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-rw-r--r--net/netfilter/nf_conntrack_sip.c82
1 files changed, 44 insertions, 38 deletions
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index 0ca2f2b5c2fa..0ec37d6a2df7 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -50,12 +50,13 @@ module_param(sip_direct_media, int, 0600);
MODULE_PARM_DESC(sip_direct_media, "Expect Media streams between signalling "
"endpoints only (default 1)");
-unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
+unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb, unsigned int dataoff,
const char **dptr,
unsigned int *datalen) __read_mostly;
EXPORT_SYMBOL_GPL(nf_nat_sip_hook);
unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
+ unsigned int dataoff,
const char **dptr,
unsigned int *datalen,
struct nf_conntrack_expect *exp,
@@ -63,17 +64,17 @@ unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
unsigned int matchlen) __read_mostly;
EXPORT_SYMBOL_GPL(nf_nat_sip_expect_hook);
-unsigned int (*nf_nat_sdp_addr_hook)(struct sk_buff *skb,
+unsigned int (*nf_nat_sdp_addr_hook)(struct sk_buff *skb, unsigned int dataoff,
const char **dptr,
- unsigned int dataoff,
unsigned int *datalen,
+ unsigned int sdpoff,
enum sdp_header_types type,
enum sdp_header_types term,
const union nf_inet_addr *addr)
__read_mostly;
EXPORT_SYMBOL_GPL(nf_nat_sdp_addr_hook);
-unsigned int (*nf_nat_sdp_port_hook)(struct sk_buff *skb,
+unsigned int (*nf_nat_sdp_port_hook)(struct sk_buff *skb, unsigned int dataoff,
const char **dptr,
unsigned int *datalen,
unsigned int matchoff,
@@ -82,14 +83,15 @@ unsigned int (*nf_nat_sdp_port_hook)(struct sk_buff *skb,
EXPORT_SYMBOL_GPL(nf_nat_sdp_port_hook);
unsigned int (*nf_nat_sdp_session_hook)(struct sk_buff *skb,
- const char **dptr,
unsigned int dataoff,
+ const char **dptr,
unsigned int *datalen,
+ unsigned int sdpoff,
const union nf_inet_addr *addr)
__read_mostly;
EXPORT_SYMBOL_GPL(nf_nat_sdp_session_hook);
-unsigned int (*nf_nat_sdp_media_hook)(struct sk_buff *skb,
+unsigned int (*nf_nat_sdp_media_hook)(struct sk_buff *skb, unsigned int dataoff,
const char **dptr,
unsigned int *datalen,
struct nf_conntrack_expect *rtp_exp,
@@ -729,7 +731,7 @@ static void flush_expectations(struct nf_conn *ct, bool media)
spin_unlock_bh(&nf_conntrack_lock);
}
-static int set_expected_rtp_rtcp(struct sk_buff *skb,
+static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int dataoff,
const char **dptr, unsigned int *datalen,
union nf_inet_addr *daddr, __be16 port,
enum sip_expectation_classes class,
@@ -806,7 +808,7 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb,
if (direct_rtp) {
nf_nat_sdp_port = rcu_dereference(nf_nat_sdp_port_hook);
if (nf_nat_sdp_port &&
- !nf_nat_sdp_port(skb, dptr, datalen,
+ !nf_nat_sdp_port(skb, dataoff, dptr, datalen,
mediaoff, medialen, ntohs(rtp_port)))
goto err1;
}
@@ -828,7 +830,8 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb,
nf_nat_sdp_media = rcu_dereference(nf_nat_sdp_media_hook);
if (nf_nat_sdp_media && ct->status & IPS_NAT_MASK && !direct_rtp)
- ret = nf_nat_sdp_media(skb, dptr, datalen, rtp_exp, rtcp_exp,
+ ret = nf_nat_sdp_media(skb, dataoff, dptr, datalen,
+ rtp_exp, rtcp_exp,
mediaoff, medialen, daddr);
else {
if (nf_ct_expect_related(rtp_exp) == 0) {
@@ -867,7 +870,7 @@ static const struct sdp_media_type *sdp_media_type(const char *dptr,
return NULL;
}
-static int process_sdp(struct sk_buff *skb,
+static int process_sdp(struct sk_buff *skb, unsigned int dataoff,
const char **dptr, unsigned int *datalen,
unsigned int cseq)
{
@@ -942,7 +945,7 @@ static int process_sdp(struct sk_buff *skb,
else
return NF_DROP;
- ret = set_expected_rtp_rtcp(skb, dptr, datalen,
+ ret = set_expected_rtp_rtcp(skb, dataoff, dptr, datalen,
&rtp_addr, htons(port), t->class,
mediaoff, medialen);
if (ret != NF_ACCEPT)
@@ -950,8 +953,9 @@ static int process_sdp(struct sk_buff *skb,
/* Update media connection address if present */
if (maddr_len && nf_nat_sdp_addr && ct->status & IPS_NAT_MASK) {
- ret = nf_nat_sdp_addr(skb, dptr, mediaoff, datalen,
- c_hdr, SDP_HDR_MEDIA, &rtp_addr);
+ ret = nf_nat_sdp_addr(skb, dataoff, dptr, datalen,
+ mediaoff, c_hdr, SDP_HDR_MEDIA,
+ &rtp_addr);
if (ret != NF_ACCEPT)
return ret;
}
@@ -961,14 +965,15 @@ static int process_sdp(struct sk_buff *skb,
/* Update session connection and owner addresses */
nf_nat_sdp_session = rcu_dereference(nf_nat_sdp_session_hook);
if (nf_nat_sdp_session && ct->status & IPS_NAT_MASK)
- ret = nf_nat_sdp_session(skb, dptr, sdpoff, datalen, &rtp_addr);
+ ret = nf_nat_sdp_session(skb, dataoff, dptr, datalen, sdpoff,
+ &rtp_addr);
if (ret == NF_ACCEPT && i > 0)
help->help.ct_sip_info.invite_cseq = cseq;
return ret;
}
-static int process_invite_response(struct sk_buff *skb,
+static int process_invite_response(struct sk_buff *skb, unsigned int dataoff,
const char **dptr, unsigned int *datalen,
unsigned int cseq, unsigned int code)
{
@@ -978,13 +983,13 @@ static int process_invite_response(struct sk_buff *skb,
if ((code >= 100 && code <= 199) ||
(code >= 200 && code <= 299))
- return process_sdp(skb, dptr, datalen, cseq);
+ return process_sdp(skb, dataoff, dptr, datalen, cseq);
else if (help->help.ct_sip_info.invite_cseq == cseq)
flush_expectations(ct, true);
return NF_ACCEPT;
}
-static int process_update_response(struct sk_buff *skb,
+static int process_update_response(struct sk_buff *skb, unsigned int dataoff,
const char **dptr, unsigned int *datalen,
unsigned int cseq, unsigned int code)
{
@@ -994,13 +999,13 @@ static int process_update_response(struct sk_buff *skb,
if ((code >= 100 && code <= 199) ||
(code >= 200 && code <= 299))
- return process_sdp(skb, dptr, datalen, cseq);
+ return process_sdp(skb, dataoff, dptr, datalen, cseq);
else if (help->help.ct_sip_info.invite_cseq == cseq)
flush_expectations(ct, true);
return NF_ACCEPT;
}
-static int process_prack_response(struct sk_buff *skb,
+static int process_prack_response(struct sk_buff *skb, unsigned int dataoff,
const char **dptr, unsigned int *datalen,
unsigned int cseq, unsigned int code)
{
@@ -1010,13 +1015,13 @@ static int process_prack_response(struct sk_buff *skb,
if ((code >= 100 && code <= 199) ||
(code >= 200 && code <= 299))
- return process_sdp(skb, dptr, datalen, cseq);
+ return process_sdp(skb, dataoff, dptr, datalen, cseq);
else if (help->help.ct_sip_info.invite_cseq == cseq)
flush_expectations(ct, true);
return NF_ACCEPT;
}
-static int process_bye_request(struct sk_buff *skb,
+static int process_bye_request(struct sk_buff *skb, unsigned int dataoff,
const char **dptr, unsigned int *datalen,
unsigned int cseq)
{
@@ -1031,7 +1036,7 @@ static int process_bye_request(struct sk_buff *skb,
* signalling connections. The expectation is marked inactive and is activated
* when receiving a response indicating success from the registrar.
*/
-static int process_register_request(struct sk_buff *skb,
+static int process_register_request(struct sk_buff *skb, unsigned int dataoff,
const char **dptr, unsigned int *datalen,
unsigned int cseq)
{
@@ -1101,7 +1106,7 @@ static int process_register_request(struct sk_buff *skb,
nf_nat_sip_expect = rcu_dereference(nf_nat_sip_expect_hook);
if (nf_nat_sip_expect && ct->status & IPS_NAT_MASK)
- ret = nf_nat_sip_expect(skb, dptr, datalen, exp,
+ ret = nf_nat_sip_expect(skb, dataoff, dptr, datalen, exp,
matchoff, matchlen);
else {
if (nf_ct_expect_related(exp) != 0)
@@ -1117,7 +1122,7 @@ store_cseq:
return ret;
}
-static int process_register_response(struct sk_buff *skb,
+static int process_register_response(struct sk_buff *skb, unsigned int dataoff,
const char **dptr, unsigned int *datalen,
unsigned int cseq, unsigned int code)
{
@@ -1127,7 +1132,7 @@ static int process_register_response(struct sk_buff *skb,
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
union nf_inet_addr addr;
__be16 port;
- unsigned int matchoff, matchlen, dataoff = 0;
+ unsigned int matchoff, matchlen, coff = 0;
unsigned int expires = 0;
int in_contact = 0, ret;
@@ -1154,7 +1159,7 @@ static int process_register_response(struct sk_buff *skb,
while (1) {
unsigned int c_expires = expires;
- ret = ct_sip_parse_header_uri(ct, *dptr, &dataoff, *datalen,
+ ret = ct_sip_parse_header_uri(ct, *dptr, &coff, *datalen,
SIP_HDR_CONTACT, &in_contact,
&matchoff, &matchlen,
&addr, &port);
@@ -1193,13 +1198,13 @@ static const struct sip_handler sip_handlers[] = {
SIP_HANDLER("REGISTER", process_register_request, process_register_response),
};
-static int process_sip_response(struct sk_buff *skb,
+static int process_sip_response(struct sk_buff *skb, unsigned int dataoff,
const char **dptr, unsigned int *datalen)
{
enum ip_conntrack_info ctinfo;
struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
- unsigned int matchoff, matchlen;
- unsigned int code, cseq, dataoff, i;
+ unsigned int matchoff, matchlen, matchend;
+ unsigned int code, cseq, i;
if (*datalen < strlen("SIP/2.0 200"))
return NF_ACCEPT;
@@ -1213,7 +1218,7 @@ static int process_sip_response(struct sk_buff *skb,
cseq = simple_strtoul(*dptr + matchoff, NULL, 10);
if (!cseq)
return NF_DROP;
- dataoff = matchoff + matchlen + 1;
+ matchend = matchoff + matchlen + 1;
for (i = 0; i < ARRAY_SIZE(sip_handlers); i++) {
const struct sip_handler *handler;
@@ -1221,15 +1226,16 @@ static int process_sip_response(struct sk_buff *skb,
handler = &sip_handlers[i];
if (handler->response == NULL)
continue;
- if (*datalen < dataoff + handler->len ||
- strnicmp(*dptr + dataoff, handler->method, handler->len))
+ if (*datalen < matchend + handler->len ||
+ strnicmp(*dptr + matchend, handler->method, handler->len))
continue;
- return handler->response(skb, dptr, datalen, cseq, code);
+ return handler->response(skb, dataoff, dptr, datalen,
+ cseq, code);
}
return NF_ACCEPT;
}
-static int process_sip_request(struct sk_buff *skb,
+static int process_sip_request(struct sk_buff *skb, unsigned int dataoff,
const char **dptr, unsigned int *datalen)
{
enum ip_conntrack_info ctinfo;
@@ -1254,7 +1260,7 @@ static int process_sip_request(struct sk_buff *skb,
if (!cseq)
return NF_DROP;
- return handler->request(skb, dptr, datalen, cseq);
+ return handler->request(skb, dataoff, dptr, datalen, cseq);
}
return NF_ACCEPT;
}
@@ -1288,13 +1294,13 @@ static int sip_help(struct sk_buff *skb,
return NF_ACCEPT;
if (strnicmp(dptr, "SIP/2.0 ", strlen("SIP/2.0 ")) != 0)
- ret = process_sip_request(skb, &dptr, &datalen);
+ ret = process_sip_request(skb, dataoff, &dptr, &datalen);
else
- ret = process_sip_response(skb, &dptr, &datalen);
+ ret = process_sip_response(skb, dataoff, &dptr, &datalen);
if (ret == NF_ACCEPT && ct->status & IPS_NAT_MASK) {
nf_nat_sip = rcu_dereference(nf_nat_sip_hook);
- if (nf_nat_sip && !nf_nat_sip(skb, &dptr, &datalen))
+ if (nf_nat_sip && !nf_nat_sip(skb, dataoff, &dptr, &datalen))
ret = NF_DROP;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.