[funini.com] -> [kei@sodan] -> Kernel Reading

root/net/ipv6/raw.c

/* [<][>][^][v][top][bottom][index][help] */

DEFINITIONS

This source file includes following definitions.
  1. __raw_v6_lookup
  2. icmpv6_filter
  3. rawv6_mh_filter_register
  4. rawv6_mh_filter_unregister
  5. ipv6_raw_deliver
  6. raw6_local_deliver
  7. rawv6_bind
  8. rawv6_err
  9. raw6_icmp_error
  10. rawv6_rcv_skb
  11. rawv6_rcv
  12. rawv6_recvmsg
  13. rawv6_push_pending_frames
  14. rawv6_send_hdrinc
  15. rawv6_probe_proto_opt
  16. rawv6_sendmsg
  17. rawv6_seticmpfilter
  18. rawv6_geticmpfilter
  19. do_rawv6_setsockopt
  20. rawv6_setsockopt
  21. compat_rawv6_setsockopt
  22. do_rawv6_getsockopt
  23. rawv6_getsockopt
  24. compat_rawv6_getsockopt
  25. rawv6_ioctl
  26. rawv6_close
  27. raw6_destroy
  28. rawv6_init_sk
  29. raw6_sock_seq_show
  30. raw6_seq_show
  31. raw6_seq_open
  32. raw6_init_net
  33. raw6_exit_net
  34. raw6_proc_init
  35. raw6_proc_exit
  36. rawv6_init
  37. rawv6_exit

/*
 *      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/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 NET_RX_DROP;
        }

        /* Charge it to the socket. */
        if (sock_queue_rcv_skb(sk,skb)<0) {
                atomic_inc(&sk->sk_drops);
                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->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 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);

        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(sock_net(sk), 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(sock_net(sk), 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(sock_net(sk), 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);
        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)->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,
#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 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 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);
}

/* [<][>][^][v][top][bottom][index][help] */

[funini.com] -> [kei@sodan] -> Kernel Reading