>+       if (mtod(m, intptr_t) & 0x3) {
>+               intptr_t i = mtod(m, intptr_t) & 0x3;
>+               bcopy(m->m_data, m->m_data - i, m->m_len);

Since the arguments overlap, that should be ovbcopy.

>+               m->m_data -= i;
>+       }
>         ip = mtod(m, struct ip *);

-- 
Matt Thomas               Internet:   matt@3am-software.com
3am Software Foundry      WWW URL:    http://www.3am-software.com/bio/matt/
Cupertino, CA             Disclaimer: I avow all knowledge of this message