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https://github.com/edk2-porting/linux-next.git
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33f11d1614
Create ila directory in preparation for supporting other hooks in the kernel than LWT for doing ILA. This includes: - Moving ila.c to ila/ila_lwt.c - Splitting out some common functions into ila_common.c Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
153 lines
3.3 KiB
C
153 lines
3.3 KiB
C
#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/ip.h>
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#include <net/ip6_fib.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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static inline struct ila_params *ila_params_lwtunnel(
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struct lwtunnel_state *lwstate)
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{
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return (struct ila_params *)lwstate->data;
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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 *dst = skb_dst(skb);
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if (skb->protocol != htons(ETH_P_IPV6))
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goto drop;
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update_ipv6_locator(skb, ila_params_lwtunnel(dst->lwtstate));
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return dst->lwtstate->orig_output(net, sk, 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 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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if (skb->protocol != htons(ETH_P_IPV6))
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goto drop;
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update_ipv6_locator(skb, ila_params_lwtunnel(dst->lwtstate));
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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 struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = {
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[ILA_ATTR_LOCATOR] = { .type = NLA_U64, },
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};
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static int ila_build_state(struct net_device *dev, 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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{
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struct ila_params *p;
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struct nlattr *tb[ILA_ATTR_MAX + 1];
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size_t encap_len = sizeof(*p);
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struct lwtunnel_state *newts;
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const struct fib6_config *cfg6 = cfg;
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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(tb, ILA_ATTR_MAX, nla,
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ila_nl_policy);
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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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newts = lwtunnel_state_alloc(encap_len);
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if (!newts)
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return -ENOMEM;
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newts->len = encap_len;
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p = ila_params_lwtunnel(newts);
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p->locator = (__force __be64)nla_get_u64(tb[ILA_ATTR_LOCATOR]);
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if (cfg6->fc_dst_len > sizeof(__be64)) {
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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 = *(__be64 *)&cfg6->fc_dst;
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p->csum_diff = compute_csum_diff8(
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(__be32 *)&p->locator_match, (__be32 *)&p->locator);
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}
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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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*ts = newts;
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return 0;
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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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if (nla_put_u64(skb, ILA_ATTR_LOCATOR, (__force u64)p->locator))
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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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/* No encapsulation overhead */
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return 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 != b_p->locator);
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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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.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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};
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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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