856540ee31
Change udp6_portaddr_hash() to use ipv6_addr_v4mapped() inline instead of ipv6_addr_type(). Signed-off-by: Brian Haley <brian.haley@hp.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1474 lines
36 KiB
C
1474 lines
36 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 <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 <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include "udp_impl.h"
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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 *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
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const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
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__be32 sk1_rcv_saddr = inet_sk(sk)->inet_rcv_saddr;
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__be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
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int sk_ipv6only = ipv6_only_sock(sk);
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int sk2_ipv6only = inet_v6_ipv6only(sk2);
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int addr_type = ipv6_addr_type(sk_rcv_saddr6);
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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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(!sk1_rcv_saddr || !sk2_rcv_saddr ||
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sk1_rcv_saddr == sk2_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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!(sk_ipv6only && 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_rcv_saddr6, sk2_rcv_saddr6))
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return 1;
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return 0;
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}
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static unsigned int udp6_portaddr_hash(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(addr6->s6_addr32[3], mix);
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else
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hash = jhash2(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), &inet6_sk(sk)->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 inline int compute_score(struct sock *sk, struct net *net,
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unsigned short hnum,
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struct in6_addr *saddr, __be16 sport,
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struct in6_addr *daddr, __be16 dport,
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int dif)
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{
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int score = -1;
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if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
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sk->sk_family == PF_INET6) {
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct inet_sock *inet = inet_sk(sk);
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score = 0;
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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(&np->rcv_saddr)) {
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if (!ipv6_addr_equal(&np->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(&np->daddr)) {
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if (!ipv6_addr_equal(&np->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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}
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return score;
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}
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#define SCORE2_MAX (1 + 1 + 1)
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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, unsigned short hnum,
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int dif)
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{
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int score = -1;
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if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
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sk->sk_family == PF_INET6) {
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct inet_sock *inet = inet_sk(sk);
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if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
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return -1;
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score = 0;
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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(&np->daddr)) {
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if (!ipv6_addr_equal(&np->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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}
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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;
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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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if (score == SCORE2_MAX)
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goto exact_match;
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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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exact_match:
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if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
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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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static struct sock *__udp6_lib_lookup(struct net *net,
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struct in6_addr *saddr, __be16 sport,
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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;
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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, &in6addr_any, sport,
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daddr, 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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}
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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(&result->sk_refcnt)))
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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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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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struct ipv6hdr *iph = ipv6_hdr(skb);
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if (unlikely(sk = skb_steal_sock(skb)))
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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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* This should be easy, if there is something there we
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* return it, otherwise we block.
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*/
|
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|
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int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
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struct msghdr *msg, size_t len,
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int noblock, int flags, int *addr_len)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct inet_sock *inet = inet_sk(sk);
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struct sk_buff *skb;
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unsigned int ulen, copied;
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int peeked;
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int err;
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int is_udplite = IS_UDPLITE(sk);
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int is_udp4;
|
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if (addr_len)
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*addr_len=sizeof(struct sockaddr_in6);
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if (flags & MSG_ERRQUEUE)
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return ipv6_recv_error(sk, msg, len);
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try_again:
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skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
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&peeked, &err);
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if (!skb)
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goto out;
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ulen = skb->len - sizeof(struct udphdr);
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copied = len;
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if (copied > ulen)
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copied = ulen;
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else if (copied < ulen)
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msg->msg_flags |= MSG_TRUNC;
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is_udp4 = (skb->protocol == htons(ETH_P_IP));
|
|
|
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/*
|
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* If checksum is needed at all, try to do it while copying the
|
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* data. If the data is truncated, or if we only want a partial
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* coverage checksum (UDP-Lite), do it before the copy.
|
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*/
|
|
|
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if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
|
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if (udp_lib_checksum_complete(skb))
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goto csum_copy_err;
|
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}
|
|
|
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if (skb_csum_unnecessary(skb))
|
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err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
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msg->msg_iov, copied );
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else {
|
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err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
|
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if (err == -EINVAL)
|
|
goto csum_copy_err;
|
|
}
|
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if (err)
|
|
goto out_free;
|
|
|
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if (!peeked) {
|
|
if (is_udp4)
|
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UDP_INC_STATS_USER(sock_net(sk),
|
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UDP_MIB_INDATAGRAMS, is_udplite);
|
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else
|
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UDP6_INC_STATS_USER(sock_net(sk),
|
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UDP_MIB_INDATAGRAMS, is_udplite);
|
|
}
|
|
|
|
sock_recv_ts_and_drops(msg, sk, skb);
|
|
|
|
/* Copy the address. */
|
|
if (msg->msg_name) {
|
|
struct sockaddr_in6 *sin6;
|
|
|
|
sin6 = (struct sockaddr_in6 *) msg->msg_name;
|
|
sin6->sin6_family = AF_INET6;
|
|
sin6->sin6_port = udp_hdr(skb)->source;
|
|
sin6->sin6_flowinfo = 0;
|
|
sin6->sin6_scope_id = 0;
|
|
|
|
if (is_udp4)
|
|
ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
|
|
&sin6->sin6_addr);
|
|
else {
|
|
ipv6_addr_copy(&sin6->sin6_addr,
|
|
&ipv6_hdr(skb)->saddr);
|
|
if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
|
|
sin6->sin6_scope_id = IP6CB(skb)->iif;
|
|
}
|
|
|
|
}
|
|
if (is_udp4) {
|
|
if (inet->cmsg_flags)
|
|
ip_cmsg_recv(msg, skb);
|
|
} else {
|
|
if (np->rxopt.all)
|
|
datagram_recv_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:
|
|
lock_sock(sk);
|
|
if (!skb_kill_datagram(sk, skb, flags)) {
|
|
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);
|
|
}
|
|
release_sock(sk);
|
|
|
|
if (flags & MSG_DONTWAIT)
|
|
return -EAGAIN;
|
|
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;
|
|
struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
|
|
struct in6_addr *saddr = &hdr->saddr;
|
|
struct in6_addr *daddr = &hdr->daddr;
|
|
struct udphdr *uh = (struct udphdr*)(skb->data+offset);
|
|
struct sock *sk;
|
|
int err;
|
|
|
|
sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
|
|
saddr, uh->source, inet6_iif(skb), udptable);
|
|
if (sk == NULL)
|
|
return;
|
|
|
|
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 __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);
|
|
}
|
|
|
|
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;
|
|
|
|
/*
|
|
* 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 */
|
|
LIMIT_NETDEBUG(KERN_WARNING "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) {
|
|
LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
|
|
"too small, need min %d\n",
|
|
UDP_SKB_CB(skb)->cscov, up->pcrlen);
|
|
goto drop;
|
|
}
|
|
}
|
|
|
|
if (sk->sk_filter) {
|
|
if (udp_lib_checksum_complete(skb))
|
|
goto drop;
|
|
}
|
|
|
|
if ((rc = sock_queue_rcv_skb(sk, skb)) < 0) {
|
|
/* Note that an ENOMEM error is charged twice */
|
|
if (rc == -ENOMEM)
|
|
UDP6_INC_STATS_BH(sock_net(sk),
|
|
UDP_MIB_RCVBUFERRORS, is_udplite);
|
|
goto drop_no_sk_drops_inc;
|
|
}
|
|
|
|
return 0;
|
|
drop:
|
|
atomic_inc(&sk->sk_drops);
|
|
drop_no_sk_drops_inc:
|
|
UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
|
|
kfree_skb(skb);
|
|
return -1;
|
|
}
|
|
|
|
static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
|
|
__be16 loc_port, struct in6_addr *loc_addr,
|
|
__be16 rmt_port, struct in6_addr *rmt_addr,
|
|
int dif)
|
|
{
|
|
struct hlist_nulls_node *node;
|
|
struct sock *s = sk;
|
|
unsigned short num = ntohs(loc_port);
|
|
|
|
sk_nulls_for_each_from(s, node) {
|
|
struct inet_sock *inet = inet_sk(s);
|
|
|
|
if (!net_eq(sock_net(s), net))
|
|
continue;
|
|
|
|
if (udp_sk(s)->udp_port_hash == num &&
|
|
s->sk_family == PF_INET6) {
|
|
struct ipv6_pinfo *np = inet6_sk(s);
|
|
if (inet->inet_dport) {
|
|
if (inet->inet_dport != rmt_port)
|
|
continue;
|
|
}
|
|
if (!ipv6_addr_any(&np->daddr) &&
|
|
!ipv6_addr_equal(&np->daddr, rmt_addr))
|
|
continue;
|
|
|
|
if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
|
|
continue;
|
|
|
|
if (!ipv6_addr_any(&np->rcv_saddr)) {
|
|
if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
|
|
continue;
|
|
}
|
|
if (!inet6_mc_check(s, loc_addr, rmt_addr))
|
|
continue;
|
|
return s;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void flush_stack(struct sock **stack, unsigned int count,
|
|
struct sk_buff *skb, unsigned int final)
|
|
{
|
|
unsigned int i;
|
|
struct sock *sk;
|
|
struct sk_buff *skb1;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
|
|
|
|
sk = stack[i];
|
|
if (skb1) {
|
|
bh_lock_sock(sk);
|
|
if (!sock_owned_by_user(sk))
|
|
udpv6_queue_rcv_skb(sk, skb1);
|
|
else
|
|
sk_add_backlog(sk, skb1);
|
|
bh_unlock_sock(sk);
|
|
} else {
|
|
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));
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* 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,
|
|
struct in6_addr *saddr, struct in6_addr *daddr,
|
|
struct udp_table *udptable)
|
|
{
|
|
struct sock *sk, *stack[256 / sizeof(struct sock *)];
|
|
const struct udphdr *uh = udp_hdr(skb);
|
|
struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
|
|
int dif;
|
|
unsigned int i, count = 0;
|
|
|
|
spin_lock(&hslot->lock);
|
|
sk = sk_nulls_head(&hslot->head);
|
|
dif = inet6_iif(skb);
|
|
sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
|
|
while (sk) {
|
|
stack[count++] = sk;
|
|
sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
|
|
uh->source, saddr, dif);
|
|
if (unlikely(count == ARRAY_SIZE(stack))) {
|
|
if (!sk)
|
|
break;
|
|
flush_stack(stack, count, skb, ~0);
|
|
count = 0;
|
|
}
|
|
}
|
|
/*
|
|
* before releasing the lock, we must take reference on sockets
|
|
*/
|
|
for (i = 0; i < count; i++)
|
|
sock_hold(stack[i]);
|
|
|
|
spin_unlock(&hslot->lock);
|
|
|
|
if (count) {
|
|
flush_stack(stack, count, skb, count - 1);
|
|
|
|
for (i = 0; i < count; i++)
|
|
sock_put(stack[i]);
|
|
} else {
|
|
kfree_skb(skb);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
|
|
int proto)
|
|
{
|
|
int err;
|
|
|
|
UDP_SKB_CB(skb)->partial_cov = 0;
|
|
UDP_SKB_CB(skb)->cscov = skb->len;
|
|
|
|
if (proto == IPPROTO_UDPLITE) {
|
|
err = udplite_checksum_init(skb, uh);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (uh->check == 0) {
|
|
/* RFC 2460 section 8.1 says that we SHOULD log
|
|
this error. Well, it is reasonable.
|
|
*/
|
|
LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
|
|
return 1;
|
|
}
|
|
if (skb->ip_summed == CHECKSUM_COMPLETE &&
|
|
!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
|
|
skb->len, proto, skb->csum))
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
|
|
if (!skb_csum_unnecessary(skb))
|
|
skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
|
|
&ipv6_hdr(skb)->daddr,
|
|
skb->len, proto, 0));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
|
|
int proto)
|
|
{
|
|
struct sock *sk;
|
|
struct udphdr *uh;
|
|
struct net_device *dev = skb->dev;
|
|
struct in6_addr *saddr, *daddr;
|
|
u32 ulen = 0;
|
|
struct net *net = dev_net(skb->dev);
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct udphdr)))
|
|
goto short_packet;
|
|
|
|
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 discard;
|
|
|
|
/*
|
|
* Multicast receive code
|
|
*/
|
|
if (ipv6_addr_is_multicast(daddr))
|
|
return __udp6_lib_mcast_deliver(net, skb,
|
|
saddr, daddr, udptable);
|
|
|
|
/* 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 == NULL) {
|
|
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
|
|
goto discard;
|
|
|
|
if (udp_lib_checksum_complete(skb))
|
|
goto discard;
|
|
UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
|
|
proto == IPPROTO_UDPLITE);
|
|
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
|
|
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
/* deliver */
|
|
|
|
bh_lock_sock(sk);
|
|
if (!sock_owned_by_user(sk))
|
|
udpv6_queue_rcv_skb(sk, skb);
|
|
else
|
|
sk_add_backlog(sk, skb);
|
|
bh_unlock_sock(sk);
|
|
sock_put(sk);
|
|
return 0;
|
|
|
|
short_packet:
|
|
LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
|
|
proto == IPPROTO_UDPLITE ? "-Lite" : "",
|
|
ulen, skb->len);
|
|
|
|
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);
|
|
__wsum csum = 0;
|
|
|
|
if (skb_queue_len(&sk->sk_write_queue) == 1) {
|
|
/* 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;
|
|
|
|
skb_queue_walk(&sk->sk_write_queue, skb) {
|
|
csum = csum_add(csum, skb->csum);
|
|
}
|
|
|
|
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_push_pending_frames(struct sock *sk)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct udphdr *uh;
|
|
struct udp_sock *up = udp_sk(sk);
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct flowi *fl = &inet->cork.fl;
|
|
int err = 0;
|
|
int is_udplite = IS_UDPLITE(sk);
|
|
__wsum csum = 0;
|
|
|
|
/* Grab the skbuff where UDP header space exists. */
|
|
if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
|
|
goto out;
|
|
|
|
/*
|
|
* Create a UDP header
|
|
*/
|
|
uh = udp_hdr(skb);
|
|
uh->source = fl->fl_ip_sport;
|
|
uh->dest = fl->fl_ip_dport;
|
|
uh->len = htons(up->len);
|
|
uh->check = 0;
|
|
|
|
if (is_udplite)
|
|
csum = udplite_csum_outgoing(sk, skb);
|
|
else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
|
|
udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst,
|
|
up->len);
|
|
goto send;
|
|
} else
|
|
csum = udp_csum_outgoing(sk, skb);
|
|
|
|
/* add protocol-dependent pseudo-header */
|
|
uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
|
|
up->len, fl->proto, csum );
|
|
if (uh->check == 0)
|
|
uh->check = CSUM_MANGLED_0;
|
|
|
|
send:
|
|
err = ip6_push_pending_frames(sk);
|
|
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);
|
|
out:
|
|
up->len = 0;
|
|
up->pending = 0;
|
|
return err;
|
|
}
|
|
|
|
int udpv6_sendmsg(struct kiocb *iocb, 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);
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
|
|
struct in6_addr *daddr, *final_p = NULL, final;
|
|
struct ipv6_txoptions *opt = NULL;
|
|
struct ip6_flowlabel *flowlabel = NULL;
|
|
struct flowi fl;
|
|
struct dst_entry *dst;
|
|
int addr_len = msg->msg_namelen;
|
|
int ulen = len;
|
|
int hlimit = -1;
|
|
int tclass = -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 = &np->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(iocb, sk, msg, len);
|
|
}
|
|
}
|
|
|
|
if (up->pending == AF_INET)
|
|
return udp_sendmsg(iocb, 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;
|
|
|
|
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(&fl, 0, sizeof(fl));
|
|
|
|
if (sin6) {
|
|
if (sin6->sin6_port == 0)
|
|
return -EINVAL;
|
|
|
|
fl.fl_ip_dport = sin6->sin6_port;
|
|
daddr = &sin6->sin6_addr;
|
|
|
|
if (np->sndflow) {
|
|
fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
|
|
if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
|
|
flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
|
|
if (flowlabel == NULL)
|
|
return -EINVAL;
|
|
daddr = &flowlabel->dst;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Otherwise it will be difficult to maintain
|
|
* sk->sk_dst_cache.
|
|
*/
|
|
if (sk->sk_state == TCP_ESTABLISHED &&
|
|
ipv6_addr_equal(daddr, &np->daddr))
|
|
daddr = &np->daddr;
|
|
|
|
if (addr_len >= sizeof(struct sockaddr_in6) &&
|
|
sin6->sin6_scope_id &&
|
|
ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
|
|
fl.oif = sin6->sin6_scope_id;
|
|
} else {
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
return -EDESTADDRREQ;
|
|
|
|
fl.fl_ip_dport = inet->inet_dport;
|
|
daddr = &np->daddr;
|
|
fl.fl6_flowlabel = np->flow_label;
|
|
connected = 1;
|
|
}
|
|
|
|
if (!fl.oif)
|
|
fl.oif = sk->sk_bound_dev_if;
|
|
|
|
if (!fl.oif)
|
|
fl.oif = np->sticky_pktinfo.ipi6_ifindex;
|
|
|
|
fl.mark = sk->sk_mark;
|
|
|
|
if (msg->msg_controllen) {
|
|
opt = &opt_space;
|
|
memset(opt, 0, sizeof(struct ipv6_txoptions));
|
|
opt->tot_len = sizeof(*opt);
|
|
|
|
err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
|
|
if (err < 0) {
|
|
fl6_sock_release(flowlabel);
|
|
return err;
|
|
}
|
|
if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
|
|
flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
|
|
if (flowlabel == NULL)
|
|
return -EINVAL;
|
|
}
|
|
if (!(opt->opt_nflen|opt->opt_flen))
|
|
opt = NULL;
|
|
connected = 0;
|
|
}
|
|
if (opt == NULL)
|
|
opt = np->opt;
|
|
if (flowlabel)
|
|
opt = fl6_merge_options(&opt_space, flowlabel, opt);
|
|
opt = ipv6_fixup_options(&opt_space, opt);
|
|
|
|
fl.proto = sk->sk_protocol;
|
|
if (!ipv6_addr_any(daddr))
|
|
ipv6_addr_copy(&fl.fl6_dst, daddr);
|
|
else
|
|
fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
|
|
if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
|
|
ipv6_addr_copy(&fl.fl6_src, &np->saddr);
|
|
fl.fl_ip_sport = inet->inet_sport;
|
|
|
|
/* merge ip6_build_xmit from ip6_output */
|
|
if (opt && opt->srcrt) {
|
|
struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
|
|
ipv6_addr_copy(&final, &fl.fl6_dst);
|
|
ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
|
|
final_p = &final;
|
|
connected = 0;
|
|
}
|
|
|
|
if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
|
|
fl.oif = np->mcast_oif;
|
|
connected = 0;
|
|
}
|
|
|
|
security_sk_classify_flow(sk, &fl);
|
|
|
|
err = ip6_sk_dst_lookup(sk, &dst, &fl);
|
|
if (err)
|
|
goto out;
|
|
if (final_p)
|
|
ipv6_addr_copy(&fl.fl6_dst, final_p);
|
|
|
|
err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
|
|
if (err < 0) {
|
|
if (err == -EREMOTE)
|
|
err = ip6_dst_blackhole(sk, &dst, &fl);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
if (hlimit < 0) {
|
|
if (ipv6_addr_is_multicast(&fl.fl6_dst))
|
|
hlimit = np->mcast_hops;
|
|
else
|
|
hlimit = np->hop_limit;
|
|
if (hlimit < 0)
|
|
hlimit = ip6_dst_hoplimit(dst);
|
|
}
|
|
|
|
if (tclass < 0)
|
|
tclass = np->tclass;
|
|
|
|
if (msg->msg_flags&MSG_CONFIRM)
|
|
goto do_confirm;
|
|
back_from_confirm:
|
|
|
|
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);
|
|
|
|
LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
up->pending = AF_INET6;
|
|
|
|
do_append_data:
|
|
up->len += ulen;
|
|
getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
|
|
err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
|
|
sizeof(struct udphdr), hlimit, tclass, opt, &fl,
|
|
(struct rt6_info*)dst,
|
|
corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
|
|
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 (dst) {
|
|
if (connected) {
|
|
ip6_dst_store(sk, dst,
|
|
ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
|
|
&np->daddr : NULL,
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
|
|
&np->saddr :
|
|
#endif
|
|
NULL);
|
|
} else {
|
|
dst_release(dst);
|
|
}
|
|
dst = NULL;
|
|
}
|
|
|
|
if (err > 0)
|
|
err = np->recverr ? net_xmit_errno(err) : 0;
|
|
release_sock(sk);
|
|
out:
|
|
dst_release(dst);
|
|
fl6_sock_release(flowlabel);
|
|
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)
|
|
{
|
|
lock_sock(sk);
|
|
udp_v6_flush_pending_frames(sk);
|
|
release_sock(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 int udp6_ufo_send_check(struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *ipv6h;
|
|
struct udphdr *uh;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*uh)))
|
|
return -EINVAL;
|
|
|
|
ipv6h = ipv6_hdr(skb);
|
|
uh = udp_hdr(skb);
|
|
|
|
uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
|
|
IPPROTO_UDP, 0);
|
|
skb->csum_start = skb_transport_header(skb) - skb->head;
|
|
skb->csum_offset = offsetof(struct udphdr, check);
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
return 0;
|
|
}
|
|
|
|
static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features)
|
|
{
|
|
struct sk_buff *segs = ERR_PTR(-EINVAL);
|
|
unsigned int mss;
|
|
unsigned int unfrag_ip6hlen, unfrag_len;
|
|
struct frag_hdr *fptr;
|
|
u8 *mac_start, *prevhdr;
|
|
u8 nexthdr;
|
|
u8 frag_hdr_sz = sizeof(struct frag_hdr);
|
|
int offset;
|
|
__wsum csum;
|
|
|
|
mss = skb_shinfo(skb)->gso_size;
|
|
if (unlikely(skb->len <= mss))
|
|
goto out;
|
|
|
|
if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
|
|
/* Packet is from an untrusted source, reset gso_segs. */
|
|
int type = skb_shinfo(skb)->gso_type;
|
|
|
|
if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
|
|
!(type & (SKB_GSO_UDP))))
|
|
goto out;
|
|
|
|
skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
|
|
|
|
segs = NULL;
|
|
goto out;
|
|
}
|
|
|
|
/* Do software UFO. Complete and fill in the UDP checksum as HW cannot
|
|
* do checksum of UDP packets sent as multiple IP fragments.
|
|
*/
|
|
offset = skb->csum_start - skb_headroom(skb);
|
|
csum = skb_checksum(skb, offset, skb->len- offset, 0);
|
|
offset += skb->csum_offset;
|
|
*(__sum16 *)(skb->data + offset) = csum_fold(csum);
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
/* Check if there is enough headroom to insert fragment header. */
|
|
if ((skb_headroom(skb) < frag_hdr_sz) &&
|
|
pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
|
|
goto out;
|
|
|
|
/* Find the unfragmentable header and shift it left by frag_hdr_sz
|
|
* bytes to insert fragment header.
|
|
*/
|
|
unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
|
|
nexthdr = *prevhdr;
|
|
*prevhdr = NEXTHDR_FRAGMENT;
|
|
unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
|
|
unfrag_ip6hlen;
|
|
mac_start = skb_mac_header(skb);
|
|
memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
|
|
|
|
skb->mac_header -= frag_hdr_sz;
|
|
skb->network_header -= frag_hdr_sz;
|
|
|
|
fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
|
|
fptr->nexthdr = nexthdr;
|
|
fptr->reserved = 0;
|
|
ipv6_select_ident(fptr);
|
|
|
|
/* Fragment the skb. ipv6 header and the remaining fields of the
|
|
* fragment header are updated in ipv6_gso_segment()
|
|
*/
|
|
segs = skb_segment(skb, features);
|
|
|
|
out:
|
|
return segs;
|
|
}
|
|
|
|
static const struct inet6_protocol udpv6_protocol = {
|
|
.handler = udpv6_rcv,
|
|
.err_handler = udpv6_err,
|
|
.gso_send_check = udp6_ufo_send_check,
|
|
.gso_segment = udp6_ufo_fragment,
|
|
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
|
|
};
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sp);
|
|
struct ipv6_pinfo *np = inet6_sk(sp);
|
|
struct in6_addr *dest, *src;
|
|
__u16 destp, srcp;
|
|
|
|
dest = &np->daddr;
|
|
src = &np->rcv_saddr;
|
|
destp = ntohs(inet->inet_dport);
|
|
srcp = ntohs(inet->inet_sport);
|
|
seq_printf(seq,
|
|
"%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
|
|
"%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %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,
|
|
sock_i_uid(sp), 0,
|
|
sock_i_ino(sp),
|
|
atomic_read(&sp->sk_refcnt), sp,
|
|
atomic_read(&sp->sk_drops));
|
|
}
|
|
|
|
int udp6_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_printf(seq,
|
|
" sl "
|
|
"local_address "
|
|
"remote_address "
|
|
"st tx_queue rx_queue tr tm->when retrnsmt"
|
|
" uid timeout inode ref pointer drops\n");
|
|
else
|
|
udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
|
|
return 0;
|
|
}
|
|
|
|
static struct udp_seq_afinfo udp6_seq_afinfo = {
|
|
.name = "udp6",
|
|
.family = AF_INET6,
|
|
.udp_table = &udp_table,
|
|
.seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.seq_ops = {
|
|
.show = udp6_seq_show,
|
|
},
|
|
};
|
|
|
|
int 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 */
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
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,
|
|
.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
|
|
};
|
|
|
|
static struct inet_protosw udpv6_protosw = {
|
|
.type = SOCK_DGRAM,
|
|
.protocol = IPPROTO_UDP,
|
|
.prot = &udpv6_prot,
|
|
.ops = &inet6_dgram_ops,
|
|
.no_check = UDP_CSUM_DEFAULT,
|
|
.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);
|
|
}
|