/* * 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 <linux/skbuff.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/tcp_states.h> #ifdef CONFIG_IPV6_MIP6 #include <net/mip6.h> #endif #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, 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 (!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; } /* * 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. */ 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; 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, IP6CB(skb)->iif); while (sk) { int filtered; delivered = 1; switch (nexthdr) { case IPPROTO_ICMPV6: filtered = icmpv6_filter(sk, skb); break; #ifdef 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. */ filtered = mip6_mh_filter(sk, skb); 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(sk_next(sk), nexthdr, daddr, saddr, IP6CB(skb)->iif); } out: read_unlock(&raw_v6_lock); return delivered; } /* 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(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, __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); } } 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)) { /* FIXME: increment a raw6 drops counter here */ kfree_skb(skb); return 0; } /* 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_COMPLETE) { skb_postpull_rcsum(skb, skb->nh.raw, skb->h.raw - skb->nh.raw); if (!csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr, skb->len, inet->num, skb->csum)) skb->ip_summed = CHECKSUM_UNNECESSARY; } if (skb->ip_summed != CHECKSUM_UNNECESSARY) skb->csum = ~csum_unfold(csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr, skb->len, inet->num, 0)); if (inet->hdrincl) { if (skb_checksum_complete(skb)) { /* FIXME: increment a raw6 drops counter here */ kfree_skb(skb); return 0; } } rawv6_rcv_skb(sk, skb); return 0; } /* * This should be easy, if there is something there * we return it, otherwise we block. */ static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len, int noblock, int flags, int *addr_len) { struct ipv6_pinfo *np = inet6_sk(sk); struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; struct sk_buff *skb; size_t copied; int err; if (flags & MSG_OOB) return -EOPNOTSUPP; if (addr_len) *addr_len=sizeof(*sin6); if (flags & MSG_ERRQUEUE) return ipv6_recv_error(sk, msg, len); skb = skb_recv_datagram(sk, flags, noblock, &err); if (!skb) goto out; copied = skb->len; if (copied > len) { copied = len; msg->msg_flags |= MSG_TRUNC; } if (skb->ip_summed==CHECKSUM_UNNECESSARY) { 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, &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: skb_kill_datagram(sk, skb, flags); /* 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; } 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->nh.raw - 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->h.raw - skb->data); if (offset >= len) { offset -= len; continue; } csum_skb = skb; } skb = csum_skb; } offset += skb->h.raw - skb->data; 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; 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(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS); err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev, dst_output); if (err > 0) err = np->recverr ? net_xmit_errno(err) : 0; if (err) goto error; out: return 0; error_fault: err = -EFAULT; kfree_skb(skb); error: IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); return err; } static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg) { struct iovec *iov; u8 __user *type = NULL; u8 __user *code = NULL; #ifdef CONFIG_IPV6_MIP6 u8 len = 0; #endif 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; #ifdef CONFIG_IPV6_MIP6 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; #endif 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_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, &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; 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; 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, 0)) < 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 = dst_metric(dst, RTAX_HOPLIMIT); if (hlimit < 0) hlimit = ipv6_get_hoplimit(dst->dev); } 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); } done: dst_release(dst); 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 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: /* 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: 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->h.raw; spin_unlock_bh(&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_COMPAT .compat_setsockopt = compat_rawv6_setsockopt, .compat_getsockopt = compat_rawv6_getsockopt, #endif }; #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 = kzalloc(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; 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 */