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Diffstat (limited to 'net/ipv6/seg6.c')
-rw-r--r--net/ipv6/seg6.c155
1 files changed, 100 insertions, 55 deletions
diff --git a/net/ipv6/seg6.c b/net/ipv6/seg6.c
index 8d0ba757a46c..a5c4c629b788 100644
--- a/net/ipv6/seg6.c
+++ b/net/ipv6/seg6.c
@@ -1,14 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SR-IPv6 implementation
*
* Author:
* David Lebrun <david.lebrun@uclouvain.be>
- *
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
*/
#include <linux/errno.h>
@@ -26,14 +21,13 @@
#include <net/genetlink.h>
#include <linux/seg6.h>
#include <linux/seg6_genl.h>
-#ifdef CONFIG_IPV6_SEG6_HMAC
#include <net/seg6_hmac.h>
-#endif
-bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len)
+bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduced)
{
- int trailing;
unsigned int tlv_offset;
+ int max_last_entry;
+ int trailing;
if (srh->type != IPV6_SRCRT_TYPE_4)
return false;
@@ -41,8 +35,17 @@ bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len)
if (((srh->hdrlen + 1) << 3) != len)
return false;
- if (srh->segments_left > srh->first_segment)
+ if (!reduced && srh->segments_left > srh->first_segment) {
return false;
+ } else {
+ max_last_entry = (srh->hdrlen / 2) - 1;
+
+ if (srh->first_segment > max_last_entry)
+ return false;
+
+ if (srh->segments_left > srh->first_segment + 1)
+ return false;
+ }
tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4);
@@ -70,6 +73,65 @@ bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len)
return true;
}
+struct ipv6_sr_hdr *seg6_get_srh(struct sk_buff *skb, int flags)
+{
+ struct ipv6_sr_hdr *srh;
+ int len, srhoff = 0;
+
+ if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, &flags) < 0)
+ return NULL;
+
+ if (!pskb_may_pull(skb, srhoff + sizeof(*srh)))
+ return NULL;
+
+ srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
+
+ len = (srh->hdrlen + 1) << 3;
+
+ if (!pskb_may_pull(skb, srhoff + len))
+ return NULL;
+
+ /* note that pskb_may_pull may change pointers in header;
+ * for this reason it is necessary to reload them when needed.
+ */
+ srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
+
+ if (!seg6_validate_srh(srh, len, true))
+ return NULL;
+
+ return srh;
+}
+
+/* Determine if an ICMP invoking packet contains a segment routing
+ * header. If it does, extract the offset to the true destination
+ * address, which is in the first segment address.
+ */
+void seg6_icmp_srh(struct sk_buff *skb, struct inet6_skb_parm *opt)
+{
+ __u16 network_header = skb->network_header;
+ struct ipv6_sr_hdr *srh;
+
+ /* Update network header to point to the invoking packet
+ * inside the ICMP packet, so we can use the seg6_get_srh()
+ * helper.
+ */
+ skb_reset_network_header(skb);
+
+ srh = seg6_get_srh(skb, 0);
+ if (!srh)
+ goto out;
+
+ if (srh->type != IPV6_SRCRT_TYPE_4)
+ goto out;
+
+ opt->flags |= IP6SKB_SEG6;
+ opt->srhoff = (unsigned char *)srh - skb->data;
+
+out:
+ /* Restore the network header back to the ICMP packet */
+ skb->network_header = network_header;
+}
+
static struct genl_family seg6_genl_family;
static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = {
@@ -117,9 +179,6 @@ static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
hinfo = seg6_hmac_info_lookup(net, hmackeyid);
if (!slen) {
- if (!hinfo)
- err = -ENOENT;
-
err = seg6_hmac_info_del(net, hmackeyid);
goto out_unlock;
@@ -130,6 +189,11 @@ static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
goto out_unlock;
}
+ if (slen > nla_len(info->attrs[SEG6_ATTR_SECRET])) {
+ err = -EINVAL;
+ goto out_unlock;
+ }
+
if (hinfo) {
err = seg6_hmac_info_del(net, hmackeyid);
if (err)
@@ -221,9 +285,7 @@ static int seg6_genl_get_tunsrc(struct sk_buff *skb, struct genl_info *info)
rcu_read_unlock();
genlmsg_end(msg, hdr);
- genlmsg_reply(msg, info);
-
- return 0;
+ return genlmsg_reply(msg, info);
nla_put_failure:
rcu_read_unlock();
@@ -373,9 +435,11 @@ static int __net_init seg6_net_init(struct net *net)
net->ipv6.seg6_data = sdata;
-#ifdef CONFIG_IPV6_SEG6_HMAC
- seg6_hmac_net_init(net);
-#endif
+ if (seg6_hmac_net_init(net)) {
+ kfree(rcu_dereference_raw(sdata->tun_src));
+ kfree(sdata);
+ return -ENOMEM;
+ }
return 0;
}
@@ -384,11 +448,9 @@ static void __net_exit seg6_net_exit(struct net *net)
{
struct seg6_pernet_data *sdata = seg6_pernet(net);
-#ifdef CONFIG_IPV6_SEG6_HMAC
seg6_hmac_net_exit(net);
-#endif
- kfree(sdata->tun_src);
+ kfree(rcu_dereference_raw(sdata->tun_src));
kfree(sdata);
}
@@ -400,28 +462,28 @@ static struct pernet_operations ip6_segments_ops = {
static const struct genl_ops seg6_genl_ops[] = {
{
.cmd = SEG6_CMD_SETHMAC,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = seg6_genl_sethmac,
- .policy = seg6_genl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = SEG6_CMD_DUMPHMAC,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.start = seg6_genl_dumphmac_start,
.dumpit = seg6_genl_dumphmac,
.done = seg6_genl_dumphmac_done,
- .policy = seg6_genl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = SEG6_CMD_SET_TUNSRC,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = seg6_genl_set_tunsrc,
- .policy = seg6_genl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = SEG6_CMD_GET_TUNSRC,
+ .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = seg6_genl_get_tunsrc,
- .policy = seg6_genl_policy,
.flags = GENL_ADMIN_PERM,
},
};
@@ -431,69 +493,52 @@ static struct genl_family seg6_genl_family __ro_after_init = {
.name = SEG6_GENL_NAME,
.version = SEG6_GENL_VERSION,
.maxattr = SEG6_ATTR_MAX,
+ .policy = seg6_genl_policy,
.netnsok = true,
.parallel_ops = true,
.ops = seg6_genl_ops,
.n_ops = ARRAY_SIZE(seg6_genl_ops),
+ .resv_start_op = SEG6_CMD_GET_TUNSRC + 1,
.module = THIS_MODULE,
};
int __init seg6_init(void)
{
- int err = -ENOMEM;
+ int err;
- err = genl_register_family(&seg6_genl_family);
+ err = register_pernet_subsys(&ip6_segments_ops);
if (err)
goto out;
- err = register_pernet_subsys(&ip6_segments_ops);
+ err = genl_register_family(&seg6_genl_family);
if (err)
- goto out_unregister_genl;
+ goto out_unregister_pernet;
-#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
err = seg6_iptunnel_init();
if (err)
- goto out_unregister_pernet;
+ goto out_unregister_genl;
err = seg6_local_init();
if (err)
- goto out_unregister_pernet;
-#endif
-
-#ifdef CONFIG_IPV6_SEG6_HMAC
- err = seg6_hmac_init();
- if (err)
goto out_unregister_iptun;
-#endif
pr_info("Segment Routing with IPv6\n");
out:
return err;
-#ifdef CONFIG_IPV6_SEG6_HMAC
out_unregister_iptun:
-#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
- seg6_local_exit();
seg6_iptunnel_exit();
-#endif
-#endif
-#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
-out_unregister_pernet:
- unregister_pernet_subsys(&ip6_segments_ops);
-#endif
out_unregister_genl:
genl_unregister_family(&seg6_genl_family);
+out_unregister_pernet:
+ unregister_pernet_subsys(&ip6_segments_ops);
goto out;
}
void seg6_exit(void)
{
-#ifdef CONFIG_IPV6_SEG6_HMAC
- seg6_hmac_exit();
-#endif
-#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
+ seg6_local_exit();
seg6_iptunnel_exit();
-#endif
- unregister_pernet_subsys(&ip6_segments_ops);
genl_unregister_family(&seg6_genl_family);
+ unregister_pernet_subsys(&ip6_segments_ops);
}
generated by cgit (git 2.34.1) at 2025-12-24 23:00:21 +0000