27a884dc3c
So that it is also an offset from skb->head, reduces its size from 8 to 4 bytes
on 64bit architectures, allowing us to combine the 4 bytes hole left by the
layer headers conversion, reducing struct sk_buff size to 256 bytes, i.e. 4
64byte cachelines, and since the sk_buff slab cache is SLAB_HWCACHE_ALIGN...
:-)
Many calculations that previously required that skb->{transport,network,
mac}_header be first converted to a pointer now can be done directly, being
meaningful as offsets or pointers.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
732 lines
17 KiB
C
732 lines
17 KiB
C
/*
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* common UDP/RAW code
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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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* $Id: datagram.c,v 1.24 2002/02/01 22:01:04 davem Exp $
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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/capability.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in6.h>
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#include <linux/ipv6.h>
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#include <linux/route.h>
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#include <net/ipv6.h>
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#include <net/ndisc.h>
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#include <net/addrconf.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/tcp_states.h>
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#include <linux/errqueue.h>
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#include <asm/uaccess.h>
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int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
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{
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struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
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struct inet_sock *inet = inet_sk(sk);
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct in6_addr *daddr, *final_p = NULL, final;
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struct dst_entry *dst;
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struct flowi fl;
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struct ip6_flowlabel *flowlabel = NULL;
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int addr_type;
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int err;
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if (usin->sin6_family == AF_INET) {
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if (__ipv6_only_sock(sk))
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return -EAFNOSUPPORT;
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err = ip4_datagram_connect(sk, uaddr, addr_len);
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goto ipv4_connected;
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}
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if (addr_len < SIN6_LEN_RFC2133)
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return -EINVAL;
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if (usin->sin6_family != AF_INET6)
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return -EAFNOSUPPORT;
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memset(&fl, 0, sizeof(fl));
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if (np->sndflow) {
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fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
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if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
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flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
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if (flowlabel == NULL)
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return -EINVAL;
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ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
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}
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}
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addr_type = ipv6_addr_type(&usin->sin6_addr);
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if (addr_type == IPV6_ADDR_ANY) {
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/*
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* connect to self
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*/
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usin->sin6_addr.s6_addr[15] = 0x01;
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}
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daddr = &usin->sin6_addr;
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if (addr_type == IPV6_ADDR_MAPPED) {
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struct sockaddr_in sin;
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if (__ipv6_only_sock(sk)) {
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err = -ENETUNREACH;
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goto out;
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}
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = daddr->s6_addr32[3];
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sin.sin_port = usin->sin6_port;
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err = ip4_datagram_connect(sk,
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(struct sockaddr*) &sin,
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sizeof(sin));
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ipv4_connected:
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if (err)
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goto out;
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ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
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if (ipv6_addr_any(&np->saddr)) {
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ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
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inet->saddr);
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}
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if (ipv6_addr_any(&np->rcv_saddr)) {
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ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
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inet->rcv_saddr);
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}
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goto out;
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}
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if (addr_type&IPV6_ADDR_LINKLOCAL) {
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if (addr_len >= sizeof(struct sockaddr_in6) &&
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usin->sin6_scope_id) {
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if (sk->sk_bound_dev_if &&
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sk->sk_bound_dev_if != usin->sin6_scope_id) {
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err = -EINVAL;
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goto out;
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}
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sk->sk_bound_dev_if = usin->sin6_scope_id;
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if (!sk->sk_bound_dev_if &&
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(addr_type & IPV6_ADDR_MULTICAST))
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fl.oif = np->mcast_oif;
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}
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/* Connect to link-local address requires an interface */
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if (!sk->sk_bound_dev_if) {
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err = -EINVAL;
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goto out;
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}
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}
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ipv6_addr_copy(&np->daddr, daddr);
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np->flow_label = fl.fl6_flowlabel;
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inet->dport = usin->sin6_port;
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/*
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* Check for a route to destination an obtain the
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* destination cache for it.
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*/
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fl.proto = sk->sk_protocol;
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ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
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ipv6_addr_copy(&fl.fl6_src, &np->saddr);
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fl.oif = sk->sk_bound_dev_if;
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fl.fl_ip_dport = inet->dport;
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fl.fl_ip_sport = inet->sport;
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if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
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fl.oif = np->mcast_oif;
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security_sk_classify_flow(sk, &fl);
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if (flowlabel) {
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if (flowlabel->opt && flowlabel->opt->srcrt) {
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struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
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ipv6_addr_copy(&final, &fl.fl6_dst);
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ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
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final_p = &final;
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}
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} else if (np->opt && np->opt->srcrt) {
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struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
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ipv6_addr_copy(&final, &fl.fl6_dst);
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ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
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final_p = &final;
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}
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err = ip6_dst_lookup(sk, &dst, &fl);
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if (err)
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goto out;
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if (final_p)
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ipv6_addr_copy(&fl.fl6_dst, final_p);
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if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
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goto out;
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/* source address lookup done in ip6_dst_lookup */
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if (ipv6_addr_any(&np->saddr))
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ipv6_addr_copy(&np->saddr, &fl.fl6_src);
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if (ipv6_addr_any(&np->rcv_saddr)) {
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ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
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inet->rcv_saddr = LOOPBACK4_IPV6;
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}
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ip6_dst_store(sk, dst,
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ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
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&np->daddr : NULL,
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#ifdef CONFIG_IPV6_SUBTREES
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ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
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&np->saddr :
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#endif
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NULL);
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sk->sk_state = TCP_ESTABLISHED;
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out:
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fl6_sock_release(flowlabel);
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return err;
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}
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void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
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__be16 port, u32 info, u8 *payload)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct icmp6hdr *icmph = icmp6_hdr(skb);
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struct sock_exterr_skb *serr;
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if (!np->recverr)
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return;
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skb = skb_clone(skb, GFP_ATOMIC);
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if (!skb)
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return;
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serr = SKB_EXT_ERR(skb);
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serr->ee.ee_errno = err;
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serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
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serr->ee.ee_type = icmph->icmp6_type;
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serr->ee.ee_code = icmph->icmp6_code;
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serr->ee.ee_pad = 0;
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serr->ee.ee_info = info;
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serr->ee.ee_data = 0;
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serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
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skb_network_header(skb);
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serr->port = port;
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__skb_pull(skb, payload - skb->data);
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skb_reset_transport_header(skb);
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if (sock_queue_err_skb(sk, skb))
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kfree_skb(skb);
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}
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void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct sock_exterr_skb *serr;
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struct ipv6hdr *iph;
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struct sk_buff *skb;
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if (!np->recverr)
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return;
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skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
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if (!skb)
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return;
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skb_put(skb, sizeof(struct ipv6hdr));
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skb_reset_network_header(skb);
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iph = ipv6_hdr(skb);
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ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
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serr = SKB_EXT_ERR(skb);
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serr->ee.ee_errno = err;
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serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
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serr->ee.ee_type = 0;
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serr->ee.ee_code = 0;
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serr->ee.ee_pad = 0;
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serr->ee.ee_info = info;
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serr->ee.ee_data = 0;
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serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
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serr->port = fl->fl_ip_dport;
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__skb_pull(skb, skb_tail_pointer(skb) - skb->data);
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skb_reset_transport_header(skb);
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if (sock_queue_err_skb(sk, skb))
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kfree_skb(skb);
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}
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/*
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* Handle MSG_ERRQUEUE
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*/
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int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct sock_exterr_skb *serr;
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struct sk_buff *skb, *skb2;
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struct sockaddr_in6 *sin;
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struct {
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struct sock_extended_err ee;
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struct sockaddr_in6 offender;
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} errhdr;
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int err;
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int copied;
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err = -EAGAIN;
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skb = skb_dequeue(&sk->sk_error_queue);
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if (skb == NULL)
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goto out;
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copied = skb->len;
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if (copied > len) {
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msg->msg_flags |= MSG_TRUNC;
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copied = len;
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}
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err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
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if (err)
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goto out_free_skb;
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sock_recv_timestamp(msg, sk, skb);
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serr = SKB_EXT_ERR(skb);
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sin = (struct sockaddr_in6 *)msg->msg_name;
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if (sin) {
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const unsigned char *nh = skb_network_header(skb);
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sin->sin6_family = AF_INET6;
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sin->sin6_flowinfo = 0;
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sin->sin6_port = serr->port;
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sin->sin6_scope_id = 0;
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if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
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ipv6_addr_copy(&sin->sin6_addr,
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(struct in6_addr *)(nh + serr->addr_offset));
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if (np->sndflow)
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sin->sin6_flowinfo =
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(*(__be32 *)(nh + serr->addr_offset - 24) &
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IPV6_FLOWINFO_MASK);
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if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
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sin->sin6_scope_id = IP6CB(skb)->iif;
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} else {
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ipv6_addr_set(&sin->sin6_addr, 0, 0,
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htonl(0xffff),
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*(__be32 *)(nh + serr->addr_offset));
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}
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}
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memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
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sin = &errhdr.offender;
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sin->sin6_family = AF_UNSPEC;
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if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
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sin->sin6_family = AF_INET6;
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sin->sin6_flowinfo = 0;
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sin->sin6_scope_id = 0;
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if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
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ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
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if (np->rxopt.all)
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datagram_recv_ctl(sk, msg, skb);
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if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
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sin->sin6_scope_id = IP6CB(skb)->iif;
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} else {
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struct inet_sock *inet = inet_sk(sk);
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ipv6_addr_set(&sin->sin6_addr, 0, 0,
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htonl(0xffff), ip_hdr(skb)->saddr);
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if (inet->cmsg_flags)
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ip_cmsg_recv(msg, skb);
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}
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}
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put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
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/* Now we could try to dump offended packet options */
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msg->msg_flags |= MSG_ERRQUEUE;
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err = copied;
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/* Reset and regenerate socket error */
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spin_lock_bh(&sk->sk_error_queue.lock);
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sk->sk_err = 0;
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if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
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sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
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spin_unlock_bh(&sk->sk_error_queue.lock);
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sk->sk_error_report(sk);
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} else {
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spin_unlock_bh(&sk->sk_error_queue.lock);
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}
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out_free_skb:
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kfree_skb(skb);
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out:
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return err;
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}
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int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct inet6_skb_parm *opt = IP6CB(skb);
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unsigned char *nh = skb_network_header(skb);
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if (np->rxopt.bits.rxinfo) {
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struct in6_pktinfo src_info;
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src_info.ipi6_ifindex = opt->iif;
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ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
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put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
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}
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if (np->rxopt.bits.rxhlim) {
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int hlim = ipv6_hdr(skb)->hop_limit;
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put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
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}
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if (np->rxopt.bits.rxtclass) {
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int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
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put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
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}
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if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
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__be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
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put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
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}
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/* HbH is allowed only once */
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if (np->rxopt.bits.hopopts && opt->hop) {
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u8 *ptr = nh + opt->hop;
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put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
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}
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if (opt->lastopt &&
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(np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
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/*
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* Silly enough, but we need to reparse in order to
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* report extension headers (except for HbH)
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* in order.
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*
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* Also note that IPV6_RECVRTHDRDSTOPTS is NOT
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* (and WILL NOT be) defined because
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* IPV6_RECVDSTOPTS is more generic. --yoshfuji
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*/
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unsigned int off = sizeof(struct ipv6hdr);
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u8 nexthdr = ipv6_hdr(skb)->nexthdr;
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while (off <= opt->lastopt) {
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unsigned len;
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u8 *ptr = nh + off;
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switch(nexthdr) {
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case IPPROTO_DSTOPTS:
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nexthdr = ptr[0];
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len = (ptr[1] + 1) << 3;
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if (np->rxopt.bits.dstopts)
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put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
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break;
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case IPPROTO_ROUTING:
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nexthdr = ptr[0];
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len = (ptr[1] + 1) << 3;
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if (np->rxopt.bits.srcrt)
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put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
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break;
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case IPPROTO_AH:
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nexthdr = ptr[0];
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len = (ptr[1] + 2) << 2;
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break;
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default:
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nexthdr = ptr[0];
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len = (ptr[1] + 1) << 3;
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break;
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}
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off += len;
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}
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}
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|
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/* socket options in old style */
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if (np->rxopt.bits.rxoinfo) {
|
|
struct in6_pktinfo src_info;
|
|
|
|
src_info.ipi6_ifindex = opt->iif;
|
|
ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
|
|
put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
|
|
}
|
|
if (np->rxopt.bits.rxohlim) {
|
|
int hlim = ipv6_hdr(skb)->hop_limit;
|
|
put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
|
|
}
|
|
if (np->rxopt.bits.ohopopts && opt->hop) {
|
|
u8 *ptr = nh + opt->hop;
|
|
put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
|
|
}
|
|
if (np->rxopt.bits.odstopts && opt->dst0) {
|
|
u8 *ptr = nh + opt->dst0;
|
|
put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
|
|
}
|
|
if (np->rxopt.bits.osrcrt && opt->srcrt) {
|
|
struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
|
|
put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
|
|
}
|
|
if (np->rxopt.bits.odstopts && opt->dst1) {
|
|
u8 *ptr = nh + opt->dst1;
|
|
put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
|
|
struct ipv6_txoptions *opt,
|
|
int *hlimit, int *tclass)
|
|
{
|
|
struct in6_pktinfo *src_info;
|
|
struct cmsghdr *cmsg;
|
|
struct ipv6_rt_hdr *rthdr;
|
|
struct ipv6_opt_hdr *hdr;
|
|
int len;
|
|
int err = 0;
|
|
|
|
for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
|
|
int addr_type;
|
|
struct net_device *dev = NULL;
|
|
|
|
if (!CMSG_OK(msg, cmsg)) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
|
|
if (cmsg->cmsg_level != SOL_IPV6)
|
|
continue;
|
|
|
|
switch (cmsg->cmsg_type) {
|
|
case IPV6_PKTINFO:
|
|
case IPV6_2292PKTINFO:
|
|
if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
|
|
src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
|
|
|
|
if (src_info->ipi6_ifindex) {
|
|
if (fl->oif && src_info->ipi6_ifindex != fl->oif)
|
|
return -EINVAL;
|
|
fl->oif = src_info->ipi6_ifindex;
|
|
}
|
|
|
|
addr_type = ipv6_addr_type(&src_info->ipi6_addr);
|
|
|
|
if (addr_type == IPV6_ADDR_ANY)
|
|
break;
|
|
|
|
if (addr_type & IPV6_ADDR_LINKLOCAL) {
|
|
if (!src_info->ipi6_ifindex)
|
|
return -EINVAL;
|
|
else {
|
|
dev = dev_get_by_index(src_info->ipi6_ifindex);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
|
|
if (dev)
|
|
dev_put(dev);
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
if (dev)
|
|
dev_put(dev);
|
|
|
|
ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
|
|
break;
|
|
|
|
case IPV6_FLOWINFO:
|
|
if (cmsg->cmsg_len < CMSG_LEN(4)) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
|
|
if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
|
|
if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
}
|
|
fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
|
|
break;
|
|
|
|
case IPV6_2292HOPOPTS:
|
|
case IPV6_HOPOPTS:
|
|
if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
|
|
hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
|
|
len = ((hdr->hdrlen + 1) << 3);
|
|
if (cmsg->cmsg_len < CMSG_LEN(len)) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
if (!capable(CAP_NET_RAW)) {
|
|
err = -EPERM;
|
|
goto exit_f;
|
|
}
|
|
opt->opt_nflen += len;
|
|
opt->hopopt = hdr;
|
|
break;
|
|
|
|
case IPV6_2292DSTOPTS:
|
|
if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
|
|
hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
|
|
len = ((hdr->hdrlen + 1) << 3);
|
|
if (cmsg->cmsg_len < CMSG_LEN(len)) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
if (!capable(CAP_NET_RAW)) {
|
|
err = -EPERM;
|
|
goto exit_f;
|
|
}
|
|
if (opt->dst1opt) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
opt->opt_flen += len;
|
|
opt->dst1opt = hdr;
|
|
break;
|
|
|
|
case IPV6_DSTOPTS:
|
|
case IPV6_RTHDRDSTOPTS:
|
|
if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
|
|
hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
|
|
len = ((hdr->hdrlen + 1) << 3);
|
|
if (cmsg->cmsg_len < CMSG_LEN(len)) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
if (!capable(CAP_NET_RAW)) {
|
|
err = -EPERM;
|
|
goto exit_f;
|
|
}
|
|
if (cmsg->cmsg_type == IPV6_DSTOPTS) {
|
|
opt->opt_flen += len;
|
|
opt->dst1opt = hdr;
|
|
} else {
|
|
opt->opt_nflen += len;
|
|
opt->dst0opt = hdr;
|
|
}
|
|
break;
|
|
|
|
case IPV6_2292RTHDR:
|
|
case IPV6_RTHDR:
|
|
if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
|
|
rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
|
|
|
|
switch (rthdr->type) {
|
|
case IPV6_SRCRT_TYPE_0:
|
|
#ifdef CONFIG_IPV6_MIP6
|
|
case IPV6_SRCRT_TYPE_2:
|
|
#endif
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
|
|
len = ((rthdr->hdrlen + 1) << 3);
|
|
|
|
if (cmsg->cmsg_len < CMSG_LEN(len)) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
|
|
/* segments left must also match */
|
|
if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
|
|
opt->opt_nflen += len;
|
|
opt->srcrt = rthdr;
|
|
|
|
if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
|
|
int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
|
|
|
|
opt->opt_nflen += dsthdrlen;
|
|
opt->dst0opt = opt->dst1opt;
|
|
opt->dst1opt = NULL;
|
|
opt->opt_flen -= dsthdrlen;
|
|
}
|
|
|
|
break;
|
|
|
|
case IPV6_2292HOPLIMIT:
|
|
case IPV6_HOPLIMIT:
|
|
if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
|
|
err = -EINVAL;
|
|
goto exit_f;
|
|
}
|
|
|
|
*hlimit = *(int *)CMSG_DATA(cmsg);
|
|
break;
|
|
|
|
case IPV6_TCLASS:
|
|
{
|
|
int tc;
|
|
|
|
err = -EINVAL;
|
|
if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
|
|
goto exit_f;
|
|
}
|
|
|
|
tc = *(int *)CMSG_DATA(cmsg);
|
|
if (tc < -1 || tc > 0xff)
|
|
goto exit_f;
|
|
|
|
err = 0;
|
|
*tclass = tc;
|
|
|
|
break;
|
|
}
|
|
default:
|
|
LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
|
|
cmsg->cmsg_type);
|
|
err = -EINVAL;
|
|
break;
|
|
};
|
|
}
|
|
|
|
exit_f:
|
|
return err;
|
|
}
|