From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?= Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- net/ipv6/datagram.c | 971 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 971 insertions(+) create mode 100644 net/ipv6/datagram.c (limited to 'net/ipv6/datagram.c') diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c new file mode 100644 index 000000000..62d908e64 --- /dev/null +++ b/net/ipv6/datagram.c @@ -0,0 +1,971 @@ +/* + * common UDP/RAW code + * Linux INET6 implementation + * + * Authors: + * Pedro Roque + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +static bool ipv6_mapped_addr_any(const struct in6_addr *a) +{ + return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); +} + +int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) +{ + struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; + struct inet_sock *inet = inet_sk(sk); + struct ipv6_pinfo *np = inet6_sk(sk); + struct in6_addr *daddr, *final_p, final; + struct dst_entry *dst; + struct flowi6 fl6; + struct ip6_flowlabel *flowlabel = NULL; + struct ipv6_txoptions *opt; + int addr_type; + int err; + + if (usin->sin6_family == AF_INET) { + if (__ipv6_only_sock(sk)) + return -EAFNOSUPPORT; + err = ip4_datagram_connect(sk, uaddr, addr_len); + goto ipv4_connected; + } + + if (addr_len < SIN6_LEN_RFC2133) + return -EINVAL; + + if (usin->sin6_family != AF_INET6) + return -EAFNOSUPPORT; + + memset(&fl6, 0, sizeof(fl6)); + if (np->sndflow) { + fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; + if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { + flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); + if (!flowlabel) + return -EINVAL; + } + } + + addr_type = ipv6_addr_type(&usin->sin6_addr); + + if (addr_type == IPV6_ADDR_ANY) { + /* + * connect to self + */ + usin->sin6_addr.s6_addr[15] = 0x01; + } + + daddr = &usin->sin6_addr; + + if (addr_type == IPV6_ADDR_MAPPED) { + struct sockaddr_in sin; + + if (__ipv6_only_sock(sk)) { + err = -ENETUNREACH; + goto out; + } + sin.sin_family = AF_INET; + sin.sin_addr.s_addr = daddr->s6_addr32[3]; + sin.sin_port = usin->sin6_port; + + err = ip4_datagram_connect(sk, + (struct sockaddr *) &sin, + sizeof(sin)); + +ipv4_connected: + if (err) + goto out; + + ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); + + if (ipv6_addr_any(&np->saddr) || + ipv6_mapped_addr_any(&np->saddr)) + ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); + + if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || + ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { + ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, + &sk->sk_v6_rcv_saddr); + if (sk->sk_prot->rehash) + sk->sk_prot->rehash(sk); + } + + goto out; + } + + if (__ipv6_addr_needs_scope_id(addr_type)) { + if (addr_len >= sizeof(struct sockaddr_in6) && + usin->sin6_scope_id) { + if (sk->sk_bound_dev_if && + sk->sk_bound_dev_if != usin->sin6_scope_id) { + err = -EINVAL; + goto out; + } + sk->sk_bound_dev_if = usin->sin6_scope_id; + } + + if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) + sk->sk_bound_dev_if = np->mcast_oif; + + /* Connect to link-local address requires an interface */ + if (!sk->sk_bound_dev_if) { + err = -EINVAL; + goto out; + } + } + + sk->sk_v6_daddr = *daddr; + np->flow_label = fl6.flowlabel; + + inet->inet_dport = usin->sin6_port; + + /* + * Check for a route to destination an obtain the + * destination cache for it. + */ + + fl6.flowi6_proto = sk->sk_protocol; + fl6.daddr = sk->sk_v6_daddr; + fl6.saddr = np->saddr; + fl6.flowi6_oif = sk->sk_bound_dev_if; + fl6.flowi6_mark = sk->sk_mark; + fl6.fl6_dport = inet->inet_dport; + fl6.fl6_sport = inet->inet_sport; + + if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) + fl6.flowi6_oif = np->mcast_oif; + + security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); + + opt = flowlabel ? flowlabel->opt : np->opt; + final_p = fl6_update_dst(&fl6, opt, &final); + + dst = ip6_dst_lookup_flow(sk, &fl6, final_p); + err = 0; + if (IS_ERR(dst)) { + err = PTR_ERR(dst); + goto out; + } + + /* source address lookup done in ip6_dst_lookup */ + + if (ipv6_addr_any(&np->saddr)) + np->saddr = fl6.saddr; + + if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { + sk->sk_v6_rcv_saddr = fl6.saddr; + inet->inet_rcv_saddr = LOOPBACK4_IPV6; + if (sk->sk_prot->rehash) + sk->sk_prot->rehash(sk); + } + + ip6_dst_store(sk, dst, + ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? + &sk->sk_v6_daddr : NULL, +#ifdef CONFIG_IPV6_SUBTREES + ipv6_addr_equal(&fl6.saddr, &np->saddr) ? + &np->saddr : +#endif + NULL); + + sk->sk_state = TCP_ESTABLISHED; + ip6_set_txhash(sk); +out: + fl6_sock_release(flowlabel); + return err; +} +EXPORT_SYMBOL_GPL(ip6_datagram_connect); + +int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, + int addr_len) +{ + DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); + if (sin6->sin6_family != AF_INET6) + return -EAFNOSUPPORT; + return ip6_datagram_connect(sk, uaddr, addr_len); +} +EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); + +void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, + __be16 port, u32 info, u8 *payload) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + struct icmp6hdr *icmph = icmp6_hdr(skb); + struct sock_exterr_skb *serr; + + if (!np->recverr) + return; + + skb = skb_clone(skb, GFP_ATOMIC); + if (!skb) + return; + + skb->protocol = htons(ETH_P_IPV6); + + serr = SKB_EXT_ERR(skb); + serr->ee.ee_errno = err; + serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; + serr->ee.ee_type = icmph->icmp6_type; + serr->ee.ee_code = icmph->icmp6_code; + serr->ee.ee_pad = 0; + serr->ee.ee_info = info; + serr->ee.ee_data = 0; + serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - + skb_network_header(skb); + serr->port = port; + + __skb_pull(skb, payload - skb->data); + skb_reset_transport_header(skb); + + if (sock_queue_err_skb(sk, skb)) + kfree_skb(skb); +} + +void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + struct sock_exterr_skb *serr; + struct ipv6hdr *iph; + struct sk_buff *skb; + + if (!np->recverr) + return; + + skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); + if (!skb) + return; + + skb->protocol = htons(ETH_P_IPV6); + + skb_put(skb, sizeof(struct ipv6hdr)); + skb_reset_network_header(skb); + iph = ipv6_hdr(skb); + iph->daddr = fl6->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 = fl6->fl6_dport; + + __skb_pull(skb, skb_tail_pointer(skb) - skb->data); + skb_reset_transport_header(skb); + + if (sock_queue_err_skb(sk, skb)) + kfree_skb(skb); +} + +void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + struct ipv6hdr *iph; + struct sk_buff *skb; + struct ip6_mtuinfo *mtu_info; + + if (!np->rxopt.bits.rxpmtu) + return; + + skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); + if (!skb) + return; + + skb_put(skb, sizeof(struct ipv6hdr)); + skb_reset_network_header(skb); + iph = ipv6_hdr(skb); + iph->daddr = fl6->daddr; + + mtu_info = IP6CBMTU(skb); + + mtu_info->ip6m_mtu = mtu; + mtu_info->ip6m_addr.sin6_family = AF_INET6; + mtu_info->ip6m_addr.sin6_port = 0; + mtu_info->ip6m_addr.sin6_flowinfo = 0; + mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; + mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; + + __skb_pull(skb, skb_tail_pointer(skb) - skb->data); + skb_reset_transport_header(skb); + + skb = xchg(&np->rxpmtu, 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 ipv6_datagram_support_addr(struct sock_exterr_skb *serr) +{ + return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || + serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || + serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; +} + +/* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. + * + * At one point, excluding local errors was a quick test to identify icmp/icmp6 + * errors. This is no longer true, but the test remained, so the v6 stack, + * unlike v4, also honors cmsg requests on all wifi and timestamp errors. + * + * Timestamp code paths do not initialize the fields expected by cmsg: + * the PKTINFO fields in skb->cb[]. Fill those in here. + */ +static bool ip6_datagram_support_cmsg(struct sk_buff *skb, + struct sock_exterr_skb *serr) +{ + if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || + serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) + return true; + + if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) + return false; + + if (!skb->dev) + return false; + + if (skb->protocol == htons(ETH_P_IPV6)) + IP6CB(skb)->iif = skb->dev->ifindex; + else + PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex; + + return true; +} + +/* + * Handle MSG_ERRQUEUE + */ +int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + struct sock_exterr_skb *serr; + struct sk_buff *skb; + DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); + struct { + struct sock_extended_err ee; + struct sockaddr_in6 offender; + } errhdr; + int err; + int copied; + + 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 && ipv6_datagram_support_addr(serr)) { + const unsigned char *nh = skb_network_header(skb); + sin->sin6_family = AF_INET6; + sin->sin6_flowinfo = 0; + sin->sin6_port = serr->port; + if (skb->protocol == htons(ETH_P_IPV6)) { + const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), + struct ipv6hdr, daddr); + sin->sin6_addr = ip6h->daddr; + if (np->sndflow) + sin->sin6_flowinfo = ip6_flowinfo(ip6h); + sin->sin6_scope_id = + ipv6_iface_scope_id(&sin->sin6_addr, + IP6CB(skb)->iif); + } else { + ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), + &sin->sin6_addr); + sin->sin6_scope_id = 0; + } + *addr_len = sizeof(*sin); + } + + memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); + sin = &errhdr.offender; + memset(sin, 0, sizeof(*sin)); + + if (ip6_datagram_support_cmsg(skb, serr)) { + sin->sin6_family = AF_INET6; + if (np->rxopt.all) + ip6_datagram_recv_common_ctl(sk, msg, skb); + if (skb->protocol == htons(ETH_P_IPV6)) { + sin->sin6_addr = ipv6_hdr(skb)->saddr; + if (np->rxopt.all) + ip6_datagram_recv_specific_ctl(sk, msg, skb); + sin->sin6_scope_id = + ipv6_iface_scope_id(&sin->sin6_addr, + IP6CB(skb)->iif); + } else { + ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, + &sin->sin6_addr); + if (inet_sk(sk)->cmsg_flags) + ip_cmsg_recv(msg, skb); + } + } + + put_cmsg(msg, SOL_IPV6, IPV6_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; +} +EXPORT_SYMBOL_GPL(ipv6_recv_error); + +/* + * Handle IPV6_RECVPATHMTU + */ +int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, + int *addr_len) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + struct sk_buff *skb; + struct ip6_mtuinfo mtu_info; + DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); + int err; + int copied; + + err = -EAGAIN; + skb = xchg(&np->rxpmtu, NULL); + 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); + + memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); + + if (sin) { + sin->sin6_family = AF_INET6; + sin->sin6_flowinfo = 0; + sin->sin6_port = 0; + sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; + sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; + *addr_len = sizeof(*sin); + } + + put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); + + err = copied; + +out_free_skb: + kfree_skb(skb); +out: + return err; +} + + +void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, + struct sk_buff *skb) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); + + if (np->rxopt.bits.rxinfo) { + struct in6_pktinfo src_info; + + if (is_ipv6) { + src_info.ipi6_ifindex = IP6CB(skb)->iif; + src_info.ipi6_addr = ipv6_hdr(skb)->daddr; + } else { + src_info.ipi6_ifindex = + PKTINFO_SKB_CB(skb)->ipi_ifindex; + ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, + &src_info.ipi6_addr); + } + + if (src_info.ipi6_ifindex >= 0) + put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, + sizeof(src_info), &src_info); + } +} + +void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, + struct sk_buff *skb) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + struct inet6_skb_parm *opt = IP6CB(skb); + unsigned char *nh = skb_network_header(skb); + + if (np->rxopt.bits.rxhlim) { + int hlim = ipv6_hdr(skb)->hop_limit; + put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); + } + + if (np->rxopt.bits.rxtclass) { + int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); + put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); + } + + if (np->rxopt.bits.rxflow) { + __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); + if (flowinfo) + put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); + } + + /* HbH is allowed only once */ + if (np->rxopt.bits.hopopts && opt->hop) { + u8 *ptr = nh + opt->hop; + put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); + } + + if (opt->lastopt && + (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { + /* + * Silly enough, but we need to reparse in order to + * report extension headers (except for HbH) + * in order. + * + * Also note that IPV6_RECVRTHDRDSTOPTS is NOT + * (and WILL NOT be) defined because + * IPV6_RECVDSTOPTS is more generic. --yoshfuji + */ + unsigned int off = sizeof(struct ipv6hdr); + u8 nexthdr = ipv6_hdr(skb)->nexthdr; + + while (off <= opt->lastopt) { + unsigned int len; + u8 *ptr = nh + off; + + switch (nexthdr) { + case IPPROTO_DSTOPTS: + nexthdr = ptr[0]; + len = (ptr[1] + 1) << 3; + if (np->rxopt.bits.dstopts) + put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); + break; + case IPPROTO_ROUTING: + nexthdr = ptr[0]; + len = (ptr[1] + 1) << 3; + if (np->rxopt.bits.srcrt) + put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); + break; + case IPPROTO_AH: + nexthdr = ptr[0]; + len = (ptr[1] + 2) << 2; + break; + default: + nexthdr = ptr[0]; + len = (ptr[1] + 1) << 3; + break; + } + + off += len; + } + } + + /* socket options in old style */ + if (np->rxopt.bits.rxoinfo) { + struct in6_pktinfo src_info; + + src_info.ipi6_ifindex = opt->iif; + src_info.ipi6_addr = ipv6_hdr(skb)->daddr; + put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); + } + if (np->rxopt.bits.rxohlim) { + int hlim = ipv6_hdr(skb)->hop_limit; + put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); + } + if (np->rxopt.bits.ohopopts && opt->hop) { + u8 *ptr = nh + opt->hop; + put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); + } + if (np->rxopt.bits.odstopts && opt->dst0) { + u8 *ptr = nh + opt->dst0; + put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); + } + if (np->rxopt.bits.osrcrt && opt->srcrt) { + struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); + put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); + } + if (np->rxopt.bits.odstopts && opt->dst1) { + u8 *ptr = nh + opt->dst1; + put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); + } + if (np->rxopt.bits.rxorigdstaddr) { + struct sockaddr_in6 sin6; + __be16 *ports = (__be16 *) skb_transport_header(skb); + + if (skb_transport_offset(skb) + 4 <= skb->len) { + /* 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. + */ + + sin6.sin6_family = AF_INET6; + sin6.sin6_addr = ipv6_hdr(skb)->daddr; + sin6.sin6_port = ports[1]; + sin6.sin6_flowinfo = 0; + sin6.sin6_scope_id = + ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, + opt->iif); + + put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); + } + } +} + +void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, + struct sk_buff *skb) +{ + ip6_datagram_recv_common_ctl(sk, msg, skb); + ip6_datagram_recv_specific_ctl(sk, msg, skb); +} +EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); + +int ip6_datagram_send_ctl(struct net *net, struct sock *sk, + struct msghdr *msg, struct flowi6 *fl6, + struct ipv6_txoptions *opt, + int *hlimit, int *tclass, int *dontfrag) +{ + struct in6_pktinfo *src_info; + struct cmsghdr *cmsg; + struct ipv6_rt_hdr *rthdr; + struct ipv6_opt_hdr *hdr; + int len; + int err = 0; + + for_each_cmsghdr(cmsg, msg) { + int addr_type; + + if (!CMSG_OK(msg, cmsg)) { + err = -EINVAL; + goto exit_f; + } + + if (cmsg->cmsg_level != SOL_IPV6) + continue; + + switch (cmsg->cmsg_type) { + case IPV6_PKTINFO: + case IPV6_2292PKTINFO: + { + struct net_device *dev = NULL; + + if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { + err = -EINVAL; + goto exit_f; + } + + src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); + + if (src_info->ipi6_ifindex) { + if (fl6->flowi6_oif && + src_info->ipi6_ifindex != fl6->flowi6_oif) + return -EINVAL; + fl6->flowi6_oif = src_info->ipi6_ifindex; + } + + addr_type = __ipv6_addr_type(&src_info->ipi6_addr); + + rcu_read_lock(); + if (fl6->flowi6_oif) { + dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); + if (!dev) { + rcu_read_unlock(); + return -ENODEV; + } + } else if (addr_type & IPV6_ADDR_LINKLOCAL) { + rcu_read_unlock(); + return -EINVAL; + } + + if (addr_type != IPV6_ADDR_ANY) { + int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; + if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && + !ipv6_chk_addr(net, &src_info->ipi6_addr, + strict ? dev : NULL, 0) && + !ipv6_chk_acast_addr_src(net, dev, + &src_info->ipi6_addr)) + err = -EINVAL; + else + fl6->saddr = src_info->ipi6_addr; + } + + rcu_read_unlock(); + + if (err) + goto exit_f; + + break; + } + + case IPV6_FLOWINFO: + if (cmsg->cmsg_len < CMSG_LEN(4)) { + err = -EINVAL; + goto exit_f; + } + + if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { + if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { + err = -EINVAL; + goto exit_f; + } + } + fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); + break; + + case IPV6_2292HOPOPTS: + case IPV6_HOPOPTS: + if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { + err = -EINVAL; + goto exit_f; + } + + hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); + len = ((hdr->hdrlen + 1) << 3); + if (cmsg->cmsg_len < CMSG_LEN(len)) { + err = -EINVAL; + goto exit_f; + } + if (!ns_capable(net->user_ns, CAP_NET_RAW)) { + err = -EPERM; + goto exit_f; + } + opt->opt_nflen += len; + opt->hopopt = hdr; + break; + + case IPV6_2292DSTOPTS: + if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { + err = -EINVAL; + goto exit_f; + } + + hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); + len = ((hdr->hdrlen + 1) << 3); + if (cmsg->cmsg_len < CMSG_LEN(len)) { + err = -EINVAL; + goto exit_f; + } + if (!ns_capable(net->user_ns, CAP_NET_RAW)) { + err = -EPERM; + goto exit_f; + } + if (opt->dst1opt) { + err = -EINVAL; + goto exit_f; + } + opt->opt_flen += len; + opt->dst1opt = hdr; + break; + + case IPV6_DSTOPTS: + case IPV6_RTHDRDSTOPTS: + if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { + err = -EINVAL; + goto exit_f; + } + + hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); + len = ((hdr->hdrlen + 1) << 3); + if (cmsg->cmsg_len < CMSG_LEN(len)) { + err = -EINVAL; + goto exit_f; + } + if (!ns_capable(net->user_ns, CAP_NET_RAW)) { + err = -EPERM; + goto exit_f; + } + if (cmsg->cmsg_type == IPV6_DSTOPTS) { + opt->opt_flen += len; + opt->dst1opt = hdr; + } else { + opt->opt_nflen += len; + opt->dst0opt = hdr; + } + break; + + case IPV6_2292RTHDR: + case IPV6_RTHDR: + if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { + err = -EINVAL; + goto exit_f; + } + + rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); + + switch (rthdr->type) { +#if IS_ENABLED(CONFIG_IPV6_MIP6) + case IPV6_SRCRT_TYPE_2: + if (rthdr->hdrlen != 2 || + rthdr->segments_left != 1) { + err = -EINVAL; + goto exit_f; + } + break; +#endif + default: + err = -EINVAL; + goto exit_f; + } + + len = ((rthdr->hdrlen + 1) << 3); + + if (cmsg->cmsg_len < CMSG_LEN(len)) { + err = -EINVAL; + goto exit_f; + } + + /* segments left must also match */ + if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { + err = -EINVAL; + goto exit_f; + } + + opt->opt_nflen += len; + opt->srcrt = rthdr; + + if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { + int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); + + opt->opt_nflen += dsthdrlen; + opt->dst0opt = opt->dst1opt; + opt->dst1opt = NULL; + opt->opt_flen -= dsthdrlen; + } + + break; + + case IPV6_2292HOPLIMIT: + case IPV6_HOPLIMIT: + if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { + err = -EINVAL; + goto exit_f; + } + + *hlimit = *(int *)CMSG_DATA(cmsg); + if (*hlimit < -1 || *hlimit > 0xff) { + err = -EINVAL; + goto exit_f; + } + + break; + + case IPV6_TCLASS: + { + int tc; + + err = -EINVAL; + if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) + goto exit_f; + + tc = *(int *)CMSG_DATA(cmsg); + if (tc < -1 || tc > 0xff) + goto exit_f; + + err = 0; + *tclass = tc; + + break; + } + + case IPV6_DONTFRAG: + { + int df; + + err = -EINVAL; + if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) + goto exit_f; + + df = *(int *)CMSG_DATA(cmsg); + if (df < 0 || df > 1) + goto exit_f; + + err = 0; + *dontfrag = df; + + break; + } + default: + net_dbg_ratelimited("invalid cmsg type: %d\n", + cmsg->cmsg_type); + err = -EINVAL; + goto exit_f; + } + } + +exit_f: + return err; +} +EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); + +void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, + __u16 srcp, __u16 destp, int bucket) +{ + const struct in6_addr *dest, *src; + + dest = &sp->sk_v6_daddr; + src = &sp->sk_v6_rcv_saddr; + seq_printf(seq, + "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " + "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", + bucket, + 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, + sk_wmem_alloc_get(sp), + sk_rmem_alloc_get(sp), + 0, 0L, 0, + from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), + 0, + sock_i_ino(sp), + atomic_read(&sp->sk_refcnt), sp, + atomic_read(&sp->sk_drops)); +} -- cgit v1.2.3