diff options
Diffstat (limited to '')
| -rw-r--r-- | net/ipv4/raw.c | 1112 |
1 files changed, 1112 insertions, 0 deletions
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c new file mode 100644 index 000000000..639aa5abd --- /dev/null +++ b/net/ipv4/raw.c @@ -0,0 +1,1112 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * 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. + * + * RAW - implementation of IP "raw" sockets. + * + * Authors: Ross Biro + * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> + * + * Fixes: + * Alan Cox : verify_area() fixed up + * Alan Cox : ICMP error handling + * Alan Cox : EMSGSIZE if you send too big a packet + * Alan Cox : Now uses generic datagrams and shared + * skbuff library. No more peek crashes, + * no more backlogs + * Alan Cox : Checks sk->broadcast. + * Alan Cox : Uses skb_free_datagram/skb_copy_datagram + * Alan Cox : Raw passes ip options too + * Alan Cox : Setsocketopt added + * Alan Cox : Fixed error return for broadcasts + * Alan Cox : Removed wake_up calls + * Alan Cox : Use ttl/tos + * Alan Cox : Cleaned up old debugging + * Alan Cox : Use new kernel side addresses + * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets. + * Alan Cox : BSD style RAW socket demultiplexing. + * Alan Cox : Beginnings of mrouted support. + * Alan Cox : Added IP_HDRINCL option. + * Alan Cox : Skip broadcast check if BSDism set. + * David S. Miller : New socket lookup architecture. + */ + +#include <linux/types.h> +#include <linux/atomic.h> +#include <asm/byteorder.h> +#include <asm/current.h> +#include <linux/uaccess.h> +#include <asm/ioctls.h> +#include <linux/stddef.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/export.h> +#include <linux/spinlock.h> +#include <linux/sockios.h> +#include <linux/socket.h> +#include <linux/in.h> +#include <linux/mroute.h> +#include <linux/netdevice.h> +#include <linux/in_route.h> +#include <linux/route.h> +#include <linux/skbuff.h> +#include <linux/igmp.h> +#include <net/net_namespace.h> +#include <net/dst.h> +#include <net/sock.h> +#include <linux/ip.h> +#include <linux/net.h> +#include <net/ip.h> +#include <net/icmp.h> +#include <net/udp.h> +#include <net/raw.h> +#include <net/snmp.h> +#include <net/tcp_states.h> +#include <net/inet_common.h> +#include <net/checksum.h> +#include <net/xfrm.h> +#include <linux/rtnetlink.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/netfilter.h> +#include <linux/netfilter_ipv4.h> +#include <linux/compat.h> +#include <linux/uio.h> + +struct raw_frag_vec { + struct msghdr *msg; + union { + struct icmphdr icmph; + char c[1]; + } hdr; + int hlen; +}; + +struct raw_hashinfo raw_v4_hashinfo; +EXPORT_SYMBOL_GPL(raw_v4_hashinfo); + +int raw_hash_sk(struct sock *sk) +{ + struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; + struct hlist_head *hlist; + + hlist = &h->ht[raw_hashfunc(sock_net(sk), inet_sk(sk)->inet_num)]; + + spin_lock(&h->lock); + sk_add_node_rcu(sk, hlist); + sock_set_flag(sk, SOCK_RCU_FREE); + spin_unlock(&h->lock); + sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); + + return 0; +} +EXPORT_SYMBOL_GPL(raw_hash_sk); + +void raw_unhash_sk(struct sock *sk) +{ + struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; + + spin_lock(&h->lock); + if (sk_del_node_init_rcu(sk)) + sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); + spin_unlock(&h->lock); +} +EXPORT_SYMBOL_GPL(raw_unhash_sk); + +bool raw_v4_match(struct net *net, struct sock *sk, unsigned short num, + __be32 raddr, __be32 laddr, int dif, int sdif) +{ + struct inet_sock *inet = inet_sk(sk); + + if (net_eq(sock_net(sk), net) && inet->inet_num == num && + !(inet->inet_daddr && inet->inet_daddr != raddr) && + !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) && + raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif)) + return true; + return false; +} +EXPORT_SYMBOL_GPL(raw_v4_match); + +/* + * 0 - deliver + * 1 - block + */ +static int icmp_filter(const struct sock *sk, const struct sk_buff *skb) +{ + struct icmphdr _hdr; + const struct icmphdr *hdr; + + hdr = skb_header_pointer(skb, skb_transport_offset(skb), + sizeof(_hdr), &_hdr); + if (!hdr) + return 1; + + if (hdr->type < 32) { + __u32 data = raw_sk(sk)->filter.data; + + return ((1U << hdr->type) & data) != 0; + } + + /* Do not block unknown ICMP types */ + return 0; +} + +/* IP input processing comes here for RAW socket delivery. + * Caller owns SKB, so we must make clones. + * + * RFC 1122: SHOULD pass TOS value up to the transport layer. + * -> It does. And not only TOS, but all IP header. + */ +static int raw_v4_input(struct net *net, struct sk_buff *skb, + const struct iphdr *iph, int hash) +{ + int sdif = inet_sdif(skb); + struct hlist_head *hlist; + int dif = inet_iif(skb); + int delivered = 0; + struct sock *sk; + + hlist = &raw_v4_hashinfo.ht[hash]; + rcu_read_lock(); + sk_for_each_rcu(sk, hlist) { + if (!raw_v4_match(net, sk, iph->protocol, + iph->saddr, iph->daddr, dif, sdif)) + continue; + delivered = 1; + if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) && + ip_mc_sf_allow(sk, iph->daddr, iph->saddr, + skb->dev->ifindex, sdif)) { + struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); + + /* Not releasing hash table! */ + if (clone) + raw_rcv(sk, clone); + } + } + rcu_read_unlock(); + return delivered; +} + +int raw_local_deliver(struct sk_buff *skb, int protocol) +{ + struct net *net = dev_net(skb->dev); + + return raw_v4_input(net, skb, ip_hdr(skb), + raw_hashfunc(net, protocol)); +} + +static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info) +{ + struct inet_sock *inet = inet_sk(sk); + const int type = icmp_hdr(skb)->type; + const int code = icmp_hdr(skb)->code; + int err = 0; + int harderr = 0; + + if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) + ipv4_sk_update_pmtu(skb, sk, info); + else if (type == ICMP_REDIRECT) { + ipv4_sk_redirect(skb, sk); + return; + } + + /* Report error on raw socket, if: + 1. User requested ip_recverr. + 2. Socket is connected (otherwise the error indication + is useless without ip_recverr and error is hard. + */ + if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED) + return; + + switch (type) { + default: + case ICMP_TIME_EXCEEDED: + err = EHOSTUNREACH; + break; + case ICMP_SOURCE_QUENCH: + return; + case ICMP_PARAMETERPROB: + err = EPROTO; + harderr = 1; + break; + case ICMP_DEST_UNREACH: + err = EHOSTUNREACH; + if (code > NR_ICMP_UNREACH) + break; + if (code == ICMP_FRAG_NEEDED) { + harderr = inet->pmtudisc != IP_PMTUDISC_DONT; + err = EMSGSIZE; + } else { + err = icmp_err_convert[code].errno; + harderr = icmp_err_convert[code].fatal; + } + } + + if (inet->recverr) { + const struct iphdr *iph = (const struct iphdr *)skb->data; + u8 *payload = skb->data + (iph->ihl << 2); + + if (inet->hdrincl) + payload = skb->data; + ip_icmp_error(sk, skb, err, 0, info, payload); + } + + if (inet->recverr || harderr) { + sk->sk_err = err; + sk_error_report(sk); + } +} + +void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info) +{ + struct net *net = dev_net(skb->dev); + int dif = skb->dev->ifindex; + int sdif = inet_sdif(skb); + struct hlist_head *hlist; + const struct iphdr *iph; + struct sock *sk; + int hash; + + hash = raw_hashfunc(net, protocol); + hlist = &raw_v4_hashinfo.ht[hash]; + + rcu_read_lock(); + sk_for_each_rcu(sk, hlist) { + iph = (const struct iphdr *)skb->data; + if (!raw_v4_match(net, sk, iph->protocol, + iph->daddr, iph->saddr, dif, sdif)) + continue; + raw_err(sk, skb, info); + } + rcu_read_unlock(); +} + +static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb) +{ + /* Charge it to the socket. */ + + ipv4_pktinfo_prepare(sk, skb); + if (sock_queue_rcv_skb(sk, skb) < 0) { + kfree_skb(skb); + return NET_RX_DROP; + } + + return NET_RX_SUCCESS; +} + +int raw_rcv(struct sock *sk, struct sk_buff *skb) +{ + if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { + atomic_inc(&sk->sk_drops); + kfree_skb(skb); + return NET_RX_DROP; + } + nf_reset_ct(skb); + + skb_push(skb, skb->data - skb_network_header(skb)); + + raw_rcv_skb(sk, skb); + return 0; +} + +static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4, + struct msghdr *msg, size_t length, + struct rtable **rtp, unsigned int flags, + const struct sockcm_cookie *sockc) +{ + struct inet_sock *inet = inet_sk(sk); + struct net *net = sock_net(sk); + struct iphdr *iph; + struct sk_buff *skb; + unsigned int iphlen; + int err; + struct rtable *rt = *rtp; + int hlen, tlen; + + if (length > rt->dst.dev->mtu) { + ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, + rt->dst.dev->mtu); + return -EMSGSIZE; + } + if (length < sizeof(struct iphdr)) + return -EINVAL; + + if (flags&MSG_PROBE) + goto out; + + hlen = LL_RESERVED_SPACE(rt->dst.dev); + tlen = rt->dst.dev->needed_tailroom; + skb = sock_alloc_send_skb(sk, + length + hlen + tlen + 15, + flags & MSG_DONTWAIT, &err); + if (!skb) + goto error; + skb_reserve(skb, hlen); + + skb->priority = READ_ONCE(sk->sk_priority); + skb->mark = sockc->mark; + skb->tstamp = sockc->transmit_time; + skb_dst_set(skb, &rt->dst); + *rtp = NULL; + + skb_reset_network_header(skb); + iph = ip_hdr(skb); + skb_put(skb, length); + + skb->ip_summed = CHECKSUM_NONE; + + skb_setup_tx_timestamp(skb, sockc->tsflags); + + if (flags & MSG_CONFIRM) + skb_set_dst_pending_confirm(skb, 1); + + skb->transport_header = skb->network_header; + err = -EFAULT; + if (memcpy_from_msg(iph, msg, length)) + goto error_free; + + iphlen = iph->ihl * 4; + + /* + * We don't want to modify the ip header, but we do need to + * be sure that it won't cause problems later along the network + * stack. Specifically we want to make sure that iph->ihl is a + * sane value. If ihl points beyond the length of the buffer passed + * in, reject the frame as invalid + */ + err = -EINVAL; + if (iphlen > length) + goto error_free; + + if (iphlen >= sizeof(*iph)) { + if (!iph->saddr) + iph->saddr = fl4->saddr; + iph->check = 0; + iph->tot_len = htons(length); + if (!iph->id) + ip_select_ident(net, skb, NULL); + + iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); + skb->transport_header += iphlen; + if (iph->protocol == IPPROTO_ICMP && + length >= iphlen + sizeof(struct icmphdr)) + icmp_out_count(net, ((struct icmphdr *) + skb_transport_header(skb))->type); + } + + err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, + net, sk, skb, NULL, rt->dst.dev, + dst_output); + if (err > 0) + err = net_xmit_errno(err); + if (err) + goto error; +out: + return 0; + +error_free: + kfree_skb(skb); +error: + IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); + if (err == -ENOBUFS && !inet->recverr) + err = 0; + return err; +} + +static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4) +{ + int err; + + if (fl4->flowi4_proto != IPPROTO_ICMP) + return 0; + + /* We only need the first two bytes. */ + rfv->hlen = 2; + + err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen); + if (err) + return err; + + fl4->fl4_icmp_type = rfv->hdr.icmph.type; + fl4->fl4_icmp_code = rfv->hdr.icmph.code; + + return 0; +} + +static int raw_getfrag(void *from, char *to, int offset, int len, int odd, + struct sk_buff *skb) +{ + struct raw_frag_vec *rfv = from; + + if (offset < rfv->hlen) { + int copy = min(rfv->hlen - offset, len); + + if (skb->ip_summed == CHECKSUM_PARTIAL) + memcpy(to, rfv->hdr.c + offset, copy); + else + skb->csum = csum_block_add( + skb->csum, + csum_partial_copy_nocheck(rfv->hdr.c + offset, + to, copy), + odd); + + odd = 0; + offset += copy; + to += copy; + len -= copy; + + if (!len) + return 0; + } + + offset -= rfv->hlen; + + return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); +} + +static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) +{ + struct inet_sock *inet = inet_sk(sk); + struct net *net = sock_net(sk); + struct ipcm_cookie ipc; + struct rtable *rt = NULL; + struct flowi4 fl4; + int free = 0; + __be32 daddr; + __be32 saddr; + u8 tos; + int err; + struct ip_options_data opt_copy; + struct raw_frag_vec rfv; + int hdrincl; + + err = -EMSGSIZE; + if (len > 0xFFFF) + goto out; + + /* hdrincl should be READ_ONCE(inet->hdrincl) + * but READ_ONCE() doesn't work with bit fields. + * Doing this indirectly yields the same result. + */ + hdrincl = inet->hdrincl; + hdrincl = READ_ONCE(hdrincl); + /* + * Check the flags. + */ + + err = -EOPNOTSUPP; + if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ + goto out; /* compatibility */ + + /* + * Get and verify the address. + */ + + if (msg->msg_namelen) { + DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); + err = -EINVAL; + if (msg->msg_namelen < sizeof(*usin)) + goto out; + if (usin->sin_family != AF_INET) { + pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n", + __func__, current->comm); + err = -EAFNOSUPPORT; + if (usin->sin_family) + goto out; + } + daddr = usin->sin_addr.s_addr; + /* ANK: I did not forget to get protocol from port field. + * I just do not know, who uses this weirdness. + * IP_HDRINCL is much more convenient. + */ + } else { + err = -EDESTADDRREQ; + if (sk->sk_state != TCP_ESTABLISHED) + goto out; + daddr = inet->inet_daddr; + } + + ipcm_init_sk(&ipc, inet); + /* Keep backward compat */ + if (hdrincl) + ipc.protocol = IPPROTO_RAW; + + if (msg->msg_controllen) { + err = ip_cmsg_send(sk, msg, &ipc, false); + if (unlikely(err)) { + kfree(ipc.opt); + goto out; + } + if (ipc.opt) + free = 1; + } + + saddr = ipc.addr; + ipc.addr = daddr; + + 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(); + } + + if (ipc.opt) { + err = -EINVAL; + /* Linux does not mangle headers on raw sockets, + * so that IP options + IP_HDRINCL is non-sense. + */ + if (hdrincl) + goto done; + if (ipc.opt->opt.srr) { + if (!daddr) + goto done; + daddr = ipc.opt->opt.faddr; + } + } + tos = get_rtconn_flags(&ipc, sk); + if (msg->msg_flags & MSG_DONTROUTE) + tos |= RTO_ONLINK; + + if (ipv4_is_multicast(daddr)) { + if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif)) + ipc.oif = inet->mc_index; + if (!saddr) + saddr = inet->mc_addr; + } else if (!ipc.oif) { + ipc.oif = inet->uc_index; + } else if (ipv4_is_lbcast(daddr) && inet->uc_index) { + /* oif is set, packet is to local broadcast + * and uc_index is set. oif is most likely set + * by sk_bound_dev_if. If uc_index != oif check if the + * oif is an L3 master and uc_index is an L3 slave. + * If so, we want to allow the send using the uc_index. + */ + if (ipc.oif != inet->uc_index && + ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk), + inet->uc_index)) { + ipc.oif = inet->uc_index; + } + } + + flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos, + RT_SCOPE_UNIVERSE, + hdrincl ? ipc.protocol : sk->sk_protocol, + inet_sk_flowi_flags(sk) | + (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0), + daddr, saddr, 0, 0, sk->sk_uid); + + if (!hdrincl) { + rfv.msg = msg; + rfv.hlen = 0; + + err = raw_probe_proto_opt(&rfv, &fl4); + if (err) + goto done; + } + + security_sk_classify_flow(sk, flowi4_to_flowi_common(&fl4)); + rt = ip_route_output_flow(net, &fl4, sk); + if (IS_ERR(rt)) { + err = PTR_ERR(rt); + rt = NULL; + goto done; + } + + err = -EACCES; + if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) + goto done; + + if (msg->msg_flags & MSG_CONFIRM) + goto do_confirm; +back_from_confirm: + + if (hdrincl) + err = raw_send_hdrinc(sk, &fl4, msg, len, + &rt, msg->msg_flags, &ipc.sockc); + + else { + if (!ipc.addr) + ipc.addr = fl4.daddr; + lock_sock(sk); + err = ip_append_data(sk, &fl4, raw_getfrag, + &rfv, len, 0, + &ipc, &rt, msg->msg_flags); + if (err) + ip_flush_pending_frames(sk); + else if (!(msg->msg_flags & MSG_MORE)) { + err = ip_push_pending_frames(sk, &fl4); + if (err == -ENOBUFS && !inet->recverr) + err = 0; + } + release_sock(sk); + } +done: + if (free) + kfree(ipc.opt); + ip_rt_put(rt); + +out: + if (err < 0) + return err; + return len; + +do_confirm: + if (msg->msg_flags & MSG_PROBE) + dst_confirm_neigh(&rt->dst, &fl4.daddr); + if (!(msg->msg_flags & MSG_PROBE) || len) + goto back_from_confirm; + err = 0; + goto done; +} + +static void raw_close(struct sock *sk, long timeout) +{ + /* + * Raw sockets may have direct kernel references. Kill them. + */ + ip_ra_control(sk, 0, NULL); + + sk_common_release(sk); +} + +static void raw_destroy(struct sock *sk) +{ + lock_sock(sk); + ip_flush_pending_frames(sk); + release_sock(sk); +} + +/* This gets rid of all the nasties in af_inet. -DaveM */ +static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) +{ + struct inet_sock *inet = inet_sk(sk); + struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; + struct net *net = sock_net(sk); + u32 tb_id = RT_TABLE_LOCAL; + int ret = -EINVAL; + int chk_addr_ret; + + lock_sock(sk); + if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) + goto out; + + if (sk->sk_bound_dev_if) + tb_id = l3mdev_fib_table_by_index(net, + sk->sk_bound_dev_if) ? : tb_id; + + chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); + + ret = -EADDRNOTAVAIL; + if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr, + chk_addr_ret)) + goto out; + + inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; + if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) + inet->inet_saddr = 0; /* Use device */ + sk_dst_reset(sk); + ret = 0; +out: + release_sock(sk); + return ret; +} + +/* + * This should be easy, if there is something there + * we return it, otherwise we block. + */ + +static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, + int flags, int *addr_len) +{ + struct inet_sock *inet = inet_sk(sk); + size_t copied = 0; + int err = -EOPNOTSUPP; + DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); + struct sk_buff *skb; + + if (flags & MSG_OOB) + goto out; + + if (flags & MSG_ERRQUEUE) { + err = ip_recv_error(sk, msg, len, addr_len); + goto out; + } + + skb = skb_recv_datagram(sk, flags, &err); + if (!skb) + goto out; + + copied = skb->len; + if (len < copied) { + msg->msg_flags |= MSG_TRUNC; + copied = len; + } + + err = skb_copy_datagram_msg(skb, 0, msg, copied); + if (err) + goto done; + + sock_recv_cmsgs(msg, sk, skb); + + /* Copy the address. */ + if (sin) { + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = ip_hdr(skb)->saddr; + sin->sin_port = 0; + memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); + *addr_len = sizeof(*sin); + } + if (inet->cmsg_flags) + ip_cmsg_recv(msg, skb); + if (flags & MSG_TRUNC) + copied = skb->len; +done: + skb_free_datagram(sk, skb); +out: + if (err) + return err; + return copied; +} + +static int raw_sk_init(struct sock *sk) +{ + struct raw_sock *rp = raw_sk(sk); + + if (inet_sk(sk)->inet_num == IPPROTO_ICMP) + memset(&rp->filter, 0, sizeof(rp->filter)); + return 0; +} + +static int raw_seticmpfilter(struct sock *sk, sockptr_t optval, int optlen) +{ + if (optlen > sizeof(struct icmp_filter)) + optlen = sizeof(struct icmp_filter); + if (copy_from_sockptr(&raw_sk(sk)->filter, optval, optlen)) + return -EFAULT; + return 0; +} + +static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) +{ + int len, ret = -EFAULT; + + if (get_user(len, optlen)) + goto out; + ret = -EINVAL; + if (len < 0) + goto out; + if (len > sizeof(struct icmp_filter)) + len = sizeof(struct icmp_filter); + ret = -EFAULT; + if (put_user(len, optlen) || + copy_to_user(optval, &raw_sk(sk)->filter, len)) + goto out; + ret = 0; +out: return ret; +} + +static int do_raw_setsockopt(struct sock *sk, int level, int optname, + sockptr_t optval, unsigned int optlen) +{ + if (optname == ICMP_FILTER) { + if (inet_sk(sk)->inet_num != IPPROTO_ICMP) + return -EOPNOTSUPP; + else + return raw_seticmpfilter(sk, optval, optlen); + } + return -ENOPROTOOPT; +} + +static int raw_setsockopt(struct sock *sk, int level, int optname, + sockptr_t optval, unsigned int optlen) +{ + if (level != SOL_RAW) + return ip_setsockopt(sk, level, optname, optval, optlen); + return do_raw_setsockopt(sk, level, optname, optval, optlen); +} + +static int do_raw_getsockopt(struct sock *sk, int level, int optname, + char __user *optval, int __user *optlen) +{ + if (optname == ICMP_FILTER) { + if (inet_sk(sk)->inet_num != IPPROTO_ICMP) + return -EOPNOTSUPP; + else + return raw_geticmpfilter(sk, optval, optlen); + } + return -ENOPROTOOPT; +} + +static int raw_getsockopt(struct sock *sk, int level, int optname, + char __user *optval, int __user *optlen) +{ + if (level != SOL_RAW) + return ip_getsockopt(sk, level, optname, optval, optlen); + return do_raw_getsockopt(sk, level, optname, optval, optlen); +} + +static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) +{ + switch (cmd) { + case SIOCOUTQ: { + int amount = sk_wmem_alloc_get(sk); + + return put_user(amount, (int __user *)arg); + } + case SIOCINQ: { + struct sk_buff *skb; + int amount = 0; + + spin_lock_bh(&sk->sk_receive_queue.lock); + skb = skb_peek(&sk->sk_receive_queue); + if (skb) + amount = skb->len; + spin_unlock_bh(&sk->sk_receive_queue.lock); + return put_user(amount, (int __user *)arg); + } + + default: +#ifdef CONFIG_IP_MROUTE + return ipmr_ioctl(sk, cmd, (void __user *)arg); +#else + return -ENOIOCTLCMD; +#endif + } +} + +#ifdef CONFIG_COMPAT +static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) +{ + switch (cmd) { + case SIOCOUTQ: + case SIOCINQ: + return -ENOIOCTLCMD; + default: +#ifdef CONFIG_IP_MROUTE + return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg)); +#else + return -ENOIOCTLCMD; +#endif + } +} +#endif + +int raw_abort(struct sock *sk, int err) +{ + lock_sock(sk); + + sk->sk_err = err; + sk_error_report(sk); + __udp_disconnect(sk, 0); + + release_sock(sk); + + return 0; +} +EXPORT_SYMBOL_GPL(raw_abort); + +struct proto raw_prot = { + .name = "RAW", + .owner = THIS_MODULE, + .close = raw_close, + .destroy = raw_destroy, + .connect = ip4_datagram_connect, + .disconnect = __udp_disconnect, + .ioctl = raw_ioctl, + .init = raw_sk_init, + .setsockopt = raw_setsockopt, + .getsockopt = raw_getsockopt, + .sendmsg = raw_sendmsg, + .recvmsg = raw_recvmsg, + .bind = raw_bind, + .backlog_rcv = raw_rcv_skb, + .release_cb = ip4_datagram_release_cb, + .hash = raw_hash_sk, + .unhash = raw_unhash_sk, + .obj_size = sizeof(struct raw_sock), + .useroffset = offsetof(struct raw_sock, filter), + .usersize = sizeof_field(struct raw_sock, filter), + .h.raw_hash = &raw_v4_hashinfo, +#ifdef CONFIG_COMPAT + .compat_ioctl = compat_raw_ioctl, +#endif + .diag_destroy = raw_abort, +}; + +#ifdef CONFIG_PROC_FS +static struct sock *raw_get_first(struct seq_file *seq, int bucket) +{ + struct raw_hashinfo *h = pde_data(file_inode(seq->file)); + struct raw_iter_state *state = raw_seq_private(seq); + struct hlist_head *hlist; + struct sock *sk; + + for (state->bucket = bucket; state->bucket < RAW_HTABLE_SIZE; + ++state->bucket) { + hlist = &h->ht[state->bucket]; + sk_for_each(sk, hlist) { + if (sock_net(sk) == seq_file_net(seq)) + return sk; + } + } + return NULL; +} + +static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) +{ + struct raw_iter_state *state = raw_seq_private(seq); + + do { + sk = sk_next(sk); + } while (sk && sock_net(sk) != seq_file_net(seq)); + + if (!sk) + return raw_get_first(seq, state->bucket + 1); + return sk; +} + +static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) +{ + struct sock *sk = raw_get_first(seq, 0); + + if (sk) + while (pos && (sk = raw_get_next(seq, sk)) != NULL) + --pos; + return pos ? NULL : sk; +} + +void *raw_seq_start(struct seq_file *seq, loff_t *pos) + __acquires(&h->lock) +{ + struct raw_hashinfo *h = pde_data(file_inode(seq->file)); + + spin_lock(&h->lock); + + return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; +} +EXPORT_SYMBOL_GPL(raw_seq_start); + +void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct sock *sk; + + if (v == SEQ_START_TOKEN) + sk = raw_get_first(seq, 0); + else + sk = raw_get_next(seq, v); + ++*pos; + return sk; +} +EXPORT_SYMBOL_GPL(raw_seq_next); + +void raw_seq_stop(struct seq_file *seq, void *v) + __releases(&h->lock) +{ + struct raw_hashinfo *h = pde_data(file_inode(seq->file)); + + spin_unlock(&h->lock); +} +EXPORT_SYMBOL_GPL(raw_seq_stop); + +static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) +{ + struct inet_sock *inet = inet_sk(sp); + __be32 dest = inet->inet_daddr, + src = inet->inet_rcv_saddr; + __u16 destp = 0, + srcp = inet->inet_num; + + seq_printf(seq, "%4d: %08X:%04X %08X:%04X" + " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n", + i, src, srcp, dest, destp, sp->sk_state, + sk_wmem_alloc_get(sp), + sk_rmem_alloc_get(sp), + 0, 0L, 0, + from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), + 0, sock_i_ino(sp), + refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); +} + +static int raw_seq_show(struct seq_file *seq, void *v) +{ + if (v == SEQ_START_TOKEN) + seq_printf(seq, " sl local_address rem_address st tx_queue " + "rx_queue tr tm->when retrnsmt uid timeout " + "inode ref pointer drops\n"); + else + raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); + return 0; +} + +static const struct seq_operations raw_seq_ops = { + .start = raw_seq_start, + .next = raw_seq_next, + .stop = raw_seq_stop, + .show = raw_seq_show, +}; + +static __net_init int raw_init_net(struct net *net) +{ + if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops, + sizeof(struct raw_iter_state), &raw_v4_hashinfo)) + return -ENOMEM; + + return 0; +} + +static __net_exit void raw_exit_net(struct net *net) +{ + remove_proc_entry("raw", net->proc_net); +} + +static __net_initdata struct pernet_operations raw_net_ops = { + .init = raw_init_net, + .exit = raw_exit_net, +}; + +int __init raw_proc_init(void) +{ + + return register_pernet_subsys(&raw_net_ops); +} + +void __init raw_proc_exit(void) +{ + unregister_pernet_subsys(&raw_net_ops); +} +#endif /* CONFIG_PROC_FS */ + +static void raw_sysctl_init_net(struct net *net) +{ +#ifdef CONFIG_NET_L3_MASTER_DEV + net->ipv4.sysctl_raw_l3mdev_accept = 1; +#endif +} + +static int __net_init raw_sysctl_init(struct net *net) +{ + raw_sysctl_init_net(net); + return 0; +} + +static struct pernet_operations __net_initdata raw_sysctl_ops = { + .init = raw_sysctl_init, +}; + +void __init raw_init(void) +{ + raw_sysctl_init_net(&init_net); + if (register_pernet_subsys(&raw_sysctl_ops)) + panic("RAW: failed to init sysctl parameters.\n"); +} |