| /* |
| * RAW sockets for IPv6 |
| * Linux INET6 implementation |
| * |
| * Authors: |
| * Pedro Roque <roque@di.fc.ul.pt> |
| * |
| * Adapted from linux/net/ipv4/raw.c |
| * |
| * $Id: raw.c,v 1.51 2002/02/01 22:01:04 davem Exp $ |
| * |
| * 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/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 <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, struct in6_addr *loc_addr, |
| 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)->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) |
| static int (*mh_filter)(struct sock *sock, struct sk_buff *skb); |
| |
| int rawv6_mh_filter_register(int (*filter)(struct sock *sock, |
| struct sk_buff *skb)) |
| { |
| rcu_assign_pointer(mh_filter, filter); |
| return 0; |
| } |
| EXPORT_SYMBOL(rawv6_mh_filter_register); |
| |
| int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock, |
| struct sk_buff *skb)) |
| { |
| 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) |
| { |
| struct in6_addr *saddr; |
| 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. |
| */ |
| int (*filter)(struct sock *sock, struct sk_buff *skb); |
| |
| 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; |
| |
| /* 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; |
| |
| dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if); |
| if (!dev) { |
| err = -ENODEV; |
| goto out; |
| } |
| } |
| |
| /* 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)) { |
| if (dev) |
| dev_put(dev); |
| goto out; |
| } |
| } |
| if (dev) |
| dev_put(dev); |
| } |
| |
| inet->rcv_saddr = 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: |
| release_sock(sk); |
| return err; |
| } |
| |
| static void rawv6_err(struct sock *sk, struct sk_buff *skb, |
| struct inet6_skb_parm *opt, |
| int type, int 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, |
| int type, int code, int inner_offset, __be32 info) |
| { |
| struct sock *sk; |
| int hash; |
| 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 */ |
| struct ipv6hdr *ip6h = (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 || sk->sk_filter) && |
| skb_checksum_complete(skb)) { |
| atomic_inc(&sk->sk_drops); |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| /* Charge it to the socket. */ |
| if (sock_queue_rcv_skb(sk,skb)<0) { |
| atomic_inc(&sk->sk_drops); |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| 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->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->num, 0)); |
| |
| if (inet->hdrincl) { |
| if (skb_checksum_complete(skb)) { |
| atomic_inc(&sk->sk_drops); |
| kfree_skb(skb); |
| return 0; |
| } |
| } |
| |
| 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); |
| |
| 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_timestamp(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; |
| atomic_inc(&sk->sk_drops); |
| goto out; |
| } |
| |
| static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl, |
| 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.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(&fl->fl6_src, |
| &fl->fl6_dst, |
| total_len, fl->proto, tmp_csum); |
| |
| if (csum == 0 && fl->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 flowi *fl, struct rt6_info *rt, |
| unsigned int flags) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct ipv6hdr *iph; |
| struct sk_buff *skb; |
| int err; |
| |
| if (length > rt->u.dst.dev->mtu) { |
| ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu); |
| return -EMSGSIZE; |
| } |
| if (flags&MSG_PROBE) |
| goto out; |
| |
| skb = sock_alloc_send_skb(sk, |
| length + LL_ALLOCATED_SPACE(rt->u.dst.dev) + 15, |
| flags & MSG_DONTWAIT, &err); |
| if (skb == NULL) |
| goto error; |
| skb_reserve(skb, LL_RESERVED_SPACE(rt->u.dst.dev)); |
| |
| skb->priority = sk->sk_priority; |
| skb->mark = sk->sk_mark; |
| skb->dst = dst_clone(&rt->u.dst); |
| |
| 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_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS); |
| err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev, |
| dst_output); |
| if (err > 0) |
| err = np->recverr ? net_xmit_errno(err) : 0; |
| if (err) |
| goto error; |
| out: |
| return 0; |
| |
| error_fault: |
| err = -EFAULT; |
| kfree_skb(skb); |
| error: |
| IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
| return err; |
| } |
| |
| static int rawv6_probe_proto_opt(struct flowi *fl, 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 (fl->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(fl->fl_icmp_type, type) || |
| get_user(fl->fl_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(fl->fl_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 = NULL, 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 flowi fl; |
| int addr_len = msg->msg_namelen; |
| int hlimit = -1; |
| int tclass = -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(&fl, 0, sizeof(fl)); |
| |
| fl.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->num; |
| else if (proto != inet->num) |
| return(-EINVAL); |
| |
| if (proto > 255) |
| return(-EINVAL); |
| |
| daddr = &sin6->sin6_addr; |
| if (np->sndflow) { |
| fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { |
| flowlabel = fl6_sock_lookup(sk, fl.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) |
| fl.oif = sin6->sin6_scope_id; |
| } else { |
| if (sk->sk_state != TCP_ESTABLISHED) |
| return -EDESTADDRREQ; |
| |
| proto = inet->num; |
| daddr = &np->daddr; |
| fl.fl6_flowlabel = np->flow_label; |
| } |
| |
| if (fl.oif == 0) |
| fl.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(msg, &fl, opt, &hlimit, &tclass); |
| if (err < 0) { |
| fl6_sock_release(flowlabel); |
| return err; |
| } |
| if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
| flowlabel = fl6_sock_lookup(sk, fl.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); |
| |
| fl.proto = proto; |
| err = rawv6_probe_proto_opt(&fl, msg); |
| if (err) |
| goto out; |
| |
| if (!ipv6_addr_any(daddr)) |
| ipv6_addr_copy(&fl.fl6_dst, daddr); |
| else |
| fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
| if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) |
| ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
| |
| /* merge ip6_build_xmit from ip6_output */ |
| if (opt && opt->srcrt) { |
| struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; |
| ipv6_addr_copy(&final, &fl.fl6_dst); |
| ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| final_p = &final; |
| } |
| |
| if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) |
| fl.oif = np->mcast_oif; |
| security_sk_classify_flow(sk, &fl); |
| |
| err = ip6_dst_lookup(sk, &dst, &fl); |
| if (err) |
| goto out; |
| if (final_p) |
| ipv6_addr_copy(&fl.fl6_dst, final_p); |
| |
| if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) { |
| if (err == -EREMOTE) |
| err = ip6_dst_blackhole(sk, &dst, &fl); |
| if (err < 0) |
| goto out; |
| } |
| |
| if (hlimit < 0) { |
| if (ipv6_addr_is_multicast(&fl.fl6_dst)) |
| hlimit = np->mcast_hops; |
| else |
| hlimit = np->hop_limit; |
| if (hlimit < 0) |
| hlimit = ip6_dst_hoplimit(dst); |
| } |
| |
| if (tclass < 0) { |
| tclass = np->tclass; |
| if (tclass < 0) |
| tclass = 0; |
| } |
| |
| if (msg->msg_flags&MSG_CONFIRM) |
| goto do_confirm; |
| |
| back_from_confirm: |
| if (inet->hdrincl) { |
| err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags); |
| } else { |
| lock_sock(sk); |
| err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, |
| len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst, |
| msg->msg_flags); |
| |
| if (err) |
| ip6_flush_pending_frames(sk); |
| else if (!(msg->msg_flags & MSG_MORE)) |
| err = rawv6_push_pending_frames(sk, &fl, 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, 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)->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, int optlen) |
| { |
| switch(level) { |
| case SOL_RAW: |
| break; |
| |
| case SOL_ICMPV6: |
| if (inet_sk(sk)->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, int optlen) |
| { |
| switch (level) { |
| case SOL_RAW: |
| break; |
| case SOL_ICMPV6: |
| if (inet_sk(sk)->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)->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)->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 = atomic_read(&sk->sk_wmem_alloc); |
| 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 |
| } |
| } |
| |
| static void rawv6_close(struct sock *sk, long timeout) |
| { |
| if (inet_sk(sk)->num == IPPROTO_RAW) |
| ip6_ra_control(sk, -1, NULL); |
| ip6mr_sk_done(sk); |
| sk_common_release(sk); |
| } |
| |
| static int rawv6_init_sk(struct sock *sk) |
| { |
| struct raw6_sock *rp = raw6_sk(sk); |
| |
| switch (inet_sk(sk)->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, |
| .connect = ip6_datagram_connect, |
| .disconnect = udp_disconnect, |
| .ioctl = rawv6_ioctl, |
| .init = rawv6_init_sk, |
| .destroy = inet6_destroy_sock, |
| .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, |
| #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); |
| struct in6_addr *dest, *src; |
| __u16 destp, srcp; |
| |
| dest = &np->daddr; |
| src = &np->rcv_saddr; |
| destp = 0; |
| srcp = inet_sk(sp)->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 %p %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, |
| atomic_read(&sp->sk_wmem_alloc), |
| atomic_read(&sp->sk_rmem_alloc), |
| 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 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 raw6_init_net(struct net *net) |
| { |
| if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops)) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void 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, |
| .capability = CAP_NET_RAW, |
| .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); |
| } |