Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * common UDP/RAW code |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 3 | * Linux INET6 implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Authors: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
| 12 | */ |
| 13 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 14 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/errno.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/interrupt.h> |
| 19 | #include <linux/socket.h> |
| 20 | #include <linux/sockios.h> |
| 21 | #include <linux/in6.h> |
| 22 | #include <linux/ipv6.h> |
| 23 | #include <linux/route.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 24 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | #include <net/ipv6.h> |
| 27 | #include <net/ndisc.h> |
| 28 | #include <net/addrconf.h> |
| 29 | #include <net/transp_v6.h> |
| 30 | #include <net/ip6_route.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 31 | #include <net/tcp_states.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #include <linux/errqueue.h> |
| 34 | #include <asm/uaccess.h> |
| 35 | |
Max Matveev | c15fea2 | 2011-08-05 03:56:30 -0700 | [diff] [blame] | 36 | static inline int ipv6_mapped_addr_any(const struct in6_addr *a) |
| 37 | { |
| 38 | return (ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0)); |
| 39 | } |
| 40 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| 42 | { |
| 43 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; |
| 44 | struct inet_sock *inet = inet_sk(sk); |
| 45 | struct ipv6_pinfo *np = inet6_sk(sk); |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 46 | struct in6_addr *daddr, *final_p, final; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | struct dst_entry *dst; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 48 | struct flowi6 fl6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | struct ip6_flowlabel *flowlabel = NULL; |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 50 | struct ipv6_txoptions *opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | int addr_type; |
| 52 | int err; |
| 53 | |
| 54 | if (usin->sin6_family == AF_INET) { |
| 55 | if (__ipv6_only_sock(sk)) |
| 56 | return -EAFNOSUPPORT; |
| 57 | err = ip4_datagram_connect(sk, uaddr, addr_len); |
| 58 | goto ipv4_connected; |
| 59 | } |
| 60 | |
| 61 | if (addr_len < SIN6_LEN_RFC2133) |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 62 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 64 | if (usin->sin6_family != AF_INET6) |
| 65 | return -EAFNOSUPPORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 67 | memset(&fl6, 0, sizeof(fl6)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | if (np->sndflow) { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 69 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| 70 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { |
| 71 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | if (flowlabel == NULL) |
| 73 | return -EINVAL; |
| 74 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | addr_type = ipv6_addr_type(&usin->sin6_addr); |
| 79 | |
| 80 | if (addr_type == IPV6_ADDR_ANY) { |
| 81 | /* |
| 82 | * connect to self |
| 83 | */ |
| 84 | usin->sin6_addr.s6_addr[15] = 0x01; |
| 85 | } |
| 86 | |
| 87 | daddr = &usin->sin6_addr; |
| 88 | |
| 89 | if (addr_type == IPV6_ADDR_MAPPED) { |
| 90 | struct sockaddr_in sin; |
| 91 | |
| 92 | if (__ipv6_only_sock(sk)) { |
| 93 | err = -ENETUNREACH; |
| 94 | goto out; |
| 95 | } |
| 96 | sin.sin_family = AF_INET; |
| 97 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
| 98 | sin.sin_port = usin->sin6_port; |
| 99 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 100 | err = ip4_datagram_connect(sk, |
| 101 | (struct sockaddr*) &sin, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | sizeof(sin)); |
| 103 | |
| 104 | ipv4_connected: |
| 105 | if (err) |
| 106 | goto out; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 107 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 108 | ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Max Matveev | c15fea2 | 2011-08-05 03:56:30 -0700 | [diff] [blame] | 110 | if (ipv6_addr_any(&np->saddr) || |
| 111 | ipv6_mapped_addr_any(&np->saddr)) |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 112 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
Max Matveev | c15fea2 | 2011-08-05 03:56:30 -0700 | [diff] [blame] | 114 | if (ipv6_addr_any(&np->rcv_saddr) || |
| 115 | ipv6_mapped_addr_any(&np->rcv_saddr)) { |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 116 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, |
| 117 | &np->rcv_saddr); |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 118 | if (sk->sk_prot->rehash) |
| 119 | sk->sk_prot->rehash(sk); |
| 120 | } |
Brian Haley | b301e82 | 2009-10-07 13:58:25 -0700 | [diff] [blame] | 121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | goto out; |
| 123 | } |
| 124 | |
| 125 | if (addr_type&IPV6_ADDR_LINKLOCAL) { |
| 126 | if (addr_len >= sizeof(struct sockaddr_in6) && |
| 127 | usin->sin6_scope_id) { |
| 128 | if (sk->sk_bound_dev_if && |
| 129 | sk->sk_bound_dev_if != usin->sin6_scope_id) { |
| 130 | err = -EINVAL; |
| 131 | goto out; |
| 132 | } |
| 133 | sk->sk_bound_dev_if = usin->sin6_scope_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | } |
| 135 | |
Brian Haley | 1ac4f00 | 2008-01-08 23:52:21 -0800 | [diff] [blame] | 136 | if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) |
| 137 | sk->sk_bound_dev_if = np->mcast_oif; |
| 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | /* Connect to link-local address requires an interface */ |
| 140 | if (!sk->sk_bound_dev_if) { |
| 141 | err = -EINVAL; |
| 142 | goto out; |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | ipv6_addr_copy(&np->daddr, daddr); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 147 | np->flow_label = fl6.flowlabel; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 149 | inet->inet_dport = usin->sin6_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
| 151 | /* |
| 152 | * Check for a route to destination an obtain the |
| 153 | * destination cache for it. |
| 154 | */ |
| 155 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 156 | fl6.flowi6_proto = sk->sk_protocol; |
| 157 | ipv6_addr_copy(&fl6.daddr, &np->daddr); |
| 158 | ipv6_addr_copy(&fl6.saddr, &np->saddr); |
| 159 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
| 160 | fl6.flowi6_mark = sk->sk_mark; |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 161 | fl6.fl6_dport = inet->inet_dport; |
| 162 | fl6.fl6_sport = inet->inet_sport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 164 | if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) |
| 165 | fl6.flowi6_oif = np->mcast_oif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 167 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 168 | |
Arnaud Ebalard | 20c59de | 2010-06-01 21:35:01 +0000 | [diff] [blame] | 169 | opt = flowlabel ? flowlabel->opt : np->opt; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 170 | final_p = fl6_update_dst(&fl6, opt, &final); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 172 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 173 | err = 0; |
| 174 | if (IS_ERR(dst)) { |
| 175 | err = PTR_ERR(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | goto out; |
David S. Miller | 14e50e5 | 2007-05-24 18:17:54 -0700 | [diff] [blame] | 177 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
| 179 | /* source address lookup done in ip6_dst_lookup */ |
| 180 | |
| 181 | if (ipv6_addr_any(&np->saddr)) |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 182 | ipv6_addr_copy(&np->saddr, &fl6.saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
| 184 | if (ipv6_addr_any(&np->rcv_saddr)) { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 185 | ipv6_addr_copy(&np->rcv_saddr, &fl6.saddr); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 186 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 187 | if (sk->sk_prot->rehash) |
| 188 | sk->sk_prot->rehash(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | ip6_dst_store(sk, dst, |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 192 | ipv6_addr_equal(&fl6.daddr, &np->daddr) ? |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 193 | &np->daddr : NULL, |
| 194 | #ifdef CONFIG_IPV6_SUBTREES |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 195 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 196 | &np->saddr : |
| 197 | #endif |
| 198 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
| 200 | sk->sk_state = TCP_ESTABLISHED; |
| 201 | out: |
| 202 | fl6_sock_release(flowlabel); |
| 203 | return err; |
| 204 | } |
| 205 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 206 | void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
Al Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 207 | __be16 port, u32 info, u8 *payload) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | { |
| 209 | struct ipv6_pinfo *np = inet6_sk(sk); |
Arnaldo Carvalho de Melo | cc70ab2 | 2007-03-13 14:03:22 -0300 | [diff] [blame] | 210 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | struct sock_exterr_skb *serr; |
| 212 | |
| 213 | if (!np->recverr) |
| 214 | return; |
| 215 | |
| 216 | skb = skb_clone(skb, GFP_ATOMIC); |
| 217 | if (!skb) |
| 218 | return; |
| 219 | |
Brian Haley | d40a4de | 2010-05-03 15:44:27 +0000 | [diff] [blame] | 220 | skb->protocol = htons(ETH_P_IPV6); |
| 221 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | serr = SKB_EXT_ERR(skb); |
| 223 | serr->ee.ee_errno = err; |
| 224 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 225 | serr->ee.ee_type = icmph->icmp6_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | serr->ee.ee_code = icmph->icmp6_code; |
| 227 | serr->ee.ee_pad = 0; |
| 228 | serr->ee.ee_info = info; |
| 229 | serr->ee.ee_data = 0; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 230 | serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - |
| 231 | skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | serr->port = port; |
| 233 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | __skb_pull(skb, payload - skb->data); |
Arnaldo Carvalho de Melo | bd82393 | 2007-03-13 17:10:43 -0300 | [diff] [blame] | 235 | skb_reset_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
| 237 | if (sock_queue_err_skb(sk, skb)) |
| 238 | kfree_skb(skb); |
| 239 | } |
| 240 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 241 | void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | { |
| 243 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 244 | struct sock_exterr_skb *serr; |
| 245 | struct ipv6hdr *iph; |
| 246 | struct sk_buff *skb; |
| 247 | |
| 248 | if (!np->recverr) |
| 249 | return; |
| 250 | |
| 251 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); |
| 252 | if (!skb) |
| 253 | return; |
| 254 | |
Brian Haley | d40a4de | 2010-05-03 15:44:27 +0000 | [diff] [blame] | 255 | skb->protocol = htons(ETH_P_IPV6); |
| 256 | |
Arnaldo Carvalho de Melo | 1ced98e | 2007-03-10 19:57:15 -0300 | [diff] [blame] | 257 | skb_put(skb, sizeof(struct ipv6hdr)); |
| 258 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 259 | iph = ipv6_hdr(skb); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 260 | ipv6_addr_copy(&iph->daddr, &fl6->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
| 262 | serr = SKB_EXT_ERR(skb); |
| 263 | serr->ee.ee_errno = err; |
| 264 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 265 | serr->ee.ee_type = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | serr->ee.ee_code = 0; |
| 267 | serr->ee.ee_pad = 0; |
| 268 | serr->ee.ee_info = info; |
| 269 | serr->ee.ee_data = 0; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 270 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 271 | serr->port = fl6->fl6_dport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 273 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
Arnaldo Carvalho de Melo | bd82393 | 2007-03-13 17:10:43 -0300 | [diff] [blame] | 274 | skb_reset_transport_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
| 276 | if (sock_queue_err_skb(sk, skb)) |
| 277 | kfree_skb(skb); |
| 278 | } |
| 279 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 280 | void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) |
Brian Haley | 4b340ae | 2010-04-23 11:26:09 +0000 | [diff] [blame] | 281 | { |
| 282 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 283 | struct ipv6hdr *iph; |
| 284 | struct sk_buff *skb; |
| 285 | struct ip6_mtuinfo *mtu_info; |
| 286 | |
| 287 | if (!np->rxopt.bits.rxpmtu) |
| 288 | return; |
| 289 | |
| 290 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); |
| 291 | if (!skb) |
| 292 | return; |
| 293 | |
| 294 | skb_put(skb, sizeof(struct ipv6hdr)); |
| 295 | skb_reset_network_header(skb); |
| 296 | iph = ipv6_hdr(skb); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 297 | ipv6_addr_copy(&iph->daddr, &fl6->daddr); |
Brian Haley | 4b340ae | 2010-04-23 11:26:09 +0000 | [diff] [blame] | 298 | |
| 299 | mtu_info = IP6CBMTU(skb); |
Brian Haley | 4b340ae | 2010-04-23 11:26:09 +0000 | [diff] [blame] | 300 | |
| 301 | mtu_info->ip6m_mtu = mtu; |
| 302 | mtu_info->ip6m_addr.sin6_family = AF_INET6; |
| 303 | mtu_info->ip6m_addr.sin6_port = 0; |
| 304 | mtu_info->ip6m_addr.sin6_flowinfo = 0; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 305 | mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; |
Brian Haley | 4b340ae | 2010-04-23 11:26:09 +0000 | [diff] [blame] | 306 | ipv6_addr_copy(&mtu_info->ip6m_addr.sin6_addr, &ipv6_hdr(skb)->daddr); |
| 307 | |
| 308 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
| 309 | skb_reset_transport_header(skb); |
| 310 | |
| 311 | skb = xchg(&np->rxpmtu, skb); |
| 312 | kfree_skb(skb); |
| 313 | } |
| 314 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 315 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | * Handle MSG_ERRQUEUE |
| 317 | */ |
| 318 | int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len) |
| 319 | { |
| 320 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 321 | struct sock_exterr_skb *serr; |
| 322 | struct sk_buff *skb, *skb2; |
| 323 | struct sockaddr_in6 *sin; |
| 324 | struct { |
| 325 | struct sock_extended_err ee; |
| 326 | struct sockaddr_in6 offender; |
| 327 | } errhdr; |
| 328 | int err; |
| 329 | int copied; |
| 330 | |
| 331 | err = -EAGAIN; |
| 332 | skb = skb_dequeue(&sk->sk_error_queue); |
| 333 | if (skb == NULL) |
| 334 | goto out; |
| 335 | |
| 336 | copied = skb->len; |
| 337 | if (copied > len) { |
| 338 | msg->msg_flags |= MSG_TRUNC; |
| 339 | copied = len; |
| 340 | } |
| 341 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| 342 | if (err) |
| 343 | goto out_free_skb; |
| 344 | |
| 345 | sock_recv_timestamp(msg, sk, skb); |
| 346 | |
| 347 | serr = SKB_EXT_ERR(skb); |
| 348 | |
| 349 | sin = (struct sockaddr_in6 *)msg->msg_name; |
| 350 | if (sin) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 351 | const unsigned char *nh = skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | sin->sin6_family = AF_INET6; |
| 353 | sin->sin6_flowinfo = 0; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 354 | sin->sin6_port = serr->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | sin->sin6_scope_id = 0; |
Brian Haley | d40a4de | 2010-05-03 15:44:27 +0000 | [diff] [blame] | 356 | if (skb->protocol == htons(ETH_P_IPV6)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | ipv6_addr_copy(&sin->sin6_addr, |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 358 | (struct in6_addr *)(nh + serr->addr_offset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | if (np->sndflow) |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 360 | sin->sin6_flowinfo = |
| 361 | (*(__be32 *)(nh + serr->addr_offset - 24) & |
| 362 | IPV6_FLOWINFO_MASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| 364 | sin->sin6_scope_id = IP6CB(skb)->iif; |
| 365 | } else { |
Brian Haley | b301e82 | 2009-10-07 13:58:25 -0700 | [diff] [blame] | 366 | ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), |
| 367 | &sin->sin6_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | } |
| 369 | } |
| 370 | |
| 371 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); |
| 372 | sin = &errhdr.offender; |
| 373 | sin->sin6_family = AF_UNSPEC; |
| 374 | if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { |
| 375 | sin->sin6_family = AF_INET6; |
| 376 | sin->sin6_flowinfo = 0; |
| 377 | sin->sin6_scope_id = 0; |
Brian Haley | d40a4de | 2010-05-03 15:44:27 +0000 | [diff] [blame] | 378 | if (skb->protocol == htons(ETH_P_IPV6)) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 379 | ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | if (np->rxopt.all) |
| 381 | datagram_recv_ctl(sk, msg, skb); |
| 382 | if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| 383 | sin->sin6_scope_id = IP6CB(skb)->iif; |
| 384 | } else { |
| 385 | struct inet_sock *inet = inet_sk(sk); |
| 386 | |
Brian Haley | b301e82 | 2009-10-07 13:58:25 -0700 | [diff] [blame] | 387 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
| 388 | &sin->sin6_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | if (inet->cmsg_flags) |
| 390 | ip_cmsg_recv(msg, skb); |
| 391 | } |
| 392 | } |
| 393 | |
| 394 | put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); |
| 395 | |
| 396 | /* Now we could try to dump offended packet options */ |
| 397 | |
| 398 | msg->msg_flags |= MSG_ERRQUEUE; |
| 399 | err = copied; |
| 400 | |
| 401 | /* Reset and regenerate socket error */ |
Herbert Xu | e0f9f85 | 2005-06-18 22:56:18 -0700 | [diff] [blame] | 402 | spin_lock_bh(&sk->sk_error_queue.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | sk->sk_err = 0; |
| 404 | if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { |
| 405 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; |
Herbert Xu | e0f9f85 | 2005-06-18 22:56:18 -0700 | [diff] [blame] | 406 | spin_unlock_bh(&sk->sk_error_queue.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | sk->sk_error_report(sk); |
| 408 | } else { |
Herbert Xu | e0f9f85 | 2005-06-18 22:56:18 -0700 | [diff] [blame] | 409 | spin_unlock_bh(&sk->sk_error_queue.lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | } |
| 411 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 412 | out_free_skb: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | kfree_skb(skb); |
| 414 | out: |
| 415 | return err; |
| 416 | } |
| 417 | |
Brian Haley | 4b340ae | 2010-04-23 11:26:09 +0000 | [diff] [blame] | 418 | /* |
| 419 | * Handle IPV6_RECVPATHMTU |
| 420 | */ |
| 421 | int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len) |
| 422 | { |
| 423 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 424 | struct sk_buff *skb; |
| 425 | struct sockaddr_in6 *sin; |
| 426 | struct ip6_mtuinfo mtu_info; |
| 427 | int err; |
| 428 | int copied; |
| 429 | |
| 430 | err = -EAGAIN; |
| 431 | skb = xchg(&np->rxpmtu, NULL); |
| 432 | if (skb == NULL) |
| 433 | goto out; |
| 434 | |
| 435 | copied = skb->len; |
| 436 | if (copied > len) { |
| 437 | msg->msg_flags |= MSG_TRUNC; |
| 438 | copied = len; |
| 439 | } |
| 440 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| 441 | if (err) |
| 442 | goto out_free_skb; |
| 443 | |
| 444 | sock_recv_timestamp(msg, sk, skb); |
| 445 | |
| 446 | memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); |
| 447 | |
| 448 | sin = (struct sockaddr_in6 *)msg->msg_name; |
| 449 | if (sin) { |
| 450 | sin->sin6_family = AF_INET6; |
| 451 | sin->sin6_flowinfo = 0; |
| 452 | sin->sin6_port = 0; |
| 453 | sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; |
| 454 | ipv6_addr_copy(&sin->sin6_addr, &mtu_info.ip6m_addr.sin6_addr); |
| 455 | } |
| 456 | |
| 457 | put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); |
| 458 | |
| 459 | err = copied; |
| 460 | |
| 461 | out_free_skb: |
| 462 | kfree_skb(skb); |
| 463 | out: |
| 464 | return err; |
| 465 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | |
| 468 | int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) |
| 469 | { |
| 470 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 471 | struct inet6_skb_parm *opt = IP6CB(skb); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 472 | unsigned char *nh = skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
| 474 | if (np->rxopt.bits.rxinfo) { |
| 475 | struct in6_pktinfo src_info; |
| 476 | |
| 477 | src_info.ipi6_ifindex = opt->iif; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 478 | ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info); |
| 480 | } |
| 481 | |
| 482 | if (np->rxopt.bits.rxhlim) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 483 | int hlim = ipv6_hdr(skb)->hop_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); |
| 485 | } |
| 486 | |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 487 | if (np->rxopt.bits.rxtclass) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 488 | int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 489 | put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); |
| 490 | } |
| 491 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 492 | if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) { |
| 493 | __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); |
| 495 | } |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 496 | |
| 497 | /* HbH is allowed only once */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | if (np->rxopt.bits.hopopts && opt->hop) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 499 | u8 *ptr = nh + opt->hop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); |
| 501 | } |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 502 | |
| 503 | if (opt->lastopt && |
| 504 | (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { |
| 505 | /* |
| 506 | * Silly enough, but we need to reparse in order to |
| 507 | * report extension headers (except for HbH) |
| 508 | * in order. |
| 509 | * |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 510 | * Also note that IPV6_RECVRTHDRDSTOPTS is NOT |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 511 | * (and WILL NOT be) defined because |
| 512 | * IPV6_RECVDSTOPTS is more generic. --yoshfuji |
| 513 | */ |
| 514 | unsigned int off = sizeof(struct ipv6hdr); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 515 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 516 | |
| 517 | while (off <= opt->lastopt) { |
| 518 | unsigned len; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 519 | u8 *ptr = nh + off; |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 520 | |
| 521 | switch(nexthdr) { |
| 522 | case IPPROTO_DSTOPTS: |
| 523 | nexthdr = ptr[0]; |
| 524 | len = (ptr[1] + 1) << 3; |
| 525 | if (np->rxopt.bits.dstopts) |
| 526 | put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); |
| 527 | break; |
| 528 | case IPPROTO_ROUTING: |
| 529 | nexthdr = ptr[0]; |
| 530 | len = (ptr[1] + 1) << 3; |
| 531 | if (np->rxopt.bits.srcrt) |
| 532 | put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); |
| 533 | break; |
| 534 | case IPPROTO_AH: |
| 535 | nexthdr = ptr[0]; |
Ville Nuorvala | a305989 | 2005-11-20 12:21:59 +0900 | [diff] [blame] | 536 | len = (ptr[1] + 2) << 2; |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 537 | break; |
| 538 | default: |
| 539 | nexthdr = ptr[0]; |
| 540 | len = (ptr[1] + 1) << 3; |
| 541 | break; |
| 542 | } |
| 543 | |
| 544 | off += len; |
| 545 | } |
| 546 | } |
| 547 | |
| 548 | /* socket options in old style */ |
| 549 | if (np->rxopt.bits.rxoinfo) { |
| 550 | struct in6_pktinfo src_info; |
| 551 | |
| 552 | src_info.ipi6_ifindex = opt->iif; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 553 | ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 554 | put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); |
| 555 | } |
| 556 | if (np->rxopt.bits.rxohlim) { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 557 | int hlim = ipv6_hdr(skb)->hop_limit; |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 558 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); |
| 559 | } |
| 560 | if (np->rxopt.bits.ohopopts && opt->hop) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 561 | u8 *ptr = nh + opt->hop; |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 562 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); |
| 563 | } |
| 564 | if (np->rxopt.bits.odstopts && opt->dst0) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 565 | u8 *ptr = nh + opt->dst0; |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 566 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | } |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 568 | if (np->rxopt.bits.osrcrt && opt->srcrt) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 569 | struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 570 | put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | } |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 572 | if (np->rxopt.bits.odstopts && opt->dst1) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 573 | u8 *ptr = nh + opt->dst1; |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 574 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | } |
Balazs Scheidler | 6c46862 | 2010-10-21 16:08:28 +0200 | [diff] [blame] | 576 | if (np->rxopt.bits.rxorigdstaddr) { |
| 577 | struct sockaddr_in6 sin6; |
| 578 | u16 *ports = (u16 *) skb_transport_header(skb); |
| 579 | |
| 580 | if (skb_transport_offset(skb) + 4 <= skb->len) { |
| 581 | /* All current transport protocols have the port numbers in the |
| 582 | * first four bytes of the transport header and this function is |
| 583 | * written with this assumption in mind. |
| 584 | */ |
| 585 | |
| 586 | sin6.sin6_family = AF_INET6; |
| 587 | ipv6_addr_copy(&sin6.sin6_addr, &ipv6_hdr(skb)->daddr); |
| 588 | sin6.sin6_port = ports[1]; |
| 589 | sin6.sin6_flowinfo = 0; |
| 590 | sin6.sin6_scope_id = 0; |
| 591 | |
| 592 | put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); |
| 593 | } |
| 594 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | return 0; |
| 596 | } |
| 597 | |
Maciej Żenczykowski | ec0506d | 2011-08-28 12:35:31 +0000 | [diff] [blame] | 598 | int datagram_send_ctl(struct net *net, struct sock *sk, |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 599 | struct msghdr *msg, struct flowi6 *fl6, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | struct ipv6_txoptions *opt, |
Brian Haley | 13b52cd | 2010-04-23 11:26:08 +0000 | [diff] [blame] | 601 | int *hlimit, int *tclass, int *dontfrag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | { |
| 603 | struct in6_pktinfo *src_info; |
| 604 | struct cmsghdr *cmsg; |
| 605 | struct ipv6_rt_hdr *rthdr; |
| 606 | struct ipv6_opt_hdr *hdr; |
| 607 | int len; |
| 608 | int err = 0; |
| 609 | |
| 610 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { |
| 611 | int addr_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
| 613 | if (!CMSG_OK(msg, cmsg)) { |
| 614 | err = -EINVAL; |
| 615 | goto exit_f; |
| 616 | } |
| 617 | |
| 618 | if (cmsg->cmsg_level != SOL_IPV6) |
| 619 | continue; |
| 620 | |
| 621 | switch (cmsg->cmsg_type) { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 622 | case IPV6_PKTINFO: |
| 623 | case IPV6_2292PKTINFO: |
YOSHIFUJI Hideaki | 187e383 | 2008-06-04 13:01:37 +0900 | [diff] [blame] | 624 | { |
| 625 | struct net_device *dev = NULL; |
| 626 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 627 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | err = -EINVAL; |
| 629 | goto exit_f; |
| 630 | } |
| 631 | |
| 632 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | if (src_info->ipi6_ifindex) { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 635 | if (fl6->flowi6_oif && |
| 636 | src_info->ipi6_ifindex != fl6->flowi6_oif) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | return -EINVAL; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 638 | fl6->flowi6_oif = src_info->ipi6_ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | } |
| 640 | |
YOSHIFUJI Hideaki | 187e383 | 2008-06-04 13:01:37 +0900 | [diff] [blame] | 641 | addr_type = __ipv6_addr_type(&src_info->ipi6_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
Eric Dumazet | 536b2e9 | 2009-11-02 12:21:06 +0100 | [diff] [blame] | 643 | rcu_read_lock(); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 644 | if (fl6->flowi6_oif) { |
| 645 | dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); |
Eric Dumazet | 536b2e9 | 2009-11-02 12:21:06 +0100 | [diff] [blame] | 646 | if (!dev) { |
| 647 | rcu_read_unlock(); |
YOSHIFUJI Hideaki | 187e383 | 2008-06-04 13:01:37 +0900 | [diff] [blame] | 648 | return -ENODEV; |
Eric Dumazet | 536b2e9 | 2009-11-02 12:21:06 +0100 | [diff] [blame] | 649 | } |
| 650 | } else if (addr_type & IPV6_ADDR_LINKLOCAL) { |
| 651 | rcu_read_unlock(); |
YOSHIFUJI Hideaki | 187e383 | 2008-06-04 13:01:37 +0900 | [diff] [blame] | 652 | return -EINVAL; |
Eric Dumazet | 536b2e9 | 2009-11-02 12:21:06 +0100 | [diff] [blame] | 653 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 654 | |
YOSHIFUJI Hideaki | 187e383 | 2008-06-04 13:01:37 +0900 | [diff] [blame] | 655 | if (addr_type != IPV6_ADDR_ANY) { |
| 656 | int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; |
Maciej Żenczykowski | ec0506d | 2011-08-28 12:35:31 +0000 | [diff] [blame] | 657 | if (!inet_sk(sk)->transparent && |
| 658 | !ipv6_chk_addr(net, &src_info->ipi6_addr, |
YOSHIFUJI Hideaki | 187e383 | 2008-06-04 13:01:37 +0900 | [diff] [blame] | 659 | strict ? dev : NULL, 0)) |
| 660 | err = -EINVAL; |
| 661 | else |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 662 | ipv6_addr_copy(&fl6->saddr, &src_info->ipi6_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | } |
YOSHIFUJI Hideaki | 187e383 | 2008-06-04 13:01:37 +0900 | [diff] [blame] | 664 | |
Eric Dumazet | 536b2e9 | 2009-11-02 12:21:06 +0100 | [diff] [blame] | 665 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | |
YOSHIFUJI Hideaki | 187e383 | 2008-06-04 13:01:37 +0900 | [diff] [blame] | 667 | if (err) |
| 668 | goto exit_f; |
| 669 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | break; |
YOSHIFUJI Hideaki | 187e383 | 2008-06-04 13:01:37 +0900 | [diff] [blame] | 671 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
| 673 | case IPV6_FLOWINFO: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 674 | if (cmsg->cmsg_len < CMSG_LEN(4)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | err = -EINVAL; |
| 676 | goto exit_f; |
| 677 | } |
| 678 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 679 | if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { |
| 680 | if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | err = -EINVAL; |
| 682 | goto exit_f; |
| 683 | } |
| 684 | } |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 685 | fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | break; |
| 687 | |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 688 | case IPV6_2292HOPOPTS: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | case IPV6_HOPOPTS: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 690 | if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | err = -EINVAL; |
| 692 | goto exit_f; |
| 693 | } |
| 694 | |
| 695 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); |
| 696 | len = ((hdr->hdrlen + 1) << 3); |
| 697 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| 698 | err = -EINVAL; |
| 699 | goto exit_f; |
| 700 | } |
| 701 | if (!capable(CAP_NET_RAW)) { |
| 702 | err = -EPERM; |
| 703 | goto exit_f; |
| 704 | } |
| 705 | opt->opt_nflen += len; |
| 706 | opt->hopopt = hdr; |
| 707 | break; |
| 708 | |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 709 | case IPV6_2292DSTOPTS: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 710 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | err = -EINVAL; |
| 712 | goto exit_f; |
| 713 | } |
| 714 | |
| 715 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); |
| 716 | len = ((hdr->hdrlen + 1) << 3); |
| 717 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| 718 | err = -EINVAL; |
| 719 | goto exit_f; |
| 720 | } |
| 721 | if (!capable(CAP_NET_RAW)) { |
| 722 | err = -EPERM; |
| 723 | goto exit_f; |
| 724 | } |
| 725 | if (opt->dst1opt) { |
| 726 | err = -EINVAL; |
| 727 | goto exit_f; |
| 728 | } |
| 729 | opt->opt_flen += len; |
| 730 | opt->dst1opt = hdr; |
| 731 | break; |
| 732 | |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 733 | case IPV6_DSTOPTS: |
| 734 | case IPV6_RTHDRDSTOPTS: |
| 735 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
| 736 | err = -EINVAL; |
| 737 | goto exit_f; |
| 738 | } |
| 739 | |
| 740 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); |
| 741 | len = ((hdr->hdrlen + 1) << 3); |
| 742 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| 743 | err = -EINVAL; |
| 744 | goto exit_f; |
| 745 | } |
| 746 | if (!capable(CAP_NET_RAW)) { |
| 747 | err = -EPERM; |
| 748 | goto exit_f; |
| 749 | } |
| 750 | if (cmsg->cmsg_type == IPV6_DSTOPTS) { |
| 751 | opt->opt_flen += len; |
| 752 | opt->dst1opt = hdr; |
| 753 | } else { |
| 754 | opt->opt_nflen += len; |
| 755 | opt->dst0opt = hdr; |
| 756 | } |
| 757 | break; |
| 758 | |
| 759 | case IPV6_2292RTHDR: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | case IPV6_RTHDR: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 761 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | err = -EINVAL; |
| 763 | goto exit_f; |
| 764 | } |
| 765 | |
| 766 | rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); |
| 767 | |
Masahide NAKAMURA | 280a9d3 | 2006-08-23 19:17:12 -0700 | [diff] [blame] | 768 | switch (rthdr->type) { |
Masahide NAKAMURA | 59fbb3a6 | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 769 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | 280a9d3 | 2006-08-23 19:17:12 -0700 | [diff] [blame] | 770 | case IPV6_SRCRT_TYPE_2: |
Brian Haley | 6e093d9 | 2008-11-12 22:59:21 -0800 | [diff] [blame] | 771 | if (rthdr->hdrlen != 2 || |
| 772 | rthdr->segments_left != 1) { |
| 773 | err = -EINVAL; |
| 774 | goto exit_f; |
| 775 | } |
Masahide NAKAMURA | 280a9d3 | 2006-08-23 19:17:12 -0700 | [diff] [blame] | 776 | break; |
YOSHIFUJI Hideaki | bb4dbf9 | 2007-07-10 22:55:49 -0700 | [diff] [blame] | 777 | #endif |
Masahide NAKAMURA | 280a9d3 | 2006-08-23 19:17:12 -0700 | [diff] [blame] | 778 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | err = -EINVAL; |
| 780 | goto exit_f; |
| 781 | } |
| 782 | |
| 783 | len = ((rthdr->hdrlen + 1) << 3); |
| 784 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 785 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | err = -EINVAL; |
| 787 | goto exit_f; |
| 788 | } |
| 789 | |
| 790 | /* segments left must also match */ |
| 791 | if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { |
| 792 | err = -EINVAL; |
| 793 | goto exit_f; |
| 794 | } |
| 795 | |
| 796 | opt->opt_nflen += len; |
| 797 | opt->srcrt = rthdr; |
| 798 | |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 799 | if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); |
| 801 | |
| 802 | opt->opt_nflen += dsthdrlen; |
| 803 | opt->dst0opt = opt->dst1opt; |
| 804 | opt->dst1opt = NULL; |
| 805 | opt->opt_flen -= dsthdrlen; |
| 806 | } |
| 807 | |
| 808 | break; |
| 809 | |
YOSHIFUJI Hideaki | 333fad5 | 2005-09-08 09:59:17 +0900 | [diff] [blame] | 810 | case IPV6_2292HOPLIMIT: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | case IPV6_HOPLIMIT: |
| 812 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { |
| 813 | err = -EINVAL; |
| 814 | goto exit_f; |
| 815 | } |
| 816 | |
| 817 | *hlimit = *(int *)CMSG_DATA(cmsg); |
Shan Wei | e8766fc | 2008-06-10 15:50:55 +0800 | [diff] [blame] | 818 | if (*hlimit < -1 || *hlimit > 0xff) { |
| 819 | err = -EINVAL; |
| 820 | goto exit_f; |
| 821 | } |
| 822 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | break; |
| 824 | |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 825 | case IPV6_TCLASS: |
| 826 | { |
| 827 | int tc; |
| 828 | |
| 829 | err = -EINVAL; |
| 830 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { |
| 831 | goto exit_f; |
| 832 | } |
| 833 | |
| 834 | tc = *(int *)CMSG_DATA(cmsg); |
Remi Denis-Courmont | d0ee011 | 2006-09-13 20:08:07 -0700 | [diff] [blame] | 835 | if (tc < -1 || tc > 0xff) |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 836 | goto exit_f; |
| 837 | |
| 838 | err = 0; |
| 839 | *tclass = tc; |
| 840 | |
| 841 | break; |
| 842 | } |
Brian Haley | 13b52cd | 2010-04-23 11:26:08 +0000 | [diff] [blame] | 843 | |
| 844 | case IPV6_DONTFRAG: |
| 845 | { |
| 846 | int df; |
| 847 | |
| 848 | err = -EINVAL; |
| 849 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { |
| 850 | goto exit_f; |
| 851 | } |
| 852 | |
| 853 | df = *(int *)CMSG_DATA(cmsg); |
| 854 | if (df < 0 || df > 1) |
| 855 | goto exit_f; |
| 856 | |
| 857 | err = 0; |
| 858 | *dontfrag = df; |
| 859 | |
| 860 | break; |
| 861 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | default: |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 863 | LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n", |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 864 | cmsg->cmsg_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | err = -EINVAL; |
Miao Xie | 4a36702 | 2008-07-29 23:57:58 -0700 | [diff] [blame] | 866 | goto exit_f; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 867 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | } |
| 869 | |
| 870 | exit_f: |
| 871 | return err; |
| 872 | } |