| 1 |
1275 |
phoenix |
/*
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* Neighbour Discovery for 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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* Mike Shaver <shaver@ingenia.com>
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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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/*
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* Changes:
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*
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* Lars Fenneberg : fixed MTU setting on receipt
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* of an RA.
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*
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* Janos Farkas : kmalloc failure checks
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* Alexey Kuznetsov : state machine reworked
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* and moved to net/core.
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* Pekka Savola : RFC2461 validation
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* YOSHIFUJI Hideaki @USAGI : Verify ND options properly
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*/
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/* Set to 3 to get tracing... */
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#define ND_DEBUG 1
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| 31 |
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#define ND_PRINTK(x...) printk(KERN_DEBUG x)
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#define ND_NOPRINTK(x...) do { ; } while(0)
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#define ND_PRINTK0 ND_PRINTK
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#define ND_PRINTK1 ND_NOPRINTK
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#define ND_PRINTK2 ND_NOPRINTK
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#if ND_DEBUG >= 1
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#undef ND_PRINTK1
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#define ND_PRINTK1 ND_PRINTK
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#endif
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#if ND_DEBUG >= 2
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#undef ND_PRINTK2
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#define ND_PRINTK2 ND_PRINTK
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#endif
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#include <linux/module.h>
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#include <linux/config.h>
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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/sched.h>
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#include <linux/net.h>
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#include <linux/in6.h>
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#include <linux/route.h>
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#include <linux/init.h>
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#ifdef CONFIG_SYSCTL
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#include <linux/sysctl.h>
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#endif
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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 <net/sock.h>
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#include <net/snmp.h>
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#include <net/ipv6.h>
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#include <net/protocol.h>
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#include <net/ndisc.h>
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#include <net/ip6_route.h>
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#include <net/addrconf.h>
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#include <net/icmp.h>
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#include <net/checksum.h>
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#include <linux/proc_fs.h>
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static struct socket *ndisc_socket;
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static u32 ndisc_hash(const void *pkey, const struct net_device *dev);
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static int ndisc_constructor(struct neighbour *neigh);
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static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
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static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
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static int pndisc_constructor(struct pneigh_entry *n);
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static void pndisc_destructor(struct pneigh_entry *n);
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static void pndisc_redo(struct sk_buff *skb);
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static struct neigh_ops ndisc_generic_ops =
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{
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AF_INET6,
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NULL,
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ndisc_solicit,
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ndisc_error_report,
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neigh_resolve_output,
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neigh_connected_output,
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dev_queue_xmit,
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dev_queue_xmit
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};
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static struct neigh_ops ndisc_hh_ops =
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{
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AF_INET6,
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NULL,
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ndisc_solicit,
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ndisc_error_report,
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neigh_resolve_output,
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neigh_resolve_output,
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dev_queue_xmit,
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dev_queue_xmit
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};
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| 111 |
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static struct neigh_ops ndisc_direct_ops =
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{
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AF_INET6,
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NULL,
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NULL,
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NULL,
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dev_queue_xmit,
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dev_queue_xmit,
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dev_queue_xmit,
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dev_queue_xmit
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};
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| 123 |
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struct neigh_table nd_tbl =
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{
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NULL,
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AF_INET6,
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sizeof(struct neighbour) + sizeof(struct in6_addr),
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sizeof(struct in6_addr),
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ndisc_hash,
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ndisc_constructor,
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pndisc_constructor,
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pndisc_destructor,
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pndisc_redo,
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"ndisc_cache",
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{ NULL, NULL, &nd_tbl, 0, NULL, NULL,
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30*HZ, 1*HZ, 60*HZ, 30*HZ, 5*HZ, 3, 3, 0, 3, 1*HZ, (8*HZ)/10, 64, 0 },
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30*HZ, 128, 512, 1024,
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};
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| 140 |
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| 141 |
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#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
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| 143 |
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static u8 *ndisc_fill_option(u8 *opt, int type, void *data, int data_len)
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| 144 |
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{
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| 145 |
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int space = NDISC_OPT_SPACE(data_len);
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| 146 |
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| 147 |
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opt[0] = type;
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opt[1] = space>>3;
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memcpy(opt+2, data, data_len);
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data_len += 2;
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| 151 |
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opt += data_len;
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| 152 |
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if ((space -= data_len) > 0)
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| 153 |
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memset(opt, 0, space);
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| 154 |
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return opt + space;
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| 155 |
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}
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| 156 |
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| 157 |
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struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
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| 158 |
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struct nd_opt_hdr *end)
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| 159 |
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{
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| 160 |
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int type;
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| 161 |
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if (!cur || !end || cur >= end)
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| 162 |
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return NULL;
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| 163 |
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type = cur->nd_opt_type;
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| 164 |
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do {
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| 165 |
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cur = ((void *)cur) + (cur->nd_opt_len << 3);
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| 166 |
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} while(cur < end && cur->nd_opt_type != type);
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return (cur <= end && cur->nd_opt_type == type ? cur : NULL);
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| 168 |
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}
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| 169 |
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| 170 |
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struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
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| 171 |
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struct ndisc_options *ndopts)
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| 172 |
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{
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| 173 |
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struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
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| 174 |
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| 175 |
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if (!nd_opt || opt_len < 0 || !ndopts)
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| 176 |
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return NULL;
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| 177 |
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memset(ndopts, 0, sizeof(*ndopts));
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| 178 |
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while (opt_len) {
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| 179 |
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int l;
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| 180 |
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if (opt_len < sizeof(struct nd_opt_hdr))
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| 181 |
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return NULL;
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| 182 |
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l = nd_opt->nd_opt_len << 3;
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| 183 |
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if (opt_len < l || l == 0)
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| 184 |
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return NULL;
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| 185 |
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switch (nd_opt->nd_opt_type) {
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| 186 |
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case ND_OPT_SOURCE_LL_ADDR:
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| 187 |
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case ND_OPT_TARGET_LL_ADDR:
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| 188 |
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case ND_OPT_MTU:
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| 189 |
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case ND_OPT_REDIRECT_HDR:
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| 190 |
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if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
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| 191 |
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ND_PRINTK2((KERN_WARNING
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| 192 |
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"ndisc_parse_options(): duplicated ND6 option found: type=%d\n",
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| 193 |
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nd_opt->nd_opt_type));
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| 194 |
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} else {
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| 195 |
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ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
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| 196 |
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}
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| 197 |
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break;
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| 198 |
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case ND_OPT_PREFIX_INFO:
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| 199 |
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ndopts->nd_opts_pi_end = nd_opt;
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| 200 |
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if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0)
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| 201 |
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ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
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| 202 |
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break;
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| 203 |
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default:
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| 204 |
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/*
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| 205 |
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* Unknown options must be silently ignored,
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| 206 |
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* to accomodate future extension to the protocol.
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| 207 |
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*/
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| 208 |
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ND_PRINTK2(KERN_WARNING
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| 209 |
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"ndisc_parse_options(): ignored unsupported option; type=%d, len=%d\n",
|
| 210 |
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nd_opt->nd_opt_type, nd_opt->nd_opt_len);
|
| 211 |
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}
|
| 212 |
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opt_len -= l;
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| 213 |
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nd_opt = ((void *)nd_opt) + l;
|
| 214 |
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}
|
| 215 |
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return ndopts;
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| 216 |
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}
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| 217 |
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| 218 |
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int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
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| 219 |
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{
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| 220 |
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switch (dev->type) {
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| 221 |
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case ARPHRD_ETHER:
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| 222 |
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case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */
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| 223 |
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case ARPHRD_FDDI:
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| 224 |
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ipv6_eth_mc_map(addr, buf);
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| 225 |
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return 0;
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| 226 |
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case ARPHRD_IEEE802_TR:
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| 227 |
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ipv6_tr_mc_map(addr,buf);
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| 228 |
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return 0;
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| 229 |
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case ARPHRD_ARCNET:
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| 230 |
|
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ipv6_arcnet_mc_map(addr, buf);
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| 231 |
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return 0;
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| 232 |
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default:
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| 233 |
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if (dir) {
|
| 234 |
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memcpy(buf, dev->broadcast, dev->addr_len);
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| 235 |
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return 0;
|
| 236 |
|
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}
|
| 237 |
|
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}
|
| 238 |
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return -EINVAL;
|
| 239 |
|
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}
|
| 240 |
|
|
|
| 241 |
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static u32 ndisc_hash(const void *pkey, const struct net_device *dev)
|
| 242 |
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{
|
| 243 |
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u32 hash_val;
|
| 244 |
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|
|
| 245 |
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hash_val = *(u32*)(pkey + sizeof(struct in6_addr) - 4);
|
| 246 |
|
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hash_val ^= (hash_val>>16);
|
| 247 |
|
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hash_val ^= hash_val>>8;
|
| 248 |
|
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hash_val ^= hash_val>>3;
|
| 249 |
|
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hash_val = (hash_val^dev->ifindex)&NEIGH_HASHMASK;
|
| 250 |
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|
| 251 |
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return hash_val;
|
| 252 |
|
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}
|
| 253 |
|
|
|
| 254 |
|
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static int ndisc_constructor(struct neighbour *neigh)
|
| 255 |
|
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{
|
| 256 |
|
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struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key;
|
| 257 |
|
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struct net_device *dev = neigh->dev;
|
| 258 |
|
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struct inet6_dev *in6_dev = in6_dev_get(dev);
|
| 259 |
|
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int addr_type;
|
| 260 |
|
|
|
| 261 |
|
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if (in6_dev == NULL)
|
| 262 |
|
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return -EINVAL;
|
| 263 |
|
|
|
| 264 |
|
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addr_type = ipv6_addr_type(addr);
|
| 265 |
|
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if (in6_dev->nd_parms)
|
| 266 |
|
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neigh->parms = in6_dev->nd_parms;
|
| 267 |
|
|
|
| 268 |
|
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if (addr_type&IPV6_ADDR_MULTICAST)
|
| 269 |
|
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neigh->type = RTN_MULTICAST;
|
| 270 |
|
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else
|
| 271 |
|
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neigh->type = RTN_UNICAST;
|
| 272 |
|
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if (dev->hard_header == NULL) {
|
| 273 |
|
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neigh->nud_state = NUD_NOARP;
|
| 274 |
|
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neigh->ops = &ndisc_direct_ops;
|
| 275 |
|
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neigh->output = neigh->ops->queue_xmit;
|
| 276 |
|
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} else {
|
| 277 |
|
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if (addr_type&IPV6_ADDR_MULTICAST) {
|
| 278 |
|
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neigh->nud_state = NUD_NOARP;
|
| 279 |
|
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ndisc_mc_map(addr, neigh->ha, dev, 1);
|
| 280 |
|
|
} else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
|
| 281 |
|
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neigh->nud_state = NUD_NOARP;
|
| 282 |
|
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memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
|
| 283 |
|
|
if (dev->flags&IFF_LOOPBACK)
|
| 284 |
|
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neigh->type = RTN_LOCAL;
|
| 285 |
|
|
} else if (dev->flags&IFF_POINTOPOINT) {
|
| 286 |
|
|
neigh->nud_state = NUD_NOARP;
|
| 287 |
|
|
memcpy(neigh->ha, dev->broadcast, dev->addr_len);
|
| 288 |
|
|
}
|
| 289 |
|
|
if (dev->hard_header_cache)
|
| 290 |
|
|
neigh->ops = &ndisc_hh_ops;
|
| 291 |
|
|
else
|
| 292 |
|
|
neigh->ops = &ndisc_generic_ops;
|
| 293 |
|
|
if (neigh->nud_state&NUD_VALID)
|
| 294 |
|
|
neigh->output = neigh->ops->connected_output;
|
| 295 |
|
|
else
|
| 296 |
|
|
neigh->output = neigh->ops->output;
|
| 297 |
|
|
}
|
| 298 |
|
|
in6_dev_put(in6_dev);
|
| 299 |
|
|
return 0;
|
| 300 |
|
|
}
|
| 301 |
|
|
|
| 302 |
|
|
static int pndisc_constructor(struct pneigh_entry *n)
|
| 303 |
|
|
{
|
| 304 |
|
|
struct in6_addr *addr = (struct in6_addr*)&n->key;
|
| 305 |
|
|
struct in6_addr maddr;
|
| 306 |
|
|
struct net_device *dev = n->dev;
|
| 307 |
|
|
|
| 308 |
|
|
if (dev == NULL || __in6_dev_get(dev) == NULL)
|
| 309 |
|
|
return -EINVAL;
|
| 310 |
|
|
addrconf_addr_solict_mult(addr, &maddr);
|
| 311 |
|
|
ipv6_dev_mc_inc(dev, &maddr);
|
| 312 |
|
|
return 0;
|
| 313 |
|
|
}
|
| 314 |
|
|
|
| 315 |
|
|
static void pndisc_destructor(struct pneigh_entry *n)
|
| 316 |
|
|
{
|
| 317 |
|
|
struct in6_addr *addr = (struct in6_addr*)&n->key;
|
| 318 |
|
|
struct in6_addr maddr;
|
| 319 |
|
|
struct net_device *dev = n->dev;
|
| 320 |
|
|
|
| 321 |
|
|
if (dev == NULL || __in6_dev_get(dev) == NULL)
|
| 322 |
|
|
return;
|
| 323 |
|
|
addrconf_addr_solict_mult(addr, &maddr);
|
| 324 |
|
|
ipv6_dev_mc_dec(dev, &maddr);
|
| 325 |
|
|
}
|
| 326 |
|
|
|
| 327 |
|
|
|
| 328 |
|
|
|
| 329 |
|
|
static int
|
| 330 |
|
|
ndisc_build_ll_hdr(struct sk_buff *skb, struct net_device *dev,
|
| 331 |
|
|
struct in6_addr *daddr, struct neighbour *neigh, int len)
|
| 332 |
|
|
{
|
| 333 |
|
|
unsigned char ha[MAX_ADDR_LEN];
|
| 334 |
|
|
unsigned char *h_dest = NULL;
|
| 335 |
|
|
|
| 336 |
|
|
skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
|
| 337 |
|
|
|
| 338 |
|
|
if (dev->hard_header) {
|
| 339 |
|
|
if (ipv6_addr_type(daddr) & IPV6_ADDR_MULTICAST) {
|
| 340 |
|
|
ndisc_mc_map(daddr, ha, dev, 1);
|
| 341 |
|
|
h_dest = ha;
|
| 342 |
|
|
} else if (neigh) {
|
| 343 |
|
|
read_lock_bh(&neigh->lock);
|
| 344 |
|
|
if (neigh->nud_state&NUD_VALID) {
|
| 345 |
|
|
memcpy(ha, neigh->ha, dev->addr_len);
|
| 346 |
|
|
h_dest = ha;
|
| 347 |
|
|
}
|
| 348 |
|
|
read_unlock_bh(&neigh->lock);
|
| 349 |
|
|
} else {
|
| 350 |
|
|
neigh = neigh_lookup(&nd_tbl, daddr, dev);
|
| 351 |
|
|
if (neigh) {
|
| 352 |
|
|
read_lock_bh(&neigh->lock);
|
| 353 |
|
|
if (neigh->nud_state&NUD_VALID) {
|
| 354 |
|
|
memcpy(ha, neigh->ha, dev->addr_len);
|
| 355 |
|
|
h_dest = ha;
|
| 356 |
|
|
}
|
| 357 |
|
|
read_unlock_bh(&neigh->lock);
|
| 358 |
|
|
neigh_release(neigh);
|
| 359 |
|
|
}
|
| 360 |
|
|
}
|
| 361 |
|
|
|
| 362 |
|
|
if (dev->hard_header(skb, dev, ETH_P_IPV6, h_dest, NULL, len) < 0)
|
| 363 |
|
|
return 0;
|
| 364 |
|
|
}
|
| 365 |
|
|
|
| 366 |
|
|
return 1;
|
| 367 |
|
|
}
|
| 368 |
|
|
|
| 369 |
|
|
|
| 370 |
|
|
/*
|
| 371 |
|
|
* Send a Neighbour Advertisement
|
| 372 |
|
|
*/
|
| 373 |
|
|
|
| 374 |
|
|
void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
|
| 375 |
|
|
struct in6_addr *daddr, struct in6_addr *solicited_addr,
|
| 376 |
|
|
int router, int solicited, int override, int inc_opt)
|
| 377 |
|
|
{
|
| 378 |
|
|
static struct in6_addr tmpaddr;
|
| 379 |
|
|
struct inet6_ifaddr *ifp;
|
| 380 |
|
|
struct sock *sk = ndisc_socket->sk;
|
| 381 |
|
|
struct in6_addr *src_addr;
|
| 382 |
|
|
struct nd_msg *msg;
|
| 383 |
|
|
int len;
|
| 384 |
|
|
struct sk_buff *skb;
|
| 385 |
|
|
int err;
|
| 386 |
|
|
|
| 387 |
|
|
len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
|
| 388 |
|
|
|
| 389 |
|
|
if (inc_opt) {
|
| 390 |
|
|
if (dev->addr_len)
|
| 391 |
|
|
len += NDISC_OPT_SPACE(dev->addr_len);
|
| 392 |
|
|
else
|
| 393 |
|
|
inc_opt = 0;
|
| 394 |
|
|
}
|
| 395 |
|
|
|
| 396 |
|
|
skb = sock_alloc_send_skb(sk, MAX_HEADER + len + dev->hard_header_len + 15,
|
| 397 |
|
|
1, &err);
|
| 398 |
|
|
|
| 399 |
|
|
if (skb == NULL) {
|
| 400 |
|
|
ND_PRINTK1("send_na: alloc skb failed\n");
|
| 401 |
|
|
return;
|
| 402 |
|
|
}
|
| 403 |
|
|
/* for anycast or proxy, solicited_addr != src_addr */
|
| 404 |
|
|
ifp = ipv6_get_ifaddr(solicited_addr, dev);
|
| 405 |
|
|
if (ifp) {
|
| 406 |
|
|
src_addr = solicited_addr;
|
| 407 |
|
|
in6_ifa_put(ifp);
|
| 408 |
|
|
} else {
|
| 409 |
|
|
if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr, 0))
|
| 410 |
|
|
return;
|
| 411 |
|
|
src_addr = &tmpaddr;
|
| 412 |
|
|
}
|
| 413 |
|
|
|
| 414 |
|
|
if (ndisc_build_ll_hdr(skb, dev, daddr, neigh, len) == 0) {
|
| 415 |
|
|
kfree_skb(skb);
|
| 416 |
|
|
return;
|
| 417 |
|
|
}
|
| 418 |
|
|
|
| 419 |
|
|
ip6_nd_hdr(sk, skb, dev, src_addr, daddr, IPPROTO_ICMPV6, len);
|
| 420 |
|
|
|
| 421 |
|
|
msg = (struct nd_msg *) skb_put(skb, len);
|
| 422 |
|
|
|
| 423 |
|
|
msg->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
|
| 424 |
|
|
msg->icmph.icmp6_code = 0;
|
| 425 |
|
|
msg->icmph.icmp6_cksum = 0;
|
| 426 |
|
|
|
| 427 |
|
|
msg->icmph.icmp6_unused = 0;
|
| 428 |
|
|
msg->icmph.icmp6_router = router;
|
| 429 |
|
|
msg->icmph.icmp6_solicited = solicited;
|
| 430 |
|
|
msg->icmph.icmp6_override = !!override;
|
| 431 |
|
|
|
| 432 |
|
|
/* Set the target address. */
|
| 433 |
|
|
ipv6_addr_copy(&msg->target, solicited_addr);
|
| 434 |
|
|
|
| 435 |
|
|
if (inc_opt)
|
| 436 |
|
|
ndisc_fill_option(msg->opt, ND_OPT_TARGET_LL_ADDR, dev->dev_addr, dev->addr_len);
|
| 437 |
|
|
|
| 438 |
|
|
/* checksum */
|
| 439 |
|
|
msg->icmph.icmp6_cksum = csum_ipv6_magic(src_addr, daddr, len,
|
| 440 |
|
|
IPPROTO_ICMPV6,
|
| 441 |
|
|
csum_partial((__u8 *) msg,
|
| 442 |
|
|
len, 0));
|
| 443 |
|
|
|
| 444 |
|
|
dev_queue_xmit(skb);
|
| 445 |
|
|
|
| 446 |
|
|
ICMP6_INC_STATS(Icmp6OutNeighborAdvertisements);
|
| 447 |
|
|
ICMP6_INC_STATS(Icmp6OutMsgs);
|
| 448 |
|
|
}
|
| 449 |
|
|
|
| 450 |
|
|
void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
|
| 451 |
|
|
struct in6_addr *solicit,
|
| 452 |
|
|
struct in6_addr *daddr, struct in6_addr *saddr)
|
| 453 |
|
|
{
|
| 454 |
|
|
struct sock *sk = ndisc_socket->sk;
|
| 455 |
|
|
struct sk_buff *skb;
|
| 456 |
|
|
struct nd_msg *msg;
|
| 457 |
|
|
struct in6_addr addr_buf;
|
| 458 |
|
|
int len;
|
| 459 |
|
|
int err;
|
| 460 |
|
|
int send_llinfo;
|
| 461 |
|
|
|
| 462 |
|
|
if (saddr == NULL) {
|
| 463 |
|
|
if (ipv6_get_lladdr(dev, &addr_buf))
|
| 464 |
|
|
return;
|
| 465 |
|
|
saddr = &addr_buf;
|
| 466 |
|
|
}
|
| 467 |
|
|
|
| 468 |
|
|
len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
|
| 469 |
|
|
send_llinfo = dev->addr_len && ipv6_addr_type(saddr) != IPV6_ADDR_ANY;
|
| 470 |
|
|
if (send_llinfo)
|
| 471 |
|
|
len += NDISC_OPT_SPACE(dev->addr_len);
|
| 472 |
|
|
|
| 473 |
|
|
skb = sock_alloc_send_skb(sk, MAX_HEADER + len + dev->hard_header_len + 15,
|
| 474 |
|
|
1, &err);
|
| 475 |
|
|
if (skb == NULL) {
|
| 476 |
|
|
ND_PRINTK1("send_ns: alloc skb failed\n");
|
| 477 |
|
|
return;
|
| 478 |
|
|
}
|
| 479 |
|
|
|
| 480 |
|
|
if (ndisc_build_ll_hdr(skb, dev, daddr, neigh, len) == 0) {
|
| 481 |
|
|
kfree_skb(skb);
|
| 482 |
|
|
return;
|
| 483 |
|
|
}
|
| 484 |
|
|
|
| 485 |
|
|
ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
|
| 486 |
|
|
|
| 487 |
|
|
msg = (struct nd_msg *)skb_put(skb, len);
|
| 488 |
|
|
msg->icmph.icmp6_type = NDISC_NEIGHBOUR_SOLICITATION;
|
| 489 |
|
|
msg->icmph.icmp6_code = 0;
|
| 490 |
|
|
msg->icmph.icmp6_cksum = 0;
|
| 491 |
|
|
msg->icmph.icmp6_unused = 0;
|
| 492 |
|
|
|
| 493 |
|
|
/* Set the target address. */
|
| 494 |
|
|
ipv6_addr_copy(&msg->target, solicit);
|
| 495 |
|
|
|
| 496 |
|
|
if (send_llinfo)
|
| 497 |
|
|
ndisc_fill_option(msg->opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr, dev->addr_len);
|
| 498 |
|
|
|
| 499 |
|
|
/* checksum */
|
| 500 |
|
|
msg->icmph.icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr,
|
| 501 |
|
|
daddr, len,
|
| 502 |
|
|
IPPROTO_ICMPV6,
|
| 503 |
|
|
csum_partial((__u8 *) msg,
|
| 504 |
|
|
len, 0));
|
| 505 |
|
|
/* send it! */
|
| 506 |
|
|
dev_queue_xmit(skb);
|
| 507 |
|
|
|
| 508 |
|
|
ICMP6_INC_STATS(Icmp6OutNeighborSolicits);
|
| 509 |
|
|
ICMP6_INC_STATS(Icmp6OutMsgs);
|
| 510 |
|
|
}
|
| 511 |
|
|
|
| 512 |
|
|
void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr,
|
| 513 |
|
|
struct in6_addr *daddr)
|
| 514 |
|
|
{
|
| 515 |
|
|
struct sock *sk = ndisc_socket->sk;
|
| 516 |
|
|
struct sk_buff *skb;
|
| 517 |
|
|
struct icmp6hdr *hdr;
|
| 518 |
|
|
__u8 * opt;
|
| 519 |
|
|
int len;
|
| 520 |
|
|
int err;
|
| 521 |
|
|
|
| 522 |
|
|
len = sizeof(struct icmp6hdr);
|
| 523 |
|
|
if (dev->addr_len)
|
| 524 |
|
|
len += NDISC_OPT_SPACE(dev->addr_len);
|
| 525 |
|
|
|
| 526 |
|
|
skb = sock_alloc_send_skb(sk, MAX_HEADER + len + dev->hard_header_len + 15,
|
| 527 |
|
|
1, &err);
|
| 528 |
|
|
if (skb == NULL) {
|
| 529 |
|
|
ND_PRINTK1("send_ns: alloc skb failed\n");
|
| 530 |
|
|
return;
|
| 531 |
|
|
}
|
| 532 |
|
|
|
| 533 |
|
|
if (ndisc_build_ll_hdr(skb, dev, daddr, NULL, len) == 0) {
|
| 534 |
|
|
kfree_skb(skb);
|
| 535 |
|
|
return;
|
| 536 |
|
|
}
|
| 537 |
|
|
|
| 538 |
|
|
ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
|
| 539 |
|
|
|
| 540 |
|
|
hdr = (struct icmp6hdr *) skb_put(skb, len);
|
| 541 |
|
|
hdr->icmp6_type = NDISC_ROUTER_SOLICITATION;
|
| 542 |
|
|
hdr->icmp6_code = 0;
|
| 543 |
|
|
hdr->icmp6_cksum = 0;
|
| 544 |
|
|
hdr->icmp6_unused = 0;
|
| 545 |
|
|
|
| 546 |
|
|
opt = (u8*) (hdr + 1);
|
| 547 |
|
|
|
| 548 |
|
|
if (dev->addr_len)
|
| 549 |
|
|
ndisc_fill_option(opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr, dev->addr_len);
|
| 550 |
|
|
|
| 551 |
|
|
/* checksum */
|
| 552 |
|
|
hdr->icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr, daddr, len,
|
| 553 |
|
|
IPPROTO_ICMPV6,
|
| 554 |
|
|
csum_partial((__u8 *) hdr, len, 0));
|
| 555 |
|
|
|
| 556 |
|
|
/* send it! */
|
| 557 |
|
|
dev_queue_xmit(skb);
|
| 558 |
|
|
|
| 559 |
|
|
ICMP6_INC_STATS(Icmp6OutRouterSolicits);
|
| 560 |
|
|
ICMP6_INC_STATS(Icmp6OutMsgs);
|
| 561 |
|
|
}
|
| 562 |
|
|
|
| 563 |
|
|
|
| 564 |
|
|
static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
|
| 565 |
|
|
{
|
| 566 |
|
|
/*
|
| 567 |
|
|
* "The sender MUST return an ICMP
|
| 568 |
|
|
* destination unreachable"
|
| 569 |
|
|
*/
|
| 570 |
|
|
dst_link_failure(skb);
|
| 571 |
|
|
kfree_skb(skb);
|
| 572 |
|
|
}
|
| 573 |
|
|
|
| 574 |
|
|
/* Called with locked neigh: either read or both */
|
| 575 |
|
|
|
| 576 |
|
|
static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
|
| 577 |
|
|
{
|
| 578 |
|
|
struct in6_addr *saddr = NULL;
|
| 579 |
|
|
struct in6_addr mcaddr;
|
| 580 |
|
|
struct net_device *dev = neigh->dev;
|
| 581 |
|
|
struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
|
| 582 |
|
|
int probes = atomic_read(&neigh->probes);
|
| 583 |
|
|
|
| 584 |
|
|
if (skb && ipv6_chk_addr(&skb->nh.ipv6h->saddr, dev))
|
| 585 |
|
|
saddr = &skb->nh.ipv6h->saddr;
|
| 586 |
|
|
|
| 587 |
|
|
if ((probes -= neigh->parms->ucast_probes) < 0) {
|
| 588 |
|
|
if (!(neigh->nud_state&NUD_VALID))
|
| 589 |
|
|
ND_PRINTK1("trying to ucast probe in NUD_INVALID\n");
|
| 590 |
|
|
ndisc_send_ns(dev, neigh, target, target, saddr);
|
| 591 |
|
|
} else if ((probes -= neigh->parms->app_probes) < 0) {
|
| 592 |
|
|
#ifdef CONFIG_ARPD
|
| 593 |
|
|
neigh_app_ns(neigh);
|
| 594 |
|
|
#endif
|
| 595 |
|
|
} else {
|
| 596 |
|
|
addrconf_addr_solict_mult(target, &mcaddr);
|
| 597 |
|
|
ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
|
| 598 |
|
|
}
|
| 599 |
|
|
}
|
| 600 |
|
|
|
| 601 |
|
|
void ndisc_recv_ns(struct sk_buff *skb)
|
| 602 |
|
|
{
|
| 603 |
|
|
struct nd_msg *msg = (struct nd_msg *)skb->h.raw;
|
| 604 |
|
|
struct in6_addr *saddr = &skb->nh.ipv6h->saddr;
|
| 605 |
|
|
struct in6_addr *daddr = &skb->nh.ipv6h->daddr;
|
| 606 |
|
|
u8 *lladdr = NULL;
|
| 607 |
|
|
int lladdrlen = 0;
|
| 608 |
|
|
u32 ndoptlen = skb->tail - msg->opt;
|
| 609 |
|
|
struct ndisc_options ndopts;
|
| 610 |
|
|
struct net_device *dev = skb->dev;
|
| 611 |
|
|
struct inet6_ifaddr *ifp;
|
| 612 |
|
|
struct neighbour *neigh;
|
| 613 |
|
|
|
| 614 |
|
|
if (skb->len < sizeof(struct nd_msg)) {
|
| 615 |
|
|
if (net_ratelimit())
|
| 616 |
|
|
printk(KERN_WARNING "ICMP NS: packet too short\n");
|
| 617 |
|
|
return;
|
| 618 |
|
|
}
|
| 619 |
|
|
|
| 620 |
|
|
if (ipv6_addr_type(&msg->target)&IPV6_ADDR_MULTICAST) {
|
| 621 |
|
|
if (net_ratelimit())
|
| 622 |
|
|
printk(KERN_WARNING "ICMP NS: target address is multicast\n");
|
| 623 |
|
|
return;
|
| 624 |
|
|
}
|
| 625 |
|
|
|
| 626 |
|
|
if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
|
| 627 |
|
|
if (net_ratelimit())
|
| 628 |
|
|
printk(KERN_WARNING "ICMP NS: invalid ND option, ignored.\n");
|
| 629 |
|
|
return;
|
| 630 |
|
|
}
|
| 631 |
|
|
|
| 632 |
|
|
if (ndopts.nd_opts_src_lladdr) {
|
| 633 |
|
|
lladdr = (u8*)(ndopts.nd_opts_src_lladdr + 1);
|
| 634 |
|
|
lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
|
| 635 |
|
|
if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len)) {
|
| 636 |
|
|
if (net_ratelimit())
|
| 637 |
|
|
printk(KERN_WARNING "ICMP NS: bad lladdr length.\n");
|
| 638 |
|
|
return;
|
| 639 |
|
|
}
|
| 640 |
|
|
}
|
| 641 |
|
|
|
| 642 |
|
|
/* XXX: RFC2461 7.1.1:
|
| 643 |
|
|
* If the IP source address is the unspecified address, there
|
| 644 |
|
|
* MUST NOT be source link-layer address option in the message.
|
| 645 |
|
|
*
|
| 646 |
|
|
* NOTE! Linux kernel < 2.4.4 broke this rule.
|
| 647 |
|
|
*/
|
| 648 |
|
|
|
| 649 |
|
|
/* XXX: RFC2461 7.1.1:
|
| 650 |
|
|
* If the IP source address is the unspecified address, the IP
|
| 651 |
|
|
* destination address MUST be a solicited-node multicast address.
|
| 652 |
|
|
*/
|
| 653 |
|
|
|
| 654 |
|
|
if ((ifp = ipv6_get_ifaddr(&msg->target, dev)) != NULL) {
|
| 655 |
|
|
int addr_type = ipv6_addr_type(saddr);
|
| 656 |
|
|
|
| 657 |
|
|
if (ifp->flags & IFA_F_TENTATIVE) {
|
| 658 |
|
|
/* Address is tentative. If the source
|
| 659 |
|
|
is unspecified address, it is someone
|
| 660 |
|
|
does DAD, otherwise we ignore solicitations
|
| 661 |
|
|
until DAD timer expires.
|
| 662 |
|
|
*/
|
| 663 |
|
|
if (addr_type == IPV6_ADDR_ANY) {
|
| 664 |
|
|
if (dev->type == ARPHRD_IEEE802_TR) {
|
| 665 |
|
|
unsigned char *sadr = skb->mac.raw ;
|
| 666 |
|
|
if (((sadr[8] &0x7f) != (dev->dev_addr[0] & 0x7f)) ||
|
| 667 |
|
|
(sadr[9] != dev->dev_addr[1]) ||
|
| 668 |
|
|
(sadr[10] != dev->dev_addr[2]) ||
|
| 669 |
|
|
(sadr[11] != dev->dev_addr[3]) ||
|
| 670 |
|
|
(sadr[12] != dev->dev_addr[4]) ||
|
| 671 |
|
|
(sadr[13] != dev->dev_addr[5]))
|
| 672 |
|
|
{
|
| 673 |
|
|
addrconf_dad_failure(ifp) ;
|
| 674 |
|
|
}
|
| 675 |
|
|
} else {
|
| 676 |
|
|
addrconf_dad_failure(ifp);
|
| 677 |
|
|
}
|
| 678 |
|
|
} else
|
| 679 |
|
|
in6_ifa_put(ifp);
|
| 680 |
|
|
return;
|
| 681 |
|
|
}
|
| 682 |
|
|
|
| 683 |
|
|
if (addr_type == IPV6_ADDR_ANY) {
|
| 684 |
|
|
struct in6_addr maddr;
|
| 685 |
|
|
|
| 686 |
|
|
ipv6_addr_all_nodes(&maddr);
|
| 687 |
|
|
ndisc_send_na(dev, NULL, &maddr, &ifp->addr,
|
| 688 |
|
|
ifp->idev->cnf.forwarding, 0,
|
| 689 |
|
|
ipv6_addr_type(&ifp->addr)&IPV6_ADDR_ANYCAST ? 0 : 1,
|
| 690 |
|
|
1);
|
| 691 |
|
|
in6_ifa_put(ifp);
|
| 692 |
|
|
return;
|
| 693 |
|
|
}
|
| 694 |
|
|
|
| 695 |
|
|
if (addr_type & IPV6_ADDR_UNICAST) {
|
| 696 |
|
|
int inc = ipv6_addr_type(daddr)&IPV6_ADDR_MULTICAST;
|
| 697 |
|
|
|
| 698 |
|
|
if (inc)
|
| 699 |
|
|
nd_tbl.stats.rcv_probes_mcast++;
|
| 700 |
|
|
else
|
| 701 |
|
|
nd_tbl.stats.rcv_probes_ucast++;
|
| 702 |
|
|
|
| 703 |
|
|
/*
|
| 704 |
|
|
* update / create cache entry
|
| 705 |
|
|
* for the source adddress
|
| 706 |
|
|
*/
|
| 707 |
|
|
|
| 708 |
|
|
neigh = neigh_event_ns(&nd_tbl, lladdr, saddr, dev);
|
| 709 |
|
|
|
| 710 |
|
|
if (neigh || !dev->hard_header) {
|
| 711 |
|
|
ndisc_send_na(dev, neigh, saddr, &ifp->addr,
|
| 712 |
|
|
ifp->idev->cnf.forwarding, 1,
|
| 713 |
|
|
ipv6_addr_type(&ifp->addr)&IPV6_ADDR_ANYCAST ? 0 : 1,
|
| 714 |
|
|
1);
|
| 715 |
|
|
if (neigh)
|
| 716 |
|
|
neigh_release(neigh);
|
| 717 |
|
|
}
|
| 718 |
|
|
}
|
| 719 |
|
|
in6_ifa_put(ifp);
|
| 720 |
|
|
} else if (ipv6_chk_acast_addr(dev, &msg->target)) {
|
| 721 |
|
|
struct inet6_dev *idev = in6_dev_get(dev);
|
| 722 |
|
|
int addr_type = ipv6_addr_type(saddr);
|
| 723 |
|
|
|
| 724 |
|
|
/* anycast */
|
| 725 |
|
|
|
| 726 |
|
|
if (!idev) {
|
| 727 |
|
|
/* XXX: count this drop? */
|
| 728 |
|
|
return;
|
| 729 |
|
|
}
|
| 730 |
|
|
|
| 731 |
|
|
if (addr_type == IPV6_ADDR_ANY) {
|
| 732 |
|
|
struct in6_addr maddr;
|
| 733 |
|
|
|
| 734 |
|
|
ipv6_addr_all_nodes(&maddr);
|
| 735 |
|
|
ndisc_send_na(dev, NULL, &maddr, &msg->target,
|
| 736 |
|
|
idev->cnf.forwarding, 0, 0, 1);
|
| 737 |
|
|
in6_dev_put(idev);
|
| 738 |
|
|
return;
|
| 739 |
|
|
}
|
| 740 |
|
|
|
| 741 |
|
|
if (addr_type & IPV6_ADDR_UNICAST) {
|
| 742 |
|
|
int inc = ipv6_addr_type(daddr)&IPV6_ADDR_MULTICAST;
|
| 743 |
|
|
if (inc)
|
| 744 |
|
|
nd_tbl.stats.rcv_probes_mcast++;
|
| 745 |
|
|
else
|
| 746 |
|
|
nd_tbl.stats.rcv_probes_ucast++;
|
| 747 |
|
|
|
| 748 |
|
|
/*
|
| 749 |
|
|
* update / create cache entry
|
| 750 |
|
|
* for the source adddress
|
| 751 |
|
|
*/
|
| 752 |
|
|
|
| 753 |
|
|
neigh = neigh_event_ns(&nd_tbl, lladdr, saddr, skb->dev);
|
| 754 |
|
|
|
| 755 |
|
|
if (neigh || !dev->hard_header) {
|
| 756 |
|
|
ndisc_send_na(dev, neigh, saddr,
|
| 757 |
|
|
&msg->target,
|
| 758 |
|
|
idev->cnf.forwarding, 1, 0, inc);
|
| 759 |
|
|
if (neigh)
|
| 760 |
|
|
neigh_release(neigh);
|
| 761 |
|
|
}
|
| 762 |
|
|
}
|
| 763 |
|
|
in6_dev_put(idev);
|
| 764 |
|
|
} else {
|
| 765 |
|
|
struct inet6_dev *in6_dev = in6_dev_get(dev);
|
| 766 |
|
|
int addr_type = ipv6_addr_type(saddr);
|
| 767 |
|
|
|
| 768 |
|
|
if (in6_dev && in6_dev->cnf.forwarding &&
|
| 769 |
|
|
(addr_type & IPV6_ADDR_UNICAST) &&
|
| 770 |
|
|
pneigh_lookup(&nd_tbl, &msg->target, dev, 0)) {
|
| 771 |
|
|
int inc = ipv6_addr_type(daddr)&IPV6_ADDR_MULTICAST;
|
| 772 |
|
|
|
| 773 |
|
|
if (skb->stamp.tv_sec == 0 ||
|
| 774 |
|
|
skb->pkt_type == PACKET_HOST ||
|
| 775 |
|
|
inc == 0 ||
|
| 776 |
|
|
in6_dev->nd_parms->proxy_delay == 0) {
|
| 777 |
|
|
if (inc)
|
| 778 |
|
|
nd_tbl.stats.rcv_probes_mcast++;
|
| 779 |
|
|
else
|
| 780 |
|
|
nd_tbl.stats.rcv_probes_ucast++;
|
| 781 |
|
|
|
| 782 |
|
|
neigh = neigh_event_ns(&nd_tbl, lladdr, saddr, dev);
|
| 783 |
|
|
|
| 784 |
|
|
if (neigh) {
|
| 785 |
|
|
ndisc_send_na(dev, neigh, saddr, &msg->target,
|
| 786 |
|
|
0, 1, 0, 1);
|
| 787 |
|
|
neigh_release(neigh);
|
| 788 |
|
|
}
|
| 789 |
|
|
} else {
|
| 790 |
|
|
struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
|
| 791 |
|
|
if (n)
|
| 792 |
|
|
pneigh_enqueue(&nd_tbl, in6_dev->nd_parms, n);
|
| 793 |
|
|
in6_dev_put(in6_dev);
|
| 794 |
|
|
return;
|
| 795 |
|
|
}
|
| 796 |
|
|
}
|
| 797 |
|
|
if (in6_dev)
|
| 798 |
|
|
in6_dev_put(in6_dev);
|
| 799 |
|
|
}
|
| 800 |
|
|
return;
|
| 801 |
|
|
}
|
| 802 |
|
|
|
| 803 |
|
|
void ndisc_recv_na(struct sk_buff *skb)
|
| 804 |
|
|
{
|
| 805 |
|
|
struct nd_msg *msg = (struct nd_msg *)skb->h.raw;
|
| 806 |
|
|
struct in6_addr *saddr = &skb->nh.ipv6h->saddr;
|
| 807 |
|
|
struct in6_addr *daddr = &skb->nh.ipv6h->daddr;
|
| 808 |
|
|
u8 *lladdr = NULL;
|
| 809 |
|
|
int lladdrlen = 0;
|
| 810 |
|
|
u32 ndoptlen = skb->tail - msg->opt;
|
| 811 |
|
|
struct ndisc_options ndopts;
|
| 812 |
|
|
struct net_device *dev = skb->dev;
|
| 813 |
|
|
struct inet6_ifaddr *ifp;
|
| 814 |
|
|
struct neighbour *neigh;
|
| 815 |
|
|
|
| 816 |
|
|
if (skb->len < sizeof(struct nd_msg)) {
|
| 817 |
|
|
if (net_ratelimit())
|
| 818 |
|
|
printk(KERN_WARNING "ICMP NA: packet too short\n");
|
| 819 |
|
|
return;
|
| 820 |
|
|
}
|
| 821 |
|
|
|
| 822 |
|
|
if (ipv6_addr_type(&msg->target)&IPV6_ADDR_MULTICAST) {
|
| 823 |
|
|
if (net_ratelimit())
|
| 824 |
|
|
printk(KERN_WARNING "NDISC NA: target address is multicast\n");
|
| 825 |
|
|
return;
|
| 826 |
|
|
}
|
| 827 |
|
|
|
| 828 |
|
|
if ((ipv6_addr_type(daddr)&IPV6_ADDR_MULTICAST) &&
|
| 829 |
|
|
msg->icmph.icmp6_solicited) {
|
| 830 |
|
|
ND_PRINTK0("NDISC: solicited NA is multicasted\n");
|
| 831 |
|
|
return;
|
| 832 |
|
|
}
|
| 833 |
|
|
|
| 834 |
|
|
if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
|
| 835 |
|
|
if (net_ratelimit())
|
| 836 |
|
|
printk(KERN_WARNING "ICMP NS: invalid ND option, ignored.\n");
|
| 837 |
|
|
return;
|
| 838 |
|
|
}
|
| 839 |
|
|
if (ndopts.nd_opts_tgt_lladdr) {
|
| 840 |
|
|
lladdr = (u8*)(ndopts.nd_opts_tgt_lladdr + 1);
|
| 841 |
|
|
lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
|
| 842 |
|
|
if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len)) {
|
| 843 |
|
|
if (net_ratelimit())
|
| 844 |
|
|
printk(KERN_WARNING "NDISC NA: invalid lladdr length.\n");
|
| 845 |
|
|
return;
|
| 846 |
|
|
}
|
| 847 |
|
|
}
|
| 848 |
|
|
if ((ifp = ipv6_get_ifaddr(&msg->target, dev))) {
|
| 849 |
|
|
if (ifp->flags & IFA_F_TENTATIVE) {
|
| 850 |
|
|
addrconf_dad_failure(ifp);
|
| 851 |
|
|
return;
|
| 852 |
|
|
}
|
| 853 |
|
|
/* What should we make now? The advertisement
|
| 854 |
|
|
is invalid, but ndisc specs say nothing
|
| 855 |
|
|
about it. It could be misconfiguration, or
|
| 856 |
|
|
an smart proxy agent tries to help us :-)
|
| 857 |
|
|
*/
|
| 858 |
|
|
ND_PRINTK0("%s: someone advertises our address!\n",
|
| 859 |
|
|
ifp->idev->dev->name);
|
| 860 |
|
|
in6_ifa_put(ifp);
|
| 861 |
|
|
return;
|
| 862 |
|
|
}
|
| 863 |
|
|
neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
|
| 864 |
|
|
|
| 865 |
|
|
if (neigh) {
|
| 866 |
|
|
if (neigh->flags & NTF_ROUTER) {
|
| 867 |
|
|
if (msg->icmph.icmp6_router == 0) {
|
| 868 |
|
|
/*
|
| 869 |
|
|
* Change: router to host
|
| 870 |
|
|
*/
|
| 871 |
|
|
struct rt6_info *rt;
|
| 872 |
|
|
rt = rt6_get_dflt_router(saddr, dev);
|
| 873 |
|
|
if (rt) {
|
| 874 |
|
|
/* It is safe only because
|
| 875 |
|
|
we aer in BH */
|
| 876 |
|
|
dst_release(&rt->u.dst);
|
| 877 |
|
|
ip6_del_rt(rt, NULL);
|
| 878 |
|
|
}
|
| 879 |
|
|
}
|
| 880 |
|
|
} else {
|
| 881 |
|
|
if (msg->icmph.icmp6_router)
|
| 882 |
|
|
neigh->flags |= NTF_ROUTER;
|
| 883 |
|
|
}
|
| 884 |
|
|
|
| 885 |
|
|
neigh_update(neigh, lladdr,
|
| 886 |
|
|
msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
|
| 887 |
|
|
msg->icmph.icmp6_override, 1);
|
| 888 |
|
|
neigh_release(neigh);
|
| 889 |
|
|
}
|
| 890 |
|
|
}
|
| 891 |
|
|
|
| 892 |
|
|
static void ndisc_router_discovery(struct sk_buff *skb)
|
| 893 |
|
|
{
|
| 894 |
|
|
struct ra_msg *ra_msg = (struct ra_msg *) skb->h.raw;
|
| 895 |
|
|
struct neighbour *neigh;
|
| 896 |
|
|
struct inet6_dev *in6_dev;
|
| 897 |
|
|
struct rt6_info *rt;
|
| 898 |
|
|
int lifetime;
|
| 899 |
|
|
struct ndisc_options ndopts;
|
| 900 |
|
|
int optlen;
|
| 901 |
|
|
|
| 902 |
|
|
__u8 * opt = (__u8 *)(ra_msg + 1);
|
| 903 |
|
|
|
| 904 |
|
|
optlen = (skb->tail - skb->h.raw) - sizeof(struct ra_msg);
|
| 905 |
|
|
|
| 906 |
|
|
if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
|
| 907 |
|
|
if (net_ratelimit())
|
| 908 |
|
|
printk(KERN_WARNING "ICMP RA: source address is not linklocal\n");
|
| 909 |
|
|
return;
|
| 910 |
|
|
}
|
| 911 |
|
|
if (optlen < 0) {
|
| 912 |
|
|
if (net_ratelimit())
|
| 913 |
|
|
printk(KERN_WARNING "ICMP RA: packet too short\n");
|
| 914 |
|
|
return;
|
| 915 |
|
|
}
|
| 916 |
|
|
|
| 917 |
|
|
/*
|
| 918 |
|
|
* set the RA_RECV flag in the interface
|
| 919 |
|
|
*/
|
| 920 |
|
|
|
| 921 |
|
|
in6_dev = in6_dev_get(skb->dev);
|
| 922 |
|
|
if (in6_dev == NULL) {
|
| 923 |
|
|
ND_PRINTK1("RA: can't find in6 device\n");
|
| 924 |
|
|
return;
|
| 925 |
|
|
}
|
| 926 |
|
|
if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) {
|
| 927 |
|
|
in6_dev_put(in6_dev);
|
| 928 |
|
|
return;
|
| 929 |
|
|
}
|
| 930 |
|
|
|
| 931 |
|
|
if (!ndisc_parse_options(opt, optlen, &ndopts)) {
|
| 932 |
|
|
in6_dev_put(in6_dev);
|
| 933 |
|
|
if (net_ratelimit())
|
| 934 |
|
|
ND_PRINTK2(KERN_WARNING
|
| 935 |
|
|
"ICMP6 RA: invalid ND option, ignored.\n");
|
| 936 |
|
|
return;
|
| 937 |
|
|
}
|
| 938 |
|
|
|
| 939 |
|
|
if (in6_dev->if_flags & IF_RS_SENT) {
|
| 940 |
|
|
/*
|
| 941 |
|
|
* flag that an RA was received after an RS was sent
|
| 942 |
|
|
* out on this interface.
|
| 943 |
|
|
*/
|
| 944 |
|
|
in6_dev->if_flags |= IF_RA_RCVD;
|
| 945 |
|
|
}
|
| 946 |
|
|
|
| 947 |
|
|
/*
|
| 948 |
|
|
* Remember the managed/otherconf flags from most recently
|
| 949 |
|
|
* received RA message (RFC 2462) -- yoshfuji
|
| 950 |
|
|
*/
|
| 951 |
|
|
in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
|
| 952 |
|
|
IF_RA_OTHERCONF)) |
|
| 953 |
|
|
(ra_msg->icmph.icmp6_addrconf_managed ?
|
| 954 |
|
|
IF_RA_MANAGED : 0) |
|
| 955 |
|
|
(ra_msg->icmph.icmp6_addrconf_other ?
|
| 956 |
|
|
IF_RA_OTHERCONF : 0);
|
| 957 |
|
|
|
| 958 |
|
|
lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
|
| 959 |
|
|
|
| 960 |
|
|
rt = rt6_get_dflt_router(&skb->nh.ipv6h->saddr, skb->dev);
|
| 961 |
|
|
|
| 962 |
|
|
if (rt && lifetime == 0) {
|
| 963 |
|
|
ip6_del_rt(rt, NULL);
|
| 964 |
|
|
rt = NULL;
|
| 965 |
|
|
}
|
| 966 |
|
|
|
| 967 |
|
|
if (rt == NULL && lifetime) {
|
| 968 |
|
|
ND_PRINTK2("ndisc_rdisc: adding default router\n");
|
| 969 |
|
|
|
| 970 |
|
|
rt = rt6_add_dflt_router(&skb->nh.ipv6h->saddr, skb->dev);
|
| 971 |
|
|
if (rt == NULL) {
|
| 972 |
|
|
ND_PRINTK1("route_add failed\n");
|
| 973 |
|
|
in6_dev_put(in6_dev);
|
| 974 |
|
|
return;
|
| 975 |
|
|
}
|
| 976 |
|
|
|
| 977 |
|
|
neigh = rt->rt6i_nexthop;
|
| 978 |
|
|
if (neigh == NULL) {
|
| 979 |
|
|
ND_PRINTK1("nd: add default router: null neighbour\n");
|
| 980 |
|
|
dst_release(&rt->u.dst);
|
| 981 |
|
|
in6_dev_put(in6_dev);
|
| 982 |
|
|
return;
|
| 983 |
|
|
}
|
| 984 |
|
|
neigh->flags |= NTF_ROUTER;
|
| 985 |
|
|
|
| 986 |
|
|
/*
|
| 987 |
|
|
* If we where using an "all destinations on link" route
|
| 988 |
|
|
* delete it
|
| 989 |
|
|
*/
|
| 990 |
|
|
|
| 991 |
|
|
rt6_purge_dflt_routers(RTF_ALLONLINK);
|
| 992 |
|
|
}
|
| 993 |
|
|
|
| 994 |
|
|
if (rt)
|
| 995 |
|
|
rt->rt6i_expires = jiffies + (HZ * lifetime);
|
| 996 |
|
|
|
| 997 |
|
|
if (ra_msg->icmph.icmp6_hop_limit)
|
| 998 |
|
|
in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
|
| 999 |
|
|
|
| 1000 |
|
|
/*
|
| 1001 |
|
|
* Update Reachable Time and Retrans Timer
|
| 1002 |
|
|
*/
|
| 1003 |
|
|
|
| 1004 |
|
|
if (in6_dev->nd_parms) {
|
| 1005 |
|
|
unsigned long rtime = ntohl(ra_msg->retrans_timer);
|
| 1006 |
|
|
|
| 1007 |
|
|
if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
|
| 1008 |
|
|
rtime = (rtime*HZ)/1000;
|
| 1009 |
|
|
if (rtime < HZ/10)
|
| 1010 |
|
|
rtime = HZ/10;
|
| 1011 |
|
|
in6_dev->nd_parms->retrans_time = rtime;
|
| 1012 |
|
|
}
|
| 1013 |
|
|
|
| 1014 |
|
|
rtime = ntohl(ra_msg->reachable_time);
|
| 1015 |
|
|
if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
|
| 1016 |
|
|
rtime = (rtime*HZ)/1000;
|
| 1017 |
|
|
|
| 1018 |
|
|
if (rtime < HZ/10)
|
| 1019 |
|
|
rtime = HZ/10;
|
| 1020 |
|
|
|
| 1021 |
|
|
if (rtime != in6_dev->nd_parms->base_reachable_time) {
|
| 1022 |
|
|
in6_dev->nd_parms->base_reachable_time = rtime;
|
| 1023 |
|
|
in6_dev->nd_parms->gc_staletime = 3 * rtime;
|
| 1024 |
|
|
in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
|
| 1025 |
|
|
}
|
| 1026 |
|
|
}
|
| 1027 |
|
|
}
|
| 1028 |
|
|
|
| 1029 |
|
|
/*
|
| 1030 |
|
|
* Process options.
|
| 1031 |
|
|
*/
|
| 1032 |
|
|
|
| 1033 |
|
|
if (rt && (neigh = rt->rt6i_nexthop) != NULL) {
|
| 1034 |
|
|
u8 *lladdr = NULL;
|
| 1035 |
|
|
int lladdrlen;
|
| 1036 |
|
|
if (ndopts.nd_opts_src_lladdr) {
|
| 1037 |
|
|
lladdr = (u8*)((ndopts.nd_opts_src_lladdr)+1);
|
| 1038 |
|
|
lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
|
| 1039 |
|
|
if (lladdrlen != NDISC_OPT_SPACE(skb->dev->addr_len)) {
|
| 1040 |
|
|
if (net_ratelimit())
|
| 1041 |
|
|
ND_PRINTK2(KERN_WARNING
|
| 1042 |
|
|
"ICMP6 RA: Invalid lladdr length.\n");
|
| 1043 |
|
|
goto out;
|
| 1044 |
|
|
}
|
| 1045 |
|
|
}
|
| 1046 |
|
|
neigh_update(neigh, lladdr, NUD_STALE, 1, 1);
|
| 1047 |
|
|
}
|
| 1048 |
|
|
|
| 1049 |
|
|
if (ndopts.nd_opts_pi) {
|
| 1050 |
|
|
struct nd_opt_hdr *p;
|
| 1051 |
|
|
for (p = ndopts.nd_opts_pi;
|
| 1052 |
|
|
p;
|
| 1053 |
|
|
p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
|
| 1054 |
|
|
addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3);
|
| 1055 |
|
|
}
|
| 1056 |
|
|
}
|
| 1057 |
|
|
|
| 1058 |
|
|
if (ndopts.nd_opts_mtu) {
|
| 1059 |
|
|
u32 mtu;
|
| 1060 |
|
|
|
| 1061 |
|
|
memcpy(&mtu, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
|
| 1062 |
|
|
mtu = ntohl(mtu);
|
| 1063 |
|
|
|
| 1064 |
|
|
if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
|
| 1065 |
|
|
if (net_ratelimit()) {
|
| 1066 |
|
|
ND_PRINTK0("NDISC: router announcement with mtu = %d\n",
|
| 1067 |
|
|
mtu);
|
| 1068 |
|
|
}
|
| 1069 |
|
|
}
|
| 1070 |
|
|
|
| 1071 |
|
|
if (in6_dev->cnf.mtu6 != mtu) {
|
| 1072 |
|
|
in6_dev->cnf.mtu6 = mtu;
|
| 1073 |
|
|
|
| 1074 |
|
|
if (rt)
|
| 1075 |
|
|
rt->u.dst.pmtu = mtu;
|
| 1076 |
|
|
|
| 1077 |
|
|
rt6_mtu_change(skb->dev, mtu);
|
| 1078 |
|
|
}
|
| 1079 |
|
|
}
|
| 1080 |
|
|
|
| 1081 |
|
|
if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
|
| 1082 |
|
|
if (net_ratelimit())
|
| 1083 |
|
|
ND_PRINTK0(KERN_WARNING
|
| 1084 |
|
|
"ICMP6 RA: got illegal option with RA");
|
| 1085 |
|
|
}
|
| 1086 |
|
|
out:
|
| 1087 |
|
|
if (rt)
|
| 1088 |
|
|
dst_release(&rt->u.dst);
|
| 1089 |
|
|
in6_dev_put(in6_dev);
|
| 1090 |
|
|
}
|
| 1091 |
|
|
|
| 1092 |
|
|
static void ndisc_redirect_rcv(struct sk_buff *skb)
|
| 1093 |
|
|
{
|
| 1094 |
|
|
struct inet6_dev *in6_dev;
|
| 1095 |
|
|
struct icmp6hdr *icmph;
|
| 1096 |
|
|
struct in6_addr *dest;
|
| 1097 |
|
|
struct in6_addr *target; /* new first hop to destination */
|
| 1098 |
|
|
struct neighbour *neigh;
|
| 1099 |
|
|
int on_link = 0;
|
| 1100 |
|
|
struct ndisc_options ndopts;
|
| 1101 |
|
|
int optlen;
|
| 1102 |
|
|
u8 *lladdr = NULL;
|
| 1103 |
|
|
int lladdrlen;
|
| 1104 |
|
|
|
| 1105 |
|
|
if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
|
| 1106 |
|
|
if (net_ratelimit())
|
| 1107 |
|
|
printk(KERN_WARNING "ICMP redirect: source address is not linklocal\n");
|
| 1108 |
|
|
return;
|
| 1109 |
|
|
}
|
| 1110 |
|
|
|
| 1111 |
|
|
optlen = skb->tail - skb->h.raw;
|
| 1112 |
|
|
optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
|
| 1113 |
|
|
|
| 1114 |
|
|
if (optlen < 0) {
|
| 1115 |
|
|
if (net_ratelimit())
|
| 1116 |
|
|
printk(KERN_WARNING "ICMP redirect: packet too small\n");
|
| 1117 |
|
|
return;
|
| 1118 |
|
|
}
|
| 1119 |
|
|
|
| 1120 |
|
|
icmph = (struct icmp6hdr *) skb->h.raw;
|
| 1121 |
|
|
target = (struct in6_addr *) (icmph + 1);
|
| 1122 |
|
|
dest = target + 1;
|
| 1123 |
|
|
|
| 1124 |
|
|
if (ipv6_addr_type(dest) & IPV6_ADDR_MULTICAST) {
|
| 1125 |
|
|
if (net_ratelimit())
|
| 1126 |
|
|
printk(KERN_WARNING "ICMP redirect for multicast addr\n");
|
| 1127 |
|
|
return;
|
| 1128 |
|
|
}
|
| 1129 |
|
|
|
| 1130 |
|
|
if (ipv6_addr_cmp(dest, target) == 0) {
|
| 1131 |
|
|
on_link = 1;
|
| 1132 |
|
|
} else if (!(ipv6_addr_type(target) & IPV6_ADDR_LINKLOCAL)) {
|
| 1133 |
|
|
if (net_ratelimit())
|
| 1134 |
|
|
printk(KERN_WARNING "ICMP redirect: target address is not linklocal\n");
|
| 1135 |
|
|
return;
|
| 1136 |
|
|
}
|
| 1137 |
|
|
|
| 1138 |
|
|
in6_dev = in6_dev_get(skb->dev);
|
| 1139 |
|
|
if (!in6_dev)
|
| 1140 |
|
|
return;
|
| 1141 |
|
|
if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) {
|
| 1142 |
|
|
in6_dev_put(in6_dev);
|
| 1143 |
|
|
return;
|
| 1144 |
|
|
}
|
| 1145 |
|
|
|
| 1146 |
|
|
/* XXX: RFC2461 8.1:
|
| 1147 |
|
|
* The IP source address of the Redirect MUST be the same as the current
|
| 1148 |
|
|
* first-hop router for the specified ICMP Destination Address.
|
| 1149 |
|
|
*/
|
| 1150 |
|
|
|
| 1151 |
|
|
if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
|
| 1152 |
|
|
if (net_ratelimit())
|
| 1153 |
|
|
ND_PRINTK2(KERN_WARNING
|
| 1154 |
|
|
"ICMP6 Redirect: invalid ND options, rejected.\n");
|
| 1155 |
|
|
in6_dev_put(in6_dev);
|
| 1156 |
|
|
return;
|
| 1157 |
|
|
}
|
| 1158 |
|
|
if (ndopts.nd_opts_tgt_lladdr) {
|
| 1159 |
|
|
lladdr = (u8*)(ndopts.nd_opts_tgt_lladdr + 1);
|
| 1160 |
|
|
lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
|
| 1161 |
|
|
if (lladdrlen != NDISC_OPT_SPACE(skb->dev->addr_len)) {
|
| 1162 |
|
|
if (net_ratelimit())
|
| 1163 |
|
|
ND_PRINTK2(KERN_WARNING
|
| 1164 |
|
|
"ICMP6 Redirect: invalid lladdr length.\n");
|
| 1165 |
|
|
in6_dev_put(in6_dev);
|
| 1166 |
|
|
return;
|
| 1167 |
|
|
}
|
| 1168 |
|
|
}
|
| 1169 |
|
|
/* passed validation tests */
|
| 1170 |
|
|
|
| 1171 |
|
|
/*
|
| 1172 |
|
|
We install redirect only if nexthop state is valid.
|
| 1173 |
|
|
*/
|
| 1174 |
|
|
|
| 1175 |
|
|
neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
|
| 1176 |
|
|
if (neigh) {
|
| 1177 |
|
|
neigh_update(neigh, lladdr, NUD_STALE, 1, 1);
|
| 1178 |
|
|
if (neigh->nud_state&NUD_VALID)
|
| 1179 |
|
|
rt6_redirect(dest, &skb->nh.ipv6h->saddr, neigh, on_link);
|
| 1180 |
|
|
else
|
| 1181 |
|
|
__neigh_event_send(neigh, NULL);
|
| 1182 |
|
|
neigh_release(neigh);
|
| 1183 |
|
|
}
|
| 1184 |
|
|
in6_dev_put(in6_dev);
|
| 1185 |
|
|
}
|
| 1186 |
|
|
|
| 1187 |
|
|
void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
|
| 1188 |
|
|
struct in6_addr *target)
|
| 1189 |
|
|
{
|
| 1190 |
|
|
struct sock *sk = ndisc_socket->sk;
|
| 1191 |
|
|
int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
|
| 1192 |
|
|
struct sk_buff *buff;
|
| 1193 |
|
|
struct icmp6hdr *icmph;
|
| 1194 |
|
|
struct in6_addr saddr_buf;
|
| 1195 |
|
|
struct in6_addr *addrp;
|
| 1196 |
|
|
struct net_device *dev;
|
| 1197 |
|
|
struct rt6_info *rt;
|
| 1198 |
|
|
u8 *opt;
|
| 1199 |
|
|
int rd_len;
|
| 1200 |
|
|
int err;
|
| 1201 |
|
|
int hlen;
|
| 1202 |
|
|
|
| 1203 |
|
|
dev = skb->dev;
|
| 1204 |
|
|
rt = rt6_lookup(&skb->nh.ipv6h->saddr, NULL, dev->ifindex, 1);
|
| 1205 |
|
|
|
| 1206 |
|
|
if (rt == NULL)
|
| 1207 |
|
|
return;
|
| 1208 |
|
|
|
| 1209 |
|
|
if (rt->rt6i_flags & RTF_GATEWAY) {
|
| 1210 |
|
|
ND_PRINTK1("ndisc_send_redirect: not a neighbour\n");
|
| 1211 |
|
|
dst_release(&rt->u.dst);
|
| 1212 |
|
|
return;
|
| 1213 |
|
|
}
|
| 1214 |
|
|
if (!xrlim_allow(&rt->u.dst, 1*HZ)) {
|
| 1215 |
|
|
dst_release(&rt->u.dst);
|
| 1216 |
|
|
return;
|
| 1217 |
|
|
}
|
| 1218 |
|
|
dst_release(&rt->u.dst);
|
| 1219 |
|
|
|
| 1220 |
|
|
if (dev->addr_len) {
|
| 1221 |
|
|
if (neigh->nud_state&NUD_VALID) {
|
| 1222 |
|
|
len += NDISC_OPT_SPACE(dev->addr_len);
|
| 1223 |
|
|
} else {
|
| 1224 |
|
|
/* If nexthop is not valid, do not redirect!
|
| 1225 |
|
|
We will make it later, when will be sure,
|
| 1226 |
|
|
that it is alive.
|
| 1227 |
|
|
*/
|
| 1228 |
|
|
return;
|
| 1229 |
|
|
}
|
| 1230 |
|
|
}
|
| 1231 |
|
|
|
| 1232 |
|
|
rd_len = min_t(unsigned int,
|
| 1233 |
|
|
IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8);
|
| 1234 |
|
|
rd_len &= ~0x7;
|
| 1235 |
|
|
len += rd_len;
|
| 1236 |
|
|
|
| 1237 |
|
|
if (ipv6_get_lladdr(dev, &saddr_buf)) {
|
| 1238 |
|
|
ND_PRINTK1("redirect: no link_local addr for dev\n");
|
| 1239 |
|
|
return;
|
| 1240 |
|
|
}
|
| 1241 |
|
|
|
| 1242 |
|
|
buff = sock_alloc_send_skb(sk, MAX_HEADER + len + dev->hard_header_len + 15,
|
| 1243 |
|
|
1, &err);
|
| 1244 |
|
|
if (buff == NULL) {
|
| 1245 |
|
|
ND_PRINTK1("ndisc_send_redirect: alloc_skb failed\n");
|
| 1246 |
|
|
return;
|
| 1247 |
|
|
}
|
| 1248 |
|
|
|
| 1249 |
|
|
hlen = 0;
|
| 1250 |
|
|
|
| 1251 |
|
|
if (ndisc_build_ll_hdr(buff, dev, &skb->nh.ipv6h->saddr, NULL, len) == 0) {
|
| 1252 |
|
|
kfree_skb(buff);
|
| 1253 |
|
|
return;
|
| 1254 |
|
|
}
|
| 1255 |
|
|
|
| 1256 |
|
|
ip6_nd_hdr(sk, buff, dev, &saddr_buf, &skb->nh.ipv6h->saddr,
|
| 1257 |
|
|
IPPROTO_ICMPV6, len);
|
| 1258 |
|
|
|
| 1259 |
|
|
icmph = (struct icmp6hdr *) skb_put(buff, len);
|
| 1260 |
|
|
|
| 1261 |
|
|
memset(icmph, 0, sizeof(struct icmp6hdr));
|
| 1262 |
|
|
icmph->icmp6_type = NDISC_REDIRECT;
|
| 1263 |
|
|
|
| 1264 |
|
|
/*
|
| 1265 |
|
|
* copy target and destination addresses
|
| 1266 |
|
|
*/
|
| 1267 |
|
|
|
| 1268 |
|
|
addrp = (struct in6_addr *)(icmph + 1);
|
| 1269 |
|
|
ipv6_addr_copy(addrp, target);
|
| 1270 |
|
|
addrp++;
|
| 1271 |
|
|
ipv6_addr_copy(addrp, &skb->nh.ipv6h->daddr);
|
| 1272 |
|
|
|
| 1273 |
|
|
opt = (u8*) (addrp + 1);
|
| 1274 |
|
|
|
| 1275 |
|
|
/*
|
| 1276 |
|
|
* include target_address option
|
| 1277 |
|
|
*/
|
| 1278 |
|
|
|
| 1279 |
|
|
if (dev->addr_len)
|
| 1280 |
|
|
opt = ndisc_fill_option(opt, ND_OPT_TARGET_LL_ADDR, neigh->ha, dev->addr_len);
|
| 1281 |
|
|
|
| 1282 |
|
|
/*
|
| 1283 |
|
|
* build redirect option and copy skb over to the new packet.
|
| 1284 |
|
|
*/
|
| 1285 |
|
|
|
| 1286 |
|
|
memset(opt, 0, 8);
|
| 1287 |
|
|
*(opt++) = ND_OPT_REDIRECT_HDR;
|
| 1288 |
|
|
*(opt++) = (rd_len >> 3);
|
| 1289 |
|
|
opt += 6;
|
| 1290 |
|
|
|
| 1291 |
|
|
memcpy(opt, skb->nh.ipv6h, rd_len - 8);
|
| 1292 |
|
|
|
| 1293 |
|
|
icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &skb->nh.ipv6h->saddr,
|
| 1294 |
|
|
len, IPPROTO_ICMPV6,
|
| 1295 |
|
|
csum_partial((u8 *) icmph, len, 0));
|
| 1296 |
|
|
|
| 1297 |
|
|
dev_queue_xmit(buff);
|
| 1298 |
|
|
|
| 1299 |
|
|
ICMP6_INC_STATS(Icmp6OutRedirects);
|
| 1300 |
|
|
ICMP6_INC_STATS(Icmp6OutMsgs);
|
| 1301 |
|
|
}
|
| 1302 |
|
|
|
| 1303 |
|
|
static void pndisc_redo(struct sk_buff *skb)
|
| 1304 |
|
|
{
|
| 1305 |
|
|
ndisc_rcv(skb);
|
| 1306 |
|
|
kfree_skb(skb);
|
| 1307 |
|
|
}
|
| 1308 |
|
|
|
| 1309 |
|
|
int ndisc_rcv(struct sk_buff *skb)
|
| 1310 |
|
|
{
|
| 1311 |
|
|
struct nd_msg *msg = (struct nd_msg *) skb->h.raw;
|
| 1312 |
|
|
|
| 1313 |
|
|
__skb_push(skb, skb->data-skb->h.raw);
|
| 1314 |
|
|
|
| 1315 |
|
|
if (skb->nh.ipv6h->hop_limit != 255) {
|
| 1316 |
|
|
if (net_ratelimit())
|
| 1317 |
|
|
printk(KERN_WARNING
|
| 1318 |
|
|
"ICMP NDISC: fake message with non-255 Hop Limit received: %d\n",
|
| 1319 |
|
|
skb->nh.ipv6h->hop_limit);
|
| 1320 |
|
|
return 0;
|
| 1321 |
|
|
}
|
| 1322 |
|
|
|
| 1323 |
|
|
if (msg->icmph.icmp6_code != 0) {
|
| 1324 |
|
|
if (net_ratelimit())
|
| 1325 |
|
|
printk(KERN_WARNING "ICMP NDISC: code is not zero\n");
|
| 1326 |
|
|
return 0;
|
| 1327 |
|
|
}
|
| 1328 |
|
|
|
| 1329 |
|
|
switch (msg->icmph.icmp6_type) {
|
| 1330 |
|
|
case NDISC_NEIGHBOUR_SOLICITATION:
|
| 1331 |
|
|
ndisc_recv_ns(skb);
|
| 1332 |
|
|
break;
|
| 1333 |
|
|
|
| 1334 |
|
|
case NDISC_NEIGHBOUR_ADVERTISEMENT:
|
| 1335 |
|
|
ndisc_recv_na(skb);
|
| 1336 |
|
|
break;
|
| 1337 |
|
|
|
| 1338 |
|
|
case NDISC_ROUTER_ADVERTISEMENT:
|
| 1339 |
|
|
ndisc_router_discovery(skb);
|
| 1340 |
|
|
break;
|
| 1341 |
|
|
|
| 1342 |
|
|
case NDISC_REDIRECT:
|
| 1343 |
|
|
ndisc_redirect_rcv(skb);
|
| 1344 |
|
|
break;
|
| 1345 |
|
|
};
|
| 1346 |
|
|
|
| 1347 |
|
|
return 0;
|
| 1348 |
|
|
}
|
| 1349 |
|
|
|
| 1350 |
|
|
static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
|
| 1351 |
|
|
{
|
| 1352 |
|
|
struct net_device *dev = ptr;
|
| 1353 |
|
|
|
| 1354 |
|
|
switch (event) {
|
| 1355 |
|
|
case NETDEV_CHANGEADDR:
|
| 1356 |
|
|
neigh_changeaddr(&nd_tbl, dev);
|
| 1357 |
|
|
fib6_run_gc(0);
|
| 1358 |
|
|
break;
|
| 1359 |
|
|
default:
|
| 1360 |
|
|
break;
|
| 1361 |
|
|
}
|
| 1362 |
|
|
|
| 1363 |
|
|
return NOTIFY_DONE;
|
| 1364 |
|
|
}
|
| 1365 |
|
|
|
| 1366 |
|
|
struct notifier_block ndisc_netdev_notifier = {
|
| 1367 |
|
|
.notifier_call = ndisc_netdev_event,
|
| 1368 |
|
|
};
|
| 1369 |
|
|
|
| 1370 |
|
|
int __init ndisc_init(struct net_proto_family *ops)
|
| 1371 |
|
|
{
|
| 1372 |
|
|
struct sock *sk;
|
| 1373 |
|
|
int err;
|
| 1374 |
|
|
|
| 1375 |
|
|
ndisc_socket = sock_alloc();
|
| 1376 |
|
|
if (ndisc_socket == NULL) {
|
| 1377 |
|
|
printk(KERN_ERR
|
| 1378 |
|
|
"Failed to create the NDISC control socket.\n");
|
| 1379 |
|
|
return -1;
|
| 1380 |
|
|
}
|
| 1381 |
|
|
ndisc_socket->inode->i_uid = 0;
|
| 1382 |
|
|
ndisc_socket->inode->i_gid = 0;
|
| 1383 |
|
|
ndisc_socket->type = SOCK_RAW;
|
| 1384 |
|
|
|
| 1385 |
|
|
if((err = ops->create(ndisc_socket, IPPROTO_ICMPV6)) < 0) {
|
| 1386 |
|
|
printk(KERN_DEBUG
|
| 1387 |
|
|
"Failed to initialize the NDISC control socket (err %d).\n",
|
| 1388 |
|
|
err);
|
| 1389 |
|
|
sock_release(ndisc_socket);
|
| 1390 |
|
|
ndisc_socket = NULL; /* For safety. */
|
| 1391 |
|
|
return err;
|
| 1392 |
|
|
}
|
| 1393 |
|
|
|
| 1394 |
|
|
sk = ndisc_socket->sk;
|
| 1395 |
|
|
sk->allocation = GFP_ATOMIC;
|
| 1396 |
|
|
sk->net_pinfo.af_inet6.hop_limit = 255;
|
| 1397 |
|
|
/* Do not loopback ndisc messages */
|
| 1398 |
|
|
sk->net_pinfo.af_inet6.mc_loop = 0;
|
| 1399 |
|
|
sk->prot->unhash(sk);
|
| 1400 |
|
|
|
| 1401 |
|
|
/*
|
| 1402 |
|
|
* Initialize the neighbour table
|
| 1403 |
|
|
*/
|
| 1404 |
|
|
|
| 1405 |
|
|
neigh_table_init(&nd_tbl);
|
| 1406 |
|
|
|
| 1407 |
|
|
#ifdef CONFIG_SYSCTL
|
| 1408 |
|
|
neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6, NET_IPV6_NEIGH, "ipv6");
|
| 1409 |
|
|
#endif
|
| 1410 |
|
|
|
| 1411 |
|
|
register_netdevice_notifier(&ndisc_netdev_notifier);
|
| 1412 |
|
|
return 0;
|
| 1413 |
|
|
}
|
| 1414 |
|
|
|
| 1415 |
|
|
void ndisc_cleanup(void)
|
| 1416 |
|
|
{
|
| 1417 |
|
|
neigh_table_clear(&nd_tbl);
|
| 1418 |
|
|
sock_release(ndisc_socket);
|
| 1419 |
|
|
ndisc_socket = NULL; /* For safety. */
|
| 1420 |
|
|
}
|
