/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if IS_ENABLED(CONFIG_IPV6) #include #endif #include #include #include /* * SOL_IP control messages. */ 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_checksum(struct msghdr *msg, struct sk_buff *skb, int offset) { __wsum csum = skb->csum; if (skb->ip_summed != CHECKSUM_COMPLETE) return; if (offset != 0) csum = csum_sub(csum, csum_partial(skb->data, offset, 0)); put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); } 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_offset(struct msghdr *msg, struct sk_buff *skb, int offset) { struct inet_sock *inet = inet_sk(skb->sk); unsigned int flags = inet->cmsg_flags; /* Ordered by supposed usage frequency */ if (flags & IP_CMSG_PKTINFO) { ip_cmsg_recv_pktinfo(msg, skb); flags &= ~IP_CMSG_PKTINFO; if (!flags) return; } if (flags & IP_CMSG_TTL) { ip_cmsg_recv_ttl(msg, skb); flags &= ~IP_CMSG_TTL; if (!flags) return; } if (flags & IP_CMSG_TOS) { ip_cmsg_recv_tos(msg, skb); flags &= ~IP_CMSG_TOS; if (!flags) return; } if (flags & IP_CMSG_RECVOPTS) { ip_cmsg_recv_opts(msg, skb); flags &= ~IP_CMSG_RECVOPTS; if (!flags) return; } if (flags & IP_CMSG_RETOPTS) { ip_cmsg_recv_retopts(msg, skb); flags &= ~IP_CMSG_RETOPTS; if (!flags) return; } if (flags & IP_CMSG_PASSSEC) { ip_cmsg_recv_security(msg, skb); flags &= ~IP_CMSG_PASSSEC; if (!flags) return; } if (flags & IP_CMSG_ORIGDSTADDR) { ip_cmsg_recv_dstaddr(msg, skb); flags &= ~IP_CMSG_ORIGDSTADDR; if (!flags) return; } if (flags & IP_CMSG_CHECKSUM) ip_cmsg_recv_checksum(msg, skb, offset); } EXPORT_SYMBOL(ip_cmsg_recv_offset); int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc, bool allow_ipv6) { int err, val; struct cmsghdr *cmsg; for_each_cmsghdr(cmsg, msg) { if (!CMSG_OK(msg, cmsg)) return -EINVAL; #if IS_ENABLED(CONFIG_IPV6) if (allow_ipv6 && cmsg->cmsg_level == SOL_IPV6 && cmsg->cmsg_type == IPV6_PKTINFO) { struct in6_pktinfo *src_info; if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) return -EINVAL; src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) return -EINVAL; if (src_info->ipi6_ifindex) ipc->oif = src_info->ipi6_ifindex; ipc->addr = src_info->ipi6_addr.s6_addr32[3]; continue; } #endif if (cmsg->cmsg_level != SOL_IP) continue; switch (cmsg->cmsg_type) { case IP_RETOPTS: err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); /* Our caller is responsible for freeing ipc->opt */ 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); if (info->ipi_ifindex) ipc->oif = info->ipi_ifindex; ipc->addr = info->ipi_spec_dst.s_addr; break; } case IP_TTL: if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) return -EINVAL; val = *(int *)CMSG_DATA(cmsg); if (val < 1 || val > 255) return -EINVAL; ipc->ttl = val; break; case IP_TOS: if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) return -EINVAL; val = *(int *)CMSG_DATA(cmsg); if (val < 0 || val > 255) return -EINVAL; ipc->tos = val; ipc->priority = rt_tos2priority(ipc->tos); 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_INIT_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) { spin_unlock_bh(&ip_ra_lock); return -ENOBUFS; } new_ra->sk = sk; new_ra->destructor = destructor; RCU_INIT_POINTER(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)) { 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); } /* For some errors we have valid addr_offset even with zero payload and * zero port. Also, addr_offset should be supported if port is set. */ static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) { return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; } /* IPv4 supports cmsg on all imcp errors and some timestamps * * Timestamp code paths do not initialize the fields expected by cmsg: * the PKTINFO fields in skb->cb[]. Fill those in here. */ static bool ipv4_datagram_support_cmsg(const struct sock *sk, struct sk_buff *skb, int ee_origin) { struct in_pktinfo *info; if (ee_origin == SO_EE_ORIGIN_ICMP) return true; if (ee_origin == SO_EE_ORIGIN_LOCAL) return false; /* Support IP_PKTINFO on tstamp packets if requested, to correlate * timestamp with egress dev. Not possible for packets without dev * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). */ if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || (!skb->dev)) return false; info = PKTINFO_SKB_CB(skb); info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; info->ipi_ifindex = skb->dev->ifindex; return true; } /* * Handle MSG_ERRQUEUE */ int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) { struct sock_exterr_skb *serr; struct sk_buff *skb; DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); struct { struct sock_extended_err ee; struct sockaddr_in offender; } errhdr; int err; int copied; WARN_ON_ONCE(sk->sk_family == AF_INET6); err = -EAGAIN; skb = sock_dequeue_err_skb(sk); if (!skb) goto out; copied = skb->len; if (copied > len) { msg->msg_flags |= MSG_TRUNC; copied = len; } err = skb_copy_datagram_msg(skb, 0, msg, copied); if (err) goto out_free_skb; sock_recv_timestamp(msg, sk, skb); serr = SKB_EXT_ERR(skb); if (sin && ipv4_datagram_support_addr(serr)) { 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)); *addr_len = sizeof(*sin); } memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); sin = &errhdr.offender; memset(sin, 0, sizeof(*sin)); if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { sin->sin_family = AF_INET; sin->sin_addr.s_addr = ip_hdr(skb)->saddr; if (inet_sk(sk)->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; 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 bool setsockopt_needs_rtnl(int optname) { switch (optname) { case IP_ADD_MEMBERSHIP: case IP_ADD_SOURCE_MEMBERSHIP: case IP_BLOCK_SOURCE: case IP_DROP_MEMBERSHIP: case IP_DROP_SOURCE_MEMBERSHIP: case IP_MSFILTER: case IP_UNBLOCK_SOURCE: case MCAST_BLOCK_SOURCE: case MCAST_MSFILTER: case MCAST_JOIN_GROUP: case MCAST_JOIN_SOURCE_GROUP: case MCAST_LEAVE_GROUP: case MCAST_LEAVE_SOURCE_GROUP: case MCAST_UNBLOCK_SOURCE: return true; } return false; } 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; bool needs_rtnl = setsockopt_needs_rtnl(optname); switch (optname) { case IP_PKTINFO: case IP_RECVTTL: case IP_RECVOPTS: case IP_RECVTOS: case IP_RETOPTS: case IP_TOS: case IP_TTL: case IP_HDRINCL: case IP_MTU_DISCOVER: case IP_RECVERR: case IP_ROUTER_ALERT: case IP_FREEBIND: case IP_PASSSEC: case IP_TRANSPARENT: case IP_MINTTL: case IP_NODEFRAG: case IP_UNICAST_IF: case IP_MULTICAST_TTL: case IP_MULTICAST_ALL: case IP_MULTICAST_LOOP: case IP_RECVORIGDSTADDR: case IP_CHECKSUM: 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; if (needs_rtnl) rtnl_lock(); 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_CHECKSUM: if (val) { if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { inet_inc_convert_csum(sk); inet->cmsg_flags |= IP_CMSG_CHECKSUM; } } else { if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { inet_dec_convert_csum(sk); inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; } } 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 < 1 || 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_OMIT) 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_UNICAST_IF: { struct net_device *dev = NULL; int ifindex; if (optlen != sizeof(int)) goto e_inval; ifindex = (__force int)ntohl((__force __be32)val); if (ifindex == 0) { inet->uc_index = 0; err = 0; break; } dev = dev_get_by_index(sock_net(sk), ifindex); err = -EADDRNOTAVAIL; if (!dev) break; dev_put(dev); err = -EINVAL; if (sk->sk_bound_dev_if) break; inet->uc_index = ifindex; err = 0; 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 ip_mreq)) { if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) break; } else if (optlen >= sizeof(struct in_addr)) { if (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 (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) break; err = xfrm_user_policy(sk, optname, optval, optlen); break; case IP_TRANSPARENT: if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && !ns_capable(sock_net(sk)->user_ns, 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); if (needs_rtnl) rtnl_unlock(); return err; e_inval: release_sock(sk); if (needs_rtnl) rtnl_unlock(); return -EINVAL; } /** * ipv4_pktinfo_prepare - transfer some info from rtable to skb * @sk: socket * @skb: buffer * * To support IP_CMSG_PKTINFO option, we store rt_iif and specific * destination in skb->cb[] before dst drop. * This way, receiver doesn't make cache line misses to read rtable. */ void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) { struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || ipv6_sk_rxinfo(sk); if (prepare && skb_rtable(skb)) { pktinfo->ipi_ifindex = inet_iif(skb); pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); } 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)) err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); #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)) err = compat_nf_setsockopt(sk, PF_INET, optname, optval, optlen); #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 int 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_CHECKSUM: val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 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_UNICAST_IF: val = (__force int)htonl((__u32) inet->uc_index); 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 = (__force void *) 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); } if (inet->cmsg_flags & IP_CMSG_TOS) { int tos = inet->rcv_tos; put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); } 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; err = nf_getsockopt(sk, PF_INET, optname, optval, &len); 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; err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); if (err >= 0) err = put_user(len, optlen); return err; } #endif return err; } EXPORT_SYMBOL(compat_ip_getsockopt); #endif