diff options
| -rw-r--r-- | net/ipv4/netfilter/nf_nat_sip.c | 38 |
1 files changed, 25 insertions, 13 deletions
diff --git a/net/ipv4/netfilter/nf_nat_sip.c b/net/ipv4/netfilter/nf_nat_sip.c index 4334d5cabc5b..14544320c545 100644 --- a/net/ipv4/netfilter/nf_nat_sip.c +++ b/net/ipv4/netfilter/nf_nat_sip.c @@ -318,11 +318,11 @@ static int mangle_content_len(struct sk_buff *skb, buffer, buflen); } -static unsigned mangle_sdp_packet(struct sk_buff *skb, const char **dptr, - unsigned int dataoff, unsigned int *datalen, - enum sdp_header_types type, - enum sdp_header_types term, - char *buffer, int buflen) +static int mangle_sdp_packet(struct sk_buff *skb, const char **dptr, + unsigned int dataoff, unsigned int *datalen, + enum sdp_header_types type, + enum sdp_header_types term, + char *buffer, int buflen) { enum ip_conntrack_info ctinfo; struct nf_conn *ct = nf_ct_get(skb, &ctinfo); @@ -330,9 +330,9 @@ static unsigned mangle_sdp_packet(struct sk_buff *skb, const char **dptr, if (ct_sip_get_sdp_header(ct, *dptr, dataoff, *datalen, type, term, &matchoff, &matchlen) <= 0) - return 0; + return -ENOENT; return mangle_packet(skb, dptr, datalen, matchoff, matchlen, - buffer, buflen); + buffer, buflen) ? 0 : -EINVAL; } static unsigned int ip_nat_sdp_addr(struct sk_buff *skb, const char **dptr, @@ -346,8 +346,8 @@ static unsigned int ip_nat_sdp_addr(struct sk_buff *skb, const char **dptr, unsigned int buflen; buflen = sprintf(buffer, NIPQUAD_FMT, NIPQUAD(addr->ip)); - if (!mangle_sdp_packet(skb, dptr, dataoff, datalen, type, term, - buffer, buflen)) + if (mangle_sdp_packet(skb, dptr, dataoff, datalen, type, term, + buffer, buflen)) return 0; return mangle_content_len(skb, dptr, datalen); @@ -381,15 +381,27 @@ static unsigned int ip_nat_sdp_session(struct sk_buff *skb, const char **dptr, /* Mangle session description owner and contact addresses */ buflen = sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(addr->ip)); - if (!mangle_sdp_packet(skb, dptr, dataoff, datalen, + if (mangle_sdp_packet(skb, dptr, dataoff, datalen, SDP_HDR_OWNER_IP4, SDP_HDR_MEDIA, buffer, buflen)) return 0; - if (!mangle_sdp_packet(skb, dptr, dataoff, datalen, - SDP_HDR_CONNECTION_IP4, SDP_HDR_MEDIA, - buffer, buflen)) + switch (mangle_sdp_packet(skb, dptr, dataoff, datalen, + SDP_HDR_CONNECTION_IP4, SDP_HDR_MEDIA, + buffer, buflen)) { + case 0: + /* + * RFC 2327: + * + * Session description + * + * c=* (connection information - not required if included in all media) + */ + case -ENOENT: + break; + default: return 0; + } return mangle_content_len(skb, dptr, datalen); } |