/* * 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 <linux/uaccess.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 <linux/export.h>#include <net/sock.h>#include <net/ping.h>#include <net/udp.h>#include <net/route.h>#include <net/inet_common.h>#include <net/checksum.h> static struct ping_table ping_table; static u16 ping_port_rover; static inline int ping_hashfn(struct net *net, unsigned int num, unsigned int 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 int 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)) { write_lock_bh(&ping_table.lock); hlist_nulls_del(&sk->sk_nulls_node); sock_put(sk); isk->inet_num = 0; isk->inet_sport = 0; sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); write_unlock_bh(&ping_table.lock); }} static struct sock *ping_v4_lookup(struct net *net, __be32 saddr, __be32 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 = %pI4, dif = %d\n", (int)ident, &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 = %pI4, dif = %d\n", sk, (int)isk->inet_num, &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 void inet_get_ping_group_range_net(struct net *net, gid_t *low, gid_t *high){ gid_t *data = net->ipv4.sysctl_ping_group_range; unsigned int seq; do { seq = read_seqbegin(&sysctl_local_ports.lock); *low = data[0]; *high = data[1]; } while (read_seqretry(&sysctl_local_ports.lock, seq));} 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; kgid_t low, high; inet_get_ping_group_range_net(net, range, range+1); low = make_kgid(&init_user_ns, range[0]); high = make_kgid(&init_user_ns, range[1]); if (!gid_valid(low) || !gid_valid(high) || gid_lt(high, low)) return -EACCES; 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++) { kgid_t gid = group_info->blocks[i][j]; if (gid_lte(low, gid) && gid_lte(gid, high)) 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 == htonl(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 = %pI4, dif = %d\n", (int)isk->inet_num, &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) { 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; __wsum 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);} static 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; __be32 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. */Lines 1–500 of 939. 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/* * 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 <linux/uaccess.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 <linux/export.h> #include <net/sock.h> #include <net/ping.h> #include <net/udp.h> #include <net/route.h> #include <net/inet_common.h> #include <net/checksum.h> static struct ping_table ping_table; static u16 ping_port_rover; static inline int ping_hashfn(struct net *net, unsigned int num, unsigned int 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 int 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)) { write_lock_bh(&ping_table.lock); hlist_nulls_del(&sk->sk_nulls_node); sock_put(sk); isk->inet_num = 0; isk->inet_sport = 0; sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); write_unlock_bh(&ping_table.lock); } } static struct sock *ping_v4_lookup(struct net *net, __be32 saddr, __be32 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 = %pI4, dif = %d\n", (int)ident, &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 = %pI4, dif = %d\n", sk, (int)isk->inet_num, &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 void inet_get_ping_group_range_net(struct net *net, gid_t *low, gid_t *high) { gid_t *data = net->ipv4.sysctl_ping_group_range; unsigned int seq; do { seq = read_seqbegin(&sysctl_local_ports.lock); *low = data[0]; *high = data[1]; } while (read_seqretry(&sysctl_local_ports.lock, seq)); } 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; kgid_t low, high; inet_get_ping_group_range_net(net, range, range+1); low = make_kgid(&init_user_ns, range[0]); high = make_kgid(&init_user_ns, range[1]); if (!gid_valid(low) || !gid_valid(high) || gid_lt(high, low)) return -EACCES; 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++) { kgid_t gid = group_info->blocks[i][j]; if (gid_lte(low, gid) && gid_lte(gid, high)) 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 == htonl(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 = %pI4, dif = %d\n", (int)isk->inet_num, &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) { 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; __wsum 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); } static 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; __be32 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. */