| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * "Ping" sockets |
| * |
| * 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. |
| * |
| * Based on ipv4/udp.c code. |
| * |
| * Authors: Vasiliy Kulikov / Openwall (for Linux 2.6), |
| * Pavel Kankovsky (for Linux 2.4.32) |
| * |
| * Pavel gave all rights to bugs to Vasiliy, |
| * none of the bugs are Pavel's now. |
| * |
| */ |
| |
| #include <asm/system.h> |
| #include <linux/uaccess.h> |
| #include <asm/ioctls.h> |
| #include <linux/types.h> |
| #include <linux/fcntl.h> |
| #include <linux/socket.h> |
| #include <linux/sockios.h> |
| #include <linux/in.h> |
| #include <linux/errno.h> |
| #include <linux/timer.h> |
| #include <linux/mm.h> |
| #include <linux/inet.h> |
| #include <linux/netdevice.h> |
| #include <net/snmp.h> |
| #include <net/ip.h> |
| #include <net/ipv6.h> |
| #include <net/icmp.h> |
| #include <net/protocol.h> |
| #include <linux/skbuff.h> |
| #include <linux/proc_fs.h> |
| #include <net/sock.h> |
| #include <net/ping.h> |
| #include <net/icmp.h> |
| #include <net/udp.h> |
| #include <net/route.h> |
| #include <net/inet_common.h> |
| #include <net/checksum.h> |
| |
| |
| struct ping_table ping_table __read_mostly; |
| |
| u16 ping_port_rover; |
| |
| static inline int ping_hashfn(struct net *net, unsigned num, unsigned mask) |
| { |
| int res = (num + net_hash_mix(net)) & mask; |
| pr_debug("hash(%d) = %d\n", num, res); |
| return res; |
| } |
| |
| static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table, |
| struct net *net, unsigned num) |
| { |
| return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)]; |
| } |
| |
| static int ping_v4_get_port(struct sock *sk, unsigned short ident) |
| { |
| struct hlist_nulls_node *node; |
| struct hlist_nulls_head *hlist; |
| struct inet_sock *isk, *isk2; |
| struct sock *sk2 = NULL; |
| |
| isk = inet_sk(sk); |
| write_lock_bh(&ping_table.lock); |
| if (ident == 0) { |
| u32 i; |
| u16 result = ping_port_rover + 1; |
| |
| for (i = 0; i < (1L << 16); i++, result++) { |
| if (!result) |
| result++; /* avoid zero */ |
| hlist = ping_hashslot(&ping_table, sock_net(sk), |
| result); |
| ping_portaddr_for_each_entry(sk2, node, hlist) { |
| isk2 = inet_sk(sk2); |
| |
| if (isk2->inet_num == result) |
| goto next_port; |
| } |
| |
| /* found */ |
| ping_port_rover = ident = result; |
| break; |
| next_port: |
| ; |
| } |
| if (i >= (1L << 16)) |
| goto fail; |
| } else { |
| hlist = ping_hashslot(&ping_table, sock_net(sk), ident); |
| ping_portaddr_for_each_entry(sk2, node, hlist) { |
| isk2 = inet_sk(sk2); |
| |
| if ((isk2->inet_num == ident) && |
| (sk2 != sk) && |
| (!sk2->sk_reuse || !sk->sk_reuse)) |
| goto fail; |
| } |
| } |
| |
| pr_debug("found port/ident = %d\n", ident); |
| isk->inet_num = ident; |
| if (sk_unhashed(sk)) { |
| pr_debug("was not hashed\n"); |
| sock_hold(sk); |
| hlist_nulls_add_head(&sk->sk_nulls_node, hlist); |
| sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
| } |
| write_unlock_bh(&ping_table.lock); |
| return 0; |
| |
| fail: |
| write_unlock_bh(&ping_table.lock); |
| return 1; |
| } |
| |
| static void ping_v4_hash(struct sock *sk) |
| { |
| pr_debug("ping_v4_hash(sk->port=%u)\n", inet_sk(sk)->inet_num); |
| BUG(); /* "Please do not press this button again." */ |
| } |
| |
| static void ping_v4_unhash(struct sock *sk) |
| { |
| struct inet_sock *isk = inet_sk(sk); |
| pr_debug("ping_v4_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num); |
| if (sk_hashed(sk)) { |
| struct hlist_nulls_head *hslot; |
| |
| hslot = ping_hashslot(&ping_table, sock_net(sk), isk->inet_num); |
| write_lock_bh(&ping_table.lock); |
| hlist_nulls_del(&sk->sk_nulls_node); |
| sock_put(sk); |
| isk->inet_num = isk->inet_sport = 0; |
| sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
| write_unlock_bh(&ping_table.lock); |
| } |
| } |
| |
| struct sock *ping_v4_lookup(struct net *net, u32 saddr, u32 daddr, |
| u16 ident, int dif) |
| { |
| struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident); |
| struct sock *sk = NULL; |
| struct inet_sock *isk; |
| struct hlist_nulls_node *hnode; |
| |
| pr_debug("try to find: num = %d, daddr = %ld, dif = %d\n", |
| (int)ident, (unsigned long)daddr, dif); |
| read_lock_bh(&ping_table.lock); |
| |
| ping_portaddr_for_each_entry(sk, hnode, hslot) { |
| isk = inet_sk(sk); |
| |
| pr_debug("found: %p: num = %d, daddr = %ld, dif = %d\n", sk, |
| (int)isk->inet_num, (unsigned long)isk->inet_rcv_saddr, |
| sk->sk_bound_dev_if); |
| |
| pr_debug("iterate\n"); |
| if (isk->inet_num != ident) |
| continue; |
| if (isk->inet_rcv_saddr && isk->inet_rcv_saddr != daddr) |
| continue; |
| if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) |
| continue; |
| |
| sock_hold(sk); |
| goto exit; |
| } |
| |
| sk = NULL; |
| exit: |
| read_unlock_bh(&ping_table.lock); |
| |
| return sk; |
| } |
| |
| static int ping_init_sock(struct sock *sk) |
| { |
| struct net *net = sock_net(sk); |
| gid_t group = current_egid(); |
| gid_t range[2]; |
| struct group_info *group_info = get_current_groups(); |
| int i, j, count = group_info->ngroups; |
| |
| inet_get_ping_group_range_net(net, range, range+1); |
| if (range[0] <= group && group <= range[1]) |
| return 0; |
| |
| for (i = 0; i < group_info->nblocks; i++) { |
| int cp_count = min_t(int, NGROUPS_PER_BLOCK, count); |
| |
| for (j = 0; j < cp_count; j++) { |
| group = group_info->blocks[i][j]; |
| if (range[0] <= group && group <= range[1]) |
| return 0; |
| } |
| |
| count -= cp_count; |
| } |
| |
| return -EACCES; |
| } |
| |
| static void ping_close(struct sock *sk, long timeout) |
| { |
| pr_debug("ping_close(sk=%p,sk->num=%u)\n", |
| inet_sk(sk), inet_sk(sk)->inet_num); |
| pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter); |
| |
| sk_common_release(sk); |
| } |
| |
| /* |
| * We need our own bind because there are no privileged id's == local ports. |
| * Moreover, we don't allow binding to multi- and broadcast addresses. |
| */ |
| |
| static int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| { |
| struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; |
| struct inet_sock *isk = inet_sk(sk); |
| unsigned short snum; |
| int chk_addr_ret; |
| int err; |
| |
| if (addr_len < sizeof(struct sockaddr_in)) |
| return -EINVAL; |
| |
| pr_debug("ping_v4_bind(sk=%p,sa_addr=%08x,sa_port=%d)\n", |
| sk, addr->sin_addr.s_addr, ntohs(addr->sin_port)); |
| |
| chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); |
| if (addr->sin_addr.s_addr == INADDR_ANY) |
| chk_addr_ret = RTN_LOCAL; |
| |
| if ((sysctl_ip_nonlocal_bind == 0 && |
| isk->freebind == 0 && isk->transparent == 0 && |
| chk_addr_ret != RTN_LOCAL) || |
| chk_addr_ret == RTN_MULTICAST || |
| chk_addr_ret == RTN_BROADCAST) |
| return -EADDRNOTAVAIL; |
| |
| lock_sock(sk); |
| |
| err = -EINVAL; |
| if (isk->inet_num != 0) |
| goto out; |
| |
| err = -EADDRINUSE; |
| isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr; |
| snum = ntohs(addr->sin_port); |
| if (ping_v4_get_port(sk, snum) != 0) { |
| isk->inet_saddr = isk->inet_rcv_saddr = 0; |
| goto out; |
| } |
| |
| pr_debug("after bind(): num = %d, daddr = %ld, dif = %d\n", |
| (int)isk->inet_num, |
| (unsigned long) isk->inet_rcv_saddr, |
| (int)sk->sk_bound_dev_if); |
| |
| err = 0; |
| if (isk->inet_rcv_saddr) |
| sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
| if (snum) |
| sk->sk_userlocks |= SOCK_BINDPORT_LOCK; |
| isk->inet_sport = htons(isk->inet_num); |
| isk->inet_daddr = 0; |
| isk->inet_dport = 0; |
| sk_dst_reset(sk); |
| out: |
| release_sock(sk); |
| pr_debug("ping_v4_bind -> %d\n", err); |
| return err; |
| } |
| |
| /* |
| * Is this a supported type of ICMP message? |
| */ |
| |
| static inline int ping_supported(int type, int code) |
| { |
| if (type == ICMP_ECHO && code == 0) |
| return 1; |
| return 0; |
| } |
| |
| /* |
| * This routine is called by the ICMP module when it gets some |
| * sort of error condition. |
| */ |
| |
| static int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
| |
| void ping_err(struct sk_buff *skb, u32 info) |
| { |
| struct iphdr *iph = (struct iphdr *)skb->data; |
| struct icmphdr *icmph = (struct icmphdr *)(skb->data+(iph->ihl<<2)); |
| struct inet_sock *inet_sock; |
| int type = icmph->type; |
| int code = icmph->code; |
| struct net *net = dev_net(skb->dev); |
| struct sock *sk; |
| int harderr; |
| int err; |
| |
| /* We assume the packet has already been checked by icmp_unreach */ |
| |
| if (!ping_supported(icmph->type, icmph->code)) |
| return; |
| |
| pr_debug("ping_err(type=%04x,code=%04x,id=%04x,seq=%04x)\n", type, |
| code, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence)); |
| |
| sk = ping_v4_lookup(net, iph->daddr, iph->saddr, |
| ntohs(icmph->un.echo.id), skb->dev->ifindex); |
| if (sk == NULL) { |
| ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
| pr_debug("no socket, dropping\n"); |
| return; /* No socket for error */ |
| } |
| pr_debug("err on socket %p\n", sk); |
| |
| err = 0; |
| harderr = 0; |
| inet_sock = inet_sk(sk); |
| |
| switch (type) { |
| default: |
| case ICMP_TIME_EXCEEDED: |
| err = EHOSTUNREACH; |
| break; |
| case ICMP_SOURCE_QUENCH: |
| /* This is not a real error but ping wants to see it. |
| * Report it with some fake errno. */ |
| err = EREMOTEIO; |
| break; |
| case ICMP_PARAMETERPROB: |
| err = EPROTO; |
| harderr = 1; |
| break; |
| case ICMP_DEST_UNREACH: |
| if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ |
| if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) { |
| err = EMSGSIZE; |
| harderr = 1; |
| break; |
| } |
| goto out; |
| } |
| err = EHOSTUNREACH; |
| if (code <= NR_ICMP_UNREACH) { |
| harderr = icmp_err_convert[code].fatal; |
| err = icmp_err_convert[code].errno; |
| } |
| break; |
| case ICMP_REDIRECT: |
| /* See ICMP_SOURCE_QUENCH */ |
| err = EREMOTEIO; |
| break; |
| } |
| |
| /* |
| * RFC1122: OK. Passes ICMP errors back to application, as per |
| * 4.1.3.3. |
| */ |
| if (!inet_sock->recverr) { |
| if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
| goto out; |
| } else { |
| ip_icmp_error(sk, skb, err, 0 /* no remote port */, |
| info, (u8 *)icmph); |
| } |
| sk->sk_err = err; |
| sk->sk_error_report(sk); |
| out: |
| sock_put(sk); |
| } |
| |
| /* |
| * Copy and checksum an ICMP Echo packet from user space into a buffer. |
| */ |
| |
| struct pingfakehdr { |
| struct icmphdr icmph; |
| struct iovec *iov; |
| u32 wcheck; |
| }; |
| |
| static int ping_getfrag(void *from, char * to, |
| int offset, int fraglen, int odd, struct sk_buff *skb) |
| { |
| struct pingfakehdr *pfh = (struct pingfakehdr *)from; |
| |
| if (offset == 0) { |
| if (fraglen < sizeof(struct icmphdr)) |
| BUG(); |
| if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr), |
| pfh->iov, 0, fraglen - sizeof(struct icmphdr), |
| &pfh->wcheck)) |
| return -EFAULT; |
| |
| return 0; |
| } |
| if (offset < sizeof(struct icmphdr)) |
| BUG(); |
| if (csum_partial_copy_fromiovecend |
| (to, pfh->iov, offset - sizeof(struct icmphdr), |
| fraglen, &pfh->wcheck)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| static int ping_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh, struct flowi4 *fl4) |
| { |
| struct sk_buff *skb = skb_peek(&sk->sk_write_queue); |
| |
| pfh->wcheck = csum_partial((char *)&pfh->icmph, |
| sizeof(struct icmphdr), pfh->wcheck); |
| pfh->icmph.checksum = csum_fold(pfh->wcheck); |
| memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr)); |
| skb->ip_summed = CHECKSUM_NONE; |
| return ip_push_pending_frames(sk, fl4); |
| } |
| |
| int ping_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| size_t len) |
| { |
| struct net *net = sock_net(sk); |
| struct flowi4 fl4; |
| struct inet_sock *inet = inet_sk(sk); |
| struct ipcm_cookie ipc; |
| struct icmphdr user_icmph; |
| struct pingfakehdr pfh; |
| struct rtable *rt = NULL; |
| struct ip_options_data opt_copy; |
| int free = 0; |
| u32 saddr, daddr, faddr; |
| u8 tos; |
| int err; |
| |
| pr_debug("ping_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); |
| |
| |
| if (len > 0xFFFF) |
| return -EMSGSIZE; |
| |
| /* |
| * Check the flags. |
| */ |
| |
| /* Mirror BSD error message compatibility */ |
| if (msg->msg_flags & MSG_OOB) |
| return -EOPNOTSUPP; |
| |
| /* |
| * Fetch the ICMP header provided by the userland. |
| * iovec is modified! |
| */ |
| |
| if (memcpy_fromiovec((u8 *)&user_icmph, msg->msg_iov, |
| sizeof(struct icmphdr))) |
| return -EFAULT; |
| if (!ping_supported(user_icmph.type, user_icmph.code)) |
| return -EINVAL; |
| |
| /* |
| * Get and verify the address. |
| */ |
| |
| if (msg->msg_name) { |
| struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; |
| if (msg->msg_namelen < sizeof(*usin)) |
| return -EINVAL; |
| if (usin->sin_family != AF_INET) |
| return -EINVAL; |
| daddr = usin->sin_addr.s_addr; |
| /* no remote port */ |
| } else { |
| if (sk->sk_state != TCP_ESTABLISHED) |
| return -EDESTADDRREQ; |
| daddr = inet->inet_daddr; |
| /* no remote port */ |
| } |
| |
| ipc.addr = inet->inet_saddr; |
| ipc.opt = NULL; |
| ipc.oif = sk->sk_bound_dev_if; |
| ipc.tx_flags = 0; |
| err = sock_tx_timestamp(sk, &ipc.tx_flags); |
| if (err) |
| return err; |
| |
| if (msg->msg_controllen) { |
| err = ip_cmsg_send(sock_net(sk), msg, &ipc); |
| if (err) |
| return err; |
| if (ipc.opt) |
| free = 1; |
| } |
| if (!ipc.opt) { |
| struct ip_options_rcu *inet_opt; |
| |
| rcu_read_lock(); |
| inet_opt = rcu_dereference(inet->inet_opt); |
| if (inet_opt) { |
| memcpy(&opt_copy, inet_opt, |
| sizeof(*inet_opt) + inet_opt->opt.optlen); |
| ipc.opt = &opt_copy.opt; |
| } |
| rcu_read_unlock(); |
| } |
| |
| saddr = ipc.addr; |
| ipc.addr = faddr = daddr; |
| |
| if (ipc.opt && ipc.opt->opt.srr) { |
| if (!daddr) |
| return -EINVAL; |
| faddr = ipc.opt->opt.faddr; |
| } |
| tos = RT_TOS(inet->tos); |
| if (sock_flag(sk, SOCK_LOCALROUTE) || |
| (msg->msg_flags & MSG_DONTROUTE) || |
| (ipc.opt && ipc.opt->opt.is_strictroute)) { |
| tos |= RTO_ONLINK; |
| } |
| |
| if (ipv4_is_multicast(daddr)) { |
| if (!ipc.oif) |
| ipc.oif = inet->mc_index; |
| if (!saddr) |
| saddr = inet->mc_addr; |
| } |
| |
| flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos, |
| RT_SCOPE_UNIVERSE, sk->sk_protocol, |
| inet_sk_flowi_flags(sk), faddr, saddr, 0, 0); |
| |
| security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); |
| rt = ip_route_output_flow(net, &fl4, sk); |
| if (IS_ERR(rt)) { |
| err = PTR_ERR(rt); |
| rt = NULL; |
| if (err == -ENETUNREACH) |
| IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); |
| goto out; |
| } |
| |
| err = -EACCES; |
| if ((rt->rt_flags & RTCF_BROADCAST) && |
| !sock_flag(sk, SOCK_BROADCAST)) |
| goto out; |
| |
| if (msg->msg_flags & MSG_CONFIRM) |
| goto do_confirm; |
| back_from_confirm: |
| |
| if (!ipc.addr) |
| ipc.addr = fl4.daddr; |
| |
| lock_sock(sk); |
| |
| pfh.icmph.type = user_icmph.type; /* already checked */ |
| pfh.icmph.code = user_icmph.code; /* ditto */ |
| pfh.icmph.checksum = 0; |
| pfh.icmph.un.echo.id = inet->inet_sport; |
| pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence; |
| pfh.iov = msg->msg_iov; |
| pfh.wcheck = 0; |
| |
| err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len, |
| 0, &ipc, &rt, msg->msg_flags); |
| if (err) |
| ip_flush_pending_frames(sk); |
| else |
| err = ping_push_pending_frames(sk, &pfh, &fl4); |
| release_sock(sk); |
| |
| out: |
| ip_rt_put(rt); |
| if (free) |
| kfree(ipc.opt); |
| if (!err) { |
| icmp_out_count(sock_net(sk), user_icmph.type); |
| return len; |
| } |
| return err; |
| |
| do_confirm: |
| dst_confirm(&rt->dst); |
| if (!(msg->msg_flags & MSG_PROBE) || len) |
| goto back_from_confirm; |
| err = 0; |
| goto out; |
| } |
| |
| /* |
| * IOCTL requests applicable to the UDP^H^H^HICMP protocol |
| */ |
| |
| int ping_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| { |
| pr_debug("ping_ioctl(sk=%p,sk->num=%u,cmd=%d,arg=%lu)\n", |
| inet_sk(sk), inet_sk(sk)->inet_num, cmd, arg); |
| switch (cmd) { |
| case SIOCOUTQ: |
| case SIOCINQ: |
| return udp_ioctl(sk, cmd, arg); |
| default: |
| return -ENOIOCTLCMD; |
| } |
| } |
| |
| int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| size_t len, int noblock, int flags, int *addr_len) |
| { |
| struct inet_sock *isk = inet_sk(sk); |
| struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; |
| struct sk_buff *skb; |
| int copied, err; |
| |
| pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num); |
| |
| if (flags & MSG_OOB) |
| goto out; |
| |
| if (addr_len) |
| *addr_len = sizeof(*sin); |
| |
| if (flags & MSG_ERRQUEUE) |
| return ip_recv_error(sk, msg, len); |
| |
| skb = skb_recv_datagram(sk, flags, noblock, &err); |
| if (!skb) |
| goto out; |
| |
| copied = skb->len; |
| if (copied > len) { |
| msg->msg_flags |= MSG_TRUNC; |
| copied = len; |
| } |
| |
| /* Don't bother checking the checksum */ |
| err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| if (err) |
| goto done; |
| |
| sock_recv_timestamp(msg, sk, skb); |
| |
| /* Copy the address. */ |
| if (sin) { |
| sin->sin_family = AF_INET; |
| sin->sin_port = 0 /* skb->h.uh->source */; |
| sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
| memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); |
| } |
| if (isk->cmsg_flags) |
| ip_cmsg_recv(msg, skb); |
| err = copied; |
| |
| done: |
| skb_free_datagram(sk, skb); |
| out: |
| pr_debug("ping_recvmsg -> %d\n", err); |
| return err; |
| } |
| |
| static int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| { |
| pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n", |
| inet_sk(sk), inet_sk(sk)->inet_num, skb); |
| if (sock_queue_rcv_skb(sk, skb) < 0) { |
| ICMP_INC_STATS_BH(sock_net(sk), ICMP_MIB_INERRORS); |
| kfree_skb(skb); |
| pr_debug("ping_queue_rcv_skb -> failed\n"); |
| return -1; |
| } |
| return 0; |
| } |
| |
| |
| /* |
| * All we need to do is get the socket. |
| */ |
| |
| void ping_rcv(struct sk_buff *skb) |
| { |
| struct sock *sk; |
| struct net *net = dev_net(skb->dev); |
| struct iphdr *iph = ip_hdr(skb); |
| struct icmphdr *icmph = icmp_hdr(skb); |
| u32 saddr = iph->saddr; |
| u32 daddr = iph->daddr; |
| |
| /* We assume the packet has already been checked by icmp_rcv */ |
| |
| pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n", |
| skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence)); |
| |
| /* Push ICMP header back */ |
| skb_push(skb, skb->data - (u8 *)icmph); |
| |
| sk = ping_v4_lookup(net, saddr, daddr, ntohs(icmph->un.echo.id), |
| skb->dev->ifindex); |
| if (sk != NULL) { |
| pr_debug("rcv on socket %p\n", sk); |
| ping_queue_rcv_skb(sk, skb_get(skb)); |
| sock_put(sk); |
| return; |
| } |
| pr_debug("no socket, dropping\n"); |
| |
| /* We're called from icmp_rcv(). kfree_skb() is done there. */ |
| } |
| |
| struct proto ping_prot = { |
| .name = "PING", |
| .owner = THIS_MODULE, |
| .init = ping_init_sock, |
| .close = ping_close, |
| .connect = ip4_datagram_connect, |
| .disconnect = udp_disconnect, |
| .ioctl = ping_ioctl, |
| .setsockopt = ip_setsockopt, |
| .getsockopt = ip_getsockopt, |
| .sendmsg = ping_sendmsg, |
| .recvmsg = ping_recvmsg, |
| .bind = ping_bind, |
| .backlog_rcv = ping_queue_rcv_skb, |
| .hash = ping_v4_hash, |
| .unhash = ping_v4_unhash, |
| .get_port = ping_v4_get_port, |
| .obj_size = sizeof(struct inet_sock), |
| }; |
| EXPORT_SYMBOL(ping_prot); |
| |
| #ifdef CONFIG_PROC_FS |
| |
| static struct sock *ping_get_first(struct seq_file *seq, int start) |
| { |
| struct sock *sk; |
| struct ping_iter_state *state = seq->private; |
| struct net *net = seq_file_net(seq); |
| |
| for (state->bucket = start; state->bucket < PING_HTABLE_SIZE; |
| ++state->bucket) { |
| struct hlist_nulls_node *node; |
| struct hlist_nulls_head *hslot = &ping_table.hash[state->bucket]; |
| |
| if (hlist_nulls_empty(hslot)) |
| continue; |
| |
| sk_nulls_for_each(sk, node, hslot) { |
| if (net_eq(sock_net(sk), net)) |
| goto found; |
| } |
| } |
| sk = NULL; |
| found: |
| return sk; |
| } |
| |
| static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk) |
| { |
| struct ping_iter_state *state = seq->private; |
| struct net *net = seq_file_net(seq); |
| |
| do { |
| sk = sk_nulls_next(sk); |
| } while (sk && (!net_eq(sock_net(sk), net))); |
| |
| if (!sk) |
| return ping_get_first(seq, state->bucket + 1); |
| return sk; |
| } |
| |
| static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos) |
| { |
| struct sock *sk = ping_get_first(seq, 0); |
| |
| if (sk) |
| while (pos && (sk = ping_get_next(seq, sk)) != NULL) |
| --pos; |
| return pos ? NULL : sk; |
| } |
| |
| static void *ping_seq_start(struct seq_file *seq, loff_t *pos) |
| { |
| struct ping_iter_state *state = seq->private; |
| state->bucket = 0; |
| |
| read_lock_bh(&ping_table.lock); |
| |
| return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN; |
| } |
| |
| static void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct sock *sk; |
| |
| if (v == SEQ_START_TOKEN) |
| sk = ping_get_idx(seq, 0); |
| else |
| sk = ping_get_next(seq, v); |
| |
| ++*pos; |
| return sk; |
| } |
| |
| static void ping_seq_stop(struct seq_file *seq, void *v) |
| { |
| read_unlock_bh(&ping_table.lock); |
| } |
| |
| static void ping_format_sock(struct sock *sp, struct seq_file *f, |
| int bucket, int *len) |
| { |
| struct inet_sock *inet = inet_sk(sp); |
| __be32 dest = inet->inet_daddr; |
| __be32 src = inet->inet_rcv_saddr; |
| __u16 destp = ntohs(inet->inet_dport); |
| __u16 srcp = ntohs(inet->inet_sport); |
| |
| seq_printf(f, "%5d: %08X:%04X %08X:%04X" |
| " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d%n", |
| bucket, src, srcp, dest, destp, sp->sk_state, |
| sk_wmem_alloc_get(sp), |
| sk_rmem_alloc_get(sp), |
| 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), |
| atomic_read(&sp->sk_refcnt), sp, |
| atomic_read(&sp->sk_drops), len); |
| } |
| |
| static int ping_seq_show(struct seq_file *seq, void *v) |
| { |
| if (v == SEQ_START_TOKEN) |
| seq_printf(seq, "%-127s\n", |
| " sl local_address rem_address st tx_queue " |
| "rx_queue tr tm->when retrnsmt uid timeout " |
| "inode ref pointer drops"); |
| else { |
| struct ping_iter_state *state = seq->private; |
| int len; |
| |
| ping_format_sock(v, seq, state->bucket, &len); |
| seq_printf(seq, "%*s\n", 127 - len, ""); |
| } |
| return 0; |
| } |
| |
| static const struct seq_operations ping_seq_ops = { |
| .show = ping_seq_show, |
| .start = ping_seq_start, |
| .next = ping_seq_next, |
| .stop = ping_seq_stop, |
| }; |
| |
| static int ping_seq_open(struct inode *inode, struct file *file) |
| { |
| return seq_open_net(inode, file, &ping_seq_ops, |
| sizeof(struct ping_iter_state)); |
| } |
| |
| static const struct file_operations ping_seq_fops = { |
| .open = ping_seq_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release_net, |
| }; |
| |
| static int ping_proc_register(struct net *net) |
| { |
| struct proc_dir_entry *p; |
| int rc = 0; |
| |
| p = proc_net_fops_create(net, "icmp", S_IRUGO, &ping_seq_fops); |
| if (!p) |
| rc = -ENOMEM; |
| return rc; |
| } |
| |
| static void ping_proc_unregister(struct net *net) |
| { |
| proc_net_remove(net, "icmp"); |
| } |
| |
| |
| static int __net_init ping_proc_init_net(struct net *net) |
| { |
| return ping_proc_register(net); |
| } |
| |
| static void __net_exit ping_proc_exit_net(struct net *net) |
| { |
| ping_proc_unregister(net); |
| } |
| |
| static struct pernet_operations ping_net_ops = { |
| .init = ping_proc_init_net, |
| .exit = ping_proc_exit_net, |
| }; |
| |
| int __init ping_proc_init(void) |
| { |
| return register_pernet_subsys(&ping_net_ops); |
| } |
| |
| void ping_proc_exit(void) |
| { |
| unregister_pernet_subsys(&ping_net_ops); |
| } |
| |
| #endif |
| |
| void __init ping_init(void) |
| { |
| int i; |
| |
| for (i = 0; i < PING_HTABLE_SIZE; i++) |
| INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i); |
| rwlock_init(&ping_table.lock); |
| } |