diff options
Diffstat (limited to 'net/ipv6/ipv6_sockglue.c')
| -rw-r--r-- | net/ipv6/ipv6_sockglue.c | 704 |
1 files changed, 704 insertions, 0 deletions
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c new file mode 100644 index 00000000000..279ab86be66 --- /dev/null +++ b/net/ipv6/ipv6_sockglue.c @@ -0,0 +1,704 @@ +/* + * IPv6 BSD socket options interface + * Linux INET6 implementation + * + * Authors: + * Pedro Roque <roque@di.fc.ul.pt> + * + * Based on linux/net/ipv4/ip_sockglue.c + * + * $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $ + * + * 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. + * + * FIXME: Make the setsockopt code POSIX compliant: That is + * + * o Return -EINVAL for setsockopt of short lengths + * o Truncate getsockopt returns + * o Return an optlen of the truncated length if need be + * + * Changes: + * David L Stevens <dlstevens@us.ibm.com>: + * - added multicast source filtering API for MLDv2 + */ + +#include <linux/module.h> +#include <linux/config.h> +#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/init.h> +#include <linux/sysctl.h> +#include <linux/netfilter.h> + +#include <net/sock.h> +#include <net/snmp.h> +#include <net/ipv6.h> +#include <net/ndisc.h> +#include <net/protocol.h> +#include <net/transp_v6.h> +#include <net/ip6_route.h> +#include <net/addrconf.h> +#include <net/inet_common.h> +#include <net/tcp.h> +#include <net/udp.h> +#include <net/xfrm.h> + +#include <asm/uaccess.h> + +DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics); + +static struct packet_type ipv6_packet_type = { + .type = __constant_htons(ETH_P_IPV6), + .func = ipv6_rcv, +}; + +struct ip6_ra_chain *ip6_ra_chain; +DEFINE_RWLOCK(ip6_ra_lock); + +int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *)) +{ + struct ip6_ra_chain *ra, *new_ra, **rap; + + /* RA packet may be delivered ONLY to IPPROTO_RAW socket */ + if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW) + return -EINVAL; + + new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; + + write_lock_bh(&ip6_ra_lock); + for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) { + if (ra->sk == sk) { + if (sel>=0) { + write_unlock_bh(&ip6_ra_lock); + if (new_ra) + kfree(new_ra); + return -EADDRINUSE; + } + + *rap = ra->next; + write_unlock_bh(&ip6_ra_lock); + + if (ra->destructor) + ra->destructor(sk); + sock_put(sk); + kfree(ra); + return 0; + } + } + if (new_ra == NULL) { + write_unlock_bh(&ip6_ra_lock); + return -ENOBUFS; + } + new_ra->sk = sk; + new_ra->sel = sel; + new_ra->destructor = destructor; + new_ra->next = ra; + *rap = new_ra; + sock_hold(sk); + write_unlock_bh(&ip6_ra_lock); + return 0; +} + +extern int ip6_mc_source(int add, int omode, struct sock *sk, + struct group_source_req *pgsr); +extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); +extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, + struct group_filter __user *optval, int __user *optlen); + + +int ipv6_setsockopt(struct sock *sk, int level, int optname, + char __user *optval, int optlen) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + int val, valbool; + int retv = -ENOPROTOOPT; + + if (level == SOL_IP && sk->sk_type != SOCK_RAW) + return udp_prot.setsockopt(sk, level, optname, optval, optlen); + + if(level!=SOL_IPV6) + goto out; + + if (optval == NULL) + val=0; + else if (get_user(val, (int __user *) optval)) + return -EFAULT; + + valbool = (val!=0); + + lock_sock(sk); + + switch (optname) { + + case IPV6_ADDRFORM: + if (val == PF_INET) { + struct ipv6_txoptions *opt; + struct sk_buff *pktopt; + + if (sk->sk_protocol != IPPROTO_UDP && + sk->sk_protocol != IPPROTO_TCP) + break; + + if (sk->sk_state != TCP_ESTABLISHED) { + retv = -ENOTCONN; + break; + } + + if (ipv6_only_sock(sk) || + !(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) { + retv = -EADDRNOTAVAIL; + break; + } + + fl6_free_socklist(sk); + ipv6_sock_mc_close(sk); + + if (sk->sk_protocol == IPPROTO_TCP) { + struct tcp_sock *tp = tcp_sk(sk); + + local_bh_disable(); + sock_prot_dec_use(sk->sk_prot); + sock_prot_inc_use(&tcp_prot); + local_bh_enable(); + sk->sk_prot = &tcp_prot; + tp->af_specific = &ipv4_specific; + sk->sk_socket->ops = &inet_stream_ops; + sk->sk_family = PF_INET; + tcp_sync_mss(sk, tp->pmtu_cookie); + } else { + local_bh_disable(); + sock_prot_dec_use(sk->sk_prot); + sock_prot_inc_use(&udp_prot); + local_bh_enable(); + sk->sk_prot = &udp_prot; + sk->sk_socket->ops = &inet_dgram_ops; + sk->sk_family = PF_INET; + } + opt = xchg(&np->opt, NULL); + if (opt) + sock_kfree_s(sk, opt, opt->tot_len); + pktopt = xchg(&np->pktoptions, NULL); + if (pktopt) + kfree_skb(pktopt); + + sk->sk_destruct = inet_sock_destruct; +#ifdef INET_REFCNT_DEBUG + atomic_dec(&inet6_sock_nr); +#endif + module_put(THIS_MODULE); + retv = 0; + break; + } + goto e_inval; + + case IPV6_V6ONLY: + if (inet_sk(sk)->num) + goto e_inval; + np->ipv6only = valbool; + retv = 0; + break; + + case IPV6_PKTINFO: + np->rxopt.bits.rxinfo = valbool; + retv = 0; + break; + + case IPV6_HOPLIMIT: + np->rxopt.bits.rxhlim = valbool; + retv = 0; + break; + + case IPV6_RTHDR: + if (val < 0 || val > 2) + goto e_inval; + np->rxopt.bits.srcrt = val; + retv = 0; + break; + + case IPV6_HOPOPTS: + np->rxopt.bits.hopopts = valbool; + retv = 0; + break; + + case IPV6_DSTOPTS: + np->rxopt.bits.dstopts = valbool; + retv = 0; + break; + + case IPV6_FLOWINFO: + np->rxopt.bits.rxflow = valbool; + retv = 0; + break; + + case IPV6_PKTOPTIONS: + { + struct ipv6_txoptions *opt = NULL; + struct msghdr msg; + struct flowi fl; + int junk; + + fl.fl6_flowlabel = 0; + fl.oif = sk->sk_bound_dev_if; + + if (optlen == 0) + goto update; + + /* 1K is probably excessive + * 1K is surely not enough, 2K per standard header is 16K. + */ + retv = -EINVAL; + if (optlen > 64*1024) + break; + + opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL); + retv = -ENOBUFS; + if (opt == NULL) + break; + + memset(opt, 0, sizeof(*opt)); + opt->tot_len = sizeof(*opt) + optlen; + retv = -EFAULT; + if (copy_from_user(opt+1, optval, optlen)) + goto done; + + msg.msg_controllen = optlen; + msg.msg_control = (void*)(opt+1); + + retv = datagram_send_ctl(&msg, &fl, opt, &junk); + if (retv) + goto done; +update: + retv = 0; + if (sk->sk_type == SOCK_STREAM) { + if (opt) { + struct tcp_sock *tp = tcp_sk(sk); + if (!((1 << sk->sk_state) & + (TCPF_LISTEN | TCPF_CLOSE)) + && inet_sk(sk)->daddr != LOOPBACK4_IPV6) { + tp->ext_header_len = opt->opt_flen + opt->opt_nflen; + tcp_sync_mss(sk, tp->pmtu_cookie); + } + } + opt = xchg(&np->opt, opt); + sk_dst_reset(sk); + } else { + write_lock(&sk->sk_dst_lock); + opt = xchg(&np->opt, opt); + write_unlock(&sk->sk_dst_lock); + sk_dst_reset(sk); + } + +done: + if (opt) + sock_kfree_s(sk, opt, opt->tot_len); + break; + } + case IPV6_UNICAST_HOPS: + if (val > 255 || val < -1) + goto e_inval; + np->hop_limit = val; + retv = 0; + break; + + case IPV6_MULTICAST_HOPS: + if (sk->sk_type == SOCK_STREAM) + goto e_inval; + if (val > 255 || val < -1) + goto e_inval; + np->mcast_hops = val; + retv = 0; + break; + + case IPV6_MULTICAST_LOOP: + np->mc_loop = valbool; + retv = 0; + break; + + case IPV6_MULTICAST_IF: + if (sk->sk_type == SOCK_STREAM) + goto e_inval; + if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val) + goto e_inval; + + if (__dev_get_by_index(val) == NULL) { + retv = -ENODEV; + break; + } + np->mcast_oif = val; + retv = 0; + break; + case IPV6_ADD_MEMBERSHIP: + case IPV6_DROP_MEMBERSHIP: + { + struct ipv6_mreq mreq; + + retv = -EFAULT; + if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) + break; + + if (optname == IPV6_ADD_MEMBERSHIP) + retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); + else + retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr); + break; + } + case IPV6_JOIN_ANYCAST: + case IPV6_LEAVE_ANYCAST: + { + struct ipv6_mreq mreq; + + if (optlen != sizeof(struct ipv6_mreq)) + goto e_inval; + + retv = -EFAULT; + if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq))) + break; + + if (optname == IPV6_JOIN_ANYCAST) + retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); + else + retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr); + break; + } + case MCAST_JOIN_GROUP: + case MCAST_LEAVE_GROUP: + { + struct group_req greq; + struct sockaddr_in6 *psin6; + + retv = -EFAULT; + if (copy_from_user(&greq, optval, sizeof(struct group_req))) + break; + if (greq.gr_group.ss_family != AF_INET6) { + retv = -EADDRNOTAVAIL; + break; + } + psin6 = (struct sockaddr_in6 *)&greq.gr_group; + if (optname == MCAST_JOIN_GROUP) + retv = ipv6_sock_mc_join(sk, greq.gr_interface, + &psin6->sin6_addr); + else + retv = ipv6_sock_mc_drop(sk, greq.gr_interface, + &psin6->sin6_addr); + break; + } + case MCAST_JOIN_SOURCE_GROUP: + case MCAST_LEAVE_SOURCE_GROUP: + case MCAST_BLOCK_SOURCE: + case MCAST_UNBLOCK_SOURCE: + { + struct group_source_req greqs; + int omode, add; + + if (optlen != sizeof(struct group_source_req)) + goto e_inval; + if (copy_from_user(&greqs, optval, sizeof(greqs))) { + retv = -EFAULT; + break; + } + if (greqs.gsr_group.ss_family != AF_INET6 || + greqs.gsr_source.ss_family != AF_INET6) { + retv = -EADDRNOTAVAIL; + break; + } + if (optname == MCAST_BLOCK_SOURCE) { + omode = MCAST_EXCLUDE; + add = 1; + } else if (optname == MCAST_UNBLOCK_SOURCE) { + omode = MCAST_EXCLUDE; + add = 0; + } else if (optname == MCAST_JOIN_SOURCE_GROUP) { + struct sockaddr_in6 *psin6; + + psin6 = (struct sockaddr_in6 *)&greqs.gsr_group; + retv = ipv6_sock_mc_join(sk, greqs.gsr_interface, + &psin6->sin6_addr); + if (retv) + break; + omode = MCAST_INCLUDE; + add = 1; + } else /*IP_DROP_SOURCE_MEMBERSHIP */ { + omode = MCAST_INCLUDE; + add = 0; + } + retv = ip6_mc_source(add, omode, sk, &greqs); + break; + } + case MCAST_MSFILTER: + { + extern int sysctl_optmem_max; + extern int sysctl_mld_max_msf; + struct group_filter *gsf; + + if (optlen < GROUP_FILTER_SIZE(0)) + goto e_inval; + if (optlen > sysctl_optmem_max) { + retv = -ENOBUFS; + break; + } + gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL); + if (gsf == 0) { + retv = -ENOBUFS; + break; + } + retv = -EFAULT; + if (copy_from_user(gsf, optval, optlen)) { + kfree(gsf); + break; + } + /* numsrc >= (4G-140)/128 overflow in 32 bits */ + if (gsf->gf_numsrc >= 0x1ffffffU || + gsf->gf_numsrc > sysctl_mld_max_msf) { + kfree(gsf); + retv = -ENOBUFS; + break; + } + if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { + kfree(gsf); + retv = -EINVAL; + break; + } + retv = ip6_mc_msfilter(sk, gsf); + kfree(gsf); + + break; + } + case IPV6_ROUTER_ALERT: + retv = ip6_ra_control(sk, val, NULL); + break; + case IPV6_MTU_DISCOVER: + if (val<0 || val>2) + goto e_inval; + np->pmtudisc = val; + retv = 0; + break; + case IPV6_MTU: + if (val && val < IPV6_MIN_MTU) + goto e_inval; + np->frag_size = val; + retv = 0; + break; + case IPV6_RECVERR: + np->recverr = valbool; + if (!val) + skb_queue_purge(&sk->sk_error_queue); + retv = 0; + break; + case IPV6_FLOWINFO_SEND: + np->sndflow = valbool; + retv = 0; + break; + case IPV6_FLOWLABEL_MGR: + retv = ipv6_flowlabel_opt(sk, optval, optlen); + break; + case IPV6_IPSEC_POLICY: + case IPV6_XFRM_POLICY: + retv = xfrm_user_policy(sk, optname, optval, optlen); + break; + +#ifdef CONFIG_NETFILTER + default: + retv = nf_setsockopt(sk, PF_INET6, optname, optval, + optlen); + break; +#endif + + } + release_sock(sk); + +out: + return retv; + +e_inval: + release_sock(sk); + return -EINVAL; +} + +int ipv6_getsockopt(struct sock *sk, int level, int optname, + char __user *optval, int __user *optlen) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + int len; + int val; + + if (level == SOL_IP && sk->sk_type != SOCK_RAW) + return udp_prot.getsockopt(sk, level, optname, optval, optlen); + if(level!=SOL_IPV6) + return -ENOPROTOOPT; + if (get_user(len, optlen)) + return -EFAULT; + switch (optname) { + case IPV6_ADDRFORM: + if (sk->sk_protocol != IPPROTO_UDP && + sk->sk_protocol != IPPROTO_TCP) + return -EINVAL; + if (sk->sk_state != TCP_ESTABLISHED) + return -ENOTCONN; + val = sk->sk_family; + break; + case MCAST_MSFILTER: + { + struct group_filter gsf; + int err; + + if (len < GROUP_FILTER_SIZE(0)) + return -EINVAL; + if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) + return -EFAULT; + lock_sock(sk); + err = ip6_mc_msfget(sk, &gsf, + (struct group_filter __user *)optval, optlen); + release_sock(sk); + return err; + } + + case IPV6_PKTOPTIONS: + { + struct msghdr msg; + struct sk_buff *skb; + + if (sk->sk_type != SOCK_STREAM) + return -ENOPROTOOPT; + + msg.msg_control = optval; + msg.msg_controllen = len; + msg.msg_flags = 0; + + lock_sock(sk); + skb = np->pktoptions; + if (skb) + atomic_inc(&skb->users); + release_sock(sk); + + if (skb) { + int err = datagram_recv_ctl(sk, &msg, skb); + kfree_skb(skb); + if (err) + return err; + } else { + if (np->rxopt.bits.rxinfo) { + struct in6_pktinfo src_info; + src_info.ipi6_ifindex = np->mcast_oif; + ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr); + put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); + } + if (np->rxopt.bits.rxhlim) { + int hlim = np->mcast_hops; + put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); + } + } + len -= msg.msg_controllen; + return put_user(len, optlen); + } + case IPV6_MTU: + { + struct dst_entry *dst; + val = 0; + lock_sock(sk); + dst = sk_dst_get(sk); + if (dst) { + val = dst_mtu(dst); + dst_release(dst); + } + release_sock(sk); + if (!val) + return -ENOTCONN; + break; + } + + case IPV6_V6ONLY: + val = np->ipv6only; + break; + + case IPV6_PKTINFO: + val = np->rxopt.bits.rxinfo; + break; + + case IPV6_HOPLIMIT: + val = np->rxopt.bits.rxhlim; + break; + + case IPV6_RTHDR: + val = np->rxopt.bits.srcrt; + break; + + case IPV6_HOPOPTS: + val = np->rxopt.bits.hopopts; + break; + + case IPV6_DSTOPTS: + val = np->rxopt.bits.dstopts; + break; + + case IPV6_FLOWINFO: + val = np->rxopt.bits.rxflow; + break; + + case IPV6_UNICAST_HOPS: + val = np->hop_limit; + break; + + case IPV6_MULTICAST_HOPS: + val = np->mcast_hops; + break; + + case IPV6_MULTICAST_LOOP: + val = np->mc_loop; + break; + + case IPV6_MULTICAST_IF: + val = np->mcast_oif; + break; + + case IPV6_MTU_DISCOVER: + val = np->pmtudisc; + break; + + case IPV6_RECVERR: + val = np->recverr; + break; + + case IPV6_FLOWINFO_SEND: + val = np->sndflow; + break; + + default: +#ifdef CONFIG_NETFILTER + lock_sock(sk); + val = nf_getsockopt(sk, PF_INET6, optname, optval, + &len); + release_sock(sk); + if (val >= 0) + val = put_user(len, optlen); + return val; +#else + return -EINVAL; +#endif + } + 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; +} + +void __init ipv6_packet_init(void) +{ + dev_add_pack(&ipv6_packet_type); +} + +void ipv6_packet_cleanup(void) +{ + dev_remove_pack(&ipv6_packet_type); +} |