version 1.1.2.5, 2013/06/24 14:48:04
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version 1.1.2.7, 2013/06/25 08:45:50
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Line 172 io_etherOpen(const char *csIface, int flags, int whdr,
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Line 172 io_etherOpen(const char *csIface, int flags, int whdr,
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return eth; |
return eth; |
} |
} |
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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 ssize_t |
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nextZCbuf(void ** __restrict zcache, struct bpf_zbuf * __restrict zbuf, |
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const void * __restrict buf) |
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{ |
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ssize_t rlen = -1; |
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struct bpf_zbuf_header *bzh; |
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if (!*zcache || *zcache == zbuf->bz_bufb) { |
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bzh = (struct bpf_zbuf_header *) zbuf->bz_bufa; |
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if (bzh->bzh_user_gen != atomic_load_acq_int(&bzh->bzh_kernel_gen)) { |
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rlen = atomic_load_acq_int(&bzh->bzh_kernel_len); |
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*zcache = zbuf->bz_bufa; |
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if (buf) |
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buf = ((caddr_t) *zcache) + sizeof(struct bpf_zbuf_header); |
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} |
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} else if (*zcache == zbuf->bz_bufa) { |
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bzh = (struct bpf_zbuf_header *) zbuf->bz_bufb; |
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if (bzh->bzh_user_gen != atomic_load_acq_int(&bzh->bzh_kernel_gen)) { |
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rlen = atomic_load_acq_int(&bzh->bzh_kernel_len); |
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*zcache = zbuf->bz_bufb; |
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if (buf) |
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buf = ((caddr_t) *zcache) + sizeof(struct bpf_zbuf_header); |
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} |
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} |
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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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void **zcache = NULL; |
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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(zcache, (struct bpf_zbuf*) zcbuf, buf); |
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#else |
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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; |
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} |