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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /net/ipv6/ila/ila_lwt.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/ipv6/ila/ila_lwt.c')
-rw-r--r--net/ipv6/ila/ila_lwt.c325
1 files changed, 325 insertions, 0 deletions
diff --git a/net/ipv6/ila/ila_lwt.c b/net/ipv6/ila/ila_lwt.c
new file mode 100644
index 000000000..8c1ce7895
--- /dev/null
+++ b/net/ipv6/ila/ila_lwt.c
@@ -0,0 +1,325 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/errno.h>
+#include <linux/ip.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/socket.h>
+#include <linux/types.h>
+#include <net/checksum.h>
+#include <net/dst_cache.h>
+#include <net/ip.h>
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+#include <net/lwtunnel.h>
+#include <net/protocol.h>
+#include <uapi/linux/ila.h>
+#include "ila.h"
+
+struct ila_lwt {
+ struct ila_params p;
+ struct dst_cache dst_cache;
+ u32 connected : 1;
+ u32 lwt_output : 1;
+};
+
+static inline struct ila_lwt *ila_lwt_lwtunnel(
+ struct lwtunnel_state *lwt)
+{
+ return (struct ila_lwt *)lwt->data;
+}
+
+static inline struct ila_params *ila_params_lwtunnel(
+ struct lwtunnel_state *lwt)
+{
+ return &ila_lwt_lwtunnel(lwt)->p;
+}
+
+static int ila_output(struct net *net, struct sock *sk, struct sk_buff *skb)
+{
+ struct dst_entry *orig_dst = skb_dst(skb);
+ struct rt6_info *rt = (struct rt6_info *)orig_dst;
+ struct ila_lwt *ilwt = ila_lwt_lwtunnel(orig_dst->lwtstate);
+ struct dst_entry *dst;
+ int err = -EINVAL;
+
+ if (skb->protocol != htons(ETH_P_IPV6))
+ goto drop;
+
+ if (ilwt->lwt_output)
+ ila_update_ipv6_locator(skb,
+ ila_params_lwtunnel(orig_dst->lwtstate),
+ true);
+
+ if (rt->rt6i_flags & (RTF_GATEWAY | RTF_CACHE)) {
+ /* Already have a next hop address in route, no need for
+ * dest cache route.
+ */
+ return orig_dst->lwtstate->orig_output(net, sk, skb);
+ }
+
+ dst = dst_cache_get(&ilwt->dst_cache);
+ if (unlikely(!dst)) {
+ struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ struct flowi6 fl6;
+
+ /* Lookup a route for the new destination. Take into
+ * account that the base route may already have a gateway.
+ */
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_oif = orig_dst->dev->ifindex;
+ fl6.flowi6_iif = LOOPBACK_IFINDEX;
+ fl6.daddr = *rt6_nexthop((struct rt6_info *)orig_dst,
+ &ip6h->daddr);
+
+ dst = ip6_route_output(net, NULL, &fl6);
+ if (dst->error) {
+ err = -EHOSTUNREACH;
+ dst_release(dst);
+ goto drop;
+ }
+
+ dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
+ if (IS_ERR(dst)) {
+ err = PTR_ERR(dst);
+ goto drop;
+ }
+
+ if (ilwt->connected)
+ dst_cache_set_ip6(&ilwt->dst_cache, dst, &fl6.saddr);
+ }
+
+ skb_dst_set(skb, dst);
+ return dst_output(net, sk, skb);
+
+drop:
+ kfree_skb(skb);
+ return err;
+}
+
+static int ila_input(struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb_dst(skb);
+ struct ila_lwt *ilwt = ila_lwt_lwtunnel(dst->lwtstate);
+
+ if (skb->protocol != htons(ETH_P_IPV6))
+ goto drop;
+
+ if (!ilwt->lwt_output)
+ ila_update_ipv6_locator(skb,
+ ila_params_lwtunnel(dst->lwtstate),
+ false);
+
+ return dst->lwtstate->orig_input(skb);
+
+drop:
+ kfree_skb(skb);
+ return -EINVAL;
+}
+
+static const struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = {
+ [ILA_ATTR_LOCATOR] = { .type = NLA_U64, },
+ [ILA_ATTR_CSUM_MODE] = { .type = NLA_U8, },
+ [ILA_ATTR_IDENT_TYPE] = { .type = NLA_U8, },
+ [ILA_ATTR_HOOK_TYPE] = { .type = NLA_U8, },
+};
+
+static int ila_build_state(struct net *net, struct nlattr *nla,
+ unsigned int family, const void *cfg,
+ struct lwtunnel_state **ts,
+ struct netlink_ext_ack *extack)
+{
+ struct ila_lwt *ilwt;
+ struct ila_params *p;
+ struct nlattr *tb[ILA_ATTR_MAX + 1];
+ struct lwtunnel_state *newts;
+ const struct fib6_config *cfg6 = cfg;
+ struct ila_addr *iaddr;
+ u8 ident_type = ILA_ATYPE_USE_FORMAT;
+ u8 hook_type = ILA_HOOK_ROUTE_OUTPUT;
+ u8 csum_mode = ILA_CSUM_NO_ACTION;
+ bool lwt_output = true;
+ u8 eff_ident_type;
+ int ret;
+
+ if (family != AF_INET6)
+ return -EINVAL;
+
+ ret = nla_parse_nested_deprecated(tb, ILA_ATTR_MAX, nla,
+ ila_nl_policy, extack);
+ if (ret < 0)
+ return ret;
+
+ if (!tb[ILA_ATTR_LOCATOR])
+ return -EINVAL;
+
+ iaddr = (struct ila_addr *)&cfg6->fc_dst;
+
+ if (tb[ILA_ATTR_IDENT_TYPE])
+ ident_type = nla_get_u8(tb[ILA_ATTR_IDENT_TYPE]);
+
+ if (ident_type == ILA_ATYPE_USE_FORMAT) {
+ /* Infer identifier type from type field in formatted
+ * identifier.
+ */
+
+ if (cfg6->fc_dst_len < 8 * sizeof(struct ila_locator) + 3) {
+ /* Need to have full locator and at least type field
+ * included in destination
+ */
+ return -EINVAL;
+ }
+
+ eff_ident_type = iaddr->ident.type;
+ } else {
+ eff_ident_type = ident_type;
+ }
+
+ switch (eff_ident_type) {
+ case ILA_ATYPE_IID:
+ /* Don't allow ILA for IID type */
+ return -EINVAL;
+ case ILA_ATYPE_LUID:
+ break;
+ case ILA_ATYPE_VIRT_V4:
+ case ILA_ATYPE_VIRT_UNI_V6:
+ case ILA_ATYPE_VIRT_MULTI_V6:
+ case ILA_ATYPE_NONLOCAL_ADDR:
+ /* These ILA formats are not supported yet. */
+ default:
+ return -EINVAL;
+ }
+
+ if (tb[ILA_ATTR_HOOK_TYPE])
+ hook_type = nla_get_u8(tb[ILA_ATTR_HOOK_TYPE]);
+
+ switch (hook_type) {
+ case ILA_HOOK_ROUTE_OUTPUT:
+ lwt_output = true;
+ break;
+ case ILA_HOOK_ROUTE_INPUT:
+ lwt_output = false;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (tb[ILA_ATTR_CSUM_MODE])
+ csum_mode = nla_get_u8(tb[ILA_ATTR_CSUM_MODE]);
+
+ if (csum_mode == ILA_CSUM_NEUTRAL_MAP &&
+ ila_csum_neutral_set(iaddr->ident)) {
+ /* Don't allow translation if checksum neutral bit is
+ * configured and it's set in the SIR address.
+ */
+ return -EINVAL;
+ }
+
+ newts = lwtunnel_state_alloc(sizeof(*ilwt));
+ if (!newts)
+ return -ENOMEM;
+
+ ilwt = ila_lwt_lwtunnel(newts);
+ ret = dst_cache_init(&ilwt->dst_cache, GFP_ATOMIC);
+ if (ret) {
+ kfree(newts);
+ return ret;
+ }
+
+ ilwt->lwt_output = !!lwt_output;
+
+ p = ila_params_lwtunnel(newts);
+
+ p->csum_mode = csum_mode;
+ p->ident_type = ident_type;
+ p->locator.v64 = (__force __be64)nla_get_u64(tb[ILA_ATTR_LOCATOR]);
+
+ /* Precompute checksum difference for translation since we
+ * know both the old locator and the new one.
+ */
+ p->locator_match = iaddr->loc;
+
+ ila_init_saved_csum(p);
+
+ newts->type = LWTUNNEL_ENCAP_ILA;
+ newts->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT |
+ LWTUNNEL_STATE_INPUT_REDIRECT;
+
+ if (cfg6->fc_dst_len == 8 * sizeof(struct in6_addr))
+ ilwt->connected = 1;
+
+ *ts = newts;
+
+ return 0;
+}
+
+static void ila_destroy_state(struct lwtunnel_state *lwt)
+{
+ dst_cache_destroy(&ila_lwt_lwtunnel(lwt)->dst_cache);
+}
+
+static int ila_fill_encap_info(struct sk_buff *skb,
+ struct lwtunnel_state *lwtstate)
+{
+ struct ila_params *p = ila_params_lwtunnel(lwtstate);
+ struct ila_lwt *ilwt = ila_lwt_lwtunnel(lwtstate);
+
+ if (nla_put_u64_64bit(skb, ILA_ATTR_LOCATOR, (__force u64)p->locator.v64,
+ ILA_ATTR_PAD))
+ goto nla_put_failure;
+
+ if (nla_put_u8(skb, ILA_ATTR_CSUM_MODE, (__force u8)p->csum_mode))
+ goto nla_put_failure;
+
+ if (nla_put_u8(skb, ILA_ATTR_IDENT_TYPE, (__force u8)p->ident_type))
+ goto nla_put_failure;
+
+ if (nla_put_u8(skb, ILA_ATTR_HOOK_TYPE,
+ ilwt->lwt_output ? ILA_HOOK_ROUTE_OUTPUT :
+ ILA_HOOK_ROUTE_INPUT))
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static int ila_encap_nlsize(struct lwtunnel_state *lwtstate)
+{
+ return nla_total_size_64bit(sizeof(u64)) + /* ILA_ATTR_LOCATOR */
+ nla_total_size(sizeof(u8)) + /* ILA_ATTR_CSUM_MODE */
+ nla_total_size(sizeof(u8)) + /* ILA_ATTR_IDENT_TYPE */
+ nla_total_size(sizeof(u8)) + /* ILA_ATTR_HOOK_TYPE */
+ 0;
+}
+
+static int ila_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
+{
+ struct ila_params *a_p = ila_params_lwtunnel(a);
+ struct ila_params *b_p = ila_params_lwtunnel(b);
+
+ return (a_p->locator.v64 != b_p->locator.v64);
+}
+
+static const struct lwtunnel_encap_ops ila_encap_ops = {
+ .build_state = ila_build_state,
+ .destroy_state = ila_destroy_state,
+ .output = ila_output,
+ .input = ila_input,
+ .fill_encap = ila_fill_encap_info,
+ .get_encap_size = ila_encap_nlsize,
+ .cmp_encap = ila_encap_cmp,
+ .owner = THIS_MODULE,
+};
+
+int ila_lwt_init(void)
+{
+ return lwtunnel_encap_add_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
+}
+
+void ila_lwt_fini(void)
+{
+ lwtunnel_encap_del_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
+}