diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /net/ipv6/datagram.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/ipv6/datagram.c')
-rw-r--r-- | net/ipv6/datagram.c | 1073 |
1 files changed, 1073 insertions, 0 deletions
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c new file mode 100644 index 0000000000..41ebc4e574 --- /dev/null +++ b/net/ipv6/datagram.c @@ -0,0 +1,1073 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * common UDP/RAW code + * Linux INET6 implementation + * + * Authors: + * Pedro Roque <roque@di.fc.ul.pt> + */ + +#include <linux/capability.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/interrupt.h> +#include <linux/socket.h> +#include <linux/sockios.h> +#include <linux/in6.h> +#include <linux/ipv6.h> +#include <linux/route.h> +#include <linux/slab.h> +#include <linux/export.h> +#include <linux/icmp.h> + +#include <net/ipv6.h> +#include <net/ndisc.h> +#include <net/addrconf.h> +#include <net/transp_v6.h> +#include <net/ip6_route.h> +#include <net/tcp_states.h> +#include <net/dsfield.h> +#include <net/sock_reuseport.h> + +#include <linux/errqueue.h> +#include <linux/uaccess.h> + +static bool ipv6_mapped_addr_any(const struct in6_addr *a) +{ + return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); +} + +static void ip6_datagram_flow_key_init(struct flowi6 *fl6, + const struct sock *sk) +{ + const struct inet_sock *inet = inet_sk(sk); + const struct ipv6_pinfo *np = inet6_sk(sk); + int oif = sk->sk_bound_dev_if; + + memset(fl6, 0, sizeof(*fl6)); + fl6->flowi6_proto = sk->sk_protocol; + fl6->daddr = sk->sk_v6_daddr; + fl6->saddr = np->saddr; + fl6->flowi6_mark = sk->sk_mark; + fl6->fl6_dport = inet->inet_dport; + fl6->fl6_sport = inet->inet_sport; + fl6->flowlabel = ip6_make_flowinfo(np->tclass, np->flow_label); + fl6->flowi6_uid = sk->sk_uid; + + if (!oif) + oif = np->sticky_pktinfo.ipi6_ifindex; + + if (!oif) { + if (ipv6_addr_is_multicast(&fl6->daddr)) + oif = np->mcast_oif; + else + oif = np->ucast_oif; + } + + fl6->flowi6_oif = oif; + security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); +} + +int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr) +{ + struct ip6_flowlabel *flowlabel = NULL; + struct in6_addr *final_p, final; + struct ipv6_txoptions *opt; + struct dst_entry *dst; + struct inet_sock *inet = inet_sk(sk); + struct ipv6_pinfo *np = inet6_sk(sk); + struct flowi6 fl6; + int err = 0; + + if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) { + flowlabel = fl6_sock_lookup(sk, np->flow_label); + if (IS_ERR(flowlabel)) + return -EINVAL; + } + ip6_datagram_flow_key_init(&fl6, sk); + + rcu_read_lock(); + opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt); + final_p = fl6_update_dst(&fl6, opt, &final); + rcu_read_unlock(); + + dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); + if (IS_ERR(dst)) { + err = PTR_ERR(dst); + goto out; + } + + if (fix_sk_saddr) { + 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_sk_dst_store_flow(sk, dst, &fl6); + +out: + fl6_sock_release(flowlabel); + return err; +} + +void ip6_datagram_release_cb(struct sock *sk) +{ + struct dst_entry *dst; + + if (ipv6_addr_v4mapped(&sk->sk_v6_daddr)) + return; + + rcu_read_lock(); + dst = __sk_dst_get(sk); + if (!dst || !dst->obsolete || + dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) { + rcu_read_unlock(); + return; + } + rcu_read_unlock(); + + ip6_datagram_dst_update(sk, false); +} +EXPORT_SYMBOL_GPL(ip6_datagram_release_cb); + +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, old_daddr; + __be32 fl6_flowlabel = 0; + __be32 old_fl6_flowlabel; + __be16 old_dport; + 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; + + if (np->sndflow) + fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; + + if (ipv6_addr_any(&usin->sin6_addr)) { + /* + * connect to self + */ + if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) + ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), + &usin->sin6_addr); + else + usin->sin6_addr = in6addr_loopback; + } + + addr_type = ipv6_addr_type(&usin->sin6_addr); + + 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_dev_equal_l3scope(sk, usin->sin6_scope_id)) { + err = -EINVAL; + goto out; + } + WRITE_ONCE(sk->sk_bound_dev_if, usin->sin6_scope_id); + } + + if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) + WRITE_ONCE(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; + } + } + + /* save the current peer information before updating it */ + old_daddr = sk->sk_v6_daddr; + old_fl6_flowlabel = np->flow_label; + old_dport = inet->inet_dport; + + 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. + */ + + err = ip6_datagram_dst_update(sk, true); + if (err) { + /* Restore the socket peer info, to keep it consistent with + * the old socket state + */ + sk->sk_v6_daddr = old_daddr; + np->flow_label = old_fl6_flowlabel; + inet->inet_dport = old_dport; + goto out; + } + + reuseport_has_conns_set(sk); + sk->sk_state = TCP_ESTABLISHED; + sk_set_txhash(sk); +out: + return err; +} +EXPORT_SYMBOL_GPL(__ip6_datagram_connect); + +int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) +{ + int res; + + lock_sock(sk); + res = __ip6_datagram_connect(sk, uaddr, addr_len); + release_sock(sk); + return res; +} +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); + +static void ipv6_icmp_error_rfc4884(const struct sk_buff *skb, + struct sock_ee_data_rfc4884 *out) +{ + switch (icmp6_hdr(skb)->icmp6_type) { + case ICMPV6_TIME_EXCEED: + case ICMPV6_DEST_UNREACH: + ip_icmp_error_rfc4884(skb, out, sizeof(struct icmp6hdr), + icmp6_hdr(skb)->icmp6_datagram_len * 8); + } +} + +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); + + if (inet6_sk(sk)->recverr_rfc4884) + ipv6_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884); + + skb_reset_transport_header(skb); + + if (sock_queue_err_skb(sk, skb)) + kfree_skb(skb); +} +EXPORT_SYMBOL_GPL(ipv6_icmp_error); + +void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) +{ + const 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; + ip6_flow_hdr(iph, 0, 0); + + 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. + */ +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 (!IP6CB(skb)->iif) + return false; + + 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 (unlikely(err)) { + kfree_skb(skb); + return err; + } + 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_cmsg_flags(inet_sk(sk))) + 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; + + consume_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->flags & IP6SKB_HOPBYHOP)) { + u8 *ptr = nh + sizeof(struct ipv6hdr); + 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->flags & IP6SKB_HOPBYHOP)) { + u8 *ptr = nh + sizeof(struct ipv6hdr); + 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[2], *ports; + + ports = skb_header_pointer(skb, skb_transport_offset(skb), + sizeof(_ports), &_ports); + if (ports) { + /* 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); + } + } + if (np->rxopt.bits.recvfragsize && opt->frag_max_size) { + int val = opt->frag_max_size; + + put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val); + } +} + +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 ipcm6_cookie *ipc6) +{ + struct in6_pktinfo *src_info; + struct cmsghdr *cmsg; + struct ipv6_rt_hdr *rthdr; + struct ipv6_opt_hdr *hdr; + struct ipv6_txoptions *opt = ipc6->opt; + 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_SOCKET) { + err = __sock_cmsg_send(sk, cmsg, &ipc6->sockc); + if (err) + return err; + continue; + } + + if (cmsg->cmsg_level != SOL_IPV6) + continue; + + switch (cmsg->cmsg_type) { + case IPV6_PKTINFO: + case IPV6_2292PKTINFO: + { + struct net_device *dev = NULL; + int src_idx; + + if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { + err = -EINVAL; + goto exit_f; + } + + src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); + src_idx = src_info->ipi6_ifindex; + + if (src_idx) { + if (fl6->flowi6_oif && + src_idx != fl6->flowi6_oif && + (READ_ONCE(sk->sk_bound_dev_if) != fl6->flowi6_oif || + !sk_dev_equal_l3scope(sk, src_idx))) + return -EINVAL; + fl6->flowi6_oif = src_idx; + } + + 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 (!ipv6_can_nonlocal_bind(net, inet_sk(sk)) && + !ipv6_chk_addr_and_flags(net, &src_info->ipi6_addr, + dev, !strict, 0, + IFA_F_TENTATIVE) && + !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; + } + + ipc6->hlimit = *(int *)CMSG_DATA(cmsg); + if (ipc6->hlimit < -1 || ipc6->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; + ipc6->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; + ipc6->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 rqueue, 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 %u\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), + rqueue, + 0, 0L, 0, + from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), + 0, + sock_i_ino(sp), + refcount_read(&sp->sk_refcnt), sp, + atomic_read(&sp->sk_drops)); +} |