ng_tcpmss.c File Reference

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/endian.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netgraph/ng_tcpmss.h>

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Go to the source code of this file.

Data Structures
struct	hpriv_p

Macros
#define	ERROUT(x)   { error = (x); goto done; }
#define	M_CHECK(length)
#define	TCPMSS_ADJUST_CHECKSUM(acc, cksum)

Functions
static int	correct_mss (struct tcphdr *, int, uint16_t, int)
	NETGRAPH_INIT (tcpmss, &ng_tcpmss_typestruct)
static int	ng_tcpmss_constructor (node_p node)
static int	ng_tcpmss_newhook (node_p node, hook_p hook, const char *name)
static int	ng_tcpmss_rcvmsg (node_p node, item_p item, hook_p lasthook)
static int	ng_tcpmss_rcvdata (hook_p hook, item_p item)
static int	ng_tcpmss_disconnect (hook_p hook)

Variables
static ng_constructor_t	ng_tcpmss_constructor
static ng_rcvmsg_t	ng_tcpmss_rcvmsg
static ng_newhook_t	ng_tcpmss_newhook
static ng_rcvdata_t	ng_tcpmss_rcvdata
static ng_disconnect_t	ng_tcpmss_disconnect
static const struct ng_parse_struct_field	ng_tcpmss_hookstat_type_fields [] = NG_TCPMSS_HOOKSTAT_INFO
static const struct ng_parse_type	ng_tcpmss_hookstat_type
static const struct ng_parse_struct_field	ng_tcpmss_config_type_fields [] = NG_TCPMSS_CONFIG_INFO
static const struct ng_parse_type	ng_tcpmss_config_type
static const struct ng_cmdlist	ng_tcpmss_cmds []
static struct ng_type	ng_tcpmss_typestruct

Macro Definition Documentation

ERROUT

#define ERROUT

(

x

)

{ error = (x); goto done; }

Definition at line 145 of file ng_tcpmss.c.

M_CHECK

#define M_CHECK

(

length

)

Value:

        do {                                    \
        pullup_len += length;                                   \
        if ((m)->m_pkthdr.len < pullup_len)                     \
                goto send;                                      \
        if ((m)->m_len < pullup_len &&                          \
           (((m) = m_pullup((m), pullup_len)) == NULL))         \
                ERROUT(ENOBUFS);                                \
        } while (0)

TCPMSS_ADJUST_CHECKSUM

#define TCPMSS_ADJUST_CHECKSUM	(		acc,
			cksum
	)

Value:

        do {            \
        acc += cksum;                                   \
        if (acc < 0) {                                  \
                acc = -acc;                             \
                acc = (acc >> 16) + (acc & 0xffff);     \
                acc += acc >> 16;                       \
                cksum = (u_short) ~acc;                 \
        } else {                                        \
                acc = (acc >> 16) + (acc & 0xffff);     \
                acc += acc >> 16;                       \
                cksum = (u_short) acc;                  \
        }                                               \
} while (0);

Definition at line 396 of file ng_tcpmss.c.

Function Documentation

correct_mss()

static int correct_mss ( struct tcphdr *  tc, int  hlen, uint16_t  maxmss, int  flags  )

static

Definition at line 411 of file ng_tcpmss.c.

References flags, and TCPMSS_ADJUST_CHECKSUM.

Referenced by ng_tcpmss_rcvdata().

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NETGRAPH_INIT()

NETGRAPH_INIT	(	tcpmss	,
		&	ng_tcpmss_typestruct
	)

ng_tcpmss_constructor()

static int ng_tcpmss_constructor ( node_p  node )

static

Definition at line 151 of file ng_tcpmss.c.

ng_tcpmss_disconnect()

static int ng_tcpmss_disconnect ( hook_p  hook )

static

Definition at line 364 of file ng_tcpmss.c.

References NG_HOOK_NODE, NG_HOOK_PRIVATE, NG_NODE_NUMHOOKS, and ng_rmnode_self().

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ng_tcpmss_newhook()

static int ng_tcpmss_newhook ( node_p  node, hook_p  hook, const char *  name  )

static

Definition at line 160 of file ng_tcpmss.c.

References NG_HOOK_SET_PRIVATE.

ng_tcpmss_rcvdata()

static int ng_tcpmss_rcvdata ( hook_p  hook, item_p  item  )

static

Definition at line 267 of file ng_tcpmss.c.

References correct_mss(), ERROUT, M_CHECK, NG_FREE_ITEM, NG_FREE_M, NG_FWD_NEW_DATA, NG_HOOK_PRIVATE, NGI_GET_M, and priv::stats.

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ng_tcpmss_rcvmsg()

static int ng_tcpmss_rcvmsg ( node_p  node, item_p  item, hook_p  lasthook  )

static

Definition at line 177 of file ng_tcpmss.c.

References ng_mesg::ng_msghdr::arglen, ng_mesg::ng_msghdr::cmd, ng_mesg::data, ERROUT, ng_mesg::header, ng_tcpmss_config::inHook, ng_tcpmss_config::maxMSS, ng_findhook(), NG_FREE_MSG, NG_HOOK_PRIVATE, NG_HOOKSIZ, NG_MKRESPONSE, NG_RESPOND_MSG, NGI_GET_MSG, NGM_TCPMSS_CLR_STATS, NGM_TCPMSS_CONFIG, NGM_TCPMSS_COOKIE, NGM_TCPMSS_GET_STATS, NGM_TCPMSS_GETCLR_STATS, ng_tcpmss_config::outHook, priv::stats, and ng_mesg::ng_msghdr::typecookie.

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Variable Documentation

ng_tcpmss_cmds

const struct ng_cmdlist ng_tcpmss_cmds[]

static

Definition at line 100 of file ng_tcpmss.c.

ng_tcpmss_config_type

const struct ng_parse_type ng_tcpmss_config_type

static

Initial value:

= {
        &ng_parse_struct_type,
        ng_tcpmss_config_type_fields
}

Definition at line 94 of file ng_tcpmss.c.

ng_tcpmss_config_type_fields

const struct ng_parse_struct_field ng_tcpmss_config_type_fields[] = NG_TCPMSS_CONFIG_INFO

static

Definition at line 92 of file ng_tcpmss.c.

ng_tcpmss_constructor

ng_constructor_t ng_tcpmss_constructor

static

Definition at line 75 of file ng_tcpmss.c.

ng_tcpmss_disconnect

ng_disconnect_t ng_tcpmss_disconnect

static

Definition at line 79 of file ng_tcpmss.c.

ng_tcpmss_hookstat_type

const struct ng_parse_type ng_tcpmss_hookstat_type

static

Initial value:

= {
        &ng_parse_struct_type,
        &ng_tcpmss_hookstat_type_fields
}

Definition at line 86 of file ng_tcpmss.c.

ng_tcpmss_hookstat_type_fields

const struct ng_parse_struct_field ng_tcpmss_hookstat_type_fields[] = NG_TCPMSS_HOOKSTAT_INFO

static

Definition at line 84 of file ng_tcpmss.c.

ng_tcpmss_newhook

ng_newhook_t ng_tcpmss_newhook

static

Definition at line 77 of file ng_tcpmss.c.

ng_tcpmss_rcvdata

ng_rcvdata_t ng_tcpmss_rcvdata

static

Definition at line 78 of file ng_tcpmss.c.

ng_tcpmss_rcvmsg

ng_rcvmsg_t ng_tcpmss_rcvmsg

static

Definition at line 76 of file ng_tcpmss.c.

ng_tcpmss_typestruct

struct ng_type ng_tcpmss_typestruct

static

Initial value:

= {
        .version =      NG_ABI_VERSION,
        .name =         NG_TCPMSS_NODE_TYPE,
        .constructor =  ng_tcpmss_constructor,
        .rcvmsg =       ng_tcpmss_rcvmsg,
        .newhook =      ng_tcpmss_newhook,
        .rcvdata =      ng_tcpmss_rcvdata,
        .disconnect =   ng_tcpmss_disconnect,
        .cmdlist =      ng_tcpmss_cmds,
}

Definition at line 133 of file ng_tcpmss.c.