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387aa65a89
This reverts commit 05ab86c5
(xfrm4: Invalidate all ipv4 routes on
IPsec pmtu events). Flushing all cached entries is not needed.
Instead, invalidate only the related next hop dsts to recheck for
the added next hop exception where needed. This also fixes a subtle
race due to bumping generation id's before updating the pmtu.
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
196 lines
4.5 KiB
C
196 lines
4.5 KiB
C
/*
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* IP Payload Compression Protocol (IPComp) - RFC3173.
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*
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* Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* Todo:
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* - Tunable compression parameters.
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* - Compression stats.
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* - Adaptive compression.
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/rtnetlink.h>
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#include <net/ip.h>
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#include <net/xfrm.h>
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#include <net/icmp.h>
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#include <net/ipcomp.h>
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#include <net/protocol.h>
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#include <net/sock.h>
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static void ipcomp4_err(struct sk_buff *skb, u32 info)
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{
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struct net *net = dev_net(skb->dev);
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__be32 spi;
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const struct iphdr *iph = (const struct iphdr *)skb->data;
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struct ip_comp_hdr *ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
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struct xfrm_state *x;
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switch (icmp_hdr(skb)->type) {
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case ICMP_DEST_UNREACH:
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if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
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return;
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case ICMP_REDIRECT:
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break;
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default:
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return;
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}
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spi = htonl(ntohs(ipch->cpi));
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x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
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spi, IPPROTO_COMP, AF_INET);
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if (!x)
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return;
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if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
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ipv4_update_pmtu(skb, net, info, 0, 0, IPPROTO_COMP, 0);
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else
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ipv4_redirect(skb, net, 0, 0, IPPROTO_COMP, 0);
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xfrm_state_put(x);
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}
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/* We always hold one tunnel user reference to indicate a tunnel */
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static struct xfrm_state *ipcomp_tunnel_create(struct xfrm_state *x)
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{
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struct net *net = xs_net(x);
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struct xfrm_state *t;
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t = xfrm_state_alloc(net);
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if (t == NULL)
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goto out;
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t->id.proto = IPPROTO_IPIP;
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t->id.spi = x->props.saddr.a4;
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t->id.daddr.a4 = x->id.daddr.a4;
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memcpy(&t->sel, &x->sel, sizeof(t->sel));
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t->props.family = AF_INET;
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t->props.mode = x->props.mode;
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t->props.saddr.a4 = x->props.saddr.a4;
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t->props.flags = x->props.flags;
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t->props.extra_flags = x->props.extra_flags;
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memcpy(&t->mark, &x->mark, sizeof(t->mark));
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if (xfrm_init_state(t))
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goto error;
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atomic_set(&t->tunnel_users, 1);
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out:
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return t;
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error:
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t->km.state = XFRM_STATE_DEAD;
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xfrm_state_put(t);
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t = NULL;
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goto out;
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}
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/*
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* Must be protected by xfrm_cfg_mutex. State and tunnel user references are
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* always incremented on success.
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*/
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static int ipcomp_tunnel_attach(struct xfrm_state *x)
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{
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struct net *net = xs_net(x);
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int err = 0;
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struct xfrm_state *t;
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u32 mark = x->mark.v & x->mark.m;
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t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr.a4,
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x->props.saddr.a4, IPPROTO_IPIP, AF_INET);
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if (!t) {
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t = ipcomp_tunnel_create(x);
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if (!t) {
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err = -EINVAL;
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goto out;
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}
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xfrm_state_insert(t);
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xfrm_state_hold(t);
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}
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x->tunnel = t;
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atomic_inc(&t->tunnel_users);
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out:
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return err;
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}
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static int ipcomp4_init_state(struct xfrm_state *x)
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{
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int err = -EINVAL;
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x->props.header_len = 0;
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switch (x->props.mode) {
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case XFRM_MODE_TRANSPORT:
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break;
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case XFRM_MODE_TUNNEL:
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x->props.header_len += sizeof(struct iphdr);
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break;
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default:
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goto out;
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}
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err = ipcomp_init_state(x);
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if (err)
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goto out;
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if (x->props.mode == XFRM_MODE_TUNNEL) {
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err = ipcomp_tunnel_attach(x);
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if (err)
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goto out;
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}
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err = 0;
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out:
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return err;
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}
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static const struct xfrm_type ipcomp_type = {
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.description = "IPCOMP4",
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.owner = THIS_MODULE,
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.proto = IPPROTO_COMP,
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.init_state = ipcomp4_init_state,
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.destructor = ipcomp_destroy,
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.input = ipcomp_input,
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.output = ipcomp_output
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};
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static const struct net_protocol ipcomp4_protocol = {
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.handler = xfrm4_rcv,
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.err_handler = ipcomp4_err,
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.no_policy = 1,
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.netns_ok = 1,
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};
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static int __init ipcomp4_init(void)
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{
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if (xfrm_register_type(&ipcomp_type, AF_INET) < 0) {
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pr_info("%s: can't add xfrm type\n", __func__);
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return -EAGAIN;
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}
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if (inet_add_protocol(&ipcomp4_protocol, IPPROTO_COMP) < 0) {
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pr_info("%s: can't add protocol\n", __func__);
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xfrm_unregister_type(&ipcomp_type, AF_INET);
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return -EAGAIN;
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}
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return 0;
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}
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static void __exit ipcomp4_fini(void)
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{
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if (inet_del_protocol(&ipcomp4_protocol, IPPROTO_COMP) < 0)
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pr_info("%s: can't remove protocol\n", __func__);
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if (xfrm_unregister_type(&ipcomp_type, AF_INET) < 0)
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pr_info("%s: can't remove xfrm type\n", __func__);
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}
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module_init(ipcomp4_init);
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module_exit(ipcomp4_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp/IPv4) - RFC3173");
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MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
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MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_COMP);
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