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netfilter: nf_ct_sip: consolidate NAT hook functions
There are currently seven different NAT hooks used in both
nf_conntrack_sip and nf_nat_sip, each of the hooks is exported in
nf_conntrack_sip, then set from the nf_nat_sip NAT helper.
And because each of them is exported there is quite some overhead
introduced due of this.
By introducing nf_nat_sip_hooks I am able to reduce both text/data
somewhat. For nf_conntrack_sip e. g. I get
text data bss dec
old 15243 5256 32 20531
new 15010 5192 32 20234
Signed-off-by: Holger Eitzenberger <holger@eitzenberger.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
holger@eitzenberger.org
Pablo Neira Ayuso
parent
afff14f608
commit
180cf72f56
@ -107,55 +107,64 @@ enum sdp_header_types {
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SDP_HDR_MEDIA,
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};
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extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen);
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extern void (*nf_nat_sip_seq_adjust_hook)(struct sk_buff *skb,
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unsigned int protoff, s16 off);
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extern unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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struct nf_conntrack_expect *exp,
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unsigned int matchoff,
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unsigned int matchlen);
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extern unsigned int (*nf_nat_sdp_addr_hook)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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unsigned int sdpoff,
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enum sdp_header_types type,
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enum sdp_header_types term,
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const union nf_inet_addr *addr);
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extern unsigned int (*nf_nat_sdp_port_hook)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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unsigned int matchoff,
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unsigned int matchlen,
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u_int16_t port);
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extern unsigned int (*nf_nat_sdp_session_hook)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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unsigned int sdpoff,
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const union nf_inet_addr *addr);
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extern unsigned int (*nf_nat_sdp_media_hook)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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struct nf_conntrack_expect *rtp_exp,
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struct nf_conntrack_expect *rtcp_exp,
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unsigned int mediaoff,
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unsigned int medialen,
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union nf_inet_addr *rtp_addr);
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struct nf_nat_sip_hooks {
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unsigned int (*msg)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen);
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void (*seq_adjust)(struct sk_buff *skb,
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unsigned int protoff, s16 off);
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unsigned int (*expect)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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struct nf_conntrack_expect *exp,
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unsigned int matchoff,
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unsigned int matchlen);
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unsigned int (*sdp_addr)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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unsigned int sdpoff,
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enum sdp_header_types type,
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enum sdp_header_types term,
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const union nf_inet_addr *addr);
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unsigned int (*sdp_port)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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unsigned int matchoff,
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unsigned int matchlen,
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u_int16_t port);
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unsigned int (*sdp_session)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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unsigned int sdpoff,
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const union nf_inet_addr *addr);
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unsigned int (*sdp_media)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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struct nf_conntrack_expect *rtp_exp,
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struct nf_conntrack_expect *rtcp_exp,
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unsigned int mediaoff,
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unsigned int medialen,
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union nf_inet_addr *rtp_addr);
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};
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extern const struct nf_nat_sip_hooks *nf_nat_sip_hooks;
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extern int ct_sip_parse_request(const struct nf_conn *ct,
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const char *dptr, unsigned int datalen,
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@ -52,66 +52,8 @@ module_param(sip_direct_media, int, 0600);
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MODULE_PARM_DESC(sip_direct_media, "Expect Media streams between signalling "
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"endpoints only (default 1)");
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unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb, unsigned int protoff,
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unsigned int dataoff, const char **dptr,
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unsigned int *datalen) __read_mostly;
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EXPORT_SYMBOL_GPL(nf_nat_sip_hook);
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void (*nf_nat_sip_seq_adjust_hook)(struct sk_buff *skb, unsigned int protoff,
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s16 off) __read_mostly;
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EXPORT_SYMBOL_GPL(nf_nat_sip_seq_adjust_hook);
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unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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struct nf_conntrack_expect *exp,
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unsigned int matchoff,
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unsigned int matchlen) __read_mostly;
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EXPORT_SYMBOL_GPL(nf_nat_sip_expect_hook);
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unsigned int (*nf_nat_sdp_addr_hook)(struct sk_buff *skb, unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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unsigned int sdpoff,
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enum sdp_header_types type,
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enum sdp_header_types term,
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const union nf_inet_addr *addr)
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__read_mostly;
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EXPORT_SYMBOL_GPL(nf_nat_sdp_addr_hook);
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unsigned int (*nf_nat_sdp_port_hook)(struct sk_buff *skb, unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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unsigned int matchoff,
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unsigned int matchlen,
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u_int16_t port) __read_mostly;
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EXPORT_SYMBOL_GPL(nf_nat_sdp_port_hook);
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unsigned int (*nf_nat_sdp_session_hook)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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unsigned int sdpoff,
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const union nf_inet_addr *addr)
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__read_mostly;
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EXPORT_SYMBOL_GPL(nf_nat_sdp_session_hook);
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unsigned int (*nf_nat_sdp_media_hook)(struct sk_buff *skb, unsigned int protoff,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen,
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struct nf_conntrack_expect *rtp_exp,
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struct nf_conntrack_expect *rtcp_exp,
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unsigned int mediaoff,
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unsigned int medialen,
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union nf_inet_addr *rtp_addr)
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__read_mostly;
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EXPORT_SYMBOL_GPL(nf_nat_sdp_media_hook);
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const struct nf_nat_sip_hooks *nf_nat_sip_hooks;
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EXPORT_SYMBOL_GPL(nf_nat_sip_hooks);
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static int string_len(const struct nf_conn *ct, const char *dptr,
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const char *limit, int *shift)
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@ -914,8 +856,7 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int protoff,
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int direct_rtp = 0, skip_expect = 0, ret = NF_DROP;
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u_int16_t base_port;
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__be16 rtp_port, rtcp_port;
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typeof(nf_nat_sdp_port_hook) nf_nat_sdp_port;
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typeof(nf_nat_sdp_media_hook) nf_nat_sdp_media;
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const struct nf_nat_sip_hooks *hooks;
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saddr = NULL;
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if (sip_direct_media) {
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@ -972,9 +913,9 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int protoff,
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rtcp_port = htons(base_port + 1);
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if (direct_rtp) {
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nf_nat_sdp_port = rcu_dereference(nf_nat_sdp_port_hook);
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if (nf_nat_sdp_port &&
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!nf_nat_sdp_port(skb, protoff, dataoff, dptr, datalen,
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hooks = rcu_dereference(nf_nat_sip_hooks);
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if (hooks &&
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!hooks->sdp_port(skb, protoff, dataoff, dptr, datalen,
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mediaoff, medialen, ntohs(rtp_port)))
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goto err1;
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}
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@ -996,10 +937,10 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int protoff,
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nf_ct_expect_init(rtcp_exp, class, nf_ct_l3num(ct), saddr, daddr,
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IPPROTO_UDP, NULL, &rtcp_port);
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nf_nat_sdp_media = rcu_dereference(nf_nat_sdp_media_hook);
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if (nf_nat_sdp_media && ct->status & IPS_NAT_MASK && !direct_rtp)
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ret = nf_nat_sdp_media(skb, protoff, dataoff, dptr, datalen,
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rtp_exp, rtcp_exp,
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hooks = rcu_dereference(nf_nat_sip_hooks);
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if (hooks && ct->status & IPS_NAT_MASK && !direct_rtp)
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ret = hooks->sdp_media(skb, protoff, dataoff, dptr,
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datalen, rtp_exp, rtcp_exp,
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mediaoff, medialen, daddr);
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else {
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if (nf_ct_expect_related(rtp_exp) == 0) {
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@ -1053,13 +994,12 @@ static int process_sdp(struct sk_buff *skb, unsigned int protoff,
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unsigned int caddr_len, maddr_len;
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unsigned int i;
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union nf_inet_addr caddr, maddr, rtp_addr;
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const struct nf_nat_sip_hooks *hooks;
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unsigned int port;
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const struct sdp_media_type *t;
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int ret = NF_ACCEPT;
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typeof(nf_nat_sdp_addr_hook) nf_nat_sdp_addr;
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typeof(nf_nat_sdp_session_hook) nf_nat_sdp_session;
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nf_nat_sdp_addr = rcu_dereference(nf_nat_sdp_addr_hook);
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hooks = rcu_dereference(nf_nat_sip_hooks);
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/* Find beginning of session description */
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if (ct_sip_get_sdp_header(ct, *dptr, 0, *datalen,
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@ -1127,10 +1067,11 @@ static int process_sdp(struct sk_buff *skb, unsigned int protoff,
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}
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/* Update media connection address if present */
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if (maddr_len && nf_nat_sdp_addr && ct->status & IPS_NAT_MASK) {
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ret = nf_nat_sdp_addr(skb, protoff, dataoff,
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if (maddr_len && hooks && ct->status & IPS_NAT_MASK) {
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ret = hooks->sdp_addr(skb, protoff, dataoff,
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dptr, datalen, mediaoff,
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SDP_HDR_CONNECTION, SDP_HDR_MEDIA,
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SDP_HDR_CONNECTION,
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SDP_HDR_MEDIA,
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&rtp_addr);
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if (ret != NF_ACCEPT) {
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nf_ct_helper_log(skb, ct, "cannot mangle SDP");
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@ -1141,10 +1082,11 @@ static int process_sdp(struct sk_buff *skb, unsigned int protoff,
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}
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/* Update session connection and owner addresses */
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nf_nat_sdp_session = rcu_dereference(nf_nat_sdp_session_hook);
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if (nf_nat_sdp_session && ct->status & IPS_NAT_MASK)
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ret = nf_nat_sdp_session(skb, protoff, dataoff,
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dptr, datalen, sdpoff, &rtp_addr);
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hooks = rcu_dereference(nf_nat_sip_hooks);
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if (hooks && ct->status & IPS_NAT_MASK)
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ret = hooks->sdp_session(skb, protoff, dataoff,
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dptr, datalen, sdpoff,
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&rtp_addr);
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return ret;
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}
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@ -1244,11 +1186,11 @@ static int process_register_request(struct sk_buff *skb, unsigned int protoff,
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unsigned int matchoff, matchlen;
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struct nf_conntrack_expect *exp;
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union nf_inet_addr *saddr, daddr;
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const struct nf_nat_sip_hooks *hooks;
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__be16 port;
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u8 proto;
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unsigned int expires = 0;
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int ret;
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typeof(nf_nat_sip_expect_hook) nf_nat_sip_expect;
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/* Expected connections can not register again. */
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if (ct->status & IPS_EXPECTED)
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@ -1311,10 +1253,10 @@ static int process_register_request(struct sk_buff *skb, unsigned int protoff,
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exp->helper = nfct_help(ct)->helper;
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exp->flags = NF_CT_EXPECT_PERMANENT | NF_CT_EXPECT_INACTIVE;
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nf_nat_sip_expect = rcu_dereference(nf_nat_sip_expect_hook);
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if (nf_nat_sip_expect && ct->status & IPS_NAT_MASK)
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ret = nf_nat_sip_expect(skb, protoff, dataoff, dptr, datalen,
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exp, matchoff, matchlen);
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hooks = rcu_dereference(nf_nat_sip_hooks);
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if (hooks && ct->status & IPS_NAT_MASK)
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ret = hooks->expect(skb, protoff, dataoff, dptr, datalen,
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exp, matchoff, matchlen);
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else {
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if (nf_ct_expect_related(exp) != 0) {
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nf_ct_helper_log(skb, ct, "cannot add expectation");
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@ -1517,7 +1459,7 @@ static int process_sip_msg(struct sk_buff *skb, struct nf_conn *ct,
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unsigned int protoff, unsigned int dataoff,
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const char **dptr, unsigned int *datalen)
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{
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typeof(nf_nat_sip_hook) nf_nat_sip;
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const struct nf_nat_sip_hooks *hooks;
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int ret;
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if (strnicmp(*dptr, "SIP/2.0 ", strlen("SIP/2.0 ")) != 0)
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@ -1526,9 +1468,9 @@ static int process_sip_msg(struct sk_buff *skb, struct nf_conn *ct,
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ret = process_sip_response(skb, protoff, dataoff, dptr, datalen);
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if (ret == NF_ACCEPT && ct->status & IPS_NAT_MASK) {
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nf_nat_sip = rcu_dereference(nf_nat_sip_hook);
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if (nf_nat_sip && !nf_nat_sip(skb, protoff, dataoff,
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dptr, datalen)) {
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hooks = rcu_dereference(nf_nat_sip_hooks);
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if (hooks && !hooks->msg(skb, protoff, dataoff,
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dptr, datalen)) {
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nf_ct_helper_log(skb, ct, "cannot NAT SIP message");
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ret = NF_DROP;
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}
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@ -1548,7 +1490,6 @@ static int sip_help_tcp(struct sk_buff *skb, unsigned int protoff,
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s16 diff, tdiff = 0;
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int ret = NF_ACCEPT;
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bool term;
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typeof(nf_nat_sip_seq_adjust_hook) nf_nat_sip_seq_adjust;
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if (ctinfo != IP_CT_ESTABLISHED &&
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ctinfo != IP_CT_ESTABLISHED_REPLY)
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@ -1612,9 +1553,11 @@ static int sip_help_tcp(struct sk_buff *skb, unsigned int protoff,
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}
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if (ret == NF_ACCEPT && ct->status & IPS_NAT_MASK) {
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nf_nat_sip_seq_adjust = rcu_dereference(nf_nat_sip_seq_adjust_hook);
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if (nf_nat_sip_seq_adjust)
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nf_nat_sip_seq_adjust(skb, protoff, tdiff);
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const struct nf_nat_sip_hooks *hooks;
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hooks = rcu_dereference(nf_nat_sip_hooks);
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if (hooks)
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hooks->seq_adjust(skb, protoff, tdiff);
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}
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return ret;
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@ -625,33 +625,26 @@ static struct nf_ct_helper_expectfn sip_nat = {
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static void __exit nf_nat_sip_fini(void)
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{
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RCU_INIT_POINTER(nf_nat_sip_hook, NULL);
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RCU_INIT_POINTER(nf_nat_sip_seq_adjust_hook, NULL);
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RCU_INIT_POINTER(nf_nat_sip_expect_hook, NULL);
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RCU_INIT_POINTER(nf_nat_sdp_addr_hook, NULL);
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RCU_INIT_POINTER(nf_nat_sdp_port_hook, NULL);
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RCU_INIT_POINTER(nf_nat_sdp_session_hook, NULL);
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RCU_INIT_POINTER(nf_nat_sdp_media_hook, NULL);
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RCU_INIT_POINTER(nf_nat_sip_hooks, NULL);
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nf_ct_helper_expectfn_unregister(&sip_nat);
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synchronize_rcu();
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}
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static const struct nf_nat_sip_hooks sip_hooks = {
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.msg = nf_nat_sip,
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.seq_adjust = nf_nat_sip_seq_adjust,
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.expect = nf_nat_sip_expect,
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.sdp_addr = nf_nat_sdp_addr,
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.sdp_port = nf_nat_sdp_port,
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.sdp_session = nf_nat_sdp_session,
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.sdp_media = nf_nat_sdp_media,
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};
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static int __init nf_nat_sip_init(void)
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{
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BUG_ON(nf_nat_sip_hook != NULL);
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BUG_ON(nf_nat_sip_seq_adjust_hook != NULL);
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BUG_ON(nf_nat_sip_expect_hook != NULL);
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BUG_ON(nf_nat_sdp_addr_hook != NULL);
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BUG_ON(nf_nat_sdp_port_hook != NULL);
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BUG_ON(nf_nat_sdp_session_hook != NULL);
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BUG_ON(nf_nat_sdp_media_hook != NULL);
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RCU_INIT_POINTER(nf_nat_sip_hook, nf_nat_sip);
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RCU_INIT_POINTER(nf_nat_sip_seq_adjust_hook, nf_nat_sip_seq_adjust);
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RCU_INIT_POINTER(nf_nat_sip_expect_hook, nf_nat_sip_expect);
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RCU_INIT_POINTER(nf_nat_sdp_addr_hook, nf_nat_sdp_addr);
|
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RCU_INIT_POINTER(nf_nat_sdp_port_hook, nf_nat_sdp_port);
|
||||
RCU_INIT_POINTER(nf_nat_sdp_session_hook, nf_nat_sdp_session);
|
||||
RCU_INIT_POINTER(nf_nat_sdp_media_hook, nf_nat_sdp_media);
|
||||
BUG_ON(nf_nat_sip_hooks != NULL);
|
||||
RCU_INIT_POINTER(nf_nat_sip_hooks, &sip_hooks);
|
||||
nf_ct_helper_expectfn_register(&sip_nat);
|
||||
return 0;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user