| tcpmss.c (131265) | tcpmss.c (134789) |
|---|---|
| 1/*- 2 * Copyright (c) 2000 Ruslan Ermilov and Brian Somers <brian@Awfulhak.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 9 unchanged lines hidden (view full) --- 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * | 1/*- 2 * Copyright (c) 2000 Ruslan Ermilov and Brian Somers <brian@Awfulhak.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 9 unchanged lines hidden (view full) --- 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * |
| 26 * $FreeBSD: head/usr.sbin/ppp/tcpmss.c 131265 2004-06-29 07:40:38Z brian $ | 26 * $FreeBSD: head/usr.sbin/ppp/tcpmss.c 134789 2004-09-05 01:46:52Z brian $ |
| 27 */ 28 29#include <sys/param.h> 30 31#include <sys/socket.h> 32#include <net/route.h> 33#include <netinet/in_systm.h> 34#include <netinet/in.h> --- 56 unchanged lines hidden (view full) --- 91 } else { \ 92 acc = (acc >> 16) + (acc & 0xffff); \ 93 acc += acc >> 16; \ 94 cksum = (u_short) acc; \ 95 } \ 96} 97 98static void | 27 */ 28 29#include <sys/param.h> 30 31#include <sys/socket.h> 32#include <net/route.h> 33#include <netinet/in_systm.h> 34#include <netinet/in.h> --- 56 unchanged lines hidden (view full) --- 91 } else { \ 92 acc = (acc >> 16) + (acc & 0xffff); \ 93 acc += acc >> 16; \ 94 cksum = (u_short) acc; \ 95 } \ 96} 97 98static void |
| 99MSSFixup(struct tcphdr *tc, ssize_t pktlen, u_int16_t maxmss) | 99MSSFixup(struct tcphdr *tc, size_t pktlen, u_int16_t maxmss) |
| 100{ | 100{ |
| 101 int hlen, olen, optlen; | 101 size_t hlen, olen, optlen; |
| 102 u_char *opt; 103 u_int16_t *mss; 104 int accumulate; 105 106 hlen = tc->th_off << 2; 107 108 /* Invalid header length or header without options. */ 109 if (hlen <= sizeof(struct tcphdr) || hlen > pktlen) --- 29 unchanged lines hidden (view full) --- 139 } 140 } 141} 142 143static struct mbuf * 144tcpmss_Check(struct bundle *bundle, struct mbuf *bp) 145{ 146 struct ip *pip; | 102 u_char *opt; 103 u_int16_t *mss; 104 int accumulate; 105 106 hlen = tc->th_off << 2; 107 108 /* Invalid header length or header without options. */ 109 if (hlen <= sizeof(struct tcphdr) || hlen > pktlen) --- 29 unchanged lines hidden (view full) --- 139 } 140 } 141} 142 143static struct mbuf * 144tcpmss_Check(struct bundle *bundle, struct mbuf *bp) 145{ 146 struct ip *pip; |
| 147 int hlen, plen; | 147 size_t hlen, plen; |
| 148 149 if (!Enabled(bundle, OPT_TCPMSSFIXUP)) 150 return bp; 151 152 bp = m_pullup(bp); 153 plen = m_length(bp); 154 pip = (struct ip *)MBUF_CTOP(bp); 155 hlen = pip->ip_hl << 2; 156 157 /* 158 * Check for MSS option only for TCP packets with zero fragment offsets 159 * and correct total and header lengths. 160 */ 161 if (pip->ip_p == IPPROTO_TCP && (ntohs(pip->ip_off) & IP_OFFMASK) == 0 && 162 ntohs(pip->ip_len) == plen && hlen <= plen && | 148 149 if (!Enabled(bundle, OPT_TCPMSSFIXUP)) 150 return bp; 151 152 bp = m_pullup(bp); 153 plen = m_length(bp); 154 pip = (struct ip *)MBUF_CTOP(bp); 155 hlen = pip->ip_hl << 2; 156 157 /* 158 * Check for MSS option only for TCP packets with zero fragment offsets 159 * and correct total and header lengths. 160 */ 161 if (pip->ip_p == IPPROTO_TCP && (ntohs(pip->ip_off) & IP_OFFMASK) == 0 && 162 ntohs(pip->ip_len) == plen && hlen <= plen && |
| 163 plen - hlen >= sizeof(struct tcphdr)) | 163 plen >= sizeof(struct tcphdr) + hlen) |
| 164 MSSFixup((struct tcphdr *)(MBUF_CTOP(bp) + hlen), plen - hlen, 165 MAXMSS(bundle->iface->mtu)); 166 167 return bp; 168} 169 170static struct mbuf * | 164 MSSFixup((struct tcphdr *)(MBUF_CTOP(bp) + hlen), plen - hlen, 165 MAXMSS(bundle->iface->mtu)); 166 167 return bp; 168} 169 170static struct mbuf * |
| 171tcpmss_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp, 172 int pri, u_short *proto) | 171tcpmss_LayerPush(struct bundle *bundle, struct link *l __unused, 172 struct mbuf *bp, int pri __unused, u_short *proto __unused) |
| 173{ 174 return tcpmss_Check(bundle, bp); 175} 176 177static struct mbuf * | 173{ 174 return tcpmss_Check(bundle, bp); 175} 176 177static struct mbuf * |
| 178tcpmss_LayerPull(struct bundle *bundle, struct link *l, struct mbuf *bp, 179 u_short *proto) | 178tcpmss_LayerPull(struct bundle *bundle, struct link *l __unused, 179 struct mbuf *bp, u_short *proto __unused) |
| 180{ 181 return tcpmss_Check(bundle, bp); 182} 183 184struct layer tcpmsslayer = 185 { LAYER_PROTO, "tcpmss", tcpmss_LayerPush, tcpmss_LayerPull }; | 180{ 181 return tcpmss_Check(bundle, bp); 182} 183 184struct layer tcpmsslayer = 185 { LAYER_PROTO, "tcpmss", tcpmss_LayerPush, tcpmss_LayerPull }; |