1 #define KMSG_COMPONENT "IPVS"
2 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
4 #include <linux/module.h>
5 #include <linux/kernel.h>
8 #include <net/netfilter/nf_conntrack.h>
9 #include <linux/netfilter/nf_conntrack_sip.h>
11 #ifdef CONFIG_IP_VS_DEBUG
12 static const char *ip_vs_dbg_callid(char *buf, size_t buf_len,
13 const char *callid, size_t callid_len,
16 size_t len = min(min(callid_len, (size_t)64), buf_len - *idx - 1);
17 memcpy(buf + *idx, callid, len);
20 return buf + *idx - len;
23 #define IP_VS_DEBUG_CALLID(callid, len) \
24 ip_vs_dbg_callid(ip_vs_dbg_buf, sizeof(ip_vs_dbg_buf), \
25 callid, len, &ip_vs_dbg_idx)
28 static int get_callid(const char *dptr, unsigned int dataoff,
30 unsigned int *matchoff, unsigned int *matchlen)
34 int ret = ct_sip_get_header(NULL, dptr, dataoff, datalen,
35 SIP_HDR_CALL_ID, matchoff,
44 /* Too large is useless */
45 if (*matchlen > IP_VS_PEDATA_MAXLEN)
48 /* SIP headers are always followed by a line terminator */
49 if (*matchoff + *matchlen == datalen)
52 /* RFC 2543 allows lines to be terminated with CR, LF or CRLF,
53 * RFC 3261 allows only CRLF, we support both. */
54 if (*(dptr + *matchoff + *matchlen) != '\r' &&
55 *(dptr + *matchoff + *matchlen) != '\n')
58 IP_VS_DBG_BUF(9, "SIP callid %s (%d bytes)\n",
59 IP_VS_DEBUG_CALLID(dptr + *matchoff, *matchlen),
65 ip_vs_sip_fill_param(struct ip_vs_conn_param *p, struct sk_buff *skb)
67 struct ip_vs_iphdr iph;
68 unsigned int dataoff, datalen, matchoff, matchlen;
72 ip_vs_fill_iphdr(p->af, skb_network_header(skb), &iph);
74 /* Only useful with UDP */
75 if (iph.protocol != IPPROTO_UDP)
79 dataoff = iph.len + sizeof(struct udphdr);
80 if (dataoff >= skb->len)
83 if ((retc=skb_linearize(skb)) < 0)
85 dptr = skb->data + dataoff;
86 datalen = skb->len - dataoff;
88 if (get_callid(dptr, 0, datalen, &matchoff, &matchlen))
91 /* N.B: pe_data is only set on success,
92 * this allows fallback to the default persistence logic on failure
94 p->pe_data = kmemdup(dptr + matchoff, matchlen, GFP_ATOMIC);
98 p->pe_data_len = matchlen;
103 static bool ip_vs_sip_ct_match(const struct ip_vs_conn_param *p,
104 struct ip_vs_conn *ct)
109 if (ct->af == p->af &&
110 ip_vs_addr_equal(p->af, p->caddr, &ct->caddr) &&
111 /* protocol should only be IPPROTO_IP if
112 * d_addr is a fwmark */
113 ip_vs_addr_equal(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af,
114 p->vaddr, &ct->vaddr) &&
115 ct->vport == p->vport &&
116 ct->flags & IP_VS_CONN_F_TEMPLATE &&
117 ct->protocol == p->protocol &&
118 ct->pe_data && ct->pe_data_len == p->pe_data_len &&
119 !memcmp(ct->pe_data, p->pe_data, p->pe_data_len))
122 IP_VS_DBG_BUF(9, "SIP template match %s %s->%s:%d %s\n",
123 ip_vs_proto_name(p->protocol),
124 IP_VS_DEBUG_CALLID(p->pe_data, p->pe_data_len),
125 IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport),
126 ret ? "hit" : "not hit");
131 static u32 ip_vs_sip_hashkey_raw(const struct ip_vs_conn_param *p,
132 u32 initval, bool inverse)
134 return jhash(p->pe_data, p->pe_data_len, initval);
137 static int ip_vs_sip_show_pe_data(const struct ip_vs_conn *cp, char *buf)
139 memcpy(buf, cp->pe_data, cp->pe_data_len);
140 return cp->pe_data_len;
143 static struct ip_vs_pe ip_vs_sip_pe =
146 .refcnt = ATOMIC_INIT(0),
147 .module = THIS_MODULE,
148 .n_list = LIST_HEAD_INIT(ip_vs_sip_pe.n_list),
149 .fill_param = ip_vs_sip_fill_param,
150 .ct_match = ip_vs_sip_ct_match,
151 .hashkey_raw = ip_vs_sip_hashkey_raw,
152 .show_pe_data = ip_vs_sip_show_pe_data,
155 static int __init ip_vs_sip_init(void)
157 return register_ip_vs_pe(&ip_vs_sip_pe);
160 static void __exit ip_vs_sip_cleanup(void)
162 unregister_ip_vs_pe(&ip_vs_sip_pe);
165 module_init(ip_vs_sip_init);
166 module_exit(ip_vs_sip_cleanup);
167 MODULE_LICENSE("GPL");