mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 21:24:00 +08:00
cdb749cef1
Fix build errors for samples/bpf xdp_tx_iptunnel and tc_l2_redirect, when dynamic debugging is enabled (CONFIG_DYNAMIC_DEBUG) by defining a fake KBUILD_MODNAME. Just like Daniel Borkmann fixed other samples/bpf in commit96a8eb1eee
("bpf: fix samples to add fake KBUILD_MODNAME"). Fixes:12d8bb64e3
("bpf: xdp: Add XDP example for head adjustment") Fixes:90e02896f1
("bpf: Add test for bpf_redirect to ipip/ip6tnl") Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
238 lines
5.6 KiB
C
238 lines
5.6 KiB
C
/* Copyright (c) 2016 Facebook
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*
|
|
* This program shows how to use bpf_xdp_adjust_head() by
|
|
* encapsulating the incoming packet in an IPv4/v6 header
|
|
* and then XDP_TX it out.
|
|
*/
|
|
#define KBUILD_MODNAME "foo"
|
|
#include <uapi/linux/bpf.h>
|
|
#include <linux/in.h>
|
|
#include <linux/if_ether.h>
|
|
#include <linux/if_packet.h>
|
|
#include <linux/if_vlan.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/ipv6.h>
|
|
#include "bpf_helpers.h"
|
|
#include "xdp_tx_iptunnel_common.h"
|
|
|
|
struct bpf_map_def SEC("maps") rxcnt = {
|
|
.type = BPF_MAP_TYPE_PERCPU_ARRAY,
|
|
.key_size = sizeof(__u32),
|
|
.value_size = sizeof(__u64),
|
|
.max_entries = 256,
|
|
};
|
|
|
|
struct bpf_map_def SEC("maps") vip2tnl = {
|
|
.type = BPF_MAP_TYPE_HASH,
|
|
.key_size = sizeof(struct vip),
|
|
.value_size = sizeof(struct iptnl_info),
|
|
.max_entries = MAX_IPTNL_ENTRIES,
|
|
};
|
|
|
|
static __always_inline void count_tx(u32 protocol)
|
|
{
|
|
u64 *rxcnt_count;
|
|
|
|
rxcnt_count = bpf_map_lookup_elem(&rxcnt, &protocol);
|
|
if (rxcnt_count)
|
|
*rxcnt_count += 1;
|
|
}
|
|
|
|
static __always_inline int get_dport(void *trans_data, void *data_end,
|
|
u8 protocol)
|
|
{
|
|
struct tcphdr *th;
|
|
struct udphdr *uh;
|
|
|
|
switch (protocol) {
|
|
case IPPROTO_TCP:
|
|
th = (struct tcphdr *)trans_data;
|
|
if (th + 1 > data_end)
|
|
return -1;
|
|
return th->dest;
|
|
case IPPROTO_UDP:
|
|
uh = (struct udphdr *)trans_data;
|
|
if (uh + 1 > data_end)
|
|
return -1;
|
|
return uh->dest;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static __always_inline void set_ethhdr(struct ethhdr *new_eth,
|
|
const struct ethhdr *old_eth,
|
|
const struct iptnl_info *tnl,
|
|
__be16 h_proto)
|
|
{
|
|
memcpy(new_eth->h_source, old_eth->h_dest, sizeof(new_eth->h_source));
|
|
memcpy(new_eth->h_dest, tnl->dmac, sizeof(new_eth->h_dest));
|
|
new_eth->h_proto = h_proto;
|
|
}
|
|
|
|
static __always_inline int handle_ipv4(struct xdp_md *xdp)
|
|
{
|
|
void *data_end = (void *)(long)xdp->data_end;
|
|
void *data = (void *)(long)xdp->data;
|
|
struct iptnl_info *tnl;
|
|
struct ethhdr *new_eth;
|
|
struct ethhdr *old_eth;
|
|
struct iphdr *iph = data + sizeof(struct ethhdr);
|
|
u16 *next_iph_u16;
|
|
u16 payload_len;
|
|
struct vip vip = {};
|
|
int dport;
|
|
u32 csum = 0;
|
|
int i;
|
|
|
|
if (iph + 1 > data_end)
|
|
return XDP_DROP;
|
|
|
|
dport = get_dport(iph + 1, data_end, iph->protocol);
|
|
if (dport == -1)
|
|
return XDP_DROP;
|
|
|
|
vip.protocol = iph->protocol;
|
|
vip.family = AF_INET;
|
|
vip.daddr.v4 = iph->daddr;
|
|
vip.dport = dport;
|
|
payload_len = ntohs(iph->tot_len);
|
|
|
|
tnl = bpf_map_lookup_elem(&vip2tnl, &vip);
|
|
/* It only does v4-in-v4 */
|
|
if (!tnl || tnl->family != AF_INET)
|
|
return XDP_PASS;
|
|
|
|
/* The vip key is found. Add an IP header and send it out */
|
|
|
|
if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct iphdr)))
|
|
return XDP_DROP;
|
|
|
|
data = (void *)(long)xdp->data;
|
|
data_end = (void *)(long)xdp->data_end;
|
|
|
|
new_eth = data;
|
|
iph = data + sizeof(*new_eth);
|
|
old_eth = data + sizeof(*iph);
|
|
|
|
if (new_eth + 1 > data_end ||
|
|
old_eth + 1 > data_end ||
|
|
iph + 1 > data_end)
|
|
return XDP_DROP;
|
|
|
|
set_ethhdr(new_eth, old_eth, tnl, htons(ETH_P_IP));
|
|
|
|
iph->version = 4;
|
|
iph->ihl = sizeof(*iph) >> 2;
|
|
iph->frag_off = 0;
|
|
iph->protocol = IPPROTO_IPIP;
|
|
iph->check = 0;
|
|
iph->tos = 0;
|
|
iph->tot_len = htons(payload_len + sizeof(*iph));
|
|
iph->daddr = tnl->daddr.v4;
|
|
iph->saddr = tnl->saddr.v4;
|
|
iph->ttl = 8;
|
|
|
|
next_iph_u16 = (u16 *)iph;
|
|
#pragma clang loop unroll(full)
|
|
for (i = 0; i < sizeof(*iph) >> 1; i++)
|
|
csum += *next_iph_u16++;
|
|
|
|
iph->check = ~((csum & 0xffff) + (csum >> 16));
|
|
|
|
count_tx(vip.protocol);
|
|
|
|
return XDP_TX;
|
|
}
|
|
|
|
static __always_inline int handle_ipv6(struct xdp_md *xdp)
|
|
{
|
|
void *data_end = (void *)(long)xdp->data_end;
|
|
void *data = (void *)(long)xdp->data;
|
|
struct iptnl_info *tnl;
|
|
struct ethhdr *new_eth;
|
|
struct ethhdr *old_eth;
|
|
struct ipv6hdr *ip6h = data + sizeof(struct ethhdr);
|
|
__u16 payload_len;
|
|
struct vip vip = {};
|
|
int dport;
|
|
|
|
if (ip6h + 1 > data_end)
|
|
return XDP_DROP;
|
|
|
|
dport = get_dport(ip6h + 1, data_end, ip6h->nexthdr);
|
|
if (dport == -1)
|
|
return XDP_DROP;
|
|
|
|
vip.protocol = ip6h->nexthdr;
|
|
vip.family = AF_INET6;
|
|
memcpy(vip.daddr.v6, ip6h->daddr.s6_addr32, sizeof(vip.daddr));
|
|
vip.dport = dport;
|
|
payload_len = ip6h->payload_len;
|
|
|
|
tnl = bpf_map_lookup_elem(&vip2tnl, &vip);
|
|
/* It only does v6-in-v6 */
|
|
if (!tnl || tnl->family != AF_INET6)
|
|
return XDP_PASS;
|
|
|
|
/* The vip key is found. Add an IP header and send it out */
|
|
|
|
if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct ipv6hdr)))
|
|
return XDP_DROP;
|
|
|
|
data = (void *)(long)xdp->data;
|
|
data_end = (void *)(long)xdp->data_end;
|
|
|
|
new_eth = data;
|
|
ip6h = data + sizeof(*new_eth);
|
|
old_eth = data + sizeof(*ip6h);
|
|
|
|
if (new_eth + 1 > data_end ||
|
|
old_eth + 1 > data_end ||
|
|
ip6h + 1 > data_end)
|
|
return XDP_DROP;
|
|
|
|
set_ethhdr(new_eth, old_eth, tnl, htons(ETH_P_IPV6));
|
|
|
|
ip6h->version = 6;
|
|
ip6h->priority = 0;
|
|
memset(ip6h->flow_lbl, 0, sizeof(ip6h->flow_lbl));
|
|
ip6h->payload_len = htons(ntohs(payload_len) + sizeof(*ip6h));
|
|
ip6h->nexthdr = IPPROTO_IPV6;
|
|
ip6h->hop_limit = 8;
|
|
memcpy(ip6h->saddr.s6_addr32, tnl->saddr.v6, sizeof(tnl->saddr.v6));
|
|
memcpy(ip6h->daddr.s6_addr32, tnl->daddr.v6, sizeof(tnl->daddr.v6));
|
|
|
|
count_tx(vip.protocol);
|
|
|
|
return XDP_TX;
|
|
}
|
|
|
|
SEC("xdp_tx_iptunnel")
|
|
int _xdp_tx_iptunnel(struct xdp_md *xdp)
|
|
{
|
|
void *data_end = (void *)(long)xdp->data_end;
|
|
void *data = (void *)(long)xdp->data;
|
|
struct ethhdr *eth = data;
|
|
__u16 h_proto;
|
|
|
|
if (eth + 1 > data_end)
|
|
return XDP_DROP;
|
|
|
|
h_proto = eth->h_proto;
|
|
|
|
if (h_proto == htons(ETH_P_IP))
|
|
return handle_ipv4(xdp);
|
|
else if (h_proto == htons(ETH_P_IPV6))
|
|
|
|
return handle_ipv6(xdp);
|
|
else
|
|
return XDP_PASS;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|