| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * The IP to API glue. |
| * |
| * Authors: see ip.c |
| * |
| * Fixes: |
| * Many : Split from ip.c , see ip.c for history. |
| * Martin Mares : TOS setting fixed. |
| * Alan Cox : Fixed a couple of oopses in Martin's |
| * TOS tweaks. |
| * Mike McLagan : Routing by source |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/mm.h> |
| #include <linux/skbuff.h> |
| #include <linux/ip.h> |
| #include <linux/icmp.h> |
| #include <linux/inetdevice.h> |
| #include <linux/netdevice.h> |
| #include <linux/slab.h> |
| #include <net/sock.h> |
| #include <net/ip.h> |
| #include <net/icmp.h> |
| #include <net/tcp_states.h> |
| #include <linux/udp.h> |
| #include <linux/igmp.h> |
| #include <linux/netfilter.h> |
| #include <linux/route.h> |
| #include <linux/mroute.h> |
| #include <net/inet_ecn.h> |
| #include <net/route.h> |
| #include <net/xfrm.h> |
| #include <net/compat.h> |
| #if IS_ENABLED(CONFIG_IPV6) |
| #include <net/transp_v6.h> |
| #endif |
| |
| #include <linux/errqueue.h> |
| #include <asm/uaccess.h> |
| |
| #define IP_CMSG_PKTINFO 1 |
| #define IP_CMSG_TTL 2 |
| #define IP_CMSG_TOS 4 |
| #define IP_CMSG_RECVOPTS 8 |
| #define IP_CMSG_RETOPTS 16 |
| #define IP_CMSG_PASSSEC 32 |
| #define IP_CMSG_ORIGDSTADDR 64 |
| |
| /* |
| * SOL_IP control messages. |
| */ |
| #define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb)) |
| |
| static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) |
| { |
| struct in_pktinfo info = *PKTINFO_SKB_CB(skb); |
| |
| info.ipi_addr.s_addr = ip_hdr(skb)->daddr; |
| |
| put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); |
| } |
| |
| static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) |
| { |
| int ttl = ip_hdr(skb)->ttl; |
| put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); |
| } |
| |
| static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) |
| { |
| put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); |
| } |
| |
| static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) |
| { |
| if (IPCB(skb)->opt.optlen == 0) |
| return; |
| |
| put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, |
| ip_hdr(skb) + 1); |
| } |
| |
| |
| static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) |
| { |
| unsigned char optbuf[sizeof(struct ip_options) + 40]; |
| struct ip_options * opt = (struct ip_options *)optbuf; |
| |
| if (IPCB(skb)->opt.optlen == 0) |
| return; |
| |
| if (ip_options_echo(opt, skb)) { |
| msg->msg_flags |= MSG_CTRUNC; |
| return; |
| } |
| ip_options_undo(opt); |
| |
| put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); |
| } |
| |
| static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) |
| { |
| char *secdata; |
| u32 seclen, secid; |
| int err; |
| |
| err = security_socket_getpeersec_dgram(NULL, skb, &secid); |
| if (err) |
| return; |
| |
| err = security_secid_to_secctx(secid, &secdata, &seclen); |
| if (err) |
| return; |
| |
| put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); |
| security_release_secctx(secdata, seclen); |
| } |
| |
| static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) |
| { |
| struct sockaddr_in sin; |
| const struct iphdr *iph = ip_hdr(skb); |
| __be16 *ports = (__be16 *)skb_transport_header(skb); |
| |
| if (skb_transport_offset(skb) + 4 > skb->len) |
| return; |
| |
| /* All current transport protocols have the port numbers in the |
| * first four bytes of the transport header and this function is |
| * written with this assumption in mind. |
| */ |
| |
| sin.sin_family = AF_INET; |
| sin.sin_addr.s_addr = iph->daddr; |
| sin.sin_port = ports[1]; |
| memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); |
| |
| put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); |
| } |
| |
| void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) |
| { |
| struct inet_sock *inet = inet_sk(skb->sk); |
| unsigned flags = inet->cmsg_flags; |
| |
| /* Ordered by supposed usage frequency */ |
| if (flags & 1) |
| ip_cmsg_recv_pktinfo(msg, skb); |
| if ((flags >>= 1) == 0) |
| return; |
| |
| if (flags & 1) |
| ip_cmsg_recv_ttl(msg, skb); |
| if ((flags >>= 1) == 0) |
| return; |
| |
| if (flags & 1) |
| ip_cmsg_recv_tos(msg, skb); |
| if ((flags >>= 1) == 0) |
| return; |
| |
| if (flags & 1) |
| ip_cmsg_recv_opts(msg, skb); |
| if ((flags >>= 1) == 0) |
| return; |
| |
| if (flags & 1) |
| ip_cmsg_recv_retopts(msg, skb); |
| if ((flags >>= 1) == 0) |
| return; |
| |
| if (flags & 1) |
| ip_cmsg_recv_security(msg, skb); |
| |
| if ((flags >>= 1) == 0) |
| return; |
| if (flags & 1) |
| ip_cmsg_recv_dstaddr(msg, skb); |
| |
| } |
| EXPORT_SYMBOL(ip_cmsg_recv); |
| |
| int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) |
| { |
| int err; |
| struct cmsghdr *cmsg; |
| |
| for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { |
| if (!CMSG_OK(msg, cmsg)) |
| return -EINVAL; |
| if (cmsg->cmsg_level != SOL_IP) |
| continue; |
| switch (cmsg->cmsg_type) { |
| case IP_RETOPTS: |
| err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); |
| err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), |
| err < 40 ? err : 40); |
| if (err) |
| return err; |
| break; |
| case IP_PKTINFO: |
| { |
| struct in_pktinfo *info; |
| if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) |
| return -EINVAL; |
| info = (struct in_pktinfo *)CMSG_DATA(cmsg); |
| ipc->oif = info->ipi_ifindex; |
| ipc->addr = info->ipi_spec_dst.s_addr; |
| break; |
| } |
| default: |
| return -EINVAL; |
| } |
| } |
| return 0; |
| } |
| |
| |
| /* Special input handler for packets caught by router alert option. |
| They are selected only by protocol field, and then processed likely |
| local ones; but only if someone wants them! Otherwise, router |
| not running rsvpd will kill RSVP. |
| |
| It is user level problem, what it will make with them. |
| I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), |
| but receiver should be enough clever f.e. to forward mtrace requests, |
| sent to multicast group to reach destination designated router. |
| */ |
| struct ip_ra_chain __rcu *ip_ra_chain; |
| static DEFINE_SPINLOCK(ip_ra_lock); |
| |
| |
| static void ip_ra_destroy_rcu(struct rcu_head *head) |
| { |
| struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); |
| |
| sock_put(ra->saved_sk); |
| kfree(ra); |
| } |
| |
| int ip_ra_control(struct sock *sk, unsigned char on, |
| void (*destructor)(struct sock *)) |
| { |
| struct ip_ra_chain *ra, *new_ra; |
| struct ip_ra_chain __rcu **rap; |
| |
| if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) |
| return -EINVAL; |
| |
| new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; |
| |
| spin_lock_bh(&ip_ra_lock); |
| for (rap = &ip_ra_chain; |
| (ra = rcu_dereference_protected(*rap, |
| lockdep_is_held(&ip_ra_lock))) != NULL; |
| rap = &ra->next) { |
| if (ra->sk == sk) { |
| if (on) { |
| spin_unlock_bh(&ip_ra_lock); |
| kfree(new_ra); |
| return -EADDRINUSE; |
| } |
| /* dont let ip_call_ra_chain() use sk again */ |
| ra->sk = NULL; |
| rcu_assign_pointer(*rap, ra->next); |
| spin_unlock_bh(&ip_ra_lock); |
| |
| if (ra->destructor) |
| ra->destructor(sk); |
| /* |
| * Delay sock_put(sk) and kfree(ra) after one rcu grace |
| * period. This guarantee ip_call_ra_chain() dont need |
| * to mess with socket refcounts. |
| */ |
| ra->saved_sk = sk; |
| call_rcu(&ra->rcu, ip_ra_destroy_rcu); |
| return 0; |
| } |
| } |
| if (new_ra == NULL) { |
| spin_unlock_bh(&ip_ra_lock); |
| return -ENOBUFS; |
| } |
| new_ra->sk = sk; |
| new_ra->destructor = destructor; |
| |
| new_ra->next = ra; |
| rcu_assign_pointer(*rap, new_ra); |
| sock_hold(sk); |
| spin_unlock_bh(&ip_ra_lock); |
| |
| return 0; |
| } |
| |
| void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
| __be16 port, u32 info, u8 *payload) |
| { |
| struct sock_exterr_skb *serr; |
| |
| skb = skb_clone(skb, GFP_ATOMIC); |
| if (!skb) |
| return; |
| |
| serr = SKB_EXT_ERR(skb); |
| serr->ee.ee_errno = err; |
| serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; |
| serr->ee.ee_type = icmp_hdr(skb)->type; |
| serr->ee.ee_code = icmp_hdr(skb)->code; |
| serr->ee.ee_pad = 0; |
| serr->ee.ee_info = info; |
| serr->ee.ee_data = 0; |
| serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - |
| skb_network_header(skb); |
| serr->port = port; |
| |
| if (skb_pull(skb, payload - skb->data) != NULL) { |
| skb_reset_transport_header(skb); |
| if (sock_queue_err_skb(sk, skb) == 0) |
| return; |
| } |
| kfree_skb(skb); |
| } |
| |
| void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| struct sock_exterr_skb *serr; |
| struct iphdr *iph; |
| struct sk_buff *skb; |
| |
| if (!inet->recverr) |
| return; |
| |
| skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); |
| if (!skb) |
| return; |
| |
| skb_put(skb, sizeof(struct iphdr)); |
| skb_reset_network_header(skb); |
| iph = ip_hdr(skb); |
| iph->daddr = daddr; |
| |
| serr = SKB_EXT_ERR(skb); |
| serr->ee.ee_errno = err; |
| serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; |
| serr->ee.ee_type = 0; |
| serr->ee.ee_code = 0; |
| serr->ee.ee_pad = 0; |
| serr->ee.ee_info = info; |
| serr->ee.ee_data = 0; |
| serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
| serr->port = port; |
| |
| __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
| skb_reset_transport_header(skb); |
| |
| if (sock_queue_err_skb(sk, skb)) |
| kfree_skb(skb); |
| } |
| |
| /* |
| * Handle MSG_ERRQUEUE |
| */ |
| int ip_recv_error(struct sock *sk, struct msghdr *msg, int len) |
| { |
| struct sock_exterr_skb *serr; |
| struct sk_buff *skb, *skb2; |
| struct sockaddr_in *sin; |
| struct { |
| struct sock_extended_err ee; |
| struct sockaddr_in offender; |
| } errhdr; |
| int err; |
| int copied; |
| |
| err = -EAGAIN; |
| skb = skb_dequeue(&sk->sk_error_queue); |
| if (skb == NULL) |
| goto out; |
| |
| copied = skb->len; |
| if (copied > len) { |
| msg->msg_flags |= MSG_TRUNC; |
| copied = len; |
| } |
| err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| if (err) |
| goto out_free_skb; |
| |
| sock_recv_timestamp(msg, sk, skb); |
| |
| serr = SKB_EXT_ERR(skb); |
| |
| sin = (struct sockaddr_in *)msg->msg_name; |
| if (sin) { |
| sin->sin_family = AF_INET; |
| sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + |
| serr->addr_offset); |
| sin->sin_port = serr->port; |
| memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); |
| } |
| |
| memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); |
| sin = &errhdr.offender; |
| sin->sin_family = AF_UNSPEC; |
| if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { |
| struct inet_sock *inet = inet_sk(sk); |
| |
| sin->sin_family = AF_INET; |
| sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
| sin->sin_port = 0; |
| memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); |
| if (inet->cmsg_flags) |
| ip_cmsg_recv(msg, skb); |
| } |
| |
| put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); |
| |
| /* Now we could try to dump offended packet options */ |
| |
| msg->msg_flags |= MSG_ERRQUEUE; |
| err = copied; |
| |
| /* Reset and regenerate socket error */ |
| spin_lock_bh(&sk->sk_error_queue.lock); |
| sk->sk_err = 0; |
| skb2 = skb_peek(&sk->sk_error_queue); |
| if (skb2 != NULL) { |
| sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; |
| spin_unlock_bh(&sk->sk_error_queue.lock); |
| sk->sk_error_report(sk); |
| } else |
| spin_unlock_bh(&sk->sk_error_queue.lock); |
| |
| out_free_skb: |
| kfree_skb(skb); |
| out: |
| return err; |
| } |
| |
| |
| /* |
| * Socket option code for IP. This is the end of the line after any |
| * TCP,UDP etc options on an IP socket. |
| */ |
| |
| static int do_ip_setsockopt(struct sock *sk, int level, |
| int optname, char __user *optval, unsigned int optlen) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| int val = 0, err; |
| |
| if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | |
| (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | |
| (1<<IP_RETOPTS) | (1<<IP_TOS) | |
| (1<<IP_TTL) | (1<<IP_HDRINCL) | |
| (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | |
| (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) | |
| (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) | |
| (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) || |
| optname == IP_MULTICAST_TTL || |
| optname == IP_MULTICAST_ALL || |
| optname == IP_MULTICAST_LOOP || |
| optname == IP_RECVORIGDSTADDR) { |
| if (optlen >= sizeof(int)) { |
| if (get_user(val, (int __user *) optval)) |
| return -EFAULT; |
| } else if (optlen >= sizeof(char)) { |
| unsigned char ucval; |
| |
| if (get_user(ucval, (unsigned char __user *) optval)) |
| return -EFAULT; |
| val = (int) ucval; |
| } |
| } |
| |
| /* If optlen==0, it is equivalent to val == 0 */ |
| |
| if (ip_mroute_opt(optname)) |
| return ip_mroute_setsockopt(sk, optname, optval, optlen); |
| |
| err = 0; |
| lock_sock(sk); |
| |
| switch (optname) { |
| case IP_OPTIONS: |
| { |
| struct ip_options_rcu *old, *opt = NULL; |
| |
| if (optlen > 40) |
| goto e_inval; |
| err = ip_options_get_from_user(sock_net(sk), &opt, |
| optval, optlen); |
| if (err) |
| break; |
| old = rcu_dereference_protected(inet->inet_opt, |
| sock_owned_by_user(sk)); |
| if (inet->is_icsk) { |
| struct inet_connection_sock *icsk = inet_csk(sk); |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (sk->sk_family == PF_INET || |
| (!((1 << sk->sk_state) & |
| (TCPF_LISTEN | TCPF_CLOSE)) && |
| inet->inet_daddr != LOOPBACK4_IPV6)) { |
| #endif |
| if (old) |
| icsk->icsk_ext_hdr_len -= old->opt.optlen; |
| if (opt) |
| icsk->icsk_ext_hdr_len += opt->opt.optlen; |
| icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); |
| #if IS_ENABLED(CONFIG_IPV6) |
| } |
| #endif |
| } |
| rcu_assign_pointer(inet->inet_opt, opt); |
| if (old) |
| kfree_rcu(old, rcu); |
| break; |
| } |
| case IP_PKTINFO: |
| if (val) |
| inet->cmsg_flags |= IP_CMSG_PKTINFO; |
| else |
| inet->cmsg_flags &= ~IP_CMSG_PKTINFO; |
| break; |
| case IP_RECVTTL: |
| if (val) |
| inet->cmsg_flags |= IP_CMSG_TTL; |
| else |
| inet->cmsg_flags &= ~IP_CMSG_TTL; |
| break; |
| case IP_RECVTOS: |
| if (val) |
| inet->cmsg_flags |= IP_CMSG_TOS; |
| else |
| inet->cmsg_flags &= ~IP_CMSG_TOS; |
| break; |
| case IP_RECVOPTS: |
| if (val) |
| inet->cmsg_flags |= IP_CMSG_RECVOPTS; |
| else |
| inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; |
| break; |
| case IP_RETOPTS: |
| if (val) |
| inet->cmsg_flags |= IP_CMSG_RETOPTS; |
| else |
| inet->cmsg_flags &= ~IP_CMSG_RETOPTS; |
| break; |
| case IP_PASSSEC: |
| if (val) |
| inet->cmsg_flags |= IP_CMSG_PASSSEC; |
| else |
| inet->cmsg_flags &= ~IP_CMSG_PASSSEC; |
| break; |
| case IP_RECVORIGDSTADDR: |
| if (val) |
| inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; |
| else |
| inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; |
| break; |
| case IP_TOS: /* This sets both TOS and Precedence */ |
| if (sk->sk_type == SOCK_STREAM) { |
| val &= ~INET_ECN_MASK; |
| val |= inet->tos & INET_ECN_MASK; |
| } |
| if (inet->tos != val) { |
| inet->tos = val; |
| sk->sk_priority = rt_tos2priority(val); |
| sk_dst_reset(sk); |
| } |
| break; |
| case IP_TTL: |
| if (optlen < 1) |
| goto e_inval; |
| if (val != -1 && (val < 0 || val > 255)) |
| goto e_inval; |
| inet->uc_ttl = val; |
| break; |
| case IP_HDRINCL: |
| if (sk->sk_type != SOCK_RAW) { |
| err = -ENOPROTOOPT; |
| break; |
| } |
| inet->hdrincl = val ? 1 : 0; |
| break; |
| case IP_NODEFRAG: |
| if (sk->sk_type != SOCK_RAW) { |
| err = -ENOPROTOOPT; |
| break; |
| } |
| inet->nodefrag = val ? 1 : 0; |
| break; |
| case IP_MTU_DISCOVER: |
| if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE) |
| goto e_inval; |
| inet->pmtudisc = val; |
| break; |
| case IP_RECVERR: |
| inet->recverr = !!val; |
| if (!val) |
| skb_queue_purge(&sk->sk_error_queue); |
| break; |
| case IP_MULTICAST_TTL: |
| if (sk->sk_type == SOCK_STREAM) |
| goto e_inval; |
| if (optlen < 1) |
| goto e_inval; |
| if (val == -1) |
| val = 1; |
| if (val < 0 || val > 255) |
| goto e_inval; |
| inet->mc_ttl = val; |
| break; |
| case IP_MULTICAST_LOOP: |
| if (optlen < 1) |
| goto e_inval; |
| inet->mc_loop = !!val; |
| break; |
| case IP_MULTICAST_IF: |
| { |
| struct ip_mreqn mreq; |
| struct net_device *dev = NULL; |
| |
| if (sk->sk_type == SOCK_STREAM) |
| goto e_inval; |
| /* |
| * Check the arguments are allowable |
| */ |
| |
| if (optlen < sizeof(struct in_addr)) |
| goto e_inval; |
| |
| err = -EFAULT; |
| if (optlen >= sizeof(struct ip_mreqn)) { |
| if (copy_from_user(&mreq, optval, sizeof(mreq))) |
| break; |
| } else { |
| memset(&mreq, 0, sizeof(mreq)); |
| if (optlen >= sizeof(struct in_addr) && |
| copy_from_user(&mreq.imr_address, optval, |
| sizeof(struct in_addr))) |
| break; |
| } |
| |
| if (!mreq.imr_ifindex) { |
| if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { |
| inet->mc_index = 0; |
| inet->mc_addr = 0; |
| err = 0; |
| break; |
| } |
| dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); |
| if (dev) |
| mreq.imr_ifindex = dev->ifindex; |
| } else |
| dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); |
| |
| |
| err = -EADDRNOTAVAIL; |
| if (!dev) |
| break; |
| dev_put(dev); |
| |
| err = -EINVAL; |
| if (sk->sk_bound_dev_if && |
| mreq.imr_ifindex != sk->sk_bound_dev_if) |
| break; |
| |
| inet->mc_index = mreq.imr_ifindex; |
| inet->mc_addr = mreq.imr_address.s_addr; |
| err = 0; |
| break; |
| } |
| |
| case IP_ADD_MEMBERSHIP: |
| case IP_DROP_MEMBERSHIP: |
| { |
| struct ip_mreqn mreq; |
| |
| err = -EPROTO; |
| if (inet_sk(sk)->is_icsk) |
| break; |
| |
| if (optlen < sizeof(struct ip_mreq)) |
| goto e_inval; |
| err = -EFAULT; |
| if (optlen >= sizeof(struct ip_mreqn)) { |
| if (copy_from_user(&mreq, optval, sizeof(mreq))) |
| break; |
| } else { |
| memset(&mreq, 0, sizeof(mreq)); |
| if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) |
| break; |
| } |
| |
| if (optname == IP_ADD_MEMBERSHIP) |
| err = ip_mc_join_group(sk, &mreq); |
| else |
| err = ip_mc_leave_group(sk, &mreq); |
| break; |
| } |
| case IP_MSFILTER: |
| { |
| struct ip_msfilter *msf; |
| |
| if (optlen < IP_MSFILTER_SIZE(0)) |
| goto e_inval; |
| if (optlen > sysctl_optmem_max) { |
| err = -ENOBUFS; |
| break; |
| } |
| msf = kmalloc(optlen, GFP_KERNEL); |
| if (!msf) { |
| err = -ENOBUFS; |
| break; |
| } |
| err = -EFAULT; |
| if (copy_from_user(msf, optval, optlen)) { |
| kfree(msf); |
| break; |
| } |
| /* numsrc >= (1G-4) overflow in 32 bits */ |
| if (msf->imsf_numsrc >= 0x3ffffffcU || |
| msf->imsf_numsrc > sysctl_igmp_max_msf) { |
| kfree(msf); |
| err = -ENOBUFS; |
| break; |
| } |
| if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { |
| kfree(msf); |
| err = -EINVAL; |
| break; |
| } |
| err = ip_mc_msfilter(sk, msf, 0); |
| kfree(msf); |
| break; |
| } |
| case IP_BLOCK_SOURCE: |
| case IP_UNBLOCK_SOURCE: |
| case IP_ADD_SOURCE_MEMBERSHIP: |
| case IP_DROP_SOURCE_MEMBERSHIP: |
| { |
| struct ip_mreq_source mreqs; |
| int omode, add; |
| |
| if (optlen != sizeof(struct ip_mreq_source)) |
| goto e_inval; |
| if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { |
| err = -EFAULT; |
| break; |
| } |
| if (optname == IP_BLOCK_SOURCE) { |
| omode = MCAST_EXCLUDE; |
| add = 1; |
| } else if (optname == IP_UNBLOCK_SOURCE) { |
| omode = MCAST_EXCLUDE; |
| add = 0; |
| } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { |
| struct ip_mreqn mreq; |
| |
| mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; |
| mreq.imr_address.s_addr = mreqs.imr_interface; |
| mreq.imr_ifindex = 0; |
| err = ip_mc_join_group(sk, &mreq); |
| if (err && err != -EADDRINUSE) |
| break; |
| omode = MCAST_INCLUDE; |
| add = 1; |
| } else /* IP_DROP_SOURCE_MEMBERSHIP */ { |
| omode = MCAST_INCLUDE; |
| add = 0; |
| } |
| err = ip_mc_source(add, omode, sk, &mreqs, 0); |
| break; |
| } |
| case MCAST_JOIN_GROUP: |
| case MCAST_LEAVE_GROUP: |
| { |
| struct group_req greq; |
| struct sockaddr_in *psin; |
| struct ip_mreqn mreq; |
| |
| if (optlen < sizeof(struct group_req)) |
| goto e_inval; |
| err = -EFAULT; |
| if (copy_from_user(&greq, optval, sizeof(greq))) |
| break; |
| psin = (struct sockaddr_in *)&greq.gr_group; |
| if (psin->sin_family != AF_INET) |
| goto e_inval; |
| memset(&mreq, 0, sizeof(mreq)); |
| mreq.imr_multiaddr = psin->sin_addr; |
| mreq.imr_ifindex = greq.gr_interface; |
| |
| if (optname == MCAST_JOIN_GROUP) |
| err = ip_mc_join_group(sk, &mreq); |
| else |
| err = ip_mc_leave_group(sk, &mreq); |
| break; |
| } |
| case MCAST_JOIN_SOURCE_GROUP: |
| case MCAST_LEAVE_SOURCE_GROUP: |
| case MCAST_BLOCK_SOURCE: |
| case MCAST_UNBLOCK_SOURCE: |
| { |
| struct group_source_req greqs; |
| struct ip_mreq_source mreqs; |
| struct sockaddr_in *psin; |
| int omode, add; |
| |
| if (optlen != sizeof(struct group_source_req)) |
| goto e_inval; |
| if (copy_from_user(&greqs, optval, sizeof(greqs))) { |
| err = -EFAULT; |
| break; |
| } |
| if (greqs.gsr_group.ss_family != AF_INET || |
| greqs.gsr_source.ss_family != AF_INET) { |
| err = -EADDRNOTAVAIL; |
| break; |
| } |
| psin = (struct sockaddr_in *)&greqs.gsr_group; |
| mreqs.imr_multiaddr = psin->sin_addr.s_addr; |
| psin = (struct sockaddr_in *)&greqs.gsr_source; |
| mreqs.imr_sourceaddr = psin->sin_addr.s_addr; |
| mreqs.imr_interface = 0; /* use index for mc_source */ |
| |
| 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 ip_mreqn mreq; |
| |
| psin = (struct sockaddr_in *)&greqs.gsr_group; |
| mreq.imr_multiaddr = psin->sin_addr; |
| mreq.imr_address.s_addr = 0; |
| mreq.imr_ifindex = greqs.gsr_interface; |
| err = ip_mc_join_group(sk, &mreq); |
| if (err && err != -EADDRINUSE) |
| break; |
| greqs.gsr_interface = mreq.imr_ifindex; |
| omode = MCAST_INCLUDE; |
| add = 1; |
| } else /* MCAST_LEAVE_SOURCE_GROUP */ { |
| omode = MCAST_INCLUDE; |
| add = 0; |
| } |
| err = ip_mc_source(add, omode, sk, &mreqs, |
| greqs.gsr_interface); |
| break; |
| } |
| case MCAST_MSFILTER: |
| { |
| struct sockaddr_in *psin; |
| struct ip_msfilter *msf = NULL; |
| struct group_filter *gsf = NULL; |
| int msize, i, ifindex; |
| |
| if (optlen < GROUP_FILTER_SIZE(0)) |
| goto e_inval; |
| if (optlen > sysctl_optmem_max) { |
| err = -ENOBUFS; |
| break; |
| } |
| gsf = kmalloc(optlen, GFP_KERNEL); |
| if (!gsf) { |
| err = -ENOBUFS; |
| break; |
| } |
| err = -EFAULT; |
| if (copy_from_user(gsf, optval, optlen)) |
| goto mc_msf_out; |
| |
| /* numsrc >= (4G-140)/128 overflow in 32 bits */ |
| if (gsf->gf_numsrc >= 0x1ffffff || |
| gsf->gf_numsrc > sysctl_igmp_max_msf) { |
| err = -ENOBUFS; |
| goto mc_msf_out; |
| } |
| if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { |
| err = -EINVAL; |
| goto mc_msf_out; |
| } |
| msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); |
| msf = kmalloc(msize, GFP_KERNEL); |
| if (!msf) { |
| err = -ENOBUFS; |
| goto mc_msf_out; |
| } |
| ifindex = gsf->gf_interface; |
| psin = (struct sockaddr_in *)&gsf->gf_group; |
| if (psin->sin_family != AF_INET) { |
| err = -EADDRNOTAVAIL; |
| goto mc_msf_out; |
| } |
| msf->imsf_multiaddr = psin->sin_addr.s_addr; |
| msf->imsf_interface = 0; |
| msf->imsf_fmode = gsf->gf_fmode; |
| msf->imsf_numsrc = gsf->gf_numsrc; |
| err = -EADDRNOTAVAIL; |
| for (i = 0; i < gsf->gf_numsrc; ++i) { |
| psin = (struct sockaddr_in *)&gsf->gf_slist[i]; |
| |
| if (psin->sin_family != AF_INET) |
| goto mc_msf_out; |
| msf->imsf_slist[i] = psin->sin_addr.s_addr; |
| } |
| kfree(gsf); |
| gsf = NULL; |
| |
| err = ip_mc_msfilter(sk, msf, ifindex); |
| mc_msf_out: |
| kfree(msf); |
| kfree(gsf); |
| break; |
| } |
| case IP_MULTICAST_ALL: |
| if (optlen < 1) |
| goto e_inval; |
| if (val != 0 && val != 1) |
| goto e_inval; |
| inet->mc_all = val; |
| break; |
| case IP_ROUTER_ALERT: |
| err = ip_ra_control(sk, val ? 1 : 0, NULL); |
| break; |
| |
| case IP_FREEBIND: |
| if (optlen < 1) |
| goto e_inval; |
| inet->freebind = !!val; |
| break; |
| |
| case IP_IPSEC_POLICY: |
| case IP_XFRM_POLICY: |
| err = -EPERM; |
| if (!capable(CAP_NET_ADMIN)) |
| break; |
| err = xfrm_user_policy(sk, optname, optval, optlen); |
| break; |
| |
| case IP_TRANSPARENT: |
| if (!!val && !capable(CAP_NET_RAW) && !capable(CAP_NET_ADMIN)) { |
| err = -EPERM; |
| break; |
| } |
| if (optlen < 1) |
| goto e_inval; |
| inet->transparent = !!val; |
| break; |
| |
| case IP_MINTTL: |
| if (optlen < 1) |
| goto e_inval; |
| if (val < 0 || val > 255) |
| goto e_inval; |
| inet->min_ttl = val; |
| break; |
| |
| default: |
| err = -ENOPROTOOPT; |
| break; |
| } |
| release_sock(sk); |
| return err; |
| |
| e_inval: |
| release_sock(sk); |
| return -EINVAL; |
| } |
| |
| /** |
| * ipv4_pktinfo_prepare - transfert some info from rtable to skb |
| * @sk: socket |
| * @skb: buffer |
| * |
| * To support IP_CMSG_PKTINFO option, we store rt_iif and rt_spec_dst |
| * in skb->cb[] before dst drop. |
| * This way, receiver doesnt make cache line misses to read rtable. |
| */ |
| void ipv4_pktinfo_prepare(struct sk_buff *skb) |
| { |
| struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); |
| const struct rtable *rt = skb_rtable(skb); |
| |
| if (rt) { |
| pktinfo->ipi_ifindex = rt->rt_iif; |
| pktinfo->ipi_spec_dst.s_addr = rt->rt_spec_dst; |
| } else { |
| pktinfo->ipi_ifindex = 0; |
| pktinfo->ipi_spec_dst.s_addr = 0; |
| } |
| skb_dst_drop(skb); |
| } |
| |
| int ip_setsockopt(struct sock *sk, int level, |
| int optname, char __user *optval, unsigned int optlen) |
| { |
| int err; |
| |
| if (level != SOL_IP) |
| return -ENOPROTOOPT; |
| |
| err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
| #ifdef CONFIG_NETFILTER |
| /* we need to exclude all possible ENOPROTOOPTs except default case */ |
| if (err == -ENOPROTOOPT && optname != IP_HDRINCL && |
| optname != IP_IPSEC_POLICY && |
| optname != IP_XFRM_POLICY && |
| !ip_mroute_opt(optname)) { |
| lock_sock(sk); |
| err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); |
| release_sock(sk); |
| } |
| #endif |
| return err; |
| } |
| EXPORT_SYMBOL(ip_setsockopt); |
| |
| #ifdef CONFIG_COMPAT |
| int compat_ip_setsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, unsigned int optlen) |
| { |
| int err; |
| |
| if (level != SOL_IP) |
| return -ENOPROTOOPT; |
| |
| if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) |
| return compat_mc_setsockopt(sk, level, optname, optval, optlen, |
| ip_setsockopt); |
| |
| err = do_ip_setsockopt(sk, level, optname, optval, optlen); |
| #ifdef CONFIG_NETFILTER |
| /* we need to exclude all possible ENOPROTOOPTs except default case */ |
| if (err == -ENOPROTOOPT && optname != IP_HDRINCL && |
| optname != IP_IPSEC_POLICY && |
| optname != IP_XFRM_POLICY && |
| !ip_mroute_opt(optname)) { |
| lock_sock(sk); |
| err = compat_nf_setsockopt(sk, PF_INET, optname, |
| optval, optlen); |
| release_sock(sk); |
| } |
| #endif |
| return err; |
| } |
| EXPORT_SYMBOL(compat_ip_setsockopt); |
| #endif |
| |
| /* |
| * Get the options. Note for future reference. The GET of IP options gets |
| * the _received_ ones. The set sets the _sent_ ones. |
| */ |
| |
| static int do_ip_getsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, int __user *optlen, unsigned flags) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| int val; |
| int len; |
| |
| if (level != SOL_IP) |
| return -EOPNOTSUPP; |
| |
| if (ip_mroute_opt(optname)) |
| return ip_mroute_getsockopt(sk, optname, optval, optlen); |
| |
| if (get_user(len, optlen)) |
| return -EFAULT; |
| if (len < 0) |
| return -EINVAL; |
| |
| lock_sock(sk); |
| |
| switch (optname) { |
| case IP_OPTIONS: |
| { |
| unsigned char optbuf[sizeof(struct ip_options)+40]; |
| struct ip_options *opt = (struct ip_options *)optbuf; |
| struct ip_options_rcu *inet_opt; |
| |
| inet_opt = rcu_dereference_protected(inet->inet_opt, |
| sock_owned_by_user(sk)); |
| opt->optlen = 0; |
| if (inet_opt) |
| memcpy(optbuf, &inet_opt->opt, |
| sizeof(struct ip_options) + |
| inet_opt->opt.optlen); |
| release_sock(sk); |
| |
| if (opt->optlen == 0) |
| return put_user(0, optlen); |
| |
| ip_options_undo(opt); |
| |
| len = min_t(unsigned int, len, opt->optlen); |
| if (put_user(len, optlen)) |
| return -EFAULT; |
| if (copy_to_user(optval, opt->__data, len)) |
| return -EFAULT; |
| return 0; |
| } |
| case IP_PKTINFO: |
| val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; |
| break; |
| case IP_RECVTTL: |
| val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; |
| break; |
| case IP_RECVTOS: |
| val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; |
| break; |
| case IP_RECVOPTS: |
| val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; |
| break; |
| case IP_RETOPTS: |
| val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; |
| break; |
| case IP_PASSSEC: |
| val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; |
| break; |
| case IP_RECVORIGDSTADDR: |
| val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; |
| break; |
| case IP_TOS: |
| val = inet->tos; |
| break; |
| case IP_TTL: |
| val = (inet->uc_ttl == -1 ? |
| sysctl_ip_default_ttl : |
| inet->uc_ttl); |
| break; |
| case IP_HDRINCL: |
| val = inet->hdrincl; |
| break; |
| case IP_NODEFRAG: |
| val = inet->nodefrag; |
| break; |
| case IP_MTU_DISCOVER: |
| val = inet->pmtudisc; |
| break; |
| case IP_MTU: |
| { |
| struct dst_entry *dst; |
| val = 0; |
| dst = sk_dst_get(sk); |
| if (dst) { |
| val = dst_mtu(dst); |
| dst_release(dst); |
| } |
| if (!val) { |
| release_sock(sk); |
| return -ENOTCONN; |
| } |
| break; |
| } |
| case IP_RECVERR: |
| val = inet->recverr; |
| break; |
| case IP_MULTICAST_TTL: |
| val = inet->mc_ttl; |
| break; |
| case IP_MULTICAST_LOOP: |
| val = inet->mc_loop; |
| break; |
| case IP_MULTICAST_IF: |
| { |
| struct in_addr addr; |
| len = min_t(unsigned int, len, sizeof(struct in_addr)); |
| addr.s_addr = inet->mc_addr; |
| release_sock(sk); |
| |
| if (put_user(len, optlen)) |
| return -EFAULT; |
| if (copy_to_user(optval, &addr, len)) |
| return -EFAULT; |
| return 0; |
| } |
| case IP_MSFILTER: |
| { |
| struct ip_msfilter msf; |
| int err; |
| |
| if (len < IP_MSFILTER_SIZE(0)) { |
| release_sock(sk); |
| return -EINVAL; |
| } |
| if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { |
| release_sock(sk); |
| return -EFAULT; |
| } |
| err = ip_mc_msfget(sk, &msf, |
| (struct ip_msfilter __user *)optval, optlen); |
| release_sock(sk); |
| return err; |
| } |
| case MCAST_MSFILTER: |
| { |
| struct group_filter gsf; |
| int err; |
| |
| if (len < GROUP_FILTER_SIZE(0)) { |
| release_sock(sk); |
| return -EINVAL; |
| } |
| if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { |
| release_sock(sk); |
| return -EFAULT; |
| } |
| err = ip_mc_gsfget(sk, &gsf, |
| (struct group_filter __user *)optval, |
| optlen); |
| release_sock(sk); |
| return err; |
| } |
| case IP_MULTICAST_ALL: |
| val = inet->mc_all; |
| break; |
| case IP_PKTOPTIONS: |
| { |
| struct msghdr msg; |
| |
| release_sock(sk); |
| |
| if (sk->sk_type != SOCK_STREAM) |
| return -ENOPROTOOPT; |
| |
| msg.msg_control = optval; |
| msg.msg_controllen = len; |
| msg.msg_flags = flags; |
| |
| if (inet->cmsg_flags & IP_CMSG_PKTINFO) { |
| struct in_pktinfo info; |
| |
| info.ipi_addr.s_addr = inet->inet_rcv_saddr; |
| info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; |
| info.ipi_ifindex = inet->mc_index; |
| put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); |
| } |
| if (inet->cmsg_flags & IP_CMSG_TTL) { |
| int hlim = inet->mc_ttl; |
| put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); |
| } |
| len -= msg.msg_controllen; |
| return put_user(len, optlen); |
| } |
| case IP_FREEBIND: |
| val = inet->freebind; |
| break; |
| case IP_TRANSPARENT: |
| val = inet->transparent; |
| break; |
| case IP_MINTTL: |
| val = inet->min_ttl; |
| break; |
| default: |
| release_sock(sk); |
| return -ENOPROTOOPT; |
| } |
| release_sock(sk); |
| |
| if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { |
| unsigned char ucval = (unsigned char)val; |
| len = 1; |
| if (put_user(len, optlen)) |
| return -EFAULT; |
| if (copy_to_user(optval, &ucval, 1)) |
| return -EFAULT; |
| } else { |
| 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; |
| } |
| |
| int ip_getsockopt(struct sock *sk, int level, |
| int optname, char __user *optval, int __user *optlen) |
| { |
| int err; |
| |
| err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); |
| #ifdef CONFIG_NETFILTER |
| /* we need to exclude all possible ENOPROTOOPTs except default case */ |
| if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
| !ip_mroute_opt(optname)) { |
| int len; |
| |
| if (get_user(len, optlen)) |
| return -EFAULT; |
| |
| lock_sock(sk); |
| err = nf_getsockopt(sk, PF_INET, optname, optval, |
| &len); |
| release_sock(sk); |
| if (err >= 0) |
| err = put_user(len, optlen); |
| return err; |
| } |
| #endif |
| return err; |
| } |
| EXPORT_SYMBOL(ip_getsockopt); |
| |
| #ifdef CONFIG_COMPAT |
| int compat_ip_getsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| int err; |
| |
| if (optname == MCAST_MSFILTER) |
| return compat_mc_getsockopt(sk, level, optname, optval, optlen, |
| ip_getsockopt); |
| |
| err = do_ip_getsockopt(sk, level, optname, optval, optlen, |
| MSG_CMSG_COMPAT); |
| |
| #ifdef CONFIG_NETFILTER |
| /* we need to exclude all possible ENOPROTOOPTs except default case */ |
| if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && |
| !ip_mroute_opt(optname)) { |
| int len; |
| |
| if (get_user(len, optlen)) |
| return -EFAULT; |
| |
| lock_sock(sk); |
| err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); |
| release_sock(sk); |
| if (err >= 0) |
| err = put_user(len, optlen); |
| return err; |
| } |
| #endif |
| return err; |
| } |
| EXPORT_SYMBOL(compat_ip_getsockopt); |
| #endif |