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-rw-r--r--net/ipv6/raw.c1370
1 files changed, 1370 insertions, 0 deletions
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
new file mode 100644
index 00000000..cc7313b8
--- /dev/null
+++ b/net/ipv6/raw.c
@@ -0,0 +1,1370 @@
+/*
+ * RAW sockets for IPv6
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * Adapted from linux/net/ipv4/raw.c
+ *
+ * Fixes:
+ * Hideaki YOSHIFUJI : sin6_scope_id support
+ * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
+ * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
+ *
+ * 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.
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/slab.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/icmpv6.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/skbuff.h>
+#include <linux/compat.h>
+#include <asm/uaccess.h>
+#include <asm/ioctls.h>
+
+#include <net/net_namespace.h>
+#include <net/ip.h>
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/protocol.h>
+#include <net/ip6_route.h>
+#include <net/ip6_checksum.h>
+#include <net/addrconf.h>
+#include <net/transp_v6.h>
+#include <net/udp.h>
+#include <net/inet_common.h>
+#include <net/tcp_states.h>
+#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
+#include <net/mip6.h>
+#endif
+#include <linux/mroute6.h>
+
+#include <net/raw.h>
+#include <net/rawv6.h>
+#include <net/xfrm.h>
+
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+static struct raw_hashinfo raw_v6_hashinfo = {
+ .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
+};
+
+static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
+ unsigned short num, const struct in6_addr *loc_addr,
+ const struct in6_addr *rmt_addr, int dif)
+{
+ struct hlist_node *node;
+ int is_multicast = ipv6_addr_is_multicast(loc_addr);
+
+ sk_for_each_from(sk, node)
+ if (inet_sk(sk)->inet_num == num) {
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ if (!net_eq(sock_net(sk), net))
+ continue;
+
+ if (!ipv6_addr_any(&np->daddr) &&
+ !ipv6_addr_equal(&np->daddr, rmt_addr))
+ continue;
+
+ if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
+ continue;
+
+ if (!ipv6_addr_any(&np->rcv_saddr)) {
+ if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
+ goto found;
+ if (is_multicast &&
+ inet6_mc_check(sk, loc_addr, rmt_addr))
+ goto found;
+ continue;
+ }
+ goto found;
+ }
+ sk = NULL;
+found:
+ return sk;
+}
+
+/*
+ * 0 - deliver
+ * 1 - block
+ */
+static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
+{
+ struct icmp6hdr *icmph;
+ struct raw6_sock *rp = raw6_sk(sk);
+
+ if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
+ __u32 *data = &rp->filter.data[0];
+ int bit_nr;
+
+ icmph = (struct icmp6hdr *) skb->data;
+ bit_nr = icmph->icmp6_type;
+
+ return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
+ }
+ return 0;
+}
+
+#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
+typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
+
+static mh_filter_t __rcu *mh_filter __read_mostly;
+
+int rawv6_mh_filter_register(mh_filter_t filter)
+{
+ rcu_assign_pointer(mh_filter, filter);
+ return 0;
+}
+EXPORT_SYMBOL(rawv6_mh_filter_register);
+
+int rawv6_mh_filter_unregister(mh_filter_t filter)
+{
+ rcu_assign_pointer(mh_filter, NULL);
+ synchronize_rcu();
+ return 0;
+}
+EXPORT_SYMBOL(rawv6_mh_filter_unregister);
+
+#endif
+
+/*
+ * demultiplex raw sockets.
+ * (should consider queueing the skb in the sock receive_queue
+ * without calling rawv6.c)
+ *
+ * Caller owns SKB so we must make clones.
+ */
+static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
+{
+ const struct in6_addr *saddr;
+ const struct in6_addr *daddr;
+ struct sock *sk;
+ int delivered = 0;
+ __u8 hash;
+ struct net *net;
+
+ saddr = &ipv6_hdr(skb)->saddr;
+ daddr = saddr + 1;
+
+ hash = nexthdr & (MAX_INET_PROTOS - 1);
+
+ read_lock(&raw_v6_hashinfo.lock);
+ sk = sk_head(&raw_v6_hashinfo.ht[hash]);
+
+ if (sk == NULL)
+ goto out;
+
+ net = dev_net(skb->dev);
+ sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
+
+ while (sk) {
+ int filtered;
+
+ delivered = 1;
+ switch (nexthdr) {
+ case IPPROTO_ICMPV6:
+ filtered = icmpv6_filter(sk, skb);
+ break;
+
+#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
+ case IPPROTO_MH:
+ {
+ /* XXX: To validate MH only once for each packet,
+ * this is placed here. It should be after checking
+ * xfrm policy, however it doesn't. The checking xfrm
+ * policy is placed in rawv6_rcv() because it is
+ * required for each socket.
+ */
+ mh_filter_t *filter;
+
+ filter = rcu_dereference(mh_filter);
+ filtered = filter ? (*filter)(sk, skb) : 0;
+ break;
+ }
+#endif
+ default:
+ filtered = 0;
+ break;
+ }
+
+ if (filtered < 0)
+ break;
+ if (filtered == 0) {
+ struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
+
+ /* Not releasing hash table! */
+ if (clone) {
+ nf_reset(clone);
+ rawv6_rcv(sk, clone);
+ }
+ }
+ sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
+ IP6CB(skb)->iif);
+ }
+out:
+ read_unlock(&raw_v6_hashinfo.lock);
+ return delivered;
+}
+
+int raw6_local_deliver(struct sk_buff *skb, int nexthdr)
+{
+ struct sock *raw_sk;
+
+ raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (MAX_INET_PROTOS - 1)]);
+ if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
+ raw_sk = NULL;
+
+ return raw_sk != NULL;
+}
+
+/* This cleans up af_inet6 a bit. -DaveM */
+static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
+ __be32 v4addr = 0;
+ int addr_type;
+ int err;
+
+ if (addr_len < SIN6_LEN_RFC2133)
+ return -EINVAL;
+ addr_type = ipv6_addr_type(&addr->sin6_addr);
+
+ /* Raw sockets are IPv6 only */
+ if (addr_type == IPV6_ADDR_MAPPED)
+ return -EADDRNOTAVAIL;
+
+ lock_sock(sk);
+
+ err = -EINVAL;
+ if (sk->sk_state != TCP_CLOSE)
+ goto out;
+
+ rcu_read_lock();
+ /* Check if the address belongs to the host. */
+ if (addr_type != IPV6_ADDR_ANY) {
+ struct net_device *dev = NULL;
+
+ if (addr_type & IPV6_ADDR_LINKLOCAL) {
+ if (addr_len >= sizeof(struct sockaddr_in6) &&
+ addr->sin6_scope_id) {
+ /* Override any existing binding, if another
+ * one is supplied by user.
+ */
+ sk->sk_bound_dev_if = addr->sin6_scope_id;
+ }
+
+ /* Binding to link-local address requires an interface */
+ if (!sk->sk_bound_dev_if)
+ goto out_unlock;
+
+ err = -ENODEV;
+ dev = dev_get_by_index_rcu(sock_net(sk),
+ sk->sk_bound_dev_if);
+ if (!dev)
+ goto out_unlock;
+ }
+
+ /* ipv4 addr of the socket is invalid. Only the
+ * unspecified and mapped address have a v4 equivalent.
+ */
+ v4addr = LOOPBACK4_IPV6;
+ if (!(addr_type & IPV6_ADDR_MULTICAST)) {
+ err = -EADDRNOTAVAIL;
+ if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
+ dev, 0)) {
+ goto out_unlock;
+ }
+ }
+ }
+
+ inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
+ ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
+ if (!(addr_type & IPV6_ADDR_MULTICAST))
+ ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
+ err = 0;
+out_unlock:
+ rcu_read_unlock();
+out:
+ release_sock(sk);
+ return err;
+}
+
+static void rawv6_err(struct sock *sk, struct sk_buff *skb,
+ struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ int err;
+ int harderr;
+
+ /* Report error on raw socket, if:
+ 1. User requested recverr.
+ 2. Socket is connected (otherwise the error indication
+ is useless without recverr and error is hard.
+ */
+ if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
+ return;
+
+ harderr = icmpv6_err_convert(type, code, &err);
+ if (type == ICMPV6_PKT_TOOBIG)
+ harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
+
+ if (np->recverr) {
+ u8 *payload = skb->data;
+ if (!inet->hdrincl)
+ payload += offset;
+ ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
+ }
+
+ if (np->recverr || harderr) {
+ sk->sk_err = err;
+ sk->sk_error_report(sk);
+ }
+}
+
+void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
+ u8 type, u8 code, int inner_offset, __be32 info)
+{
+ struct sock *sk;
+ int hash;
+ const struct in6_addr *saddr, *daddr;
+ struct net *net;
+
+ hash = nexthdr & (RAW_HTABLE_SIZE - 1);
+
+ read_lock(&raw_v6_hashinfo.lock);
+ sk = sk_head(&raw_v6_hashinfo.ht[hash]);
+ if (sk != NULL) {
+ /* Note: ipv6_hdr(skb) != skb->data */
+ const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
+ saddr = &ip6h->saddr;
+ daddr = &ip6h->daddr;
+ net = dev_net(skb->dev);
+
+ while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
+ IP6CB(skb)->iif))) {
+ rawv6_err(sk, skb, NULL, type, code,
+ inner_offset, info);
+ sk = sk_next(sk);
+ }
+ }
+ read_unlock(&raw_v6_hashinfo.lock);
+}
+
+static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
+{
+ if ((raw6_sk(sk)->checksum || rcu_dereference_raw(sk->sk_filter)) &&
+ skb_checksum_complete(skb)) {
+ atomic_inc(&sk->sk_drops);
+ kfree_skb(skb);
+ return NET_RX_DROP;
+ }
+
+ /* Charge it to the socket. */
+ if (ip_queue_rcv_skb(sk, skb) < 0) {
+ kfree_skb(skb);
+ return NET_RX_DROP;
+ }
+
+ return 0;
+}
+
+/*
+ * This is next to useless...
+ * if we demultiplex in network layer we don't need the extra call
+ * just to queue the skb...
+ * maybe we could have the network decide upon a hint if it
+ * should call raw_rcv for demultiplexing
+ */
+int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct raw6_sock *rp = raw6_sk(sk);
+
+ if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
+ atomic_inc(&sk->sk_drops);
+ kfree_skb(skb);
+ return NET_RX_DROP;
+ }
+
+ if (!rp->checksum)
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ if (skb->ip_summed == CHECKSUM_COMPLETE) {
+ skb_postpull_rcsum(skb, skb_network_header(skb),
+ skb_network_header_len(skb));
+ if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr,
+ skb->len, inet->inet_num, skb->csum))
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ if (!skb_csum_unnecessary(skb))
+ skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr,
+ skb->len,
+ inet->inet_num, 0));
+
+ if (inet->hdrincl) {
+ if (skb_checksum_complete(skb)) {
+ atomic_inc(&sk->sk_drops);
+ kfree_skb(skb);
+ return NET_RX_DROP;
+ }
+ }
+
+ rawv6_rcv_skb(sk, skb);
+ return 0;
+}
+
+
+/*
+ * This should be easy, if there is something there
+ * we return it, otherwise we block.
+ */
+
+static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
+ struct msghdr *msg, size_t len,
+ int noblock, int flags, int *addr_len)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
+ struct sk_buff *skb;
+ size_t copied;
+ int err;
+
+ if (flags & MSG_OOB)
+ return -EOPNOTSUPP;
+
+ if (addr_len)
+ *addr_len=sizeof(*sin6);
+
+ if (flags & MSG_ERRQUEUE)
+ return ipv6_recv_error(sk, msg, len);
+
+ if (np->rxpmtu && np->rxopt.bits.rxpmtu)
+ return ipv6_recv_rxpmtu(sk, msg, len);
+
+ skb = skb_recv_datagram(sk, flags, noblock, &err);
+ if (!skb)
+ goto out;
+
+ copied = skb->len;
+ if (copied > len) {
+ copied = len;
+ msg->msg_flags |= MSG_TRUNC;
+ }
+
+ if (skb_csum_unnecessary(skb)) {
+ err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+ } else if (msg->msg_flags&MSG_TRUNC) {
+ if (__skb_checksum_complete(skb))
+ goto csum_copy_err;
+ err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+ } else {
+ err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
+ if (err == -EINVAL)
+ goto csum_copy_err;
+ }
+ if (err)
+ goto out_free;
+
+ /* Copy the address. */
+ if (sin6) {
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = 0;
+ ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
+ sin6->sin6_flowinfo = 0;
+ sin6->sin6_scope_id = 0;
+ if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
+ sin6->sin6_scope_id = IP6CB(skb)->iif;
+ }
+
+ sock_recv_ts_and_drops(msg, sk, skb);
+
+ if (np->rxopt.all)
+ datagram_recv_ctl(sk, msg, skb);
+
+ err = copied;
+ if (flags & MSG_TRUNC)
+ err = skb->len;
+
+out_free:
+ skb_free_datagram(sk, skb);
+out:
+ return err;
+
+csum_copy_err:
+ skb_kill_datagram(sk, skb, flags);
+
+ /* Error for blocking case is chosen to masquerade
+ as some normal condition.
+ */
+ err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
+ goto out;
+}
+
+static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
+ struct raw6_sock *rp)
+{
+ struct sk_buff *skb;
+ int err = 0;
+ int offset;
+ int len;
+ int total_len;
+ __wsum tmp_csum;
+ __sum16 csum;
+
+ if (!rp->checksum)
+ goto send;
+
+ if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
+ goto out;
+
+ offset = rp->offset;
+ total_len = inet_sk(sk)->cork.base.length - (skb_network_header(skb) -
+ skb->data);
+ if (offset >= total_len - 1) {
+ err = -EINVAL;
+ ip6_flush_pending_frames(sk);
+ goto out;
+ }
+
+ /* should be check HW csum miyazawa */
+ if (skb_queue_len(&sk->sk_write_queue) == 1) {
+ /*
+ * Only one fragment on the socket.
+ */
+ tmp_csum = skb->csum;
+ } else {
+ struct sk_buff *csum_skb = NULL;
+ tmp_csum = 0;
+
+ skb_queue_walk(&sk->sk_write_queue, skb) {
+ tmp_csum = csum_add(tmp_csum, skb->csum);
+
+ if (csum_skb)
+ continue;
+
+ len = skb->len - skb_transport_offset(skb);
+ if (offset >= len) {
+ offset -= len;
+ continue;
+ }
+
+ csum_skb = skb;
+ }
+
+ skb = csum_skb;
+ }
+
+ offset += skb_transport_offset(skb);
+ if (skb_copy_bits(skb, offset, &csum, 2))
+ BUG();
+
+ /* in case cksum was not initialized */
+ if (unlikely(csum))
+ tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
+
+ csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
+ total_len, fl6->flowi6_proto, tmp_csum);
+
+ if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
+ csum = CSUM_MANGLED_0;
+
+ if (skb_store_bits(skb, offset, &csum, 2))
+ BUG();
+
+send:
+ err = ip6_push_pending_frames(sk);
+out:
+ return err;
+}
+
+static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
+ struct flowi6 *fl6, struct dst_entry **dstp,
+ unsigned int flags)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct ipv6hdr *iph;
+ struct sk_buff *skb;
+ int err;
+ struct rt6_info *rt = (struct rt6_info *)*dstp;
+
+ if (length > rt->dst.dev->mtu) {
+ ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
+ return -EMSGSIZE;
+ }
+ if (flags&MSG_PROBE)
+ goto out;
+
+ skb = sock_alloc_send_skb(sk,
+ length + LL_ALLOCATED_SPACE(rt->dst.dev) + 15,
+ flags & MSG_DONTWAIT, &err);
+ if (skb == NULL)
+ goto error;
+ skb_reserve(skb, LL_RESERVED_SPACE(rt->dst.dev));
+
+ skb->priority = sk->sk_priority;
+ skb->mark = sk->sk_mark;
+ skb_dst_set(skb, &rt->dst);
+ *dstp = NULL;
+
+ skb_put(skb, length);
+ skb_reset_network_header(skb);
+ iph = ipv6_hdr(skb);
+
+ skb->ip_summed = CHECKSUM_NONE;
+
+ skb->transport_header = skb->network_header;
+ err = memcpy_fromiovecend((void *)iph, from, 0, length);
+ if (err)
+ goto error_fault;
+
+ IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
+ err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
+ rt->dst.dev, dst_output);
+ if (err > 0)
+ err = net_xmit_errno(err);
+ if (err)
+ goto error;
+out:
+ return 0;
+
+error_fault:
+ err = -EFAULT;
+ kfree_skb(skb);
+error:
+ IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
+ if (err == -ENOBUFS && !np->recverr)
+ err = 0;
+ return err;
+}
+
+static int rawv6_probe_proto_opt(struct flowi6 *fl6, struct msghdr *msg)
+{
+ struct iovec *iov;
+ u8 __user *type = NULL;
+ u8 __user *code = NULL;
+ u8 len = 0;
+ int probed = 0;
+ int i;
+
+ if (!msg->msg_iov)
+ return 0;
+
+ for (i = 0; i < msg->msg_iovlen; i++) {
+ iov = &msg->msg_iov[i];
+ if (!iov)
+ continue;
+
+ switch (fl6->flowi6_proto) {
+ case IPPROTO_ICMPV6:
+ /* check if one-byte field is readable or not. */
+ if (iov->iov_base && iov->iov_len < 1)
+ break;
+
+ if (!type) {
+ type = iov->iov_base;
+ /* check if code field is readable or not. */
+ if (iov->iov_len > 1)
+ code = type + 1;
+ } else if (!code)
+ code = iov->iov_base;
+
+ if (type && code) {
+ if (get_user(fl6->fl6_icmp_type, type) ||
+ get_user(fl6->fl6_icmp_code, code))
+ return -EFAULT;
+ probed = 1;
+ }
+ break;
+ case IPPROTO_MH:
+ if (iov->iov_base && iov->iov_len < 1)
+ break;
+ /* check if type field is readable or not. */
+ if (iov->iov_len > 2 - len) {
+ u8 __user *p = iov->iov_base;
+ if (get_user(fl6->fl6_mh_type, &p[2 - len]))
+ return -EFAULT;
+ probed = 1;
+ } else
+ len += iov->iov_len;
+
+ break;
+ default:
+ probed = 1;
+ break;
+ }
+ if (probed)
+ break;
+ }
+ return 0;
+}
+
+static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
+ struct msghdr *msg, size_t len)
+{
+ struct ipv6_txoptions opt_space;
+ struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
+ struct in6_addr *daddr, *final_p, final;
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct raw6_sock *rp = raw6_sk(sk);
+ struct ipv6_txoptions *opt = NULL;
+ struct ip6_flowlabel *flowlabel = NULL;
+ struct dst_entry *dst = NULL;
+ struct flowi6 fl6;
+ int addr_len = msg->msg_namelen;
+ int hlimit = -1;
+ int tclass = -1;
+ int dontfrag = -1;
+ u16 proto;
+ int err;
+
+ /* Rough check on arithmetic overflow,
+ better check is made in ip6_append_data().
+ */
+ if (len > INT_MAX)
+ return -EMSGSIZE;
+
+ /* Mirror BSD error message compatibility */
+ if (msg->msg_flags & MSG_OOB)
+ return -EOPNOTSUPP;
+
+ /*
+ * Get and verify the address.
+ */
+ memset(&fl6, 0, sizeof(fl6));
+
+ fl6.flowi6_mark = sk->sk_mark;
+
+ if (sin6) {
+ if (addr_len < SIN6_LEN_RFC2133)
+ return -EINVAL;
+
+ if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
+ return -EAFNOSUPPORT;
+
+ /* port is the proto value [0..255] carried in nexthdr */
+ proto = ntohs(sin6->sin6_port);
+
+ if (!proto)
+ proto = inet->inet_num;
+ else if (proto != inet->inet_num)
+ return -EINVAL;
+
+ if (proto > 255)
+ return -EINVAL;
+
+ daddr = &sin6->sin6_addr;
+ if (np->sndflow) {
+ fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
+ if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
+ flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
+ if (flowlabel == NULL)
+ return -EINVAL;
+ daddr = &flowlabel->dst;
+ }
+ }
+
+ /*
+ * Otherwise it will be difficult to maintain
+ * sk->sk_dst_cache.
+ */
+ if (sk->sk_state == TCP_ESTABLISHED &&
+ ipv6_addr_equal(daddr, &np->daddr))
+ daddr = &np->daddr;
+
+ if (addr_len >= sizeof(struct sockaddr_in6) &&
+ sin6->sin6_scope_id &&
+ ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
+ fl6.flowi6_oif = sin6->sin6_scope_id;
+ } else {
+ if (sk->sk_state != TCP_ESTABLISHED)
+ return -EDESTADDRREQ;
+
+ proto = inet->inet_num;
+ daddr = &np->daddr;
+ fl6.flowlabel = np->flow_label;
+ }
+
+ if (fl6.flowi6_oif == 0)
+ fl6.flowi6_oif = sk->sk_bound_dev_if;
+
+ if (msg->msg_controllen) {
+ opt = &opt_space;
+ memset(opt, 0, sizeof(struct ipv6_txoptions));
+ opt->tot_len = sizeof(struct ipv6_txoptions);
+
+ err = datagram_send_ctl(sock_net(sk), msg, &fl6, opt, &hlimit,
+ &tclass, &dontfrag);
+ if (err < 0) {
+ fl6_sock_release(flowlabel);
+ return err;
+ }
+ if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
+ flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
+ if (flowlabel == NULL)
+ return -EINVAL;
+ }
+ if (!(opt->opt_nflen|opt->opt_flen))
+ opt = NULL;
+ }
+ if (opt == NULL)
+ opt = np->opt;
+ if (flowlabel)
+ opt = fl6_merge_options(&opt_space, flowlabel, opt);
+ opt = ipv6_fixup_options(&opt_space, opt);
+
+ fl6.flowi6_proto = proto;
+ err = rawv6_probe_proto_opt(&fl6, msg);
+ if (err)
+ goto out;
+
+ if (!ipv6_addr_any(daddr))
+ ipv6_addr_copy(&fl6.daddr, daddr);
+ else
+ fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
+ if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
+ ipv6_addr_copy(&fl6.saddr, &np->saddr);
+
+ final_p = fl6_update_dst(&fl6, opt, &final);
+
+ if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
+ fl6.flowi6_oif = np->mcast_oif;
+ security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
+
+ dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
+ if (IS_ERR(dst)) {
+ err = PTR_ERR(dst);
+ goto out;
+ }
+ if (hlimit < 0) {
+ if (ipv6_addr_is_multicast(&fl6.daddr))
+ hlimit = np->mcast_hops;
+ else
+ hlimit = np->hop_limit;
+ if (hlimit < 0)
+ hlimit = ip6_dst_hoplimit(dst);
+ }
+
+ if (tclass < 0)
+ tclass = np->tclass;
+
+ if (dontfrag < 0)
+ dontfrag = np->dontfrag;
+
+ if (msg->msg_flags&MSG_CONFIRM)
+ goto do_confirm;
+
+back_from_confirm:
+ if (inet->hdrincl)
+ err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl6, &dst, msg->msg_flags);
+ else {
+ lock_sock(sk);
+ err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
+ len, 0, hlimit, tclass, opt, &fl6, (struct rt6_info*)dst,
+ msg->msg_flags, dontfrag);
+
+ if (err)
+ ip6_flush_pending_frames(sk);
+ else if (!(msg->msg_flags & MSG_MORE))
+ err = rawv6_push_pending_frames(sk, &fl6, rp);
+ release_sock(sk);
+ }
+done:
+ dst_release(dst);
+out:
+ fl6_sock_release(flowlabel);
+ return err<0?err:len;
+do_confirm:
+ dst_confirm(dst);
+ if (!(msg->msg_flags & MSG_PROBE) || len)
+ goto back_from_confirm;
+ err = 0;
+ goto done;
+}
+
+static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
+ char __user *optval, int optlen)
+{
+ switch (optname) {
+ case ICMPV6_FILTER:
+ if (optlen > sizeof(struct icmp6_filter))
+ optlen = sizeof(struct icmp6_filter);
+ if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
+ return -EFAULT;
+ return 0;
+ default:
+ return -ENOPROTOOPT;
+ }
+
+ return 0;
+}
+
+static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ int len;
+
+ switch (optname) {
+ case ICMPV6_FILTER:
+ if (get_user(len, optlen))
+ return -EFAULT;
+ if (len < 0)
+ return -EINVAL;
+ if (len > sizeof(struct icmp6_filter))
+ len = sizeof(struct icmp6_filter);
+ if (put_user(len, optlen))
+ return -EFAULT;
+ if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
+ return -EFAULT;
+ return 0;
+ default:
+ return -ENOPROTOOPT;
+ }
+
+ return 0;
+}
+
+
+static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ struct raw6_sock *rp = raw6_sk(sk);
+ int val;
+
+ if (get_user(val, (int __user *)optval))
+ return -EFAULT;
+
+ switch (optname) {
+ case IPV6_CHECKSUM:
+ if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
+ level == IPPROTO_IPV6) {
+ /*
+ * RFC3542 tells that IPV6_CHECKSUM socket
+ * option in the IPPROTO_IPV6 level is not
+ * allowed on ICMPv6 sockets.
+ * If you want to set it, use IPPROTO_RAW
+ * level IPV6_CHECKSUM socket option
+ * (Linux extension).
+ */
+ return -EINVAL;
+ }
+
+ /* You may get strange result with a positive odd offset;
+ RFC2292bis agrees with me. */
+ if (val > 0 && (val&1))
+ return -EINVAL;
+ if (val < 0) {
+ rp->checksum = 0;
+ } else {
+ rp->checksum = 1;
+ rp->offset = val;
+ }
+
+ return 0;
+ break;
+
+ default:
+ return -ENOPROTOOPT;
+ }
+}
+
+static int rawv6_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ switch(level) {
+ case SOL_RAW:
+ break;
+
+ case SOL_ICMPV6:
+ if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return -EOPNOTSUPP;
+ return rawv6_seticmpfilter(sk, level, optname, optval,
+ optlen);
+ case SOL_IPV6:
+ if (optname == IPV6_CHECKSUM)
+ break;
+ default:
+ return ipv6_setsockopt(sk, level, optname, optval,
+ optlen);
+ }
+
+ return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
+}
+
+#ifdef CONFIG_COMPAT
+static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ switch (level) {
+ case SOL_RAW:
+ break;
+ case SOL_ICMPV6:
+ if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return -EOPNOTSUPP;
+ return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
+ case SOL_IPV6:
+ if (optname == IPV6_CHECKSUM)
+ break;
+ default:
+ return compat_ipv6_setsockopt(sk, level, optname,
+ optval, optlen);
+ }
+ return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
+}
+#endif
+
+static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ struct raw6_sock *rp = raw6_sk(sk);
+ int val, len;
+
+ if (get_user(len,optlen))
+ return -EFAULT;
+
+ switch (optname) {
+ case IPV6_CHECKSUM:
+ /*
+ * We allow getsockopt() for IPPROTO_IPV6-level
+ * IPV6_CHECKSUM socket option on ICMPv6 sockets
+ * since RFC3542 is silent about it.
+ */
+ if (rp->checksum == 0)
+ val = -1;
+ else
+ val = rp->offset;
+ break;
+
+ default:
+ return -ENOPROTOOPT;
+ }
+
+ len = min_t(unsigned int, sizeof(int), len);
+
+ if (put_user(len, optlen))
+ return -EFAULT;
+ if (copy_to_user(optval,&val,len))
+ return -EFAULT;
+ return 0;
+}
+
+static int rawv6_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ switch(level) {
+ case SOL_RAW:
+ break;
+
+ case SOL_ICMPV6:
+ if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return -EOPNOTSUPP;
+ return rawv6_geticmpfilter(sk, level, optname, optval,
+ optlen);
+ case SOL_IPV6:
+ if (optname == IPV6_CHECKSUM)
+ break;
+ default:
+ return ipv6_getsockopt(sk, level, optname, optval,
+ optlen);
+ }
+
+ return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
+}
+
+#ifdef CONFIG_COMPAT
+static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ switch (level) {
+ case SOL_RAW:
+ break;
+ case SOL_ICMPV6:
+ if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return -EOPNOTSUPP;
+ return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
+ case SOL_IPV6:
+ if (optname == IPV6_CHECKSUM)
+ break;
+ default:
+ return compat_ipv6_getsockopt(sk, level, optname,
+ optval, optlen);
+ }
+ return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
+}
+#endif
+
+static int rawv6_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 != NULL)
+ amount = skb->tail - skb->transport_header;
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+ return put_user(amount, (int __user *)arg);
+ }
+
+ default:
+#ifdef CONFIG_IPV6_MROUTE
+ return ip6mr_ioctl(sk, cmd, (void __user *)arg);
+#else
+ return -ENOIOCTLCMD;
+#endif
+ }
+}
+
+#ifdef CONFIG_COMPAT
+static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case SIOCOUTQ:
+ case SIOCINQ:
+ return -ENOIOCTLCMD;
+ default:
+#ifdef CONFIG_IPV6_MROUTE
+ return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
+#else
+ return -ENOIOCTLCMD;
+#endif
+ }
+}
+#endif
+
+static void rawv6_close(struct sock *sk, long timeout)
+{
+ if (inet_sk(sk)->inet_num == IPPROTO_RAW)
+ ip6_ra_control(sk, -1);
+ ip6mr_sk_done(sk);
+ sk_common_release(sk);
+}
+
+static void raw6_destroy(struct sock *sk)
+{
+ lock_sock(sk);
+ ip6_flush_pending_frames(sk);
+ release_sock(sk);
+
+ inet6_destroy_sock(sk);
+}
+
+static int rawv6_init_sk(struct sock *sk)
+{
+ struct raw6_sock *rp = raw6_sk(sk);
+
+ switch (inet_sk(sk)->inet_num) {
+ case IPPROTO_ICMPV6:
+ rp->checksum = 1;
+ rp->offset = 2;
+ break;
+ case IPPROTO_MH:
+ rp->checksum = 1;
+ rp->offset = 4;
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+struct proto rawv6_prot = {
+ .name = "RAWv6",
+ .owner = THIS_MODULE,
+ .close = rawv6_close,
+ .destroy = raw6_destroy,
+ .connect = ip6_datagram_connect,
+ .disconnect = udp_disconnect,
+ .ioctl = rawv6_ioctl,
+ .init = rawv6_init_sk,
+ .setsockopt = rawv6_setsockopt,
+ .getsockopt = rawv6_getsockopt,
+ .sendmsg = rawv6_sendmsg,
+ .recvmsg = rawv6_recvmsg,
+ .bind = rawv6_bind,
+ .backlog_rcv = rawv6_rcv_skb,
+ .hash = raw_hash_sk,
+ .unhash = raw_unhash_sk,
+ .obj_size = sizeof(struct raw6_sock),
+ .h.raw_hash = &raw_v6_hashinfo,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_rawv6_setsockopt,
+ .compat_getsockopt = compat_rawv6_getsockopt,
+ .compat_ioctl = compat_rawv6_ioctl,
+#endif
+};
+
+#ifdef CONFIG_PROC_FS
+static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
+{
+ struct ipv6_pinfo *np = inet6_sk(sp);
+ const struct in6_addr *dest, *src;
+ __u16 destp, srcp;
+
+ dest = &np->daddr;
+ src = &np->rcv_saddr;
+ destp = 0;
+ srcp = inet_sk(sp)->inet_num;
+ seq_printf(seq,
+ "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
+ "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
+ i,
+ src->s6_addr32[0], src->s6_addr32[1],
+ src->s6_addr32[2], src->s6_addr32[3], srcp,
+ dest->s6_addr32[0], dest->s6_addr32[1],
+ dest->s6_addr32[2], dest->s6_addr32[3], 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));
+}
+
+static int raw6_seq_show(struct seq_file *seq, void *v)
+{
+ if (v == SEQ_START_TOKEN)
+ seq_printf(seq,
+ " sl "
+ "local_address "
+ "remote_address "
+ "st tx_queue rx_queue tr tm->when retrnsmt"
+ " uid timeout inode ref pointer drops\n");
+ else
+ raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
+ return 0;
+}
+
+static const struct seq_operations raw6_seq_ops = {
+ .start = raw_seq_start,
+ .next = raw_seq_next,
+ .stop = raw_seq_stop,
+ .show = raw6_seq_show,
+};
+
+static int raw6_seq_open(struct inode *inode, struct file *file)
+{
+ return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
+}
+
+static const struct file_operations raw6_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = raw6_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_net,
+};
+
+static int __net_init raw6_init_net(struct net *net)
+{
+ if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void __net_exit raw6_exit_net(struct net *net)
+{
+ proc_net_remove(net, "raw6");
+}
+
+static struct pernet_operations raw6_net_ops = {
+ .init = raw6_init_net,
+ .exit = raw6_exit_net,
+};
+
+int __init raw6_proc_init(void)
+{
+ return register_pernet_subsys(&raw6_net_ops);
+}
+
+void raw6_proc_exit(void)
+{
+ unregister_pernet_subsys(&raw6_net_ops);
+}
+#endif /* CONFIG_PROC_FS */
+
+/* Same as inet6_dgram_ops, sans udp_poll. */
+static const struct proto_ops inet6_sockraw_ops = {
+ .family = PF_INET6,
+ .owner = THIS_MODULE,
+ .release = inet6_release,
+ .bind = inet6_bind,
+ .connect = inet_dgram_connect, /* ok */
+ .socketpair = sock_no_socketpair, /* a do nothing */
+ .accept = sock_no_accept, /* a do nothing */
+ .getname = inet6_getname,
+ .poll = datagram_poll, /* ok */
+ .ioctl = inet6_ioctl, /* must change */
+ .listen = sock_no_listen, /* ok */
+ .shutdown = inet_shutdown, /* ok */
+ .setsockopt = sock_common_setsockopt, /* ok */
+ .getsockopt = sock_common_getsockopt, /* ok */
+ .sendmsg = inet_sendmsg, /* ok */
+ .recvmsg = sock_common_recvmsg, /* ok */
+ .mmap = sock_no_mmap,
+ .sendpage = sock_no_sendpage,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_sock_common_setsockopt,
+ .compat_getsockopt = compat_sock_common_getsockopt,
+#endif
+};
+
+static struct inet_protosw rawv6_protosw = {
+ .type = SOCK_RAW,
+ .protocol = IPPROTO_IP, /* wild card */
+ .prot = &rawv6_prot,
+ .ops = &inet6_sockraw_ops,
+ .no_check = UDP_CSUM_DEFAULT,
+ .flags = INET_PROTOSW_REUSE,
+};
+
+int __init rawv6_init(void)
+{
+ int ret;
+
+ ret = inet6_register_protosw(&rawv6_protosw);
+ if (ret)
+ goto out;
+out:
+ return ret;
+}
+
+void rawv6_exit(void)
+{
+ inet6_unregister_protosw(&rawv6_protosw);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-13 12:06:55 +0000