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Differential D46183 Diff 141631 sys/netpfil/ipfw/pmod/tcpmod.c

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sys/netpfil/ipfw/pmod/tcpmod.c

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#include <netinet/ip_fw.h> #include <netinet/ip_fw.h>
#include <netinet/ip6.h> #include <netinet/ip6.h>
#include <netpfil/ipfw/ip_fw_private.h> #include <netpfil/ipfw/ip_fw_private.h>
#include <netpfil/ipfw/pmod/pmod.h> #include <netpfil/ipfw/pmod/pmod.h>
#include <machine/in_cksum.h> #include <machine/in_cksum.h>
VNET_DEFINE_STATIC(uint16_t, tcpmod_setmss_eid) = 0; VNET_DEFINE_STATIC(uint32_t, tcpmod_setmss_eid) = 0;
#define V_tcpmod_setmss_eid VNET(tcpmod_setmss_eid) #define V_tcpmod_setmss_eid VNET(tcpmod_setmss_eid)
static int static int
tcpmod_setmss(struct mbuf **mp, struct tcphdr *tcp, int tlen, uint16_t mss) tcpmod_setmss(struct mbuf **mp, struct tcphdr *tcp, int tlen, uint16_t mss)
{ {
struct mbuf *m; struct mbuf *m;
u_char *cp; u_char *cp;
int optlen, ret; int optlen, ret;
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ipfw_tcpmod(struct ip_fw_chain *chain, struct ip_fw_args *args, ipfw_tcpmod(struct ip_fw_chain *chain, struct ip_fw_args *args,
ipfw_insn *cmd, int *done) ipfw_insn *cmd, int *done)
{ {
ipfw_insn *icmd; ipfw_insn *icmd;
int ret; int ret;
*done = 0; /* try next rule if not matched */ *done = 0; /* try next rule if not matched */
ret = IP_FW_DENY; ret = IP_FW_DENY;
icmd = cmd + 1; icmd = cmd + F_LEN(cmd);
if (cmd->opcode != O_EXTERNAL_ACTION || if (cmd->opcode != O_EXTERNAL_ACTION ||
cmd->arg1 != V_tcpmod_setmss_eid || insntod(cmd, kidx)->kidx != V_tcpmod_setmss_eid ||
icmd->opcode != O_EXTERNAL_DATA || icmd->opcode != O_EXTERNAL_DATA ||
icmd->len != F_INSN_SIZE(ipfw_insn)) icmd->len != F_INSN_SIZE(ipfw_insn))
return (ret); return (ret);
/* /*
* NOTE: ipfw_chk() can set f_id.proto from IPv6 fragment header, * NOTE: ipfw_chk() can set f_id.proto from IPv6 fragment header,
* but f_id._flags can be filled only from real TCP header. * but f_id._flags can be filled only from real TCP header.
* *
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