1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
9 * Based on ipv4/ping.c code.
11 * Authors: Lorenzo Colitti (IPv6 support)
12 * Vasiliy Kulikov / Openwall (IPv4 implementation, for Linux 2.6),
13 * Pavel Kankovsky (IPv4 implementation, for Linux 2.4.32)
16 #include <net/addrconf.h>
18 #include <net/ip6_route.h>
19 #include <net/protocol.h>
21 #include <net/transp_v6.h>
22 #include <linux/proc_fs.h>
23 #include <linux/bpf-cgroup.h>
26 /* Compatibility glue so we can support IPv6 when it's compiled as a module */
27 static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
32 static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
36 static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
40 static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
41 __be16 port, u32 info, u8 *payload) {}
42 static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
43 const struct net_device *dev, int strict)
48 static int ping_v6_pre_connect(struct sock *sk, struct sockaddr *uaddr,
51 /* This check is replicated from __ip6_datagram_connect() and
52 * intended to prevent BPF program called below from accessing
53 * bytes that are out of the bound specified by user in addr_len.
56 if (addr_len < SIN6_LEN_RFC2133)
59 return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr);
62 static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
64 struct inet_sock *inet = inet_sk(sk);
65 struct ipv6_pinfo *np = inet6_sk(sk);
66 struct icmp6hdr user_icmph;
68 struct in6_addr *daddr;
72 struct dst_entry *dst;
74 struct pingfakehdr pfh;
75 struct ipcm6_cookie ipc6;
77 err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
82 memset(&fl6, 0, sizeof(fl6));
85 DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
86 if (msg->msg_namelen < sizeof(*u))
88 if (u->sin6_family != AF_INET6) {
91 daddr = &(u->sin6_addr);
93 fl6.flowlabel = u->sin6_flowinfo & IPV6_FLOWINFO_MASK;
94 if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr)))
95 oif = u->sin6_scope_id;
97 if (sk->sk_state != TCP_ESTABLISHED)
99 daddr = &sk->sk_v6_daddr;
100 fl6.flowlabel = np->flow_label;
104 oif = sk->sk_bound_dev_if;
107 oif = np->sticky_pktinfo.ipi6_ifindex;
109 if (!oif && ipv6_addr_is_multicast(daddr))
114 addr_type = ipv6_addr_type(daddr);
115 if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) ||
116 (addr_type & IPV6_ADDR_MAPPED) ||
117 (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if &&
118 l3mdev_master_ifindex_by_index(sock_net(sk), oif) != sk->sk_bound_dev_if))
121 ipcm6_init_sk(&ipc6, np);
122 ipc6.sockc.tsflags = sk->sk_tsflags;
123 ipc6.sockc.mark = sk->sk_mark;
125 fl6.flowi6_oif = oif;
127 if (msg->msg_controllen) {
128 struct ipv6_txoptions opt = {};
130 opt.tot_len = sizeof(opt);
133 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
137 /* Changes to txoptions and flow info are not implemented, yet.
143 fl6.flowi6_proto = IPPROTO_ICMPV6;
144 fl6.saddr = np->saddr;
146 fl6.flowi6_mark = ipc6.sockc.mark;
147 fl6.flowi6_uid = sk->sk_uid;
148 fl6.fl6_icmp_type = user_icmph.icmp6_type;
149 fl6.fl6_icmp_code = user_icmph.icmp6_code;
150 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
152 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
154 dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false);
157 rt = (struct rt6_info *) dst;
159 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
160 fl6.flowi6_oif = np->mcast_oif;
161 else if (!fl6.flowi6_oif)
162 fl6.flowi6_oif = np->ucast_oif;
164 pfh.icmph.type = user_icmph.icmp6_type;
165 pfh.icmph.code = user_icmph.icmp6_code;
166 pfh.icmph.checksum = 0;
167 pfh.icmph.un.echo.id = inet->inet_sport;
168 pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
171 pfh.family = AF_INET6;
174 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
177 err = ip6_append_data(sk, ping_getfrag, &pfh, len,
178 sizeof(struct icmp6hdr), &ipc6, &fl6, rt,
182 ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
183 ICMP6_MIB_OUTERRORS);
184 ip6_flush_pending_frames(sk);
186 icmpv6_push_pending_frames(sk, &fl6,
187 (struct icmp6hdr *)&pfh.icmph, len);
199 struct proto pingv6_prot = {
201 .owner = THIS_MODULE,
202 .init = ping_init_sock,
204 .pre_connect = ping_v6_pre_connect,
205 .connect = ip6_datagram_connect_v6_only,
206 .disconnect = __udp_disconnect,
207 .setsockopt = ipv6_setsockopt,
208 .getsockopt = ipv6_getsockopt,
209 .sendmsg = ping_v6_sendmsg,
210 .recvmsg = ping_recvmsg,
212 .backlog_rcv = ping_queue_rcv_skb,
214 .unhash = ping_unhash,
215 .get_port = ping_get_port,
216 .put_port = ping_unhash,
217 .obj_size = sizeof(struct raw6_sock),
219 EXPORT_SYMBOL_GPL(pingv6_prot);
221 static struct inet_protosw pingv6_protosw = {
223 .protocol = IPPROTO_ICMPV6,
224 .prot = &pingv6_prot,
225 .ops = &inet6_sockraw_ops,
226 .flags = INET_PROTOSW_REUSE,
229 #ifdef CONFIG_PROC_FS
230 static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos)
232 return ping_seq_start(seq, pos, AF_INET6);
235 static int ping_v6_seq_show(struct seq_file *seq, void *v)
237 if (v == SEQ_START_TOKEN) {
238 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
240 int bucket = ((struct ping_iter_state *) seq->private)->bucket;
241 struct inet_sock *inet = inet_sk((struct sock *)v);
242 __u16 srcp = ntohs(inet->inet_sport);
243 __u16 destp = ntohs(inet->inet_dport);
244 ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
249 static const struct seq_operations ping_v6_seq_ops = {
250 .start = ping_v6_seq_start,
251 .show = ping_v6_seq_show,
252 .next = ping_seq_next,
253 .stop = ping_seq_stop,
256 static int __net_init ping_v6_proc_init_net(struct net *net)
258 if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops,
259 sizeof(struct ping_iter_state)))
264 static void __net_exit ping_v6_proc_exit_net(struct net *net)
266 remove_proc_entry("icmp6", net->proc_net);
269 static struct pernet_operations ping_v6_net_ops = {
270 .init = ping_v6_proc_init_net,
271 .exit = ping_v6_proc_exit_net,
275 int __init pingv6_init(void)
277 #ifdef CONFIG_PROC_FS
278 int ret = register_pernet_subsys(&ping_v6_net_ops);
282 pingv6_ops.ipv6_recv_error = ipv6_recv_error;
283 pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
284 pingv6_ops.ip6_datagram_recv_specific_ctl =
285 ip6_datagram_recv_specific_ctl;
286 pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
287 pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
288 pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
289 return inet6_register_protosw(&pingv6_protosw);
292 /* This never gets called because it's not possible to unload the ipv6 module,
295 void pingv6_exit(void)
297 pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
298 pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
299 pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
300 pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
301 pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
302 pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
303 #ifdef CONFIG_PROC_FS
304 unregister_pernet_subsys(&ping_v6_net_ops);
306 inet6_unregister_protosw(&pingv6_protosw);