| /* |
| * 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 <linux/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 IS_ENABLED(CONFIG_IPV6_MIP6) |
| #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> |
| #include <linux/export.h> |
| |
| #define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */ |
| |
| struct raw_hashinfo raw_v6_hashinfo = { |
| .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock), |
| }; |
| EXPORT_SYMBOL_GPL(raw_v6_hashinfo); |
| |
| 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, int sdif) |
| { |
| bool is_multicast = ipv6_addr_is_multicast(loc_addr); |
| |
| sk_for_each_from(sk) |
| if (inet_sk(sk)->inet_num == num) { |
| |
| if (!net_eq(sock_net(sk), net)) |
| continue; |
| |
| if (!ipv6_addr_any(&sk->sk_v6_daddr) && |
| !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) |
| continue; |
| |
| if (!raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, |
| dif, sdif)) |
| continue; |
| |
| if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
| if (ipv6_addr_equal(&sk->sk_v6_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; |
| } |
| EXPORT_SYMBOL_GPL(__raw_v6_lookup); |
| |
| /* |
| * 0 - deliver |
| * 1 - block |
| */ |
| static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb) |
| { |
| struct icmp6hdr _hdr; |
| const struct icmp6hdr *hdr; |
| |
| /* We require only the four bytes of the ICMPv6 header, not any |
| * additional bytes of message body in "struct icmp6hdr". |
| */ |
| hdr = skb_header_pointer(skb, skb_transport_offset(skb), |
| ICMPV6_HDRLEN, &_hdr); |
| if (hdr) { |
| const __u32 *data = &raw6_sk(sk)->filter.data[0]; |
| unsigned int type = hdr->icmp6_type; |
| |
| return (data[type >> 5] & (1U << (type & 31))) != 0; |
| } |
| return 1; |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6_MIP6) |
| 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_INIT_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 bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) |
| { |
| const struct in6_addr *saddr; |
| const struct in6_addr *daddr; |
| struct sock *sk; |
| bool delivered = false; |
| __u8 hash; |
| struct net *net; |
| |
| saddr = &ipv6_hdr(skb)->saddr; |
| daddr = saddr + 1; |
| |
| hash = nexthdr & (RAW_HTABLE_SIZE - 1); |
| |
| read_lock(&raw_v6_hashinfo.lock); |
| sk = sk_head(&raw_v6_hashinfo.ht[hash]); |
| |
| if (!sk) |
| goto out; |
| |
| net = dev_net(skb->dev); |
| sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, |
| inet6_iif(skb), inet6_sdif(skb)); |
| |
| while (sk) { |
| int filtered; |
| |
| delivered = true; |
| switch (nexthdr) { |
| case IPPROTO_ICMPV6: |
| filtered = icmpv6_filter(sk, skb); |
| break; |
| |
| #if IS_ENABLED(CONFIG_IPV6_MIP6) |
| 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, |
| inet6_iif(skb), inet6_sdif(skb)); |
| } |
| out: |
| read_unlock(&raw_v6_hashinfo.lock); |
| return delivered; |
| } |
| |
| bool raw6_local_deliver(struct sk_buff *skb, int nexthdr) |
| { |
| struct sock *raw_sk; |
| |
| raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 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; |
| |
| if (addr->sin6_family != AF_INET6) |
| 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 (__ipv6_addr_needs_scope_id(addr_type)) { |
| 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) && |
| !sock_net(sk)->ipv6.sysctl.ip_nonlocal_bind) { |
| 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; |
| sk->sk_v6_rcv_saddr = addr->sin6_addr; |
| if (!(addr_type & IPV6_ADDR_MULTICAST)) |
| 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) { |
| ip6_sk_update_pmtu(skb, sk, info); |
| harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); |
| } |
| if (type == NDISC_REDIRECT) { |
| ip6_sk_redirect(skb, sk); |
| return; |
| } |
| 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) { |
| /* 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, |
| inet6_iif(skb), inet6_iif(skb)))) { |
| 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_access_pointer(sk->sk_filter)) && |
| skb_checksum_complete(skb)) { |
| atomic_inc(&sk->sk_drops); |
| kfree_skb(skb); |
| return NET_RX_DROP; |
| } |
| |
| /* Charge it to the socket. */ |
| skb_dst_drop(skb); |
| if (sock_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 sock *sk, struct msghdr *msg, size_t len, |
| int noblock, int flags, int *addr_len) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
| struct sk_buff *skb; |
| size_t copied; |
| int err; |
| |
| if (flags & MSG_OOB) |
| return -EOPNOTSUPP; |
| |
| if (flags & MSG_ERRQUEUE) |
| return ipv6_recv_error(sk, msg, len, addr_len); |
| |
| if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
| return ipv6_recv_rxpmtu(sk, msg, len, addr_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_msg(skb, 0, msg, copied); |
| } else if (msg->msg_flags&MSG_TRUNC) { |
| if (__skb_checksum_complete(skb)) |
| goto csum_copy_err; |
| err = skb_copy_datagram_msg(skb, 0, msg, copied); |
| } else { |
| err = skb_copy_and_csum_datagram_msg(skb, 0, msg); |
| 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; |
| sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
| sin6->sin6_flowinfo = 0; |
| sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, |
| inet6_iif(skb)); |
| *addr_len = sizeof(*sin6); |
| } |
| |
| sock_recv_ts_and_drops(msg, sk, skb); |
| |
| if (np->rxopt.all) |
| ip6_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; |
| |
| skb = skb_peek(&sk->sk_write_queue); |
| if (!skb) |
| goto out; |
| |
| offset = rp->offset; |
| total_len = inet_sk(sk)->cork.base.length; |
| 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); |
| err = skb_copy_bits(skb, offset, &csum, 2); |
| if (err < 0) { |
| ip6_flush_pending_frames(sk); |
| goto out; |
| } |
| |
| /* 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; |
| |
| BUG_ON(skb_store_bits(skb, offset, &csum, 2)); |
| |
| send: |
| err = ip6_push_pending_frames(sk); |
| out: |
| return err; |
| } |
| |
| static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length, |
| struct flowi6 *fl6, struct dst_entry **dstp, |
| unsigned int flags, const struct sockcm_cookie *sockc) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct net *net = sock_net(sk); |
| struct ipv6hdr *iph; |
| struct sk_buff *skb; |
| int err; |
| struct rt6_info *rt = (struct rt6_info *)*dstp; |
| int hlen = LL_RESERVED_SPACE(rt->dst.dev); |
| int tlen = rt->dst.dev->needed_tailroom; |
| |
| if (length > rt->dst.dev->mtu) { |
| ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu); |
| return -EMSGSIZE; |
| } |
| if (length < sizeof(struct ipv6hdr)) |
| return -EINVAL; |
| if (flags&MSG_PROBE) |
| goto out; |
| |
| skb = sock_alloc_send_skb(sk, |
| length + hlen + tlen + 15, |
| flags & MSG_DONTWAIT, &err); |
| if (!skb) |
| goto error; |
| skb_reserve(skb, hlen); |
| |
| skb->protocol = htons(ETH_P_IPV6); |
| skb->priority = sk->sk_priority; |
| skb->mark = sk->sk_mark; |
| skb->tstamp = sockc->transmit_time; |
| |
| skb_put(skb, length); |
| skb_reset_network_header(skb); |
| iph = ipv6_hdr(skb); |
| |
| 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 = memcpy_from_msg(iph, msg, length); |
| if (err) { |
| err = -EFAULT; |
| kfree_skb(skb); |
| goto error; |
| } |
| |
| skb_dst_set(skb, &rt->dst); |
| *dstp = NULL; |
| |
| /* if egress device is enslaved to an L3 master device pass the |
| * skb to its handler for processing |
| */ |
| skb = l3mdev_ip6_out(sk, skb); |
| if (unlikely(!skb)) |
| return 0; |
| |
| /* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev |
| * in the error path. Since skb has been freed, the dst could |
| * have been queued for deletion. |
| */ |
| rcu_read_lock(); |
| IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); |
| err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb, |
| NULL, rt->dst.dev, dst_output); |
| if (err > 0) |
| err = net_xmit_errno(err); |
| if (err) { |
| IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
| rcu_read_unlock(); |
| goto error_check; |
| } |
| rcu_read_unlock(); |
| out: |
| return 0; |
| |
| error: |
| IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
| error_check: |
| if (err == -ENOBUFS && !np->recverr) |
| err = 0; |
| return err; |
| } |
| |
| struct raw6_frag_vec { |
| struct msghdr *msg; |
| int hlen; |
| char c[4]; |
| }; |
| |
| static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6) |
| { |
| int err = 0; |
| switch (fl6->flowi6_proto) { |
| case IPPROTO_ICMPV6: |
| rfv->hlen = 2; |
| err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen); |
| if (!err) { |
| fl6->fl6_icmp_type = rfv->c[0]; |
| fl6->fl6_icmp_code = rfv->c[1]; |
| } |
| break; |
| case IPPROTO_MH: |
| rfv->hlen = 4; |
| err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen); |
| if (!err) |
| fl6->fl6_mh_type = rfv->c[2]; |
| } |
| return err; |
| } |
| |
| static int raw6_getfrag(void *from, char *to, int offset, int len, int odd, |
| struct sk_buff *skb) |
| { |
| struct raw6_frag_vec *rfv = from; |
| |
| if (offset < rfv->hlen) { |
| int copy = min(rfv->hlen - offset, len); |
| |
| if (skb->ip_summed == CHECKSUM_PARTIAL) |
| memcpy(to, rfv->c + offset, copy); |
| else |
| skb->csum = csum_block_add( |
| skb->csum, |
| csum_partial_copy_nocheck(rfv->c + offset, |
| to, copy, 0), |
| 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 rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
| { |
| struct ipv6_txoptions *opt_to_free = NULL; |
| struct ipv6_txoptions opt_space; |
| DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, 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 raw6_frag_vec rfv; |
| struct flowi6 fl6; |
| struct ipcm6_cookie ipc6; |
| int addr_len = msg->msg_namelen; |
| 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; |
| fl6.flowi6_uid = sk->sk_uid; |
| |
| ipcm6_init(&ipc6); |
| ipc6.sockc.tsflags = sk->sk_tsflags; |
| |
| 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) |
| return -EINVAL; |
| } |
| } |
| |
| /* |
| * Otherwise it will be difficult to maintain |
| * sk->sk_dst_cache. |
| */ |
| if (sk->sk_state == TCP_ESTABLISHED && |
| ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
| daddr = &sk->sk_v6_daddr; |
| |
| if (addr_len >= sizeof(struct sockaddr_in6) && |
| sin6->sin6_scope_id && |
| __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
| fl6.flowi6_oif = sin6->sin6_scope_id; |
| } else { |
| if (sk->sk_state != TCP_ESTABLISHED) |
| return -EDESTADDRREQ; |
| |
| proto = inet->inet_num; |
| daddr = &sk->sk_v6_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); |
| ipc6.opt = opt; |
| |
| err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6); |
| 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) |
| return -EINVAL; |
| } |
| if (!(opt->opt_nflen|opt->opt_flen)) |
| opt = NULL; |
| } |
| if (!opt) { |
| opt = txopt_get(np); |
| opt_to_free = opt; |
| } |
| if (flowlabel) |
| opt = fl6_merge_options(&opt_space, flowlabel, opt); |
| opt = ipv6_fixup_options(&opt_space, opt); |
| |
| fl6.flowi6_proto = proto; |
| rfv.msg = msg; |
| rfv.hlen = 0; |
| err = rawv6_probe_proto_opt(&rfv, &fl6); |
| if (err) |
| goto out; |
| |
| if (!ipv6_addr_any(daddr)) |
| 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)) |
| 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; |
| else if (!fl6.flowi6_oif) |
| fl6.flowi6_oif = np->ucast_oif; |
| security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
| |
| if (inet->hdrincl) |
| fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH; |
| |
| if (ipc6.tclass < 0) |
| ipc6.tclass = np->tclass; |
| |
| fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); |
| |
| dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
| if (IS_ERR(dst)) { |
| err = PTR_ERR(dst); |
| goto out; |
| } |
| if (ipc6.hlimit < 0) |
| ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
| |
| if (ipc6.dontfrag < 0) |
| ipc6.dontfrag = np->dontfrag; |
| |
| if (msg->msg_flags&MSG_CONFIRM) |
| goto do_confirm; |
| |
| back_from_confirm: |
| if (inet->hdrincl) |
| err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst, |
| msg->msg_flags, &ipc6.sockc); |
| else { |
| ipc6.opt = opt; |
| lock_sock(sk); |
| err = ip6_append_data(sk, raw6_getfrag, &rfv, |
| len, 0, &ipc6, &fl6, (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, &fl6, rp); |
| release_sock(sk); |
| } |
| done: |
| dst_release(dst); |
| out: |
| fl6_sock_release(flowlabel); |
| txopt_put(opt_to_free); |
| return err < 0 ? err : len; |
| do_confirm: |
| if (msg->msg_flags & MSG_PROBE) |
| dst_confirm_neigh(dst, &fl6.daddr); |
| 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_HDRINCL: |
| if (sk->sk_type != SOCK_RAW) |
| return -EINVAL; |
| inet_sk(sk)->hdrincl = !!val; |
| return 0; |
| 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; |
| |
| 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 || |
| optname == IPV6_HDRINCL) |
| break; |
| /* fall through */ |
| 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 || |
| optname == IPV6_HDRINCL) |
| break; |
| /* fall through */ |
| 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_HDRINCL: |
| val = inet_sk(sk)->hdrincl; |
| break; |
| 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 || |
| optname == IPV6_HDRINCL) |
| break; |
| /* fall through */ |
| 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 || |
| optname == IPV6_HDRINCL) |
| break; |
| /* fall through */ |
| 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) |
| amount = skb->len; |
| 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_v6_only, |
| .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), |
| .useroffset = offsetof(struct raw6_sock, filter), |
| .usersize = sizeof_field(struct raw6_sock, filter), |
| .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 |
| .diag_destroy = raw_abort, |
| }; |
| |
| #ifdef CONFIG_PROC_FS |
| static int raw6_seq_show(struct seq_file *seq, void *v) |
| { |
| if (v == SEQ_START_TOKEN) { |
| seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); |
| } else { |
| struct sock *sp = v; |
| __u16 srcp = inet_sk(sp)->inet_num; |
| ip6_dgram_sock_seq_show(seq, v, srcp, 0, |
| 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 __net_init raw6_init_net(struct net *net) |
| { |
| if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops, |
| sizeof(struct raw_iter_state), &raw_v6_hashinfo)) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void __net_exit raw6_exit_net(struct net *net) |
| { |
| remove_proc_entry("raw6", net->proc_net); |
| } |
| |
| 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. */ |
| 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 */ |
| .gettstamp = sock_gettstamp, |
| .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, |
| .flags = INET_PROTOSW_REUSE, |
| }; |
| |
| int __init rawv6_init(void) |
| { |
| return inet6_register_protosw(&rawv6_protosw); |
| } |
| |
| void rawv6_exit(void) |
| { |
| inet6_unregister_protosw(&rawv6_protosw); |
| } |