cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bpf_iter_udp6.c (2149B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (c) 2020 Facebook */
      3#include "bpf_iter.h"
      4#include "bpf_tracing_net.h"
      5#include <bpf/bpf_helpers.h>
      6#include <bpf/bpf_endian.h>
      7
      8char _license[] SEC("license") = "GPL";
      9
     10#define IPV6_SEQ_DGRAM_HEADER				\
     11	"  sl  "					\
     12	"local_address                         "	\
     13	"remote_address                        "	\
     14	"st tx_queue rx_queue tr tm->when retrnsmt"	\
     15	"   uid  timeout inode ref pointer drops\n"
     16
     17static long sock_i_ino(const struct sock *sk)
     18{
     19	const struct socket *sk_socket = sk->sk_socket;
     20	const struct inode *inode;
     21	unsigned long ino;
     22
     23	if (!sk_socket)
     24		return 0;
     25
     26	inode = &container_of(sk_socket, struct socket_alloc, socket)->vfs_inode;
     27	bpf_probe_read_kernel(&ino, sizeof(ino), &inode->i_ino);
     28	return ino;
     29}
     30
     31SEC("iter/udp")
     32int dump_udp6(struct bpf_iter__udp *ctx)
     33{
     34	struct seq_file *seq = ctx->meta->seq;
     35	struct udp_sock *udp_sk = ctx->udp_sk;
     36	const struct in6_addr *dest, *src;
     37	struct udp6_sock *udp6_sk;
     38	struct inet_sock *inet;
     39	__u16 srcp, destp;
     40	__u32 seq_num;
     41	int rqueue;
     42
     43	if (udp_sk == (void *)0)
     44		return 0;
     45
     46	seq_num = ctx->meta->seq_num;
     47	if (seq_num == 0)
     48		BPF_SEQ_PRINTF(seq, IPV6_SEQ_DGRAM_HEADER);
     49
     50	udp6_sk = bpf_skc_to_udp6_sock(udp_sk);
     51	if (udp6_sk == (void *)0)
     52		return 0;
     53
     54	inet = &udp_sk->inet;
     55	srcp = bpf_ntohs(inet->inet_sport);
     56	destp = bpf_ntohs(inet->inet_dport);
     57	rqueue = inet->sk.sk_rmem_alloc.counter - udp_sk->forward_deficit;
     58	dest  = &inet->sk.sk_v6_daddr;
     59	src   = &inet->sk.sk_v6_rcv_saddr;
     60
     61	BPF_SEQ_PRINTF(seq, "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X ",
     62		       ctx->bucket,
     63		       src->s6_addr32[0], src->s6_addr32[1],
     64		       src->s6_addr32[2], src->s6_addr32[3], srcp,
     65		       dest->s6_addr32[0], dest->s6_addr32[1],
     66		       dest->s6_addr32[2], dest->s6_addr32[3], destp);
     67
     68	BPF_SEQ_PRINTF(seq, "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
     69		       inet->sk.sk_state,
     70		       inet->sk.sk_wmem_alloc.refs.counter - 1,
     71		       rqueue,
     72		       0, 0L, 0, ctx->uid, 0,
     73		       sock_i_ino(&inet->sk),
     74		       inet->sk.sk_refcnt.refs.counter, udp_sk,
     75		       inet->sk.sk_drops.counter);
     76
     77	return 0;
     78}