summaryrefslogtreecommitdiffstats
path: root/net/ipv4/raw.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv4/raw.c')
-rw-r--r--net/ipv4/raw.c1142
1 files changed, 1142 insertions, 0 deletions
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
new file mode 100644
index 000000000..650da4d8f
--- /dev/null
+++ b/net/ipv4/raw.c
@@ -0,0 +1,1142 @@
+// 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 = {
+ .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock),
+};
+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 *head;
+
+ head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)];
+
+ write_lock_bh(&h->lock);
+ sk_add_node(sk, head);
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
+ write_unlock_bh(&h->lock);
+
+ 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;
+
+ write_lock_bh(&h->lock);
+ if (sk_del_node_init(sk))
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
+ write_unlock_bh(&h->lock);
+}
+EXPORT_SYMBOL_GPL(raw_unhash_sk);
+
+struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
+ unsigned short num, __be32 raddr, __be32 laddr,
+ int dif, int sdif)
+{
+ sk_for_each_from(sk) {
+ 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))
+ goto found; /* gotcha */
+ }
+ sk = NULL;
+found:
+ return sk;
+}
+EXPORT_SYMBOL_GPL(__raw_v4_lookup);
+
+/*
+ * 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 sk_buff *skb, const struct iphdr *iph, int hash)
+{
+ int sdif = inet_sdif(skb);
+ int dif = inet_iif(skb);
+ struct sock *sk;
+ struct hlist_head *head;
+ int delivered = 0;
+ struct net *net;
+
+ read_lock(&raw_v4_hashinfo.lock);
+ head = &raw_v4_hashinfo.ht[hash];
+ if (hlist_empty(head))
+ goto out;
+
+ net = dev_net(skb->dev);
+ sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
+ iph->saddr, iph->daddr, dif, sdif);
+
+ while (sk) {
+ 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);
+ }
+ sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
+ iph->saddr, iph->daddr,
+ dif, sdif);
+ }
+out:
+ read_unlock(&raw_v4_hashinfo.lock);
+ return delivered;
+}
+
+int raw_local_deliver(struct sk_buff *skb, int protocol)
+{
+ int hash;
+ struct sock *raw_sk;
+
+ hash = protocol & (RAW_HTABLE_SIZE - 1);
+ raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
+
+ /* If there maybe a raw socket we must check - if not we
+ * don't care less
+ */
+ if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
+ raw_sk = NULL;
+
+ return raw_sk != NULL;
+
+}
+
+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->sk_error_report(sk);
+ }
+}
+
+void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
+{
+ int hash;
+ struct sock *raw_sk;
+ const struct iphdr *iph;
+ struct net *net;
+
+ hash = protocol & (RAW_HTABLE_SIZE - 1);
+
+ read_lock(&raw_v4_hashinfo.lock);
+ raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
+ if (raw_sk) {
+ int dif = skb->dev->ifindex;
+ int sdif = inet_sdif(skb);
+
+ iph = (const struct iphdr *)skb->data;
+ net = dev_net(skb->dev);
+
+ while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
+ iph->daddr, iph->saddr,
+ dif, sdif)) != NULL) {
+ raw_err(raw_sk, skb, info);
+ raw_sk = sk_next(raw_sk);
+ iph = (const struct iphdr *)skb->data;
+ }
+ }
+ read_unlock(&raw_v4_hashinfo.lock);
+}
+
+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 = 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;
+ 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(sock_net(sk),
+ sk->sk_bound_dev_if) ? : tb_id;
+
+ chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr,
+ tb_id);
+
+ ret = -EADDRNOTAVAIL;
+ if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
+ chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
+ 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 noblock, 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, noblock, &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_ts_and_drops(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->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)
+{
+ struct sock *sk;
+ struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
+ struct raw_iter_state *state = raw_seq_private(seq);
+
+ for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
+ ++state->bucket) {
+ sk_for_each(sk, &h->ht[state->bucket])
+ if (sock_net(sk) == seq_file_net(seq))
+ goto found;
+ }
+ sk = NULL;
+found:
+ return sk;
+}
+
+static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
+{
+ struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file));
+ struct raw_iter_state *state = raw_seq_private(seq);
+
+ do {
+ sk = sk_next(sk);
+try_again:
+ ;
+ } while (sk && sock_net(sk) != seq_file_net(seq));
+
+ if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
+ sk = sk_head(&h->ht[state->bucket]);
+ goto try_again;
+ }
+ return sk;
+}
+
+static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
+{
+ struct sock *sk = raw_get_first(seq);
+
+ 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));
+
+ read_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);
+ 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));
+
+ read_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");
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 17:41:29 +0000