version 1.1.2.2, 2013/06/24 11:09:55
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version 1.1.2.20, 2013/06/26 16:34:28
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Line 26 io_get1stiface(char *szIface, int iflen)
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Line 26 io_get1stiface(char *szIface, int iflen)
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* io_etherClose() - Close BPF interface |
* io_etherClose() - Close BPF interface |
* |
* |
* @eth = bpf handle |
* @eth = bpf handle |
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* @zcbuf = zero copy buffer, if BPF supports it and isn't NULL |
* return: none |
* return: none |
*/ |
*/ |
void |
void |
io_etherClose(int eth) | io_etherClose(int eth, void **zcbuf) |
{ |
{ |
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#ifdef __FreeBSD__ |
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struct bpf_zbuf *zbuf = NULL; |
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#endif |
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if (eth > STDERR_FILENO) |
if (eth > STDERR_FILENO) |
close(eth); |
close(eth); |
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if (zcbuf && *zcbuf) { |
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#ifdef __FreeBSD__ |
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zbuf = *zcbuf; |
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munmap(zbuf->bz_bufb, zbuf->bz_buflen); |
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munmap(zbuf->bz_bufa, zbuf->bz_buflen); |
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e_free(*zcbuf); |
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*zcbuf = NULL; |
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#endif |
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} |
} |
} |
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#ifdef __FreeBSD__ |
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static inline struct bpf_zbuf * |
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allocZCbuf(u_int len) |
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{ |
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struct bpf_zbuf *zbuf = NULL; |
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zbuf = e_malloc(sizeof(struct bpf_zbuf)); |
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if (!zbuf) { |
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io_SetErr(elwix_GetErrno(), "%s", elwix_GetError()); |
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return NULL; |
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} else |
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memset(zbuf, 0, sizeof(struct bpf_zbuf)); |
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zbuf->bz_buflen = roundup(len, getpagesize()); |
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zbuf->bz_bufa = mmap(NULL, zbuf->bz_buflen, PROT_READ | PROT_WRITE, MAP_ANON, -1, 0); |
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if (zbuf->bz_bufa == MAP_FAILED) { |
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LOGERR; |
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e_free(zbuf); |
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return NULL; |
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} else |
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memset(zbuf->bz_bufa, 0, zbuf->bz_buflen); |
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zbuf->bz_bufb = mmap(NULL, zbuf->bz_buflen, PROT_READ | PROT_WRITE, MAP_ANON, -1, 0); |
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if (zbuf->bz_bufb == MAP_FAILED) { |
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LOGERR; |
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munmap(zbuf->bz_bufa, zbuf->bz_buflen); |
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e_free(zbuf); |
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return NULL; |
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} else |
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memset(zbuf->bz_bufb, 0, zbuf->bz_buflen); |
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return zbuf; |
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} |
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#endif |
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/* |
/* |
* io_etherOpen() - Open BPF interface to device |
* io_etherOpen() - Open BPF interface to device |
* |
* |
* @csIface = interface name |
* @csIface = interface name |
* @flags = open flags |
* @flags = open flags |
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* @whdr = with complete headers |
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* @buflen = buffer length |
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* @zcbuf = zero copy buffer, if BPF supports it and isn't NULL |
* return: -1 error or >-1 bpf handle |
* return: -1 error or >-1 bpf handle |
*/ |
*/ |
int |
int |
io_etherOpen(const char *csIface, int flags) | io_etherOpen(const char *csIface, int flags, int whdr, u_int *buflen, void **zcbuf) |
{ |
{ |
int n = 1, eth = -1; | int eth = -1; |
register int i; |
register int i; |
char szStr[STRSIZ]; |
char szStr[STRSIZ]; |
struct ifreq ifr; |
struct ifreq ifr; |
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u_int n = 1; |
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#ifndef __FreeBSD__ |
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if (zcbuf) { |
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io_SetErr(ENOTSUP, "bpf zero copy buffer mode is not supported"); |
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return -1; |
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} |
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#endif |
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for (i = 0; i < BPF_DEV_MAX; i++) { |
for (i = 0; i < BPF_DEV_MAX; i++) { |
memset(szStr, 0, sizeof szStr); |
memset(szStr, 0, sizeof szStr); |
snprintf(szStr, sizeof szStr, "/dev/bpf%d", i); |
snprintf(szStr, sizeof szStr, "/dev/bpf%d", i); |
Line 62 io_etherOpen(const char *csIface, int flags)
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Line 122 io_etherOpen(const char *csIface, int flags)
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return -1; |
return -1; |
} |
} |
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if (ioctl(eth, BIOCIMMEDIATE, &n) == -1) { | if (!zcbuf) { |
LOGERR; | if (ioctl(eth, BIOCGBLEN, &n) == -1) { |
close(eth); | LOGERR; |
return -1; | close(eth); |
| return -1; |
| } else |
| n = (buflen && *buflen) ? *buflen : n; |
| if (ioctl(eth, BIOCSBLEN, &n) == -1) { |
| LOGERR; |
| close(eth); |
| return -1; |
| } |
| if (buflen && *buflen) |
| *buflen = n; |
| } else { |
| #ifdef __FreeBSD__ |
| n = BPF_BUFMODE_ZBUF; |
| if (ioctl(eth, BIOCSETBUFMODE, &n) == -1) { |
| LOGERR; |
| close(eth); |
| return -1; |
| } |
| if (ioctl(eth, BIOCGETZMAX, &n) == -1) { |
| LOGERR; |
| close(eth); |
| return -1; |
| } else |
| n = (buflen && *buflen) ? *buflen : n; |
| if (!(*zcbuf = allocZCbuf(n))) { |
| close(eth); |
| return -1; |
| } |
| if (ioctl(eth, BIOCSETZBUF, *zcbuf) == -1) { |
| LOGERR; |
| io_etherClose(eth, zcbuf); |
| return -1; |
| } |
| if (buflen && *buflen) |
| *buflen = n; |
| #endif |
} |
} |
n = USHRT_MAX + 1; | |
if (ioctl(eth, BIOCSBLEN, &n) == -1) { | |
LOGERR; | |
close(eth); | |
return -1; | |
} | |
if (csIface) |
if (csIface) |
strlcpy(szStr, csIface, sizeof szStr); |
strlcpy(szStr, csIface, sizeof szStr); |
else if (io_get1stiface(szStr, sizeof szStr) == -1) { |
else if (io_get1stiface(szStr, sizeof szStr) == -1) { |
close(eth); | io_etherClose(eth, zcbuf); |
return -1; |
return -1; |
} |
} |
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memset(&ifr, 0, sizeof ifr); |
strlcpy(ifr.ifr_name, szStr, sizeof ifr.ifr_name); |
strlcpy(ifr.ifr_name, szStr, sizeof ifr.ifr_name); |
if (ioctl(eth, BIOCSETIF, &ifr) == -1) { |
if (ioctl(eth, BIOCSETIF, &ifr) == -1) { |
LOGERR; |
LOGERR; |
close(eth); | io_etherClose(eth, zcbuf); |
return -1; |
return -1; |
} |
} |
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n = 1; |
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if (whdr && ioctl(eth, BIOCSHDRCMPLT, &n) == -1) { |
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LOGERR; |
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io_etherClose(eth, zcbuf); |
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return -1; |
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} |
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if (ioctl(eth, BIOCIMMEDIATE, &n) == -1) { |
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LOGERR; |
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io_etherClose(eth, zcbuf); |
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return -1; |
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} |
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return eth; |
return eth; |
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} |
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/* |
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* io_etherSend() - Send packet to bpf |
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* |
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* @eth = bpf handle |
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* @buf = buffer |
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* @buflen = buffer length |
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* return: -1 error or !=-1 written bytes |
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*/ |
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ssize_t |
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io_etherSend(int eth, const void *buf, size_t buflen) |
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{ |
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ssize_t wlen = 0; |
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if (!buf || !buflen) { |
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io_SetErr(EINVAL, "invalid arguments"); |
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return -1; |
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} |
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wlen = write(eth, buf, buflen); |
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if (wlen == -1) |
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LOGERR; |
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return wlen; |
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} |
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#ifdef __FreeBSD__ |
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static inline void |
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ackZCbuf(struct bpf_zbuf_header *bzh) |
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{ |
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atomic_store_rel_int(&bzh->bzh_user_gen, bzh->bzh_kernel_gen); |
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} |
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static inline int |
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chkZCbuf(struct bpf_zbuf_header *bzh) |
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{ |
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/* return true if userspace owns buffer, and false otherwise. */ |
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return (bzh->bzh_user_gen != atomic_load_acq_int(&bzh->bzh_kernel_gen)); |
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} |
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static ssize_t |
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nextZCbuf(int eth, struct bpf_zbuf * __restrict zbuf, void * __restrict buf, size_t buflen) |
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{ |
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ssize_t rlen = 0; |
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struct bpf_zbuf bz; |
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struct bpf_zbuf_header *bzh; |
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off_t pos = 0; |
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bzh = (struct bpf_zbuf_header *) zbuf->bz_bufa; |
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if (chkZCbuf(bzh)) { |
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rlen = MIN(atomic_load_acq_int(&bzh->bzh_kernel_len), buflen); |
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memcpy(buf + pos, zbuf->bz_bufa + sizeof(struct bpf_zbuf_header), rlen); |
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ackZCbuf(bzh); |
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pos += rlen; |
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} |
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bzh = (struct bpf_zbuf_header *) zbuf->bz_bufb; |
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if (chkZCbuf(bzh)) { |
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rlen = MIN(atomic_load_acq_int(&bzh->bzh_kernel_len), buflen); |
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memcpy(buf + pos, zbuf->bz_bufb + sizeof(struct bpf_zbuf_header), rlen); |
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ackZCbuf(bzh); |
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pos += rlen; |
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} |
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if (!pos) { |
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if ((rlen = ioctl(eth, BIOCROTZBUF, &bz)) == -1) |
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LOGERR; |
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} else |
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rlen = pos; |
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return rlen; |
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} |
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#endif |
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/* |
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* io_etherRecv() - Receive packet from bpf |
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* |
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* @eth = bpf handle |
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* @buf = buffer |
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* @buflen = buffer length |
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* @zcbuf = zero copy buffer, if BPF supports it and isn't NULL |
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* return: -1 error or !=-1 readed bytes |
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*/ |
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ssize_t |
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io_etherRecv(int eth, void * __restrict buf, size_t buflen, void * __restrict zcbuf) |
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{ |
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ssize_t rlen = 0; |
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if (!buf || !buflen) { |
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io_SetErr(EINVAL, "invalid arguments"); |
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return -1; |
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} |
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if (!zcbuf) { |
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rlen = read(eth, buf, buflen); |
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if (rlen == -1) |
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LOGERR; |
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} else { |
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#ifdef __FreeBSD__ |
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rlen = nextZCbuf(eth, (struct bpf_zbuf*) zcbuf, buf, buflen); |
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if (!rlen) |
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rlen = nextZCbuf(eth, (struct bpf_zbuf*) zcbuf, buf, buflen); |
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#else |
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rlen = -1; |
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io_SetErr(ENOTSUP, "bpf zero copy buffer mode is not supported"); |
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#endif |
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} |
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return rlen; |
} |
} |