YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * xfrm4_policy.c |
| 3 | * |
| 4 | * Changes: |
| 5 | * Kazunori MIYAZAWA @USAGI |
| 6 | * YOSHIFUJI Hideaki @USAGI |
| 7 | * Split up af-specific portion |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 8 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
Herbert Xu | 66cdb3c | 2007-11-13 21:37:28 -0800 | [diff] [blame] | 11 | #include <linux/err.h> |
| 12 | #include <linux/kernel.h> |
Herbert Xu | aabc976 | 2005-05-03 16:27:10 -0700 | [diff] [blame] | 13 | #include <linux/inetdevice.h> |
Timo Teräs | cc9ff19 | 2010-11-03 04:41:38 +0000 | [diff] [blame] | 14 | #include <linux/if_tunnel.h> |
Herbert Xu | 45ff5a3 | 2007-11-13 21:35:32 -0800 | [diff] [blame] | 15 | #include <net/dst.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <net/xfrm.h> |
| 17 | #include <net/ip.h> |
David Ahern | 385add9 | 2015-09-29 20:07:13 -0700 | [diff] [blame] | 18 | #include <net/l3mdev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | static struct xfrm_policy_afinfo xfrm4_policy_afinfo; |
| 21 | |
David S. Miller | 8f01cb0 | 2011-05-09 15:13:28 -0700 | [diff] [blame] | 22 | static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4, |
David Ahern | 42a7b32 | 2015-08-10 16:58:11 -0600 | [diff] [blame] | 23 | int tos, int oif, |
David S. Miller | 8f01cb0 | 2011-05-09 15:13:28 -0700 | [diff] [blame] | 24 | const xfrm_address_t *saddr, |
Lorenzo Colitti | 34e23de | 2017-08-11 02:11:33 +0900 | [diff] [blame] | 25 | const xfrm_address_t *daddr, |
| 26 | u32 mark) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | { |
Herbert Xu | 66cdb3c | 2007-11-13 21:37:28 -0800 | [diff] [blame] | 28 | struct rtable *rt; |
Patrick McHardy | a1e59ab | 2006-09-19 12:57:34 -0700 | [diff] [blame] | 29 | |
David S. Miller | 8f01cb0 | 2011-05-09 15:13:28 -0700 | [diff] [blame] | 30 | memset(fl4, 0, sizeof(*fl4)); |
| 31 | fl4->daddr = daddr->a4; |
| 32 | fl4->flowi4_tos = tos; |
David Ahern | 11d7a0b | 2016-08-14 19:52:56 -0700 | [diff] [blame] | 33 | fl4->flowi4_oif = l3mdev_master_ifindex_by_index(net, oif); |
Lorenzo Colitti | 34e23de | 2017-08-11 02:11:33 +0900 | [diff] [blame] | 34 | fl4->flowi4_mark = mark; |
Herbert Xu | 66cdb3c | 2007-11-13 21:37:28 -0800 | [diff] [blame] | 35 | if (saddr) |
David S. Miller | 8f01cb0 | 2011-05-09 15:13:28 -0700 | [diff] [blame] | 36 | fl4->saddr = saddr->a4; |
Herbert Xu | 66cdb3c | 2007-11-13 21:37:28 -0800 | [diff] [blame] | 37 | |
David Ahern | 58189ca | 2015-09-15 15:10:50 -0700 | [diff] [blame] | 38 | fl4->flowi4_flags = FLOWI_FLAG_SKIP_NH_OIF; |
| 39 | |
David S. Miller | 8f01cb0 | 2011-05-09 15:13:28 -0700 | [diff] [blame] | 40 | rt = __ip_route_output_key(net, fl4); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 41 | if (!IS_ERR(rt)) |
| 42 | return &rt->dst; |
| 43 | |
| 44 | return ERR_CAST(rt); |
Herbert Xu | 66cdb3c | 2007-11-13 21:37:28 -0800 | [diff] [blame] | 45 | } |
| 46 | |
David Ahern | 42a7b32 | 2015-08-10 16:58:11 -0600 | [diff] [blame] | 47 | static struct dst_entry *xfrm4_dst_lookup(struct net *net, int tos, int oif, |
David S. Miller | 8f01cb0 | 2011-05-09 15:13:28 -0700 | [diff] [blame] | 48 | const xfrm_address_t *saddr, |
Lorenzo Colitti | 34e23de | 2017-08-11 02:11:33 +0900 | [diff] [blame] | 49 | const xfrm_address_t *daddr, |
| 50 | u32 mark) |
David S. Miller | 8f01cb0 | 2011-05-09 15:13:28 -0700 | [diff] [blame] | 51 | { |
| 52 | struct flowi4 fl4; |
| 53 | |
Lorenzo Colitti | 34e23de | 2017-08-11 02:11:33 +0900 | [diff] [blame] | 54 | return __xfrm4_dst_lookup(net, &fl4, tos, oif, saddr, daddr, mark); |
David S. Miller | 8f01cb0 | 2011-05-09 15:13:28 -0700 | [diff] [blame] | 55 | } |
| 56 | |
David Ahern | 42a7b32 | 2015-08-10 16:58:11 -0600 | [diff] [blame] | 57 | static int xfrm4_get_saddr(struct net *net, int oif, |
Lorenzo Colitti | 34e23de | 2017-08-11 02:11:33 +0900 | [diff] [blame] | 58 | xfrm_address_t *saddr, xfrm_address_t *daddr, |
| 59 | u32 mark) |
Herbert Xu | 66cdb3c | 2007-11-13 21:37:28 -0800 | [diff] [blame] | 60 | { |
| 61 | struct dst_entry *dst; |
David S. Miller | 8f01cb0 | 2011-05-09 15:13:28 -0700 | [diff] [blame] | 62 | struct flowi4 fl4; |
Herbert Xu | 66cdb3c | 2007-11-13 21:37:28 -0800 | [diff] [blame] | 63 | |
Lorenzo Colitti | 34e23de | 2017-08-11 02:11:33 +0900 | [diff] [blame] | 64 | dst = __xfrm4_dst_lookup(net, &fl4, 0, oif, NULL, daddr, mark); |
Herbert Xu | 66cdb3c | 2007-11-13 21:37:28 -0800 | [diff] [blame] | 65 | if (IS_ERR(dst)) |
| 66 | return -EHOSTUNREACH; |
| 67 | |
David S. Miller | 8f01cb0 | 2011-05-09 15:13:28 -0700 | [diff] [blame] | 68 | saddr->a4 = fl4.saddr; |
Herbert Xu | 66cdb3c | 2007-11-13 21:37:28 -0800 | [diff] [blame] | 69 | dst_release(dst); |
| 70 | return 0; |
Patrick McHardy | a1e59ab | 2006-09-19 12:57:34 -0700 | [diff] [blame] | 71 | } |
| 72 | |
David S. Miller | 05d8402 | 2011-02-22 17:47:10 -0800 | [diff] [blame] | 73 | static int xfrm4_get_tos(const struct flowi *fl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | { |
David S. Miller | 7e1dc7b | 2011-03-12 02:42:11 -0500 | [diff] [blame] | 75 | return IPTOS_RT_MASK & fl->u.ip4.flowi4_tos; /* Strip ECN bits */ |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 76 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
Masahide NAKAMURA | a1b0514 | 2007-12-20 20:41:12 -0800 | [diff] [blame] | 78 | static int xfrm4_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
| 79 | int nfheader_len) |
| 80 | { |
| 81 | return 0; |
| 82 | } |
| 83 | |
Herbert Xu | 87c1e12 | 2010-03-02 02:51:56 +0000 | [diff] [blame] | 84 | static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
David S. Miller | 0c7b3ee | 2011-02-22 17:48:57 -0800 | [diff] [blame] | 85 | const struct flowi *fl) |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 86 | { |
| 87 | struct rtable *rt = (struct rtable *)xdst->route; |
David S. Miller | 7e1dc7b | 2011-03-12 02:42:11 -0500 | [diff] [blame] | 88 | const struct flowi4 *fl4 = &fl->u.ip4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Yan, Zheng | b732339 | 2011-10-22 21:58:20 +0000 | [diff] [blame] | 90 | xdst->u.rt.rt_iif = fl4->flowi4_iif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 92 | xdst->u.dst.dev = dev; |
| 93 | dev_hold(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 95 | /* Sheit... I remember I did this right. Apparently, |
| 96 | * it was magically lost, so this code needs audit */ |
David S. Miller | 9917e1e8 | 2012-07-17 14:44:26 -0700 | [diff] [blame] | 97 | xdst->u.rt.rt_is_input = rt->rt_is_input; |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 98 | xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | |
| 99 | RTCF_LOCAL); |
| 100 | xdst->u.rt.rt_type = rt->rt_type; |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 101 | xdst->u.rt.rt_gateway = rt->rt_gateway; |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 102 | xdst->u.rt.rt_uses_gateway = rt->rt_uses_gateway; |
David S. Miller | 5943634 | 2012-07-10 06:58:42 -0700 | [diff] [blame] | 103 | xdst->u.rt.rt_pmtu = rt->rt_pmtu; |
David Ahern | b7503e0 | 2015-09-02 13:58:35 -0700 | [diff] [blame] | 104 | xdst->u.rt.rt_table_id = rt->rt_table_id; |
David S. Miller | caacf05 | 2012-07-31 15:06:50 -0700 | [diff] [blame] | 105 | INIT_LIST_HEAD(&xdst->u.rt.rt_uncached); |
Miika Komu | 4337226 | 2007-02-06 14:27:32 -0800 | [diff] [blame] | 106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | } |
| 109 | |
| 110 | static void |
Herbert Xu | d5422ef | 2007-12-12 10:44:16 -0800 | [diff] [blame] | 111 | _decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 113 | const struct iphdr *iph = ip_hdr(skb); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 114 | u8 *xprth = skb_network_header(skb) + iph->ihl * 4; |
David S. Miller | 7e1dc7b | 2011-03-12 02:42:11 -0500 | [diff] [blame] | 115 | struct flowi4 *fl4 = &fl->u.ip4; |
Steffen Klassert | 84502b5 | 2013-10-30 11:16:28 +0100 | [diff] [blame] | 116 | int oif = 0; |
| 117 | |
David Ahern | 385add9 | 2015-09-29 20:07:13 -0700 | [diff] [blame] | 118 | if (skb_dst(skb)) |
David Ahern | e0d56fd | 2016-09-10 12:09:57 -0700 | [diff] [blame] | 119 | oif = skb_dst(skb)->dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
David S. Miller | 7e1dc7b | 2011-03-12 02:42:11 -0500 | [diff] [blame] | 121 | memset(fl4, 0, sizeof(struct flowi4)); |
| 122 | fl4->flowi4_mark = skb->mark; |
Steffen Klassert | 84502b5 | 2013-10-30 11:16:28 +0100 | [diff] [blame] | 123 | fl4->flowi4_oif = reverse ? skb->skb_iif : oif; |
Peter Kosyh | 44b451f | 2010-07-02 07:47:55 +0000 | [diff] [blame] | 124 | |
Paul Gortmaker | 56f8a75 | 2011-06-21 20:33:34 -0700 | [diff] [blame] | 125 | if (!ip_is_fragment(iph)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | switch (iph->protocol) { |
| 127 | case IPPROTO_UDP: |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 128 | case IPPROTO_UDPLITE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | case IPPROTO_TCP: |
| 130 | case IPPROTO_SCTP: |
Patrick McHardy | 9e99999 | 2005-12-19 14:03:46 -0800 | [diff] [blame] | 131 | case IPPROTO_DCCP: |
Wei Yongjun | c615c9f | 2009-07-02 16:57:23 +0000 | [diff] [blame] | 132 | if (xprth + 4 < skb->data || |
| 133 | pskb_may_pull(skb, xprth + 4 - skb->data)) { |
Steffen Klassert | ea673a4 | 2015-10-23 07:32:39 +0200 | [diff] [blame] | 134 | __be16 *ports; |
| 135 | |
| 136 | xprth = skb_network_header(skb) + iph->ihl * 4; |
| 137 | ports = (__be16 *)xprth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | |
David S. Miller | 9cce96d | 2011-03-12 03:00:33 -0500 | [diff] [blame] | 139 | fl4->fl4_sport = ports[!!reverse]; |
| 140 | fl4->fl4_dport = ports[!reverse]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | } |
| 142 | break; |
| 143 | |
| 144 | case IPPROTO_ICMP: |
Steffen Klassert | 1a14f1e | 2015-10-23 07:31:23 +0200 | [diff] [blame] | 145 | if (xprth + 2 < skb->data || |
| 146 | pskb_may_pull(skb, xprth + 2 - skb->data)) { |
Steffen Klassert | ea673a4 | 2015-10-23 07:32:39 +0200 | [diff] [blame] | 147 | u8 *icmp; |
| 148 | |
| 149 | xprth = skb_network_header(skb) + iph->ihl * 4; |
| 150 | icmp = xprth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
David S. Miller | 9cce96d | 2011-03-12 03:00:33 -0500 | [diff] [blame] | 152 | fl4->fl4_icmp_type = icmp[0]; |
| 153 | fl4->fl4_icmp_code = icmp[1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
| 155 | break; |
| 156 | |
| 157 | case IPPROTO_ESP: |
Steffen Klassert | 1a14f1e | 2015-10-23 07:31:23 +0200 | [diff] [blame] | 158 | if (xprth + 4 < skb->data || |
| 159 | pskb_may_pull(skb, xprth + 4 - skb->data)) { |
Steffen Klassert | ea673a4 | 2015-10-23 07:32:39 +0200 | [diff] [blame] | 160 | __be32 *ehdr; |
| 161 | |
| 162 | xprth = skb_network_header(skb) + iph->ihl * 4; |
| 163 | ehdr = (__be32 *)xprth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | |
David S. Miller | 9cce96d | 2011-03-12 03:00:33 -0500 | [diff] [blame] | 165 | fl4->fl4_ipsec_spi = ehdr[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | } |
| 167 | break; |
| 168 | |
| 169 | case IPPROTO_AH: |
Steffen Klassert | 1a14f1e | 2015-10-23 07:31:23 +0200 | [diff] [blame] | 170 | if (xprth + 8 < skb->data || |
| 171 | pskb_may_pull(skb, xprth + 8 - skb->data)) { |
Steffen Klassert | ea673a4 | 2015-10-23 07:32:39 +0200 | [diff] [blame] | 172 | __be32 *ah_hdr; |
| 173 | |
| 174 | xprth = skb_network_header(skb) + iph->ihl * 4; |
| 175 | ah_hdr = (__be32 *)xprth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
David S. Miller | 9cce96d | 2011-03-12 03:00:33 -0500 | [diff] [blame] | 177 | fl4->fl4_ipsec_spi = ah_hdr[1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | } |
| 179 | break; |
| 180 | |
| 181 | case IPPROTO_COMP: |
Steffen Klassert | 1a14f1e | 2015-10-23 07:31:23 +0200 | [diff] [blame] | 182 | if (xprth + 4 < skb->data || |
| 183 | pskb_may_pull(skb, xprth + 4 - skb->data)) { |
Steffen Klassert | ea673a4 | 2015-10-23 07:32:39 +0200 | [diff] [blame] | 184 | __be16 *ipcomp_hdr; |
| 185 | |
| 186 | xprth = skb_network_header(skb) + iph->ihl * 4; |
| 187 | ipcomp_hdr = (__be16 *)xprth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
David S. Miller | 9cce96d | 2011-03-12 03:00:33 -0500 | [diff] [blame] | 189 | fl4->fl4_ipsec_spi = htonl(ntohs(ipcomp_hdr[1])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
| 191 | break; |
Timo Teräs | cc9ff19 | 2010-11-03 04:41:38 +0000 | [diff] [blame] | 192 | |
| 193 | case IPPROTO_GRE: |
Steffen Klassert | 1a14f1e | 2015-10-23 07:31:23 +0200 | [diff] [blame] | 194 | if (xprth + 12 < skb->data || |
| 195 | pskb_may_pull(skb, xprth + 12 - skb->data)) { |
Steffen Klassert | ea673a4 | 2015-10-23 07:32:39 +0200 | [diff] [blame] | 196 | __be16 *greflags; |
| 197 | __be32 *gre_hdr; |
| 198 | |
| 199 | xprth = skb_network_header(skb) + iph->ihl * 4; |
| 200 | greflags = (__be16 *)xprth; |
| 201 | gre_hdr = (__be32 *)xprth; |
Timo Teräs | cc9ff19 | 2010-11-03 04:41:38 +0000 | [diff] [blame] | 202 | |
| 203 | if (greflags[0] & GRE_KEY) { |
| 204 | if (greflags[0] & GRE_CSUM) |
| 205 | gre_hdr++; |
David S. Miller | 9cce96d | 2011-03-12 03:00:33 -0500 | [diff] [blame] | 206 | fl4->fl4_gre_key = gre_hdr[1]; |
Timo Teräs | cc9ff19 | 2010-11-03 04:41:38 +0000 | [diff] [blame] | 207 | } |
| 208 | } |
| 209 | break; |
| 210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | default: |
David S. Miller | 9cce96d | 2011-03-12 03:00:33 -0500 | [diff] [blame] | 212 | fl4->fl4_ipsec_spi = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 214 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | } |
David S. Miller | 7e1dc7b | 2011-03-12 02:42:11 -0500 | [diff] [blame] | 216 | fl4->flowi4_proto = iph->protocol; |
| 217 | fl4->daddr = reverse ? iph->saddr : iph->daddr; |
| 218 | fl4->saddr = reverse ? iph->daddr : iph->saddr; |
| 219 | fl4->flowi4_tos = iph->tos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | } |
| 221 | |
Daniel Lezcano | 569d364 | 2008-01-18 03:56:57 -0800 | [diff] [blame] | 222 | static inline int xfrm4_garbage_collect(struct dst_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | { |
Alexey Dobriyan | d7c7544 | 2010-01-24 22:47:53 -0800 | [diff] [blame] | 224 | struct net *net = container_of(ops, struct net, xfrm.xfrm4_dst_ops); |
| 225 | |
| 226 | xfrm4_policy_afinfo.garbage_collect(net); |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 227 | return (dst_entries_get_slow(ops) > ops->gc_thresh * 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | } |
| 229 | |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 230 | static void xfrm4_update_pmtu(struct dst_entry *dst, struct sock *sk, |
| 231 | struct sk_buff *skb, u32 mtu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | { |
| 233 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| 234 | struct dst_entry *path = xdst->route; |
| 235 | |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 236 | path->ops->update_pmtu(path, sk, skb, mtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | } |
| 238 | |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 239 | static void xfrm4_redirect(struct dst_entry *dst, struct sock *sk, |
| 240 | struct sk_buff *skb) |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 241 | { |
| 242 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| 243 | struct dst_entry *path = xdst->route; |
| 244 | |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 245 | path->ops->redirect(path, sk, skb); |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 246 | } |
| 247 | |
Herbert Xu | aabc976 | 2005-05-03 16:27:10 -0700 | [diff] [blame] | 248 | static void xfrm4_dst_destroy(struct dst_entry *dst) |
| 249 | { |
| 250 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; |
| 251 | |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 252 | dst_destroy_metrics_generic(dst); |
| 253 | |
Herbert Xu | aabc976 | 2005-05-03 16:27:10 -0700 | [diff] [blame] | 254 | xfrm_dst_destroy(xdst); |
| 255 | } |
| 256 | |
| 257 | static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
| 258 | int unregister) |
| 259 | { |
Herbert Xu | aabc976 | 2005-05-03 16:27:10 -0700 | [diff] [blame] | 260 | if (!unregister) |
| 261 | return; |
| 262 | |
Herbert Xu | aabc976 | 2005-05-03 16:27:10 -0700 | [diff] [blame] | 263 | xfrm_dst_ifdown(dst, dev); |
| 264 | } |
| 265 | |
Dan Streetman | a8a572a | 2015-10-29 09:51:16 -0400 | [diff] [blame] | 266 | static struct dst_ops xfrm4_dst_ops_template = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | .family = AF_INET, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | .gc = xfrm4_garbage_collect, |
| 269 | .update_pmtu = xfrm4_update_pmtu, |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 270 | .redirect = xfrm4_redirect, |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 271 | .cow_metrics = dst_cow_metrics_generic, |
Herbert Xu | aabc976 | 2005-05-03 16:27:10 -0700 | [diff] [blame] | 272 | .destroy = xfrm4_dst_destroy, |
| 273 | .ifdown = xfrm4_dst_ifdown, |
Herbert Xu | 862b82c | 2007-11-13 21:43:11 -0800 | [diff] [blame] | 274 | .local_out = __ip_local_out, |
Steffen Klassert | c386578 | 2015-09-29 11:40:49 +0200 | [diff] [blame] | 275 | .gc_thresh = INT_MAX, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | }; |
| 277 | |
| 278 | static struct xfrm_policy_afinfo xfrm4_policy_afinfo = { |
| 279 | .family = AF_INET, |
Dan Streetman | a8a572a | 2015-10-29 09:51:16 -0400 | [diff] [blame] | 280 | .dst_ops = &xfrm4_dst_ops_template, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | .dst_lookup = xfrm4_dst_lookup, |
Patrick McHardy | a1e59ab | 2006-09-19 12:57:34 -0700 | [diff] [blame] | 282 | .get_saddr = xfrm4_get_saddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | .decode_session = _decode_session4, |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 284 | .get_tos = xfrm4_get_tos, |
Masahide NAKAMURA | a1b0514 | 2007-12-20 20:41:12 -0800 | [diff] [blame] | 285 | .init_path = xfrm4_init_path, |
Herbert Xu | 25ee328 | 2007-12-11 09:32:34 -0800 | [diff] [blame] | 286 | .fill_dst = xfrm4_fill_dst, |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 287 | .blackhole_route = ipv4_blackhole_route, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | }; |
| 289 | |
Randy Dunlap | f816700 | 2009-08-04 20:18:33 -0700 | [diff] [blame] | 290 | #ifdef CONFIG_SYSCTL |
Neil Horman | a44a4a0 | 2009-07-27 08:22:46 +0000 | [diff] [blame] | 291 | static struct ctl_table xfrm4_policy_table[] = { |
| 292 | { |
Neil Horman | a44a4a0 | 2009-07-27 08:22:46 +0000 | [diff] [blame] | 293 | .procname = "xfrm4_gc_thresh", |
Alexey Dobriyan | d7c7544 | 2010-01-24 22:47:53 -0800 | [diff] [blame] | 294 | .data = &init_net.xfrm.xfrm4_dst_ops.gc_thresh, |
Neil Horman | a44a4a0 | 2009-07-27 08:22:46 +0000 | [diff] [blame] | 295 | .maxlen = sizeof(int), |
| 296 | .mode = 0644, |
| 297 | .proc_handler = proc_dointvec, |
| 298 | }, |
| 299 | { } |
| 300 | }; |
| 301 | |
Arnd Bergmann | 318d3cc | 2016-06-16 15:59:25 +0200 | [diff] [blame] | 302 | static __net_init int xfrm4_net_sysctl_init(struct net *net) |
Michal Kubecek | 8d06887 | 2013-02-06 10:46:33 +0100 | [diff] [blame] | 303 | { |
| 304 | struct ctl_table *table; |
| 305 | struct ctl_table_header *hdr; |
| 306 | |
| 307 | table = xfrm4_policy_table; |
| 308 | if (!net_eq(net, &init_net)) { |
| 309 | table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL); |
| 310 | if (!table) |
| 311 | goto err_alloc; |
| 312 | |
| 313 | table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh; |
| 314 | } |
| 315 | |
| 316 | hdr = register_net_sysctl(net, "net/ipv4", table); |
| 317 | if (!hdr) |
| 318 | goto err_reg; |
| 319 | |
| 320 | net->ipv4.xfrm4_hdr = hdr; |
| 321 | return 0; |
| 322 | |
| 323 | err_reg: |
| 324 | if (!net_eq(net, &init_net)) |
| 325 | kfree(table); |
| 326 | err_alloc: |
| 327 | return -ENOMEM; |
| 328 | } |
| 329 | |
Arnd Bergmann | 318d3cc | 2016-06-16 15:59:25 +0200 | [diff] [blame] | 330 | static __net_exit void xfrm4_net_sysctl_exit(struct net *net) |
Michal Kubecek | 8d06887 | 2013-02-06 10:46:33 +0100 | [diff] [blame] | 331 | { |
| 332 | struct ctl_table *table; |
| 333 | |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 334 | if (!net->ipv4.xfrm4_hdr) |
Michal Kubecek | 8d06887 | 2013-02-06 10:46:33 +0100 | [diff] [blame] | 335 | return; |
| 336 | |
| 337 | table = net->ipv4.xfrm4_hdr->ctl_table_arg; |
| 338 | unregister_net_sysctl_table(net->ipv4.xfrm4_hdr); |
| 339 | if (!net_eq(net, &init_net)) |
| 340 | kfree(table); |
| 341 | } |
Dan Streetman | a8a572a | 2015-10-29 09:51:16 -0400 | [diff] [blame] | 342 | #else /* CONFIG_SYSCTL */ |
Arnd Bergmann | 318d3cc | 2016-06-16 15:59:25 +0200 | [diff] [blame] | 343 | static inline int xfrm4_net_sysctl_init(struct net *net) |
Dan Streetman | a8a572a | 2015-10-29 09:51:16 -0400 | [diff] [blame] | 344 | { |
| 345 | return 0; |
| 346 | } |
| 347 | |
Arnd Bergmann | 318d3cc | 2016-06-16 15:59:25 +0200 | [diff] [blame] | 348 | static inline void xfrm4_net_sysctl_exit(struct net *net) |
Dan Streetman | a8a572a | 2015-10-29 09:51:16 -0400 | [diff] [blame] | 349 | { |
| 350 | } |
| 351 | #endif |
| 352 | |
| 353 | static int __net_init xfrm4_net_init(struct net *net) |
| 354 | { |
| 355 | int ret; |
| 356 | |
| 357 | memcpy(&net->xfrm.xfrm4_dst_ops, &xfrm4_dst_ops_template, |
| 358 | sizeof(xfrm4_dst_ops_template)); |
| 359 | ret = dst_entries_init(&net->xfrm.xfrm4_dst_ops); |
| 360 | if (ret) |
| 361 | return ret; |
| 362 | |
| 363 | ret = xfrm4_net_sysctl_init(net); |
| 364 | if (ret) |
| 365 | dst_entries_destroy(&net->xfrm.xfrm4_dst_ops); |
| 366 | |
| 367 | return ret; |
| 368 | } |
| 369 | |
| 370 | static void __net_exit xfrm4_net_exit(struct net *net) |
| 371 | { |
| 372 | xfrm4_net_sysctl_exit(net); |
| 373 | dst_entries_destroy(&net->xfrm.xfrm4_dst_ops); |
| 374 | } |
Michal Kubecek | 8d06887 | 2013-02-06 10:46:33 +0100 | [diff] [blame] | 375 | |
| 376 | static struct pernet_operations __net_initdata xfrm4_net_ops = { |
| 377 | .init = xfrm4_net_init, |
| 378 | .exit = xfrm4_net_exit, |
| 379 | }; |
Neil Horman | a44a4a0 | 2009-07-27 08:22:46 +0000 | [diff] [blame] | 380 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | static void __init xfrm4_policy_init(void) |
| 382 | { |
| 383 | xfrm_policy_register_afinfo(&xfrm4_policy_afinfo); |
| 384 | } |
| 385 | |
Steffen Klassert | 703fb94 | 2012-11-13 08:52:24 +0100 | [diff] [blame] | 386 | void __init xfrm4_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | { |
Alexey Dobriyan | d7c7544 | 2010-01-24 22:47:53 -0800 | [diff] [blame] | 388 | xfrm4_state_init(); |
| 389 | xfrm4_policy_init(); |
Steffen Klassert | 2f32b51 | 2014-03-14 07:28:07 +0100 | [diff] [blame] | 390 | xfrm4_protocol_init(); |
Michal Kubecek | 8d06887 | 2013-02-06 10:46:33 +0100 | [diff] [blame] | 391 | register_pernet_subsys(&xfrm4_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | } |
| 393 | |