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-rw-r--r--net/ipv6/Kconfig3
-rw-r--r--net/ipv6/Makefile2
-rw-r--r--net/ipv6/seg6.c5
-rw-r--r--net/ipv6/seg6_local.c320
4 files changed, 328 insertions, 2 deletions
diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index 50181a96923e..0d722396dce6 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -311,7 +311,8 @@ config IPV6_SEG6_LWTUNNEL
---help---
Support for encapsulation of packets within an outer IPv6
header and a Segment Routing Header using the lightweight
- tunnels mechanism.
+ tunnels mechanism. Also enable support for advanced local
+ processing of SRv6 packets based on their active segment.
If unsure, say N.
diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile
index f8b24c2e0d77..10e342363793 100644
--- a/net/ipv6/Makefile
+++ b/net/ipv6/Makefile
@@ -23,7 +23,7 @@ ipv6-$(CONFIG_IPV6_MULTIPLE_TABLES) += fib6_rules.o
ipv6-$(CONFIG_PROC_FS) += proc.o
ipv6-$(CONFIG_SYN_COOKIES) += syncookies.o
ipv6-$(CONFIG_NETLABEL) += calipso.o
-ipv6-$(CONFIG_IPV6_SEG6_LWTUNNEL) += seg6_iptunnel.o
+ipv6-$(CONFIG_IPV6_SEG6_LWTUNNEL) += seg6_iptunnel.o seg6_local.o
ipv6-$(CONFIG_IPV6_SEG6_HMAC) += seg6_hmac.o
ipv6-objs += $(ipv6-y)
diff --git a/net/ipv6/seg6.c b/net/ipv6/seg6.c
index 81c2339b3285..c81407770956 100644
--- a/net/ipv6/seg6.c
+++ b/net/ipv6/seg6.c
@@ -456,6 +456,10 @@ int __init seg6_init(void)
err = seg6_iptunnel_init();
if (err)
goto out_unregister_pernet;
+
+ err = seg6_local_init();
+ if (err)
+ goto out_unregister_pernet;
#endif
#ifdef CONFIG_IPV6_SEG6_HMAC
@@ -471,6 +475,7 @@ out:
#ifdef CONFIG_IPV6_SEG6_HMAC
out_unregister_iptun:
#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
+ seg6_local_exit();
seg6_iptunnel_exit();
#endif
#endif
diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c
new file mode 100644
index 000000000000..53615d7e0723
--- /dev/null
+++ b/net/ipv6/seg6_local.c
@@ -0,0 +1,320 @@
+/*
+ * 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/types.h>
+#include <linux/skbuff.h>
+#include <linux/net.h>
+#include <linux/module.h>
+#include <net/ip.h>
+#include <net/lwtunnel.h>
+#include <net/netevent.h>
+#include <net/netns/generic.h>
+#include <net/ip6_fib.h>
+#include <net/route.h>
+#include <net/seg6.h>
+#include <linux/seg6.h>
+#include <linux/seg6_local.h>
+#include <net/addrconf.h>
+#include <net/ip6_route.h>
+#include <net/dst_cache.h>
+#ifdef CONFIG_IPV6_SEG6_HMAC
+#include <net/seg6_hmac.h>
+#endif
+
+struct seg6_local_lwt;
+
+struct seg6_action_desc {
+ int action;
+ unsigned long attrs;
+ int (*input)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
+ int static_headroom;
+};
+
+struct seg6_local_lwt {
+ int action;
+ struct ipv6_sr_hdr *srh;
+ int table;
+ struct in_addr nh4;
+ struct in6_addr nh6;
+ int iif;
+ int oif;
+
+ int headroom;
+ struct seg6_action_desc *desc;
+};
+
+static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt)
+{
+ return (struct seg6_local_lwt *)lwt->data;
+}
+
+static struct seg6_action_desc seg6_action_table[] = {
+ {
+ .action = SEG6_LOCAL_ACTION_END,
+ .attrs = 0,
+ },
+};
+
+static struct seg6_action_desc *__get_action_desc(int action)
+{
+ struct seg6_action_desc *desc;
+ int i, count;
+
+ count = sizeof(seg6_action_table) / sizeof(struct seg6_action_desc);
+ for (i = 0; i < count; i++) {
+ desc = &seg6_action_table[i];
+ if (desc->action == action)
+ return desc;
+ }
+
+ return NULL;
+}
+
+static int seg6_local_input(struct sk_buff *skb)
+{
+ struct dst_entry *orig_dst = skb_dst(skb);
+ struct seg6_action_desc *desc;
+ struct seg6_local_lwt *slwt;
+
+ slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
+ desc = slwt->desc;
+
+ return desc->input(skb, slwt);
+}
+
+static const struct nla_policy seg6_local_policy[SEG6_LOCAL_MAX + 1] = {
+ [SEG6_LOCAL_ACTION] = { .type = NLA_U32 },
+ [SEG6_LOCAL_SRH] = { .type = NLA_BINARY },
+ [SEG6_LOCAL_TABLE] = { .type = NLA_U32 },
+ [SEG6_LOCAL_NH4] = { .type = NLA_BINARY,
+ .len = sizeof(struct in_addr) },
+ [SEG6_LOCAL_NH6] = { .type = NLA_BINARY,
+ .len = sizeof(struct in6_addr) },
+ [SEG6_LOCAL_IIF] = { .type = NLA_U32 },
+ [SEG6_LOCAL_OIF] = { .type = NLA_U32 },
+};
+
+struct seg6_action_param {
+ int (*parse)(struct nlattr **attrs, struct seg6_local_lwt *slwt);
+ int (*put)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
+ int (*cmp)(struct seg6_local_lwt *a, struct seg6_local_lwt *b);
+};
+
+static struct seg6_action_param seg6_action_params[SEG6_LOCAL_MAX + 1] = {
+ [SEG6_LOCAL_SRH] = { .parse = NULL,
+ .put = NULL,
+ .cmp = NULL },
+
+ [SEG6_LOCAL_TABLE] = { .parse = NULL,
+ .put = NULL,
+ .cmp = NULL },
+
+ [SEG6_LOCAL_NH4] = { .parse = NULL,
+ .put = NULL,
+ .cmp = NULL },
+
+ [SEG6_LOCAL_NH6] = { .parse = NULL,
+ .put = NULL,
+ .cmp = NULL },
+
+ [SEG6_LOCAL_IIF] = { .parse = NULL,
+ .put = NULL,
+ .cmp = NULL },
+
+ [SEG6_LOCAL_OIF] = { .parse = NULL,
+ .put = NULL,
+ .cmp = NULL },
+};
+
+static int parse_nla_action(struct nlattr **attrs, struct seg6_local_lwt *slwt)
+{
+ struct seg6_action_param *param;
+ struct seg6_action_desc *desc;
+ int i, err;
+
+ desc = __get_action_desc(slwt->action);
+ if (!desc)
+ return -EINVAL;
+
+ if (!desc->input)
+ return -EOPNOTSUPP;
+
+ slwt->desc = desc;
+ slwt->headroom += desc->static_headroom;
+
+ for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
+ if (desc->attrs & (1 << i)) {
+ if (!attrs[i])
+ return -EINVAL;
+
+ param = &seg6_action_params[i];
+
+ err = param->parse(attrs, slwt);
+ if (err < 0)
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int seg6_local_build_state(struct nlattr *nla, unsigned int family,
+ const void *cfg, struct lwtunnel_state **ts,
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *tb[SEG6_LOCAL_MAX + 1];
+ struct lwtunnel_state *newts;
+ struct seg6_local_lwt *slwt;
+ int err;
+
+ err = nla_parse_nested(tb, SEG6_LOCAL_MAX, nla, seg6_local_policy,
+ extack);
+
+ if (err < 0)
+ return err;
+
+ if (!tb[SEG6_LOCAL_ACTION])
+ return -EINVAL;
+
+ newts = lwtunnel_state_alloc(sizeof(*slwt));
+ if (!newts)
+ return -ENOMEM;
+
+ slwt = seg6_local_lwtunnel(newts);
+ slwt->action = nla_get_u32(tb[SEG6_LOCAL_ACTION]);
+
+ err = parse_nla_action(tb, slwt);
+ if (err < 0)
+ goto out_free;
+
+ newts->type = LWTUNNEL_ENCAP_SEG6_LOCAL;
+ newts->flags = LWTUNNEL_STATE_INPUT_REDIRECT;
+ newts->headroom = slwt->headroom;
+
+ *ts = newts;
+
+ return 0;
+
+out_free:
+ kfree(slwt->srh);
+ kfree(newts);
+ return err;
+}
+
+static void seg6_local_destroy_state(struct lwtunnel_state *lwt)
+{
+ struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
+
+ kfree(slwt->srh);
+}
+
+static int seg6_local_fill_encap(struct sk_buff *skb,
+ struct lwtunnel_state *lwt)
+{
+ struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
+ struct seg6_action_param *param;
+ int i, err;
+
+ if (nla_put_u32(skb, SEG6_LOCAL_ACTION, slwt->action))
+ return -EMSGSIZE;
+
+ for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
+ if (slwt->desc->attrs & (1 << i)) {
+ param = &seg6_action_params[i];
+ err = param->put(skb, slwt);
+ if (err < 0)
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int seg6_local_get_encap_size(struct lwtunnel_state *lwt)
+{
+ struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
+ unsigned long attrs;
+ int nlsize;
+
+ nlsize = nla_total_size(4); /* action */
+
+ attrs = slwt->desc->attrs;
+
+ if (attrs & (1 << SEG6_LOCAL_SRH))
+ nlsize += nla_total_size((slwt->srh->hdrlen + 1) << 3);
+
+ if (attrs & (1 << SEG6_LOCAL_TABLE))
+ nlsize += nla_total_size(4);
+
+ if (attrs & (1 << SEG6_LOCAL_NH4))
+ nlsize += nla_total_size(4);
+
+ if (attrs & (1 << SEG6_LOCAL_NH6))
+ nlsize += nla_total_size(16);
+
+ if (attrs & (1 << SEG6_LOCAL_IIF))
+ nlsize += nla_total_size(4);
+
+ if (attrs & (1 << SEG6_LOCAL_OIF))
+ nlsize += nla_total_size(4);
+
+ return nlsize;
+}
+
+static int seg6_local_cmp_encap(struct lwtunnel_state *a,
+ struct lwtunnel_state *b)
+{
+ struct seg6_local_lwt *slwt_a, *slwt_b;
+ struct seg6_action_param *param;
+ int i;
+
+ slwt_a = seg6_local_lwtunnel(a);
+ slwt_b = seg6_local_lwtunnel(b);
+
+ if (slwt_a->action != slwt_b->action)
+ return 1;
+
+ if (slwt_a->desc->attrs != slwt_b->desc->attrs)
+ return 1;
+
+ for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
+ if (slwt_a->desc->attrs & (1 << i)) {
+ param = &seg6_action_params[i];
+ if (param->cmp(slwt_a, slwt_b))
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static const struct lwtunnel_encap_ops seg6_local_ops = {
+ .build_state = seg6_local_build_state,
+ .destroy_state = seg6_local_destroy_state,
+ .input = seg6_local_input,
+ .fill_encap = seg6_local_fill_encap,
+ .get_encap_size = seg6_local_get_encap_size,
+ .cmp_encap = seg6_local_cmp_encap,
+ .owner = THIS_MODULE,
+};
+
+int __init seg6_local_init(void)
+{
+ return lwtunnel_encap_add_ops(&seg6_local_ops,
+ LWTUNNEL_ENCAP_SEG6_LOCAL);
+}
+
+void seg6_local_exit(void)
+{
+ lwtunnel_encap_del_ops(&seg6_local_ops, LWTUNNEL_ENCAP_SEG6_LOCAL);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 05:21:49 +0000