// SPDX-License-Identifier: GPL-2.0-only
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/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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*/
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <linux/ip.h>
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#include <net/icmp.h>
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#include <net/udp.h>
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#include <net/tcp.h>
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#include <net/route.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_bridge.h>
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#include <linux/netfilter/xt_LOG.h>
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#include <net/netfilter/nf_log.h>
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int nf_log_dump_udp_header(struct nf_log_buf *m, const struct sk_buff *skb,
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u8 proto, int fragment, unsigned int offset)
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{
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struct udphdr _udph;
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const struct udphdr *uh;
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if (proto == IPPROTO_UDP)
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/* Max length: 10 "PROTO=UDP " */
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nf_log_buf_add(m, "PROTO=UDP ");
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else /* Max length: 14 "PROTO=UDPLITE " */
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nf_log_buf_add(m, "PROTO=UDPLITE ");
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if (fragment)
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goto out;
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/* Max length: 25 "INCOMPLETE [65535 bytes] " */
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uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
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if (uh == NULL) {
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nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
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return 1;
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}
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/* Max length: 20 "SPT=65535 DPT=65535 " */
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nf_log_buf_add(m, "SPT=%u DPT=%u LEN=%u ",
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ntohs(uh->source), ntohs(uh->dest), ntohs(uh->len));
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out:
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return 0;
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}
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EXPORT_SYMBOL_GPL(nf_log_dump_udp_header);
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int nf_log_dump_tcp_header(struct nf_log_buf *m, const struct sk_buff *skb,
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u8 proto, int fragment, unsigned int offset,
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unsigned int logflags)
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{
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struct tcphdr _tcph;
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const struct tcphdr *th;
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/* Max length: 10 "PROTO=TCP " */
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nf_log_buf_add(m, "PROTO=TCP ");
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if (fragment)
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return 0;
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/* Max length: 25 "INCOMPLETE [65535 bytes] " */
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th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
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if (th == NULL) {
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nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", skb->len - offset);
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return 1;
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}
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/* Max length: 20 "SPT=65535 DPT=65535 " */
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nf_log_buf_add(m, "SPT=%u DPT=%u ",
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ntohs(th->source), ntohs(th->dest));
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/* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */
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if (logflags & NF_LOG_TCPSEQ) {
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nf_log_buf_add(m, "SEQ=%u ACK=%u ",
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ntohl(th->seq), ntohl(th->ack_seq));
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}
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/* Max length: 13 "WINDOW=65535 " */
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nf_log_buf_add(m, "WINDOW=%u ", ntohs(th->window));
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/* Max length: 9 "RES=0x3C " */
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nf_log_buf_add(m, "RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) &
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TCP_RESERVED_BITS) >> 22));
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/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
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if (th->cwr)
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nf_log_buf_add(m, "CWR ");
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if (th->ece)
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nf_log_buf_add(m, "ECE ");
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if (th->urg)
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nf_log_buf_add(m, "URG ");
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if (th->ack)
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nf_log_buf_add(m, "ACK ");
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if (th->psh)
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nf_log_buf_add(m, "PSH ");
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if (th->rst)
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nf_log_buf_add(m, "RST ");
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if (th->syn)
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nf_log_buf_add(m, "SYN ");
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if (th->fin)
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nf_log_buf_add(m, "FIN ");
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/* Max length: 11 "URGP=65535 " */
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nf_log_buf_add(m, "URGP=%u ", ntohs(th->urg_ptr));
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if ((logflags & NF_LOG_TCPOPT) && th->doff*4 > sizeof(struct tcphdr)) {
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u_int8_t _opt[60 - sizeof(struct tcphdr)];
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const u_int8_t *op;
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unsigned int i;
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unsigned int optsize = th->doff*4 - sizeof(struct tcphdr);
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op = skb_header_pointer(skb, offset + sizeof(struct tcphdr),
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optsize, _opt);
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if (op == NULL) {
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nf_log_buf_add(m, "OPT (TRUNCATED)");
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return 1;
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}
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/* Max length: 127 "OPT (" 15*4*2chars ") " */
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nf_log_buf_add(m, "OPT (");
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for (i = 0; i < optsize; i++)
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nf_log_buf_add(m, "%02X", op[i]);
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nf_log_buf_add(m, ") ");
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(nf_log_dump_tcp_header);
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void nf_log_dump_sk_uid_gid(struct net *net, struct nf_log_buf *m,
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struct sock *sk)
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{
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if (!sk || !sk_fullsock(sk) || !net_eq(net, sock_net(sk)))
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return;
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read_lock_bh(&sk->sk_callback_lock);
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if (sk->sk_socket && sk->sk_socket->file) {
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const struct cred *cred = sk->sk_socket->file->f_cred;
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nf_log_buf_add(m, "UID=%u GID=%u ",
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from_kuid_munged(&init_user_ns, cred->fsuid),
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from_kgid_munged(&init_user_ns, cred->fsgid));
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}
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read_unlock_bh(&sk->sk_callback_lock);
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}
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EXPORT_SYMBOL_GPL(nf_log_dump_sk_uid_gid);
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void
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nf_log_dump_packet_common(struct nf_log_buf *m, u_int8_t pf,
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unsigned int hooknum, const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const struct nf_loginfo *loginfo, const char *prefix)
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{
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const struct net_device *physoutdev __maybe_unused;
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const struct net_device *physindev __maybe_unused;
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nf_log_buf_add(m, KERN_SOH "%c%sIN=%s OUT=%s ",
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'0' + loginfo->u.log.level, prefix,
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in ? in->name : "",
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out ? out->name : "");
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#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
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physindev = nf_bridge_get_physindev(skb);
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if (physindev && in != physindev)
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nf_log_buf_add(m, "PHYSIN=%s ", physindev->name);
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physoutdev = nf_bridge_get_physoutdev(skb);
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if (physoutdev && out != physoutdev)
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nf_log_buf_add(m, "PHYSOUT=%s ", physoutdev->name);
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#endif
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}
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EXPORT_SYMBOL_GPL(nf_log_dump_packet_common);
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void nf_log_dump_vlan(struct nf_log_buf *m, const struct sk_buff *skb)
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{
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u16 vid;
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if (!skb_vlan_tag_present(skb))
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return;
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vid = skb_vlan_tag_get(skb);
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nf_log_buf_add(m, "VPROTO=%04x VID=%u ", ntohs(skb->vlan_proto), vid);
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}
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EXPORT_SYMBOL_GPL(nf_log_dump_vlan);
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/* bridge and netdev logging families share this code. */
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void nf_log_l2packet(struct net *net, u_int8_t pf,
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__be16 protocol,
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unsigned int hooknum,
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const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const struct nf_loginfo *loginfo,
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const char *prefix)
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{
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switch (protocol) {
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case htons(ETH_P_IP):
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nf_log_packet(net, NFPROTO_IPV4, hooknum, skb, in, out,
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loginfo, "%s", prefix);
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break;
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case htons(ETH_P_IPV6):
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nf_log_packet(net, NFPROTO_IPV6, hooknum, skb, in, out,
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loginfo, "%s", prefix);
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break;
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case htons(ETH_P_ARP):
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case htons(ETH_P_RARP):
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nf_log_packet(net, NFPROTO_ARP, hooknum, skb, in, out,
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loginfo, "%s", prefix);
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break;
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}
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}
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EXPORT_SYMBOL_GPL(nf_log_l2packet);
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static int __init nf_log_common_init(void)
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{
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return 0;
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}
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static void __exit nf_log_common_exit(void) {}
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module_init(nf_log_common_init);
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module_exit(nf_log_common_exit);
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MODULE_LICENSE("GPL");
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