12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 26d0bfe22SLorenzo Colitti /* 36d0bfe22SLorenzo Colitti * INET An implementation of the TCP/IP protocol suite for the LINUX 46d0bfe22SLorenzo Colitti * operating system. INET is implemented using the BSD Socket 56d0bfe22SLorenzo Colitti * interface as the means of communication with the user level. 66d0bfe22SLorenzo Colitti * 76d0bfe22SLorenzo Colitti * "Ping" sockets 86d0bfe22SLorenzo Colitti * 96d0bfe22SLorenzo Colitti * Based on ipv4/ping.c code. 106d0bfe22SLorenzo Colitti * 116d0bfe22SLorenzo Colitti * Authors: Lorenzo Colitti (IPv6 support) 126d0bfe22SLorenzo Colitti * Vasiliy Kulikov / Openwall (IPv4 implementation, for Linux 2.6), 136d0bfe22SLorenzo Colitti * Pavel Kankovsky (IPv4 implementation, for Linux 2.4.32) 146d0bfe22SLorenzo Colitti */ 156d0bfe22SLorenzo Colitti 166d0bfe22SLorenzo Colitti #include <net/addrconf.h> 176d0bfe22SLorenzo Colitti #include <net/ipv6.h> 186d0bfe22SLorenzo Colitti #include <net/ip6_route.h> 196d0bfe22SLorenzo Colitti #include <net/protocol.h> 206d0bfe22SLorenzo Colitti #include <net/udp.h> 216d0bfe22SLorenzo Colitti #include <net/transp_v6.h> 22f4550221SChristoph Hellwig #include <linux/proc_fs.h> 230ffe2412SYiFei Zhu #include <linux/bpf-cgroup.h> 246d0bfe22SLorenzo Colitti #include <net/ping.h> 256d0bfe22SLorenzo Colitti 266d0bfe22SLorenzo Colitti /* Compatibility glue so we can support IPv6 when it's compiled as a module */ 2785fbaa75SHannes Frederic Sowa static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, 2885fbaa75SHannes Frederic Sowa int *addr_len) 296d0bfe22SLorenzo Colitti { 306d0bfe22SLorenzo Colitti return -EAFNOSUPPORT; 316d0bfe22SLorenzo Colitti } 324b261c75SHannes Frederic Sowa static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 336d0bfe22SLorenzo Colitti struct sk_buff *skb) 346d0bfe22SLorenzo Colitti { 356d0bfe22SLorenzo Colitti } 36a06a2d37SWu Fengguang static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err) 376d0bfe22SLorenzo Colitti { 386d0bfe22SLorenzo Colitti return -EAFNOSUPPORT; 396d0bfe22SLorenzo Colitti } 40a06a2d37SWu Fengguang static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 416d0bfe22SLorenzo Colitti __be16 port, u32 info, u8 *payload) {} 42a06a2d37SWu Fengguang static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 436bc19fb8SDavid S. Miller const struct net_device *dev, int strict) 446d0bfe22SLorenzo Colitti { 456d0bfe22SLorenzo Colitti return 0; 466d0bfe22SLorenzo Colitti } 476d0bfe22SLorenzo Colitti 480ffe2412SYiFei Zhu static int ping_v6_pre_connect(struct sock *sk, struct sockaddr *uaddr, 490ffe2412SYiFei Zhu int addr_len) 500ffe2412SYiFei Zhu { 510ffe2412SYiFei Zhu /* This check is replicated from __ip6_datagram_connect() and 520ffe2412SYiFei Zhu * intended to prevent BPF program called below from accessing 530ffe2412SYiFei Zhu * bytes that are out of the bound specified by user in addr_len. 540ffe2412SYiFei Zhu */ 550ffe2412SYiFei Zhu 560ffe2412SYiFei Zhu if (addr_len < SIN6_LEN_RFC2133) 570ffe2412SYiFei Zhu return -EINVAL; 580ffe2412SYiFei Zhu 590ffe2412SYiFei Zhu return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr); 600ffe2412SYiFei Zhu } 610ffe2412SYiFei Zhu 626579a023SHaishuang Yan static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 636d0bfe22SLorenzo Colitti { 646d0bfe22SLorenzo Colitti struct inet_sock *inet = inet_sk(sk); 656d0bfe22SLorenzo Colitti struct ipv6_pinfo *np = inet6_sk(sk); 666d0bfe22SLorenzo Colitti struct icmp6hdr user_icmph; 676d0bfe22SLorenzo Colitti int addr_type; 686d0bfe22SLorenzo Colitti struct in6_addr *daddr; 695e457896SLorenzo Colitti int oif = 0; 706d0bfe22SLorenzo Colitti struct flowi6 fl6; 716d0bfe22SLorenzo Colitti int err; 726d0bfe22SLorenzo Colitti struct dst_entry *dst; 736d0bfe22SLorenzo Colitti struct rt6_info *rt; 746d0bfe22SLorenzo Colitti struct pingfakehdr pfh; 7526879da5SWei Wang struct ipcm6_cookie ipc6; 766d0bfe22SLorenzo Colitti 776d0bfe22SLorenzo Colitti err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph, 786d0bfe22SLorenzo Colitti sizeof(user_icmph)); 796d0bfe22SLorenzo Colitti if (err) 806d0bfe22SLorenzo Colitti return err; 816d0bfe22SLorenzo Colitti 8216576a03SAlan Brady memset(&fl6, 0, sizeof(fl6)); 8316576a03SAlan Brady 846d0bfe22SLorenzo Colitti if (msg->msg_name) { 85342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name); 869145736dSLorenzo Colitti if (msg->msg_namelen < sizeof(*u)) 876d0bfe22SLorenzo Colitti return -EINVAL; 889145736dSLorenzo Colitti if (u->sin6_family != AF_INET6) { 899145736dSLorenzo Colitti return -EAFNOSUPPORT; 906d0bfe22SLorenzo Colitti } 916d0bfe22SLorenzo Colitti daddr = &(u->sin6_addr); 9216576a03SAlan Brady if (np->sndflow) 9316576a03SAlan Brady fl6.flowlabel = u->sin6_flowinfo & IPV6_FLOWINFO_MASK; 945e457896SLorenzo Colitti if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr))) 955e457896SLorenzo Colitti oif = u->sin6_scope_id; 966d0bfe22SLorenzo Colitti } else { 976d0bfe22SLorenzo Colitti if (sk->sk_state != TCP_ESTABLISHED) 986d0bfe22SLorenzo Colitti return -EDESTADDRREQ; 99efe4208fSEric Dumazet daddr = &sk->sk_v6_daddr; 10016576a03SAlan Brady fl6.flowlabel = np->flow_label; 1016d0bfe22SLorenzo Colitti } 1026d0bfe22SLorenzo Colitti 1035e457896SLorenzo Colitti if (!oif) 1045e457896SLorenzo Colitti oif = sk->sk_bound_dev_if; 1055e457896SLorenzo Colitti 1065e457896SLorenzo Colitti if (!oif) 1075e457896SLorenzo Colitti oif = np->sticky_pktinfo.ipi6_ifindex; 1085e457896SLorenzo Colitti 1095e457896SLorenzo Colitti if (!oif && ipv6_addr_is_multicast(daddr)) 1105e457896SLorenzo Colitti oif = np->mcast_oif; 1115e457896SLorenzo Colitti else if (!oif) 1125e457896SLorenzo Colitti oif = np->ucast_oif; 1136d0bfe22SLorenzo Colitti 1146d0bfe22SLorenzo Colitti addr_type = ipv6_addr_type(daddr); 1155e457896SLorenzo Colitti if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) || 1165e457896SLorenzo Colitti (addr_type & IPV6_ADDR_MAPPED) || 1175e457896SLorenzo Colitti (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if)) 1186d0bfe22SLorenzo Colitti return -EINVAL; 1196d0bfe22SLorenzo Colitti 1203ebb0b10SJakub Kicinski ipcm6_init_sk(&ipc6, np); 1213ebb0b10SJakub Kicinski ipc6.sockc.tsflags = sk->sk_tsflags; 1223ebb0b10SJakub Kicinski ipc6.sockc.mark = sk->sk_mark; 1233ebb0b10SJakub Kicinski 124e6652a8eSAya Levin fl6.flowi6_oif = oif; 125e6652a8eSAya Levin 12613651224SJakub Kicinski if (msg->msg_controllen) { 12713651224SJakub Kicinski struct ipv6_txoptions opt = {}; 12813651224SJakub Kicinski 12913651224SJakub Kicinski opt.tot_len = sizeof(opt); 13013651224SJakub Kicinski ipc6.opt = &opt; 13113651224SJakub Kicinski 13213651224SJakub Kicinski err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6); 13313651224SJakub Kicinski if (err < 0) 1343ebb0b10SJakub Kicinski return err; 1353ebb0b10SJakub Kicinski 13613651224SJakub Kicinski /* Changes to txoptions and flow info are not implemented, yet. 137e6652a8eSAya Levin * Drop the options. 13813651224SJakub Kicinski */ 13913651224SJakub Kicinski ipc6.opt = NULL; 14013651224SJakub Kicinski } 1416d0bfe22SLorenzo Colitti 1426d0bfe22SLorenzo Colitti fl6.flowi6_proto = IPPROTO_ICMPV6; 1436d0bfe22SLorenzo Colitti fl6.saddr = np->saddr; 1446d0bfe22SLorenzo Colitti fl6.daddr = *daddr; 1453ebb0b10SJakub Kicinski fl6.flowi6_mark = ipc6.sockc.mark; 146e2d118a1SLorenzo Colitti fl6.flowi6_uid = sk->sk_uid; 1476d0bfe22SLorenzo Colitti fl6.fl6_icmp_type = user_icmph.icmp6_type; 1486d0bfe22SLorenzo Colitti fl6.fl6_icmp_code = user_icmph.icmp6_code; 1493df98d79SPaul Moore security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); 1506d0bfe22SLorenzo Colitti 15138b7097bSHannes Frederic Sowa fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 15238b7097bSHannes Frederic Sowa 15396818159SAlexey Kodanev dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false); 1546d0bfe22SLorenzo Colitti if (IS_ERR(dst)) 1556d0bfe22SLorenzo Colitti return PTR_ERR(dst); 1566d0bfe22SLorenzo Colitti rt = (struct rt6_info *) dst; 1576d0bfe22SLorenzo Colitti 1586d0bfe22SLorenzo Colitti if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 1596d0bfe22SLorenzo Colitti fl6.flowi6_oif = np->mcast_oif; 1606d0bfe22SLorenzo Colitti else if (!fl6.flowi6_oif) 1616d0bfe22SLorenzo Colitti fl6.flowi6_oif = np->ucast_oif; 1626d0bfe22SLorenzo Colitti 1636d0bfe22SLorenzo Colitti pfh.icmph.type = user_icmph.icmp6_type; 1646d0bfe22SLorenzo Colitti pfh.icmph.code = user_icmph.icmp6_code; 1656d0bfe22SLorenzo Colitti pfh.icmph.checksum = 0; 1666d0bfe22SLorenzo Colitti pfh.icmph.un.echo.id = inet->inet_sport; 1676d0bfe22SLorenzo Colitti pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence; 168cacdc7d2SAl Viro pfh.msg = msg; 1696d0bfe22SLorenzo Colitti pfh.wcheck = 0; 1706d0bfe22SLorenzo Colitti pfh.family = AF_INET6; 1716d0bfe22SLorenzo Colitti 17213651224SJakub Kicinski if (ipc6.hlimit < 0) 17326879da5SWei Wang ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 1746d0bfe22SLorenzo Colitti 175a1bdc455SLorenzo Colitti lock_sock(sk); 1766d0bfe22SLorenzo Colitti err = ip6_append_data(sk, ping_getfrag, &pfh, len, 1770d24148bSEric Dumazet sizeof(struct icmp6hdr), &ipc6, &fl6, rt, 1785fdaa88dSWillem de Bruijn MSG_DONTWAIT); 1796d0bfe22SLorenzo Colitti 1806d0bfe22SLorenzo Colitti if (err) { 18143a43b60SHannes Frederic Sowa ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev, 1826d0bfe22SLorenzo Colitti ICMP6_MIB_OUTERRORS); 1836d0bfe22SLorenzo Colitti ip6_flush_pending_frames(sk); 1846d0bfe22SLorenzo Colitti } else { 1854e64b1edSJoe Perches icmpv6_push_pending_frames(sk, &fl6, 1864e64b1edSJoe Perches (struct icmp6hdr *)&pfh.icmph, len); 1876d0bfe22SLorenzo Colitti } 188a1bdc455SLorenzo Colitti release_sock(sk); 1896d0bfe22SLorenzo Colitti 19003c2778aSDave Jones dst_release(dst); 19103c2778aSDave Jones 192fbfe80c8SLorenzo Colitti if (err) 1936d0bfe22SLorenzo Colitti return err; 194fbfe80c8SLorenzo Colitti 195fbfe80c8SLorenzo Colitti return len; 1966d0bfe22SLorenzo Colitti } 197d862e546SLorenzo Colitti 1986579a023SHaishuang Yan struct proto pingv6_prot = { 1996579a023SHaishuang Yan .name = "PINGv6", 2006579a023SHaishuang Yan .owner = THIS_MODULE, 2016579a023SHaishuang Yan .init = ping_init_sock, 2026579a023SHaishuang Yan .close = ping_close, 2030ffe2412SYiFei Zhu .pre_connect = ping_v6_pre_connect, 2046579a023SHaishuang Yan .connect = ip6_datagram_connect_v6_only, 205286c72deSEric Dumazet .disconnect = __udp_disconnect, 2066579a023SHaishuang Yan .setsockopt = ipv6_setsockopt, 2076579a023SHaishuang Yan .getsockopt = ipv6_getsockopt, 2086579a023SHaishuang Yan .sendmsg = ping_v6_sendmsg, 2096579a023SHaishuang Yan .recvmsg = ping_recvmsg, 2106579a023SHaishuang Yan .bind = ping_bind, 2116579a023SHaishuang Yan .backlog_rcv = ping_queue_rcv_skb, 2126579a023SHaishuang Yan .hash = ping_hash, 2136579a023SHaishuang Yan .unhash = ping_unhash, 2146579a023SHaishuang Yan .get_port = ping_get_port, 21591a760b2SMenglong Dong .put_port = ping_unhash, 2166579a023SHaishuang Yan .obj_size = sizeof(struct raw6_sock), 2176579a023SHaishuang Yan }; 2186579a023SHaishuang Yan EXPORT_SYMBOL_GPL(pingv6_prot); 2196579a023SHaishuang Yan 2206579a023SHaishuang Yan static struct inet_protosw pingv6_protosw = { 2216579a023SHaishuang Yan .type = SOCK_DGRAM, 2226579a023SHaishuang Yan .protocol = IPPROTO_ICMPV6, 2236579a023SHaishuang Yan .prot = &pingv6_prot, 22477d4b1d3SEric Dumazet .ops = &inet6_sockraw_ops, 2256579a023SHaishuang Yan .flags = INET_PROTOSW_REUSE, 2266579a023SHaishuang Yan }; 2276579a023SHaishuang Yan 228d862e546SLorenzo Colitti #ifdef CONFIG_PROC_FS 229d862e546SLorenzo Colitti static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos) 230d862e546SLorenzo Colitti { 231d862e546SLorenzo Colitti return ping_seq_start(seq, pos, AF_INET6); 232d862e546SLorenzo Colitti } 233d862e546SLorenzo Colitti 234a06a2d37SWu Fengguang static int ping_v6_seq_show(struct seq_file *seq, void *v) 235d862e546SLorenzo Colitti { 236d862e546SLorenzo Colitti if (v == SEQ_START_TOKEN) { 237d862e546SLorenzo Colitti seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 238d862e546SLorenzo Colitti } else { 239d862e546SLorenzo Colitti int bucket = ((struct ping_iter_state *) seq->private)->bucket; 240*abc17a11SEric Dumazet struct inet_sock *inet = inet_sk((struct sock *)v); 241d862e546SLorenzo Colitti __u16 srcp = ntohs(inet->inet_sport); 242d862e546SLorenzo Colitti __u16 destp = ntohs(inet->inet_dport); 243d862e546SLorenzo Colitti ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); 244d862e546SLorenzo Colitti } 245d862e546SLorenzo Colitti return 0; 246d862e546SLorenzo Colitti } 247d862e546SLorenzo Colitti 248f4550221SChristoph Hellwig static const struct seq_operations ping_v6_seq_ops = { 249d862e546SLorenzo Colitti .start = ping_v6_seq_start, 250d862e546SLorenzo Colitti .show = ping_v6_seq_show, 251d862e546SLorenzo Colitti .next = ping_seq_next, 252d862e546SLorenzo Colitti .stop = ping_seq_stop, 253f4550221SChristoph Hellwig }; 254f4550221SChristoph Hellwig 255d862e546SLorenzo Colitti static int __net_init ping_v6_proc_init_net(struct net *net) 256d862e546SLorenzo Colitti { 257c3506372SChristoph Hellwig if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops, 258c3506372SChristoph Hellwig sizeof(struct ping_iter_state))) 259f4550221SChristoph Hellwig return -ENOMEM; 260f4550221SChristoph Hellwig return 0; 261d862e546SLorenzo Colitti } 262d862e546SLorenzo Colitti 263d23dbc47SChristophe JAILLET static void __net_exit ping_v6_proc_exit_net(struct net *net) 264d862e546SLorenzo Colitti { 265f4550221SChristoph Hellwig remove_proc_entry("icmp6", net->proc_net); 266d862e546SLorenzo Colitti } 267d862e546SLorenzo Colitti 268d862e546SLorenzo Colitti static struct pernet_operations ping_v6_net_ops = { 269d862e546SLorenzo Colitti .init = ping_v6_proc_init_net, 270d862e546SLorenzo Colitti .exit = ping_v6_proc_exit_net, 271d862e546SLorenzo Colitti }; 272d862e546SLorenzo Colitti #endif 273d862e546SLorenzo Colitti 274d862e546SLorenzo Colitti int __init pingv6_init(void) 275d862e546SLorenzo Colitti { 276d862e546SLorenzo Colitti #ifdef CONFIG_PROC_FS 277d862e546SLorenzo Colitti int ret = register_pernet_subsys(&ping_v6_net_ops); 278d862e546SLorenzo Colitti if (ret) 279d862e546SLorenzo Colitti return ret; 280d862e546SLorenzo Colitti #endif 281d862e546SLorenzo Colitti pingv6_ops.ipv6_recv_error = ipv6_recv_error; 2824b261c75SHannes Frederic Sowa pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl; 2834b261c75SHannes Frederic Sowa pingv6_ops.ip6_datagram_recv_specific_ctl = 2844b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl; 285d862e546SLorenzo Colitti pingv6_ops.icmpv6_err_convert = icmpv6_err_convert; 286d862e546SLorenzo Colitti pingv6_ops.ipv6_icmp_error = ipv6_icmp_error; 287d862e546SLorenzo Colitti pingv6_ops.ipv6_chk_addr = ipv6_chk_addr; 288d862e546SLorenzo Colitti return inet6_register_protosw(&pingv6_protosw); 289d862e546SLorenzo Colitti } 290d862e546SLorenzo Colitti 291d862e546SLorenzo Colitti /* This never gets called because it's not possible to unload the ipv6 module, 292d862e546SLorenzo Colitti * but just in case. 293d862e546SLorenzo Colitti */ 294d862e546SLorenzo Colitti void pingv6_exit(void) 295d862e546SLorenzo Colitti { 296d862e546SLorenzo Colitti pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error; 2974b261c75SHannes Frederic Sowa pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl; 2984b261c75SHannes Frederic Sowa pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl; 299d862e546SLorenzo Colitti pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert; 300d862e546SLorenzo Colitti pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error; 301d862e546SLorenzo Colitti pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr; 302d862e546SLorenzo Colitti #ifdef CONFIG_PROC_FS 303d862e546SLorenzo Colitti unregister_pernet_subsys(&ping_v6_net_ops); 304d862e546SLorenzo Colitti #endif 305d862e546SLorenzo Colitti inet6_unregister_protosw(&pingv6_protosw); 306d862e546SLorenzo Colitti } 307