netfilter: nf_log_ipv6: merge with nf_log_syslog

This removes the nf_log_ipv6 module, the functionality is now
provided by nf_log_syslog.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

3 files changed, 4 insertions, 431 deletions

diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 262bb51a2d99..f22233e44ee9 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -69,7 +69,10 @@ config NF_REJECT_IPV6
 config NF_LOG_IPV6
 	tristate "IPv6 packet logging"
 	default m if NETFILTER_ADVANCED=n
-	select NF_LOG_COMMON
+	select NF_LOG_SYSLOG
+	help
+	  This is a backwards-compat option for the user's convenience
+	  (e.g. when running oldconfig). It selects CONFIG_NF_LOG_SYSLOG.
 
 config IP6_NF_IPTABLES
 	tristate "IP6 tables support (required for filtering)"
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index 731a74c60dca..b85383606df7 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -18,9 +18,6 @@ obj-$(CONFIG_NF_DEFRAG_IPV6) += nf_defrag_ipv6.o
 obj-$(CONFIG_NF_SOCKET_IPV6) += nf_socket_ipv6.o
 obj-$(CONFIG_NF_TPROXY_IPV6) += nf_tproxy_ipv6.o
 
-# logging
-obj-$(CONFIG_NF_LOG_IPV6) += nf_log_ipv6.o
-
 # reject
 obj-$(CONFIG_NF_REJECT_IPV6) += nf_reject_ipv6.o
 
diff --git a/net/ipv6/netfilter/nf_log_ipv6.c b/net/ipv6/netfilter/nf_log_ipv6.c
deleted file mode 100644
index 8210ff34ed9b..000000000000
--- a/net/ipv6/netfilter/nf_log_ipv6.c
+++ /dev/null
@@ -1,427 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/skbuff.h>
-#include <linux/if_arp.h>
-#include <linux/ip.h>
-#include <net/ipv6.h>
-#include <net/icmp.h>
-#include <net/udp.h>
-#include <net/tcp.h>
-#include <net/route.h>
-
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv6.h>
-#include <linux/netfilter/xt_LOG.h>
-#include <net/netfilter/nf_log.h>
-
-static const struct nf_loginfo default_loginfo = {
-	.type	= NF_LOG_TYPE_LOG,
-	.u = {
-		.log = {
-			.level	  = LOGLEVEL_NOTICE,
-			.logflags = NF_LOG_DEFAULT_MASK,
-		},
-	},
-};
-
-/* One level of recursion won't kill us */
-static void dump_ipv6_packet(struct net *net, struct nf_log_buf *m,
-			     const struct nf_loginfo *info,
-			     const struct sk_buff *skb, unsigned int ip6hoff,
-			     int recurse)
-{
-	u_int8_t currenthdr;
-	int fragment;
-	struct ipv6hdr _ip6h;
-	const struct ipv6hdr *ih;
-	unsigned int ptr;
-	unsigned int hdrlen = 0;
-	unsigned int logflags;
-
-	if (info->type == NF_LOG_TYPE_LOG)
-		logflags = info->u.log.logflags;
-	else
-		logflags = NF_LOG_DEFAULT_MASK;
-
-	ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
-	if (ih == NULL) {
-		nf_log_buf_add(m, "TRUNCATED");
-		return;
-	}
-
-	/* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */
-	nf_log_buf_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr);
-
-	/* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */
-	nf_log_buf_add(m, "LEN=%zu TC=%u HOPLIMIT=%u FLOWLBL=%u ",
-	       ntohs(ih->payload_len) + sizeof(struct ipv6hdr),
-	       (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20,
-	       ih->hop_limit,
-	       (ntohl(*(__be32 *)ih) & 0x000fffff));
-
-	fragment = 0;
-	ptr = ip6hoff + sizeof(struct ipv6hdr);
-	currenthdr = ih->nexthdr;
-	while (currenthdr != NEXTHDR_NONE && nf_ip6_ext_hdr(currenthdr)) {
-		struct ipv6_opt_hdr _hdr;
-		const struct ipv6_opt_hdr *hp;
-
-		hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
-		if (hp == NULL) {
-			nf_log_buf_add(m, "TRUNCATED");
-			return;
-		}
-
-		/* Max length: 48 "OPT (...) " */
-		if (logflags & NF_LOG_IPOPT)
-			nf_log_buf_add(m, "OPT ( ");
-
-		switch (currenthdr) {
-		case IPPROTO_FRAGMENT: {
-			struct frag_hdr _fhdr;
-			const struct frag_hdr *fh;
-
-			nf_log_buf_add(m, "FRAG:");
-			fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
-						&_fhdr);
-			if (fh == NULL) {
-				nf_log_buf_add(m, "TRUNCATED ");
-				return;
-			}
-
-			/* Max length: 6 "65535 " */
-			nf_log_buf_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
-
-			/* Max length: 11 "INCOMPLETE " */
-			if (fh->frag_off & htons(0x0001))
-				nf_log_buf_add(m, "INCOMPLETE ");
-
-			nf_log_buf_add(m, "ID:%08x ",
-				       ntohl(fh->identification));
-
-			if (ntohs(fh->frag_off) & 0xFFF8)
-				fragment = 1;
-
-			hdrlen = 8;
-
-			break;
-		}
-		case IPPROTO_DSTOPTS:
-		case IPPROTO_ROUTING:
-		case IPPROTO_HOPOPTS:
-			if (fragment) {
-				if (logflags & NF_LOG_IPOPT)
-					nf_log_buf_add(m, ")");
-				return;
-			}
-			hdrlen = ipv6_optlen(hp);
-			break;
-		/* Max Length */
-		case IPPROTO_AH:
-			if (logflags & NF_LOG_IPOPT) {
-				struct ip_auth_hdr _ahdr;
-				const struct ip_auth_hdr *ah;
-
-				/* Max length: 3 "AH " */
-				nf_log_buf_add(m, "AH ");
-
-				if (fragment) {
-					nf_log_buf_add(m, ")");
-					return;
-				}
-
-				ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
-							&_ahdr);
-				if (ah == NULL) {
-					/*
-					 * Max length: 26 "INCOMPLETE [65535
-					 *  bytes] )"
-					 */
-					nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
-						       skb->len - ptr);
-					return;
-				}
-
-				/* Length: 15 "SPI=0xF1234567 */
-				nf_log_buf_add(m, "SPI=0x%x ", ntohl(ah->spi));
-
-			}
-
-			hdrlen = ipv6_authlen(hp);
-			break;
-		case IPPROTO_ESP:
-			if (logflags & NF_LOG_IPOPT) {
-				struct ip_esp_hdr _esph;
-				const struct ip_esp_hdr *eh;
-
-				/* Max length: 4 "ESP " */
-				nf_log_buf_add(m, "ESP ");
-
-				if (fragment) {
-					nf_log_buf_add(m, ")");
-					return;
-				}
-
-				/*
-				 * Max length: 26 "INCOMPLETE [65535 bytes] )"
-				 */
-				eh = skb_header_pointer(skb, ptr, sizeof(_esph),
-							&_esph);
-				if (eh == NULL) {
-					nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
-						       skb->len - ptr);
-					return;
-				}
-
-				/* Length: 16 "SPI=0xF1234567 )" */
-				nf_log_buf_add(m, "SPI=0x%x )",
-					       ntohl(eh->spi));
-			}
-			return;
-		default:
-			/* Max length: 20 "Unknown Ext Hdr 255" */
-			nf_log_buf_add(m, "Unknown Ext Hdr %u", currenthdr);
-			return;
-		}
-		if (logflags & NF_LOG_IPOPT)
-			nf_log_buf_add(m, ") ");
-
-		currenthdr = hp->nexthdr;
-		ptr += hdrlen;
-	}
-
-	switch (currenthdr) {
-	case IPPROTO_TCP:
-		if (nf_log_dump_tcp_header(m, skb, currenthdr, fragment,
-					   ptr, logflags))
-			return;
-		break;
-	case IPPROTO_UDP:
-	case IPPROTO_UDPLITE:
-		if (nf_log_dump_udp_header(m, skb, currenthdr, fragment, ptr))
-			return;
-		break;
-	case IPPROTO_ICMPV6: {
-		struct icmp6hdr _icmp6h;
-		const struct icmp6hdr *ic;
-
-		/* Max length: 13 "PROTO=ICMPv6 " */
-		nf_log_buf_add(m, "PROTO=ICMPv6 ");
-
-		if (fragment)
-			break;
-
-		/* Max length: 25 "INCOMPLETE [65535 bytes] " */
-		ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
-		if (ic == NULL) {
-			nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
-				       skb->len - ptr);
-			return;
-		}
-
-		/* Max length: 18 "TYPE=255 CODE=255 " */
-		nf_log_buf_add(m, "TYPE=%u CODE=%u ",
-			       ic->icmp6_type, ic->icmp6_code);
-
-		switch (ic->icmp6_type) {
-		case ICMPV6_ECHO_REQUEST:
-		case ICMPV6_ECHO_REPLY:
-			/* Max length: 19 "ID=65535 SEQ=65535 " */
-			nf_log_buf_add(m, "ID=%u SEQ=%u ",
-				ntohs(ic->icmp6_identifier),
-				ntohs(ic->icmp6_sequence));
-			break;
-		case ICMPV6_MGM_QUERY:
-		case ICMPV6_MGM_REPORT:
-		case ICMPV6_MGM_REDUCTION:
-			break;
-
-		case ICMPV6_PARAMPROB:
-			/* Max length: 17 "POINTER=ffffffff " */
-			nf_log_buf_add(m, "POINTER=%08x ",
-				       ntohl(ic->icmp6_pointer));
-			fallthrough;
-		case ICMPV6_DEST_UNREACH:
-		case ICMPV6_PKT_TOOBIG:
-		case ICMPV6_TIME_EXCEED:
-			/* Max length: 3+maxlen */
-			if (recurse) {
-				nf_log_buf_add(m, "[");
-				dump_ipv6_packet(net, m, info, skb,
-						 ptr + sizeof(_icmp6h), 0);
-				nf_log_buf_add(m, "] ");
-			}
-
-			/* Max length: 10 "MTU=65535 " */
-			if (ic->icmp6_type == ICMPV6_PKT_TOOBIG) {
-				nf_log_buf_add(m, "MTU=%u ",
-					       ntohl(ic->icmp6_mtu));
-			}
-		}
-		break;
-	}
-	/* Max length: 10 "PROTO=255 " */
-	default:
-		nf_log_buf_add(m, "PROTO=%u ", currenthdr);
-	}
-
-	/* Max length: 15 "UID=4294967295 " */
-	if ((logflags & NF_LOG_UID) && recurse)
-		nf_log_dump_sk_uid_gid(net, m, skb->sk);
-
-	/* Max length: 16 "MARK=0xFFFFFFFF " */
-	if (recurse && skb->mark)
-		nf_log_buf_add(m, "MARK=0x%x ", skb->mark);
-}
-
-static void dump_ipv6_mac_header(struct nf_log_buf *m,
-				 const struct nf_loginfo *info,
-				 const struct sk_buff *skb)
-{
-	struct net_device *dev = skb->dev;
-	unsigned int logflags = 0;
-
-	if (info->type == NF_LOG_TYPE_LOG)
-		logflags = info->u.log.logflags;
-
-	if (!(logflags & NF_LOG_MACDECODE))
-		goto fallback;
-
-	switch (dev->type) {
-	case ARPHRD_ETHER:
-		nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM ",
-			       eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest);
-		nf_log_dump_vlan(m, skb);
-		nf_log_buf_add(m, "MACPROTO=%04x ",
-			       ntohs(eth_hdr(skb)->h_proto));
-		return;
-	default:
-		break;
-	}
-
-fallback:
-	nf_log_buf_add(m, "MAC=");
-	if (dev->hard_header_len &&
-	    skb->mac_header != skb->network_header) {
-		const unsigned char *p = skb_mac_header(skb);
-		unsigned int len = dev->hard_header_len;
-		unsigned int i;
-
-		if (dev->type == ARPHRD_SIT) {
-			p -= ETH_HLEN;
-
-			if (p < skb->head)
-				p = NULL;
-		}
-
-		if (p != NULL) {
-			nf_log_buf_add(m, "%02x", *p++);
-			for (i = 1; i < len; i++)
-				nf_log_buf_add(m, ":%02x", *p++);
-		}
-		nf_log_buf_add(m, " ");
-
-		if (dev->type == ARPHRD_SIT) {
-			const struct iphdr *iph =
-				(struct iphdr *)skb_mac_header(skb);
-			nf_log_buf_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr,
-				       &iph->daddr);
-		}
-	} else {
-		nf_log_buf_add(m, " ");
-	}
-}
-
-static void nf_log_ip6_packet(struct net *net, u_int8_t pf,
-			      unsigned int hooknum, const struct sk_buff *skb,
-			      const struct net_device *in,
-			      const struct net_device *out,
-			      const struct nf_loginfo *loginfo,
-			      const char *prefix)
-{
-	struct nf_log_buf *m;
-
-	/* FIXME: Disabled from containers until syslog ns is supported */
-	if (!net_eq(net, &init_net) && !sysctl_nf_log_all_netns)
-		return;
-
-	m = nf_log_buf_open();
-
-	if (!loginfo)
-		loginfo = &default_loginfo;
-
-	nf_log_dump_packet_common(m, pf, hooknum, skb, in, out,
-				  loginfo, prefix);
-
-	if (in != NULL)
-		dump_ipv6_mac_header(m, loginfo, skb);
-
-	dump_ipv6_packet(net, m, loginfo, skb, skb_network_offset(skb), 1);
-
-	nf_log_buf_close(m);
-}
-
-static struct nf_logger nf_ip6_logger __read_mostly = {
-	.name		= "nf_log_ipv6",
-	.type		= NF_LOG_TYPE_LOG,
-	.logfn		= nf_log_ip6_packet,
-	.me		= THIS_MODULE,
-};
-
-static int __net_init nf_log_ipv6_net_init(struct net *net)
-{
-	return nf_log_set(net, NFPROTO_IPV6, &nf_ip6_logger);
-}
-
-static void __net_exit nf_log_ipv6_net_exit(struct net *net)
-{
-	nf_log_unset(net, &nf_ip6_logger);
-}
-
-static struct pernet_operations nf_log_ipv6_net_ops = {
-	.init = nf_log_ipv6_net_init,
-	.exit = nf_log_ipv6_net_exit,
-};
-
-static int __init nf_log_ipv6_init(void)
-{
-	int ret;
-
-	ret = register_pernet_subsys(&nf_log_ipv6_net_ops);
-	if (ret < 0)
-		return ret;
-
-	ret = nf_log_register(NFPROTO_IPV6, &nf_ip6_logger);
-	if (ret < 0) {
-		pr_err("failed to register logger\n");
-		goto err1;
-	}
-
-	return 0;
-
-err1:
-	unregister_pernet_subsys(&nf_log_ipv6_net_ops);
-	return ret;
-}
-
-static void __exit nf_log_ipv6_exit(void)
-{
-	unregister_pernet_subsys(&nf_log_ipv6_net_ops);
-	nf_log_unregister(&nf_ip6_logger);
-}
-
-module_init(nf_log_ipv6_init);
-module_exit(nf_log_ipv6_exit);
-
-MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-MODULE_DESCRIPTION("Netfilter IPv6 packet logging");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_NF_LOGGER(AF_INET6, 0);