It's not really a complete tab, but it will get you started. 

I don't actually own or play bass, so this is all pretty much guess work.
Hopefully someone with a bass can finish the tab off.

This is the main riff on the ska part. 

The first verse is pretty much this all the way through.
The second verse has little variations that can be improvised.

G||---------------------------|---------------------------|
D||---------------------------|---------------------------|
A||--5---5-------5---5-5h7p5--|--------2---2-3---3-3h2h3--|
E||--------5---5--------------|--3---3--------------------|



The heavier bit
                                                x2
                            "I "
G||------------------------|-----------------------|
D||------------------------|-----------------------|
A||--------5----------5----|--------5----3---------|
E||--x-x--------x-x--------|--x-x-------------3----|

                                                x2
G||------------------------|-----------------------|
D||------------------------|-----------------------|
A||--3/4---5----3/4---5----|--3/4---5----3---------|
E||------------------------|------------------3----|


The end bit is just this repeated
G||------------------------|------------------------|
D||------------------------|------------------------|
A||--5---4---3--5---4---3--|--5---4---3--5---4---3--|
E||------------------------|------------------------|