~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/tools/testing/selftests/bpf/connect6_prog.c

Version: ~ [ linux-5.16 ] ~ [ linux-5.15.13 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.90 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.170 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.224 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.261 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.296 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.298 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 // Copyright (c) 2018 Facebook
  3 
  4 #include <string.h>
  5 
  6 #include <linux/stddef.h>
  7 #include <linux/bpf.h>
  8 #include <linux/in.h>
  9 #include <linux/in6.h>
 10 #include <sys/socket.h>
 11 
 12 #include "bpf_helpers.h"
 13 #include "bpf_endian.h"
 14 
 15 #define SRC_REWRITE_IP6_0       0
 16 #define SRC_REWRITE_IP6_1       0
 17 #define SRC_REWRITE_IP6_2       0
 18 #define SRC_REWRITE_IP6_3       6
 19 
 20 #define DST_REWRITE_IP6_0       0
 21 #define DST_REWRITE_IP6_1       0
 22 #define DST_REWRITE_IP6_2       0
 23 #define DST_REWRITE_IP6_3       1
 24 
 25 #define DST_REWRITE_PORT6       6666
 26 
 27 int _version SEC("version") = 1;
 28 
 29 SEC("cgroup/connect6")
 30 int connect_v6_prog(struct bpf_sock_addr *ctx)
 31 {
 32         struct bpf_sock_tuple tuple = {};
 33         struct sockaddr_in6 sa;
 34         struct bpf_sock *sk;
 35 
 36         /* Verify that new destination is available. */
 37         memset(&tuple.ipv6.saddr, 0, sizeof(tuple.ipv6.saddr));
 38         memset(&tuple.ipv6.sport, 0, sizeof(tuple.ipv6.sport));
 39 
 40         tuple.ipv6.daddr[0] = bpf_htonl(DST_REWRITE_IP6_0);
 41         tuple.ipv6.daddr[1] = bpf_htonl(DST_REWRITE_IP6_1);
 42         tuple.ipv6.daddr[2] = bpf_htonl(DST_REWRITE_IP6_2);
 43         tuple.ipv6.daddr[3] = bpf_htonl(DST_REWRITE_IP6_3);
 44 
 45         tuple.ipv6.dport = bpf_htons(DST_REWRITE_PORT6);
 46 
 47         if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
 48                 return 0;
 49         else if (ctx->type == SOCK_STREAM)
 50                 sk = bpf_sk_lookup_tcp(ctx, &tuple, sizeof(tuple.ipv6),
 51                                        BPF_F_CURRENT_NETNS, 0);
 52         else
 53                 sk = bpf_sk_lookup_udp(ctx, &tuple, sizeof(tuple.ipv6),
 54                                        BPF_F_CURRENT_NETNS, 0);
 55 
 56         if (!sk)
 57                 return 0;
 58 
 59         if (sk->src_ip6[0] != tuple.ipv6.daddr[0] ||
 60             sk->src_ip6[1] != tuple.ipv6.daddr[1] ||
 61             sk->src_ip6[2] != tuple.ipv6.daddr[2] ||
 62             sk->src_ip6[3] != tuple.ipv6.daddr[3] ||
 63             sk->src_port != DST_REWRITE_PORT6) {
 64                 bpf_sk_release(sk);
 65                 return 0;
 66         }
 67 
 68         bpf_sk_release(sk);
 69 
 70         /* Rewrite destination. */
 71         ctx->user_ip6[0] = bpf_htonl(DST_REWRITE_IP6_0);
 72         ctx->user_ip6[1] = bpf_htonl(DST_REWRITE_IP6_1);
 73         ctx->user_ip6[2] = bpf_htonl(DST_REWRITE_IP6_2);
 74         ctx->user_ip6[3] = bpf_htonl(DST_REWRITE_IP6_3);
 75 
 76         ctx->user_port = bpf_htons(DST_REWRITE_PORT6);
 77 
 78         /* Rewrite source. */
 79         memset(&sa, 0, sizeof(sa));
 80 
 81         sa.sin6_family = AF_INET6;
 82         sa.sin6_port = bpf_htons(0);
 83 
 84         sa.sin6_addr.s6_addr32[0] = bpf_htonl(SRC_REWRITE_IP6_0);
 85         sa.sin6_addr.s6_addr32[1] = bpf_htonl(SRC_REWRITE_IP6_1);
 86         sa.sin6_addr.s6_addr32[2] = bpf_htonl(SRC_REWRITE_IP6_2);
 87         sa.sin6_addr.s6_addr32[3] = bpf_htonl(SRC_REWRITE_IP6_3);
 88 
 89         if (bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa)) != 0)
 90                 return 0;
 91 
 92         return 1;
 93 }
 94 
 95 char _license[] SEC("license") = "GPL";
 96 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp