diff options
Diffstat (limited to 'net/netfilter')
-rw-r--r-- | net/netfilter/nf_conntrack_sip.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c index 2fd1ea2..715ce54 100644 --- a/net/netfilter/nf_conntrack_sip.c +++ b/net/netfilter/nf_conntrack_sip.c @@ -130,6 +130,44 @@ static int digits_len(const struct nf_conn *ct, const char *dptr, return len; } +static int iswordc(const char c) +{ + if (isalnum(c) || c == '!' || c == '"' || c == '%' || + (c >= '(' && c <= '/') || c == ':' || c == '<' || c == '>' || + c == '?' || (c >= '[' && c <= ']') || c == '_' || c == '`' || + c == '{' || c == '}' || c == '~') + return 1; + return 0; +} + +static int word_len(const char *dptr, const char *limit) +{ + int len = 0; + while (dptr < limit && iswordc(*dptr)) { + dptr++; + len++; + } + return len; +} + +static int callid_len(const struct nf_conn *ct, const char *dptr, + const char *limit, int *shift) +{ + int len, domain_len; + + len = word_len(dptr, limit); + dptr += len; + if (!len || dptr == limit || *dptr != '@') + return len; + dptr++; + len++; + + domain_len = word_len(dptr, limit); + if (!domain_len) + return 0; + return len + domain_len; +} + /* get media type + port length */ static int media_len(const struct nf_conn *ct, const char *dptr, const char *limit, int *shift) @@ -299,6 +337,7 @@ static const struct sip_header ct_sip_hdrs[] = { [SIP_HDR_VIA_TCP] = SIP_HDR("Via", "v", "TCP ", epaddr_len), [SIP_HDR_EXPIRES] = SIP_HDR("Expires", NULL, NULL, digits_len), [SIP_HDR_CONTENT_LENGTH] = SIP_HDR("Content-Length", "l", NULL, digits_len), + [SIP_HDR_CALL_ID] = SIP_HDR("Call-Id", "i", NULL, callid_len), }; static const char *sip_follow_continuation(const char *dptr, const char *limit) |