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