Total212100.00%16100.00%

EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb, const struct nlmsghdr *nlh, const struct inet_diag_req_v2 *req) { const struct inet_diag_handler *handler; int err; handler = inet_diag_lock_handler(req->sdiag_protocol); if (IS_ERR(handler)) err = PTR_ERR(handler); else if (cmd == SOCK_DIAG_BY_FAMILY) err = handler->dump_one(in_skb, nlh, req); else if (cmd == SOCK_DESTROY && handler->destroy) err = handler->destroy(in_skb, req); else err = -EOPNOTSUPP; inet_diag_unlock_handler(handler); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Emelyanov6557.02%342.86%
Lorenzo Colitti3934.21%114.29%
Herbert Xu54.39%114.29%
Linus Torvalds43.51%114.29%
Eric Dumazet10.88%114.29%
Total114100.00%7100.00%


static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) { int words = bits >> 5; bits &= 0x1f; if (words) { if (memcmp(a1, a2, words << 2)) return 0; } if (bits) { __be32 w1, w2; __be32 mask; w1 = a1[words]; w2 = a2[words]; mask = htonl((0xffffffff) << (32 - bits)); if ((w1 ^ w2) & mask) return 0; } return 1; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds10493.69%133.33%
Al Viro43.60%133.33%
Stephen Hemminger32.70%133.33%
Total111100.00%3100.00%


static int inet_diag_bc_run(const struct nlattr *_bc, const struct inet_diag_entry *entry) { const void *bc = nla_data(_bc); int len = nla_len(_bc); while (len > 0) { int yes = 1; const struct inet_diag_bc_op *op = bc; switch (op->code) { case INET_DIAG_BC_NOP: break; case INET_DIAG_BC_JMP: yes = 0; break; case INET_DIAG_BC_S_GE: yes = entry->sport >= op[1].no; break; case INET_DIAG_BC_S_LE: yes = entry->sport <= op[1].no; break; case INET_DIAG_BC_D_GE: yes = entry->dport >= op[1].no; break; case INET_DIAG_BC_D_LE: yes = entry->dport <= op[1].no; break; case INET_DIAG_BC_AUTO: yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); break; case INET_DIAG_BC_S_COND: case INET_DIAG_BC_D_COND: { const struct inet_diag_hostcond *cond; const __be32 *addr; cond = (const struct inet_diag_hostcond *)(op + 1); if (cond->port !=