mirror of
https://github.com/edk2-porting/linux-next.git
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45f6fad84c
This patch addresses multiple problems : UDP/RAW sendmsg() need to get a stable struct ipv6_txoptions while socket is not locked : Other threads can change np->opt concurrently. Dmitry posted a syzkaller (http://github.com/google/syzkaller) program desmonstrating use-after-free. Starting with TCP/DCCP lockless listeners, tcp_v6_syn_recv_sock() and dccp_v6_request_recv_sock() also need to use RCU protection to dereference np->opt once (before calling ipv6_dup_options()) This patch adds full RCU protection to np->opt Reported-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
1588 lines
39 KiB
C
1588 lines
39 KiB
C
/*
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* UDP over IPv6
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* Linux INET6 implementation
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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*
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* Based on linux/ipv4/udp.c
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*
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* Fixes:
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* Hideaki YOSHIFUJI : sin6_scope_id support
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* YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
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* Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
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* a single port at the same time.
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* Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
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* YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/in6.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/ipv6.h>
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#include <linux/icmpv6.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>
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#include <net/ndisc.h>
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#include <net/protocol.h>
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#include <net/transp_v6.h>
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#include <net/ip6_route.h>
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#include <net/raw.h>
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#include <net/tcp_states.h>
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#include <net/ip6_checksum.h>
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#include <net/xfrm.h>
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#include <net/inet6_hashtables.h>
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#include <net/busy_poll.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <trace/events/skb.h>
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#include "udp_impl.h"
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static u32 udp6_ehashfn(const struct net *net,
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const struct in6_addr *laddr,
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const u16 lport,
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const struct in6_addr *faddr,
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const __be16 fport)
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{
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static u32 udp6_ehash_secret __read_mostly;
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static u32 udp_ipv6_hash_secret __read_mostly;
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u32 lhash, fhash;
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net_get_random_once(&udp6_ehash_secret,
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sizeof(udp6_ehash_secret));
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net_get_random_once(&udp_ipv6_hash_secret,
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sizeof(udp_ipv6_hash_secret));
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lhash = (__force u32)laddr->s6_addr32[3];
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fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
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return __inet6_ehashfn(lhash, lport, fhash, fport,
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udp_ipv6_hash_secret + net_hash_mix(net));
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}
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int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
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{
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const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
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int sk2_ipv6only = inet_v6_ipv6only(sk2);
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int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
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int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
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/* if both are mapped, treat as IPv4 */
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if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
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return (!sk2_ipv6only &&
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(!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr ||
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sk->sk_rcv_saddr == sk2->sk_rcv_saddr));
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if (addr_type2 == IPV6_ADDR_ANY &&
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!(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
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return 1;
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if (addr_type == IPV6_ADDR_ANY &&
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!(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED))
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return 1;
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if (sk2_rcv_saddr6 &&
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ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6))
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return 1;
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return 0;
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}
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static u32 udp6_portaddr_hash(const struct net *net,
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const struct in6_addr *addr6,
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unsigned int port)
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{
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unsigned int hash, mix = net_hash_mix(net);
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if (ipv6_addr_any(addr6))
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hash = jhash_1word(0, mix);
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else if (ipv6_addr_v4mapped(addr6))
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hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
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else
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hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
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return hash ^ port;
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}
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int udp_v6_get_port(struct sock *sk, unsigned short snum)
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{
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unsigned int hash2_nulladdr =
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udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
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unsigned int hash2_partial =
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udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
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/* precompute partial secondary hash */
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udp_sk(sk)->udp_portaddr_hash = hash2_partial;
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return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
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}
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static void udp_v6_rehash(struct sock *sk)
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{
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u16 new_hash = udp6_portaddr_hash(sock_net(sk),
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&sk->sk_v6_rcv_saddr,
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inet_sk(sk)->inet_num);
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udp_lib_rehash(sk, new_hash);
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}
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static inline int compute_score(struct sock *sk, struct net *net,
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unsigned short hnum,
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const struct in6_addr *saddr, __be16 sport,
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const struct in6_addr *daddr, __be16 dport,
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int dif)
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{
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int score;
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struct inet_sock *inet;
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if (!net_eq(sock_net(sk), net) ||
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udp_sk(sk)->udp_port_hash != hnum ||
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sk->sk_family != PF_INET6)
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return -1;
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score = 0;
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inet = inet_sk(sk);
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if (inet->inet_dport) {
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if (inet->inet_dport != sport)
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return -1;
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score++;
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}
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if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
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if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
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return -1;
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score++;
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}
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if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
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if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
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return -1;
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score++;
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}
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if (sk->sk_bound_dev_if) {
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if (sk->sk_bound_dev_if != dif)
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return -1;
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score++;
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}
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if (sk->sk_incoming_cpu == raw_smp_processor_id())
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score++;
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return score;
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}
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static inline int compute_score2(struct sock *sk, struct net *net,
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const struct in6_addr *saddr, __be16 sport,
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const struct in6_addr *daddr,
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unsigned short hnum, int dif)
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{
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int score;
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struct inet_sock *inet;
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if (!net_eq(sock_net(sk), net) ||
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udp_sk(sk)->udp_port_hash != hnum ||
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sk->sk_family != PF_INET6)
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return -1;
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if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
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return -1;
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score = 0;
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inet = inet_sk(sk);
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if (inet->inet_dport) {
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if (inet->inet_dport != sport)
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return -1;
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score++;
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}
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if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
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if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr))
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return -1;
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score++;
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}
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if (sk->sk_bound_dev_if) {
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if (sk->sk_bound_dev_if != dif)
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return -1;
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score++;
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}
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if (sk->sk_incoming_cpu == raw_smp_processor_id())
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score++;
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return score;
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}
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/* called with read_rcu_lock() */
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static struct sock *udp6_lib_lookup2(struct net *net,
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const struct in6_addr *saddr, __be16 sport,
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const struct in6_addr *daddr, unsigned int hnum, int dif,
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struct udp_hslot *hslot2, unsigned int slot2)
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{
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struct sock *sk, *result;
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struct hlist_nulls_node *node;
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int score, badness, matches = 0, reuseport = 0;
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u32 hash = 0;
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begin:
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result = NULL;
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badness = -1;
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udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
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score = compute_score2(sk, net, saddr, sport,
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daddr, hnum, dif);
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if (score > badness) {
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result = sk;
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badness = score;
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reuseport = sk->sk_reuseport;
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if (reuseport) {
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hash = udp6_ehashfn(net, daddr, hnum,
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saddr, sport);
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matches = 1;
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}
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} else if (score == badness && reuseport) {
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matches++;
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if (reciprocal_scale(hash, matches) == 0)
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result = sk;
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hash = next_pseudo_random32(hash);
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}
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}
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/*
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* if the nulls value we got at the end of this lookup is
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* not the expected one, we must restart lookup.
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* We probably met an item that was moved to another chain.
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*/
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if (get_nulls_value(node) != slot2)
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goto begin;
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if (result) {
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if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
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result = NULL;
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else if (unlikely(compute_score2(result, net, saddr, sport,
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daddr, hnum, dif) < badness)) {
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sock_put(result);
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goto begin;
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}
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}
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return result;
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}
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struct sock *__udp6_lib_lookup(struct net *net,
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const struct in6_addr *saddr, __be16 sport,
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const struct in6_addr *daddr, __be16 dport,
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int dif, struct udp_table *udptable)
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{
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struct sock *sk, *result;
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struct hlist_nulls_node *node;
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unsigned short hnum = ntohs(dport);
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unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
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struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
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int score, badness, matches = 0, reuseport = 0;
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u32 hash = 0;
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rcu_read_lock();
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if (hslot->count > 10) {
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hash2 = udp6_portaddr_hash(net, daddr, hnum);
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slot2 = hash2 & udptable->mask;
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hslot2 = &udptable->hash2[slot2];
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if (hslot->count < hslot2->count)
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goto begin;
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result = udp6_lib_lookup2(net, saddr, sport,
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daddr, hnum, dif,
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hslot2, slot2);
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if (!result) {
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hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
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slot2 = hash2 & udptable->mask;
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hslot2 = &udptable->hash2[slot2];
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if (hslot->count < hslot2->count)
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goto begin;
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result = udp6_lib_lookup2(net, saddr, sport,
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&in6addr_any, hnum, dif,
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hslot2, slot2);
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}
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rcu_read_unlock();
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return result;
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}
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begin:
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result = NULL;
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badness = -1;
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sk_nulls_for_each_rcu(sk, node, &hslot->head) {
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score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
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if (score > badness) {
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result = sk;
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badness = score;
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reuseport = sk->sk_reuseport;
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if (reuseport) {
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hash = udp6_ehashfn(net, daddr, hnum,
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saddr, sport);
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matches = 1;
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}
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} else if (score == badness && reuseport) {
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matches++;
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if (reciprocal_scale(hash, matches) == 0)
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result = sk;
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hash = next_pseudo_random32(hash);
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}
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}
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/*
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* if the nulls value we got at the end of this lookup is
|
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* not the expected one, we must restart lookup.
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* We probably met an item that was moved to another chain.
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*/
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if (get_nulls_value(node) != slot)
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goto begin;
|
|
|
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if (result) {
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if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
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result = NULL;
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else if (unlikely(compute_score(result, net, hnum, saddr, sport,
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daddr, dport, dif) < badness)) {
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sock_put(result);
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goto begin;
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}
|
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}
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rcu_read_unlock();
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return result;
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}
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EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
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|
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static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
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__be16 sport, __be16 dport,
|
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struct udp_table *udptable)
|
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{
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struct sock *sk;
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const struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
|
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sk = skb_steal_sock(skb);
|
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if (unlikely(sk))
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return sk;
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return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
|
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&iph->daddr, dport, inet6_iif(skb),
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udptable);
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}
|
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|
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struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
|
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const struct in6_addr *daddr, __be16 dport, int dif)
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{
|
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return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
|
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}
|
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EXPORT_SYMBOL_GPL(udp6_lib_lookup);
|
|
|
|
/*
|
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* This should be easy, if there is something there we
|
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* return it, otherwise we block.
|
|
*/
|
|
|
|
int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
|
|
int noblock, int flags, int *addr_len)
|
|
{
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct sk_buff *skb;
|
|
unsigned int ulen, copied;
|
|
int peeked, off = 0;
|
|
int err;
|
|
int is_udplite = IS_UDPLITE(sk);
|
|
int is_udp4;
|
|
bool slow;
|
|
|
|
if (flags & MSG_ERRQUEUE)
|
|
return ipv6_recv_error(sk, msg, len, addr_len);
|
|
|
|
if (np->rxpmtu && np->rxopt.bits.rxpmtu)
|
|
return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
|
|
|
|
try_again:
|
|
skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
|
|
&peeked, &off, &err);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
ulen = skb->len - sizeof(struct udphdr);
|
|
copied = len;
|
|
if (copied > ulen)
|
|
copied = ulen;
|
|
else if (copied < ulen)
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
|
|
is_udp4 = (skb->protocol == htons(ETH_P_IP));
|
|
|
|
/*
|
|
* If checksum is needed at all, try to do it while copying the
|
|
* data. If the data is truncated, or if we only want a partial
|
|
* coverage checksum (UDP-Lite), do it before the copy.
|
|
*/
|
|
|
|
if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
|
|
if (udp_lib_checksum_complete(skb))
|
|
goto csum_copy_err;
|
|
}
|
|
|
|
if (skb_csum_unnecessary(skb))
|
|
err = skb_copy_datagram_msg(skb, sizeof(struct udphdr),
|
|
msg, copied);
|
|
else {
|
|
err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg);
|
|
if (err == -EINVAL)
|
|
goto csum_copy_err;
|
|
}
|
|
if (unlikely(err)) {
|
|
trace_kfree_skb(skb, udpv6_recvmsg);
|
|
if (!peeked) {
|
|
atomic_inc(&sk->sk_drops);
|
|
if (is_udp4)
|
|
UDP_INC_STATS_USER(sock_net(sk),
|
|
UDP_MIB_INERRORS,
|
|
is_udplite);
|
|
else
|
|
UDP6_INC_STATS_USER(sock_net(sk),
|
|
UDP_MIB_INERRORS,
|
|
is_udplite);
|
|
}
|
|
goto out_free;
|
|
}
|
|
if (!peeked) {
|
|
if (is_udp4)
|
|
UDP_INC_STATS_USER(sock_net(sk),
|
|
UDP_MIB_INDATAGRAMS, is_udplite);
|
|
else
|
|
UDP6_INC_STATS_USER(sock_net(sk),
|
|
UDP_MIB_INDATAGRAMS, is_udplite);
|
|
}
|
|
|
|
sock_recv_ts_and_drops(msg, sk, skb);
|
|
|
|
/* Copy the address. */
|
|
if (msg->msg_name) {
|
|
DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
|
|
sin6->sin6_family = AF_INET6;
|
|
sin6->sin6_port = udp_hdr(skb)->source;
|
|
sin6->sin6_flowinfo = 0;
|
|
|
|
if (is_udp4) {
|
|
ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
|
|
&sin6->sin6_addr);
|
|
sin6->sin6_scope_id = 0;
|
|
} else {
|
|
sin6->sin6_addr = ipv6_hdr(skb)->saddr;
|
|
sin6->sin6_scope_id =
|
|
ipv6_iface_scope_id(&sin6->sin6_addr,
|
|
inet6_iif(skb));
|
|
}
|
|
*addr_len = sizeof(*sin6);
|
|
}
|
|
|
|
if (np->rxopt.all)
|
|
ip6_datagram_recv_common_ctl(sk, msg, skb);
|
|
|
|
if (is_udp4) {
|
|
if (inet->cmsg_flags)
|
|
ip_cmsg_recv(msg, skb);
|
|
} else {
|
|
if (np->rxopt.all)
|
|
ip6_datagram_recv_specific_ctl(sk, msg, skb);
|
|
}
|
|
|
|
err = copied;
|
|
if (flags & MSG_TRUNC)
|
|
err = ulen;
|
|
|
|
out_free:
|
|
skb_free_datagram_locked(sk, skb);
|
|
out:
|
|
return err;
|
|
|
|
csum_copy_err:
|
|
slow = lock_sock_fast(sk);
|
|
if (!skb_kill_datagram(sk, skb, flags)) {
|
|
if (is_udp4) {
|
|
UDP_INC_STATS_USER(sock_net(sk),
|
|
UDP_MIB_CSUMERRORS, is_udplite);
|
|
UDP_INC_STATS_USER(sock_net(sk),
|
|
UDP_MIB_INERRORS, is_udplite);
|
|
} else {
|
|
UDP6_INC_STATS_USER(sock_net(sk),
|
|
UDP_MIB_CSUMERRORS, is_udplite);
|
|
UDP6_INC_STATS_USER(sock_net(sk),
|
|
UDP_MIB_INERRORS, is_udplite);
|
|
}
|
|
}
|
|
unlock_sock_fast(sk, slow);
|
|
|
|
/* starting over for a new packet, but check if we need to yield */
|
|
cond_resched();
|
|
msg->msg_flags &= ~MSG_TRUNC;
|
|
goto try_again;
|
|
}
|
|
|
|
void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
|
u8 type, u8 code, int offset, __be32 info,
|
|
struct udp_table *udptable)
|
|
{
|
|
struct ipv6_pinfo *np;
|
|
const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
|
|
const struct in6_addr *saddr = &hdr->saddr;
|
|
const struct in6_addr *daddr = &hdr->daddr;
|
|
struct udphdr *uh = (struct udphdr *)(skb->data+offset);
|
|
struct sock *sk;
|
|
int err;
|
|
struct net *net = dev_net(skb->dev);
|
|
|
|
sk = __udp6_lib_lookup(net, daddr, uh->dest,
|
|
saddr, uh->source, inet6_iif(skb), udptable);
|
|
if (!sk) {
|
|
ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
|
|
ICMP6_MIB_INERRORS);
|
|
return;
|
|
}
|
|
|
|
if (type == ICMPV6_PKT_TOOBIG) {
|
|
if (!ip6_sk_accept_pmtu(sk))
|
|
goto out;
|
|
ip6_sk_update_pmtu(skb, sk, info);
|
|
}
|
|
if (type == NDISC_REDIRECT) {
|
|
ip6_sk_redirect(skb, sk);
|
|
goto out;
|
|
}
|
|
|
|
np = inet6_sk(sk);
|
|
|
|
if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
|
|
goto out;
|
|
|
|
if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
|
|
goto out;
|
|
|
|
if (np->recverr)
|
|
ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
|
|
|
|
sk->sk_err = err;
|
|
sk->sk_error_report(sk);
|
|
out:
|
|
sock_put(sk);
|
|
}
|
|
|
|
static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
int rc;
|
|
|
|
if (!ipv6_addr_any(&sk->sk_v6_daddr)) {
|
|
sock_rps_save_rxhash(sk, skb);
|
|
sk_mark_napi_id(sk, skb);
|
|
sk_incoming_cpu_update(sk);
|
|
}
|
|
|
|
rc = sock_queue_rcv_skb(sk, skb);
|
|
if (rc < 0) {
|
|
int is_udplite = IS_UDPLITE(sk);
|
|
|
|
/* Note that an ENOMEM error is charged twice */
|
|
if (rc == -ENOMEM)
|
|
UDP6_INC_STATS_BH(sock_net(sk),
|
|
UDP_MIB_RCVBUFERRORS, is_udplite);
|
|
UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
|
|
kfree_skb(skb);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static __inline__ void udpv6_err(struct sk_buff *skb,
|
|
struct inet6_skb_parm *opt, u8 type,
|
|
u8 code, int offset, __be32 info)
|
|
{
|
|
__udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
|
|
}
|
|
|
|
static struct static_key udpv6_encap_needed __read_mostly;
|
|
void udpv6_encap_enable(void)
|
|
{
|
|
if (!static_key_enabled(&udpv6_encap_needed))
|
|
static_key_slow_inc(&udpv6_encap_needed);
|
|
}
|
|
EXPORT_SYMBOL(udpv6_encap_enable);
|
|
|
|
int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct udp_sock *up = udp_sk(sk);
|
|
int rc;
|
|
int is_udplite = IS_UDPLITE(sk);
|
|
|
|
if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
|
|
goto drop;
|
|
|
|
if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
|
|
int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
|
|
|
|
/*
|
|
* This is an encapsulation socket so pass the skb to
|
|
* the socket's udp_encap_rcv() hook. Otherwise, just
|
|
* fall through and pass this up the UDP socket.
|
|
* up->encap_rcv() returns the following value:
|
|
* =0 if skb was successfully passed to the encap
|
|
* handler or was discarded by it.
|
|
* >0 if skb should be passed on to UDP.
|
|
* <0 if skb should be resubmitted as proto -N
|
|
*/
|
|
|
|
/* if we're overly short, let UDP handle it */
|
|
encap_rcv = ACCESS_ONCE(up->encap_rcv);
|
|
if (skb->len > sizeof(struct udphdr) && encap_rcv) {
|
|
int ret;
|
|
|
|
/* Verify checksum before giving to encap */
|
|
if (udp_lib_checksum_complete(skb))
|
|
goto csum_error;
|
|
|
|
ret = encap_rcv(sk, skb);
|
|
if (ret <= 0) {
|
|
UDP_INC_STATS_BH(sock_net(sk),
|
|
UDP_MIB_INDATAGRAMS,
|
|
is_udplite);
|
|
return -ret;
|
|
}
|
|
}
|
|
|
|
/* FALLTHROUGH -- it's a UDP Packet */
|
|
}
|
|
|
|
/*
|
|
* UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
|
|
*/
|
|
if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
|
|
|
|
if (up->pcrlen == 0) { /* full coverage was set */
|
|
net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
|
|
UDP_SKB_CB(skb)->cscov, skb->len);
|
|
goto drop;
|
|
}
|
|
if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
|
|
net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
|
|
UDP_SKB_CB(skb)->cscov, up->pcrlen);
|
|
goto drop;
|
|
}
|
|
}
|
|
|
|
if (rcu_access_pointer(sk->sk_filter)) {
|
|
if (udp_lib_checksum_complete(skb))
|
|
goto csum_error;
|
|
}
|
|
|
|
if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
|
|
UDP6_INC_STATS_BH(sock_net(sk),
|
|
UDP_MIB_RCVBUFERRORS, is_udplite);
|
|
goto drop;
|
|
}
|
|
|
|
skb_dst_drop(skb);
|
|
|
|
bh_lock_sock(sk);
|
|
rc = 0;
|
|
if (!sock_owned_by_user(sk))
|
|
rc = __udpv6_queue_rcv_skb(sk, skb);
|
|
else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
|
|
bh_unlock_sock(sk);
|
|
goto drop;
|
|
}
|
|
bh_unlock_sock(sk);
|
|
|
|
return rc;
|
|
|
|
csum_error:
|
|
UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
|
|
drop:
|
|
UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
|
|
atomic_inc(&sk->sk_drops);
|
|
kfree_skb(skb);
|
|
return -1;
|
|
}
|
|
|
|
static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
|
|
__be16 loc_port, const struct in6_addr *loc_addr,
|
|
__be16 rmt_port, const struct in6_addr *rmt_addr,
|
|
int dif, unsigned short hnum)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
if (!net_eq(sock_net(sk), net))
|
|
return false;
|
|
|
|
if (udp_sk(sk)->udp_port_hash != hnum ||
|
|
sk->sk_family != PF_INET6 ||
|
|
(inet->inet_dport && inet->inet_dport != rmt_port) ||
|
|
(!ipv6_addr_any(&sk->sk_v6_daddr) &&
|
|
!ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
|
|
(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
|
|
(!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
|
|
!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
|
|
return false;
|
|
if (!inet6_mc_check(sk, loc_addr, rmt_addr))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static void flush_stack(struct sock **stack, unsigned int count,
|
|
struct sk_buff *skb, unsigned int final)
|
|
{
|
|
struct sk_buff *skb1 = NULL;
|
|
struct sock *sk;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
sk = stack[i];
|
|
if (likely(!skb1))
|
|
skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
|
|
if (!skb1) {
|
|
atomic_inc(&sk->sk_drops);
|
|
UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
|
|
IS_UDPLITE(sk));
|
|
UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
|
|
IS_UDPLITE(sk));
|
|
}
|
|
|
|
if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
|
|
skb1 = NULL;
|
|
sock_put(sk);
|
|
}
|
|
if (unlikely(skb1))
|
|
kfree_skb(skb1);
|
|
}
|
|
|
|
static void udp6_csum_zero_error(struct sk_buff *skb)
|
|
{
|
|
/* RFC 2460 section 8.1 says that we SHOULD log
|
|
* this error. Well, it is reasonable.
|
|
*/
|
|
net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
|
|
&ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source),
|
|
&ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest));
|
|
}
|
|
|
|
/*
|
|
* Note: called only from the BH handler context,
|
|
* so we don't need to lock the hashes.
|
|
*/
|
|
static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
|
|
const struct in6_addr *saddr, const struct in6_addr *daddr,
|
|
struct udp_table *udptable, int proto)
|
|
{
|
|
struct sock *sk, *stack[256 / sizeof(struct sock *)];
|
|
const struct udphdr *uh = udp_hdr(skb);
|
|
struct hlist_nulls_node *node;
|
|
unsigned short hnum = ntohs(uh->dest);
|
|
struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
|
|
int dif = inet6_iif(skb);
|
|
unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node);
|
|
unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
|
|
bool inner_flushed = false;
|
|
|
|
if (use_hash2) {
|
|
hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
|
|
udp_table.mask;
|
|
hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask;
|
|
start_lookup:
|
|
hslot = &udp_table.hash2[hash2];
|
|
offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
|
|
}
|
|
|
|
spin_lock(&hslot->lock);
|
|
sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) {
|
|
if (__udp_v6_is_mcast_sock(net, sk,
|
|
uh->dest, daddr,
|
|
uh->source, saddr,
|
|
dif, hnum) &&
|
|
/* If zero checksum and no_check is not on for
|
|
* the socket then skip it.
|
|
*/
|
|
(uh->check || udp_sk(sk)->no_check6_rx)) {
|
|
if (unlikely(count == ARRAY_SIZE(stack))) {
|
|
flush_stack(stack, count, skb, ~0);
|
|
inner_flushed = true;
|
|
count = 0;
|
|
}
|
|
stack[count++] = sk;
|
|
sock_hold(sk);
|
|
}
|
|
}
|
|
|
|
spin_unlock(&hslot->lock);
|
|
|
|
/* Also lookup *:port if we are using hash2 and haven't done so yet. */
|
|
if (use_hash2 && hash2 != hash2_any) {
|
|
hash2 = hash2_any;
|
|
goto start_lookup;
|
|
}
|
|
|
|
if (count) {
|
|
flush_stack(stack, count, skb, count - 1);
|
|
} else {
|
|
if (!inner_flushed)
|
|
UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
|
|
proto == IPPROTO_UDPLITE);
|
|
consume_skb(skb);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
|
|
int proto)
|
|
{
|
|
struct net *net = dev_net(skb->dev);
|
|
struct sock *sk;
|
|
struct udphdr *uh;
|
|
const struct in6_addr *saddr, *daddr;
|
|
u32 ulen = 0;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct udphdr)))
|
|
goto discard;
|
|
|
|
saddr = &ipv6_hdr(skb)->saddr;
|
|
daddr = &ipv6_hdr(skb)->daddr;
|
|
uh = udp_hdr(skb);
|
|
|
|
ulen = ntohs(uh->len);
|
|
if (ulen > skb->len)
|
|
goto short_packet;
|
|
|
|
if (proto == IPPROTO_UDP) {
|
|
/* UDP validates ulen. */
|
|
|
|
/* Check for jumbo payload */
|
|
if (ulen == 0)
|
|
ulen = skb->len;
|
|
|
|
if (ulen < sizeof(*uh))
|
|
goto short_packet;
|
|
|
|
if (ulen < skb->len) {
|
|
if (pskb_trim_rcsum(skb, ulen))
|
|
goto short_packet;
|
|
saddr = &ipv6_hdr(skb)->saddr;
|
|
daddr = &ipv6_hdr(skb)->daddr;
|
|
uh = udp_hdr(skb);
|
|
}
|
|
}
|
|
|
|
if (udp6_csum_init(skb, uh, proto))
|
|
goto csum_error;
|
|
|
|
/*
|
|
* Multicast receive code
|
|
*/
|
|
if (ipv6_addr_is_multicast(daddr))
|
|
return __udp6_lib_mcast_deliver(net, skb,
|
|
saddr, daddr, udptable, proto);
|
|
|
|
/* Unicast */
|
|
|
|
/*
|
|
* check socket cache ... must talk to Alan about his plans
|
|
* for sock caches... i'll skip this for now.
|
|
*/
|
|
sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
|
|
if (sk) {
|
|
int ret;
|
|
|
|
if (!uh->check && !udp_sk(sk)->no_check6_rx) {
|
|
sock_put(sk);
|
|
udp6_csum_zero_error(skb);
|
|
goto csum_error;
|
|
}
|
|
|
|
if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
|
|
skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
|
|
ip6_compute_pseudo);
|
|
|
|
ret = udpv6_queue_rcv_skb(sk, skb);
|
|
sock_put(sk);
|
|
|
|
/* a return value > 0 means to resubmit the input, but
|
|
* it wants the return to be -protocol, or 0
|
|
*/
|
|
if (ret > 0)
|
|
return -ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (!uh->check) {
|
|
udp6_csum_zero_error(skb);
|
|
goto csum_error;
|
|
}
|
|
|
|
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
|
|
goto discard;
|
|
|
|
if (udp_lib_checksum_complete(skb))
|
|
goto csum_error;
|
|
|
|
UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
|
|
|
|
kfree_skb(skb);
|
|
return 0;
|
|
|
|
short_packet:
|
|
net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
|
|
proto == IPPROTO_UDPLITE ? "-Lite" : "",
|
|
saddr, ntohs(uh->source),
|
|
ulen, skb->len,
|
|
daddr, ntohs(uh->dest));
|
|
goto discard;
|
|
csum_error:
|
|
UDP6_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
|
|
discard:
|
|
UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static __inline__ int udpv6_rcv(struct sk_buff *skb)
|
|
{
|
|
return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
|
|
}
|
|
|
|
/*
|
|
* Throw away all pending data and cancel the corking. Socket is locked.
|
|
*/
|
|
static void udp_v6_flush_pending_frames(struct sock *sk)
|
|
{
|
|
struct udp_sock *up = udp_sk(sk);
|
|
|
|
if (up->pending == AF_INET)
|
|
udp_flush_pending_frames(sk);
|
|
else if (up->pending) {
|
|
up->len = 0;
|
|
up->pending = 0;
|
|
ip6_flush_pending_frames(sk);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* udp6_hwcsum_outgoing - handle outgoing HW checksumming
|
|
* @sk: socket we are sending on
|
|
* @skb: sk_buff containing the filled-in UDP header
|
|
* (checksum field must be zeroed out)
|
|
*/
|
|
static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
|
|
const struct in6_addr *saddr,
|
|
const struct in6_addr *daddr, int len)
|
|
{
|
|
unsigned int offset;
|
|
struct udphdr *uh = udp_hdr(skb);
|
|
struct sk_buff *frags = skb_shinfo(skb)->frag_list;
|
|
__wsum csum = 0;
|
|
|
|
if (!frags) {
|
|
/* Only one fragment on the socket. */
|
|
skb->csum_start = skb_transport_header(skb) - skb->head;
|
|
skb->csum_offset = offsetof(struct udphdr, check);
|
|
uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
|
|
} else {
|
|
/*
|
|
* HW-checksum won't work as there are two or more
|
|
* fragments on the socket so that all csums of sk_buffs
|
|
* should be together
|
|
*/
|
|
offset = skb_transport_offset(skb);
|
|
skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
|
|
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
do {
|
|
csum = csum_add(csum, frags->csum);
|
|
} while ((frags = frags->next));
|
|
|
|
uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
|
|
csum);
|
|
if (uh->check == 0)
|
|
uh->check = CSUM_MANGLED_0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Sending
|
|
*/
|
|
|
|
static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6)
|
|
{
|
|
struct sock *sk = skb->sk;
|
|
struct udphdr *uh;
|
|
int err = 0;
|
|
int is_udplite = IS_UDPLITE(sk);
|
|
__wsum csum = 0;
|
|
int offset = skb_transport_offset(skb);
|
|
int len = skb->len - offset;
|
|
|
|
/*
|
|
* Create a UDP header
|
|
*/
|
|
uh = udp_hdr(skb);
|
|
uh->source = fl6->fl6_sport;
|
|
uh->dest = fl6->fl6_dport;
|
|
uh->len = htons(len);
|
|
uh->check = 0;
|
|
|
|
if (is_udplite)
|
|
csum = udplite_csum(skb);
|
|
else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
goto send;
|
|
} else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
|
|
udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len);
|
|
goto send;
|
|
} else
|
|
csum = udp_csum(skb);
|
|
|
|
/* add protocol-dependent pseudo-header */
|
|
uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
|
|
len, fl6->flowi6_proto, csum);
|
|
if (uh->check == 0)
|
|
uh->check = CSUM_MANGLED_0;
|
|
|
|
send:
|
|
err = ip6_send_skb(skb);
|
|
if (err) {
|
|
if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
|
|
UDP6_INC_STATS_USER(sock_net(sk),
|
|
UDP_MIB_SNDBUFERRORS, is_udplite);
|
|
err = 0;
|
|
}
|
|
} else
|
|
UDP6_INC_STATS_USER(sock_net(sk),
|
|
UDP_MIB_OUTDATAGRAMS, is_udplite);
|
|
return err;
|
|
}
|
|
|
|
static int udp_v6_push_pending_frames(struct sock *sk)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct udp_sock *up = udp_sk(sk);
|
|
struct flowi6 fl6;
|
|
int err = 0;
|
|
|
|
if (up->pending == AF_INET)
|
|
return udp_push_pending_frames(sk);
|
|
|
|
/* ip6_finish_skb will release the cork, so make a copy of
|
|
* fl6 here.
|
|
*/
|
|
fl6 = inet_sk(sk)->cork.fl.u.ip6;
|
|
|
|
skb = ip6_finish_skb(sk);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
err = udp_v6_send_skb(skb, &fl6);
|
|
|
|
out:
|
|
up->len = 0;
|
|
up->pending = 0;
|
|
return err;
|
|
}
|
|
|
|
int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
|
|
{
|
|
struct ipv6_txoptions opt_space;
|
|
struct udp_sock *up = udp_sk(sk);
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
|
|
struct in6_addr *daddr, *final_p, final;
|
|
struct ipv6_txoptions *opt = NULL;
|
|
struct ipv6_txoptions *opt_to_free = NULL;
|
|
struct ip6_flowlabel *flowlabel = NULL;
|
|
struct flowi6 fl6;
|
|
struct dst_entry *dst;
|
|
int addr_len = msg->msg_namelen;
|
|
int ulen = len;
|
|
int hlimit = -1;
|
|
int tclass = -1;
|
|
int dontfrag = -1;
|
|
int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
|
|
int err;
|
|
int connected = 0;
|
|
int is_udplite = IS_UDPLITE(sk);
|
|
int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
|
|
|
|
/* destination address check */
|
|
if (sin6) {
|
|
if (addr_len < offsetof(struct sockaddr, sa_data))
|
|
return -EINVAL;
|
|
|
|
switch (sin6->sin6_family) {
|
|
case AF_INET6:
|
|
if (addr_len < SIN6_LEN_RFC2133)
|
|
return -EINVAL;
|
|
daddr = &sin6->sin6_addr;
|
|
break;
|
|
case AF_INET:
|
|
goto do_udp_sendmsg;
|
|
case AF_UNSPEC:
|
|
msg->msg_name = sin6 = NULL;
|
|
msg->msg_namelen = addr_len = 0;
|
|
daddr = NULL;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
} else if (!up->pending) {
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
return -EDESTADDRREQ;
|
|
daddr = &sk->sk_v6_daddr;
|
|
} else
|
|
daddr = NULL;
|
|
|
|
if (daddr) {
|
|
if (ipv6_addr_v4mapped(daddr)) {
|
|
struct sockaddr_in sin;
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
|
|
sin.sin_addr.s_addr = daddr->s6_addr32[3];
|
|
msg->msg_name = &sin;
|
|
msg->msg_namelen = sizeof(sin);
|
|
do_udp_sendmsg:
|
|
if (__ipv6_only_sock(sk))
|
|
return -ENETUNREACH;
|
|
return udp_sendmsg(sk, msg, len);
|
|
}
|
|
}
|
|
|
|
if (up->pending == AF_INET)
|
|
return udp_sendmsg(sk, msg, len);
|
|
|
|
/* Rough check on arithmetic overflow,
|
|
better check is made in ip6_append_data().
|
|
*/
|
|
if (len > INT_MAX - sizeof(struct udphdr))
|
|
return -EMSGSIZE;
|
|
|
|
getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
|
|
if (up->pending) {
|
|
/*
|
|
* There are pending frames.
|
|
* The socket lock must be held while it's corked.
|
|
*/
|
|
lock_sock(sk);
|
|
if (likely(up->pending)) {
|
|
if (unlikely(up->pending != AF_INET6)) {
|
|
release_sock(sk);
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
dst = NULL;
|
|
goto do_append_data;
|
|
}
|
|
release_sock(sk);
|
|
}
|
|
ulen += sizeof(struct udphdr);
|
|
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
|
|
if (sin6) {
|
|
if (sin6->sin6_port == 0)
|
|
return -EINVAL;
|
|
|
|
fl6.fl6_dport = sin6->sin6_port;
|
|
daddr = &sin6->sin6_addr;
|
|
|
|
if (np->sndflow) {
|
|
fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
|
|
if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
|
|
flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
|
|
if (!flowlabel)
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Otherwise it will be difficult to maintain
|
|
* sk->sk_dst_cache.
|
|
*/
|
|
if (sk->sk_state == TCP_ESTABLISHED &&
|
|
ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
|
|
daddr = &sk->sk_v6_daddr;
|
|
|
|
if (addr_len >= sizeof(struct sockaddr_in6) &&
|
|
sin6->sin6_scope_id &&
|
|
__ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
|
|
fl6.flowi6_oif = sin6->sin6_scope_id;
|
|
} else {
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
return -EDESTADDRREQ;
|
|
|
|
fl6.fl6_dport = inet->inet_dport;
|
|
daddr = &sk->sk_v6_daddr;
|
|
fl6.flowlabel = np->flow_label;
|
|
connected = 1;
|
|
}
|
|
|
|
if (!fl6.flowi6_oif)
|
|
fl6.flowi6_oif = sk->sk_bound_dev_if;
|
|
|
|
if (!fl6.flowi6_oif)
|
|
fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
|
|
|
|
fl6.flowi6_mark = sk->sk_mark;
|
|
|
|
if (msg->msg_controllen) {
|
|
opt = &opt_space;
|
|
memset(opt, 0, sizeof(struct ipv6_txoptions));
|
|
opt->tot_len = sizeof(*opt);
|
|
|
|
err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
|
|
&hlimit, &tclass, &dontfrag);
|
|
if (err < 0) {
|
|
fl6_sock_release(flowlabel);
|
|
return err;
|
|
}
|
|
if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
|
|
flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
|
|
if (!flowlabel)
|
|
return -EINVAL;
|
|
}
|
|
if (!(opt->opt_nflen|opt->opt_flen))
|
|
opt = NULL;
|
|
connected = 0;
|
|
}
|
|
if (!opt) {
|
|
opt = txopt_get(np);
|
|
opt_to_free = opt;
|
|
}
|
|
if (flowlabel)
|
|
opt = fl6_merge_options(&opt_space, flowlabel, opt);
|
|
opt = ipv6_fixup_options(&opt_space, opt);
|
|
|
|
fl6.flowi6_proto = sk->sk_protocol;
|
|
if (!ipv6_addr_any(daddr))
|
|
fl6.daddr = *daddr;
|
|
else
|
|
fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
|
|
if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
|
|
fl6.saddr = np->saddr;
|
|
fl6.fl6_sport = inet->inet_sport;
|
|
|
|
final_p = fl6_update_dst(&fl6, opt, &final);
|
|
if (final_p)
|
|
connected = 0;
|
|
|
|
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
|
|
fl6.flowi6_oif = np->mcast_oif;
|
|
connected = 0;
|
|
} else if (!fl6.flowi6_oif)
|
|
fl6.flowi6_oif = np->ucast_oif;
|
|
|
|
security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
|
|
|
|
dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
|
|
if (IS_ERR(dst)) {
|
|
err = PTR_ERR(dst);
|
|
dst = NULL;
|
|
goto out;
|
|
}
|
|
|
|
if (hlimit < 0)
|
|
hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
|
|
|
|
if (tclass < 0)
|
|
tclass = np->tclass;
|
|
|
|
if (msg->msg_flags&MSG_CONFIRM)
|
|
goto do_confirm;
|
|
back_from_confirm:
|
|
|
|
/* Lockless fast path for the non-corking case */
|
|
if (!corkreq) {
|
|
struct sk_buff *skb;
|
|
|
|
skb = ip6_make_skb(sk, getfrag, msg, ulen,
|
|
sizeof(struct udphdr), hlimit, tclass, opt,
|
|
&fl6, (struct rt6_info *)dst,
|
|
msg->msg_flags, dontfrag);
|
|
err = PTR_ERR(skb);
|
|
if (!IS_ERR_OR_NULL(skb))
|
|
err = udp_v6_send_skb(skb, &fl6);
|
|
goto release_dst;
|
|
}
|
|
|
|
lock_sock(sk);
|
|
if (unlikely(up->pending)) {
|
|
/* The socket is already corked while preparing it. */
|
|
/* ... which is an evident application bug. --ANK */
|
|
release_sock(sk);
|
|
|
|
net_dbg_ratelimited("udp cork app bug 2\n");
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
up->pending = AF_INET6;
|
|
|
|
do_append_data:
|
|
if (dontfrag < 0)
|
|
dontfrag = np->dontfrag;
|
|
up->len += ulen;
|
|
err = ip6_append_data(sk, getfrag, msg, ulen,
|
|
sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
|
|
(struct rt6_info *)dst,
|
|
corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
|
|
if (err)
|
|
udp_v6_flush_pending_frames(sk);
|
|
else if (!corkreq)
|
|
err = udp_v6_push_pending_frames(sk);
|
|
else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
|
|
up->pending = 0;
|
|
|
|
if (err > 0)
|
|
err = np->recverr ? net_xmit_errno(err) : 0;
|
|
release_sock(sk);
|
|
|
|
release_dst:
|
|
if (dst) {
|
|
if (connected) {
|
|
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);
|
|
} else {
|
|
dst_release(dst);
|
|
}
|
|
dst = NULL;
|
|
}
|
|
|
|
out:
|
|
dst_release(dst);
|
|
fl6_sock_release(flowlabel);
|
|
txopt_put(opt_to_free);
|
|
if (!err)
|
|
return len;
|
|
/*
|
|
* ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
|
|
* ENOBUFS might not be good (it's not tunable per se), but otherwise
|
|
* we don't have a good statistic (IpOutDiscards but it can be too many
|
|
* things). We could add another new stat but at least for now that
|
|
* seems like overkill.
|
|
*/
|
|
if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
|
|
UDP6_INC_STATS_USER(sock_net(sk),
|
|
UDP_MIB_SNDBUFERRORS, is_udplite);
|
|
}
|
|
return err;
|
|
|
|
do_confirm:
|
|
dst_confirm(dst);
|
|
if (!(msg->msg_flags&MSG_PROBE) || len)
|
|
goto back_from_confirm;
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
|
|
void udpv6_destroy_sock(struct sock *sk)
|
|
{
|
|
struct udp_sock *up = udp_sk(sk);
|
|
lock_sock(sk);
|
|
udp_v6_flush_pending_frames(sk);
|
|
release_sock(sk);
|
|
|
|
if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
|
|
void (*encap_destroy)(struct sock *sk);
|
|
encap_destroy = ACCESS_ONCE(up->encap_destroy);
|
|
if (encap_destroy)
|
|
encap_destroy(sk);
|
|
}
|
|
|
|
inet6_destroy_sock(sk);
|
|
}
|
|
|
|
/*
|
|
* Socket option code for UDP
|
|
*/
|
|
int udpv6_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
if (level == SOL_UDP || level == SOL_UDPLITE)
|
|
return udp_lib_setsockopt(sk, level, optname, optval, optlen,
|
|
udp_v6_push_pending_frames);
|
|
return ipv6_setsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
if (level == SOL_UDP || level == SOL_UDPLITE)
|
|
return udp_lib_setsockopt(sk, level, optname, optval, optlen,
|
|
udp_v6_push_pending_frames);
|
|
return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
#endif
|
|
|
|
int udpv6_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
if (level == SOL_UDP || level == SOL_UDPLITE)
|
|
return udp_lib_getsockopt(sk, level, optname, optval, optlen);
|
|
return ipv6_getsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
if (level == SOL_UDP || level == SOL_UDPLITE)
|
|
return udp_lib_getsockopt(sk, level, optname, optval, optlen);
|
|
return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
#endif
|
|
|
|
static const struct inet6_protocol udpv6_protocol = {
|
|
.handler = udpv6_rcv,
|
|
.err_handler = udpv6_err,
|
|
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
|
|
};
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
#ifdef CONFIG_PROC_FS
|
|
int udp6_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
if (v == SEQ_START_TOKEN) {
|
|
seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
|
|
} else {
|
|
int bucket = ((struct udp_iter_state *)seq->private)->bucket;
|
|
struct inet_sock *inet = inet_sk(v);
|
|
__u16 srcp = ntohs(inet->inet_sport);
|
|
__u16 destp = ntohs(inet->inet_dport);
|
|
ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations udp6_afinfo_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = udp_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net
|
|
};
|
|
|
|
static struct udp_seq_afinfo udp6_seq_afinfo = {
|
|
.name = "udp6",
|
|
.family = AF_INET6,
|
|
.udp_table = &udp_table,
|
|
.seq_fops = &udp6_afinfo_seq_fops,
|
|
.seq_ops = {
|
|
.show = udp6_seq_show,
|
|
},
|
|
};
|
|
|
|
int __net_init udp6_proc_init(struct net *net)
|
|
{
|
|
return udp_proc_register(net, &udp6_seq_afinfo);
|
|
}
|
|
|
|
void udp6_proc_exit(struct net *net)
|
|
{
|
|
udp_proc_unregister(net, &udp6_seq_afinfo);
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
void udp_v6_clear_sk(struct sock *sk, int size)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
/* we do not want to clear pinet6 field, because of RCU lookups */
|
|
sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6));
|
|
|
|
size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
|
|
memset(&inet->pinet6 + 1, 0, size);
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
struct proto udpv6_prot = {
|
|
.name = "UDPv6",
|
|
.owner = THIS_MODULE,
|
|
.close = udp_lib_close,
|
|
.connect = ip6_datagram_connect,
|
|
.disconnect = udp_disconnect,
|
|
.ioctl = udp_ioctl,
|
|
.destroy = udpv6_destroy_sock,
|
|
.setsockopt = udpv6_setsockopt,
|
|
.getsockopt = udpv6_getsockopt,
|
|
.sendmsg = udpv6_sendmsg,
|
|
.recvmsg = udpv6_recvmsg,
|
|
.backlog_rcv = __udpv6_queue_rcv_skb,
|
|
.hash = udp_lib_hash,
|
|
.unhash = udp_lib_unhash,
|
|
.rehash = udp_v6_rehash,
|
|
.get_port = udp_v6_get_port,
|
|
.memory_allocated = &udp_memory_allocated,
|
|
.sysctl_mem = sysctl_udp_mem,
|
|
.sysctl_wmem = &sysctl_udp_wmem_min,
|
|
.sysctl_rmem = &sysctl_udp_rmem_min,
|
|
.obj_size = sizeof(struct udp6_sock),
|
|
.slab_flags = SLAB_DESTROY_BY_RCU,
|
|
.h.udp_table = &udp_table,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_udpv6_setsockopt,
|
|
.compat_getsockopt = compat_udpv6_getsockopt,
|
|
#endif
|
|
.clear_sk = udp_v6_clear_sk,
|
|
};
|
|
|
|
static struct inet_protosw udpv6_protosw = {
|
|
.type = SOCK_DGRAM,
|
|
.protocol = IPPROTO_UDP,
|
|
.prot = &udpv6_prot,
|
|
.ops = &inet6_dgram_ops,
|
|
.flags = INET_PROTOSW_PERMANENT,
|
|
};
|
|
|
|
int __init udpv6_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = inet6_register_protosw(&udpv6_protosw);
|
|
if (ret)
|
|
goto out_udpv6_protocol;
|
|
out:
|
|
return ret;
|
|
|
|
out_udpv6_protocol:
|
|
inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
|
|
goto out;
|
|
}
|
|
|
|
void udpv6_exit(void)
|
|
{
|
|
inet6_unregister_protosw(&udpv6_protosw);
|
|
inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
|
|
}
|