linux-imx

/*

 *  SR-IPv6 implementation

 *

 *  Authors:

 *  David Lebrun <david.lebrun@uclouvain.be>

 *  eBPF support: Mathieu Xhonneux <m.xhonneux@gmail.com>

 *

 *

 *  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

#include <net/seg6_local.h>

#include <linux/etherdevice.h>

#include <linux/bpf.h>

​

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 bpf_lwt_prog {

    struct bpf_prog *prog;

    char *name;

};

​

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;

    struct bpf_lwt_prog bpf;

​

    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 ipv6_sr_hdr *get_srh(struct sk_buff *skb)

{

    struct ipv6_sr_hdr *srh;

    int len, srhoff = 0;

​

    if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 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;

​

    if (!seg6_validate_srh(srh, len))

        return NULL;

​

    return srh;