diff options
Diffstat (limited to 'net/ipv6/raw.c')
| -rw-r--r-- | net/ipv6/raw.c | 1157 |
1 files changed, 1157 insertions, 0 deletions
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c new file mode 100644 index 00000000000..5488ad0de4f --- /dev/null +++ b/net/ipv6/raw.c @@ -0,0 +1,1157 @@ +/* + * 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/sched.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 <asm/uaccess.h> +#include <asm/ioctls.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/rawv6.h> +#include <net/xfrm.h> + +#include <linux/proc_fs.h> +#include <linux/seq_file.h> + +struct hlist_head raw_v6_htable[RAWV6_HTABLE_SIZE]; +DEFINE_RWLOCK(raw_v6_lock); + +static void raw_v6_hash(struct sock *sk) +{ + struct hlist_head *list = &raw_v6_htable[inet_sk(sk)->num & + (RAWV6_HTABLE_SIZE - 1)]; + + write_lock_bh(&raw_v6_lock); + sk_add_node(sk, list); + sock_prot_inc_use(sk->sk_prot); + write_unlock_bh(&raw_v6_lock); +} + +static void raw_v6_unhash(struct sock *sk) +{ + write_lock_bh(&raw_v6_lock); + if (sk_del_node_init(sk)) + sock_prot_dec_use(sk->sk_prot); + write_unlock_bh(&raw_v6_lock); +} + + +/* Grumble... icmp and ip_input want to get at this... */ +struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num, + struct in6_addr *loc_addr, struct in6_addr *rmt_addr) +{ + 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 (!ipv6_addr_any(&np->daddr) && + !ipv6_addr_equal(&np->daddr, rmt_addr)) + 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; +} + +/* + * 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. + */ +void ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) +{ + struct in6_addr *saddr; + struct in6_addr *daddr; + struct sock *sk; + __u8 hash; + + saddr = &skb->nh.ipv6h->saddr; + daddr = saddr + 1; + + hash = nexthdr & (MAX_INET_PROTOS - 1); + + read_lock(&raw_v6_lock); + sk = sk_head(&raw_v6_htable[hash]); + + /* + * The first socket found will be delivered after + * delivery to transport protocols. + */ + + if (sk == NULL) + goto out; + + sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr); + + while (sk) { + if (nexthdr != IPPROTO_ICMPV6 || !icmpv6_filter(sk, skb)) { + struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); + + /* Not releasing hash table! */ + if (clone) + rawv6_rcv(sk, clone); + } + sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr); + } +out: + read_unlock(&raw_v6_lock); +} + +/* 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; + __u32 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(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(&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; +} + +void rawv6_err(struct sock *sk, struct sk_buff *skb, + struct inet6_skb_parm *opt, + int type, int code, int offset, u32 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); + } +} + +static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb) +{ + if ((raw6_sk(sk)->checksum || sk->sk_filter) && + skb->ip_summed != CHECKSUM_UNNECESSARY) { + if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) { + /* FIXME: increment a raw6 drops counter here */ + kfree_skb(skb); + return 0; + } + skb->ip_summed = CHECKSUM_UNNECESSARY; + } + + /* Charge it to the socket. */ + if (sock_queue_rcv_skb(sk,skb)<0) { + /* FIXME: increment a raw6 drops counter here */ + 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)) { + kfree_skb(skb); + return NET_RX_DROP; + } + + if (!rp->checksum) + skb->ip_summed = CHECKSUM_UNNECESSARY; + + if (skb->ip_summed != CHECKSUM_UNNECESSARY) { + if (skb->ip_summed == CHECKSUM_HW) { + skb->ip_summed = CHECKSUM_UNNECESSARY; + if (csum_ipv6_magic(&skb->nh.ipv6h->saddr, + &skb->nh.ipv6h->daddr, + skb->len, inet->num, skb->csum)) { + LIMIT_NETDEBUG( + printk(KERN_DEBUG "raw v6 hw csum failure.\n")); + skb->ip_summed = CHECKSUM_NONE; + } + } + if (skb->ip_summed == CHECKSUM_NONE) + skb->csum = ~csum_ipv6_magic(&skb->nh.ipv6h->saddr, + &skb->nh.ipv6h->daddr, + skb->len, inet->num, 0); + } + + if (inet->hdrincl) { + if (skb->ip_summed != CHECKSUM_UNNECESSARY && + (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) { + /* FIXME: increment a raw6 drops counter here */ + kfree_skb(skb); + return 0; + } + skb->ip_summed = CHECKSUM_UNNECESSARY; + } + + 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->ip_summed==CHECKSUM_UNNECESSARY) { + err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); + } else if (msg->msg_flags&MSG_TRUNC) { + if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) + 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; + ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->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: + /* Clear queue. */ + if (flags&MSG_PEEK) { + int clear = 0; + spin_lock_irq(&sk->sk_receive_queue.lock); + if (skb == skb_peek(&sk->sk_receive_queue)) { + __skb_unlink(skb, &sk->sk_receive_queue); + clear = 1; + } + spin_unlock_irq(&sk->sk_receive_queue.lock); + if (clear) + kfree_skb(skb); + } + + /* Error for blocking case is chosen to masquerade + as some normal condition. + */ + err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; + /* FIXME: increment a raw6 drops counter here */ + goto out_free; +} + +static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl, + struct raw6_sock *rp, int len) +{ + struct sk_buff *skb; + int err = 0; + u16 *csum; + u32 tmp_csum; + + if (!rp->checksum) + goto send; + + if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) + goto out; + + if (rp->offset + 1 < len) + csum = (u16 *)(skb->h.raw + rp->offset); + else { + err = -EINVAL; + 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 { + tmp_csum = 0; + + skb_queue_walk(&sk->sk_write_queue, skb) { + tmp_csum = csum_add(tmp_csum, skb->csum); + } + } + + /* in case cksum was not initialized */ + if (unlikely(*csum)) + tmp_csum = csum_sub(tmp_csum, *csum); + + *csum = csum_ipv6_magic(&fl->fl6_src, + &fl->fl6_dst, + len, fl->proto, tmp_csum); + + if (*csum == 0) + *csum = -1; +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 inet_sock *inet = inet_sk(sk); + struct ipv6hdr *iph; + struct sk_buff *skb; + unsigned int hh_len; + 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; + + hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); + + skb = sock_alloc_send_skb(sk, length+hh_len+15, + flags&MSG_DONTWAIT, &err); + if (skb == NULL) + goto error; + skb_reserve(skb, hh_len); + + skb->priority = sk->sk_priority; + skb->dst = dst_clone(&rt->u.dst); + + skb->nh.ipv6h = iph = (struct ipv6hdr *)skb_put(skb, length); + + skb->ip_summed = CHECKSUM_NONE; + + skb->h.raw = skb->nh.raw; + err = memcpy_fromiovecend((void *)iph, from, 0, length); + if (err) + goto error_fault; + + IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); + err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev, + dst_output); + if (err > 0) + err = inet->recverr ? net_xmit_errno(err) : 0; + if (err) + goto error; +out: + return 0; + +error_fault: + err = -EFAULT; + kfree_skb(skb); +error: + IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); + return err; +} + +static void rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg) +{ + struct iovec *iov; + u8 __user *type = NULL; + u8 __user *code = NULL; + int probed = 0; + int i; + + if (!msg->msg_iov) + return; + + 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) { + get_user(fl->fl_icmp_type, type); + __get_user(fl->fl_icmp_code, code); + probed = 1; + } + break; + default: + probed = 1; + break; + } + if (probed) + break; + } +} + +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; + u16 proto; + int err; + + /* Rough check on arithmetic overflow, + better check is made in ip6_build_xmit + */ + if (len < 0) + 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)); + + 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 (ipv6_addr_any(daddr)) { + /* + * unspecified destination address + * treated as error... is this correct ? + */ + fl6_sock_release(flowlabel); + return(-EINVAL); + } + + 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); + 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); + + fl.proto = proto; + rawv6_probe_proto_opt(&fl, msg); + + ipv6_addr_copy(&fl.fl6_dst, daddr); + 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; + + 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, 0)) < 0) { + dst_release(dst); + 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 = dst_metric(dst, RTAX_HOPLIMIT); + if (hlimit < 0) + hlimit = ipv6_get_hoplimit(dst->dev); + } + + 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, 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, len); + } +done: + ip6_dst_store(sk, dst, + ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? + &np->daddr : NULL); + if (err > 0) + err = np->recverr ? net_xmit_errno(err) : 0; + + release_sock(sk); +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 rawv6_setsockopt(struct sock *sk, int level, int optname, + char __user *optval, int optlen) +{ + struct raw6_sock *rp = raw6_sk(sk); + int val; + + 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); + }; + + if (get_user(val, (int __user *)optval)) + return -EFAULT; + + switch (optname) { + case IPV6_CHECKSUM: + /* 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_getsockopt(struct sock *sk, int level, int optname, + char __user *optval, int __user *optlen) +{ + struct raw6_sock *rp = raw6_sk(sk); + int val, len; + + 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); + }; + + if (get_user(len,optlen)) + return -EFAULT; + + switch (optname) { + case IPV6_CHECKSUM: + 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_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_irq(&sk->sk_receive_queue.lock); + skb = skb_peek(&sk->sk_receive_queue); + if (skb != NULL) + amount = skb->tail - skb->h.raw; + spin_unlock_irq(&sk->sk_receive_queue.lock); + return put_user(amount, (int __user *)arg); + } + + default: + return -ENOIOCTLCMD; + } +} + +static void rawv6_close(struct sock *sk, long timeout) +{ + if (inet_sk(sk)->num == IPPROTO_RAW) + ip6_ra_control(sk, -1, NULL); + + sk_common_release(sk); +} + +static int rawv6_init_sk(struct sock *sk) +{ + if (inet_sk(sk)->num == IPPROTO_ICMPV6) { + struct raw6_sock *rp = raw6_sk(sk); + rp->checksum = 1; + rp->offset = 2; + } + 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_v6_hash, + .unhash = raw_v6_unhash, + .obj_size = sizeof(struct raw6_sock), +}; + +#ifdef CONFIG_PROC_FS +struct raw6_iter_state { + int bucket; +}; + +#define raw6_seq_private(seq) ((struct raw6_iter_state *)(seq)->private) + +static struct sock *raw6_get_first(struct seq_file *seq) +{ + struct sock *sk; + struct hlist_node *node; + struct raw6_iter_state* state = raw6_seq_private(seq); + + for (state->bucket = 0; state->bucket < RAWV6_HTABLE_SIZE; ++state->bucket) + sk_for_each(sk, node, &raw_v6_htable[state->bucket]) + if (sk->sk_family == PF_INET6) + goto out; + sk = NULL; +out: + return sk; +} + +static struct sock *raw6_get_next(struct seq_file *seq, struct sock *sk) +{ + struct raw6_iter_state* state = raw6_seq_private(seq); + + do { + sk = sk_next(sk); +try_again: + ; + } while (sk && sk->sk_family != PF_INET6); + + if (!sk && ++state->bucket < RAWV6_HTABLE_SIZE) { + sk = sk_head(&raw_v6_htable[state->bucket]); + goto try_again; + } + return sk; +} + +static struct sock *raw6_get_idx(struct seq_file *seq, loff_t pos) +{ + struct sock *sk = raw6_get_first(seq); + if (sk) + while (pos && (sk = raw6_get_next(seq, sk)) != NULL) + --pos; + return pos ? NULL : sk; +} + +static void *raw6_seq_start(struct seq_file *seq, loff_t *pos) +{ + read_lock(&raw_v6_lock); + return *pos ? raw6_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; +} + +static void *raw6_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct sock *sk; + + if (v == SEQ_START_TOKEN) + sk = raw6_get_first(seq); + else + sk = raw6_get_next(seq, v); + ++*pos; + return sk; +} + +static void raw6_seq_stop(struct seq_file *seq, void *v) +{ + read_unlock(&raw_v6_lock); +} + +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\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); +} + +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\n"); + else + raw6_sock_seq_show(seq, v, raw6_seq_private(seq)->bucket); + return 0; +} + +static struct seq_operations raw6_seq_ops = { + .start = raw6_seq_start, + .next = raw6_seq_next, + .stop = raw6_seq_stop, + .show = raw6_seq_show, +}; + +static int raw6_seq_open(struct inode *inode, struct file *file) +{ + struct seq_file *seq; + int rc = -ENOMEM; + struct raw6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); + if (!s) + goto out; + rc = seq_open(file, &raw6_seq_ops); + if (rc) + goto out_kfree; + seq = file->private_data; + seq->private = s; + memset(s, 0, sizeof(*s)); +out: + return rc; +out_kfree: + kfree(s); + goto out; +} + +static struct file_operations raw6_seq_fops = { + .owner = THIS_MODULE, + .open = raw6_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_private, +}; + +int __init raw6_proc_init(void) +{ + if (!proc_net_fops_create("raw6", S_IRUGO, &raw6_seq_fops)) + return -ENOMEM; + return 0; +} + +void raw6_proc_exit(void) +{ + proc_net_remove("raw6"); +} +#endif /* CONFIG_PROC_FS */ |