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270 lines
7.1 KiB
270 lines
7.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* INET An implementation of the TCP/IP protocol suite for the LINUX |
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* operating system. INET is implemented using the BSD Socket |
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* interface as the means of communication with the user level. |
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* |
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* "Ping" sockets |
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* |
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* Based on ipv4/ping.c code. |
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* |
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* Authors: Lorenzo Colitti (IPv6 support) |
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* Vasiliy Kulikov / Openwall (IPv4 implementation, for Linux 2.6), |
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* Pavel Kankovsky (IPv4 implementation, for Linux 2.4.32) |
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*/ |
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#include <net/addrconf.h> |
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#include <net/ipv6.h> |
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#include <net/ip6_route.h> |
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#include <net/protocol.h> |
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#include <net/udp.h> |
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#include <net/transp_v6.h> |
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#include <linux/proc_fs.h> |
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#include <net/ping.h> |
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/* Compatibility glue so we can support IPv6 when it's compiled as a module */ |
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static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, |
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int *addr_len) |
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{ |
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return -EAFNOSUPPORT; |
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} |
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static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, |
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struct sk_buff *skb) |
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{ |
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} |
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static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err) |
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{ |
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return -EAFNOSUPPORT; |
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} |
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static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
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__be16 port, u32 info, u8 *payload) {} |
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static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr, |
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const struct net_device *dev, int strict) |
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{ |
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return 0; |
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} |
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static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
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{ |
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struct inet_sock *inet = inet_sk(sk); |
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struct ipv6_pinfo *np = inet6_sk(sk); |
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struct icmp6hdr user_icmph; |
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int addr_type; |
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struct in6_addr *daddr; |
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int oif = 0; |
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struct flowi6 fl6; |
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int err; |
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struct dst_entry *dst; |
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struct rt6_info *rt; |
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struct pingfakehdr pfh; |
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struct ipcm6_cookie ipc6; |
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pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); |
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err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph, |
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sizeof(user_icmph)); |
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if (err) |
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return err; |
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if (msg->msg_name) { |
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DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name); |
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if (msg->msg_namelen < sizeof(*u)) |
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return -EINVAL; |
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if (u->sin6_family != AF_INET6) { |
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return -EAFNOSUPPORT; |
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} |
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daddr = &(u->sin6_addr); |
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if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr))) |
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oif = u->sin6_scope_id; |
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} else { |
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if (sk->sk_state != TCP_ESTABLISHED) |
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return -EDESTADDRREQ; |
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daddr = &sk->sk_v6_daddr; |
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} |
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if (!oif) |
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oif = sk->sk_bound_dev_if; |
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if (!oif) |
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oif = np->sticky_pktinfo.ipi6_ifindex; |
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if (!oif && ipv6_addr_is_multicast(daddr)) |
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oif = np->mcast_oif; |
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else if (!oif) |
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oif = np->ucast_oif; |
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addr_type = ipv6_addr_type(daddr); |
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if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) || |
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(addr_type & IPV6_ADDR_MAPPED) || |
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(oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if)) |
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return -EINVAL; |
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/* TODO: use ip6_datagram_send_ctl to get options from cmsg */ |
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memset(&fl6, 0, sizeof(fl6)); |
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fl6.flowi6_proto = IPPROTO_ICMPV6; |
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fl6.saddr = np->saddr; |
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fl6.daddr = *daddr; |
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fl6.flowi6_oif = oif; |
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fl6.flowi6_mark = sk->sk_mark; |
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fl6.flowi6_uid = sk->sk_uid; |
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fl6.fl6_icmp_type = user_icmph.icmp6_type; |
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fl6.fl6_icmp_code = user_icmph.icmp6_code; |
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security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); |
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ipcm6_init_sk(&ipc6, np); |
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ipc6.sockc.mark = sk->sk_mark; |
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fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); |
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dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false); |
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if (IS_ERR(dst)) |
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return PTR_ERR(dst); |
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rt = (struct rt6_info *) dst; |
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if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
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fl6.flowi6_oif = np->mcast_oif; |
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else if (!fl6.flowi6_oif) |
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fl6.flowi6_oif = np->ucast_oif; |
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pfh.icmph.type = user_icmph.icmp6_type; |
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pfh.icmph.code = user_icmph.icmp6_code; |
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pfh.icmph.checksum = 0; |
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pfh.icmph.un.echo.id = inet->inet_sport; |
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pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence; |
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pfh.msg = msg; |
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pfh.wcheck = 0; |
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pfh.family = AF_INET6; |
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ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
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lock_sock(sk); |
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err = ip6_append_data(sk, ping_getfrag, &pfh, len, |
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0, &ipc6, &fl6, rt, |
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MSG_DONTWAIT); |
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if (err) { |
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ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev, |
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ICMP6_MIB_OUTERRORS); |
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ip6_flush_pending_frames(sk); |
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} else { |
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icmpv6_push_pending_frames(sk, &fl6, |
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(struct icmp6hdr *)&pfh.icmph, len); |
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} |
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release_sock(sk); |
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dst_release(dst); |
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if (err) |
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return err; |
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return len; |
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} |
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struct proto pingv6_prot = { |
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.name = "PINGv6", |
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.owner = THIS_MODULE, |
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.init = ping_init_sock, |
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.close = ping_close, |
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.connect = ip6_datagram_connect_v6_only, |
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.disconnect = __udp_disconnect, |
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.setsockopt = ipv6_setsockopt, |
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.getsockopt = ipv6_getsockopt, |
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.sendmsg = ping_v6_sendmsg, |
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.recvmsg = ping_recvmsg, |
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.bind = ping_bind, |
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.backlog_rcv = ping_queue_rcv_skb, |
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.hash = ping_hash, |
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.unhash = ping_unhash, |
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.get_port = ping_get_port, |
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.obj_size = sizeof(struct raw6_sock), |
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}; |
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EXPORT_SYMBOL_GPL(pingv6_prot); |
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static struct inet_protosw pingv6_protosw = { |
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.type = SOCK_DGRAM, |
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.protocol = IPPROTO_ICMPV6, |
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.prot = &pingv6_prot, |
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.ops = &inet6_sockraw_ops, |
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.flags = INET_PROTOSW_REUSE, |
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}; |
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#ifdef CONFIG_PROC_FS |
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static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos) |
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{ |
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return ping_seq_start(seq, pos, AF_INET6); |
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} |
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static int ping_v6_seq_show(struct seq_file *seq, void *v) |
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{ |
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if (v == SEQ_START_TOKEN) { |
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seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); |
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} else { |
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int bucket = ((struct ping_iter_state *) seq->private)->bucket; |
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struct inet_sock *inet = inet_sk(v); |
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__u16 srcp = ntohs(inet->inet_sport); |
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__u16 destp = ntohs(inet->inet_dport); |
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ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); |
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} |
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return 0; |
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} |
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static const struct seq_operations ping_v6_seq_ops = { |
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.start = ping_v6_seq_start, |
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.show = ping_v6_seq_show, |
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.next = ping_seq_next, |
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.stop = ping_seq_stop, |
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}; |
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static int __net_init ping_v6_proc_init_net(struct net *net) |
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{ |
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if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops, |
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sizeof(struct ping_iter_state))) |
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return -ENOMEM; |
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return 0; |
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} |
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static void __net_exit ping_v6_proc_exit_net(struct net *net) |
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{ |
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remove_proc_entry("icmp6", net->proc_net); |
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} |
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static struct pernet_operations ping_v6_net_ops = { |
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.init = ping_v6_proc_init_net, |
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.exit = ping_v6_proc_exit_net, |
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}; |
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#endif |
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int __init pingv6_init(void) |
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{ |
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#ifdef CONFIG_PROC_FS |
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int ret = register_pernet_subsys(&ping_v6_net_ops); |
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if (ret) |
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return ret; |
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#endif |
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pingv6_ops.ipv6_recv_error = ipv6_recv_error; |
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pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl; |
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pingv6_ops.ip6_datagram_recv_specific_ctl = |
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ip6_datagram_recv_specific_ctl; |
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pingv6_ops.icmpv6_err_convert = icmpv6_err_convert; |
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pingv6_ops.ipv6_icmp_error = ipv6_icmp_error; |
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pingv6_ops.ipv6_chk_addr = ipv6_chk_addr; |
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return inet6_register_protosw(&pingv6_protosw); |
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} |
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/* This never gets called because it's not possible to unload the ipv6 module, |
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* but just in case. |
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*/ |
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void pingv6_exit(void) |
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{ |
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pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error; |
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pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl; |
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pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl; |
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pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert; |
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pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error; |
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pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr; |
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#ifdef CONFIG_PROC_FS |
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unregister_pernet_subsys(&ping_v6_net_ops); |
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#endif |
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inet6_unregister_protosw(&pingv6_protosw); |
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}
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